A PEC shear wall and its construction method

Abstract

The present application relates to a kind of PEC shear wall and construction method, including the web of punch, the steel mesh located in the web both sides, the tension shear reinforcement that is inserted into the web punch, web both ends are also provided with end reinforcing member, tension shear reinforcement includes connecting tendon and the bending part located in the both ends of connecting tendon and perpendicular to connecting tendon, the connecting tendon of tension shear reinforcement is inserted into the punch of web, the bending part of the both ends of tension shear reinforcement is respectively connected with the steel mesh of same side, and the concrete is poured in the web both sides.The PEC shear wall of the present application, compared with the structure in the prior art, eliminates the welding of rib plate and flange tie rod, greatly reduces the welding amount of factory, and the steel mesh can be produced in standardized batch, which is more conducive to the standardized production of PEC shear wall.Tension shear reinforcement is connected with the steel mesh, which is more easily bonded with the poured concrete, which helps to improve the bearing capacity and overall stability of PEC shear wall.

Description

Technical Field

[0001] This invention relates to the field of prefabricated buildings, specifically to a PEC shear wall and its construction method. Background Technology

[0002] Partially Encased Composite Shear Wall (PEC shear wall) is a composite section made of I-beams or hot-rolled thin steel plates. It consists of 2-3 H-beams or I-beams (rolled or welded) spliced ​​with steel plates, and concrete is poured between the flanges. PEC shear walls take into account the distribution of internal forces within the components under actual stress, and achieve better economic results by adjusting the steel plate thickness and grid arrangement.

[0003] Currently, PEC shear wall components generally use thick steel sections, such as... Figure 1 The image shows a common PEC shear wall construction style. Its confinement structure mainly consists of flange tie rods 1 and longitudinal reinforcement 3. The components can be prefabricated in the factory, and only splicing and installation are required on-site. This effectively reduces the construction period while ensuring component construction quality, resulting in good economic benefits. However, for PEC shear walls with a large width and thickness, they generally need to be composed of multiple sections 4. Figure 1 The diagram shows four sections. Ribs 2 need to be welded between adjacent sections, and flange tie rods 1 between adjacent sections need to be welded to ribs 2. This type of PEC shear wall has the disadvantages of large welding workload, high factory prefabrication cost, and low degree of standardized processing. Summary of the Invention

[0004] This invention discloses two novel PEC shear wall structures and their construction methods. Compared with existing shear wall structures, both can significantly reduce the amount of welding in the factory, achieve the processing of standardized components, reduce manufacturing costs, and enhance the load-bearing capacity and overall stability of the PEC shear wall.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A PEC shear wall includes a web, end columns at both ends of the web, steel mesh on both sides of the web, and multiple tension shear bars penetrating the web. Multiple perforations are formed in the web. The tension shear bars include connecting bars and bent portions at both ends of the connecting bars, perpendicular to the connecting bars. The connecting bars of the tension shear bars penetrate the perforations in the web. The bent portions at both ends of the tension shear bars are interlocked with the steel mesh on the same side. The ends of the steel mesh are fixedly connected to the flanges of the adjacent end columns. Concrete is poured into both sides of the web and the cavity of the end columns.

[0007] Furthermore, the end column includes an H-beam and an end steel mesh. The H-beam includes a first flange, a second flange, and an end web. The end web is coplanar with the end web. An end steel mesh is provided on each side of the end web. The end of the steel mesh is welded to the second flange. The end steel mesh includes longitudinal steel bars arranged parallel to each other at both ends and multiple transverse steel bars connected to the longitudinal steel bars at both ends. The longitudinal steel bars at both ends are threaded steel bars and the diameter of the longitudinal steel bars is larger than the diameter of the transverse steel bars. One end of the longitudinal steel bar in the end steel mesh on the same side is fixed to the first flange, and the other end of the longitudinal steel bar is fixed to the second flange. Concrete is poured on both sides of the end web.

