Single-double grouting sleeve mixed connection fabricated concrete frame structure and construction method thereof

Abstract

The invention discloses a single-double grouting sleeve mixed connection assembly type concrete frame structure and a construction method thereof. According to the assembly type concrete frame structure, beam units and column units are assembled and connected through prefabricated node cantilever beam structures, and prefabricated concrete column monomers are assembled and connected through prefabricated node cantilever beam structures; the node cantilever beam structure comprises a node part and 1-4 cantilever beam parts, wherein the node part and the cantilever beam parts are integrally formed. A lengthened grouting sleeve is embedded in the joint part, and the length of a vertical joint between the upper and lower adjacent prefabricated concrete column single bodies is controlled to be 15-25 mm; one end of the cantilever beam part is connected with the node part, an I-shaped semi-grouting sleeve or a combined grouting sleeve is embedded in the other end of the cantilever beam part, and the length of a horizontal joint between a beam unit and a column unit is controlled to be 15-40 mm; according to the frame structure, on-site steel bar binding and concrete pouring are not needed, the assembly rate and the construction efficiency are remarkably improved, the shock resistance of the frame structure is improved while the influence of thermal expansion and cold contraction of concrete is greatly reduced, and good practical value and popularization prospects are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of building industrialization, and particularly relates to a precast concrete frame structure with a hybrid connection of single and double grouting sleeves and a construction method thereof. Background Technique

[0002] Green buildings represented by prefabricated buildings have been widely applied and promoted due to their advantages such as high resource utilization rate, small environmental impact, energy conservation and emission reduction. The precast concrete frame structure has the advantages of flexible building space layout and easy standardized production of precast components, and is one of the main systems promoted and developed in building industrialization. The precast concrete frame structure is an integral structure formed by splicing precast concrete beam units and column units through a reliable connection method.

[0003] At present, due to the limitation of connection technology, the precast concrete frame structure generally adopts composite beams, and the connection between beams and columns generally adopts lap joint of steel bars or single grouting sleeve connection. The connection joint is generally larger than 400 mm, and it is necessary to bind steel bars and pour a large amount of concrete on the construction site. Therefore, the construction workload on the assembly site is relatively large, which is semi-cast-in-place structure construction with a long construction period, far from the goal of building houses like manufacturing cars and building blocks. Moreover, before the cast-in-place concrete reaches the corresponding strength, the strength of the frame structure system is relatively poor, there are potential safety hazards, especially in the node area, angle steel needs to be used for fixing and splicing, and the construction is relatively troublesome. Chinese patent document CN202110568703.4 discloses a connection node structure for a precast frame concrete building, which is assembled through the design of a positioning ring strip, that is, by providing a deformable positioning strip protruding from the side wall of the positioning sleeve, and the positioning strip abuts against the side wall of the insertion hole during the installation and insertion process of the horizontal and vertical rods to complete the connection of the node, so as to avoid the trouble of fixing with angle steel. However, this connection method requires that the specifications of both the horizontal and vertical rods match the positioning strip to achieve the clamping purpose, has high requirements for precast components, and is prone to ineffective connection due to errors in the construction process, especially for the connection at the beam end of the horizontal direction, where there is likely to be an incomplete situation; moreover, this structural node is only connected by the positioning strip, and this positioning strip is a deformable design, and its connection strength stability and strength are also difficult to meet the design requirements, and the practicability is not strong.

[0004] Secondly, in the existing precast concrete frame structure, the connection of precast concrete columns generally uses grouting sleeves, and the grouting sleeves are embedded at the ends of the precast concrete columns. Due to the relatively large stiffness of the grouting sleeves, the deformation capacity and energy dissipation capacity of the precast concrete columns under seismic action are lower than those of the cast-in-place concrete columns, the plastic hinge moves upward, and the seismic performance is affected. Chinese patent document CN202010874091.7 discloses a seismic joint of a fully precast prestressed concrete frame structure, which opens a placement cavity on the frame column and sets a seismic device and a buffer mechanism to achieve the buffer and seismic effect. However, the seismic joint structure is complex, the cost of precast components is high, and it does not have the value of mass production implementation.

[0005] In addition, in the existing precast concrete frame structure with semi-cast-in-place construction connection, when thermal expansion and contraction occur, stress concentration is likely to occur at the connection between the beam and the column, leading to potential safety hazards. Chinese patent document CN202310983346.7 discloses an auxiliary device for connecting precast concrete frame joints, which provides a certain buffer space for the frame beam by setting a backing plate and a concave cavity to reduce the influence of thermal expansion and contraction of the concrete material of the frame column. That is, when thermal expansion and contraction occur, the backing plate structure is compressed and shrunk, and corresponding elastic deformation occurs in the concave cavity, concentrating the thermal expansion and contraction force on the backing plate. However, the setting of the backing plate concave cavity only has a buffer space in the horizontal direction and cannot completely transfer the thermal expansion and contraction force of the frame; at the same time, the backing plate structure itself also has thermal expansion and contraction, and due to material problems, its thermal expansion and contraction amount is different from that of the precast concrete structure. Instead, due to the design of the backing plate and concave cavity structure, it is difficult to ensure the integrity of the connection between the beam and the column after assembly, which reduces the connection strength and is more difficult to ensure the seismic performance of the precast concrete frame.

