Full-prefabricated assembly type row steel pipe concrete structure

Abstract

The utility model relates to a fully prefabricated assembly type row concrete filled steel tube structure, an upper row concrete filled steel tube and a lower row concrete filled steel tube are both formed by arranging upper concrete filled steel tubes and lower concrete filled steel tubes in rows, the upper concrete filled steel tubes are provided with upper connecting sections, and the side walls of the upper connecting sections are provided with at least one annular inserting groove; the lower concrete filled steel tube is provided with a lower connecting section, and a plurality of inserting holes are formed in the side wall of the lower connecting section in the radial direction corresponding to the annular inserting grooves. The upper connecting section is inserted into the vertical inserting part, an annular gap is reserved between the upper connecting section and the lower connecting section, and the multiple inserting keys are matched with the multiple inserting holes and are inserted and fixed to the annular inserting groove through the inserting holes; grouting materials are poured into the annular gaps. Internal force is transmitted between the upper concrete-filled steel tube and the lower concrete-filled steel tube in an inserting key and anchoring connection mode, the defect that prefabricated concrete in the steel tubes is damaged by welding high heat is overcome, and the connection strength of the upper concrete-filled steel tube and the lower concrete-filled steel tube is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of building structures, in particular to a steel tube concrete structure, and specifically to a fully prefabricated assembled steel tube concrete structure. Background Art

[0002] The fully prefabricated steel tube concrete structure has low material consumption, good corrosion resistance, fire resistance, and ductility, and achieves good structural stress performance and seismic performance at a low engineering cost. It has low resource and energy consumption, green and environmentally friendly factory production, fast construction speed, simple connection, convenient construction, light component weight, and convenient transportation, hoisting and installation. It can be widely used in various residential, office, hotel, commercial and other multi-story, high-rise and super-high-rise buildings. It is a high-quality prefabricated industrialized building component.

[0003] The round steel tubes in the upper and lower components of the fully prefabricated and assembled steel tube concrete structure traditionally need to be connected by welding. However, since the concrete in the steel tube has been poured in the factory before welding, the high heat generated by welding at the construction site can easily damage the concrete in the steel tube. During the construction process, the welding heat needs to be strictly controlled to protect the concrete in the steel tube. Therefore, the traditional connection method is complex to construct and has high quality requirements.

[0004] The round steel tubes in the upper and lower components of the fully prefabricated steel tube concrete structure are traditionally connected by steel structure nodes. Bolt connection requires a large space and high production and installation accuracy, which is usually difficult to meet. Therefore, welding connection is currently the main method. However, welding connection still has the following disadvantages:

[0005] 1) Since the concrete in the steel pipe has been poured before welding, the high heat generated by welding can easily damage the concrete in the steel pipe. During the construction process, the welding heat needs to be strictly controlled to protect the concrete in the steel pipe. Therefore, the traditional connection method is complex to construct and has high quality requirements.

[0006] 2) After welding, there is usually a small gap between the upper and lower round steel pipes, which needs to be filled with grouting, but the space is closed after welding, and the quality of grouting is not easy to detect;

[0007] 3) Low temperatures in cold areas will affect welding quality and place high demands on construction.

[0008] 4) Round steel pipe welding requires 360-degree welding, which requires professional technicians. Ordinary welders' welding operations are difficult to meet the requirements, which puts higher requirements on the operators.

[0009] 5) After the upper and lower components of the fully prefabricated steel pipe structure are installed and positioned, additional temporary fixings need to be set up before welding as temporary supports during the construction process, which need to be removed after welding, making the construction cumbersome. Utility Model Content

[0010] In view of the shortcomings of the prior art, the utility model proposes a fully prefabricated assembled steel tube concrete structure, in which the upper row of steel tube concrete and the lower row of steel tube concrete in the structure adopt a new plug-in key + anchor connection method to transmit internal force between the upper and lower steel tube concrete, and no longer require welding construction, thereby solving the defect of high heat from welding damaging the precast concrete in the tube.

[0011] The technical solution of the utility model is as follows:

[0012] A fully prefabricated assembled steel tube concrete structure is formed by vertically connecting an upper row of steel tube concrete and a lower row of steel tube concrete, wherein the upper row of steel tube concrete and the lower row of steel tube concrete are formed by arranging upper steel tube concrete and lower steel tube concrete of a predetermined number and spacing in a row, wherein: the upper steel tube concrete has an upper connecting section, which is annularly contracted and arranged at the bottom of the upper steel tube concrete and cast integrally with the upper steel tube concrete, and the side wall of the upper connecting section is provided with at least one annular plug-in groove; the lower steel tube concrete has a lower connecting section, which is annularly expanded and arranged at the top of the lower steel tube concrete, and is connected to the A vertical plug-in portion is provided between the tops of the lower steel tube concrete, and a plurality of plug-in holes are radially opened on the side wall of the lower connecting section corresponding to at least one of the annular plug-in grooves; and the upper connecting section is plugged into the vertical plug-in portion, and an annular gap is reserved between the upper connecting section and the lower connecting section, and the annular gap is connected to the vertical plug-in portion, and a plurality of plug-in keys match the plurality of plug-in holes, and are plugged and fixed to the annular plug-in groove through the plug-in holes to fix the upper connecting section and the lower connecting section; and grouting material is poured into the annular gap, and the grouting material is poured from the annular gap into the annular plug-in groove and the vertical plug-in portion.

