Steel sleeve reinforced multi-constrained concrete column connection structure and construction method

Abstract

A steel sleeve reinforced multi-constrained concrete column connection structure and construction method, comprising a reinforcing steel cylinder sleeved on the outside of the concrete column to be reinforced, the reinforcing steel cylinder comprising a top reinforcing steel cylinder, a bottom reinforcing steel cylinder and a multi-section middle reinforcing steel cylinder arranged between the top reinforcing steel cylinder and the bottom reinforcing steel cylinder, the height of the top reinforcing steel cylinder, the multi-section middle reinforcing steel cylinder and the bottom reinforcing steel cylinder after connection matches the height of the concrete column to be reinforced, the top reinforcing steel cylinder, the middle reinforcing steel cylinder and the bottom reinforcing steel cylinder have the same structure and are all assembled from two semicircular steel pipes, the top reinforcing steel cylinder and the middle reinforcing steel cylinder, the adjacent middle reinforcing steel cylinders and the bottom reinforcing steel cylinder of the middle reinforcing steel cylinder are all connected by arc buckles and H-shaped steels, and concrete is poured in the gaps between the top reinforcing steel cylinder, the middle reinforcing steel cylinder and the bottom reinforcing steel cylinder and the concrete column to be reinforced. The present invention can better restrain the original concrete column and the newly poured concrete, so that they are stressed together, and can greatly improve the bearing capacity and deformation capacity of the reinforced column, thereby having a better reinforcement effect.

Description

Technical Field

[0001] The invention relates to a steel sleeve reinforced multi-constrained concrete column connection structure and a construction method. Background Art

[0002] For existing buildings with a long service life, due to long-term physical and chemical erosion, the concrete on the surface of the existing reinforced concrete columns is easily damaged and falls off, resulting in a decrease in the bearing capacity of the columns and failure to meet the durability requirements. At the same time, it is also very common to add equipment to existing buildings or change their use functions. The above two reasons may cause the existing reinforced concrete columns to fail to meet the current design requirements. Therefore, it is necessary to reinforce the existing reinforced concrete columns. The existing concrete column reinforcement methods mainly include reinforced concrete cross-section enlargement method, steel plate bonding method, fiber cloth bonding method or steel casing reinforcement method. The reinforced concrete cross-section enlargement method requires support formwork, and the steel plate bonding method and fiber cloth bonding method require the use of building structural adhesives, anchor nails and other operations, all of which have the disadvantages of complex construction, large workload and high cost. Moreover, the components of the above three methods all have weaknesses in terms of force performance. For example, when the reinforced concrete cross-section enlargement method is used, there is a problem that the interface between the new and old concrete may be separated, and when the material bonding method is used, there are problems with the quality and durability of the adhesive between the steel plate and the concrete interface and the fiber reinforced composite material and the concrete interface. The steel casing reinforcement method does not require on-site support formwork, and the restraining effect of steel pipes on concrete can make the reinforced components have better stress-bearing performance than other reinforcement schemes, thereby saving construction costs, materials, and building space. Based on the above advantages of the steel casing reinforcement method, in order to promote its application, engineers and researchers have done a lot of work in terms of reinforcement design and implementation, mechanical properties research, etc. However, on the one hand, most of the existing steel casing reinforcement methods only use single-layer steel casing for reinforcement, and there is little research and application of multiple casing reinforcement technology; on the other hand, during the reinforcement implementation process, it is necessary to add steel casing to the periphery of the original concrete column, and there are difficulties in prefabrication, transportation, construction and installation of steel casing. Specifically, during the construction process, a large amount of on-site welding or bolting work is required for multiple pieces or sections of steel pipes around the original concrete columns, which presents the following problems: if the number of steel pipe sections is small, the size and weight of each piece of steel pipe are large, making transportation and installation difficult; if the number of steel pipe sections is large, the workload of on-site welding or bolting is large; if a solution of wrapping the steel pipes layer by layer to form multiple casings is adopted, the construction workload will double, making it difficult to implement. Summary of the invention

[0003] To achieve the above objectives, the present invention first proposes a steel sleeve reinforced multi-constrained concrete column connection structure and construction method which greatly improves the bearing capacity and deformation capacity of the reinforced column and has a good reinforcement effect.

[0004] The invention relates to a steel sleeve reinforced multi-constrained concrete column connection structure, comprising a reinforced steel cylinder sleeved on the outside of a concrete column to be reinforced, the reinforced steel cylinder comprising a top reinforced steel cylinder, a bottom reinforced steel cylinder and a multi-section middle reinforced steel cylinder arranged between the top reinforced steel cylinder and the bottom reinforced steel cylinder, the height of the top reinforced steel cylinder, the multi-section middle reinforced steel cylinder and the bottom reinforced steel cylinder after being connected matches the height of the concrete column to be reinforced, the top reinforced steel cylinder, the middle reinforced steel cylinder and the bottom reinforced steel cylinder have the same structure and are all assembled from two semicircular steel pipes, the top reinforced steel cylinder and the middle reinforced steel cylinder, the adjacent middle reinforced steel cylinders and the bottom reinforced steel cylinder of the middle reinforced steel cylinder are all connected by arc buckles and H-shaped steels, and concrete is poured in the gaps between the top reinforced steel cylinder, the middle reinforced steel cylinder and the bottom reinforced steel cylinder and the concrete column to be reinforced.