[0006] Therefore, how to improve the assembly rate and on-site installation efficiency of the precast concrete frame structure, realize that all precast components of the precast concrete frame structure are fully precast components while shortening the construction period, and improve the safety and seismic performance of the precast concrete frame is still an urgent problem to be solved. Summary of the Invention

[0007] Aiming at the above problems existing in the existing precast concrete frame structure, the present invention provides a precast concrete frame structure with a hybrid connection of single and double grouting sleeves and its construction method. The connection between the precast beam and the column adopts a new type of double grouting sleeve connection, which improves the on-site installation efficiency and controls the transverse joint length within the range of 15 - 40 mm and the vertical joint length within the range of 15 - 25 mm, greatly improving the assembly rate and on-site installation efficiency of the precast concrete frame structure. Moreover, the elongated grouting sleeve is embedded in the joint core area, strengthening the stability and seismic capacity of the precast concrete frame. The specific technical solutions are as follows: First, the present invention provides a precast concrete frame structure with a hybrid connection of single and double grouting sleeves, comprising a plurality of column units and a plurality of precast beam units. The beam units are located between the column units. Each column unit includes a plurality of precast concrete column monomers assembled and connected vertically. The beam units and the column units, as well as between the precast concrete column monomers, are assembled and connected through precast joint cantilever beam structures. The joint cantilever beam structure includes an integrally formed joint part and 1 to 4 cantilever beam parts. The joint part is embedded with an extended grouting sleeve for the assembly connection of adjacent precast concrete column monomers above and below, and the vertical joint length between adjacent precast concrete column monomers above and below is controlled within 15 - 25 mm. One end of the cantilever beam part is connected to the joint part, and the other end is embedded with a type-I semi-grouting sleeve or a combined grouting sleeve for the assembly connection with the precast concrete beam unit or with the cantilever beam part of an adjacent joint cantilever beam structure, and the horizontal joint length between the beam unit and the column unit is controlled within 15 - 40 mm.

[0008] For the above-mentioned precast concrete frame structure with a hybrid connection of single and double grouting sleeves, the cantilever beam parts are divided into short cantilever beams and long cantilever beams according to their lengths. The length of the short cantilever beam is 0.2 - 0.6 m. The length of the long cantilever beam is 0.4 - 1.5 m. When the distance between adjacent column units is ≤ 3 m, the columns are connected through the cantilever beam parts of the joint cantilever beam structure. When the distance between adjacent column units is > 3 m, the columns are connected through the precast concrete beam unit and the cantilever beam parts of the joint cantilever beam structure.

[0009] For the above-mentioned precast concrete frame structure with a hybrid connection of single and double grouting sleeves, when the columns are connected through the cantilever beam parts of the joint cantilever beam structure, four type-I semi-grouting sleeves are embedded in one cantilever beam part, and four combined grouting sleeves are correspondingly embedded in the other cantilever beam part. When the columns are connected through the precast concrete beam unit and the cantilever beam part, four type-I semi-grouting sleeves are embedded in the cantilever beam part, and four combined grouting sleeves are correspondingly embedded at both ends of the precast concrete beam unit. The precast concrete column unit and the precast concrete beam unit are assembled together through the connection between the type-I semi-grouting sleeve and the combined grouting sleeve.

[0010] The aforementioned precast concrete frame structure with a hybrid connection of single and double grouting sleeves, wherein the Type I semi-grouting sleeve and the combined grouting sleeve are connected by a conversion steel bar. The length of the Type I semi-grouting sleeve is 8 to 12 times the diameter of the conversion steel bar, and one end thereof is provided with a U-shaped opening and a grout outlet hole. The length of the combined grouting sleeve is the same as that of the conversion steel bar, and it is formed by connecting a Type II semi-grouting sleeve and a straight-opening plastic pipe. The length of the Type II semi-grouting sleeve is the same as that of the Type I semi-grouting sleeve, and one end thereof is provided with a U-shaped opening identical to that of the Type I semi-grouting sleeve. The outer diameter of the straight-opening plastic pipe is the same as the inner diameter of the Type II semi-grouting sleeve. One end thereof is provided with a grout outlet hole, and the other end hole is inserted into the Type II semi-grouting sleeve, and its opening side corresponds to the U-shaped opening on the Type II semi-grouting sleeve. The U-shaped opening is used for welding with the longitudinal steel bar in the cantilever beam part of the joint cantilever beam structure or the precast concrete beam unit to fix the embedding. Conversion steel bar supports are arranged in both the Type I semi-grouting sleeve and the Type II semi-grouting sleeve, used to support the conversion steel bar on the central axis of the Type I semi-grouting sleeve and the Type II semi-grouting sleeve, and are connected by high-strength grouting material with a final strength not less than 70 Mpa.

[0011] In the aforementioned precast concrete frame structure with a hybrid connection of single and double grouting sleeves, the length of the U-shaped opening is 30 to 60 mm, and the diameter of the grout outlet hole is 20 to 25 mm. For the combined grouting sleeve, the length of the straight-opening plastic pipe inserted into the Type II semi-grouting sleeve is 5 to 20 mm. A number of annular grooves and annular ribs are arranged on both the Type I semi-grouting sleeve and the Type II semi-grouting sleeve. The annular grooves are arranged on the surface of the sleeve, and the annular ribs are arranged inside the sleeve, and the positions of the annular grooves and the annular ribs correspond to each other.

