Anti-seepage plugging construction node of rear anchor rod plug
By using the rear anchor plug to prevent leakage in the construction nodes in the anti-floating anchor construction, the embedded steel casing, water stop flange, steel pad plate, fine rolled nut and micro-expanded concrete components are used to solve the problem of leakage hazards on the bottom plate opening, the safety and stability of the structure are achieved, and the maintenance cost is reduced.
Patent Information
- Application Number
- CN202421418680.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-20
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-06-20
AI Technical Summary
During the construction of anti-floating anchors, the reserved bottom plate holes are prone to leakage risks, resulting in high cost of later maintenance and repair, affecting the normal use function of the structure.
The rear anchor plug is used to prevent leakage from sealing the construction nodes, including the embedded steel casing installed in the foundation base plate and the anti-floating anchor rod installed in the embedded steel casing. Through components such as water stop flange, steel pads, fine rolled nuts and micro-expanded concrete, multiple anti-leakage measures are provided to ensure the stability and safety of the structure.
It effectively prevents leakage from the bottom plate opening, reduces the cost of later maintenance, ensures the safety and stability of the structure, reduces hidden dangers in the construction of anti-floating anchors, and improves construction efficiency.
Smart Images
Figure CN222923803U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of anti - floating anchor rod construction, and specifically discloses a construction joint for preventing leakage of a plug of a post - installed anchor rod. Background Technique
[0002] With the diversification of building structures and the popularization of supporting buildings with towers and podium buildings, structural anti - floating is an important and non - negligible point in modern projects. As a result, the foundations of the vast majority of construction projects are no longer designed as simple independent foundations, raft foundations, etc., but a large number of anti - floating anchor rods appear. To ensure the overall anti - floating performance of the structure, in foundation engineering, people usually focus on the durability and safety of the foundation project, while ignoring the impact of anti - floating anchor rods on the entire foundation pit. A large number of engineering practices have shown that the construction quality of anti - floating anchor rods is one of the key links for the success of the entire project. If the construction of anti - floating anchor rods is improper, problems such as cracking of the floor slab and even tearing of load - bearing columns may occur after the project is completed due to the large underground water level difference and water pressure, affecting its service function and safety; especially when the excavation depth of the foundation pit is large and the underground water level is high, the construction quality of anti - floating anchor rods will have a huge impact on the project.
[0003] During the on - site construction application of anti - floating anchor rods for the basement floor slab, when affected by geographical location and surrounding environment, such as projects with ultra - deep foundation pits near existing subway tunnels, projects with high requirements for the protection of the structural deformation of surrounding buildings, projects with large deformations of foundation pit support, etc., after the earthwork is excavated to the design elevation of the floor slab, it is necessary to promptly seal the floor slab structure, reduce the exposure time of the original soil surface, and quickly form a force - transmitting counter - brace by sealing the floor slab structure to ensure the safety and stability of the foundation pit support structure. To solve this technical problem, in some projects, the form of pre - embedded casing is used to transfer the anti - floating anchor rod process of the basement foundation from the construction before the cushion layer to the construction after the basement floor slab is completed, so as to form an effective counter - brace as early as possible to protect the structural stability and safety. However, such a construction method will lead to the reserved floor slab openings being prone to leakage hazards in the later stage. If not properly handled, it will result in a large amount of maintenance and repair costs in the later stage and affect the normal service function of the structure. Therefore, sealing the basement floor slab of the project under the post - installed anchor rod construction system early and effectively can ensure the operation and use of surrounding underground structures and the safety of the foundation pit support structure, and reduce the maintenance cost. Content of the Utility Model
[0004] The purpose of the utility model is to provide a construction joint for preventing leakage of a plug of a post - installed anchor rod, and solve the technical problems mentioned in the above background technique.
