A local prestressed connection structure of assembled concrete shear wall

Abstract

The present invention discloses a prefabricated concrete shear wall local prestressed connection structure, including a prefabricated concrete shear wall, wherein the prefabricated concrete shear wall is provided with tie bars, and a lower end member is provided at the bottom of the prefabricated concrete shear wall. The device abandons the traditional steel sleeve grouting method and adopts the prestressed steel bar tensioning method. When the material consumption is far less than that of the steel sleeve grouting method, the joint bearing capacity is close to or even greater than the bearing capacity increased by the steel sleeve grouting method, which is economical and safe. Since the middle part of the prefabricated concrete shear wall and the foundation connection part of the prefabricated concrete shear wall local prestressed connection structure is less stressed than the outer side, it is unnecessary to adopt the prestressed tensioning method. Instead, a steel fiber concrete shear key block is adopted, and prestressed high-strength steel bars and epoxy resin are inserted as grouting materials. The connection method is selected in full combination with the structural stress mode, which reduces the cost and is easy to construct.

Description

Technical Field

[0001] The invention relates to the technical field of assembled concrete structures, in particular to an assembled concrete shear wall local prestressed connection structure. Background Art

[0002] Prefabricated structure is the abbreviation of prefabricated concrete structure, which is a concrete structure formed by assembling and connecting prefabricated components as the main load-bearing components.

[0003] In high-rise and super-high-rise structural systems, shear wall structures and frame-shear wall structures are mainly used, and shear wall components are their main load-bearing components. In prefabricated shear wall structures, the connection method between shear wall components and other components directly determines the structural strength, stiffness and stability. At present, prefabricated concrete shear walls are generally connected at the joints through a mortar layer. Although the use of a mortar layer does not require high technology and has certain economy, the joints are easily damaged, which is not conducive to structural bearing. In addition, the currently known steel bar connections between the upper and lower layers include metal corrugated pipe grout anchor lap connection, constrained grout anchor lap connection and grouting sleeve connection. Due to the existence of natural joints in prefabricated concrete structures, their cracking load, initial stiffness and ductility are relatively weak compared to cast-in-place structures. Due to the above problems, the treatment method of the shear wall component connection of the prefabricated structure is difficult to achieve both safe and economic conditions, which limits the promotion and use of prefabricated structures, and makes construction companies with weak technology tend to choose cast-in-place structures, which is not conducive to the overall technological progress and industrial optimization of the construction industry. Summary of the invention

[0004] The object of the present invention is to provide a prefabricated concrete shear wall local prestressed connection structure to solve the problems of easy cracking, insufficient rigidity and high energy consumption of the shear wall mentioned in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a prefabricated concrete shear wall local prestressed connection structure, comprising a precast concrete shear wall, wherein the precast concrete shear wall is provided with tie bars, and a lower end member is provided at the bottom of the precast concrete shear wall, a steel box is provided at the lower end member and the precast concrete shear wall, and an extended high-strength steel bar is provided on the lower end member, epoxy resin is provided between the precast concrete shear wall and the lower end member, and a groove is provided at the bottom of the precast concrete shear wall, a steel fiber concrete shear key block is provided in the groove, a grouting port is provided on the precast concrete shear wall, and grouting material is provided inside the grouting port, the upper end of the extended high-strength steel bar passes through the steel fiber concrete shear key block and is connected to the precast concrete shear wall, a channel is provided on the steel box, and a closed stirrup is provided on the outer wall of the channel, a prestressed high-strength steel bar is inserted inside the channel, and bolts are provided at the upper and lower ends of the prestressed high-strength steel bar, and a threaded anchoring end is provided on the prestressed high-strength steel bar.

[0006] Preferably, the precast concrete shear wall is fixed by tying together transverse and longitudinal steel bars.

[0007] Preferably, a plurality of steel boxes are provided, and a circular hole is opened on the steel box.

