Tension-compression composite type anchoring joint for connecting anti-floating pipe pile with bottom plate and construction method of tension-compression composite type anchoring joint

Abstract

The invention relates to the technical field of anti-floating of underground engineering, in particular to a tension-compression composite anchoring node for connecting an anti-floating pipe pile with a bottom plate. The structure comprises a sealing cap and a finish-rolled twisted steel bar, the lower part of the finish-rolled twisted steel is inserted into a pile cavity of the tubular pile, the upper part of the finish-rolled twisted steel is anchored into the bottom plate, and the pile cavity of the tubular pile is filled with a grouting body; the bottom, inserted into the pipe pile, of the finish-rolled twisted steel is connected with a sealing cap, the sealing cap comprises valve hinges and an end barrel, an adjusting seam is formed between the valve hinges, and a screw joint groove and a reinforcing rib are arranged in the end barrel. A self-adaptive sealing structure is formed through the valve hinge of the sealing cap and the adjusting seam, the self-adaptive sealing structure can be tightly attached to the pile wall after being inserted into the pipe pile, the problem of grout leakage of a grouting body in a traditional process is solved, the compactness of the grouting body is guaranteed, and therefore the tension-compression composite bearing capacity of an anchoring joint is improved, and the anti-floating reliability is enhanced; the connecting structure is suitable for connecting the anti-floating pipe pile and the bottom plate in underground engineering.

Description

Technical Field

[0001] This invention relates to the field of underground anti-buoyancy engineering technology, and in particular to a tension-compression composite anchoring joint for connecting anti-buoyancy pipe piles to the base plate and its construction method. Background Technology

[0002] Underground engineering structures are subject to upward buoyancy from groundwater, causing an upward force on the foundation slab. Therefore, the foundation slab of underground engineering projects must be protected against cracking, uplift of the underground structure, and damage to basement columns under the influence of groundwater. To ensure the safety of underground engineering structures under the influence of groundwater, anti-buoyancy pipe piles are often used. This involves mechanically driving precast hollow pipe piles into the foundation soil beneath the foundation slab, then constructing reinforced concrete cages within the pile cavities. The exposed reinforced concrete cages are then anchored into the foundation slab to connect the pipe piles and the foundation slab.

[0003] The reinforced cage method for connecting anti-buoyancy pipe piles to the base slab is a relatively traditional construction technique. However, numerous connection failure cases indicate that the reinforced cage method has the following problems: (1) The bottom of the reinforcing cage is welded with an end plate. Since the pipe pile is produced by centrifugal method, the pile cavity of the pipe pile cannot be formed into an ideal circle. In order to ensure that the end plate is installed smoothly in the pile cavity of the pipe pile, the diameter of the end plate is generally smaller than the inner diameter of the pipe pile. After the reinforcing cage is inserted into the pipe pile, a portion of dry sand is often used to fill the end plate to seal the gap between the end plate and the pipe pile before pouring concrete. During the final setting of the concrete, the slurry inside the concrete will gradually dilute the sand on the end plate, eventually causing the sand and cement slurry inside the concrete to flow out from the gap between the end plate and the pipe pile. This causes the concrete to rot due to insufficient cement slurry, making it difficult to ensure the bond between the concrete and the pipe pile, which can easily induce the floating accident of the underground structure.

[0004] (2) The steel cage is generally made of 6-8 longitudinal steel bars and spiral bars. Due to the small inner diameter of the anti-buoyancy pipe pile, it is difficult to use a vibrator to vibrate the concrete when the concrete is poured after the steel cage is inserted. This results in the concrete in the pile cavity of the pipe pile connection section not being dense enough, which greatly reduces the bond strength between the concrete and the pipe pile interface, resulting in insufficient pull-out resistance of the connection node of the steel cage method.

[0005] (3) The steel cage method requires on-site cutting of longitudinal steel bars, fabrication of spiral bars, and welding of end plates. The processing and fabrication work is extensive and labor-intensive. Furthermore, the subsequent pouring of concrete inside the pipe piles requires long-term hoisting operations, resulting in low overall construction efficiency.

[0006] (4) The steel bars of the steel cage that are exposed to the pipe pile and anchored into the bottom slab are at the bottom interface of the bottom slab. It is difficult to take effective waterproof measures. If the bottom waterproof construction is not completely sealed and isolated, the groundwater at the bottom interface of the bottom slab is prone to corroding the steel bars, which will lead to insufficient tensile strength of the steel cage and may cause the bottom slab to bulge or even float.

[0007] Therefore, how to solve the construction method of connecting anti-buoyancy pipe piles and base slabs in a more efficient, convenient and economical way using the traditional steel cage method has long been a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0008] To address the shortcomings of the prior art, the present invention provides a tension-compression composite anchoring node for connecting a bottom plate to an anti-buoyancy pipe pile, comprising a sealing cap and a finely rolled threaded steel bar; The lower part of the finely rolled threaded steel bar is inserted into the pile cavity of the pipe pile, and the upper part is anchored into the bottom plate; the pile cavity of the pipe pile is filled with grout. The bottom of the finely rolled threaded steel bar inserted into the pipe pile is connected to the sealing cap. The sealing cap includes a flap and an end cylinder. An adjustment slot is provided between the flaps. The end cylinder is provided with a threaded groove and a reinforcing rib.