[0013] In some embodiments, the peripheries of the upper steel tube concrete and the lower steel tube concrete arranged in a row are provided with prefabricated peripheral reinforced concrete, and the prefabricated peripheral reinforced concrete is formed by tying a steel frame around the peripheries of the upper steel tube concrete and the lower steel tube concrete and pre-casting external concrete.

[0014] In some embodiments, the upper row of steel tube concrete and the lower row of steel tube concrete are cast in situ in the connection area to form a horizontal cast-in-situ section.

[0015] In some embodiments, it also includes an upper horizontal ring plate, which is circumferentially arranged on the side wall of the upper connecting section, and a certain gap is reserved between the upper horizontal ring plate and the bottom of the upper steel tube concrete to form the circumferential plug-in groove.

[0016] In some embodiments, the depth of the annular insertion groove is 10-20 mm.

[0017] In some embodiments, it further includes a lower horizontal ring plate, which is circumferentially arranged at the bottom of the lower connecting section, and the lower connecting section is welded and fixed to the steel tube of the lower steel tube concrete through the lower horizontal ring plate.

[0018] In some embodiments, a flow gap is provided between the bottom of the upper concrete filled steel tube and the top of the lower concrete filled steel tube.

[0019] In some embodiments, the thickness of the lower connecting section is greater than the wall thickness of the lower concrete-filled steel tube.

[0020] In some embodiments, the dimension of the bottom of the upper steel tube concrete inserted into the lower connecting section is not less than 100 mm.

[0021] In some embodiments, the insertion depth of the plug key into the annular plug groove is not less than 10 mm.

[0022] The beneficial effects of the utility model compared with the prior art are:

[0023] The utility model proposes a fully prefabricated assembled steel tube concrete structure, in which the upper row of steel tube concrete and the lower row of steel tube concrete in the structure adopt a plug-in key + anchor connection method to transmit internal force between the upper and lower steel tube concrete, and no welding construction is required, thereby solving the defect that high heat from welding damages the precast concrete in the tube. The utility model is easy to operate, can greatly save labor and improve production efficiency.

[0024] The utility model utilizes a plug key to be inserted into an annular plug groove through a plug hole and grouting material is poured into the annular plug groove and the vertical plug part through an annular gap to achieve a stable connection between the upper steel tube concrete and the lower steel tube concrete. Through the double-layer action of the plug key and high-strength grouting, the internal force transmission and ductility of the connection between the upper and lower steel tube concrete can be effectively met, thereby achieving a strong connection between weak components.

[0025] The utility model is different from the traditional grouting. An annular gap is reserved between the upper steel tube concrete and the lower connecting section of the utility model, that is, the gap between the upper and lower steel tube concrete is open and not closed, and the grouting quality of the grouting material is easy to ensure and monitor.

[0026] The utility model does not need to embed temporary fixing facilities on the prefabricated parts, and the plug-in keys can play a temporary support role in construction. It is a self-load-bearing technology, which can reduce the processes of embedding temporary fixing facilities, cutting off the temporary fixing facilities after installation, and coating and sealing the surface after cutting, thereby reducing the workload and improving the construction speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0028] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0029] Figure 1 It is a schematic diagram of the overall elevation of a fully prefabricated assembled steel tube concrete structure of some embodiments of the utility model;

[0030] Figure 2 It is a schematic plan view of a fully prefabricated assembled steel tube concrete structure according to some embodiments of the utility model;

[0031] Figure 3 It is a schematic diagram of the exploded state of the facade of the fully prefabricated assembled steel tube concrete structure in some embodiments of the utility model;

[0032] Figure 4 Schematic diagram of the connection and combination state of the upper concrete-filled steel tube and the lower concrete-filled steel tube in some embodiments of the utility model;

[0033] Figure 5 It is a schematic diagram of the exploded connection state of the upper concrete-filled steel tube and the lower concrete-filled steel tube in some embodiments of the utility model;

[0034] Figure 6 for Figure 4 1-1 cross-sectional schematic diagram;

[0035] Figure 7 for Figure 4 2-2 cross-sectional schematic diagram;

[0036] Figure 8 It is a schematic plan view of the upper connecting section of some embodiments of the utility model;

[0037] Fig. 9 It is a schematic plan view of the lower connecting section of some embodiments of the utility model.

