# US 11,028,574 B2 · Steel-plate-encased precast concrete column foot joint and construction method therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,574 B2 - Document ID: US11028574B2 - Status: Granted - Kind: B2 - Application number: 16/699,837 - Filed: 2019-12-02 - Published: 2020-04-09 - Granted: 2021-06-08 - Earliest claimed: 2017-06-02 - Applicants: China State Construction Engineering Corporation Limited - Inventors: Haishan Guo; Liming Li; Hu Qi; Xin Fan; Dongyan Wang; Jiao Geng; Lida Tian; Kang Liu; Ming Li; Tong Li; Yonglan Xie - Web page: https://patentgrep.com/patent/US11028574B2 ## CPC - E04B 1/21: Connections specially adapted therefor - E04C 3/34: of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings (E04C3/36 takes precedence) - E04G 23/0218: {Increasing or restoring the load-bearing capacity of building construction elements (E04G23/0203 and E04G23/0266 take precedence)} - E04H 9/025: {Structures with concrete columns} - E04B: GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS (border constructions of opening in walls, floors or ceilings E06B1/00; {electromagnetic shielding H05K9/0001}) - E04C: STRUCTURAL ELEMENTS; BUILDING MATERIALS (for bridges E01D; specially designed for insulation or other protection E04B; elements used as building aids E04G; for mining E21; for tunnels E21D; structural elements with broader range of application than for building engineering F16, particularly F16S) - E04G: SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS - E04H: BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL (foundations E02D) ## Abstract The column-base joint includes a prefabricated-reinforced-concrete column and a reinforced-concrete foundation, and further includes a coating-steel-plate sleeve that is integrally prefabricated with the concrete column and encloses an exterior of a column base. A gap is between a bottom end of the coating-steel-plate sleeve and an upper surface of the foundation. An outside of the gap is provided with a plugging material. The joint further includes an annular rib plate all of whose edges are horizontally and seamlessly connected to an inner wall of the coating-steel-plate sleeve and whose middle portion is provided with a rib-plate opening. The annular rib plate is provided with a sleeve opening that matches with the grouting sleeve device. ## Claims ### Claim 1 A steel-plate-coated assembled concrete column-base joint, comprising a prefabricated-reinforced-concrete column (2) at an upper portion and a reinforced-concrete foundation (1) at a lower portion that are vertically correspondingly spliced, the prefabricated-reinforced-concrete column (2) being pre-buried with an internal-to-column longitudinal bar (4), an internal-to-column stirrup (5) and a grouting sleeve device (6) that are circumferentially evenly distributed along a column body, the reinforced-concrete foundation (1) being pre-buried with a foundation anchoring-insertion steel bar (12), the foundation anchoring-insertion steel bar (12) being connected to the internal-to-column longitudinal bar (4) via a grout-injection material (13) filling the grouting sleeve device (6), and a splicing seam between the reinforced-concrete foundation (1) and the prefabricated-reinforced-concrete column (2) being filled with the grout-injection material (13), wherein the joint further comprises a coating-steel-plate sleeve (7) that is integrally prefabricated with the concrete column and encloses an exterior of a column base, a top end of the coating-steel-plate sleeve (7) is below a grout-injection hole and a grout exiting hole of the grouting sleeve device, a gap is between a bottom end of the coating-steel-plate sleeve (7) and an upper surface of the foundation, and an outside of the gap is provided with a plugging material (3), and the joint further comprises an annular rib plate (8) all of whose edges are horizontally and seamlessly connected to an inner wall of the coating-steel-plate sleeve (7) and whose middle portion is provided with a rib-plate opening (81), the annular rib plate (8) is located at a bottom of the coating-steel-plate sleeve and is above the bottom end of the coating-steel-plate sleeve (7) to leave a steel-plate-cylinder rim, the steel-plate-cylinder rim, the annular rib plate (8), the plugging material (3) and the upper surface of the foundation form a closed splicing-seam cavity, the annular rib plate is provided with a sleeve opening (82) that matches with the grouting sleeve device (6), the grouting sleeve device (6) sequentially passes through the sleeve opening (82) and protrudes into the splicing-seam cavity, a bottom side face of the grouting sleeve device (6) flushes with a bottom side face of the coating-steel-plate sleeve (7), and the splicing-seam cavity is filled with the grout-injection material (13). ### Claim 2 (depends on 1) The steel-plate-coated assembled concrete column-base joint according to claim 1, wherein the coating-steel-plate sleeve (7) has a height 1-3 times of a length of a long side of a cross section of the column, and a thickness of 1.0-30 mm, and is made of Q235B or Q345B steel. ### Claim 3 (depends on 1) The steel-plate-coated assembled concrete column-base joint according to claim 1, wherein an outer side surface of the coating-steel-plate sleeve (7) flushes with or protrudes from an outer side surface of the prefabricated-reinforced-concrete column (2). ### Claim 4 (depends on 1) The steel-plate-coated assembled concrete column-base joint according to claim 1, wherein the internal-to-column stirrup (5) is provided with a densified region from a column bottom end to a position that is above an upper end of the coating-steel-plate sleeve (7) and is 0.5-1 time of a length of a long side of a cross