[0012] In the aforementioned precast concrete frame structure with a hybrid connection of single and double grouting sleeves, the height of the annular rib and the depth of the annular groove are both preferably 1 to 3 mm, and the spacing between adjacent annular ribs or adjacent annular grooves is not greater than 25 mm.

[0013] In the aforementioned precast concrete frame structure with a hybrid connection of single and double grouting sleeves, the length of the conversion steel bar is 16 to 24 times its diameter plus the length of the horizontal joint, which is 15 to 40 mm. The conversion steel bar support is a V-shaped, Y-shaped, or X-shaped support fixedly arranged in the Type I semi-grouting sleeve and the Type II semi-grouting sleeve.

[0014] In the aforementioned precast concrete frame structure with a hybrid connection of single and double grouting sleeves, the extended grouting sleeve penetrates through the joint part. The two ends of the precast concrete column monomer are provided with extended steel bars matching the extended grouting sleeve. After the extended steel bars of the upper and lower precast concrete column monomers extend into the extended grouting sleeve from the upper and lower sides of the joint part, they are connected by high-strength grouting material with a final strength not less than 70 Mpa.

[0015] The aforementioned precast concrete frame structure with combined single and double grouting sleeves is connected to the cast-in-place foundation structure through type III semi-grouting sleeves. The type III semi-grouting sleeves are embedded in the foundation structure and are ordinary semi-grouting sleeves without slurry inlet and outlet. After the extended steel bars at the ends of the precast concrete column monomers of the precast concrete frame column units are inserted into the type III semi-grouting sleeves, they are grouted and connected with high-strength grouting material with a final strength not lower than 70 Mpa.

[0016] Secondly, the present invention also provides a construction method for the aforementioned precast concrete frame structure with combined single and double grouting sleeves, which includes the following steps: 1) Assembly preparation: Fabricate beam units, precast concrete column monomers, and node cantilever beam structures according to the design requirements, and pour the foundation structure according to the design requirements. 2) Install the first-layer precast column: Insert the extended steel bars at the lower end of the precast concrete column monomer located on the first layer into the type III semi-grouting sleeves embedded in the foundation structure, control the vertical joint between the precast concrete column monomer and the foundation structure within 15 - 25 mm, use formwork to seal the vertical joint, and pour high-strength grouting material through the grouting port reserved on the formwork. 3) Install the node cantilever beam structure: Hoist each node cantilever beam structure above the corresponding precast concrete column monomer according to the design requirements. For the cantilever beam part provided with combined grouting sleeves, place conversion steel bars in its combined grouting sleeves in advance; control the vertical joint between the node cantilever beam structure and the precast concrete column monomer within 15 - 25 mm; insert the extended steel bars at the upper end of the precast concrete column monomer into the extended grouting sleeves buried in the node part of the node cantilever beam structure, use formwork to seal the vertical joint, and pour high-strength grouting material from the top of the extended grouting sleeve. Stop grouting when the slurry just covers the extended steel bars at the lower part of the sleeve. 4) Install the beam unit: Place the conversion steel bars in the combined grouting sleeves of the beam unit in advance, and then hoist it to the designated position. Control the horizontal joint between the beam unit and the cantilever beam part of the node cantilever beam structure within 15 - 40 mm, and align the combined grouting sleeve inside it with the type I semi-grouting sleeve of the cantilever beam part of the node cantilever beam structure; Move the conversion steel bars in the combined grouting sleeves of the beam unit and the cantilever beam part so that the length of the conversion steel bars entering the type I semi-grouting sleeve of the cantilever beam part of the corresponding node cantilever beam structure is equal to the remaining length in the combined grouting sleeve. Use formwork to seal the horizontal joint and pour high-strength grouting material from the top of the horizontal joint. 5) Install the second-layer precast column: Hoist the precast concrete column monomer located on the second layer to the corresponding position, insert the extended steel bars at its lower end into the upper part of the extended grouting sleeve buried in the node part of the node cantilever beam structure, control the vertical joint between the node cantilever beam structure and the precast concrete column monomer within 15 - 25 mm; Seal the vertical joint and pour high-strength grouting material through the grouting port reserved on the formwork. 6) Install the upper structure: Repeat steps 3), 4), and 5) until the construction of the precast concrete frame structure is completed.

[0017] The beneficial effects of the present invention are as follows: Compared with the prior art, the present invention has the following beneficial effects: 1) All precast concrete components of the precast concrete frame structure of the present invention, including precast columns and precast beams, are fully precast components, which solves the problems of binding steel bars and pouring concrete on the assembly site.

[0018] 2) The columns and beams of the precast concrete frame structure of the present invention are connected by sleeves + conversion steel bars, so that the horizontal connection joint is a small joint, with a length of only 15 - 40 mm, greatly reducing the influence of thermal expansion and contraction of the post-cast concrete. Moreover, the columns and beams are connected by sleeves + conversion steel bars. In this way, the manufacturing dimensional accuracy requirements for precast components are not so strict, which is convenient for production and assembly; in addition, the horizontal direction is connected by sleeves + conversion steel bars, and the vertical direction is connected by extending the steel bars at the end of the precast column and connecting them with extended or semi-grouting sleeves, which not only allows the entire structure to have expansion and contraction margin space in both horizontal and vertical directions during thermal expansion and contraction.