[0009] Furthermore, it also includes a support body; the support body includes at least one upper support body and / or at least one lower support body; The lower bearing body is sleeved on the rod section of the fine-rolled threaded steel bar inserted into the pipe pile. The lower bearing body has a through hole at its center, and the through hole has threads that match the fine-rolled threaded steel bar. The upper bearing body is sleeved on the rod section of the fine-rolled threaded steel bar anchored into the bottom plate. The upper bearing body has a through hole at its center, and the through hole has threads that match the fine-rolled threaded steel bar.

[0010] Furthermore, it also includes a sleeve; the sleeve is fitted onto the finely rolled threaded steel bar above the lower bearing body.

[0011] Furthermore, the sleeve is fitted onto the finely rolled threaded steel bar between the upper and lower bearing bodies, with the lower end of the sleeve abutting against the lower bearing body and the upper end of the sleeve abutting against the top of the upper bearing body or the pipe pile.

[0012] Furthermore, the adjusting slit of the sealing cap is inclined in a clockwise direction, and the width of the adjusting slit gradually decreases to zero from top to bottom.

[0013] Furthermore, the end cylinder of the sealing cap is provided with a threaded cavity, and the threaded cavity is provided with threads that match the finely rolled threaded steel bar.

[0014] Furthermore, the outer diameter of the flap of the sealing cap is larger than the inner diameter of the pipe pile.

[0015] Furthermore, the support body includes a support plate and a reinforcing nut, the support plate and the reinforcing nut having a through hole, the upper end of the fine-rolled threaded steel bar passing through the through hole and threadedly connected to the reinforcing nut.

[0016] The present invention also provides a construction method for a tension-compression composite anchoring joint for an anti-buoyancy pipe pile connecting to a base plate as described above, comprising the following steps: (1) A sealing cap is installed at the bottom end of the fine-rolled threaded steel bar. The sealing cap includes a flap and an end tube. An adjustment gap is provided between the flaps. The end tube is provided with a threaded groove and a reinforcing rib. (2) Insert the lower part of the fine-rolled threaded steel bar equipped with the sealing cap into the pile cavity of the pipe pile. After the flaps of the sealing cap are tightly closed, continue to insert to the design depth. (3) Inject grout into the pile cavity from the hole of the pipe pile; (4) Anchor the upper part of the finely rolled threaded steel bar into the completed base plate.

[0017] Based on the above, compared with the prior art, the tension-compression composite anchoring node for connecting the anti-floating pipe pile to the base plate provided by the present invention has the following advantages: (1) Significantly improved construction quality. In the existing rebar cage method, because the welded end plates at the bottom of the rebar cage must be smoothly inserted into the pile cavity without being blocked by the non-circular shape of the pile cavity, the diameter of the end plates must be smaller than the inner diameter of the pile. Although the gap between the end plates and the inner wall of the pile is treated, it is difficult to fully guarantee construction quality during large-scale on-site construction, resulting in inevitable loss of cement slurry from the concrete inside the pile, affecting concrete quality. Furthermore, after the rebar cage is inserted into the pile, it is difficult to fully vibrate the concrete (vibration accelerates slurry leakage, exacerbating concrete quality problems), making it difficult for the concrete to be fully compacted, further affecting the bond strength between the concrete and the pile interface. In contrast, this invention installs a sealing cap at the bottom of the finely rolled threaded rebar, with an adjustment joint on the upper part of the sealing cap. When the sealing cap is inserted into the pile cavity, the adjustment joint is compressed, and the valve leaves are tightly squeezed together to form a sealed structure. When concrete, mortar, cement paste, or other grouts are poured on top of the sealing cap, no leakage occurs from the sealing cap, thus significantly improving the quality of the grout or concrete. When using mortar or cement grout, vibration is not required, which can fully guarantee the construction quality of the grout pipe.

[0018] (2) Significantly improved construction efficiency. In this invention, the reinforcing bars connecting the pipe piles and the base slab use precision-rolled threaded steel bars as a substitute for the steel cage. These precision-rolled threaded steel bars can be prefabricated to the designed length at the steel plant and directly transported to the construction site, eliminating the need for on-site cutting and achieving zero waste. Furthermore, the precision-rolled threaded steel bars, sealing caps, and load-bearing bodies are assembled using a modular construction process, eliminating the cumbersome procedures of main bar positioning, steel cage assembly, and binding in the steel cage method, thus significantly improving construction speed. The steel cage method requires long-term hoisting operations for concrete pouring, and because the steel cage is inserted into the pile cavity, the pouring channel is extremely limited, resulting in very low construction efficiency. However, with the sealing cap in this invention, since there is only one steel bar, concrete pouring is very convenient. Moreover, when using mortar or cement paste, it can be directly pumped using a grouting pump, further improving efficiency.

[0019] In the preferred embodiment, the structural stress distribution of the present invention is more rational. When the base slab is subjected to the buoyancy of groundwater, causing stress on the reinforcing cage, the shear stress at the interface between the reinforcing cage and the base slab concrete, and at the interface between the concrete and the pipe pile, is transmitted downwards from the borehole opening, resulting in significant stress concentration at the opening and an unreasonable stress distribution. The present invention employs a tension-compression composite anchoring node, with a sleeve installed between the upper and lower load-bearing bodies. This section of finely threaded steel reinforcement has no bonding with the concrete or mortar, allowing the shear stress at the interface between the concrete or mortar and the pipe pile to be transmitted upwards and downwards simultaneously at the load-bearing body. This significantly reduces the peak value of the interface shear stress and substantially improves the load-bearing performance.