[0005] In this embodiment, grooves are symmetrically provided on the top and bottom surfaces at both ends of the semicircular steel pipe in the circumferential direction, and the size and depth of the grooves match the arc buckle. On both ends of the semicircular steel pipe in the circumferential direction, radially protruding longitudinal stiffening ribs are fixed, and the longitudinal stiffening ribs are arranged axially along the semicircular steel pipe. The two ends of the longitudinal stiffening ribs are flush with the bottom of the grooves at both ends of the semicircular steel pipe. A connecting plate arranged parallel to the longitudinal stiffening ribs is fixed on the inner wall of the semicircular steel pipe. The spacing from the connecting plate to the longitudinal stiffening ribs is not less than the radius of the concrete column to be reinforced. The top and bottom of the connecting plate are provided with axially arranged grooves near its two ends. The spacing between the two grooves on the same side of the connecting plate is not less than the diameter of the concrete column to be reinforced. The depth of the groove is not less than half of the web height of the H-shaped steel and not greater than the web height of the H-shaped steel, and the width of the groove matches the web thickness of the H-shaped steel.

[0006] In this embodiment, the arc buckle includes an arc plate matching the arc of the semicircular steel pipe and a radial plate arranged on the center line of the arc plate along the axial arrangement and protruding radially along the arc plate, the distance from the radial plate to the end of the arc plate matches the length of the groove, the top surface and bottom surface of the arc plate and the radial plate, and the center line along the length direction of the top surface and the bottom surface are respectively provided with a top slot and a bottom slot, the depth of the top slot and the bottom slot are the same, and the top slot of the arc plate and the top slot of the radial plate are connected to each other, the bottom slot of the arc plate and the bottom slot of the radial plate are connected to each other, the width of the top slot and the bottom slot of the arc plate matches the thickness of the semicircular steel pipe, the width of the top slot and the bottom slot of the radial plate matches twice the thickness of the longitudinal stiffening rib, and the thickness of the partition plate between the top slot and the bottom slot of the arc buckle is twice the depth of the groove.

[0007] In this embodiment, the H-shaped steel includes a web and wing plates arranged at both ends of the web, and the length of the web matches the distance between the opposite sides of the two connecting plates in the semicircular steel tube.

[0008] In this embodiment, the height of the web of the H-shaped steel is twice the depth of the groove.

[0009] In this embodiment, the tops of the two semicircular steel tubes constituting the top reinforcing steel cylinder are connected to the top surface through semi-arc buckles and short H-shaped steels, and the bottom reinforcing steel cylinder is connected to the ground where the concrete column to be reinforced is located through semi-arc buckles and short H-shaped steels, the semi-arc buckles include a semi-arc plate matching the curvature of the semi-arc steel tube and a radial plate arranged on the center line of the semi-arc plate along the axial arrangement and protruding radially along the semi-arc plate, the height of the semi-arc plate and the radial plate is half of the height of the arc plate and the radial plate, the distance from the radial plate to the end of the semi-arc plate matches the length of the groove, and the top surface or bottom surface of the semi-arc plate and the radial plate, along the top surface or A first slot is respectively provided on the center line in the length direction of the bottom surface, the first slot of the semi-arc plate and the first slot of the radius plate are connected to each other, the first slot has the same depth as the top slot of the arc buckle, the width of the first slot of the semi-arc plate matches the thickness of the semicircular steel pipe, the width of the first slot of the radius plate matches twice the thickness of the longitudinal stiffening rib, the bottom plate thickness of the arc buckle matches the depth of the groove, the short H-shaped steel includes a short web and short wing plates arranged at both ends of the short web, the length of the short web is the same as the length of the web of the H-shaped steel, the height of the short wing plate and the height of the short web are half the height of the web of the H-shaped steel.

[0010] In this embodiment, a plurality of steel tie ties are axially fixed to the outer side of the concrete column to be reinforced.

[0011] The present invention also includes a construction method for reinforcing a multi-constrained concrete column with a steel sleeve, which utilizes the above-mentioned steel sleeve to reinforce the multi-constrained concrete column connection structure, and specifically includes the following steps:

[0012] Step S1: prefabricate semicircular steel pipes and steel tie ties in advance in the factory;

[0013] Step S2: transport the prefabricated semicircular steel pipes and steel tie ties to the reinforcement site, first clean the concrete column to be reinforced and the concrete floor slab thereunder, and first tie the steel tie ties on the concrete column to be reinforced at a certain interval;

[0014] Step S3: Then install the semicircular steel pipe from bottom to top, first fix two semi-arc buckles and two short H-shaped steels on the concrete slab, then insert the bottoms of the two semicircular steel pipes constituting the bottom reinforcement steel cylinder into the semi-arc buckles and the short H-shaped steels, then insert the arc buckles into the grooves at the top of the bottom reinforcement steel cylinder, insert the H-shaped steels between the adjacent connecting plates, and then assemble multiple groups of middle reinforcement steel cylinders and top reinforcement steel cylinders in sequence; finally, insert two semi-arc buckles into the grooves at the tops of the two semicircular steel pipes constituting the top reinforcement steel cylinder, and insert the short H-shaped steels between the adjacent connecting plates at the top;

[0015] Step S4: pouring concrete into the gap between the reinforced steel cylinder and the concrete column to be reinforced through the top opening of the top reinforced steel cylinder, and completing the reinforcement after the concrete solidifies and reaches the strength standard.