[0019] 3) The single and double grouting sleeves of the present invention are low-cost. The proposed Type I semi-grouting sleeve and Type II semi-grouting sleeve are both low-cost semi-grouting sleeves, and the total length of the two types of grouting sleeves is approximately equal to the length of a traditional full-grouting sleeve; the combined grouting sleeve is spliced by a Type II semi-grouting sleeve and a low-cost plastic pipe, and its cost is much lower than that of an extended all-steel grouting sleeve; a large amount of material cost is saved.

[0020] 4) In the construction method of the present invention, when splicing the beam and column, only the conversion steel bars placed in the combined sleeve need to be moved to the corresponding Type II semi-grouting sleeve, and then grouting construction can be carried out without tying steel bars on site, simplifying the construction steps and shortening the construction time; moreover, the grouting construction of the present invention all adopts the gravity grouting method without using a pressure grouting machine for grouting; further saving construction costs and improving assembly efficiency.

[0021] 5) The extended grouting sleeves of the precast concrete frame structure of the present invention are embedded in the joint core area and the foundation, avoiding the problem of relatively large stiffness caused by directly embedding the grouting sleeve at the bottom of the precast column, significantly enhancing the seismic resistance of the column end and the joint core area, and having good practical value and promotion prospects. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of a precast concrete frame structure with a hybrid connection of single and double grouting sleeves of the present invention; Figure 2Schematic diagram of the node cantilever beam structure of the assembled concrete frame with hybrid connection of single and double grouting sleeves according to the present invention; Figure 3 Another schematic diagram of the node cantilever beam of the assembled concrete frame with hybrid connection of single and double grouting sleeves according to the present invention; Figure 4 Schematic diagram of the beam unit structure of the assembled concrete frame with hybrid connection of single and double grouting sleeves according to the present invention; Figure 5 Schematic diagram of the connection structure between the node cantilever beam and the beam unit of the assembled concrete frame with hybrid connection of single and double grouting sleeves according to the present invention; Figure 6 Cross-sectional schematic diagram of the embedded type-II semi-grouting sleeve of the beam unit of the assembled concrete frame with hybrid connection of single and double grouting sleeves according to the present invention; Figure 7 Schematic diagram of the type-II semi-grouting sleeve of the assembled concrete frame with hybrid connection of single and double grouting sleeves according to the present invention; Figure 8 Schematic diagram of the straight open plastic pipe of the assembled concrete frame with hybrid connection of single and double grouting sleeves according to the present invention; Figure 9 Schematic diagram of the longitudinal reinforcement welded to the type-II semi-grouting sleeve of the assembled concrete frame with hybrid connection of single and double grouting sleeves according to the present invention; Figure 10 Schematic diagram of the connection between the type-I semi-grouting sleeve and the combined grouting sleeve of the assembled concrete frame with hybrid connection of single and double grouting sleeves according to the present invention; Figure 11 Schematic diagram of the construction process of Embodiment 2 of the present invention.

[0023] In the figure: 1. Column unit; 101. Prefabricated concrete column monomer; 1011. Extended steel bar; 2. Beam unit; 3. Node cantilever beam structure; 301. Node part; 302. Cantilever beam part; 4. Horizontal joint; 5. Vertical joint; 6. Extended grouting sleeve; 7. Type-I semi-grouting sleeve; 8. Combined grouting sleeve; 801. Type-II semi-grouting sleeve; 802. Straight open plastic pipe; 9. Conversion steel bar; 10. U-shaped opening; 11. Grout outlet hole; 12. Longitudinal reinforcement; 13. Conversion steel bar support; 14. High-strength grouting material; 15. Type-III semi-grouting sleeve; 16. Foundation structure. Detailed implementation manners

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings. Obviously, the described embodiments are only the preferred embodiments of the present invention, rather than all embodiments, nor are they other forms of limitation to the present invention. Any person skilled in the relevant art may make changes or equivalent modifications using the disclosed technical content. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

[0025] Embodiment 1 This embodiment is a precast concrete frame structure with a hybrid connection of single and double grouting sleeves. As Figures 1 to 10 shown, it includes a plurality of column units 1 and a plurality of precast beam units 2. The beam units 2 are located between the column units 1. The column unit 1 includes a plurality of precast concrete column monomers 101 assembled and connected up and down; both between the beam unit 2 and the column unit 1 and between the precast concrete column monomers 101 are assembled and connected through a precast joint cantilever beam structure 3; the joint cantilever beam structure 3 includes an integrally formed joint part 301 and 1 to 4 cantilever beam parts 302; the joint part 301 is embedded with an extended grouting sleeve 6 for assembling and connecting the adjacent precast concrete column monomers 101 up and down, and controlling the length of the vertical joint 5 between the adjacent precast concrete column monomers 101 up and down within 15 - 25 mm; one end of the cantilever beam part 302 is connected to the joint part 301, and the other end is embedded with a type I semi-grouting sleeve 7 or a combined grouting sleeve 8 for assembling and connecting with the precast concrete beam unit 2 or with the cantilever beam part 302 of the adjacent joint cantilever beam structure 3, and controlling the length of the horizontal joint 4 between the beam unit 2 and the column unit 1 within 15 - 40 mm, solving the problems of tying steel bars and pouring concrete on the assembly site, greatly reducing the influence of thermal expansion and contraction of the post-cast concrete, and the extended grouting sleeve is embedded in the joint core area and the foundation, avoiding the problem of relatively large stiffness caused by directly embedding the grouting sleeve at the bottom of the precast column, and significantly improving the seismic capacity of the column end and the joint core area.