[0020] In a preferred embodiment, a sleeve is provided between the base plate of the fine-rolled threaded steel bar and the bearing plate inside the pipe pile, which significantly improves the waterproof and corrosion-resistant performance of the fine-rolled threaded steel bar at the bottom interface of the base plate. Installing a water-stop ring at the pipe pile opening can further greatly improve the waterproof performance. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional view of a tension-compression composite anchoring node for an anti-buoyancy pipe pile connection base plate provided in an embodiment of the present invention; Figure 2 For the present invention Figure 1 AA cross-section view; Figure 3 For the present invention Figure 1 BB cross-section; Figure 4 For the present invention Figure 1CC cross-section; Figure 5 For the present invention Figure 1 DD cross-section; Figure 6 For the present invention Figure 1 EE cross-section; Figure 7 This is a cross-sectional view of the carrier of the present invention; Figure 8 For the present invention Figure 7 FF cross-sectional view; Figure 9 This is a front view of the sealing cap of the present invention; Figure 10 This is a cross-sectional view of the sealing cap of the present invention; Figure 11 For the present invention Figure 9 GG cross-section; Figure 12 For the present invention Figure 9 HH cross-section diagram; Figure 13 For the present invention Figure 9 Section II; Figure 14 This is a cross-sectional view of the sealing cap of the present invention being lowered to the opening of the pipe pile without shrinkage or deformation; Figure 15 This is a cross-sectional view of the sealing cap of the present invention after it has shrunk and deformed when it is lowered to the bottom of the pipe pile hole; Figure 16 A cross-sectional view of the traditional steel cage connection technology for connecting pipe piles to the base slab; Figure 17 This is a cross-sectional view of the pipe pile and base plate of Embodiment 2 using the sealing cap of the present invention; Figure 18 This is a cross-sectional view of the pipe pile and base plate of Embodiment 3 using the sealing cap of the present invention; Figure 19 This is a cross-sectional view of the pipe pile and base plate of Embodiment 4 using the sealing cap of the present invention; Figure 20 This is a cross-sectional view of the pipe pile and base plate of Embodiment 5 using the sealing cap of the present invention; Figure 21 This is a cross-sectional view of the pipe pile and base plate of Embodiment Six using the sealing cap of the present invention; Figure 22 This is a cross-sectional view of the pipe pile and base plate of Embodiment Seven using the sealing cap of the present invention.

[0023] Figure label: 100. Sealing cap; 101. Visible flap; 102. Adjustment joint; 103. End sleeve; 104. Threaded groove; 105. Threaded cavity; 106. Reinforcing rib; 200. Bearing body; 201. Bearing plate; 202. Reinforcing nut; 203. Through hole; 204. Upper bearing body; 205. Lower bearing body; 210. Fine-rolled threaded steel bar; 211. Sleeve; 300. Pipe pile; 301. Pile cavity; 302. Pile wall; 303. Grouting body; 310. Ribbed steel bar; 311. Spiral reinforcement; 312. End plate; 400. Base plate; 401. Waterproof protective layer; 402. Waterproof layer; 403. Subbase layer. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] like Figure 16 As shown, in the existing technology, the steel cage is generally made of 6-8 longitudinal ribbed steel bars 310 and spiral bars 311 tied together. The bottom of the steel cage is welded with an end plate 312. However, this method has the problems of poor sealing performance of the end plate, easy leakage of grout when the pile cavity is filled with grout, resulting in poor bonding between the steel bars and the pipe pile and insufficient anchorage bearing capacity; and the longitudinal steel bars are directly anchored into the bottom plate without stress dispersion structure, which makes the bottom plate prone to cracks due to stress concentration, resulting in low anti-buoyancy reliability.

[0027] To address the problems existing in the prior art, the present invention provides the following... Figure 1-15 Example 1 shown Figure 17 Example 2 shown Figure 18 Example 3 shown Figure 19 Example 4 shown Figure 20 Example 5 shown Figure 21 Example 6 shown Figure 22The technical solution of Embodiment 7 shown.

[0028] Example 1 like Figure 1-15 As shown, this embodiment provides a tension-compression composite anchoring joint for connecting anti-buoyancy pipe piles to the base plate, such as... Figure 1-6 As shown, the structure includes a sealing cap 100, a fine-rolled threaded steel bar 210, an upper bearing body 204, a lower bearing body 205, and a sleeve 211. The lower part of the fine-rolled threaded steel bar 210 is inserted into the pile cavity 301 of the pipe pile 300, and the upper part is anchored into the base plate 400. The pile cavity 301 of the pipe pile 300 is filled with grout 303.

[0029] like Figure 9-13 As shown, the bottom end of the fine-rolled threaded steel bar 210 inserted into the pipe pile 300 is connected to a sealing cap 100. The sealing cap 100 includes a flap 101 and an end cylinder 103. An adjustment joint 102 is provided between the flaps 101. The end cylinder 103 is provided with a threaded groove 104 and a reinforcing rib 106.

[0030] like Figure 11 As shown, the adjusting slit 102 of the sealing cap 100 is inclined in a clockwise direction, and the slit width gradually decreases to zero from top to bottom.