[0016] The present invention also includes another construction method for reinforcing a multi-constrained concrete column with a steel sleeve, which utilizes the above-mentioned steel sleeve to reinforce the multi-constrained concrete column connection structure, and includes the following steps:

[0017] Step S1: prefabricate semicircular steel pipes and steel tie ties in advance in the factory;

[0018] Step S2: transport the prefabricated semicircular steel pipes and steel tie ties to the reinforcement site, first clean the concrete column to be reinforced and the concrete floor slab thereunder, and first tie the steel tie ties on the concrete column to be reinforced at a certain interval;

[0019] Step S3: Then install the semicircular steel pipe from bottom to top, first fix two semi-arc buckles and two short H-shaped steels on the concrete slab, then insert the bottoms of the two semi-arc buckles that constitute the bottom reinforcement steel cylinder into the semi-arc buckles and the short H-shaped steels, then insert the arc buckles into the grooves at the top of the bottom reinforcement steel cylinder, insert the H-shaped steels between the adjacent connecting plates, and then pour concrete in the gap between the bottom reinforcement steel cylinder and the concrete column to be reinforced, and after the concrete solidifies and reaches the strength standard, assemble the middle reinforcement steel cylinder in sequence, and after each group of middle reinforcement steel cylinders is assembled, pour concrete in the gap between the middle reinforcement steel cylinder and the concrete column to be reinforced;

[0020] Step S4: Assemble the top reinforcement steel cylinder, insert two semi-arc clips into the top grooves of the two semicircular steel pipes that constitute the top reinforcement steel cylinder, insert short H-shaped steel between the adjacent top connecting plates, and pour concrete through the top opening of the top reinforcement steel cylinder so that the concrete fills the filling space between the concrete column to be reinforced and the top reinforcement steel cylinder. After the concrete solidifies and the strength reaches the standard, the reinforcement is completed.

[0021] Compared with the prior art, the present invention has the following significant advantages:

[0022] (1) Compared with the existing concrete column reinforcement, which has the disadvantages of poor reinforcement effect due to weak stress points such as the interface between new and old concrete, the interface between steel plate and concrete, and the interface between adhesive fiber reinforced composite material and concrete, the present invention uses steel tie bands to tie the concrete column to be reinforced, and uses arc buckles and H-shaped steel to constrain and connect multiple semi-circular steel sleeve units to form a reinforced steel cylinder. Through the lateral constraint of steel tie bands, connecting plates, and semi-circular steel pipes on concrete and the original concrete column, the internal concrete forms a three-dimensional compression state, which improves the bearing capacity and deformation capacity of the column, makes the reinforced steel cylinder, concrete and concrete column bear stress together, and reduces the disadvantage of poor reinforcement effect due to weak stress points on the interface between new and old concrete.

[0023] (2) Compared with the existing reinforcement, which requires complex construction processes such as supporting formwork, on-site welding, on-site bolting or sticking structural adhesives at the reinforcement site, the reinforced steel cylinder of the present invention can be prefabricated in the factory in advance. During construction, the materials for assembling the reinforced steel cylinder only need to be transported to the reinforcement site and then tied to the concrete column to be reinforced with steel ties. After the steel ties are tied, the reinforced steel cylinder is assembled outside the concrete column to be reinforced and concrete is poured. In this way, the construction is convenient, time-saving and labor-saving, and during the construction process, no support formwork, on-site welding, bolting or sticking structural adhesives are required.

[0024] (3) The present application divides the reinforced steel cylinder into a top reinforced steel cylinder, multiple sections of middle reinforced steel cylinder and a bottom reinforced steel cylinder along the concrete column to be reinforced, so that each section of the reinforced steel cylinder is small in size and convenient for transportation. In addition, no bolt connection or welding is required when the reinforced steel cylinders are assembled by themselves or connected to each other. It is only necessary to transport the materials for assembling the reinforced steel cylinders to the reinforcement site for horizontal assembly and vertical stacking and assembly, which saves manpower and material costs, provides construction safety, greatly improves construction speed and shortens the construction period.

[0025] (4) After assembling a section of reinforced steel cylinder, the present application can vibrate and compact the concrete poured in this section, and then stack and assemble it in sequence until the entire reinforced steel cylinder is assembled. This method of pouring and vibrating concrete while assembling can improve the density of concrete, eliminate the honeycomb surface of concrete, etc., improve the strength of concrete, and improve the reinforcement effect.

[0026] In summary, the present invention first ties steel ties at certain intervals in the vertical direction of the concrete column to be reinforced to complete the construction of the first constraint structure; then, around the reinforced concrete column to be reinforced, multiple semicircular steel sleeve units are assembled horizontally and then assembled vertically using (semi) arc buckles and (short) H-shaped steels to form a complete double-constrained reinforced steel cylinder, and the construction of the second and third constraint structures is completed at the same time; the concrete column to be reinforced and the reinforced steel cylinder form a filling space, and concrete is poured into the filling space, so that the steel ties, the double-constrained reinforced steel cylinder, the concrete and the original structural concrete column are subjected to force together. The prefabrication, transportation and construction of the accessories of the present invention are convenient, no on-site welding work is required, no bolt connection is required, and the manpower and material costs are low. At the same time, the construction method of the present invention has a triple constraint effect on the reinforced concrete column composed of steel ties and double-constrained reinforced steel cylinders. Compared with the existing steel casing reinforcement technology, it can better restrain the original concrete column and the newly poured concrete, so that they are subjected to stress together, which can greatly improve the bearing capacity and deformation capacity of the reinforced column and has a better reinforcement effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the elevation drawing of the concrete column to be reinforced.

[0028] Figure 2 This is the elevation view of the concrete column tied with steel ties.

[0029] Figure 3 This is the elevation view of the concrete column after full reinforcement.

[0030] Figure 4 yes Figure 3 Middle AA section view.

[0031] Figure 5 yes Figure 3 Middle BB cross-section.

[0032] Figure 6 yes Figure 4 Middle CC section.

[0033] Figure 7 yes Figure 4 Middle DD section view.