[0008] Furthermore, the diameter of the longitudinal reinforcement is 25mm, the diameter of the tension shear reinforcement is 8mm, and the diameter of the hole punched in the web is 11mm.

[0009] The construction method for the above-mentioned PEC shear wall includes the following steps:

[0010] Step 1: Prefabricate the H-beams in the end columns in the factory, and prefabricate the end steel mesh and steel mesh in the factory;

[0011] Step 2: Place the two end steel meshes on both sides of the end web of the H-beam, and fix the longitudinal steel bars in the end steel meshes on each side to the flange of the H-beam by intermittent welding.

[0012] Step 3: Weld the two ends of the punched web plate to the flanges of the two end posts respectively;

[0013] Step 4: Insert multiple tension shear bars into the punched holes in the web;

[0014] Step 5: Place a steel mesh on each side of the web, and connect the bent part of the tension shear bar with the steel mesh on the same side. Weld the two ends of the steel mesh to the flange of the end column.

[0015] Step 6: After completing step 5, pour concrete on both sides of the web and both sides of the end web, and vibrate it thoroughly to form the desired shape.

[0016] A PEC shear wall includes an I-beam composed of a first flange, a second flange, and a web. Reinforcing mesh is provided on both sides of the web. Multiple perforations are made in the web, through which tie shear bars are inserted. Each tie shear bar includes connecting bars and bent portions located at both ends of the connecting bars and perpendicular to them. The connecting bars pass through the perforations in the web. The bent portions at both ends of the tie shear bars are interlocked with the reinforcing mesh on the same side. The ends of the reinforcing mesh are fixedly connected to the flanges on adjacent sides. Multiple reinforcing triangular bars are longitudinally spaced at both ends of the web near the flanges. Each reinforcing triangular bar passes through a perforation in the web and is bent to form two sides of a triangle. The free end of each bent reinforcing triangular bar is fixed to the flange on the same side. The reinforcing triangular bars and the flange surface form a triangular cross-section. Concrete is poured on both sides of the web.

[0017] Furthermore, the diameter of the reinforcing triangular rib is 10mm.

[0018] Furthermore, the spacing between adjacent upper and lower reinforcing triangular ribs is 100mm to 200mm.

[0019] The construction method for the above-mentioned PEC shear wall includes the following steps:

[0020] Step 1: Punch holes in the web plate in the factory, and then weld it to the flange to form an I-beam. Prefabricate the steel mesh in the factory.

[0021] Step 2: Insert the bent reinforcing triangular ribs longitudinally into the punch holes at both ends of the web near the flange, and weld the free ends of the reinforcing triangular ribs to the flanges;

[0022] Step 3: Insert multiple tension shear bars into the punched holes in the web;

[0023] Step 4: Place a steel mesh on each side of the web, and connect the bent part of the tension shear bar with the steel mesh on the same side. Weld the two ends of the steel mesh to the flange.

[0024] Step 5: After completing step 4, pour concrete on both sides of the web and vibrate it thoroughly to form the desired shape.

[0025] The PEC shear wall designed in this invention replaces the ribs in the prior art by punching holes in the web and installing tie rods, and uses pre-welded steel mesh instead of flange tie rods. The tie rods and steel mesh are interlocked, requiring only the two ends of the steel mesh to be welded to the flanges. Compared to the existing structure, this eliminates the welding of ribs and flange tie rods, significantly reducing the amount of welding required in the factory. Furthermore, the steel mesh can be mass-produced in a standardized manner, which is more conducive to the standardized production of PEC shear walls. The interlocking connection between the tie rods and the steel mesh makes it easier to bond with the poured concrete. This invention also strengthens the ends, resulting in higher load-bearing capacity and stronger overall stability compared to existing PEC shear walls. Attached Figure Description

[0026] Figure 1 This is a structural diagram of a PEC shear wall in the prior art;

[0027] Figure 2 This is a top view of the PEC shear wall structure corresponding to Example 1;

[0028] Figure 3 This is a three-dimensional structural diagram of the PEC shear wall before the concrete is poured, corresponding to Example 1.

