Threaded steel anti-floating anchor rod lengthening connecting device

Abstract

The application discloses a threaded steel anti-floating anchor rod lengthening connecting device, which comprises a lower threaded steel anti-floating anchor rod, a threaded sleeve, a threaded hole in the center of the threaded sleeve, the threaded sleeve being threaded on the upper end of the lower threaded steel anti-floating anchor rod, an upper threaded steel anti-floating anchor rod, the lower end of the upper threaded steel anti-floating anchor rod being threaded in the threaded hole, a sleeve pipe, the sleeve pipe being sleeved on the outer periphery of the threaded sleeve, a first adapter pipe, the upper end of the first adapter pipe being sleeved on the sleeve pipe and the lower end of the first adapter pipe being sleeved on the lower threaded steel anti-floating anchor rod, and a second adapter pipe, the lower end of the second adapter pipe being sleeved on the sleeve pipe and the upper end of the second adapter pipe being sleeved on the upper threaded steel anti-floating anchor rod. The first adapter pipe, the sleeve pipe and the second adapter pipe jointly enclose an isolation protection cavity, the threaded connection node is wrapped in the isolation protection cavity, and the external concrete slurry and moisture are prevented from invading. The threaded sleeve is mechanically connected through the threaded connection, the total length of the anchor rod can be quickly lengthened, the anchoring length of the anchor rod is supplemented, and the requirement during the tensioning of the anchor rod is ensured.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular, to a threaded steel anti-buoyancy anchor rod extension connection device. Background Technology

[0002] In basement prestressed anti-buoyancy anchor bolt projects, precision-rolled threaded steel anti-buoyancy anchor bolts are widely used due to their advantages such as high strength, reliable anchoring, and convenient construction. Under conventional construction techniques, the lower part of the anchor bolt reinforcement is embedded in the rock layer to meet the required embedment depth. After the bottom slab concrete is poured, prestressing tensioning is carried out on the slab surface. Affected by site factors such as fluctuations in rock layer elevation and deviations in hole depth, the length of the top reinforcement of the anchor bolt is often insufficient to meet the required embedment depth at the bottom of the anchor bolt, thus failing to meet the structural standards for prestressing tensioning. Existing conventional splicing methods only use simple threaded sleeves to directly connect the reinforcement, without a closed isolation cavity at the connection point. During the bottom slab concrete pouring process, cement slurry can easily seep in and wrap around the reinforcement and connecting sleeve, destroying the unbonded working state between the anchor bolt and the bottom slab concrete, making subsequent tensioning operations impossible. Secondly, the corrosion resistance of the connection node is weak. The threaded meshing part is in long-term contact with groundwater and the alkaline medium of concrete, which is prone to corrosion, thereby reducing the connection strength and structural durability. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an extended connection device for threaded steel anti-buoyancy anchor rods.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An extended connection device for threaded steel anti-buoyancy anchor rods includes: a lower threaded steel anti-buoyancy anchor rod; a threaded sleeve with a threaded hole in the center, threadedly fitted onto the upper end of the lower threaded steel anti-buoyancy anchor rod; an upper threaded steel anti-buoyancy anchor rod with its lower end threadedly connected to the threaded hole; a sleeve fitted around the outer periphery of the threaded sleeve; a first adapter pipe with its upper end fitted around the outer periphery of the lower end of the sleeve and its lower end fitted around the outer periphery of the lower threaded steel anti-buoyancy anchor rod; and a second adapter pipe with its lower end fitted around the outer periphery of the upper end of the sleeve and its upper end fitted around the outer periphery of the upper threaded steel anti-buoyancy anchor rod.

[0005] Furthermore, the first adapter pipe includes a first large-diameter pipe, a first tapered pipe, and a first small-diameter pipe coaxially connected from top to bottom. The first large-diameter pipe is sleeved on the outer periphery of the lower end of the sleeve, and the first small-diameter pipe is sleeved on the outer periphery of the lower threaded steel anti-buoyancy anchor rod. The diameter of the first large-diameter pipe is larger than the diameter of the first small-diameter pipe. The first tapered pipe is tapered downwards, with one end connected to the first large-diameter pipe and the other end connected to the first small-diameter pipe. A first sealing filling groove is formed between the first tapered pipe and the outer periphery of the lower threaded steel anti-buoyancy anchor rod for filling with grease.