[0005] To achieve the above - mentioned purpose, the utility model adopts the following technical scheme:
[0006] A construction joint for preventing leakage of the post - installed anchor rod plug, including a pre - embedded steel casing arranged in the foundation slab and an anti - floating anchor rod arranged in the pre - embedded steel casing. Two water - stop flanges are provided at the upper end of the pre - embedded steel casing. The two water - stop flanges are respectively arranged at the top end and the abdomen of the pre - embedded steel casing. The top surface of the water - stop flange arranged at the top end of the pre - embedded steel casing is flush with the top surface of the pre - embedded steel casing. The water - stop flange is sleeved on the pre - embedded steel casing and is fixedly welded and sealed to the outer periphery of the pre - embedded steel casing. The anti - floating anchor rod is vertically arranged in the pre - embedded steel casing, and the top of the anti - floating anchor rod is higher than the top of the pre - embedded steel casing. A steel backing plate is arranged on the anti - floating anchor rod. The steel backing plate is sleeved on the anti - floating anchor rod and is fixedly welded and sealed to the outer periphery of the anti - floating anchor rod. The top surface of the steel backing plate is flush with the top surface of the pre - embedded steel casing, and the outer periphery of the steel backing plate is fixedly welded and sealed to the inner wall of the pre - embedded steel casing. A fine - rolled nut is arranged on the anti - floating anchor rod. The fine - rolled nut is arranged above the steel backing plate and is thread - connected to the anti - floating anchor rod. The fine - rolled nut is welded to the steel backing plate. Micro - expanded concrete and waterproof grease are respectively arranged in the pre - embedded steel casing. The micro - expanded concrete and the waterproof grease are respectively filled from bottom to top in the gap between the pre - embedded steel casing and the anti - floating anchor rod. Spiral steel bars are arranged in the micro - expanded concrete. A steel mesh is arranged on the pre - embedded steel casing. The steel mesh is arranged below the water - stop flange. Multiple bottom - slab main reinforcements are arranged above the steel backing plate. The bottom - slab main reinforcements are symmetrically arranged around the outer periphery of the steel backing plate. One end of the bottom - slab main reinforcement is fixedly welded to the steel backing plate. Continuity steel bars are arranged between the bottom - slab main reinforcements and are welded between the symmetric bottom - slab main reinforcements. Plugging concrete is arranged above the steel backing plate. The plugging concrete covers the bottom - slab main reinforcements and the continuity steel bars, and the top surface of the plugging concrete is flush with the top surface of the foundation slab.
[0007] Further, the water - stop flange is an annular plate with a thickness of 6 mm and a width of 140 mm, and the inner diameter specification of the water - stop flange ring is adapted to the outer diameter specification of the pre - embedded steel casing.
[0008] Furthermore, a plurality of double - spliced positioners are arranged on the outer periphery of the anti - floating anchor rod. The vertical spacing of the double - spliced positioners is 2000 mm, and the outer periphery of the double - spliced positioners abuts against the inner wall of the pre - embedded steel casing.
[0009] Furthermore, the waterproof grease is filled to the top of the pre - embedded steel casing, and the filling thickness of the waterproof grease is 50 mm.
[0010] Furthermore, the pre - embedded steel casing is a seamless steel pipe with a diameter of 200 mm and a wall thickness of 6 mm, and the anti - floating anchor rod is a fine - rolled threaded steel bar with a diameter of 40 mm.
[0011] Furthermore, the steel backing plate is an annular plate with a thickness of 20 mm, and the inner diameter specification of the steel backing plate ring is adapted to the outer diameter specification of the anti - floating anchor rod.
[0012] Furthermore, the micro - expanded concrete is fine - aggregate concrete with 8% expansion agent added, and the plugging concrete has the same material as the micro - expanded concrete.
[0013] Furthermore, the steel mesh is a rectangular crack-resistant mesh with dimensions of 4mm * 200mm * 200mm.