[0034] Figure 8 It is a plan view of the semicircular steel sleeve unit.

[0035] Fig. 9 yes Figure 8 EE section view of the middle semicircular steel sleeve unit.

[0036] Fig.10 It is a schematic diagram of the connecting plate in the semicircular steel sleeve unit.

[0037] Fig.11It is a top view of the arc buckle.

[0038] Fig.12 This is a front view of the arc buckle.

[0039] Fig.13 This is a front view of the semi-arc buckle.

[0040] In the attached figure: 1. semicircular steel pipe; 2. arc buckle; 21. arc plate; 22. radial plate; 23. top slot; 24. bottom slot; 3. semi-arc buckle; 4. concrete plate; 5. concrete column to be reinforced; 6. concrete; 7. H-shaped steel; 71. web; 8. connecting plate; 9. short H-shaped steel; 91. short web; 10. slot; 11. groove; 12. steel tie; 13. longitudinal stiffening rib; 14. circumferential stiffening rib. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] like Figures 1 to 12 As shown, the present invention provides a steel sleeve reinforced multi-constrained concrete column connection structure, including a semicircular steel pipe 1, an arc buckle 2, a semi-arc buckle 3, a concrete slab 4, a concrete column to be reinforced 5, concrete 6, an H-shaped steel 7, a web 71, a connecting plate 8, a short H-shaped steel 9, a short web 91, a slot 10, a groove 11, a steel tie 12, a longitudinal stiffening rib 13, and an annular stiffening rib 14.

[0044] like Figure 2-Figure 5As shown, the semicircular steel pipe 1, arc buckle 2, semi-arc buckle 3, H-shaped steel 7, connecting plate 8, short H-shaped steel 9, steel tie 12, longitudinal stiffening rib 13, and circumferential stiffening rib 14 are all prefabricated in the factory in advance, and the specific size is determined according to the actual reinforcement requirements and relevant specifications. A semicircular steel pipe 1 is connected with a connecting plate 8, two longitudinal stiffening ribs 13, and six circumferential stiffening ribs 14 (three each on the upper and lower sides) to form a set of semicircular steel sleeve units. Two sets of semicircular steel sleeve units are connected through arc buckle 2 or semi-arc buckle 3, H-shaped steel 7 or short H-shaped steel 9 to form a section of reinforced steel cylinder. Several sections of reinforced steel cylinders are connected through arc buckle 2 and H-shaped steel 7 to form a set of reinforced steel cylinders for the column.

[0045] like Figure 2 As shown, the material and size of the steel tie 12 are determined according to the reinforcement requirements and relevant specifications, and the arrangement spacing and quantity of the steel tie 12 are also determined according to the reinforcement requirements and relevant specifications. Figure 2 , Figure 4 As shown, the steel tie 12 forms the first constraint on the reinforced concrete column 5. When calculating its constraint effect, it is recommended to refer to the calculation method of the constraint effect of stirrups on concrete columns, that is, assuming that when the bearing capacity of the reinforced column is reached, the steel tie can yield under tension, so as to calculate its constraint effect.

[0046] like Fig.11 As shown, the arc buckle 2 includes an arc plate matching the arc of the semicircular steel tube 1 and a radial plate arranged on the center line of the arc plate along the axial direction and protruding radially along the arc plate. The heights of the arc plate and the radial plate match each other. The top and bottom of the arc plate and the radial plate and the center line along the length direction of the top and the bottom are respectively provided with a top slot and a bottom slot. The top slot of the arc plate and the top slot of the radial plate are connected to each other, and the bottom slot of the arc plate and the bottom slot of the radial plate are connected to each other. The width of the top and bottom slots of the arc plate matches the thickness of the semicircular steel tube 1, and the width of the top and bottom slots of the radial plate matches twice the thickness of the longitudinal stiffening rib 13. During assembly, the upper semicircular steel tube 1 and the longitudinal stiffening rib 13 inside the semicircular steel tube 1 are inserted into the top slot of the arc buckle 2, and the lower semicircular steel tube 1 and the longitudinal stiffening rib 13 are inserted into the bottom slot of the arc buckle 2, so that the upper and lower semicircular steel tubes 1 are constrained in the radial direction by the arc buckle 2. Fig.13 As shown, the semi-arc buckle 3 is half of the arc buckle 2, that is, it only has a bottom slot or a top slot.

[0047] Preferably, steel is selected as the material for the arc buckle 2, the semi-arc buckle 3, the connecting plate 8, the longitudinal stiffening rib 13, and the annular stiffening rib 14, and the specific dimensions are designed according to the actual reinforcement conditions and specifications.

[0048] like Figure 8 , Fig. 9 As shown, the semicircular steel pipe 1 is connected with the connecting plate 8, the longitudinal stiffening ribs 13, and the annular stiffening ribs 14 in advance in the processing plant; the inner walls of both ends of the semicircular steel pipe 1 are fixed with radially protruding longitudinal stiffening ribs 13, and the inner wall of the semicircular steel pipe 1 is fixed with a connecting plate 8 parallel to the longitudinal stiffening ribs 13, and the spacing between the connecting plate 8 and the longitudinal stiffening ribs 13 is not less than the radius of the concrete column 5 to be reinforced, and the top and bottom of the connecting plate 8 near the two ends are provided with axially arranged The slot 10 is provided, and the spacing between the two slots 10 on the same side is not less than the diameter of the concrete column 5 to be reinforced. The depth of the slot 10 is half the height of the web 71 of the H-shaped steel 7. When the semicircular steel pipe 1 is connected, the connecting plate 8 in the semicircular steel pipe 1 is connected by the H-shaped steel 7 inserted in the slot 10. The H-shaped steel 7 includes a web 71 and wing plates at both ends of the web 71. The length of the web 71 matches the spacing between the back sides of the connecting plates 8 in the semicircular steel pipe 1.

