PEC component vertical splicing joint and construction method

Abstract

The invention relates to the field of fabricated buildings, in particular to a PEC component vertical splicing joint and a construction method.The splicing joint comprises an upper PEC component and a lower PEC component, hoop type connectors are installed at the longitudinal bar connecting ends of the upper PEC component and the lower PEC component respectively, a web and a flange of the upper PEC component are unequal in length, and a horizontal connecting end plate is welded to the bottom of the web of the upper PEC component; longitudinal bar penetrating holes are formed in the connecting end plate, two clamping plates with holes are vertically welded to the bottom of the connecting end plate, transverse steel sleeves are welded to the holes in the outer walls of the two clamping plates, and concrete is poured on the two sides of a web of the upper PEC component and the lower portion of the connecting end plate in advance. A web of the lower PEC member is longer than a flange by a section to serve as a connecting plate, a hole is formed in the connecting plate, when the upper PEC member and the lower PEC member are vertically spliced, the top face of the lower PEC member is coated with structural adhesive, the connecting plate is inserted between the two clamping plates, the torsional shear type high-strength bolts are arranged in the steel sleeves to fix the connecting plate and the clamping plates, and the longitudinal bars are mutually inserted and fixed through the hoop type connectors.

Description

Technical Field

[0001] The present invention relates to the field of prefabricated buildings, and in particular to a PEC component vertical splicing node and a construction method. Background Art

[0002] Partially encased steel-concrete composite components (PEC components) are a new type of steel-concrete composite component. Their interior consists of an H-shaped steel skeleton, with longitudinal reinforcement and stirrups on either side of the web. Concrete is pre-cast on both sides of the web in the factory. In the prior art, when PEC components are vertically spliced, taking the vertical connection of PEC columns as an example, the upper and lower columns are typically prefabricated in the factory, leaving a node area at the connection end without pre-casting concrete. Instead, the flanges and webs of the upper and lower columns are connected together at the construction site through bolt welding or full welding. The longitudinal reinforcement of the upper and lower columns is then welded together, and finally, high-strength concrete is poured on-site in the node area. This traditional connection method involves a lot of on-site welding work, making quality difficult to guarantee. It also requires wet working, which impacts construction progress.

[0003] In order to improve the series of problems caused by on-site pouring of the node area during the vertical splicing of the above-mentioned PEC components, many designers have proposed various PEC component vertical splicing connection nodes that do not require pouring. Although the on-site pouring operation is omitted, in order to meet the upper and lower force transmission effects and force requirements of the node area, various stiffening plates need to be welded on-site in the node area, resulting in an increase in the use of steel and discontinuous force transmission of the concrete of the upper and lower columns. Summary of the Invention

[0004] The present invention first discloses a vertical splicing node for PEC components, which not only eliminates the need for on-site post-casting of concrete in the node area, but also ensures continuous force transmission between the concrete of the upper and lower PEC components and avoids on-site welding of the longitudinal reinforcement of the upper and lower PEC components, thus simplifying the node operation as a whole and improving the installation efficiency.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: A PEC component vertical splicing node includes an upper PEC component and a lower PEC component; The bottom surface of the web of the upper PEC member is higher than the bottom surface of the flange of the upper PEC member. The bottom surface of the web of the upper PEC member is welded with a connecting end plate, which is perpendicular to the web and connected to the flange. A longitudinal reinforcement through-hole is provided on the connecting end plate. Two plywoods are welded on the bottom surface of the connecting end plate perpendicular to the connecting end plate. The bottom surface of the plywood is flush with the bottom surface of the flange of the upper PEC member. The two plywoods are parallel to the web and spaced apart. Holes are symmetrically opened on the two plywoods. Steel sleeves are welded on the outer walls of the two plywoods corresponding to the holes. The steel sleeves are perpendicular to the plywoods. Longitudinal reinforcements are provided on both sides of the web of the upper PEC member. The longitudinal reinforcements of the upper PEC member pass through the longitudinal reinforcement through-holes. The bottom end of the longitudinal reinforcement of the upper PEC member is fixedly connected to a male clamp-type connector. The bottom of the male clamp-type connector exceeds the bottom surface of the flange of the upper PEC member. Both sides of the web of the upper PEC member and the lower part of the connecting end plate located on the outside of the plywood are cast with precast concrete in the factory. The top surface of the web of the lower PEC member is higher than the top surface of the flange of the lower PEC member. The portion of the web of the lower PEC member that extends beyond the top surface of the flange is a connecting plate with a hole. Longitudinal reinforcement is provided on both sides of the web of the lower PEC member. The top ends of the longitudinal reinforcements of the lower PEC member are fixedly connected to notched clamp-type connectors. The tops of the notched clamp-type connectors are flush with the top surface of the flange of the lower PEC member. Precast concrete is poured in the factory on both sides of the web of the lower PEC member below the connecting plate. The upper PEC component and the lower PEC component are vertically butted together, the flange of the upper PEC component and the flange of the lower PEC component are welded and fixed, the gap between the bottom of the upper PEC component and the top of the lower PEC component is filled with structural adhesive, the connecting plate is inserted between the two clamping plates, the convex clamp connector and the concave clamp connector are plugged and fixed to each other, a torsion shear type high-strength bolt is arranged in the steel sleeve, and the two clamping plates and the connecting plate are fixedly connected by the torsion shear type high-strength bolt.