[0029] Figure 4 This is a top view of the PEC shear wall structure corresponding to Example 2;

[0030] Figure 5 This is a three-dimensional structural diagram of the PEC shear wall before the concrete is poured, corresponding to Example 2;

[0031] Figure 6 This is a schematic diagram of the PEC shear wall after the tension shear bars have been assembled, corresponding to Example 2.

[0032] Figure 7 This is a schematic diagram of the steel mesh structure used in Embodiment 1 and Embodiment 2;

[0033] Figure 8 This is a partial enlarged view of the end reinforcing triangular ribs of the PEC shear wall corresponding to Example 2.

[0034] Explanation of icon numbers:

[0035] 1. Flange tie rod; 2. Rib plate; 3. Longitudinal reinforcement; 4. Grid; 5. End column; 51. H-beam; 511. First flange; 512. Second flange; 513. End web; 52. End steel mesh; 521. Longitudinal reinforcement; 522. Transverse reinforcement; 6. Steel mesh; 7. Web; 8. Tie shear reinforcement; 9. Perforation; 10. Concrete; 11. I-beam; 111. First flange; 112. Second flange; 113. Web; 12. Reinforcing triangular reinforcement. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0037] This invention discloses a steel-concrete composite shear wall structure with internal concrete filling, abbreviated as PEC shear wall, aiming to improve upon existing technologies such as... Figure 1 The structure shown, which uses flange tie rod 1 and rib plate 2, has shortcomings such as weak end construction nodes, large welding workload, and low degree of standardization. The structure given in this embodiment is particularly suitable for PEC shear walls with large width and thickness. The following two specific embodiments are given to illustrate the improved PEC shear wall structure of the present invention.

[0038] Example 1: As Figure 2 and Figure 3 As shown, the PEC shear wall in this embodiment includes a web 7, end columns 5 located at both ends of the web 7, steel mesh 6 located on both sides of the web 7, tension shear bars 8 located on the web 7, and poured concrete 10. The end columns 5 serve to strengthen the end structure. The end columns 5 include H-beams 51 and end steel mesh 52. The H-beams 51 consist of a first flange 511, a second flange 512, and an end web 513. The two ends of the web 7 are welded to the second flanges 512 of the end columns 5, so that the end web 513 and the web 7 are in the same plane. Multiple perforations 9 with a diameter of 11mm are provided on the web 7. The tension shear bars 8 are made of 8mm diameter steel bars bent into a U-shape, including a central connecting bar and bent portions at both ends of the connecting bar, with the bent portions perpendicular to the connecting bar. The steel mesh 6 is as follows... Figure 7 As shown, it is prefabricated in the factory using crisscrossing steel bars. A steel mesh 6 is installed on each side of the web 7, with both ends of each mesh 6 welded to the second flange 512 of the end column 5 on the same side. Tie shear bars 8 are inserted into the punched holes 9 of the web 7, with the connecting bars of the tie shear bars 8 passing through the punched holes 9 of the web 7, and the bent portions at both ends of the tie shear bars 8 being interlocked with the steel mesh 6 on the same side.

[0039] To strengthen the ends of the PEC shear wall, an end steel reinforcement mesh 52 is provided on both sides of the web 513 at the end of each end column 5. This end steel reinforcement mesh 52 includes longitudinal steel bars 521 arranged parallel to each other at both ends, and multiple transverse steel bars 522 connected to the longitudinal steel bars 521 at both ends. The longitudinal steel bars 521 at both ends are threaded steel bars, and their diameter is much larger than that of the transverse steel bars 522. In this embodiment, the diameter of the longitudinal steel bars 521 is 25mm. One end of the longitudinal steel bar 521 in the end steel reinforcement mesh 52 on the same side is welded and fixed to the first flange 511, and the other end of the longitudinal steel bar 521 is welded and fixed to the second flange 512. In this embodiment, the end column 5, through the coarse threaded steel bars and the end flange forming a combined section, combined with the concrete, can prevent premature buckling of the PEC shear wall flange. Since the longitudinal reinforcement 521 is a relatively thick threaded steel bar, it forms a lattice relationship with the ends of the web 7. Therefore, the longitudinal reinforcement 521 and the flange of the H-beam 51 can be welded intermittently. The weld spacing can be selected as 4xD25=100, and the weld is marked as 30 / 100 on one side. Thus, the flange width-to-thickness ratio can be appropriately relaxed (with reinforcement compensation). After completing the connection of the components according to the above structure, concrete 10 is poured on both sides of the web 7 and on both sides of the end of the web 513 of each end column 5 to form the PEC shear wall structure of this embodiment.