[0038] Markings in the figure:

[0039] 1-upper steel tube concrete; 101-upper steel tube; 2-upper connecting section; 201-annular plug-in groove; 3-lower steel tube concrete; 301-lower steel tube; 4-lower connecting section; 401-vertical plug-in part; 402-annular gap; 403-plug-in hole; 5-plug-in key; 6-grouting material; 7-upper horizontal ring plate; 8-lower horizontal ring plate; 9-circulation gap; 10-horizontal cast-in-place section; 11-steel skeleton; 12-external concrete; 1a-upper row steel tube concrete; 3a-lower row steel tube concrete.

[0040] The same or corresponding symbols in the drawings indicate the same or corresponding parts. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model more clear, the embodiment of the utility model is further described in detail below in combination with the embodiment and the drawings. Here, the illustrative embodiment of the utility model and its description are used to explain the utility model, but are not used as a limitation of the utility model.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] It should be understood that the terms "include / comprise", "consist of..." or any other variations are intended to cover non-exclusive inclusion, so that a product, device, process or method that includes a series of elements includes not only those elements, but also may include other elements not explicitly listed when necessary, or also includes elements inherent to such product, device, process or method. In the absence of more restrictions, the elements defined by the sentence "include / comprise...", "consist of..." do not exclude the presence of other identical elements in the product, device, process or method that includes the elements.

[0044] It is also necessary to understand that terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and 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 direction, be constructed or operate in a specific direction, and cannot be understood as a limitation on the present invention.

[0045] In addition, in the description of the present invention, “plurality” means two or more than two, unless otherwise clearly and specifically defined.

[0046] The existing steel tube concrete connections are generally made by welding, which has the following problems: welding is difficult, welding quality is difficult to ensure, and the high heat generated by welding can easily damage the precast concrete in the steel tube. Based on the above problems, the utility model proposes a new steel tube concrete connection form, which adopts a plug-in key + anchor connection method to transfer internal force between the upper and lower steel tube concretes, and no longer requires welding construction, thereby solving the defect of high welding heat damaging the precast concrete in the steel tube.

[0047] The implementation of the present invention is described in detail below in conjunction with preferred implementation modes.

[0048] The utility model proposes a fully prefabricated assembled steel tube concrete structure. Figures 1 to 9 The fully prefabricated assembled steel tube concrete structure is formed by vertically connecting the upper steel tube concrete 1a and the lower steel tube concrete 3a prefabricated in advance in the factory at the construction site. The upper steel tube concrete 1a is formed by the upper steel tube concrete 1 with a predetermined number and spacing arranged in a row, and prefabricated peripheral reinforced concrete is arranged along the periphery. The lower steel tube concrete 3a is also formed by the lower steel tube concrete 3 with a predetermined number and spacing arranged in a row, and prefabricated peripheral reinforced concrete is arranged along the periphery.

[0049] In some embodiments, the prefabricated outer reinforced concrete is mainly formed by tying a steel bar skeleton 11 around the outer periphery of the upper steel tube concrete 1 and the lower steel tube concrete 3 and pre-casting the outer concrete 12 .

[0050] See also Figure 1 The utility model shows that three upper steel tube concrete tubes 1 and three lower steel tube concrete tubes 3 are arranged in a row, and then steel bars are tied around the upper steel tube concrete tubes 1 and the lower steel tube concrete tubes 3 arranged in a row and external concrete 12 is poured to prefabricate the upper row of steel tube concrete tubes 1a and the lower row of steel tube concrete tubes 3a.

[0051] Continue to see Figure 1 The upper row of steel tube concrete 1a and the lower row of steel tube concrete 3a are cast in situ concrete at the connection area to form a horizontal cast-in-situ section 10. The horizontal cast-in-situ section 10 can effectively connect the upper row of steel tube concrete 1a and the lower row of steel tube concrete 3a into a whole, thereby increasing the rigidity and stability of the entire structure.

[0052] The key to the vertical connection of the upper row of steel tube concrete 1a and the lower row of steel tube concrete 3a to form a fully prefabricated assembled steel tube concrete structure is that the upper steel tube concrete 1 and the lower steel tube concrete 3 are connected by a plug-in key + anchor connection method, avoiding the welding construction of the upper row of steel tube concrete 1a and the lower row of steel tube concrete 3a, thereby improving the efficiency of the prefabricated steel tube concrete structure. At the same time, this connection method ensures the effective transmission of internal forces at the nodes, avoiding the risk of stress concentration and fracture.

[0053] See Figures 4 to 9 The upper steel tube concrete 1 comprises an upper steel tube 101 filled with concrete. The upper steel tube concrete 1 has an upper connecting section 2, which is circumferentially contracted and arranged at the bottom of the upper steel tube concrete 1. The upper connecting section 2 is welded and fixed to the bottom of the upper steel tube 101. At the same time, the upper connecting section 2 is integrally cast with the upper steel tube concrete 1.

[0054] It should be understood that the annular shrinkage here refers to the overall shrinkage or shrinkage along the central axis of the outer wall around the upper steel pipe 101. Integral casting means that the upper connecting section 2 and the upper steel pipe 101 are cast with concrete at the same time, which ensures that the connection between them is tight and seamless.