[0031] like Figure 10 As shown, the end cylinder 103 is provided with a threaded cavity 105, and the threaded cavity 105 is provided with threads that match the finely rolled threaded steel bar 210. The outer diameter of the flap 101 is larger than the inner diameter of the pipe pile 300.

[0032] like Figure 1 As shown, the bearing body 200 includes an upper bearing body 204 and a lower bearing body 205. The upper bearing body 204 is sleeved on the rod section where the finely rolled threaded steel bar 210 is anchored into the base plate 400, and the lower bearing body 205 is sleeved on the middle part of the rod section where the finely rolled threaded steel bar 210 is inserted into the pipe pile 300. Both the upper bearing body 204 and the lower bearing body 205 have a through hole 203 at their center, and the through hole 203 has threads that match the finely rolled threaded steel bar 210.

[0033] like Figure 7-8 As shown, the support body 200 includes a support plate 201 and a reinforcing nut 202. The support plate 201 and the reinforcing nut 202 are provided with a through hole for the reinforcing bar. The upper end of the fine-rolled threaded steel bar 210 passes through the through hole and is threadedly connected to the reinforcing nut 202.

[0034] like Figure 1 As shown, the sleeve 211 is sleeved on the finely rolled threaded steel bar 210 between the upper bearing body 204 and the lower bearing body 205, and the two ends of the sleeve 211 abut against the upper bearing body 204 and the lower bearing body 205 respectively.

[0035] like Figure 14-15As shown in Example 1, the construction method of the tension-compression composite anchoring joint for the anti-buoyancy pipe pile connecting to the base plate includes the following steps: (1) Install a sealing cap 100 at the bottom end of the fine-rolled threaded steel bar 210 and connect it to the fine-rolled threaded steel bar 210 through the thread in the threaded cavity 105; (2) Install the lower bearing body 205 on the fine-rolled threaded steel bar 210, located in the rod section of the inserted pipe pile 300, and fix it through the thread in the through hole 203; (3) Install sleeve 211 on the fine-rolled threaded steel bar 210, so that the lower end of sleeve 211 abuts against the lower bearing body 205; (4) Install the bearing body 204 on the fine-rolled threaded steel bar 210, located in the bar section anchored into the bottom plate 400, and fix it through the thread in the through hole 203, and make the upper end of the sleeve 211 abut against the bearing body 204. (5) such as Figure 15 As shown, the lower part of the fine-rolled threaded steel bar 210, which is equipped with a sealing cap 100, a lower bearing body 205, a sleeve 211 and an upper bearing body 204, is inserted into the pile cavity 301 of the pipe pile 300. After the flaps 101 of the sealing cap 100 are tightly closed, it is continued to be inserted to the design depth. (6) Inject grout 303 into the pile cavity 301 from the hole of the pipe pile 300 until the grout 303 fills the hole; (7) Construct the base plate 400, anchor the upper part of the fine-rolled threaded steel bar 210 into the base plate 400, and anchor it through the bearing plate 201 and the reinforcing nut 202 of the upper bearing body 204.

[0036] Example 2 like Figure 17 As shown, this embodiment provides a tension-compression composite anchoring node for connecting a bottom plate to an anti-buoyancy pipe pile, including a sealing cap 100, a fine-rolled threaded steel bar 210, a lower bearing body 205, and a sleeve 211; The lower part of the fine-rolled threaded steel bar 210 is inserted into the pile cavity 301 of the pipe pile 300, and the upper part is anchored into the base plate 400. The pile cavity 301 of the pipe pile 300 is filled with grout 303. The bottom end of the fine-rolled threaded steel bar 210 inserted into the pipe pile 300 is connected to a sealing cap 100. The sealing cap 100 includes a flap 101 and an end cylinder 103. An adjustment joint 102 is provided between the flaps 101, and a bolt groove 104 and a reinforcing rib 106 are provided inside the end cylinder 103. The adjustment joint 102 of the sealing cap 100 is inclined in a clockwise direction, and the joint width gradually decreases to zero from top to bottom. The outer diameter of the flap 101 is larger than the inner diameter of the pipe pile 300.

[0037] The lower bearing body 205 is sleeved in the middle of the section of the pipe pile 300 where the finely rolled threaded steel bar 210 is inserted. The lower bearing body 205 has a through hole 203 at its center, and the through hole 203 has threads that match the finely rolled threaded steel bar 210. In this embodiment, no upper bearing body is provided.

[0038] The sleeve 211 is sleeved on the finely rolled threaded steel bar 210 above the lower bearing body 205 and is located inside the pile cavity 301 of the pipe pile 300; The construction method of the tension-compression composite anchoring joint for the anti-buoyancy pipe pile connection base plate provided in Example 2 includes the following steps: (1) Install a sealing cap 100 at the bottom end of the fine-rolled threaded steel bar 210 and connect it to the fine-rolled threaded steel bar 210 through the screw groove 104; (2) Install the lower bearing body 205 on the fine-rolled threaded steel bar 210, located in the rod section of the inserted pipe pile 300, and fix it through the thread in the through hole 203; (3) Install sleeve 211 on the fine-rolled threaded steel bar 210, so that the lower end of sleeve 211 abuts against the lower bearing body 205 and the upper end of sleeve 211 abuts against the top of pipe pile 300. (4) Insert the lower part of the fine-rolled threaded steel bar 210, which is equipped with sealing cap 100, lower bearing body 205 and sleeve 211, into the pile cavity 301 of pipe pile 300. After the valve 101 of sealing cap 100 is tightly close together, continue to insert it to the design depth. (5) Inject grout 303 into the pile cavity 301 from the hole of the pipe pile 300 until the grout 303 fills the hole. (6) Construction of the base plate 400 includes first laying the pad layer 403, then laying the waterproof layer 402, then pouring the waterproof protective layer 401, and finally anchoring the upper part of the fine-rolled threaded steel bar 210 into the base plate 400.