[0014] Compared with the prior art, the present utility model has the following characteristics and beneficial effects:
[0015] The present utility model discloses a construction joint for preventing leakage of a post-embedded anchor rod plug, which includes a pre-embedded steel casing provided in the foundation slab and an anti-floating anchor rod provided in the pre-embedded steel casing. By providing two water-stop flanges at the upper end of the pre-embedded steel casing, the first anti-leakage measure is provided to extend the leakage radius. By providing a steel backing plate on the anti-floating anchor rod, the outer periphery of the steel backing plate is hermetically welded and fixed to the inner wall of the pre-embedded steel casing, thereby playing a role in connecting with the foundation slab and providing a part of the resistance to groundwater pressure. By providing a fine-rolled nut at the upper end of the anti-floating anchor rod, the fine-rolled nut is threadedly connected to the anti-floating anchor rod, and the fine-rolled nut is welded to the steel backing plate, thereby being used to seal the gap between the anti-floating anchor rod body and the steel backing plate, and being able to provide a reaction force against groundwater pressure together with the steel backing plate by screwing tightly with the anti-floating anchor rod. By filling the pre-embedded steel casing with micro-expansive concrete and waterproof grease respectively, it can prevent a small amount of water leakage caused by the shrinkage of the expansive concrete, and can avoid the leakage caused by the appearance of gaps in the expansive concrete under long-term water pressure. The overall structure is stable, the plugging effect is good, ensuring that under various conditions, a good anti-leakage effect can be achieved at the anti-floating anchor rod, reducing the leakage hidden danger, reducing the later maintenance cost, and having extremely strong versatility, not affected by geological conditions. The pre-embedded steel casing can be processed in advance off-site, saving labor costs and improving construction efficiency. It has the characteristics of safety and applicability, has good promotion and practical value, and will generate good economic benefits after extensive promotion and application. Description of the Drawings
[0016] Figure 1 It is a schematic diagram of the overall structure of the present utility model;
[0017] Figure 2 It is a schematic top view structure of the steel backing plate and the water-stop flange of the present utility model;
[0018] Figure 3 It is a schematic diagram of the pre-embedded steel casing structure of the present utility model.
[0019] Reference numerals: 1, foundation slab; 2, pre-embedded steel casing; 3, anti-floating anchor rod; 4, water-stop flange; 5, steel backing plate; 6, fine-rolled nut; 7, micro-expansive concrete; 8, waterproof grease; 9, spiral steel bar; 10, steel mesh; 11, bottom slab reinforcement; 12, continuous reinforcement; 13, plugging concrete; 14, double-piece locator. Detailed Embodiment
[0020] In order to make the technical means, innovative features, achieved objectives and effects realized by the present utility model easy to understand, the present utility model will be further described below.
[0021] The embodiments described herein are specific specific embodiments of the present utility model and are used to illustrate the concept of the present utility model. They are all explanatory and exemplary and should not be construed as limiting the embodiments of the present utility model and the scope of the present utility model. Except for the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the content disclosed in the claims and the specification of this application. These technical solutions include technical solutions that make any obvious substitutions and modifications to the embodiments described herein.
[0022] The present utility model discloses a construction joint for preventing leakage of a post-anchored plug, as Figures 1 to 3As shown in the figure, it includes a pre-embedded steel casing 2 vertically arranged in the foundation bottom plate 1 and an anti-floating anchor rod 3 arranged in the pre-embedded steel casing 2. The pre-embedded steel casing 2 is made of seamless steel pipe with a diameter of 200 mm and a wall thickness of 6 mm. The bottom end of the pre-embedded steel casing 2 extends outside the foundation bottom plate 1. There are two water-stop flanges 4 arranged inside the foundation bottom plate 1 on the outer periphery of the upper end of the pre-embedded steel casing 2. The two water-stop flanges 4 are respectively arranged at the top end and the abdomen of the pre-embedded steel casing 2. The top surface of the water-stop flange 4 arranged at the top end of the pre-embedded steel casing 2 is flush with the top surface of the pre-embedded steel casing 2. The water-stop