[0006] Furthermore, the convex clamp type connector includes a connector sleeve and a plug, the bottom end of the longitudinal rib of the upper PEC component is inserted into the connector sleeve and fixed, the upper part of the plug is embedded in the connector sleeve, and the lower part of the plug is exposed outside the connector sleeve; the concave clamp type connector includes a connector sleeve and a spring sheet, the top end of the longitudinal rib of the lower PEC component is inserted into the connector sleeve and fixed, the spring sheet is installed in the connector sleeve, the upper and lower ends of the spring sheet are open, and the plug is embedded in the inner cavity of the spring sheet and extends from the lower open end of the spring sheet.

[0007] Furthermore, the inner wall of the connector sleeve is provided with a thread, and the longitudinal rib is embedded in the outer wall of one end of the connector sleeve and is provided with a thread.

[0008] The present invention also discloses a construction method for the vertical splicing node of the PEC component, which includes the following steps: Step 1): Complete the prefabrication of the upper PEC component and the lower PEC component in the factory; Step 2): First complete the installation of the lower PEC component at the construction site, and then apply structural adhesive on the top surface of the lower PEC component; Step 3): Hoist the upper PEC component above the lower PEC component, insert the connecting plate between the two clamping plates, align the convex clamp connectors on the upper PEC component with the corresponding concave clamp connectors on the lower PEC component, and insert and fix them together; Step 4): Place torsion shear type high-strength bolts in the steel sleeve and use the high-strength bolts to fix the connecting plate to the two side clamps; Step 5): Fix the flange of the upper PEC component and the flange of the lower PEC component by using split full penetration welding.

[0009] In the vertical splicing node of the PEC components designed by the present invention, the upper PEC component and the lower PEC component are both prefabricated with concrete in the factory. In particular, the node area of the upper PEC component divided by the connecting end plate is precast with concrete in the factory, except for the area inside the steel sleeve and between the two plywood. This eliminates the inconvenience of on-site gluing of the node area at the construction site, making the concrete after the upper and lower PEC components are vertically spliced continuous, ensuring the vertical force transmission effect of the concrete; in addition, the longitudinal reinforcement connection ends of the upper and lower PEC components are installed with clamp-type connectors. During on-site construction, it is only necessary to insert and fix the convex clamp-type connector on the longitudinal reinforcement of the upper PEC component with the concave clamp-type connector on the longitudinal reinforcement of the lower PEC component, eliminating the welding operation of the longitudinal reinforcement at the construction site, simplifying the node operation steps as a whole, improving installation efficiency, and reducing safety hazards such as poor steel bar welding quality and loose concrete poured on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Schematic diagram of the structure of the upper PEC column in the embodiment; Figure 2 This is a schematic structural diagram of the lower PEC column in the embodiment; Figure 3 Schematic diagram of the vertical splicing node between the upper PEC column and the lower PEC column; Figure 4 for Figure 3 Cross-sectional view at 1-1; Figure 5 It is a schematic diagram of the connection between the convex clamp type connector and the longitudinal reinforcement; Figure 6 It is a schematic diagram of the connection between the notched clamp type connector and the longitudinal reinforcement; Figure 7 This is a schematic diagram of a male clamp connector and a female clamp connector after being plugged in.