[0039] Example 3 like Figure 18 As shown, this embodiment provides a tension-compression composite anchoring node for connecting a bottom plate to an anti-buoyancy pipe pile, including a sealing cap 100 and a finely rolled threaded steel bar 210; The lower part of the fine-rolled threaded steel bar 210 is inserted into the pile cavity 301 of the pipe pile 300, and the upper part is anchored into the base plate 400. The pile cavity 301 of the pipe pile 300 is filled with grout 303. The bottom end of the fine-rolled threaded steel bar 210 inserted into the pipe pile 300 is connected to a sealing cap 100. The sealing cap 100 includes a flap 101 and an end cylinder 103. An adjustment joint 102 is provided between the flaps 101, and a bolt groove 104 and a reinforcing rib 106 are provided inside the end cylinder 103. The adjustment joint 102 of the sealing cap 100 is inclined in a clockwise direction, and the joint width gradually decreases to zero from top to bottom. The outer diameter of the flap 101 is larger than the inner diameter of the pipe pile 300.

[0040] This embodiment does not include an upper support body, a lower support body, or a sleeve.

[0041] The construction method of the tension-compression composite anchoring joint for the anti-buoyancy pipe pile connection base plate provided in Example 3 includes the following steps: (1) Install a sealing cap 100 at the bottom end of the fine-rolled threaded steel bar 210 and connect it to the fine-rolled threaded steel bar 210 through the screw groove 104; (2) Insert the lower part of the fine-rolled threaded steel bar 210 equipped with sealing cap 100 into the pile cavity 301 of pipe pile 300. After the valve 101 of sealing cap 100 is tightly closed, continue to insert to the design depth. (3) Inject grout 303 into the pile cavity 301 from the hole of the pipe pile 300 until the grout 303 fills the hole; (4) Construction of the base plate 400 includes first laying the pad layer 403, then laying the waterproof layer 402, then pouring the waterproof protective layer 401, and finally anchoring the upper part of the fine-rolled threaded steel bar 210 into the base plate 400.

[0042] Example 4 like Figure 19 As shown, this embodiment provides a tension-compression composite anchoring node for connecting a bottom plate to an anti-buoyancy pipe pile, including a sealing cap 100, a fine-rolled threaded steel bar 210, and an upper bearing body 204; The lower part of the fine-rolled threaded steel bar 210 is inserted into the pile cavity 301 of the pipe pile 300, and the upper part is anchored into the base plate 400. The pile cavity 301 of the pipe pile 300 is filled with grout 303. The bottom end of the fine-rolled threaded steel bar 210 inserted into the pipe pile 300 is connected to a sealing cap 100. The sealing cap 100 includes a flap 101 and an end cylinder 103. An adjustment joint 102 is provided between the flaps 101, and a bolt groove 104 and a reinforcing rib 106 are provided inside the end cylinder 103. The adjustment joint 102 of the sealing cap 100 is inclined in a clockwise direction, and the joint width gradually decreases to zero from top to bottom. The outer diameter of the flap 101 is larger than the inner diameter of the pipe pile 300.

[0043] The upper support body 204 is sleeved on the rod section of the fine-rolled threaded steel bar 210 anchored into the base plate 400. The upper support body 204 has a through hole 203 at its center, and the through hole 203 has threads that match those of the fine-rolled threaded steel bar 210. The upper support body 204 includes a support plate 201 and a reinforcing nut 202. The support plate 201 and the reinforcing nut 202 have a communicating through hole, and the upper end of the fine-rolled threaded steel bar 210 passes through the through hole and is threadedly connected to the reinforcing nut 202.

[0044] This embodiment does not include a lower support body and a sleeve.

[0045] The construction method of the tension-compression composite anchoring joint for the anti-buoyancy pipe pile connection base plate provided in Example 4 includes the following steps: (1) Install a sealing cap 100 at the bottom end of the fine-rolled threaded steel bar 210 and connect it to the fine-rolled threaded steel bar 210 through the screw groove 104; (2) Install the bearing body 204 on the fine-rolled threaded steel bar 210, located in the bar section anchored into the bottom plate 400, and fix it through the thread in the through hole 203; (3) Insert the lower part of the fine-rolled threaded steel bar 210 equipped with sealing cap 100 and upper bearing body 204 into the pile cavity 301 of pipe pile 300. After the valve 101 of sealing cap 100 is tightly closed, continue to insert to the design depth. (4) Inject grout 303 into the pile cavity 301 from the hole of the pipe pile 300 until the grout 303 fills the hole; (5) Construction of the base plate 400 includes first laying the pad layer 403, then laying the waterproof layer 402, then pouring the waterproof protective layer 401, and finally anchoring the upper part of the fine-rolled threaded steel bar 210 into the base plate 400 and anchoring it through the bearing plate 201 and reinforcing nut 202 of the upper bearing body 204.

