Novel anti-floating anchor rod and construction method thereof

Abstract

The invention discloses a novel anti-floating anchor rod. The novel anti-floating anchor rod comprises a bottom anchoring part, a top anchoring part and an anchor cable. The top anchoring part is composed of an anchor backing plate and a working anchorage device, the anchor backing plate is composed of a lower pressure-bearing plate and an upper pressure-bearing cylinder, and the upper pressure-bearing cylinder is provided with a grouting hole. The bottom anchoring part comprises a guide bracket and a bearing plate, the anchor cable is connected with the bearing plate through a sealing locking nut, and the bearing plate is provided with a guide bracket mounting hole, an anchor cable hole and a grouting pipe hole. A waterproof rubber ring is arranged in the sealing locking nut, and the extrusion sleeve is filled with an anti-corrosion medium. A water swelling rubber ring and an isolation support are arranged on the anchor cable, grouting is completed after the anchor cable is tensioned through a grouting hole and a second center hole, and the phenomenon that underground water permeates along gaps of the rod body to cause water leakage is prevented. The invention further discloses a construction method of the novel anti-floating anchor rod. The construction method comprises the following steps of drilling, placing the bottom anchoring part, arranging the waterproof steel sleeve, treating the surface of the anchor cable, placing the lower bearing plate, installing the anchor bearing plate, tensioning the anchor cable and grouting. And through the method of firstly tensioning and then completing grouting, underground water permeation is prevented, and the waterproof performance of the underground structure is improved.

Description

Technical Field

[0001] The invention relates to the field of anti-floating anchor rods, in particular to a novel anti-floating anchor rod and a construction method thereof. Background Art

[0002] Anti-floating anchor rod is a fixing device used to prevent underground buildings from floating up due to the buoyancy or uplift of groundwater. It is mainly used in underground projects such as basements, underground garages, and subway stations. It is made of high-strength steel bars or steel cables, including anchoring sections, free sections, and connectors, and is tightly combined with the foundation through grouting or expansion materials. Its main function is to prevent the structure from floating up, increase structural safety, and reduce foundation settlement. Anti-floating anchor rods are widely used in projects such as basements, underground parking lots, subway stations, and pools that need to prevent floating up. The design and construction must consider geological conditions, structural loads, and construction processes to ensure their effectiveness and safety. Existing anti-floating anchor rods are generally constructed by post-tensioning. When the anchor rod is stressed, the main line of the rod body has a certain amount of elongation, so there will be a gap between the lower bearing end (underground end) and the upper bearing end (tensioning anchor end) for free expansion and contraction, that is, the free section. After the tensioning is completed, grouting and anchor sealing are performed. Because the shrinkage ratio of the rod material is different from that of the concrete, gaps will appear. The foundation water will seep up along the gaps in the rod to the tensioning anchor end at the top of the anchor rod, that is, the upper plane of the bottom plate layer, causing underground leakage. Summary of the invention

[0003] The present invention discloses a novel anti-floating anchor rod, comprising a bottom anchoring part, a top anchoring part and an anchor cable. The top anchoring part is composed of an anchor pad and a working anchor, and the anchor pad is composed of a lower pressure-bearing plate and an upper pressure-bearing tube, and the upper pressure-bearing tube is provided with a grouting hole. The bottom anchoring part comprises a guide bracket and a bearing plate, and the anchor cable is connected to the bearing plate through a sealing locking nut, and the bearing plate is provided with a guide bracket mounting hole, an anchor cable hole and a grouting pipe hole. A waterproof rubber ring is arranged in the sealing locking nut, and the extrusion sleeve is filled with an anti-corrosion medium. A water-expandable rubber ring and an isolation bracket are arranged on the anchor cable, and through the grouting hole and the second center hole, the anchor cable is tensioned first and then fully grouted, so as to avoid the surface material of the anchor rod being torn after the slurry hardens, and to prevent groundwater from penetrating along the gap of the rod body to cause water leakage.