[0011] Reference numerals: 1. Connecting end plate; 2. Clamp; 3. Steel sleeve; 4. Precast concrete; 5. Male clamp connector; 6. Female clamp connector; 7. Longitudinal reinforcement; 8. Structural adhesive; 9. Connecting plate; 10. Torsion shear high-strength bolt; 11. Connector sleeve; 12. Plug; 13. Shrapnel. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0013] This embodiment discloses a vertical splicing node of PEC components. The PEC components can be PEC shear walls or PEC columns. The drawings of this embodiment are shown using the vertical splicing of PEC columns as an example. To facilitate the distinction between the two vertically connected PEC components, the upper one is called the upper PEC component, and the lower one is called the lower PEC component. Both the upper and lower PEC components are prefabricated in the factory.

[0014] Among them, the structure of the upper PEC component is as follows Figure 1 As shown, the internal steel skeleton is an H-shaped steel, and longitudinal bars 7 are provided on both sides of the web of the H-shaped steel. In this embodiment, the web and flange of the H-shaped steel are not of equal length, that is, the bottom of the web is some distance away from the bottom surface of the flange, and this area serves as a node area. A connecting end plate 1 is horizontally arranged at the bottom of the web, and the connecting end plate 1 is welded to the bottom surface of the web. The two sides of the connecting end plate 1 are also welded and fixed to the flange. Longitudinal bar through-holes are required on the connecting end plate 1 corresponding to the arrangement of the longitudinal bars 7, so that the longitudinal bars 7 can pass through the longitudinal bar through-holes and extend to the lower part of the connecting end plate 1. At the bottom of the connecting end plate 1, a plywood 2 is arranged on each side of the web. The two plywoods 2 are parallel and have a gap. The plywood 2 is parallel to the web, and the top of the plywood 2 is welded to the bottom surface of the connecting end plate 1. The bottom end of the plywood 2 is flush with the bottom surface of the flange. Symmetrical holes are opened on the two clamping plates 2. Steel sleeves 3 are welded on the outer walls of the two clamping plates 2 at the corresponding holes. The steel sleeves 3 are perpendicular to the clamping plates 2. The longitudinal reinforcement 7 needs to avoid the location of the steel sleeves 3 when laying. The bottom end of each longitudinal reinforcement 7 of the upper PEC component is fixedly connected to the convex clamp connector 5, such as Figure 5 As shown, the male clamp connector 5 comprises a hollow connector sleeve 11 and a plug 12. The inner wall of the connector sleeve 11 is threaded, and the outer wall of the insertion end of the longitudinal bar 7 is threaded. The longitudinal bar 7 is inserted into the connector sleeve 11 and fixed. The upper half of the plug 12 is embedded in the connector sleeve 11 and fixed, while the lower half of the plug 12 is exposed outside the connector sleeve 11. Both sides of the web and the lower portion of the connecting end plate 1 (except for the interior of the steel sleeve 3 and between the two clamping plates 2) are cast in the factory to form precast concrete 4, which can firmly fix the connector sleeve 11 in the upper PEC member, with only the plug 12 protruding from the bottom surface of the upper PEC member flange.