[0055] In the present invention, the upper steel tube concrete 1 is a prefabricated steel tube concrete. The upper steel tube concrete 1 is manufactured in a factory according to specific designs and specifications. Its manufacturing process includes steps such as steel tube preparation, concrete pouring and curing, and subsequent node processing. The upper steel tube concrete 1 manufactured in this way has a high degree of uniformity and consistency, ensuring its stability and reliability during use.

[0056] In some embodiments, the cross-sectional shape of the upper connecting section 2 is the same as that of the upper steel tube 101. It is generally circular. Specifically, the upper connecting section 2 is a section of a circular steel tube that shrinks inward at the bottom of the upper steel tube concrete 1.

[0057] The upper connecting section 2 is welded and fixed to the upper steel tube 101 on the upper concrete-filled steel tube 1 via a connecting plate.

[0058] In the utility model, the side wall of the upper connecting section 2 is provided with at least one annular plug-in groove 201 so as to facilitate the plug-in fixing of the upper concrete-filled steel tube 1 and the lower concrete-filled steel tube 3 by inserting the plug-in key 5 .

[0059] The purpose of designing the upper connecting section 2 of the utility model is mainly to facilitate the insertion of the upper steel tube concrete 1 into the lower steel tube concrete 3 and form an annular insertion groove 201, thereby improving the positioning accuracy and enhancing the stability of the structure.

[0060] In some embodiments, the radius of the upper connection section 2 is 10-20mm smaller than the radius of the upper steel tube concrete 1, that is, the depth of the annular plug groove 201 is generally controlled at 10-20mm. It is easy to understand that the plug key 5 must be inserted into the annular plug groove 201 to a certain depth in order to play a bite effect. The wall thickness of the lower connection section 4 is generally 8-10mm, that is, the external support of the plug key 5 is about 10mm, so the plug key 5 in the annular plug groove 201 should not be less than 10mm. But it cannot be too long, otherwise the deeper the groove, the smaller the diameter of the upper connection section 2, and the inconvenience of concrete pouring, and the longer the support, the thicker the ring plate, in order to ensure the connection stiffness, so the depth of the annular plug groove 201 is selected to be 10-20mm.

[0061] In the present invention, one, two or more annular plug-in grooves 201 may be provided along the height direction of the upper connecting section 2, and the specific design quantity is mainly determined according to the load-bearing requirements of the row of steel pipes, the structural stability requirements and the construction conditions. The present invention does not make any limitation.

[0062] In some embodiments, the connection node further comprises an upper horizontal ring plate 7, see Figure 8 The upper horizontal ring plate 7 is circumferentially arranged on the side wall of the upper connecting section 2. The inner ring of the upper horizontal ring plate 7 is welded and fixed to the side wall of the upper connecting section 2. Figure 4 A certain gap is reserved between the top surface of the upper horizontal ring plate 7 and the bottom of the upper steel tube concrete 1 to form the above-mentioned annular plug-in groove 201.

[0063] It is easy to understand that the number of upper horizontal ring plates 7 is determined by the number of annular plug-in slots 201 required by the structural design, and the present invention does not make any specific limitation.

[0064] See also Figure 4 , Figure 5 The lower steel tube concrete 3 is arranged below the upper steel tube concrete 1. The lower steel tube concrete 3 has the same shape and structure as the upper steel tube concrete 1 and is also prefabricated steel tube concrete. Since the upper and lower steel tube concretes have the same shape and structure and are both prefabricated steel tube concrete, they are consistent in terms of materials, manufacturing process, mechanical properties, etc., thereby ensuring the standardization and reliability of the entire steel tube concrete structure.

[0065] Specifically, the lower steel tube concrete 3 includes a lower steel tube 301, which is filled with concrete. The lower steel tube concrete 3 has a lower connecting section 4, which is annularly expanded and arranged at the top of the lower steel tube concrete 3 and is welded and fixed to the top of the lower steel tube concrete 3. That is, the lower connecting section 4 is welded and fixed to the top of the lower steel tube 301.

[0066] It should be understood that the annular expansion here refers to the overall expansion or enlargement of the outer wall around the lower steel pipe 301 along the central axis direction.

[0067] In some embodiments, the cross-sectional shape of the lower connecting section 4 is the same as that of the lower steel tube 301 , which is generally circular. Specifically, the lower connecting section 4 is a section of a circular steel tube that expands outward at the top of the lower steel tube concrete 3 .

[0068] The lower connecting section 4 is welded and fixed to the lower steel tube 301 on the lower concrete filled steel tube 3 via a connecting plate.

[0069] Continue to see Figure 4 , Figure 5 A vertical plug-in portion 401 is formed between the lower connecting section 4 and the top of the lower concrete-filled steel tube 3 for vertically plugging the upper concrete-filled steel tube 1 .