[0026] In the single-double grouting sleeve mixed connection prefabricated concrete frame structure described in this embodiment, the cantilever beam portion 302 is divided into a short cantilever beam and a long cantilever beam according to its length; the length of the short cantilever beam is 0.2 to 0.6 m; the length of the short cantilever beam is 0.4 to 1.5 m; when the distance between adjacent column units 1 is ≤3 m, the columns are connected by the cantilever beam portion 302 of the node cantilever beam structure 3; when the distance between adjacent column units 1 is >3 m, the columns are connected by the precast concrete beam unit 2 and the cantilever beam portion 302 of the node cantilever beam structure 3. When the columns are connected through the cantilever beam portion 302 of the node cantilever beam structure 3, four Type I semi-grouting sleeves 7 are buried in one of the cantilever beam portions 302, and four combined grouting sleeves 8 are buried in the other cantilever beam portion 302; when the columns are connected through the precast concrete beam unit 2 and the cantilever beam portion 302, four Type I semi-grouting sleeves 7 are buried in the cantilever beam portion 302, and four combined grouting sleeves 8 are buried at both ends of the precast concrete beam unit 2; the precast concrete column unit 1 and the precast concrete beam unit 2 are assembled together by connecting the Type I semi-grouting sleeves 7 and the combined grouting sleeves 8.

[0027] In this embodiment, the type I semi-grouting sleeve 7 is connected to the combined grouting sleeve 8 through the conversion steel bar 9. The length of the type I semi-grouting sleeve 7 is 8 to 12 times the diameter of the conversion steel bar 9, and one end of the type I semi-grouting sleeve is provided with a U-shaped opening 10 and a grouting hole 11; the length of the combined grouting sleeve 8 is the same as the length of the conversion steel bar 9, and it is formed by connecting a type II semi-grouting sleeve 801 and a straight open plastic pipe 802; the type II semi-grouting sleeve 801 is the same length as the type I semi-grouting sleeve 7, and one end of the type II semi-grouting sleeve is provided with a U-shaped opening 10 similar to the type I semi-grouting sleeve 7; the outer diameter of the straight open plastic pipe 802 is the same as the inner diameter of the type II semi-grouting sleeve 801, one end of the type II semi-grouting sleeve is provided with a grouting hole 11, and the other end hole is inserted into the type II semi-grouting sleeve 801, and its open side corresponds to the U-shaped opening 10 on the type II semi-grouting sleeve 801; the U-shaped opening 10 Used to be welded with the cantilever beam portion 302 of the node cantilever beam structure 3 or the longitudinal steel bars 12 in the precast concrete beam unit 2 for fixed embedment; the function of the grouting hole 11 is to discharge the air inside the grouting sleeve during grouting to make the grouting dense, that is, when the grouting material can smoothly flow out of the grouting hole, it is considered that the air has been exhausted; the type I semi-grouting sleeve 7 and the type II semi-grouting sleeve 801 are both provided with a conversion steel bar bracket 13, which is used to support the conversion steel bar 9 on the central axis of the type I semi-grouting sleeve 7 and the type II semi-grouting sleeve 801, and to be connected by pouring high-strength grouting material 14 with a final strength of not less than 70Mpa, such as the JM sleeve special grouting material developed by Beijing Sida Jianmao Technology Development Co., Ltd., including CGMJM-V special for joints, ultra-high strength type VIII and negative temperature VID1 series grouting materials, etc.

[0028] In the precast concrete frame structure with hybrid connection of single and double grouting sleeves described in this embodiment, the length of the U-shaped opening 10 is 30 - 60 mm, and the diameter of the grout outlet hole 11 is 20 - 25 mm; for the combined grouting sleeve 8, the length of the straight-opening plastic pipe 802 inserted into the Type-II semi-grouting sleeve 801 is 5 - 20 mm; both the Type-I semi-grouting sleeve 7 and the Type-II semi-grouting sleeve 801 are provided with a number of annular grooves and annular ribs. The annular grooves are arranged on the surface of the sleeve, and the annular ribs are arranged inside the sleeve, and the positions of the annular grooves and annular ribs correspond to each other one by one. Preferably, the height of the annular rib and the depth of the annular groove are both 1 - 3 mm, and the spacing between adjacent annular ribs or adjacent annular grooves is not greater than 25 mm; the length of the conversion steel bar 9 is 16 - 24 times its diameter plus the length of the horizontal joint 4, which is 15 - 40 mm; the conversion steel bar support 13 is a V-shaped, Y-shaped, or X-shaped support fixedly arranged inside the Type-I semi-grouting sleeve 7 and the Type-II semi-grouting sleeve 801.

[0029] In the precast concrete frame structure with hybrid connection of single and double grouting sleeves described in this embodiment, both the inclined Type-I semi-grouting sleeve 7 and the combined grouting sleeve 8 are equipped with rubber sleeves; the rubber sleeve of the Type-I semi-grouting sleeve 7 is arranged at the end opposite to the Type-II semi-grouting sleeve 801, and the rubber sleeve of the combined grouting sleeve 8 is arranged at the end of the straight-opening plastic pipe 802, which is used to prevent concrete from entering the Type-I semi-grouting sleeve 7 and the combined grouting sleeve 8 when precasting the concrete shear wall; the edge of the rubber sleeve is provided with an anchor bar through-hole, and the anchor bar through-hole is in interference fit with the longitudinal steel bar 12 in the cantilever beam part 302 of the beam unit 2 or the node cantilever beam structure 3, which is used for positioning and inserting the longitudinal steel bar 12 into the Type-I semi-grouting sleeve 7 and the combined grouting sleeve 8 and then welding it with the U-shaped opening 10.