[0015] The structure of the lower PEC component is as follows Figure 2 As shown, the internal steel frame is H-shaped steel, and longitudinal ribs 7 are provided on both sides of the web of the H-shaped steel. Unlike the upper PEC component, the web of the lower PEC component is longer than the flange. The extended portion serves as a connecting plate 9. The opening position of the connecting plate 9 corresponding to the opening position of the clamping plate 2 is also opened in advance. The top end of each longitudinal rib 7 of the lower PEC component is fixedly connected to the notched clamp type connector 6, as shown in FIG. Figure 6 As shown, the notched clamp connector 6 includes a connector sleeve 11 and a cylindrical spring piece 13. The inner wall of the connector sleeve 11 is threaded, and the outer wall of the connecting end of the longitudinal reinforcement 7 is threaded, so that the longitudinal reinforcement 7 is embedded in the connector sleeve 11 and fixed. The spring piece 13 is hollow and cylindrical, with both upper and lower ends open, and the lower end opening is narrower than the upper end. The spring piece 13 consists of a cylindrical body and an outer flange. The cylindrical body is embedded in the connector sleeve 11 and fixed, and the outer flange is clamped to the top of the connector sleeve 11. After the notched clamp connector 6 is installed on the lower PEC component, the top surface of the notched clamp connector 6 is basically flush with the top surface of the flange. The web is poured in the factory to form precast concrete 4 on both sides, firmly fixing the notched clamp connector 6 inside the lower PEC component.

[0016] The node formed by vertically splicing the upper PEC component and the lower PEC component is as follows: Figure 3 、 Figure 4 、 Figure 7 As shown, the flanges of the upper and lower PEC components are connected, the connecting plate 9 is inserted between the two clamping plates 2, the top surface of the lower PEC component is coated with structural adhesive 8, and each corresponding longitudinal rib 7 on the upper and lower PEC components is plugged and fixed to each other through the male clamp connector 5 and the female clamp connector 6, as shown. Figure 7 As shown, after plugging together, the exposed end of plug 12 is inserted through the upper open end of spring clip 13, penetrates the entire inner cavity of spring clip 13, and then extends out through the lower open end. During the extension of plug 12, spring clip 13 is squeezed outward. After plug 12 is extended, spring clip 12 contracts inward, locking plug 12. High-strength torsional shear bolts 10 are placed inside steel sleeve 3 and secure connecting plate 9 and two clamping plates 2 together. The flanges of the upper and lower PEC members are secured by full-penetration welds.

[0017] In the vertical joint provided by the present invention, space is reserved inside the steel sleeve 3 for the installation of the torsion-shear high-strength bolts 10, which also reinforces the missing and discontinuous concrete inside the steel sleeve 3. The longitudinal reinforcement 7 of the upper and lower PEC components is connected using mutually interlocking clamp-type connectors, eliminating on-site welding operations and making it more convenient and quick. By matching the thickness of the spring piece 13, the thickness of the connector sleeve 11, and the cross-section of the longitudinal reinforcement 7, the strength requirements of steel bar welding can be achieved. Although the web of the upper PEC component does not penetrate to the lower portion of the connecting end plate 1, the present invention can achieve the same strength effect as the web connection of the steel PEC component by connecting the connecting plate 9 and the clamping plate 2 with the torsion-shear high-strength bolts 10. The present invention also uses structural adhesive 8 to fill the gap between the butt joints of the precast concrete 4 of the upper and lower PEC components, ensuring the transmission of force between the four surfaces of the precast concrete.

[0018] The vertical splicing node provided by the present invention can be constructed in the following order: Step 1): Complete the prefabrication of the upper PEC component and the lower PEC component in the factory; Step 2): First complete the installation of the lower PEC component at the construction site, and then apply structural adhesive 8 on the top surface of the lower PEC component; Step 3): Hoist the upper PEC component above the lower PEC component, insert the connecting plate 9 between the two clamping plates 2, align the convex clamp connectors 5 on the upper PEC component with the corresponding concave clamp connectors 6 on the lower PEC component, and insert and fix them together; Step 4): Place the torsion shear type high-strength bolt 10 into the steel sleeve 3, and use the torsion shear type high-strength bolt 10 to fix the connecting plate 9 to the two side clamping plates 2; Step 5): Fix the flange of the upper PEC component and the flange of the lower PEC component by using split full penetration welding.