[0070] See also Figure 4 , the entire length of the upper connection section 2 and the bottom part of the upper steel pipe 101 are inserted into the vertical plug-in portion 401. In the present utility model, considering the importance of tension transmission and the important role of the upper and lower steel pipes in the steel tube concrete vertical member, it is recommended that the length of the upper steel tube concrete 1 inserted into the lower connection section 4 can meet the anchoring length of tension transmission, and the overall length of the upper steel tube concrete 1 inserted into the lower connection section 4 is not less than 100mm. That is, the length of the upper connection section 2 and the upper steel pipe 101 as a whole inserted into the lower connection section 4 is not less than 100mm.

[0071] It is easy to understand that the specific value of the plug-in length needs to be determined based on calculations. The calculation conditions include the diameter, thickness, strength of the steel pipe and the strength of the grouting material that needs to be poured in later. The length should meet the anchoring requirements for the internal force transmission of the upper steel pipe to ensure that the connection between the steel pipes is strong enough to effectively resist external forces and reduce the risk of structural damage or failure due to loose connections.

[0072] In the present invention, the outer sides of the upper steel pipe 101 and the upper connecting section 2 inserted into the lower connecting section 4 should be roughened, and the inner wall of the lower connecting section 4 should be roughened, so as to increase the friction of the side wall and better transmit the internal force between the upper and lower steel pipe concrete.

[0073] Continue to see Figure 4 An annular gap 402 is reserved between the lower connection section 4 and the side wall of the upper steel tube concrete 1. The top of the annular gap 402 is open and connected to the vertical plug-in portion 401. The existence of the annular gap 402 allows the subsequent pouring of the grouting material 6 to fully flow and penetrate into every corner of the steel pipe connection, avoiding uneven pouring or voids caused by insufficient space. At the same time, this design also helps to discharge air and excess grouting material 6 during the pouring process, which not only ensures that the grouting material 6 poured later can completely fill the gap, but also prevents quality problems caused by air entrapment or accumulation of excess grouting material 6.

[0074] A plurality of plug holes 403 are radially opened on the side wall of the lower connecting section 4 at positions corresponding to the annular plug groove 201 , so as to facilitate the insertion of the plug key 5 to anchor the upper concrete-filled steel tube 1 and the lower concrete-filled steel tube 3 .

[0075] In some embodiments, the height of the plug hole 403 is comparable to the height of the annular plug groove 201 , which can ensure that the plug key 5 can completely enter the annular plug groove 201 when inserted, forming a stable and tight connection.

[0076] In the present invention, the plug hole 403 is used in conjunction with the annular plug groove 201, so that the upper and lower steel tube concrete connections are more tightly connected. The annular plug groove 201 provides annular positioning for the plug key 5. Since the annular plug groove 201 is annularly continuous, the plug key 5 can be easily inserted into the annular plug groove 201 after being inserted into the plug hole 403, ensuring the ease of construction and installation. This dual positioning mechanism makes the installation of the upper and lower steel tube concrete more accurate, convenient and reliable.

[0077] It is easy to understand that the plug holes 403 can be arranged in one or more rows along the lower connecting section 4 vertically, and the number of the plug holes 403 corresponds to the number of the annular plug grooves 201, and each annular plug groove 201 is correspondingly provided with a plurality of plug holes 403. Figure 7 The utility model preferably has 8 plug holes 403.

[0078] The specific number of the plug holes 403 corresponding to each annular plug groove 201 needs to be comprehensively considered according to multiple factors such as actual engineering requirements, specifications and dimensions of the steel pipe, stress conditions of the connection section, and construction convenience. The present utility model does not make specific limitations.

[0079] In some embodiments, the radius of the lower connecting section 4 is about 10 mm larger than the radius of the lower steel pipe 301. In the present invention, the radius of the upper and lower steel pipes are consistent. Since the upper steel tube concrete 1 needs enough space to be inserted into the lower connecting section 4, and there is a certain error in the on-site installation, the reserved space is designed to make the radius of the lower connecting section 4 larger than the radius of the lower steel pipe 301, so as to have a sufficient tolerance rate.

[0080] In some embodiments, the thickness of the lower connecting section 4 is greater than the wall thickness of the lower steel tube concrete 3, that is, greater than the wall thickness of the lower steel tube 301. Since the plug hole 403 is to be provided on the lower connecting section 4, the cross section is greatly weakened, so the wall thickness needs to be increased to ensure that the bearing capacity of the lower connecting section 4 is not less than that of the lower steel tube 301.

[0081] In some embodiments, the connection node also includes a lower horizontal ring plate 8, see Fig. 9The lower horizontal ring plate 8 is circumferentially arranged on the top of the lower steel tube concrete 3 to facilitate the connection with the lower connecting section 4. Preferably, the inner ring of the lower horizontal ring plate 8 is welded and fixed to the lower steel tube 301, and the outer ring is welded and fixed to the lower connecting section 4.