flange 4 is an annular plate with a thickness of 6 mm and a width of 140 mm. The inner diameter specification of the ring of the water-stop flange 4 is adapted to the outer diameter specification of the pre-embedded steel casing 2. The water-stop flange 4 is sleeved on the pre-embedded steel casing 2 and fixedly welded to the outer periphery of the pre-embedded steel casing 2 in a sealed manner, thereby providing the first anti-leakage measure and extending the leakage radius. The anti-floating anchor rod 3 is a precision rolled threaded steel bar with a diameter of 40 mm. The anti-floating anchor rod 3 is vertically arranged in the middle of the pre-embedded steel casing 2. The central axis of the anti-floating anchor rod 3 coincides with the central axis of the pre-embedded steel casing 2. The top end of the anti-floating anchor rod 3 is higher than the top end of the pre-embedded steel casing 2. There are multiple double-spliced positioners 14 arranged on the outer periphery of the anti-floating anchor rod 3. The vertical spacing of the double-spliced positioners 14 is 2000 mm. The outer periphery of the double-spliced positioners 14 abuts against the inner wall of the pre-embedded steel casing 2, thereby ensuring the verticality of the anti-floating anchor rod 3 during construction and avoiding problems such as the collapse of the surrounding soil caused by the deviation of the anti-floating anchor rod 3 and insufficient anti-pulling force of the anchor rod. There is a steel backing plate 5 arranged at the upper end of the anti-floating anchor rod 3. The steel backing plate 5 is an annular plate with a thickness of 20 mm. The inner diameter specification of the ring of the steel backing plate 5 is adapted to the outer diameter specification of the anti-floating anchor rod 3. The steel backing plate 5 is sleeved on the anti-floating anchor rod 3 and fixedly welded to the outer periphery of the anti-floating anchor rod 3 in a sealed manner. The top surface of the steel backing plate 5 is flush with the top surface of the pre-embedded steel casing 2. The outer periphery of the steel backing plate 5 is fixedly welded to the inner wall of the pre-embedded steel casing 2 in a sealed manner, thereby playing a role in connecting with the foundation bottom plate 1 and providing a part of the resistance to groundwater pressure. There is a precision rolled nut 6 arranged at the upper end of the anti-floating anchor rod 3. The precision rolled nut 6 is arranged above the steel backing plate 5. There is an external thread arranged on the outer periphery of the upper end of the anti-floating anchor rod 3. The precision rolled nut 6 is threadedly connected with the anti-floating anchor rod 3. The precision rolled nut 6 is welded to the steel backing plate 5, thereby being used to seal the gap between the rod body of the anti-floating anchor rod 3 and the steel backing plate 5, and being able to provide a reaction force against groundwater pressure together with the steel backing plate 5 by screwing tightly with the anti-floating anchor rod 3. The pre-embedded steel casing 2 is respectively filled with micro-expansion concrete 7 and waterproof grease 8. The micro-expansion concrete 7 and the waterproof grease 8 are filled in the internal gap between the pre-embedded steel casing 2 and the anti-floating anchor rod 3. The waterproof grease 8 is arranged above the micro-expansion concrete 7. The waterproof grease 8 is filled to the top end of the pre-embedded steel casing 2. The filling thickness of the waterproof grease 8 is 50 mm, thereby preventing a small amount of water leakage caused by the shrinkage of the expansion concrete and being able to avoid leakage caused by the appearance of gaps in the expansion concrete under long-term water pressure. The micro-expansion concrete 7 is fine aggregate concrete mixed with 8% expansion agent. The micro-expansion concrete 7 fills the internal gap between the pre-embedded steel casing 2 and the anti-floating anchor rod 3 to prevent groundwater from seeping out from the inside of the pre-embedded steel casing 2. The micro-expansion concrete 7 is provided with spiral steel bars 9.Enhance the bonding strength of the slightly expanding concrete 7 inside the embedded steel casing 2 to prevent the slightly expanding concrete 7 from cracking and causing water seepage through the cracks; there are steel mesh sheets 10 on the upper part of the embedded steel casing 2 and the bottom surface of the foundation slab 1, and the steel mesh sheets 10 are arranged below the water-stop flange 4. The steel mesh sheets 10 are rectangular crack-resistant mesh sheets with a size of 4mm * 200mm * 200mm to prevent the surrounding soil from collapsing during the construction of the anti-floating anchor rod 3 and causing hole collapse. Above the steel backing plate 5 and on the top surface of the foundation slab 1, there are multiple bottom