[0006] Furthermore, the second adapter pipe includes a second large-diameter pipe, a second tapered pipe, and a second small-diameter pipe that are coaxially connected from bottom to top. The second large-diameter pipe is sleeved on the outer periphery of the upper end of the sleeve, and the second small-diameter pipe is sleeved on the outer periphery of the upper threaded steel anti-buoyancy anchor rod. The diameter of the second large-diameter pipe is larger than the diameter of the second small-diameter pipe. The second tapered pipe is tapered upwards, with one end connected to the second large-diameter pipe and the other end connected to the second small-diameter pipe. A second sealing filling groove is formed between the second tapered pipe and the outer periphery of the upper threaded steel anti-buoyancy anchor rod for filling with grease.

[0007] Furthermore, the sleeve and the threaded sleeve are in a clearance fit so that the grease can penetrate into the gap between the sleeve and the threaded sleeve.

[0008] Furthermore, a first isolation pipe is sleeved around the outer periphery of the lower threaded steel anti-buoyancy anchor rod. The first isolation pipe is located below the first transfer pipe and is connected to the first transfer pipe. A first sealing structure is provided at the connection between the first isolation pipe and the first transfer pipe.

[0009] Furthermore, the first sealing structure includes a first sealing tape wrapped around the joint between the first isolation tube and the first adapter tube, the outer periphery of which is coated with epoxy resin sealant.

[0010] Furthermore, a second isolation tube is sleeved on the outer periphery of the upper threaded steel anti-buoyancy anchor rod. The second isolation tube is located above the second adapter pipe and is connected to the second adapter pipe. A second sealing tape is wrapped around the connection between the second isolation tube and the second adapter pipe. The outer periphery of the second sealing tape is coated with epoxy resin sealant.

[0011] Furthermore, the upper threaded steel anti-buoyancy anchor rod is fitted with an anchoring plate located above the second isolation pipe, and the upper threaded steel anti-buoyancy anchor rod is threadedly connected with an anchoring nut, which is located above the anchoring plate.

[0012] Furthermore, the upper end of the first large-diameter pipe is provided with an outwardly expanding support tray, the support tray is provided with upwardly extending and circumferentially arranged limiting posts, the support tray supports a spiral rib, and the lower end of the spiral rib is sleeved on the outer periphery of all the limiting posts.

[0013] Furthermore, the tray is provided with clearance holes arranged in a circumferential pattern.

[0014] The present invention has the following beneficial effects: Using a threaded sleeve as the core force-transmitting connector, its central threaded hole engages with the upper ends of the lower and upper threaded steel anti-buoyancy anchor rods, respectively, achieving axial connection and load transfer between the two anchor rod sections. A sleeve is fitted around the outer periphery of the threaded sleeve, forming an outer protective space for the connection. A first adapter pipe completes the transition connection between the lower end of the sleeve and the lower threaded steel anti-buoyancy anchor rod, and a second adapter pipe completes the transition connection between the upper end of the sleeve and the upper threaded steel anti-buoyancy anchor rod. Together, these three components form an isolation and protective cavity, enclosing the threaded connection node and preventing the intrusion of external concrete slurry and moisture. Through the mechanical threaded connection of the threaded sleeve, the total length of the anchor rod can be quickly extended, supplementing the anchorage length and solving the problem of insufficient top anchorage length due to bottom rock embedding requirements, ensuring that the anchor rod meets the requirements during tensioning. The fully enclosed isolation structure, consisting of the sleeve, the first transfer pipe, and the second transfer pipe, can effectively prevent cement slurry from seeping into the connection part during the pouring of the base slab, ensuring that the anchor rod and the base slab concrete remain unbonded, thus providing a structural foundation for subsequent prestressing tensioning operations.

[0015] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a cross-sectional view of the first embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of the first embodiment of the present invention; Figure 3 This is a schematic diagram of the exploded state of a portion of the structure of the first embodiment of the present invention; Figure 4 This is a structural schematic diagram of one embodiment of spiral reinforcement installation; Figure 5 This is a schematic diagram of another embodiment of the present invention; Figure 6 This is a schematic diagram of the exploded structure of the first transfer pipe and the spiral reinforcement.