[0004] The invention also discloses a novel construction method of an anti-floating anchor rod, comprising the following steps: drilling, placing a bottom anchoring portion, setting a waterproof steel casing, treating the surface of the anchor cable, placing a lower pressure plate, installing an anchor pad, tensioning the anchor cable, grouting, and tensioning again. By tensioning first and then grouting, the anchor rod material is prevented from being torn after the slurry hardens, groundwater penetration is prevented, and the waterproof performance of the underground structure is improved.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A novel anti-floating anchor rod comprises: a bottom anchoring part, a top anchoring part and an anchor cable, wherein the bottom anchoring part and the top anchoring part are connected by the anchor cable;

[0007] The top anchoring part is composed of an anchor plate and a working anchor. The anchor plate is composed of a lower pressure-bearing plate and an upper pressure-bearing cylinder. The lower end surface of the upper pressure-bearing cylinder is semi-embedded and connected to the lower pressure-bearing plate. The lower pressure-bearing plate is provided with a first center hole. A positioning ring is provided on the upper end surface of the lower pressure-bearing plate. A mounting steel bar is provided on the upper end surface of the lower pressure-bearing plate. The upper pressure-bearing cylinder is provided with a second center hole. The first center hole and the second center hole are connected. The upper pressure-bearing cylinder is provided with a grouting hole, which is connected to the first center hole. An anchor installation position is provided on the upper end surface of the upper pressure-bearing cylinder. The working anchor is arranged at the anchor installation position. An anchor cable clamp is embedded in the working anchor, and the upper end of the anchor cable is clamped by the anchor cable clamp.

[0008] It is further arranged that the bottom anchoring part comprises: a guide bracket and a bearing plate, the guide bracket is connected to the bearing plate, the lower end of the anchor cable is connected to the bearing plate, and a guide cone cap is arranged at the lower end of the guide bracket.

[0009] It is further configured that the bearing plate is provided with: a guide bracket mounting hole, an anchor cable hole, and a grouting pipe hole; the guide bracket is connected to the guide bracket mounting hole; a sealing locking nut is sleeved in the anchor cable hole; a waterproof rubber ring is provided on the inner side of the sealing locking nut; the anchor cable passes through the sealing locking nut and is connected to the extrusion sleeve; an extrusion spring is provided on the inner side of the extrusion sleeve; and the grouting pipe hole is passed through by the grouting pipe.

[0010] It is further provided that the anchor cable, the sealing locking nut and the extrusion sleeve located at the lower end surface of the bearing plate are sealed with the sealing tube and the lower end surface of the bearing plate, and the extrusion sleeve is filled with an anti-corrosion medium. The anchor cable, the sealing locking nut and the extrusion sleeve located at the lower end surface of the bearing plate are sealed with the sealing tube and the lower end surface of the bearing plate, and the anti-corrosion medium is filled therein to prevent the lower end of the anchor cable from being infiltrated by the foundation water, and further prevent the anchor cable from being used as a channel for the foundation water to seep upward from the source.

[0011] It is further arranged that the anchor cable is sleeved by a water-swellable rubber ring, the water-swellable rubber ring is arranged in the second center hole, and the water-swellable rubber ring is arranged below the grouting outlet of the grouting hole.

[0012] It is further provided that an isolation bracket is provided at a position of the anchor cable between the bottom anchoring portion and the top anchoring portion.

[0013] The present invention discloses a novel anti-floating anchor rod, which is provided with grouting holes and a second center hole in the upper pressure-bearing tube, so that the anchor cable can be pre-tensioned before full grouting, thereby avoiding the material on the surface of the anchor rod being torn and scratched after the slurry hardens, thereby causing foundation water to seep up along the gaps in the rod body to the top of the anchor rod and cause water leakage in the underground layer.

[0014] The invention discloses a method for construction using a novel anti-floating anchor rod, comprising the following steps:

[0015] Step 1: Drill holes to meet design requirements and enter the medium weathered layer;

[0016] Step 2: Place the bottom anchoring part connected to the anchor cable, place the bottom anchoring part to the target depth, and set a spiral rib on the bottom anchoring part;

[0017] Step 3: Put a waterproof steel casing into the hole opening, then pour the cm cushion layer, and waterproof the inner wall of the waterproof steel casing and the cushion layer;

[0018] Step 4: Remove the surface material and oil from the anchor cable above the cushion layer; insert a water-swellable rubber ring; the water-swellable rubber ring is set at a position lower than the position where the surface material of the anchor cable is removed, and the water-swellable rubber ring fills the gap between the anchor cable and the inner wall of the first center hole after contacting water to further prevent the possibility of groundwater seepage;

[0019] Step 5: Stop grouting when the grouting reaches the lower end of the waterproof steel casing, put in the threaded reinforcement, and then put down the lower pressure plate on the cushion layer, and the anchor cable passes through the lower pressure plate;