[0046] Example 5 like Figure 20 As shown, this embodiment provides a tension-compression composite anchoring node for connecting a bottom plate to an anti-buoyancy pipe pile, including a sealing cap 100, a fine-rolled threaded steel bar 210, a lower bearing body 205, and a sleeve 211; The lower part of the fine-rolled threaded steel bar 210 is inserted into the pile cavity 301 of the pipe pile 300, and the upper part is anchored into the base plate 400. The pile cavity 301 of the pipe pile 300 is filled with grout 303. The bottom end of the fine-rolled threaded steel bar 210 inserted into the pipe pile 300 is connected to a sealing cap 100. The sealing cap 100 includes a flap 101 and an end cylinder 103. An adjustment joint 102 is provided between the flaps 101, and a bolt groove 104 and a reinforcing rib 106 are provided inside the end cylinder 103. The adjustment joint 102 of the sealing cap 100 is inclined in a clockwise direction, and the joint width gradually decreases to zero from top to bottom. The outer diameter of the flap 101 is larger than the inner diameter of the pipe pile 300.

[0047] The lower support body 205 is sleeved below the section of the pipe pile 300 where the finely rolled threaded steel bar 210 is inserted, near the sealing cap 100. The center of the lower support body 205 is provided with a through hole 203, and the through hole 203 is provided with threads that match the finely rolled threaded steel bar 210. In this embodiment, no upper support body is provided.

[0048] The sleeve 211 is fitted onto the finely rolled threaded steel bar 210 above the lower bearing body 205 and is located inside the pile cavity 301 of the pipe pile 300.

[0049] The construction method of the tension-compression composite anchoring joint for the anti-buoyancy pipe pile connection base plate provided in Example 5 includes the following steps: (1) Install the lower bearing body 205 on the fine-rolled threaded steel bar 210, located at the lower end of the rod section of the inserted pipe pile 300, and fix it through the thread in the through hole 203; (2) Install a sealing cap 100 at the bottom end of the fine-rolled threaded steel bar 210 and connect it to the fine-rolled threaded steel bar 210 through the screw groove 104; (3) Install sleeve 211 on the fine-rolled threaded steel bar 210, so that the lower end of sleeve 211 abuts against the lower bearing body 205 and the upper end of sleeve 211 abuts against the top of pipe pile 300. (4) Insert the lower part of the fine-rolled threaded steel bar 210, which is equipped with sealing cap 100, lower bearing body 205 and sleeve 211, into the pile cavity 301 of pipe pile 300. After the valve 101 of sealing cap 100 is tightly close together, continue to insert it to the design depth. (5) Inject grout 303 into the pile cavity 301 from the hole of the pipe pile 300 until the grout 303 fills the hole. (6) Construction of the base plate 400 includes first laying the pad layer 403, then laying the waterproof layer 402, then pouring the waterproof protective layer 401, and finally anchoring the upper part of the fine-rolled threaded steel bar 210 into the base plate 400.

[0050] Example 6 like Figure 21 As shown, this embodiment provides a tension-compression composite anchoring node for connecting a bottom plate to an anti-buoyancy pipe pile, including a sealing cap 100, a fine-rolled threaded steel bar 210, an upper bearing body 204, a lower bearing body 205, and a sleeve 211; The lower part of the fine-rolled threaded steel bar 210 is inserted into the pile cavity 301 of the pipe pile 300, and the upper part is anchored into the base plate 400. The pile cavity 301 of the pipe pile 300 is filled with grout 303. The bottom end of the fine-rolled threaded steel bar 210 inserted into the pipe pile 300 is connected to a sealing cap 100. The sealing cap 100 includes a flap 101 and an end tube 103. An adjustment joint 102 is provided between the flaps 101. The end tube 103 is provided with a threaded groove 104 and a reinforcing rib 106. The adjustment joint 102 of the sealing cap 100 is inclined in a clockwise direction, and the joint width gradually decreases to zero from top to bottom. A threaded cavity 105 is provided in the end tube 103, and the threaded cavity 105 is provided with threads that match the fine-rolled threaded steel bar 210. The outer diameter of the flap 101 is larger than the inner diameter of the pipe pile 300.

[0051] The upper bearing body 204 is fitted onto the section of the rod in which the finely threaded steel bar 210 is anchored into the base plate 400. The lower bearing body 205 is fitted onto the section of the rod in which the finely threaded steel bar 210 is inserted into the pipe pile 300, and is positioned close to the sealing cap 100. Both the upper bearing body 204 and the lower bearing body 205 have a through hole 203 at their center, and the through hole 203 has threads that match those of the finely threaded steel bar 210. The upper bearing body 204 includes a bearing plate 201 and a reinforcing nut 202. The bearing plate 201 and the reinforcing nut 202 have a communicating through hole, through which the upper end of the finely threaded steel bar 210 passes and is threadedly connected to the reinforcing nut 202.

[0052] The sleeve 211 is installed on the finely rolled threaded steel bar 210. The lower end of the sleeve 211 abuts against the lower bearing body 205, and the upper end of the sleeve 211 abuts against the top of the pipe pile 300.