[0008] Preferably, the holes are arranged to intersect with the longitudinal bisector of the precast concrete shear wall, and the holes are fixedly connected to the prestressed high-strength steel bars.

[0009] Preferably, a reserved bolt hole is opened on the hole, and the hole is a curved structure.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention abandons the traditional steel sleeve grouting method and adopts the prestressed steel bar tensioning method. When the material consumption is far less than that of the steel sleeve grouting method, the joint bearing capacity is close to or even greater than the bearing capacity increased by the steel sleeve grouting method, which is economical and safe. Since the stress on the middle part of the precast concrete shear wall and the foundation connection part of the prefabricated concrete shear wall local prestressed connection structure is less than that on the outside, it is unnecessary to adopt the prestressed tensioning method. Instead, steel fiber concrete shear key blocks are adopted, and prestressed high-strength steel bars and epoxy resin are inserted as grouting materials. The connection method is selected in full combination with the structural stress mode, which reduces the cost and facilitates construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a front view of a local prestressed connection structure of an assembled concrete shear wall according to the present invention;

[0012] Figure 2 A precast concrete shear wall diagram of a prefabricated concrete shear wall local prestressed connection structure of the present invention;

[0013] Figure 3 This is a schematic diagram of a steel box and a duct connection structure of a prefabricated concrete shear wall local prestressed connection structure of the present invention;

[0014] Figure 4 This is a cross-sectional view of a local prestressed connection structure of an assembled concrete shear wall of the present invention;

[0015] Figure 5 It is a front view of a steel fiber concrete shear key block of a local prestressed connection structure of an assembled concrete shear wall of the present invention;

[0016] Figure 6 A top view of a steel box of a prefabricated concrete shear wall local prestressed connection structure according to the present invention.

[0017] In the figure: 1. precast concrete shear wall, 2. tie bars, 3. steel box, 4. reserved bolt holes, 5. closed stirrups, 6. prestressed high-strength steel bars, 7. extended high-strength steel bars, 8. lower end member, 9. epoxy resin, 10. steel fiber concrete shear key block, 11. threaded anchor end, 12. bolts, 13. grouting material, 14. grouting port, 15. channel. DETAILED DESCRIPTION

[0018] 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.