[0030] In the precast concrete frame structure with hybrid connection of single and double grouting sleeves described in this embodiment, the extended grouting sleeve 6 penetrates through the node part 301, and the two ends of the precast concrete column monomer 101 are provided with extended steel bars 1011 that match the extended grouting sleeve 6; after the extended steel bars 1011 of the upper and lower precast concrete column monomers 101 extend into the extended grouting sleeve 6 from the upper and lower surfaces of the node part 301, they are connected by grouting with high-strength grouting material 14 whose final strength is not lower than 70 Mpa.

[0031] The assembled concrete frame structure with hybrid connection of single and double grouting sleeves described in this embodiment is connected to the cast-in-place foundation structure 16 through the type-III semi-grouting sleeve 15. The type-III semi-grouting sleeve 15 is embedded in the foundation structure 16 and is an ordinary semi-grouting sleeve without a grout inlet and a grout outlet. After the extended steel bars 1011 at the end of the precast concrete column monomer 101 of the assembled concrete frame column unit 1 are inserted into the type-III semi-grouting sleeve 15, they are connected by pouring high-strength grouting material 14 with a final strength not lower than 70 Mpa.

[0032] The lengthened grouting sleeve 6, type-I semi-grouting sleeve 7, type-II semi-grouting sleeve 801, and type-III semi-grouting sleeve 15 described in this embodiment are all processed from seamless steel pipes of Q235, Q345, or Q390 to ensure the connection strength at the splicing joints of the concrete frame structure.

[0033] Embodiment 2 This embodiment is a construction method for the assembled concrete frame structure with hybrid connection of single and double grouting sleeves described in Embodiment 1. The grouting materials used in this embodiment are all ultra-high-strength type-VIII JM sleeve special grouting materials developed by Beijing Sida Jianmao Technology Development Co., Ltd. The specific construction process is as follows: As Figure 11-1 to Figure 11-6 shown, 1) Assembly preparation: Fabricate the precast concrete column monomer 101, beam unit 2, and node cantilever beam structure 3 according to the design requirements, and pour the foundation structure 16 according to the design requirements. 2) Install the first-layer precast column: Insert the extended steel bars 1011 at the lower end of the precast concrete column monomer 101 located on the first layer into the type-III semi-grouting sleeve 15 embedded in the foundation structure 16. Control the vertical joint 5 between the precast concrete column monomer 101 and the foundation structure 16 to be 15 - 25 mm. Use a template to seal the vertical joint 5, and then pour high-strength grouting material 14 from the grouting port reserved on the template, as Figure 11-1 shown; 3) Install the node cantilever beam structure: Hoist each node cantilever beam structure 3 above the corresponding precast concrete column monomer 101 according to the design requirements. For the cantilever beam part 302 provided with the combined grouting sleeve 8, place the conversion steel bar 9 in its combined grouting sleeve 8 in advance. Control the vertical joint 5 between the node cantilever beam structure 3 and the precast concrete column monomer 101 to be 15 - 25 mm. Insert the extended steel bars 1011 at the upper end of the precast concrete column monomer 101 into the lengthened grouting sleeve 6 buried in the node part 301 of the node cantilever beam structure 3. Use a template to seal the vertical joint 5, and pour high-strength grouting material 14 from the top of the lengthened grouting sleeve 6. Stop grouting when the slurry just covers the extended steel bars 1011 at the lower part of the sleeve, as Figure 11-2 shown; 4) Install the beam element: Place the conversion steel bar 9 into the combined grouting sleeve 8 of the beam element 2 in advance, and then hoist it to the designated position. The horizontal joint 4 between the beam element 2 and the cantilever beam part 302 of the joint cantilever beam structure 3 is controlled to be 15 - 40 mm, and align the combined grouting sleeve 8 therein with the type-I semi-grouting sleeve 7 of the cantilever beam part 302 of the joint cantilever beam structure 3; Use a pair of needle-nose pliers to move the conversion steel bar 9 in the combined grouting sleeves 8 of the beam element 2 and the cantilever beam part 302 so that it enters the type-I semi-grouting sleeve 7 of the corresponding cantilever beam part 302 of the joint cantilever beam structure 3. The length of the conversion steel bar 9 entering the type-I semi-grouting sleeve 7 is equal to its remaining length in the combined grouting sleeve 8. Seal the horizontal joint 4 with a template and pour high-strength grouting material 14 from the top of the horizontal joint 4, as Figure 11-3 to Figure 11-5 shown; 5) Install the second-layer precast column: Hoist the precast concrete column unit 101 on the second layer to the corresponding position, insert the extended steel bar 1011 at its lower end into the upper part of the extended grouting sleeve 6 embedded in the joint part 301 of the joint cantilever beam structure 3, and control the vertical joint 5 between the joint cantilever beam structure 3 and the precast concrete column unit 101 to be 15 - 25 mm; Seal the vertical joint 5 and pour high-strength grouting material 14 from the grouting port reserved on the template, as Figure 11-6 shown; 6) Install the upper structure: Repeat steps 3), 4), and 5) until the construction of the precast concrete frame structure is completed.