[0049] Annular stiffening ribs 14 arranged along the circumferential direction are fixed on the inner walls of the top and bottom of the semicircular steel tube 1, between the longitudinal stiffening ribs 13 and the connecting plate 8, and between the two ends of the connecting plate 8. A gap matching the arc buckle 2 and the semi-arc buckle 3 is provided between the annular stiffening ribs 14 and the longitudinal stiffening ribs 13.

[0050] In this embodiment, each group of annular stiffening ribs is evenly arranged along the axial direction of the semicircular steel pipe 1, and the heights of the semicircular steel pipe 1, the connecting plate 8 and the longitudinal stiffening ribs 13 are matched; preferably, welding is selected as the connection method between the semicircular steel pipe 1 and the connecting plate 8, the longitudinal stiffening ribs 13 and the annular stiffening ribs 14.

[0051] like Fig. 9 As shown, the height of the semicircular steel pipe 1 can be a multiple of the building modulus of the concrete column 5 to be reinforced, so that the components required for reinforcement can be produced in sets. The prefabricated quantity of the semicircular steel pipe 1, the arc buckle 2, the connecting plate 8, the H-shaped steel 7, the longitudinal stiffening rib 13, and the annular stiffening rib 14 is determined according to the actual reinforcement requirements and the height of the semicircular steel pipe 1.

[0052] like Figure 8 , Fig. 9 As shown, the manufacturing method of the set of semicircular steel sleeve units is as follows:

[0053] (1) First, a semicircular steel tube 1 is made: a circular cross-section steel tube is cut in half to form a semicircular steel tube 1, and then grooves 11 are symmetrically cut on the top and bottom surfaces of both ends of the semicircular steel tube 1. The height of the groove 11 is half of the bottom spacing between the bottom slot 24 and the top slot 23 of the arc buckle 2, so that it is convenient to place the arc buckle 2 during subsequent assembly, and no gap is left after the upper and lower semicircular steel tubes 1 are connected;

[0054] (2) The connecting plate 8 is prefabricated in the factory. Two slots 10 should be opened on the upper and lower edges of the connecting plate 8 respectively. The slots 10 on the upper and lower edges should be at the same vertical position to facilitate the placement of the web 71 of the H-beam 7 during subsequent assembly. The width and depth of the slots 10 are determined according to the thickness of the web 71 of the H-beam 7 and the length of the H-beam 7 respectively; the depth of the slots 10 is preferably half the length of the H-beam 7, so that half of the H-beam 7 can be placed in the slots 10 on the connecting plate 8 in the upper and lower steel casing units 1 during subsequent assembly to constrain the upper and lower connecting plates 8. Figure 6 As shown, in order to facilitate batch production of components, the short H-shaped steel 9 arranged at the top and bottom of a complete set of column reinforcement steel cylinders is half the length of the H-shaped steel 7; the semi-arc buckle 3 arranged at the top and bottom of a complete set of column reinforcement steel cylinders is half the length of the arc buckle 2.

[0055] After the semicircular steel pipe 1 and the connecting plate 8 are manufactured, the prefabricated connecting plate 8 is welded to the semicircular steel pipe 1. The welding position of the connecting plate 8 needs to consider that there is enough space between the connecting plate 8 and the concrete column 5 to be reinforced to ensure that the connecting plate 8 and the concrete column 5 to be reinforced will not interfere with each other during installation;

[0056] (3) The two prefabricated longitudinal stiffening ribs 13 are welded to the two ends of the semicircular steel pipe 1 in the circumferential direction. The upper and lower heights of the longitudinal stiffening ribs 13 are flush with the bottom of the groove 11 of the semicircular steel pipe 1. The width and thickness of the longitudinal stiffening ribs 13 are determined by calculation according to the actual stress conditions. The longitudinal stiffening ribs 13 are arranged along the axial direction of the semicircular steel pipe 1. The function of the longitudinal stiffening ribs 13 is to enhance the bearing capacity of the steel pipe connection and prevent the steel pipe from being buckled and damaged under compression.

[0057] (4) The six prefabricated annular stiffening ribs 14 are welded to the semicircular steel tube 1. The size of the annular stiffening ribs 14 is determined by calculation based on the actual stress conditions. The annular stiffening ribs 14 are respectively placed at the upper and lower ends of the semicircular steel tube 1 and flush with the upper and lower end surfaces of the semicircular steel tube 1. Space must be reserved at the position where the arc buckle 2 is placed on the semicircular steel tube 1 and at the position where the H-shaped steel 7 is placed on the connecting plate 8, so as to facilitate the placement of the arc buckle 2 and the H-shaped steel 7 for assembly and connection during subsequent assembly. The annular stiffening ribs 14 can increase the contact area of ​​the edges of the upper and lower semicircular connector units, thereby improving the bearing capacity and stability of the edges of the semicircular steel tubes.

[0058] like Figure 4 , Figure 5 As shown, the web 71 of the H-shaped steel 7 is placed in the slot 10 of the connecting plate 8, and a restraint area is formed by restraining the connecting plate 8 in the upper and lower semicircular steel sleeve units, which provides restraint for the reinforced concrete column 5 and the internal concrete 6, which is the second restraint effect; Figure 4 , Figure 5As shown, the arc-shaped clip 2 is placed at the edge groove 11 where two sets of semicircular steel sleeve units are connected to each other, connecting and constraining the semicircular steel pipe 1 and the longitudinal stiffening rib 13, transmitting the circumferential tension of the semicircular steel pipe 1, thereby providing constraints for the concrete column 5 to be reinforced and the internal concrete 6, which is the third constraint.