[0019] See also Figure 1-6The present invention provides a technical solution: a prefabricated concrete shear wall local prestressed connection structure, comprising a prefabricated concrete shear wall 1, on which a tie bar 2 is arranged, the prefabricated concrete shear wall 1 is a factory prefabricated component, a steel skeleton is first made, wherein the transverse steel bars and the longitudinal steel bars are bundled and connected with the tie bar 2 by a diameter of 8 mm, and a lower end member 8 is arranged at the bottom of the prefabricated concrete shear wall 1, the prefabricated concrete shear wall 1 and the lower end member 8 are upper and lower parts, which need to be connected on site, the prefabricated concrete shear wall 1 is connected by the transverse steel bars and the longitudinal steel bars The structure is tied and fixed with the tie bars 2; a steel box 3 is provided on the lower end member 8 and the precast concrete shear wall 1, and the steel box 3 is welded and fixed to the steel bars on the precast concrete shear wall 1, and an extended high-strength steel bar 7 is provided on the lower end member 8, and the lower end member 8 is cast and fixed to the extended high-strength steel bar 7, and the extended high-strength steel bar 7 extends out of the upper end of the lower end member 8 for connecting the precast concrete shear wall 1, and a plurality of steel boxes 3 are provided, and a total of eight steel boxes 3 are provided, and a circular hole is opened on the steel box 3 for convenient insertion of the prestressed high-strength steel bar 6; a precast concrete shear wall 1 and the lower end member 8 are provided with a steel box 3. Epoxy resin 9, and a groove is provided at the bottom of the precast concrete shear wall 1, a steel fiber concrete shear key block 10 is arranged in the groove, a grouting port 14 is provided on the precast concrete shear wall 1, and a grouting material 13 is arranged inside the grouting port 14, which is used to fix the prestressed high-strength steel bar 6 and the extended high-strength steel bar 7, and the upper end of the extended high-strength steel bar 7 passes through the steel fiber concrete shear key block 10 and is connected to the precast concrete shear wall 1, a hole 15 is provided on the steel box 3, and the outer wall of the hole 15 is provided with a closed stirrup 5, and a prestressed high-strength steel bar 6 is inserted inside the hole 15, and the prestressed high-strength steel bar 6 is inserted in the upper and lower Bolts 12 are provided at both ends, and a threaded anchor end 11 is provided on the prestressed high-strength steel bar 6; the hole 15 is arranged crosswise with respect to the longitudinal bisector of the precast concrete shear wall 1, and the hole 15 is fixedly connected to the prestressed high-strength steel bar 6; a reserved bolt hole 4 is provided on the hole 15, and the hole 15 is a curved structure; the transverse steel bars and the longitudinal steel bars of the precast concrete shear wall 1 are connected by a tie bar 2 with a diameter of 8 mm, and then the steel box 3 is welded to the steel bars about 400m away from the bottom end of the precast concrete shear wall, wherein 8 steel bars per section are welded to the sides of 4 steel boxes 3;The precast concrete shear wall 1 has a total of 4 pairs of steel boxes 3, and a channel 15 is set between each pair of steel boxes 3. A bolt hole 4 is reserved at the end of the channel 15. The channel 15 has a certain curvature to facilitate the insertion of prestressed high-strength steel bars 6. The edge constraint member uses a dense closed stirrup 5 with a diameter of 14mm to constrain the edge member to prevent dislocation during tensioning, and the closed stirrup 5 is to the threaded anchor end 11. The prestressed high-strength steel bar 6 has a diameter of 22mm and a yield strength of 600MPa. The prestressed high-strength steel bar 6 is inserted into the channel 15. At the same time, 3 grooves are left in the middle of the lower end of the precast concrete shear wall 1 and the extended high-strength steel bar 7 is inserted. The lower end member 8 is also welded with a steel box 3, a total of 8, and a groove is left. 1.0mm to 2mm epoxy is applied to the bottom of the precast concrete shear wall 1 Resin 9, then put three steel fiber concrete shear key blocks 10 into the groove, and apply the same thickness of epoxy resin 9 around the steel fiber concrete shear key blocks 10, align the positions, insert the steel fiber concrete shear key 10 and the prestressed high-strength steel bar 6 into the lower end member 8; insert the prestressed high-strength steel bar 6 into the channel 15 of the precast concrete shear wall 1, and perform tensioning at the steel box 3 of the precast concrete shear wall 1. The tensioning value is 200-300MPa. After reaching the strength, the prestressed high-strength steel bar 6 is anchored and grouting is performed through the steel box 3. The extended distributed high-strength steel bar 7 of the lower end member 8 is inserted into the metal corrugated pipe of the precast concrete shear wall 1, and the grouting material 13 is poured into the grouting port 14 of the metal corrugated pipe connected to the distributed steel bar slurry anchor, such as; Figure 3 and Figure 4 As shown, a bolt hole 4 with a diameter of 43mm is reserved inside each steel box 3, and a channel 15 is formed by pre-buried metal corrugated pipe. The bending radius of the channel 15 is 830, which creates conditions for tensioning the prestressed high-strength steel bar 6. After the prestressed high-strength steel bar 6 is tensioned, 4.6-grade M22 bolts 12 are used as anchors. The thickness of the steel box 3 is 8mm, and the welding length is 100mm. The grouting operation inside the steel box 3 is simple, the finished product quality is good, and the workers do not need to have high technical content; The grouting operation inside the steel box 3 is simple, the finished product quality is good, and the workers do not need to have high technical content, which improves the applicability of prefabricated components, reduces the technical threshold of construction companies, and is beneficial The invention is conducive to the technological progress of the whole industry; the invention abandons the traditional steel sleeve grouting method and adopts the prestressed steel bar tensioning method. When the material consumption is far less than that of the steel sleeve grouting method, the joint bearing capacity is close to or even greater than that of the steel sleeve grouting method, which is economical and safe; the middle part of the precast concrete shear wall 1 and the foundation connection part of the assembled concrete shear wall local prestressed connection structure is less stressed than the outer side, so it is unnecessary to adopt the prestressed tensioning method. Instead, a steel fiber concrete shear key block 10 is adopted, and prestressed high-strength steel bars 6 and epoxy resin 9 are inserted as grouting materials 13. The connection method is selected in full combination with the structural stress mode, which reduces the cost and is easy to construct.