[0082] See also Figure 4 , Figure 5 , Figure 7 There are multiple plug keys 5, which match the plug holes 403 and are suitable for being plugged and fixed into the annular plug groove 201 through the plug holes 403 when connecting the upper steel tube concrete 1 and the lower steel tube concrete 3. The number and strength of the plug keys 5 require that their shear bearing capacity is not less than the tensile bearing capacity of the round steel tube.

[0083] In some embodiments, the plug key 5 is a pin key or a long strip plug block. Pin keys are also called clips, inserts, and card plates in industrial activities. Their main function is to fix the positions of two shafts so that they can work together. The basic materials of the pin key include carbon steel, stainless steel, brass, etc., and their sizes are selected according to the diameter and length of the bearing.

[0084] The height of the plug key 5 is slightly smaller than the height of the annular plug groove 201 or the plug hole 403, so as to facilitate insertion into the annular plug groove 201 through the plug hole 403. For example, the height of the plug key 5 is 1-2 mm lower than the height of the annular plug groove 201 or the plug hole 403. Alternatively, the plug key 5 is interference fit with the annular plug groove 201 or the plug hole 403.

[0085] In some embodiments, the depth of the plug key 5 inserted into the annular plug groove 201 is not less than 10 mm, which ensures the stability and safety of the steel tube concrete connection, improves the reliability and durability of the connection, and takes into account the operational convenience and precision requirements during the construction process.

[0086] In the present invention, the matching of multiple plug keys 5 and plug holes 403 enhances the stability and reliability of the connection. By increasing the number of plug keys 5, the steel tube concrete can be fixed at multiple positions to form multi-point support. This multi-point fixing method effectively disperses the force and reduces the possibility of stress concentration, thereby improving the stability and bearing capacity of the overall structure.

[0087] In addition, multi-point plugging helps to resist the action of external forces. At the steel tube concrete connection, external forces (such as wind load, earthquake force, etc.) may cause relative displacement of the steel tube concrete. The uniform distribution of multiple plug keys 5 can provide resistance in different directions, prevent the steel tube concrete from displacement or distortion, and ensure the stability and safety of the connection.

[0088] In addition, the provision of multiple plug keys 5 also improves the uniformity and integrity of the connection. By inserting the plug keys 5 at different positions, it is possible to ensure that the stress distribution at the steel tube concrete connection is more uniform, reducing the risk of local damage caused by uneven stress. At the same time, multi-point fixation also helps to enhance the integrity of the steel tube concrete connection, making the entire structure more solid and stable.

[0089] The utility model adopts a matching design of multiple plug keys and plug holes to make the construction process more convenient and efficient. Construction personnel can flexibly select the number and position of the plug keys according to needs to adapt to different construction conditions and requirements. At the same time, this design also helps to improve the accuracy and quality of construction and ensure the stability and reliability of the steel tube concrete connection.

[0090] The utility model does not need to embed temporary fixing facilities on the prefabricated parts during the construction and installation process. The plug-in keys can play a temporary support role in the construction. It is a self-load-bearing technology, which can reduce the processes of embedding temporary fixing facilities, cutting off the temporary fixing facilities after installation, and coating and sealing the surface after cutting, thereby reducing the workload and improving the construction speed.

[0091] See also Figure 4 Due to the presence of the annular gap 402, the grouting material 6 is poured into the annular gap 402, and the grouting material 6 is poured into the annular plug groove 201 and the vertical plug part 401 through the annular gap 402. The pouring of the grouting material 6 through the annular gap 402 makes it unnecessary for construction workers to perform complicated operations or additional filling work. This not only reduces construction time and cost, but also reduces the difficulty of operation, making the entire construction process simpler and more efficient.

[0092] The annular gap 402 allows the grouting material 6 to flow in naturally under the action of gravity and enter the annular splicing groove 201 and the vertical splicing portion 401 through this channel. This ensures that all gaps in the steel tube concrete connection can be fully filled, avoiding structural weakening or safety hazards caused by insufficient filling.

[0093] After filling the gap, the grouting material 6 forms a solid whole, tightly connecting the upper steel tube concrete 1 and the lower steel tube concrete 3. This connection method not only increases the contact area, but also improves the rigidity and durability of the connection through the curing effect of the grouting material.

[0094] The grouting material 6 in the utility model is selected as a high-strength grouting material, which is prepared with high-strength materials as aggregates, cement as a binder, and supplemented with high-fluidity, micro-expansion, anti-segregation and other materials. A certain amount of water is added to the construction site, and it can be used after being stirred evenly. The high-strength grouting material has the characteristics of good self-flow, fast hardening, high early strength, no shrinkage, micro-expansion, non-toxic and harmless, no aging, no pollution to water and the surrounding environment, good self-tightness and rust resistance. In addition, it also has the advantages of reliable quality, low cost, short construction period, and convenient use.

[0095] In some embodiments, in order to ensure the grouting quality of the high-strength grouting material, a monitoring device, such as a pinhole camera, may be provided in the vertical plug-in portion 401 to facilitate recording of the entire process to monitor the grouting quality.