slab top steels 11. The bottom slab top steels 11 are symmetrically arranged around the outer circumference of the steel backing plate 5. One end of the bottom slab top steel 11 is placed on the steel backing plate 5 and welded to the steel backing plate 5. Above the steel backing plate 5, there is a continuous reinforcement 12, and the continuous reinforcement 12 is welded between the symmetrically arranged bottom slab top steels 11. Above the steel backing plate 5, there is a plugging concrete 13, and the plugging concrete 13 covers the bottom slab top steels 11 and the continuous reinforcement 12. The plugging concrete 13 is made of the same material as the slightly expanding concrete 7, and the top surface of the plugging concrete 13 is flush with the top surface of the foundation slab 1.,
[0023] During construction, the embedded steel casing 2 is prefabricated in a centralized manner in advance. The embedded steel casing 2 is made of seamless steel pipe with a diameter of 200mm and a wall thickness of 6mm. Two water-stop flanges 4 are added to the embedded steel casing 2. The two water-stop flanges 4 are respectively arranged at the top end and the abdomen of the embedded steel casing 2. The top surface of the water-stop flange 4 arranged at the top end of the embedded steel casing 2 is flush with the top surface of the embedded steel casing 2, and the water-stop flange 4 is welded to the embedded steel casing 2; construct the foundation slab 1 according to the construction drawings. During the construction process, the embedded steel casing 2 is embedded at the predetermined position of the foundation slab 1. When the embedded steel casing 2 is embedded, a finished crack-resistant steel mesh sheet 10 with a size of 4mm * 200mm * 200mm is added to the bottom of the embedded steel casing 2 in advance, and the acting area is 800mm * 800mm; carry out the construction of the post-embedded anti-floating anchor rod 3, and place the anti-floating anchor rod 3 into the embedded steel casing 2. Before lowering the anti-floating anchor rod 3, a steel backing plate 5 is added to the upper end of the anti-floating anchor rod 3. The steel backing plate 5 is sleeved on the anti-floating anchor rod 3 and fixedly welded to the outer circumference of the anti-floating anchor rod 3. A double-spliced positioner 14 is arranged in the middle of the anti-floating anchor rod 3 rod body with a vertical spacing of 2000mm to prevent the rod body from being disturbed. The top surface of the steel backing plate 5 is flush with the top surface of the embedded steel casing 2; clean the water-stop flange 4 of the embedded steel casing 2, and then clean the inside of the embedded steel casing 2. After cleaning, place a spiral reinforcement 9 in the embedded steel casing 2 and pour slightly expanding concrete 7. A 50mm space is reserved at the top of the embedded steel casing 2 and filled with waterproof grease 8; the outer circumference of the steel backing plate 5 is fixedly welded to the inner wall of the embedded steel casing 2. A precision-rolled nut 6 is added to the anti-floating anchor rod 3 rod body. The precision-rolled nut 6 is threadedly connected to the anti-floating anchor rod 3, and the precision-rolled nut 6 is welded to the steel backing plate 5. Finally, the continuous reinforcement 12 is welded between the symmetrically arranged bottom slab top steels 11. After completion, pour the plugging concrete 13 on the bottom slab top steels 11 and the continuous reinforcement 12 to complete the anti-seepage construction of the anti-floating anchor rod 3 plug.,
[0024] The utility model discloses a construction joint for preventing leakage of a post - installed anchor rod plug, which comprises a pre - embedded steel sleeve arranged in a foundation slab and an anti - floating anchor rod arranged in the pre - embedded steel sleeve. By providing two water - stop flanges at the upper end of the pre - embedded steel sleeve, the first anti - leakage measure is provided to extend the leakage radius. By providing a steel backing plate on the anti - floating anchor rod, the outer periphery of the steel backing plate is fixedly sealed and welded to the inner wall of the pre - embedded steel sleeve, and a precision - rolled nut is provided at the upper end of the anti - floating anchor rod. The precision - rolled nut is thread - connected to the anti - floating anchor rod and welded to the steel backing plate, so as to seal the gap between the anti - floating anchor rod body and the steel backing plate. And by the way of screwing tightly with the anti - floating anchor rod in a spiral manner, it can provide a reaction force against the groundwater pressure together with the steel backing plate. The overall structure is stable, the plugging effect is good, and it ensures that under various conditions, a good anti - leakage effect can be achieved at the anti - floating anchor rod.