[0034] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. In addition, it should be understood that although this specification is described according to the embodiments, it does not only contain one technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A precast concrete frame structure with a hybrid connection of single and double grouting sleeves, comprising a plurality of column units (1) and a plurality of precast beam units (2). The beam units (2) are located between the column units (1). The column units (1) include a plurality of precast concrete column monomers (101) assembled and connected vertically. It is characterized in that: The beam units (2) and the column units (1), as well as between the precast concrete column monomers (101), are all assembled and connected through precast joint cantilever beam structures (3). The joint cantilever beam structure (3) includes an integrally formed joint part (301) and 1 to 4 cantilever beam parts (302). The joint part (301) is embedded with an extended grouting sleeve (6) for the assembly connection of adjacent precast concrete column monomers (101) up and down, and the length of the vertical joint (5) between adjacent precast concrete column monomers (101) is controlled within 15 - 25 mm. One end of the cantilever beam part (302) is connected to the joint part (301), and the other end is embedded with a type-I semi-grouting sleeve (7) or a combined grouting sleeve (8) for the assembly connection with the precast concrete beam unit (2) or with the cantilever beam part (302) of an adjacent joint cantilever beam structure (3), and the length of the horizontal joint (4) between the beam unit (2) and the column unit (1) is controlled within 15 - 40 mm.

2. The precast concrete frame structure with a hybrid connection of single and double grouting sleeves according to claim 1, wherein: The cantilever beam part (302) is divided into a short cantilever beam and a long cantilever beam according to its length. The length of the short cantilever beam is 0.2 - 0.6 m. The length of the long cantilever beam is 0.4 - 1.5 m. When the distance between adjacent column units (1) ≤ 3 m, the columns are connected through the cantilever beam part (302) of the joint cantilever beam structure (3). When the distance between adjacent column units (1) > 3 m, the columns are connected through the precast concrete beam unit (2) and the cantilever beam part (302) of the joint cantilever beam structure (3).

3. The precast concrete frame structure with a hybrid connection of single and double grouting sleeves according to claim 2, wherein: When the columns are connected through the cantilever beam part (302) of the joint cantilever beam structure (3), four type-I semi-grouting sleeves (7) are embedded in one cantilever beam part (302), and four combined grouting sleeves (8) are correspondingly embedded in the other cantilever beam part (302). When the columns are connected through the precast concrete beam unit (2) and the cantilever beam part (302), four type-I semi-grouting sleeves (7) are embedded in the cantilever beam part (302), and four combined grouting sleeves (8) are correspondingly embedded at both ends of the precast concrete beam unit (2). The precast concrete column unit (1) and the precast concrete beam unit (2) are assembled together through the connection between the type-I semi-grouting sleeve (7) and the combined grouting sleeve (8).

4. The precast concrete frame structure with a hybrid connection of single and double grouting sleeves according to claim 3, wherein: The type-I semi-grouting sleeve (7) and the combined grouting sleeve (8) are connected through a conversion steel bar (9). The length of the Type-I semi-grouting sleeve (7) is 8 to 12 times the diameter of the transfer steel bar (9), and one end thereof is provided with a U-shaped opening (10) and a grout outlet hole (11); The length of the combined grouting sleeve (8) is the same as that of the transfer steel bar (9), and it is formed by connecting a Type-II semi-grouting sleeve (801) and a straight-opening plastic pipe (802); The length of the Type-II semi-grouting sleeve (801) is the same as that of the Type-I semi-grouting sleeve (7), and one end thereof is provided with a U-shaped opening (10) same as that of the Type-I semi-grouting sleeve (7); The outer diameter of the straight-opening plastic pipe (802) is the same as the inner diameter of the Type-II semi-grouting sleeve (801). One end thereof is provided with a grout outlet hole (11), and the other end hole is inserted into the Type-II semi-grouting sleeve (801), and its opening side corresponds to the U-shaped opening (10) on the Type-II semi-grouting sleeve (801); The U-shaped opening (10) is used for welding and fixing with the longitudinal steel bar (12) in the cantilever beam part (302) of the joint cantilever beam structure (3) or the precast concrete beam unit (2); Both the Type-I semi-grouting sleeve (7) and the Type-II semi-grouting sleeve (801) are provided with transfer steel bar supports (13) for supporting the transfer steel bar (9) on the central axes of the Type-I semi-grouting sleeve (7) and the Type-II semi-grouting sleeve (801), and are connected by grouting with a high-strength grouting material (14) whose final strength is not less than 70 Mpa.

5. The assembled concrete frame structure with single and double grouting sleeve hybrid connection according to claim 4, characterized in that: The length of the U-shaped opening (10) is 30 to 60 mm, and the diameter of the grout outlet hole (11) is 20 to 25 mm; For the combined grouting sleeve (8), the length of the straight-opening plastic pipe (802) inserted into the Type-II semi-grouting sleeve (801) is 5 to 20 mm; Both the Type-I semi-grouting sleeve (7) and the Type-II semi-grouting sleeve (801) are provided with a plurality of annular grooves and annular ribs. The annular grooves are arranged on the surface of the sleeve, and the annular ribs are arranged inside the sleeve, and the positions of the annular grooves and the annular ribs correspond one by one.