[0053] The construction method of the tension-compression composite anchoring joint for the anti-buoyancy pipe pile connection base plate provided in Example 6 includes the following steps: (1) Install the lower bearing body 205 on the fine-rolled threaded steel bar 210, located at the lower end of the rod section of the inserted pipe pile 300, and fix it through the thread in the through hole 203; (2) Install a sealing cap 100 at the bottom end of the fine-rolled threaded steel bar 210 and connect it to the fine-rolled threaded steel bar 210 through the thread in the threaded cavity 105; (3) Install sleeve 211 on the fine-rolled threaded steel bar 210, so that the lower end of sleeve 211 abuts against the lower bearing body 205 and the upper end of sleeve 211 abuts against the top of pipe pile 300. (4) Install the bearing body 204 on the fine-rolled threaded steel bar 210, located in the bar section anchored into the bottom plate 400, and fix it through the thread in the through hole 203, and make the upper end of the sleeve 211 abut against the bearing body 204. (5) Insert the lower part of the fine-rolled threaded steel bar 210, which is equipped with sealing cap 100, lower bearing body 205, sleeve 211 and upper bearing body 204, into the pile cavity 301 of pipe pile 300. After the flap 101 of sealing cap 100 is tightly close together, continue to insert to the design depth. (6) Inject grout 303 into the pile cavity 301 from the hole of the pipe pile 300 until the grout 303 fills the hole; (7) Construction of the base plate 400 includes first laying the pad layer 403, then laying the waterproof layer 402, then pouring the waterproof protective layer 401, and finally anchoring the upper part of the fine-rolled threaded steel bar 210 into the base plate 400 and anchoring it through the bearing plate 201 and reinforcing nut 202 of the upper bearing body 204.

[0054] Example 7 like Figure 22As shown, this embodiment provides a tension-compression composite anchoring node for connecting a bottom plate to an anti-buoyancy pipe pile, including a sealing cap 100, a fine-rolled threaded steel bar 210, an upper bearing body 204, a lower bearing body 205, and a sleeve 211; The lower part of the fine-rolled threaded steel bar 210 is inserted into the pile cavity 301 of the pipe pile 300, and the upper part is anchored into the base plate 400. The pile cavity 301 of the pipe pile 300 is filled with grout 303. The bottom end of the fine-rolled threaded steel bar 210 inserted into the pipe pile 300 is connected to a sealing cap 100. The sealing cap 100 includes a flap 101 and an end tube 103. An adjustment joint 102 is provided between the flaps 101. The end tube 103 is provided with a threaded groove 104 and a reinforcing rib 106. The adjustment joint 102 of the sealing cap 100 is inclined in a clockwise direction, and the joint width gradually decreases to zero from top to bottom. A threaded cavity 105 is provided in the end tube 103, and the threaded cavity 105 is provided with threads that match the fine-rolled threaded steel bar 210. The outer diameter of the flap 101 is larger than the inner diameter of the pipe pile 300.

[0055] The upper bearing body 204 is fitted onto the section of the rod in which the finely threaded steel bar 210 is anchored into the base plate 400. The lower bearing body 205 is fitted onto the section of the rod in which the finely threaded steel bar 210 is inserted into the pipe pile 300, and is positioned close to the sealing cap 100. Both the upper bearing body 204 and the lower bearing body 205 have a through hole 203 at their center, and the through hole 203 has threads that match those of the finely threaded steel bar 210. The upper bearing body 204 includes a bearing plate 201 and a reinforcing nut 202. The bearing plate 201 and the reinforcing nut 202 have a communicating through hole, through which the upper end of the finely threaded steel bar 210 passes and is threadedly connected to the reinforcing nut 202.

[0056] The sleeve 211 is sleeved on the finely rolled threaded steel bar 210 between the upper bearing body 204 and the lower bearing body 205, and the two ends of the sleeve 211 abut against the upper bearing body 204 and the lower bearing body 205 respectively.

[0057] The construction method of the tension-compression composite anchoring joint for the anti-buoyancy pipe pile connection base plate provided in Example 7 includes the following steps: (1) Install the lower bearing body 205 on the fine-rolled threaded steel bar 210, located in the rod section of the inserted pipe pile 300, and fix it through the thread in the through hole 203; (2) Install a sealing cap 100 at the bottom end of the fine-rolled threaded steel bar 210 and connect it to the fine-rolled threaded steel bar 210 through the thread in the threaded cavity 105; (3) Install sleeve 211 on the fine-rolled threaded steel bar 210, so that the lower end of sleeve 211 abuts against the lower bearing body 205; (4) Install the bearing body 204 on the fine-rolled threaded steel bar 210, located in the bar section anchored into the bottom plate 400, and fix it through the thread in the through hole 203, and make the upper end of the sleeve 211 abut against the bearing body 204. (5) Insert the lower part of the fine-rolled threaded steel bar 210, which is equipped with sealing cap 100, lower bearing body 205, sleeve 211 and upper bearing body 204, into the pile cavity 301 of pipe pile 300. After the flap 101 of sealing cap 100 is tightly close together, continue to insert to the design depth. (6) Inject grout 303 into the pile cavity 301 from the hole of the pipe pile 300 until the grout 303 fills the hole; (7) Construction of the base plate 400 includes first laying the pad layer 403, then laying the waterproof layer 402, then pouring the waterproof protective layer 401, and finally anchoring the upper part of the fine-rolled threaded steel bar 210 into the base plate 400 and anchoring it through the bearing plate 201 and reinforcing nut 202 of the upper bearing body 204.