[0059] The specific reinforcement process is as follows:

[0060] The prefabricated semicircular steel pipe 1, arc buckle 2, semi-arc buckle 3, H-shaped steel 7, short H-shaped steel 9, and steel tie 12 are transported to the reinforcement site, the concrete column 5 to be reinforced and the concrete floor 4 thereunder are cleaned, and the steel tie 12 is first tied to the concrete column 5 to be reinforced at a certain interval;

[0061] Then install the semicircular steel pipe 1 from bottom to top, first fix two semi-arc buckles 3 and two short H-shaped steels 9 on the concrete slab 4, then insert the bottoms of the two semicircular steel pipes 1 into the semi-arc buckles 3 and the short H-shaped steels 9, then insert the arc buckles 2 into the grooves 11 at the tops of the two semicircular steel pipes 1, and insert the H-shaped steels 7 between the adjacent connecting plates 8, so as to assemble and connect upwards;

[0062] Finally, two semi-arc buckles 3 are inserted into the top grooves 11 of the last two semicircular steel pipes 1 at the top, and short H-shaped steels 9 are inserted between adjacent connecting plates 8 to complete the installation of the entire column reinforcement steel cylinder.

[0063] The above is the connection process of the semicircular steel pipe 1, and there are two ways to pour concrete 6:

[0064] The first method is to pour concrete 6 after each section of semicircular steel pipe 1 is connected to form a section of reinforced steel cylinder. After vibrating and compacting, continue to stack semicircular steel pipes 1 upwards, and then continue to pour concrete 6 and vibrate and compact until the entire set of column reinforcement steel cylinder assembly and pouring is completed.

[0065] The second method is to first assemble and reinforce all the semicircular steel pipes 1, and then pour concrete 6 downward above the filling space formed by the semicircular steel pipes 1 and the concrete column 5 to be reinforced, and the reinforcement is completed after the strength of the concrete 6 reaches the standard.

[0066] In this embodiment, the first method is preferred, and the concrete 6 is poured several times. After each pouring, the concrete 6 is vibrated and compacted by a vibrating rod, and then the next pouring is continued. After the reinforcement is completed, an anti-rust paint layer is provided around the entire column reinforcement steel cylinder to prevent the steel from rusting.

[0067] Embodiment 1:

[0068] The present invention also includes a construction method for reinforcing a multi-constrained concrete column with a steel sleeve.

[0069] Step S1: prefabricate semicircular steel pipes, connecting plates, longitudinal stiffening ribs, circumferential stiffening ribs, arc buckles, semi-arc buckles, H-shaped steel, short H-shaped steel, and steel tie bands in advance in the factory. Connect the semicircular steel pipes with the connecting plates, longitudinal stiffening ribs, and circumferential stiffening ribs in advance to form a semicircular steel sleeve unit;

[0070] Step S2: Determine the position to be reinforced, and transport several sets of semi-circular steel sleeve units, H-shaped steel, arc buckles and two sets of semi-arc buckles, two sets of short H-shaped steel, and several steel cable ties to the reinforcement site;

[0071] Step S3: clean the surface of the concrete column to be reinforced and the concrete floor below, first tie steel ties on the concrete column to be reinforced at a certain interval, then determine the pre-placement position of the semi-circular steel sleeve unit, first fix two semi-arc buckles and two short H-shaped steels on the concrete slab, and then insert the lower areas of the two sets of semi-arc buckles and short H-shaped steels into the semi-arc buckles and short H-shaped steels;

[0072] Step S4: Then place two arc-shaped clips and two H-shaped steels in the upper connection area of ​​the two sets of semicircular steel sleeve units, constrain the semicircular steel sleeve units to form a reinforced steel cylinder, and then pour concrete into it. After vibrating and compacting, continue to put on two sets of semicircular steel sleeve units, and so on.

[0073] Step S5: When placing the last two sets of semicircular steel sleeve units at the top, insert the lower areas of the two sets of semicircular steel sleeve units into the arc buckles and H-shaped steel that have been buckled in the upper areas of the first two sets of semicircular steel sleeve units, and then place two semi-arc buckles and two short H-shaped steels in the upper areas of the two sets of semicircular steel sleeve units to constrain and connect them, completing the installation of the entire column reinforcement steel cylinder. Then pour concrete into the top reinforcement steel cylinder, and the pouring is completed after vibrating and compacting, and the reinforcement is completed after the concrete strength reaches the standard.

[0074] Step S6: After the reinforcement is completed, anti-rust paint is applied to the outer periphery of the column reinforcement steel cylinder to prevent the reinforcement steel casing from corrosion and rust.

[0075] Embodiment 2:

[0076] The present embodiment is different from the embodiment 1 in that the semicircular steel pipe 1 is first completely assembled and reinforced, and then concrete 6 is poured downwardly above the filling space formed by the semicircular steel pipe 1 and the concrete column 5 to be reinforced, and the reinforcement is completed when the strength of the concrete 6 reaches the standard.