[0096] In the present invention, the upper and lower steel tube concrete connections should be able to effectively transmit tension, pressure, shear and bending moment. On the basis of high-strength grouting, the transmission of pressure and shear force can be effectively guaranteed, and the most important thing is the transmission of tension. The present invention uses the plug-in key 5 and the grouting material 6 as a combination of tension transmission. Through the double-layer effect of the plug-in key 5 and the grouting material 6, the internal force transmission and ductility of the upper and lower steel tube concrete connections can be effectively met, thereby achieving strong connection of weak components. When the structure encounters extreme load conditions, the internal force of the steel tube exceeds the transmission capacity of the grouting material 6. The plug-in key 5 will work together with the grouting material 6 to transmit the internal force and provide sufficient ductility for the vertical connection.

[0097] In some embodiments, see Figure 4 There is a flow gap 9 between the top of the lower steel tube concrete 3 and the bottom of the upper steel tube concrete 1. The flow gap 9 provides a channel for the flow of the grouting material 6 on the one hand, and on the other hand, the flow gap 9 allows the upper steel tube concrete 1 and the lower steel tube concrete 3 to have a certain relative displacement space when the temperature changes, thereby reducing the influence of thermal stress on the connection part, and providing a tolerance space for the installation of prefabricated components.

[0098] The utility model eliminates welding. On the one hand, the high heat of welding may cause damage to the precast concrete inside the steel tube, but such damage is difficult to detect and cannot be evaluated; on the other hand, the area for welding the upper steel tube concrete and the lower steel tube concrete is relatively narrow, and it is very difficult to weld the upper and lower steel tube concrete at full length of 360 degrees, that is, it is very difficult to weld and connect the upper row of steel tube concrete and the lower row of steel tube concrete, which has high technical requirements for construction personnel, not only easily causing safety hazards, but also causing defects such as slow construction speed and extended construction period.

[0099] The utility model adopts a plug-in key + anchor connection method to transfer internal force between the upper and lower steel tube concrete, and no longer requires welding construction to adapt to the environment. In high and severe cold areas, the welding quality cannot be guaranteed when the temperature is too low, which makes it impossible to construct at low temperatures; in humid and rainy seasons, welding construction will also be greatly affected; in remote plateau areas, where the population is sparse and the project volume is very small (such as farmhouses), it is still necessary to equip highly skilled welders, which will obviously cost more. The utility model cancels the welding operation, which is obviously more adaptable to the environment and has fewer restrictions.

[0100] The fully prefabricated assembled steel tube concrete structure of the utility model has the following advantages:

[0101] High precision: As the plug-in parts of the upper and lower steel tube concrete are prefabricated in the factory, including the annular plug-in groove, vertical plug-in part and plug-in hole reservation, all adopt precise machining to ensure the accuracy and consistency of the size. This high-precision prefabricated part makes on-site installation easier and also improves the accuracy and reliability of the connection.

[0102] High safety: The close fit between the plug key, the plug hole and the annular plug groove, as well as the filling of grouting material in the annular plug groove and the vertical plug part, form a strong and stable connection structure. This connection method can effectively resist external forces, reduce the risk of loosening or falling off of the structure, and improve the safety of the overall structure.

[0103] Reduce on-site welding workload: The traditional steel tube concrete structure connection method often requires a lot of welding work on site, which not only increases the construction difficulty and cost, but also may affect the overall performance of the structure due to unstable welding quality. With this plug-in anchor connection method, most of the welding work is completed in the factory, and only simple plug-in and grouting operations are required on site, which greatly reduces the on-site welding workload and improves construction efficiency.

[0104] Adapt to complex construction environments: In some complex construction environments, such as high-altitude operations and narrow spaces, traditional welding connection methods may be greatly restricted. However, this plug-in anchoring connection method does not require complex welding equipment, but only requires simple tools and operating space to complete the connection work, so it is more suitable for various complex construction environments.

[0105] See also Figures 1 to 3The construction process of the fully prefabricated assembled row of steel tube concrete structures of the utility model includes the following steps: S1: prefabricate the upper steel tube concrete 1 and the lower steel tube concrete 3 in the factory, and weld the upper connecting section 2 to the bottom of the upper steel tube concrete 1, and weld the lower connecting section 4 to the top of the lower steel tube concrete 3. Specifically, it includes reserving an annular plug-in groove 201 at a specific position of the upper connecting section 2, and forming a vertical plug-in portion 401 and a plug-in hole 403 reserved at a specific position inside the lower connecting section 4. S2: Arrange the upper steel tube concrete 1 and the lower steel tube concrete 3 in rows with a predetermined number and spacing according to the design requirements. For example, in the figure, 3 upper steel tube concretes 1 and 3 lower steel tube concretes 3 are arranged in a row, and then tie steel bars around the upper steel tube concrete 1 and the lower steel tube concrete 3 and pour external concrete 12 to form the upper row of steel tube concrete 1a and the lower row of steel tube concrete 3a. S3: The lower row of steel tube concrete 3a and the upper row of steel tube concrete 1a are hoisted at the construction site. After the lower row of steel tube concrete 3a is installed in place, the upper connecting section 2 at the bottom of the upper row of steel tube concrete 1a is inserted into the vertical plug-in part 401 at the top of the lower row of steel tube concrete 3a. S4: Insert the positions of multiple plug-in keys 5 corresponding to multiple plug-in holes 403 into the annular plug-in groove 201. S5: Pour the grouting material 6 into the annular plug-in groove 201 and the vertical plug-in part 401 through the annular gap 402. S6: Tie the steel bars in the horizontal connection section of the upper row of steel tube concrete 1a and the lower row of steel tube concrete 3a, and cast the concrete in place. It is easy to understand that in S4, the verticality of the upper row of steel tube concrete 1a needs to be adjusted with a steel wedge. After the verticality adjustment is completed, the temporary fixation is completed and the hoisting equipment can be removed.