[0020] Step 6: An anchor pad is placed on the lower pressure plate, and the anchor cable passes through the first center hole in the lower pressure plate, the second center hole in the upper pressure tube, and the working anchor in sequence, and is clamped by the anchor cable clamp ring. The portion clamped by the anchor cable clamp ring is the portion of the anchor cable whose surface material has been removed;

[0021] Step 7: The anchor cable is tensioned by the winch and tool anchor;

[0022] Step 8: After tensioning is completed, inject waterproof material into the anchor hole from the grouting hole until it reaches the upper end surface of the lower pressure plate, and then grouting is performed until the second center hole is filled.

[0023] Step 9: Bend the mounting steel bars according to construction requirements until they can be connected to the steel bars of the bottom slab layer and connect them.

[0024] The invention discloses a method for construction using a novel anti-floating anchor rod, which uses a construction method of first stretching the anchor cable and then completing the grouting in combination with the novel anti-floating anchor rod, thereby preventing the material on the surface of the anchor rod from being torn and scratched after the slurry hardens, thereby causing foundation water to seep up along the gaps in the rod body to the top of the anchor rod and cause water leakage in the underground layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the present invention in an application state;

[0026] Figure 2 For the present invention Figure 1 The enlarged structural diagram at A in the middle;

[0027] Figure 3 For the present invention Figure 1 The structure diagram at B is enlarged;

[0028] Figure 4 is a cross-sectional view of the split anchor pad of the present invention;

[0029] Figure 5 A top view of a carrier plate of the present invention;

[0030] Figure 6 A cross-sectional view of a carrier plate of the present invention;

[0031] Figure 7 A front view of the anchoring bracket of the present invention;

[0032] Figure 8 A bottom view of the anchoring bracket of the present invention;

[0033] Fig. 9 A top view of the lower pressure plate of the present invention;

[0034] Fig.10 It is a schematic diagram of the prior art application state;

[0035] In the figure: bottom anchoring part 1, guide bracket 21, guide cone cap 22,

[0036] Loading plate 3, guide bracket mounting hole 31, anchor cable hole 32, grouting pipe hole 33,

[0037] Sealing tube 41, sealing locking nut 42 (with built-in waterproof rubber ring), extrusion sleeve 43 (with built-in extrusion spring), anti-corrosion medium 44,

[0038] Top anchoring part 5, anchor pad 6, lower pressure plate 61, first center hole 611, mounting steel bar 612, positioning ring 613, mounting steel bar 612, positioning ring 613, upper pressure tube 62, grouting hole 621, second center hole 622, anchor installation position 623, working anchor 7, anchor cable clamp ring 71,

[0039] Anchor cable 81 , isolation bracket 82 , water-swellable rubber ring 83 , anchor rod hole 91 , cushion layer 92 , waterproof steel casing 93 , fine stone concrete 94 , bottom plate layer 95 , surface layer 96 , anchor pad 101 . DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0043] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0044] According to the contents of the claims and the description, the specific implementation is as follows:

[0045] The present invention provides a novel anti-floating anchor rod, comprising: a bottom anchoring portion 1, a top anchoring portion 5, and an anchor cable 81, wherein the bottom anchoring portion 1 and the top anchoring portion 5 are connected by the anchor cable 81;

[0046] The top anchoring part 5 is composed of an anchor plate 6 and a working anchor 7. The anchor plate 6 is composed of a lower pressure-bearing plate 61 and an upper pressure-bearing cylinder 62. The lower end surface of the upper pressure-bearing cylinder 62 is semi-embedded and connected to the lower pressure-bearing plate 61. The lower pressure-bearing plate 61 is provided with a first center hole 611. The upper end surface of the lower pressure-bearing plate 61 is provided with a positioning ring 613. The upper end surface of the lower pressure-bearing plate 61 is provided with a mounting steel bar 612. The upper pressure-bearing cylinder 62 is provided with a second center hole 622. The first center hole 611 and the second center hole 622 are connected. The upper pressure-bearing cylinder 62 is provided with a grouting hole 621. The grouting hole 621 is connected to the first center hole 611. The upper end surface of the upper pressure-bearing cylinder 62 is provided with an anchor installation position 623. The working anchor 7 is arranged at the anchor installation position 623. An anchor cable clamp 71 is embedded in the working anchor 7. The upper end of the anchor cable 81 is clamped by the anchor cable clamp 71. The portion of the upper end of the anchor cable 81 clamped by the anchor cable clamp ring 71 is the position where the surface material of the anchor cable 81 is removed. The interior of the anchor cable 81 with the surface material removed is an unbonded steel strand, which facilitates the clamping of the anchor cable clamp ring 71 and prevents the surface material of the anchor cable 81 from being torn during the process of being clamped and stretched by the anchor cable clamp ring 71. If the surface material of the anchor cable 81 is torn, the underground foundation water will penetrate upward along the analysis between the unbonded steel strands.