[0017] Legend: 100 threaded steel anti-buoyancy anchor rod, 110 first isolation pipe, 111 first sealing structure; Threaded sleeve 200, threaded hole 210; Upper threaded steel anti-buoyancy anchor rod 300, second isolation pipe 310, second sealing tape 311; 400mm sleeve; First adapter pipe 500, first large diameter pipe 510, bearing tray 511, limiting post 512, clearance through hole 513, first tapered pipe 520, first sealing filling groove 521, first small diameter pipe 530; Second adapter pipe 600, second large diameter pipe 610, second tapered pipe 620, second sealing filling groove 621, second small diameter pipe 630; Anchoring plate 700, anchoring nut 710; Spiral reinforcement 800; Horizontal reinforcing bars 900, binding straps 910. Detailed Implementation

[0018] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0021] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0022] Please refer to Figure 1 and Figure 2 The present invention provides a preferred embodiment of a threaded steel anti-buoyancy anchor rod extension connection device, which includes a lower threaded steel anti-buoyancy anchor rod 100, a threaded sleeve 200, an upper threaded steel anti-buoyancy anchor rod 300, a sleeve 400, a first adapter pipe 500, and a second adapter pipe 600.

[0023] The threaded sleeve 200 has a threaded hole 210 at its center, and the threaded sleeve 200 is threadedly fitted onto the upper end of the lower threaded steel anti-buoyancy anchor rod 100.

[0024] The lower end of the upper threaded steel anti-buoyancy anchor rod 300 is threadedly connected to the threaded hole 210. Both the upper threaded steel anti-buoyancy anchor rod 300 and the lower threaded steel anti-buoyancy anchor rod 100 are threadedly connected in the threaded hole 210 to achieve docking and force transmission.

[0025] The sleeve 400 is fitted around the outer circumference of the threaded sleeve 200. The upper end of the first adapter pipe 500 is fitted around the outer circumference of the lower end of the sleeve 400, and the lower end of the first adapter pipe 500 is fitted around the outer circumference of the lower threaded steel anti-buoyancy anchor rod 100.

[0026] The lower end of the second adapter pipe 600 is fitted onto the outer periphery of the upper end of the sleeve 400, and the upper end of the second adapter pipe 600 is fitted onto the outer periphery of the upper threaded steel anti-buoyancy anchor rod 300.

[0027] This invention provides an extended connection device for threaded steel anti-buoyancy anchor rods, using a threaded sleeve 200 as the core force-transmitting connector. Through its central threaded hole 210, it forms threaded engagement with the upper end of the lower threaded steel anti-buoyancy anchor rod 100 and the lower end of the upper threaded steel anti-buoyancy anchor rod 300, achieving axial connection and load transfer between the two anchor rod sections. A sleeve 400 is fitted around the threaded sleeve 200, forming an outer protective space for the connection. A first adapter pipe 500 completes the transition connection between the lower end of the sleeve 400 and the lower threaded steel anti-buoyancy anchor rod 100, and a second adapter pipe 600 completes the transition connection between the upper end of the sleeve 400 and the upper threaded steel anti-buoyancy anchor rod 300. These three components together form an isolation and protective cavity, enclosing the threaded connection node and preventing the intrusion of external concrete slurry and moisture. The mechanical threaded connection of the threaded sleeve 200 allows for rapid extension of the total anchor length, supplementing the anchorage length and resolving the issue of insufficient top anchorage length due to bottom rock embedding requirements, ensuring that the anchorage meets the requirements during tensioning. The encapsulation and isolation structure, composed of the sleeve 400, the first adapter pipe 500, and the second adapter pipe 600, effectively prevents cement slurry from seeping into the connection points during base slab pouring, ensuring that the lower threaded anti-buoyancy anchor 100 and the upper threaded anti-buoyancy anchor 300 remain unbonded to the base slab concrete, providing a structural foundation for subsequent prestressing tensioning operations.