[0040] The specific construction method for the PEC shear wall described in this embodiment is as follows:

[0041] Step 1: Prefabricate the H-beams 51 for the end columns 5 in the factory. The H-beams 51 can be prefabricated from finished I-beams or formed by welding the side flanges and web according to the design drawings. Simultaneously, prefabricate the reinforcing mesh 6 and the thickened threaded end reinforcing mesh 52 in the factory. The end reinforcing mesh 52 can be processed using high-frequency welding technology, enabling highly efficient and standardized operations.

[0042] Step 2: Place the two end steel meshes 52 on both sides of the end web 513 of the H-beam 51. Fix the longitudinal steel bars 521 in the end steel meshes 52 on each side to the flange of the H-beam 51 by intermittent welding. The spacing between the weld points can be selected as 4xD25=100, and the weld seam is marked as 30 / 100 on one side.

[0043] Step 3: Weld the two ends of the web plate 7 with the punched holes 9 to the inner flanges of the two end columns 5 respectively to form the steel frame of the PEC shear wall.

[0044] Step 4: After completing step 3, insert multiple shear bars 8 into the punch holes 9 on the web plate 7.

[0045] Step 5: After completing Step 4, place a steel mesh 6 on each side of the web 7, and connect the bent portion of the tie shear reinforcement 8 with the steel mesh 6 on the same side. Weld both ends of the steel mesh 6 to the inner flange of the end column 5. The specific location of the perforations of the tie shear reinforcement 8 and the arrangement of the steel mesh 6 are determined according to the project design requirements.

[0046] Step 6: After completing step 5, lay the component flat on the mold or other demolding material, pour concrete on both sides of the web 7 and both sides of the end web 513, and fully vibrate and shape it to prevent air bubbles from accumulating and forming cavities. After curing, demold and stack it. After acceptance, it can be shipped out of the factory.

[0047] Example 2: Figures 4 to 8 As shown, the PEC shear wall in this embodiment includes an I-beam 11 (the I-beam 11 is formed by connecting a web 113, a first flange 111, and a second flange 112), steel mesh 6 on both sides of the web 113, tie shear bars 8 on the web 113, multiple reinforcing triangular bars 12 near the flanges at both ends of the web 113, and poured concrete 10. Multiple perforations 9 with a diameter of 11mm are provided on the web 113. The tie shear bars 8 are made of 8mm diameter steel bars bent into a U-shape, including a central connecting bar and bent portions at both ends of the connecting bar, the bent portions being perpendicular to the connecting bar. The steel mesh 6 is as follows... Figure 7 As shown, it is prefabricated in the factory using crisscrossing steel bars. A steel mesh 6 is installed on each side of the web 113, with one end of the mesh 6 welded to the first flange 111 and the other end welded to the second flange 112. Tie shear bars 8 are inserted into the punched holes 9 of the web 113, with the connecting bars of the tie shear bars 8 passing through the punched holes 9 of the web 113, and the bent portions at both ends of the tie shear bars 8 being interlocked with the steel mesh 6 on the same side.