[0077] Step S1: prefabricate semicircular steel pipes, connecting plates, longitudinal stiffening ribs, circumferential stiffening ribs, arc buckles, semi-arc buckles, H-shaped steel, short H-shaped steel, and steel tie bands in advance in the factory. Connect the semicircular steel pipes with the connecting plates, longitudinal stiffening ribs, and circumferential stiffening ribs in advance to form a semicircular steel sleeve unit;

[0078] Step S2: Determine the position to be reinforced, and transport several sets of semi-circular steel sleeve units, H-shaped steel, arc buckles and two semi-arc buckles, two short H-shaped steels, and several steel cable ties to the reinforcement site;

[0079] Step S3: clean the surface of the concrete column to be reinforced and the concrete floor below, first tie steel ties on the concrete column to be reinforced at a certain interval, then determine the pre-placement position of the semi-circular steel sleeve unit, first fix two semi-arc buckles and two short H-shaped steels on the concrete slab, and then insert the lower areas of the two sets of semi-arc buckles and short H-shaped steels into the semi-arc buckles and short H-shaped steels;

[0080] Step S4: Then place two arc clips and H-shaped steel in the upper connection area of ​​the two sets of semicircular steel sleeve units to constrain the connection of the semicircular steel sleeve units to form a section of reinforced steel cylinder; then continue to place two sets of semicircular steel sleeve units on the front two arc clips and H-shaped steel, and so on.

[0081] Step S5: When placing the last two sets of semicircular steel sleeve units at the top, insert the lower areas of the two sets of semicircular steel sleeve units into the arc buckles and H-shaped steels that have been buckled in the upper areas of the first two sets of semicircular steel sleeve units, and then place two semi-arc buckles and two short H-shaped steels in the upper areas of the two sets of semicircular steel sleeve units to constrain and connect them, completing the installation of the entire column reinforcement steel cylinder. Then pour concrete downward above the filling space formed by the reinforced steel cylinder and the concrete column to be reinforced, and the reinforcement is completed when the concrete strength reaches the standard.

[0082] Step S6: After the reinforcement is completed, anti-rust paint is applied to the outer periphery of the column reinforcement steel cylinder to prevent the reinforcement steel casing from corrosion and rust.

[0083] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A steel sleeve reinforced multi-constrained concrete column connection structure, characterized in that: The invention comprises a reinforcing steel cylinder which is sleeved on the outside of a concrete column (5) to be reinforced, wherein a plurality of steel tie bands (12) are fixed axially on the outside of the concrete column (5) to be reinforced, wherein the reinforcing steel cylinder comprises a top reinforcing steel cylinder, a bottom reinforcing steel cylinder and a plurality of sections of middle reinforcing steel cylinder arranged between the top reinforcing steel cylinder and the bottom reinforcing steel cylinder, and the height of the top reinforcing steel cylinder, the plurality of sections of middle reinforcing steel cylinder and the bottom reinforcing steel cylinder after being connected matches the height of the concrete column (5) to be reinforced. The top reinforcing steel cylinder, the middle reinforcing steel cylinder and the bottom reinforcing steel cylinder have the same structure and are assembled from two semicircular steel pipes (1). The top reinforcing steel cylinder and the middle reinforcing steel cylinder, the adjacent middle reinforcing steel cylinders and the bottom reinforcing steel cylinders of the middle reinforcing steel cylinders are connected by arc buckles (2) and H-shaped steels (7). Concrete (6) is poured in the gaps between the top reinforcing steel cylinder, the middle reinforcing steel cylinder and the bottom reinforcing steel cylinder and the concrete column (5) to be reinforced.

2. The steel sleeve reinforced multi-constrained concrete column connection structure according to claim 1 is characterized in that: The semicircular steel tube (1) is symmetrically provided with grooves (11) on the top and bottom surfaces at both ends in the circumferential direction, and the size and depth of the grooves (11) match the arc buckle (2). The semicircular steel tube (1) is fixed with radially protruding longitudinal stiffening ribs (13) at both ends in the circumferential direction. The longitudinal stiffening ribs (13) are arranged axially along the semicircular steel tube (1), and the two ends of the longitudinal stiffening ribs (13) are flush with the bottom of the grooves (11) at both ends of the semicircular steel tube (1). A connecting plate (8) arranged parallel to the longitudinal stiffening ribs (13) is fixed on the inner wall of the semicircular steel tube (1). The distance between the connecting plate (8) and the longitudinal stiffening rib (13) is not less than the radius of the concrete column (5) to be reinforced. The top and bottom of the connecting plate (8) are provided with axially arranged grooves (10) near the two ends thereof. The distance between the two grooves (10) on the same side of the connecting plate (8) is not less than the diameter of the concrete column (5) to be reinforced. The depth of the groove (10) is not less than half the height of the web (71) of the H-shaped steel (7) and not greater than the height of the web (71) of the H-shaped steel (7). The width of the groove (10) matches the thickness of the web (71) of the H-shaped steel (7).

3. The steel sleeve reinforced multi-constrained concrete column connection structure according to claim 2 is characterized in that: The arc buckle (2) comprises an arc plate (21) matching the arc of the semicircular steel tube (1) and a radial plate (22) arranged on the center line of the arc plate (21) arranged axially and protruding radially along the arc plate (21), the distance between the radial plate (22) and the end of the arc plate (21) matches the length of the groove (11), the top surface and the bottom surface of the arc plate (21) and the radial plate (22) and the center line along the length direction of the top surface and the bottom surface are respectively provided with a top slot (23) and a bottom slot (24), the depth of the top slot (23) and the bottom slot (24) being 1.3mm and 1.5mm, respectively. The arc plate (21) and the radial plate (22) are of the same degree, and the top slot of the arc plate (21) and the top slot of the radial plate (22) are interconnected, the bottom slot of the arc plate (21) and the bottom slot of the radial plate (22) are interconnected, the width of the top slot and the bottom slot of the arc plate (21) match the thickness of the semicircular steel pipe (1), the width of the top slot and the bottom slot of the radial plate (22) match twice the thickness of the longitudinal stiffening rib (13), and the thickness of the middle partition between the top slot (23) and the bottom slot (24) of the arc buckle (2) is twice the depth of the groove (11).