[0028] Reference Figures 1 to 3In some embodiments of the present invention, the first adapter pipe 500 includes a first large-diameter pipe 510, a first tapered pipe 520, and a first small-diameter pipe 530 arranged coaxially from top to bottom. The first large-diameter pipe 510 is sleeved on the outer periphery of the lower end of the sleeve 400, and the first small-diameter pipe 530 is sleeved on the outer periphery of the lower threaded steel anti-buoyancy anchor rod 100. The diameter of the first large-diameter pipe 510 is larger than the diameter of the first small-diameter pipe 530. The first tapered pipe 520 is tapered downwards, with one end connected to the first large-diameter pipe 510 and the other end connected to the first small-diameter pipe 530. A first sealing filling groove 521 is formed between the first tapered pipe 520 and the outer periphery of the lower threaded steel anti-buoyancy anchor rod 100 for filling with grease. The first adapter pipe 500 adopts a three-section coaxial variable diameter structure. The upper first large diameter pipe 510 is sleeved on the outer periphery of the lower end of the sleeve 400 to achieve a tight connection with the sleeve 400. The lower first small diameter pipe 530 is sleeved on the outer periphery of the lower threaded steel anti-buoyancy anchor rod 100 to achieve a smooth connection between the large-size sleeve 400 and the small-diameter lower threaded steel anti-buoyancy anchor rod 100. The middle first tapered pipe 520 is tapered downwards. Its inner wall and the outer periphery of the lower threaded steel anti-buoyancy anchor rod 100 form a first sealing filling groove 521. During construction, grease is filled into the groove. The grease can penetrate downwards and fill the gap between the lower threaded steel anti-buoyancy anchor rod 100 and the outer peripheral structure. This reduces the friction between the lower threaded steel anti-buoyancy anchor rod 100 and the surrounding structure during tensioning, reduces the force of the lower threaded steel anti-buoyancy anchor rod 100 transmitted to the surrounding structure, and reduces the dispersion of tension force. The first sealing filling groove 521 can hold a sufficient amount of anti-corrosion lubricating grease, which can fill the gaps around the outer periphery of the lower threaded steel anti-buoyancy anchor rod 100, block the cement slurry seepage path, enhance the lower sealing effect, and form anti-corrosion lubrication protection for the anchor rod, ensuring that the anchor rod can slide relatively during tensioning and maintain a non-adhesive working state.

[0029] Reference Figures 1 to 3In a further embodiment of the present invention, the second adapter pipe 600 includes a second large-diameter pipe 610, a second tapered pipe 620, and a second small-diameter pipe 630 arranged coaxially from bottom to top. The second large-diameter pipe 610 is sleeved on the outer periphery of the upper end of the sleeve 400, and the second small-diameter pipe 630 is sleeved on the outer periphery of the upper threaded steel anti-buoyancy anchor rod 300. The diameter of the second large-diameter pipe 610 is larger than the diameter of the second small-diameter pipe 630. The second tapered pipe 620 is tapered upwards, with one end connected to the second large-diameter pipe 610 and the other end connected to the second small-diameter pipe 630. A second sealing filling groove 621 is formed between the second tapered pipe 620 and the outer periphery of the upper threaded steel anti-buoyancy anchor rod 300 for filling with grease. The second adapter pipe 600 adopts a three-section variable diameter structure symmetrical to the lower part. The second large-diameter pipe 610 at the lower end is sleeved on the outer circumference of the upper end of the sleeve 400 to achieve docking and fixation with the sleeve 400; the second small-diameter pipe 630 at the upper end is sleeved on the outer circumference of the upper threaded steel anti-buoyancy anchor rod 300 to complete the transition connection between the sleeve 400 and the upper threaded steel anti-buoyancy anchor rod 300; the middle second tapered pipe 620 is tapered upward, and its inner wall and the outer circumference of the upper threaded steel anti-buoyancy anchor rod 300 form a second sealing filling groove 621. The groove is filled with grease to fill the upper annular gap. The grease in the second sealing filling groove 621 can seal the gap between the upper adapter pipe and the rib, and cooperate with the lower sealing structure to achieve double sealing of the upper and lower ends of the connecting cavity, preventing cement slurry from seeping into the sleeve 400 from the upper and lower ends.