[0025] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A post-anchor plugging anti-leakage plugging construction node, comprising a pre-buried steel casing (2) arranged in a foundation bottom plate (1), and an anti-floating anchor (3) arranged in the pre-buried steel casing (2), characterized in that: The upper end of the embedded steel casing (2) is provided with two water-stop flanges (4), which are respectively arranged at the top of the embedded steel casing (2) and the belly of the embedded steel casing (2). The top surface of the water-stop flange (4) arranged at the top of the embedded steel casing (2) is flush with the top surface of the embedded steel casing (2). The water-stop flange (4) is sleeved on the embedded steel casing (2) and is sealed and welded to the outer periphery of the embedded steel casing (2). The anti-floating anchor rod (3) is vertically arranged in the embedded steel casing (2), and the top of the anti-floating anchor rod (3) is higher than the top of the embedded steel casing (2). A double-jointed locator (14) is fixedly arranged on the outer periphery of the anti-floating anchor rod (3), and the outer periphery of the double-jointed locator (14) abuts against the inner wall of the embedded steel casing (2). A steel pad (5) is arranged on the anti-floating anchor rod (3), and the steel pad (5) is sleeved on the anti-floating anchor rod (3) and is sealed and welded to the outer periphery of the anti-floating anchor rod (3). The top surface of the steel pad (5) is flush with the top surface of the embedded steel casing (2), and the outer periphery of the steel pad (5) is sealed and welded to the inner wall of the embedded steel casing (2). A precision-rolled nut (6) is arranged on the anti-floating anchor rod (3). Above the backing plate (5), a precision-rolled nut (6) is threadedly connected to the anti-floating anchor rod (3), and the precision-rolled nut (6) is welded to the steel backing plate (5). Micro-expansion concrete (7) and waterproof grease (8) are respectively provided in the embedded steel casing (2). The micro-expansion concrete (7) and the waterproof grease (8) are respectively filled in the gap between the embedded steel casing (2) and the anti-floating anchor rod (3) from bottom to top. Spiral steel bars (9) are provided in the micro-expansion concrete (7). A steel mesh (10) is provided on the embedded steel casing (2). The steel mesh (10) It is arranged below the water stop flange (4), and a plurality of bottom plate ribs (11) are arranged above the steel pad (5), and the bottom plate ribs (11) are symmetrically arranged around the outer periphery of the steel pad (5), and one end of the bottom plate ribs (11) is welded and fixed to the steel pad (5), and connecting steel bars (12) are arranged between the bottom plate ribs (11), and the connecting steel bars (12) are welded between the symmetrical bottom plate ribs (11), and a sealing concrete (13) is arranged above the steel pad (5), and the sealing concrete (13) covers the bottom plate ribs (11) and the connecting steel bars (12).
2. A post-anchor plugging anti-leakage plugging construction node according to claim 1, characterized in that: The water stop flange (4) is an annular plate with a thickness of 6 mm and a width of 140 mm. The inner diameter of the water stop flange (4) is compatible with the outer diameter of the embedded steel casing (2).
3. A post-anchor plugging anti-leakage plugging construction node according to claim 1, characterized in that: The waterproof grease (8) is filled to the top of the embedded steel casing (2), and the filling thickness of the waterproof grease (8) is 50 mm.
4. A post-anchor plugging anti-leakage plugging construction node according to claim 2, characterized in that: The embedded steel casing (2) is a seamless steel pipe with a diameter of 200 mm and a wall thickness of 6 mm, and the anti-floating anchor rod (3) is a precision-rolled threaded steel bar with a diameter of 40 mm.
5. A post-anchor plugging anti-leakage plugging construction node according to claim 1, characterized in that: The steel plate (5) is an annular plate with a thickness of 20 mm, and the inner diameter of the steel plate (5) is compatible with the outer diameter of the anti-floating anchor rod (3).
6. A post-anchor plugging anti-leakage plugging construction node according to claim 1, characterized in that: The steel mesh (10) is a rectangular anti-cracking mesh with a size of 4 mm*200 mm*200 mm.