[0019] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A vertical joint of PEC components, comprising an upper PEC component and a lower PEC component, characterized in that: The bottom surface of the web of the upper PEC member is higher than the bottom surface of the flange of the upper PEC member. The bottom surface of the web of the upper PEC member is welded with a connecting end plate, which is perpendicular to the web and connected to the flange. A longitudinal reinforcement through-hole is provided on the connecting end plate. Two plywoods are welded on the bottom surface of the connecting end plate perpendicular to the connecting end plate. The bottom surface of the plywood is flush with the bottom surface of the flange of the upper PEC member. The two plywoods are parallel to the web and spaced apart. Holes are symmetrically opened on the two plywoods. Steel sleeves are welded on the outer walls of the two plywoods corresponding to the holes. The steel sleeves are perpendicular to the plywoods. Longitudinal reinforcements are provided on both sides of the web of the upper PEC member. The longitudinal reinforcements of the upper PEC member pass through the longitudinal reinforcement through-holes. The bottom end of the longitudinal reinforcement of the upper PEC member is fixedly connected to a male clamp-type connector. The bottom of the male clamp-type connector exceeds the bottom surface of the flange of the upper PEC member. Both sides of the web of the upper PEC member and the lower part of the connecting end plate located on the outside of the plywood are cast with precast concrete in the factory. The top surface of the web of the lower PEC member is higher than the top surface of the flange of the lower PEC member. The portion of the web of the lower PEC member that extends beyond the top surface of the flange is a connecting plate with a hole. Longitudinal reinforcement is provided on both sides of the web of the lower PEC member. The top ends of the longitudinal reinforcements of the lower PEC member are fixedly connected to notched clamp-type connectors. The tops of the notched clamp-type connectors are flush with the top surface of the flange of the lower PEC member. Precast concrete is poured in the factory on both sides of the web of the lower PEC member below the connecting plate. The upper PEC component and the lower PEC component are vertically butted together, the flange of the upper PEC component and the flange of the lower PEC component are welded and fixed, the gap between the bottom of the upper PEC component and the top of the lower PEC component is filled with structural adhesive, the connecting plate is inserted between the two clamping plates, the convex clamp connector and the concave clamp connector are plugged and fixed to each other, a torsion shear type high-strength bolt is arranged in the steel sleeve, and the two clamping plates and the connecting plate are fixedly connected by the torsion shear type high-strength bolt.

2. A PEC component vertical splicing node according to claim 1, characterized in that: The convex clamp type connector includes a connector sleeve and a plug, the bottom end of the longitudinal rib of the upper PEC component is inserted into the connector sleeve for fixation, the upper part of the plug is embedded in the connector sleeve, and the lower part of the plug is exposed outside the connector sleeve; the concave clamp type connector includes a connector sleeve and a spring piece, the top end of the longitudinal rib of the lower PEC component is inserted into the connector sleeve for fixation, the spring piece is installed in the connector sleeve, the upper and lower ends of the spring piece are open, the plug is embedded in the inner cavity of the spring piece and extends from the lower open end of the spring piece.

3. A PEC component vertical splicing node according to claim 2, characterized in that: The inner wall of the connector sleeve is provided with a thread, and the outer wall of one end of the longitudinal rib embedded in the connector sleeve is provided with a thread.

4. The construction method of the vertical splicing node of the PEC member according to any one of claims 1 to 3, characterized in that: The steps include: Step 1): Complete the prefabrication of the upper PEC component and the lower PEC component in the factory; Step 2): First complete the installation of the lower PEC component at the construction site, and then apply structural adhesive on the top surface of the lower PEC component; Step 3): Hoist the upper PEC component above the lower PEC component, insert the connecting plate between the two clamping plates, align the convex clamp connectors on the upper PEC component with the corresponding concave clamp connectors on the lower PEC component, and insert and fix them together; Step 4): Place torsion shear type high-strength bolts in the steel sleeve and use the high-strength bolts to fix the connecting plate to the two side clamps; Step 5): Fix the flange of the upper PEC component and the flange of the lower PEC component by using split full penetration welding.

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