[0030] Reference Figures 1 to 3 In a further embodiment of the present invention, the sleeve 400 and the threaded sleeve 200 are clearance-fitted to allow grease to penetrate into the gap between the sleeve 400 and the threaded sleeve 200. This gap is connected to the sealing and filling groove of the upper and lower adapter pipes. When filling with grease, the grease can diffuse through the gap and fill the entire space between the sleeve 400 and the threaded sleeve 200, so that the threaded sleeve 200 is completely immersed in the anti-corrosion grease. This also reduces the friction between the threaded sleeve 200 and the sleeve 400 during tensioning, reducing the adhesion of the outer periphery to other structures during tensioning. In addition, the sleeve 400, the first adapter tube 500 and the second adapter tube 600 are connected as a whole. Since the sleeve 400 and the threaded sleeve 200 are in clearance fit, the first tapered tube 520 and the second tapered tube 620 can be used together to position and limit the sleeve 400, the first adapter tube 500 and the second adapter tube 600 and the threaded sleeve 200, and avoid structural misalignment.

[0031] Reference Figure 1In some embodiments of the present invention, a first isolation pipe 110 is sleeved around the outer periphery of the threaded steel anti-buoyancy anchor rod 100. The first isolation pipe 110 is located below and connected to the first adapter pipe 500. A first sealing structure 111 is provided at the connection point between the first isolation pipe 110 and the first adapter pipe 500. Specifically, the first small-diameter pipe 530 is connected to the first isolation pipe 110, and the first sealing structure 111 is provided at the connection point. After the first isolation pipe 110 is connected to the first adapter pipe 500, the isolation and protection structure of the extended part can be connected to the isolation sleeve of the original anchor rod to form a whole, realizing full-length unbonded protection of the inner section of the anchor rod bottom plate, avoiding protection breaks, and forming a continuous lower isolation and protection system; the first sealing structure 111 can seal the connection gap between the first isolation pipe 110 and the first adapter pipe 500, extend the penetration path of cement grout, improve the overall sealing of the lower protection system, and prevent grout from invading from the connection point and wrapping the reinforcement.

[0032] Reference Figure 1 In some embodiments of the present invention, the first sealing structure 111 includes a first sealing tape wrapped around the joint between the first isolation pipe 110 and the first adapter pipe 500, the outer periphery of which is coated with epoxy resin sealant. At the joint between the first isolation pipe 110 and the first adapter pipe 500, the first sealing tape is first wrapped around to provide a first layer of physical sealing; then, epoxy resin sealant is uniformly coated around the outer periphery of the sealing tape, and after curing, a continuous rigid sealing layer is formed, completely covering and sealing the joint. The two work together to significantly improve the sealing reliability of the first sealing structure 111; the sealing tape has a certain deformation adaptability, which can compensate for dimensional deviations in the pipe joint; the epoxy resin sealant, after curing, has strong adhesion and good impermeability, and can withstand the lateral pressure during concrete pouring, avoiding seal failure.

[0033] Reference Figure 1 In some embodiments of the present invention, a second isolation tube 310 is sleeved around the outer periphery of the upper threaded steel anti-buoyancy anchor rod 300. The second isolation tube 310 is located above and connected to the second adapter tube 600. A second sealing tape 311 is wrapped around the joint between the second isolation tube 310 and the second adapter tube 600, and the outer periphery of the second sealing tape 311 is coated with epoxy resin sealant. The second isolation tube 310 is sleeved around the outer periphery of the upper threaded steel anti-buoyancy anchor rod 300, and the lower end of the second isolation tube 310 is connected to the upper end of the second adapter tube 600 to form a continuous upper isolation protection, ensuring that the entire anchor rod is in an unbonded protective state, which meets the structural requirements of prestressing tensioning. The second sealing tape 311 is first wrapped around the joint to fill the gap, and then epoxy resin sealant is applied to the outer periphery to form a double sealing structure at the upper joint. The double sealing structure, consisting of the second sealing tape 311 and epoxy resin sealant, can effectively seal the joint between the second isolation pipe 310 and the second transfer pipe 600, blocking the path of cement slurry infiltration.