6. The assembled concrete frame structure with single and double grouting sleeve hybrid connection according to claim 5, wherein: The height of the annular rib and the depth of the annular groove are both 1 to 3 mm, and the distance between adjacent annular ribs or adjacent annular grooves is not greater than 25 mm.

7. The assembled concrete frame structure with single and double grouting sleeve hybrid connection according to claim 4, characterized in that: The length of the transfer steel bar (9) is 16 to 24 times its diameter plus the length of the horizontal joint (4) which is 15 to 40 mm; The transfer steel bar support (13) is a V-shaped, Y-shaped, or X-shaped support fixedly arranged in the Type-I semi-grouting sleeve (7) and the Type-II semi-grouting sleeve (801).

8. The assembled concrete frame structure with single and double grouting sleeve hybrid connection according to claim 1, wherein: The extended grouting sleeve (6) penetrates through the joint part (301), and both ends of the precast concrete column monomer (101) are provided with extended steel bars (1011) matching with the extended grouting sleeve (6); after the extended steel bars (1011) of the upper and lower two precast concrete column monomers (101) extend into the extended grouting sleeve (6) from the upper and lower surfaces of the joint part (301), they are connected by grouting with a high-strength grouting material (14) whose final strength is not less than 70 Mpa.

9. The hybrid-connected precast concrete frame structure with single and double grouting sleeves according to claim 8, characterized in that: The precast concrete frame is connected to the cast-in-situ foundation structure (16) through a Type-III semi-grouting sleeve (15); The Type III semi-grouting sleeve (15) is embedded in the foundation structure (16), which is a common semi-grouting sleeve without grout inlet and outlet. After the extended steel bars (1011) at the end of the precast concrete column monomer (101) of the precast concrete frame column unit (1) are inserted into the Type III semi-grouting sleeve (15), they are connected by pouring high-strength grouting material (14) with a final strength not less than 70 Mpa.

10. A construction method for a precast concrete frame structure with a hybrid connection of single and double grouting sleeves according to any one of claims 1-9, characterized in that: It includes the following steps: 1) Assembly preparation: Fabricate beam units (2), precast concrete column monomers (101), and joint cantilever beam structures (3) according to the design requirements, and pour the foundation structure (16) according to the design requirements. 2) Install the first-layer precast column: Insert the extended steel bars (1011) at the lower end of the precast concrete column monomer (101) located on the first layer into the Type III semi-grouting sleeve (15) embedded in the foundation structure (16), control the vertical joint (5) between the precast concrete column monomer (101) and the foundation structure (16) to be 15 - 25 mm, use formwork to seal the vertical joint (5), and pour high-strength grouting material (14) with a final strength not less than 70 Mpa from the grouting port reserved on the formwork. 3) Install the joint cantilever beam structure: Hoist each joint cantilever beam structure (X) above the corresponding precast concrete column monomer (101) according to the design requirements. For the cantilever beam part (302) provided with a combined grouting sleeve (8), place the conversion steel bars (9) in its combined grouting sleeve (8) in advance; control the vertical joint (5) between the joint cantilever beam structure (3) and the precast concrete column monomer (101) to be 15 - 25 mm; insert the extended steel bars (1011) at the upper end of the precast concrete column monomer (101) into the extended grouting sleeve (6) embedded in the joint part (301) of the joint cantilever beam structure (3), use formwork to seal the vertical joint (5), and pour high-strength grouting material (14) with a final strength not less than 70 Mpa from the top of the extended grouting sleeve (6), and stop grouting when the grout just covers the extended steel bars (1011) at the lower part of the sleeve. 4) Install the beam unit: Place the conversion steel bars (9) in the combined grouting sleeve (8) of the beam unit (2) in advance, and then hoist it to the designated position. Control the horizontal joint (4) between the beam unit (2) and the cantilever beam part (302) of the joint cantilever beam structure (3) to be 15 - 40 mm, and align the combined grouting sleeve (8) inside it with the Type I semi-grouting sleeve (7) of the cantilever beam part (302) of the joint cantilever beam structure (3); Move the conversion steel bars (9) in the combined grouting sleeves (8) of the beam unit (2) and the cantilever beam part (302) so that the length of the conversion steel bars (9) entering the Type I semi-grouting sleeve (7) of the cantilever beam part (302) of the corresponding joint cantilever beam structure (3) is equal to the remaining length in the combined grouting sleeve (8), use formwork to seal the horizontal joint (4), and pour high-strength grouting material (14) with a final strength not less than 70 Mpa from the top of the horizontal joint (4). 5) Install the second - layer precast column: Hoist the single - piece precast concrete column (101) on the second layer to the corresponding position. The extended steel bars (1011) at its lower end are inserted into the upper part of the lengthened grouting sleeve (6) embedded in the joint part (301) of the joint cantilever beam structure (3). Control the vertical joint (5) between the joint cantilever beam structure (3) and the single - piece precast concrete column (101) to be 15 - 25 mm; seal the vertical joint (5), and pour high - strength grouting material (14) with a final strength not lower than 70 Mpa from the grouting port reserved on the formwork. 6) Install the upper - layer structure: Repeat steps 3), 4), and 5) until the construction of the precast concrete frame structure is completed.

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