[0058] In summary, the present invention forms an adaptive sealing structure by means of the flap 101 of the sealing cap 100 and the adjusting joint 102, which can tightly fit the pile wall 302 after the pipe pile 300 is inserted, thus solving the problem of cement grout loss caused by the gap between the traditional end plate 312 and the inner wall of the pipe pile, and ensuring the density and integrity of the grouting body 303. The unique design of upper bearing body 204 and lower bearing body 205 in conjunction with casing 211 constructs a tension-compression composite stress system, which enables the shear stress at the interface between grouting body 303 and pipe pile 300 to be reasonably distributed and transferred at the bearing body, effectively reducing the stress concentration phenomenon at the borehole opening and significantly improving the pull-out bearing capacity and long-term durability of the joint. By replacing the traditional steel cage structure with 210 high-strength threaded steel bars, the prefabrication of components in the factory and the assembly on site are realized, completely eliminating the tedious process of on-site steel bar binding and welding, and greatly improving construction efficiency. By combining different configurations of the carrier and the casing, a variety of implementation methods, from simplified to reinforced, are provided, which can flexibly adapt to different geological conditions and anti-buoyancy bearing capacity requirements. The simplified structure of Embodiment 3 is suitable for low-requirement scenarios, while the complete configurations of Embodiment 1 and Embodiment 6 provide optimized solutions for high-requirement projects. By isolating the casing 211 in critical areas, the risk of corrosion of the fine-rolled threaded steel bars 210 is effectively reduced. At the same time, combined with the multiple waterproof defenses formed by the pad 403, waterproof layer 402 and waterproof protective layer 401 of the base plate 400, the durability and safety reliability of the underground engineering structure are comprehensively improved.

[0059] Although this document frequently uses terms such as sealing cap, fine-rolled threaded steel bar, pipe pile, pile cavity, base plate, grouting body, sealing cap, flap, end sleeve, and adjusting joint, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tension-compression composite anchoring joint for connecting a bottom plate to an anti-buoyancy pipe pile, characterized in that: Including sealing caps and precision-rolled threaded steel bars; The lower part of the finely rolled threaded steel bar is inserted into the pile cavity of the pipe pile, and the upper part is anchored into the bottom plate; the pile cavity of the pipe pile is filled with grout. The bottom of the finely rolled threaded steel bar inserted into the pipe pile is connected to the sealing cap. The sealing cap includes a flap and an end cylinder. An adjustment slot is provided between the flaps. The end cylinder is provided with a threaded groove and a reinforcing rib.

2. The tension-compression composite anchoring joint for the anti-buoyancy pipe pile connecting base plate according to claim 1, characterized in that: It also includes a support body; the support body includes at least one upper support body and / or at least one lower support body; The lower bearing body is sleeved on the rod section of the fine-rolled threaded steel bar inserted into the pipe pile. The lower bearing body has a through hole at its center, and the through hole has threads that match the fine-rolled threaded steel bar. The upper bearing body is sleeved on the rod section of the fine-rolled threaded steel bar anchored into the bottom plate. The upper bearing body has a through hole at its center, and the through hole has threads that match the fine-rolled threaded steel bar.

3. The tension-compression composite anchoring joint for the anti-buoyancy pipe pile connecting base plate according to claim 2, characterized in that: It also includes a sleeve; the sleeve is fitted onto the finely rolled threaded steel bar above the lower bearing body.

4. The tension-compression composite anchoring joint for the anti-buoyancy pipe pile connecting base plate according to claim 3, characterized in that: The sleeve is fitted onto the finely rolled threaded steel bar between the upper and lower bearing bodies. The lower end of the sleeve abuts against the lower bearing body, and the upper end of the sleeve abuts against the top of the upper bearing body or the pipe pile.

5. The tension-compression composite anchoring joint for the anti-buoyancy pipe pile connection base plate according to claim 1, characterized in that: The adjusting slit of the sealing cap is inclined in a clockwise direction, and the width of the adjusting slit gradually decreases to zero from top to bottom.

6. The tension-compression composite anchoring joint for the anti-buoyancy pipe pile connecting base plate according to claim 1, characterized in that: The sealing cap has a threaded cavity inside its end sleeve, and the threaded cavity has threads that match the finely rolled threaded steel bar.

7. The tension-compression composite anchoring joint for the anti-buoyancy pipe pile connecting base plate according to claim 1, characterized in that: The outer diameter of the flap of the sealing cap is larger than the inner diameter of the pipe pile.

8. The tension-compression composite anchoring joint for the anti-buoyancy pipe pile connection base plate according to claim 2, characterized in that: The support body includes a support plate and a reinforcing nut. The support plate and the reinforcing nut are provided with a through hole, through which the finely rolled threaded steel bar passes and is threadedly connected to the reinforcing nut.

9. A construction method for a tension-compression composite anchoring joint for an anti-buoyancy pipe pile connecting base plate as described in claim 1, characterized in that, Includes the following steps: A sealing cap is installed at the bottom end of a precision-rolled threaded steel bar. The sealing cap includes a flap and an end tube. An adjustment slot is provided between the flaps, and a threaded groove and reinforcing ribs are provided inside the end tube. The lower part of the fine-rolled threaded steel bar equipped with the sealing cap is inserted into the pile cavity of the pipe pile. After the flaps of the sealing cap are tightly closed, the insertion continues to the design depth. Grout is injected into the pile cavity from the borehole of the pipe pile; The upper part of the finely rolled threaded steel bar is anchored into the completed base plate.

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