[0020] Working principle: When using the prefabricated concrete shear wall local prestressed connection structure, first fix the tie bar 2 to the precast concrete shear wall 1, then weld the steel box 3 on the precast concrete shear wall 1, and then set the steel box 3 on the lower end member 8, then insert the prestressed high-strength steel bar 6 into the channel 15 between the steel boxes 3, and then insert the extended high-strength steel bar 7 at the top of the lower end member 8 from the bottom of the precast concrete shear wall 1 into the precast concrete shear wall 1, connect the precast concrete shear wall 1 to the lower end member 8, and apply epoxy resin 9 between the precast concrete shear wall 1 and the lower end member 8, and at the same time apply epoxy resin 9 to the extended high-strength steel bar 7. After insertion and fixing, adjust the tension of the prestressed high-strength steel bar 6, and fix it with bolts 12 after adjustment. After fixing, finally pour grouting material 13 at the grouting port 14 to complete all the work. This is the working principle of the prefabricated concrete shear wall local prestressed connection structure.

[0021] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A prefabricated concrete shear wall local prestressed connection structure, comprising a prefabricated concrete shear wall (1), characterized in that: The precast concrete shear wall (1) is provided with tie bars (2), and a lower end member (8) is provided at the bottom of the precast concrete shear wall (1), a steel box (3) is provided on the lower end member (8) and the precast concrete shear wall (1), and an extended high-strength steel bar (7) is provided on the lower end member (8), an epoxy resin (9) is provided between the precast concrete shear wall (1) and the lower end member (8), and a groove is provided at the bottom of the precast concrete shear wall (1), and a steel fiber concrete shear key block (10) is provided in the groove, and the precast concrete shear wall (1) A grouting port (14) is provided on the upper part, and a grouting material (13) is arranged inside the grouting port (14); the upper end of the extended high-strength steel bar (7) passes through the steel fiber concrete shear key block (10) and is connected to the precast concrete shear wall (1); a hole (15) is provided on the steel box (3), and a closed stirrup (5) is provided on the outer wall of the hole (15); a prestressed high-strength steel bar (6) is inserted inside the hole (15), and bolts (12) are provided at the upper and lower ends of the prestressed high-strength steel bar (6), and a threaded anchoring end (11) is provided on the prestressed high-strength steel bar (6).

2. The prefabricated concrete shear wall local prestressed connection structure according to claim 1, characterized in that: The prefabricated concrete shear wall (1) is fixed by binding with the tie bars (2) through transverse steel bars and longitudinal steel bars.

3. The assembled concrete shear wall local prestressed connection structure according to claim 1, characterized in that: A plurality of steel boxes (3) are provided, and a circular hole is opened on the steel box (3).

4. The assembled concrete shear wall local prestressed connection structure according to claim 1, characterized in that: The hole channel (15) is arranged to intersect with the longitudinal bisector of the precast concrete shear wall (1), and the hole channel (15) is fixedly connected to the prestressed high-strength steel bar (6).

5. The local prestressed connection structure of an assembled concrete shear wall according to claim 1, characterized in that: The hole (15) is provided with a reserved bolt hole (4), and the hole (15) is a curved structure.

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