4. The steel sleeve reinforced multi-constrained concrete column connection structure according to claim 3 is characterized in that: The H-shaped steel (7) comprises a web (71) and wing plates arranged at both ends of the web (71), and the length of the web (71) matches the distance between the opposite sides of two connecting plates (8) in the semicircular steel tube (1).

5. The steel sleeve reinforced multi-constrained concrete column connection structure according to claim 4, characterized in that: The height of the web (71) of the H-shaped steel (7) is twice the depth of the clamping groove (10).

6. The steel sleeve reinforced multi-constrained concrete column connection structure according to claim 5, characterized in that: The tops of the two semicircular steel tubes (1) constituting the top reinforcement steel cylinder are connected to the top surface through a semi-arc buckle (3) and a short H-shaped steel (9), and the bottom reinforcement steel cylinder is connected to the ground where the concrete column (5) to be reinforced is located through the semi-arc buckle (3) and the short H-shaped steel (9), the semi-arc buckle (3) comprises a semi-arc plate matching the curvature of the semi-arc steel tube (1) and a radial plate arranged on the center line of the semi-arc plate along the axial direction and protruding radially along the semi-arc plate, the height of the semi-arc plate and the radial plate is half the height of the arc plate (21) and the radial plate (22), the distance from the radial plate to the end of the semi-arc plate matches the length of the groove (11), the top surface or bottom surface of the semi-arc plate and the radial plate, and the center line along the length direction of the top surface or the bottom surface are divided A first slot is separately provided, the first slot of the semi-arc plate and the first slot of the radius plate are connected to each other, the first slot has the same depth as the top slot (23) of the arc buckle (2), the width of the first slot of the semi-arc plate matches the thickness of the semicircular steel pipe (1), the width of the first slot of the radius plate matches twice the thickness of the longitudinal stiffening rib (13), the bottom plate thickness of the arc buckle (2) matches the depth of the groove (11), the short H-shaped steel (9) includes a short web (91) and short wing plates arranged at both ends of the short web (91), the length of the short web (91) is the same as the length of the web (71) of the H-shaped steel (7), the height of the short wing plate and the height of the short web (91) are half the height of the web (71) of the H-shaped steel.

7. A construction method for reinforcing a multi-constrained concrete column with a steel sleeve, using the steel sleeve reinforced multi-constrained concrete column connection structure according to any one of claims 1 to 6, characterized in that: The specific steps include: Step S1: prefabricate semicircular steel pipes and steel tie ties in advance in the factory; Step S2: transport the prefabricated semicircular steel pipes and steel tie ties to the reinforcement site, first clean the concrete column to be reinforced and the concrete floor slab thereunder, and first tie the steel tie ties on the concrete column to be reinforced at a certain interval; Step S3: Then install the semicircular steel pipe from bottom to top, first fix two semi-arc buckles and two short H-shaped steels on the concrete slab, then insert the bottoms of the two semicircular steel pipes constituting the bottom reinforcement steel cylinder into the semi-arc buckles and the short H-shaped steels, then insert the arc buckles into the grooves at the top of the bottom reinforcement steel cylinder, insert the H-shaped steels between the adjacent connecting plates, and then assemble multiple groups of middle reinforcement steel cylinders and top reinforcement steel cylinders in sequence; finally, insert two semi-arc buckles into the grooves at the tops of the two semicircular steel pipes constituting the top reinforcement steel cylinder, and insert the short H-shaped steels between the adjacent connecting plates at the top; Step S4: pouring concrete into the gap between the reinforced steel cylinder and the concrete column to be reinforced through the top opening of the top reinforced steel cylinder, and completing the reinforcement after the concrete solidifies and reaches the strength standard.

8. A construction method for reinforcing a multi-constrained concrete column with a steel sleeve, using the steel sleeve reinforced multi-constrained concrete column connection structure according to any one of claims 1 to 6, characterized in that: The specific steps include: Step S1: prefabricate semicircular steel pipes and steel tie ties in advance in the factory; Step S2: transport the prefabricated semicircular steel pipes and steel tie ties to the reinforcement site, first clean the concrete column to be reinforced and the concrete floor slab thereunder, and first tie the steel tie ties on the concrete column to be reinforced at a certain interval; Step S3: Then install the semicircular steel pipe from bottom to top, first fix two semi-arc buckles and two short H-shaped steels on the concrete slab, then insert the bottoms of the two semi-arc buckles that constitute the bottom reinforcement steel cylinder into the semi-arc buckles and the short H-shaped steels, then insert the arc buckles into the grooves at the top of the bottom reinforcement steel cylinder, insert the H-shaped steels between the adjacent connecting plates, and then pour concrete in the gap between the bottom reinforcement steel cylinder and the concrete column to be reinforced, and after the concrete solidifies and reaches the strength standard, assemble the middle reinforcement steel cylinder in sequence, and after each group of middle reinforcement steel cylinders is assembled, pour concrete in the gap between the middle reinforcement steel cylinder and the concrete column to be reinforced; Step S4: Assemble the top reinforcement steel cylinder, insert two semi-arc clips into the top grooves of the two semicircular steel pipes that constitute the top reinforcement steel cylinder, insert short H-shaped steel between the adjacent top connecting plates, and pour concrete through the top opening of the top reinforcement steel cylinder so that the concrete fills the filling space between the concrete column to be reinforced and the top reinforcement steel cylinder. After the concrete solidifies and the strength reaches the standard, the reinforcement is completed.

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