[0034] Reference Figure 4 In some embodiments of the present invention, the upper threaded steel anti-buoyancy anchor rod 300 is fitted with an anchoring plate 700 located above the second isolation pipe 310. The upper threaded steel anti-buoyancy anchor rod 300 is threadedly connected to an anchoring nut 710, which is located above the anchoring plate 700. The anchoring plate 700 is fitted onto the upper threaded steel anti-buoyancy anchor rod 300, with its bottom surface adhering to the top surface of the basement floor slab. The anchoring nut 710 is then screwed onto the upper threaded steel anti-buoyancy anchor rod 300, pressing the anchoring plate 700 tightly. The anchoring plate 700 increases the stress-bearing area at the tensioning end of the anchor rod, distributing the force to the base slab concrete, avoiding localized pressure failure of the concrete, and ensuring the uniformity of prestress transfer and structural safety. Figure 4 As shown, in some embodiments of the present invention, a spiral reinforcement 800 is also provided to enhance the crack resistance and local bearing capacity of the concrete around the anchoring end of the anchor rod. In order for the spiral reinforcement 800 to be placed near the anchoring plate 700, a binding strap 910 is usually used to tie it to the horizontal reinforcement 900 of the steel reinforcement cage. During construction, the bottom slab concrete pouring will wrap the spiral reinforcement 800. After the bottom slab concrete solidifies, tensioning is performed, and then the anchoring nut 710 is tightened, so that the anchoring plate 700 presses the bottom slab concrete. Since the upper threaded steel anti-buoyancy anchor rod 300 and the lower threaded steel anti-buoyancy anchor rod 100 are isolated from the bottom slab concrete by the isolation structure (first isolation pipe, second isolation pipe, sleeve 400, first transfer pipe 500 and second transfer pipe 600), the upward tension of the upper threaded steel anti-buoyancy anchor rod 300 and the lower threaded steel anti-buoyancy anchor rod 100 is directly transmitted to the lower end of the lower threaded steel anti-buoyancy anchor rod 100 during tensioning.

[0035] Reference Figure 5 and Figure 6 In other embodiments of the present invention, the upper end of the first large-diameter pipe 510 is provided with an outwardly expanding support tray 511. The support tray 511 is provided with upwardly extending and circumferentially arranged limiting posts 512. The support tray 511 supports a spiral rib 800, and the lower end of the spiral rib 800 is sleeved on the outer periphery of all the limiting posts 512. By sleeved on the lower end of the spiral rib 800 on the outer periphery of all the limiting posts 512, the vertical weight of the spiral rib 800 is supported by the support tray 511, and the limiting posts 512 form a radial constraint on the spiral rib 800 to prevent it from shifting horizontally. The support plate 511 can provide vertical support and positioning for the spiral reinforcement 800, allowing the installation of the spiral reinforcement 800 to be completed without additional binding and fixing, thus improving construction efficiency. The surrounding limiting posts 512 can form radial constraints on the spiral reinforcement 800, ensuring the coaxiality of the spiral reinforcement 800 and the anchor rod body, preventing the spiral reinforcement 800 from shifting during concrete pouring, and ensuring its constraint and reinforcement effect on the concrete around the anchor rod. The spiral reinforcement 800 can enhance the crack resistance and local bearing capacity of the surrounding concrete, preventing splitting failure of the concrete during tensioning.

[0036] Reference Figure 5 and Figure 6 In a further embodiment of the present invention, the support tray 511 is provided with bypass through holes 513 arranged in a circumferential pattern. The bypass through holes 513 can ensure the flow of grout during concrete pouring, avoid the formation of cavities under the support tray 511 and the problem of insufficient compaction of concrete. When pouring the base slab concrete, the concrete grout can smoothly pass through the support tray 511 through the bypass through holes 513, filling the space on the upper and lower sides of the support tray, so that the upper and lower concrete form a continuous whole, ensuring the pouring quality of the concrete around the node and the integrity of the structure. Without weakening the overall load-bearing capacity of the support tray 511, the opening of through holes can reduce the self-weight of the component and save raw materials.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A threaded steel anti-buoyancy anchor rod extension connection device, characterized in that, include: Lower threaded steel anti-buoyancy anchor rod (100); A threaded sleeve (200) has a threaded hole (210) in the center and is threadedly connected to the upper end of the lower threaded steel anti-buoyancy anchor rod (100); The upper threaded steel anti-buoyancy anchor rod (300) has a threaded connection at the lower end to the threaded hole (210). A sleeve (400) is fitted around the outer periphery of a threaded sleeve (200); The first adapter pipe (500) is fitted at the upper end on the outer periphery of the lower end of the sleeve (400) and at the lower end on the outer periphery of the lower threaded steel anti-buoyancy anchor rod (100); The second adapter pipe (600) is fitted at its lower end on the outer periphery of the upper end of the sleeve (400) and at its upper end on the outer periphery of the upper threaded steel anti-buoyancy anchor rod (300).