[0048] The main difference between the PEC shear wall in this embodiment and that in Embodiment 1 lies in the arrangement of the end reinforcement structure. Specifically, in this embodiment, multiple reinforcing triangular ribs 12 are longitudinally spaced at both ends of the web 113 near the flanges. These reinforcing triangular ribs 12 are formed by bending 10mm diameter steel bars. The distance between adjacent reinforcing triangular ribs 12 on the same side is 100mm to 200mm. The bend of each reinforcing triangular rib 12 passes through a punch 9 on the web 113, and the free end of each bent reinforcing triangular rib 12 is welded to the adjacent flange on the same side. This arrangement allows the bent reinforcing triangular ribs 12 and the flange surface to form a triangular cross-section, effectively preventing premature flange buckling and creating a reinforced end structure that improves the load-bearing capacity and overall stability of the PEC shear wall. After connecting the components according to the above structure, concrete 10 is poured on both sides of the web 113 to form the PEC shear wall structure of this embodiment.

[0049] The specific construction method for the PEC shear wall described in this embodiment is as follows:

[0050] Step 1: Punch holes in the web 113 in the factory, and then weld the punched web 113 to the flange plate according to the design and construction drawings to form an I-beam 11, and prefabricate the steel mesh 6 in the factory.

[0051] Step 2: Insert the bent reinforcing triangular ribs 12 longitudinally at intervals into the punch holes 9 at both ends of the web plate 113 near the flange, and weld the free ends of the reinforcing triangular ribs 12 to the flange of the I-beam 11.

[0052] Step 3: Insert multiple shear bars 8 into the punch holes 9 on the web plate 113.

[0053] Step 4: Place a steel mesh 6 on each side of the web 113, and connect the bent portion of the tie shear reinforcement 8 with the steel mesh 6 on the same side. Weld both ends of the steel mesh 6 to the flanges of the I-beam 11. The specific location of the perforations in the tie shear reinforcement 8 and the arrangement of the steel mesh 6 are determined according to the project design requirements.

[0054] Step 5: After completing step 4, lay the component flat on the mold or other demolding material, pour concrete 10 on both sides of the web 113 and vibrate it fully to prevent air bubbles from accumulating and forming cavities. After curing, demold and stack the components. After acceptance, the components can be shipped out of the factory.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A PEC shear wall characterized by: The I-shaped steel is composed of a first flange, a second flange and a web, the web is provided with a steel mesh on each side, a plurality of punching holes are formed on the web, and a pair of tension shear bars are inserted through the punching holes; the tension shear bar comprises a connecting bar and a bent part at each end of the connecting bar and perpendicular to the connecting bar, the connecting bar of the tension shear bar penetrates the punching hole of the web, the bent parts at the two ends of the tension shear bar are respectively connected to the steel mesh on the same side by buckling, the end of the steel mesh is fixedly connected to the flange on the adjacent side, a plurality of reinforcing triangular bars are respectively arranged on the web at the two ends near the flanges along the longitudinal direction, each reinforcing triangular bar passes through the punching hole on the web and is bent to form two sides of a triangle, the free end of each reinforcing triangular bar after being bent is fixed to the flange on the same side, the reinforcing triangular bar and the flange surface form a triangular cross section, and the web is poured with concrete on the two sides.

2. The PEC shear wall of claim 1, wherein: The diameter of the reinforcing triangular bar is 10 mm.

3. The PEC shear wall of claim 1, wherein: The distance between the reinforcing triangular bars above and below is 100-200 mm.

4. The construction method of the PEC shear wall according to any one of claims 1-3, characterized in that: Step 1: punching holes in the web in the factory, then welding the web with the flanges to form an I-shaped steel, and precasting the steel mesh in the factory; Step 2: inserting the reinforcing triangular bars after being bent into the punching holes at the two ends of the web near the flanges along the longitudinal direction, and welding the free ends of the reinforcing triangular bars to the flanges; Step 3: inserting a plurality of tension shear bars into the punching holes on the web; Step 4: placing a steel mesh on each side of the web, allowing the bent parts of the tension shear bars to be connected to the steel mesh on the same side by buckling, and welding the two ends of the steel mesh to the flanges; Step 5: after completing Step 4, pouring concrete on both sides of the web and fully vibrating and molding.

Images