section of the column. ### Claim 5 (depends on 1) The steel-plate-coated assembled concrete column-base joint according to claim 1, wherein the rib-plate opening (81) of the prefabricated-reinforced-concrete column (2) is prefabricated with a coarse-surface layer (10) flushing with the annular rib plate (8), or the bottom of the prefabricated-reinforced-concrete column (2) is integrally prefabricated with a shear key body (11), the shear key body (11) is enclosed by the grouting sleeve device (6) and flushes with the bottom end of the coating-steel-plate sleeve (7), and a middle portion of the shear key body (11) is of a concave funnel shape. ### Claim 6 (depends on 1) The steel-plate-coated assembled concrete column-base joint according to claim 1, wherein the grouting sleeve device (6) is a first sleeve that is provided with a non-independent grout-injection hole (61) and an independent grout exiting hole (63), wherein the grout-injection materials (13) within the first sleeve and the splicing-seam cavity are integrally poured, or a second sleeve that is provided with an independent grout-injection hole (62) and an independent grout exiting hole (63), wherein the grout-injection materials (13) within the second sleeve and the splicing-seam cavity are separately poured, and the independent grout-injection hole (62) and the independent grout exiting hole (63) are in communication with the sleeve via a corresponding grout-injection pipe buried within the column. ### Claim 7 (depends on 6) The steel-plate-coated assembled concrete column-base joint according to claim 6, wherein the non-independent grout-injection hole (61) is located at a column side wall, the non-independent grout-injection hole (61) and the splicing-seam cavity are in communication via an internal-to-column grout flowing pipeline (9), the internal-to-column grout flowing pipeline is located inside the prefabricated-reinforced-concrete column (2), with one end in communication with the independent grout-injection hole (61), and the other end passing through the annular rib plate and in communication with the splicing-seam cavity, the splicing-seam cavity forms an external-to-column grout flowing pipeline of the grouting sleeve device (6), and a movement trajectory of the grout-injection material (13) of the first sleeve is from the non-independent grout-injection hole (61), the internal-to-column grout flowing pipeline (9) and the external-to-column grout flowing pipeline to the sleeves and flows out of the independent grout exiting hole (63). ### Claim 8 (depends on 7) The steel-plate-coated assembled concrete column-base joint according to claim 7, wherein the internal-to-column grout flowing pipeline (9) is a metal bellows buried within the column or a pipeline integrally prefabricated with the column, the internal-to-column grout flowing pipeline (9) is of a reverse L shape, and comprises a horizontal pipeline (91) and a vertical pipeline (92), the horizontal pipeline (91) is in communication with an exterior of the side wall and has an inclination angle relative to the side wall, and the vertical pipeline (92) is in communication with the splicing-seam cavity. ### Claim 9 (depends on 7) The steel-plate-coated assembled concrete column-base joint according to claim 7, wherein a middle portion of the coarse-surface layer (10) and a middle portion of the shear key body (11) are provided with a grout-injection hole opening (14) of the internal-to-column grout flowing pipeline. ### Claim 10 (depends on 1) A method for constructing the steel-plate-coated assembled concrete column-base joint according to claim 1, wherein steps of the constructing are as follows: Step 1: in a plant fixedly connecting the internal-to-column longitudinal bar (4), the internal-to-column stirrup (5) and the grouting sleeve device (6) and binding into a steel reinforcement cage; Step 2: in a plant welding four steel plates into the rectangular coating-steel-plate sleeve (7), opening the sleeve opening (82) corresponding to the grouting sleeve device (6) at the annular rib plate (8), and then fixing by welding the annular rib plate (8) to the inner wall of the coating-steel-plate sleeve (7) by fillet weld; Step 3: inserting the steel reinforcement cage manufactured in the Step 1 into the coating-steel-plate sleeve (7) manufactured in the Step 2, and after the grouting sleeve device (6) has been accurately inserted into the sleeve opening (82) to be integral, placing together into a column-body template; Step 4: pouring concrete into the column-body template, at which time point plant manufacturing of the prefabricated-reinforced-concrete column (2) is completed, and transporting the prefabricated-reinforced-concrete column (2) to a construction site; Step 5: after constructing of the foundation has been completed, inserting the foundation anchoring-insertion steel bar (12) into the grouting sleeve device (6) in the prefabricated-reinforced-concrete column (2), temporarily fixing, sealing the splicing-seam cavity by using the plugging material (3), and fixing the prefabricated-reinforced-concrete column (2) by using a temporary support; Step 6: preparing the grout-injection material (13), injecting the grout-injection material from the grout-injection hole, the grout-injection material flowing out of the grout exiting hole, and depending on the form of the sleeve, the grout-injection material integrally or separately filling the splicing-seam cavity and the sleeve, at which time point the grout injection ends; and Step 7: after the grout-injection material (13) has coagulated to a certain strength, dismantling the temporary support of the prefabricated-reinforced-concrete column, to complete the constructing of the column-base joint.