[0106] This type of construction not only improves construction efficiency and connection accuracy, but also enhances the safety and stability of the structure. It also reduces on-site welding workload, adapts to complex construction environments, and facilitates future maintenance work.

[0107] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

[0108] Although several specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present invention. Certain features described in the context of a separate embodiment may also be implemented in a single implementation in combination. On the contrary, the various features described in the context of a single implementation may also be implemented in multiple implementations individually or in any suitable sub-combination.

Claims

1. A fully prefabricated assembled steel tube concrete structure, formed by vertically connecting an upper row of steel tube concrete and a lower row of steel tube concrete, wherein the upper row of steel tube concrete and the lower row of steel tube concrete are formed by arranging upper steel tube concrete and lower steel tube concrete in a row with a predetermined number and spacing, characterized in that: The upper steel tube concrete has an upper connection section, which is annularly contracted and arranged at the bottom of the upper steel tube concrete and cast integrally with the upper steel tube concrete, and the side wall of the upper connection section is provided with at least one annular plug-in groove; The lower steel tube concrete has a lower connecting section, which is annularly expanded and arranged at the top of the lower steel tube concrete, and has a vertical plug-in portion between the lower steel tube concrete and the top of the lower steel tube concrete. The side wall of the lower connecting section is radially provided with a plurality of plug-in holes corresponding to at least one of the annular plug-in grooves; and The upper connecting section is plugged into the vertical plug-in portion, and an annular gap is reserved between the upper connecting section and the lower connecting section, the annular gap is connected to the vertical plug-in portion, a plurality of plug keys match a plurality of the plug holes, and the plug holes are plugged and fixed to the annular plug groove to fix the upper connecting section and the lower connecting section; and The annular space is filled with grouting material, and the grouting material is poured from the annular space into the annular plug-in groove and the vertical plug-in portion.

2. The fully prefabricated assembled steel tube concrete structure according to claim 1, characterized in that: The peripheries of the upper steel tube concrete and the lower steel tube concrete arranged in a row are provided with prefabricated peripheral reinforced concrete, and the prefabricated peripheral reinforced concrete is formed by tying a steel skeleton around the peripheries of the upper steel tube concrete and the lower steel tube concrete and pre-casting external concrete.

3. The fully prefabricated assembled steel tube concrete structure according to claim 1, characterized in that: The upper row of steel tube concrete and the lower row of steel tube concrete are connected by cast-in-place concrete to form a horizontal cast-in-place section.

4. The fully prefabricated assembled steel tube concrete structure according to claim 1, characterized in that: It also includes an upper horizontal ring plate, which is circumferentially arranged on the side wall of the upper connecting section, and a certain gap is reserved between the upper horizontal ring plate and the bottom of the upper steel tube concrete to form the circumferential plug-in groove.

5. The fully prefabricated assembled steel tube concrete structure according to claim 1, characterized in that: The depth of the annular plug-in groove is 10-20 mm.

6. The fully prefabricated assembled steel tube concrete structure according to claim 1, characterized in that: It also includes a lower horizontal ring plate, which is circumferentially arranged at the bottom of the lower connecting section. The lower connecting section is welded and fixed to the steel pipe of the lower steel tube concrete through the lower horizontal ring plate.

7. The fully prefabricated assembled steel tube concrete structure according to claim 1, characterized in that: A flow gap is provided between the bottom of the upper concrete-filled steel tube and the top of the lower concrete-filled steel tube.

8. The fully prefabricated assembled steel tube concrete structure according to claim 1, characterized in that: The thickness of the lower connecting section is greater than the wall thickness of the lower concrete-filled steel tube.

9. The fully prefabricated assembled steel tube concrete structure according to claim 1, characterized in that: The dimension of the bottom of the upper steel tube concrete plugged into the lower connecting section is not less than 100 mm.

10. The fully prefabricated assembled steel tube concrete structure according to claim 1, characterized in that: The insertion depth of the plug-in key into the annular plug-in groove is not less than 10 mm.

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