2. The threaded steel anti-buoyancy anchor rod extension connection device according to claim 1, characterized in that, The first adapter pipe (500) includes a first large-diameter pipe (510), a first tapered pipe (520) and a first small-diameter pipe (530) arranged coaxially from top to bottom. The first large-diameter pipe (510) is sleeved on the outer periphery of the lower end of the sleeve (400), and the first small-diameter pipe (530) is sleeved on the outer periphery of the lower threaded steel anti-buoyancy anchor rod (100). The diameter of the first large-diameter pipe (510) is larger than the diameter of the first small-diameter pipe (530). The first tapered pipe (520) is arranged to be tapered downwards. One end of the first tapered pipe (520) is connected to the first large-diameter pipe (510), and the other end is connected to the first small-diameter pipe (530). A first sealing filling groove (521) is formed between the first tapered pipe (520) and the outer periphery of the lower threaded steel anti-buoyancy anchor rod (100) for filling with grease.

3. The threaded steel anti-buoyancy anchor rod extension connection device according to claim 2, characterized in that, The second adapter pipe (600) includes a second large-diameter pipe (610), a second tapered pipe (620), and a second small-diameter pipe (630) arranged coaxially from bottom to top. The second large-diameter pipe (610) is sleeved on the outer periphery of the upper end of the sleeve (400), and the second small-diameter pipe (630) is sleeved on the outer periphery of the upper threaded steel anti-buoyancy anchor rod (300). The diameter of the second large-diameter pipe (610) is larger than the diameter of the second small-diameter pipe (630). The second tapered pipe (620) is arranged to be tapered upwards. One end of the second tapered pipe (620) is connected to the second large-diameter pipe (610), and the other end is connected to the second small-diameter pipe (630). A second sealing filling groove (621) is formed between the second tapered pipe (620) and the outer periphery of the upper threaded steel anti-buoyancy anchor rod (300) for filling with grease.

4. The threaded steel anti-buoyancy anchor rod extension connection device according to claim 3, characterized in that, The sleeve (400) and the threaded sleeve (200) are clearance fit so that grease can penetrate into the gap between the sleeve (400) and the threaded sleeve (200).

5. The threaded steel anti-buoyancy anchor rod extension connection device according to claim 1, characterized in that, The lower threaded steel anti-buoyancy anchor rod (100) is fitted with a first isolation pipe (110) on its outer periphery. The first isolation pipe (110) is located below the first adapter pipe (500) and is connected to the first adapter pipe (500). A first sealing structure (111) is provided at the connection between the first isolation pipe (110) and the first adapter pipe (500).

6. The threaded steel anti-buoyancy anchor rod extension connection device according to claim 5, characterized in that, The first sealing structure (111) includes a first sealing tape wrapped around the joint between the first isolation tube (110) and the first adapter tube (500), the outer periphery of which is coated with epoxy resin sealant.

7. The threaded steel anti-buoyancy anchor rod extension connection device according to claim 1, characterized in that, The upper threaded steel anti-buoyancy anchor rod (300) is fitted with a second isolation tube (310) on its outer periphery. The second isolation tube (310) is located above the second adapter pipe (600) and is connected to the second adapter pipe (600). A second sealing tape (311) is wrapped around the connection between the second isolation tube (310) and the second adapter pipe (600). The outer periphery of the second sealing tape (311) is coated with epoxy resin sealant.

8. The threaded steel anti-buoyancy anchor rod extension connection device according to claim 7, characterized in that, The upper threaded steel anti-buoyancy anchor rod (300) is fitted with an anchoring pad (700) located above the second isolation pipe (310), and the upper threaded steel anti-buoyancy anchor rod (300) is threadedly connected with an anchoring nut (710), which is located above the anchoring pad (700).

9. The threaded steel anti-buoyancy anchor rod extension connection device according to claim 2, characterized in that, The upper end of the first large-diameter pipe (510) is provided with a horizontally expanding support tray (511), the support tray (511) is provided with upwardly extending and surrounding limit posts (512), the support tray (511) supports a spiral rib (800), and the lower end of the spiral rib (800) is sleeved on the outer periphery of all the limit posts (512).

10. The threaded steel anti-buoyancy anchor rod extension connection device according to claim 9, characterized in that, The tray (511) is provided with clearance holes (513) arranged in a circumferential pattern.

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