[0047] The bottom anchoring part 1 includes: a guide bracket 21 and a bearing plate 3. The guide bracket 21 is connected to the bearing plate 3. The lower end of the anchor cable 81 is connected to the bearing plate 3. A guide cone cap 22 is provided at the lower end of the guide bracket 21. The guide bracket 21 is a three-pronged bracket made of steel bars to protect the lower end of the anchor cable 81 from being punctured by gravel. The guide cone cap 22 is a cone head at the lower end of the guide bracket 21 to protect the bottom anchoring part 1 from falling.

[0048] The bearing plate 3 is provided with: a guide bracket mounting hole 31, an anchor cable hole 32, and a grouting pipe hole 33. The guide bracket 21 is connected to the guide bracket mounting hole 31. A sealing locking nut 42 is sleeved in the anchor cable hole 32. A waterproof rubber ring is arranged inside the sealing locking nut 42. The anchor cable 81 passes through the sealing locking nut 42 and is connected to the extrusion sleeve 43. An extrusion spring is arranged inside the extrusion sleeve 43. The grouting pipe hole 33 is passed through by the grouting pipe. The grouting pipe is arranged to meet the need in the grouting process to meet the need for the grouting pipe to be lower than the slurry surface during the grouting process to reduce the amount of pores in the slurry caused by the impact of the slurry.

[0049] The anchor cable 81, the sealing locking nut 42 and the extrusion sleeve 43 located at the lower end surface of the bearing plate 3 are sealed with the lower end surface of the bearing plate 3 by the sealing tube 41, and the seal prevents the end surface of the anchor cable 81 from being penetrated by the underground foundation water.

[0050] The extrusion sleeve 43 is filled with an anti-corrosion medium 44. The anti-corrosion medium prevents the unbonded steel strand from rusting and decaying, thereby preventing the unbonded steel strand from rusting and causing its performance to deteriorate.

[0051] The anchor cable 81 is sleeved by a water-swellable rubber ring 83, which is arranged in the second center hole 622 and below the grouting outlet of the grouting hole 621. The water-swellable rubber ring 83 is arranged at a position lower than the position where the surface material of the anchor cable 81 is removed. When the water-swellable rubber ring 83 is exposed to water, it fills the gap between the anchor cable 81 and the inner wall of the first center hole 611 to further prevent the possibility of groundwater seepage.

[0052] An isolation bracket 82 is provided at a position of the anchor cable 81 between the bottom anchor portion 1 and the top anchor portion 5 .

[0053] The present invention provides a novel construction method for anti-floating anchor rods, and the construction process is as follows:

[0054] Step 1: Drill holes to meet design requirements and enter the medium weathered layer.

[0055] Step 2: insert the bottom anchoring part 1 connected to the anchor cable 81, and place the bottom anchoring part 1 to the target depth, with a spiral rib arranged on the bottom anchoring part 1;

[0056] Step 3: Put the waterproof steel casing 93 into the hole opening, and then pour the 10cm cushion waterproof steel casing into it, and at the same time, waterproof the inner wall of the waterproof steel casing 93 and the cushion 92;

[0057] Note 1: Steps 2 and 3 can be reversed.

[0058] Step 4: Remove the surface material and oil from the anchor cable 81 above the cushion layer 92; insert the water-swellable rubber ring 83; the water-swellable rubber ring 83 is set at a position lower than the position where the surface material of the anchor cable 81 is removed, and the water-swellable rubber ring 83 fills the gap between the anchor cable 81 and the inner wall of the first center hole 611 after contacting water to further prevent the possibility of groundwater seepage;

[0059] Step 5: Stop grouting until the lower end of the waterproof steel casing 93, put in the threaded reinforcement, and then put down the lower pressure plate 61 on the cushion layer, and the anchor cable 81 passes through the lower pressure plate 61;

[0060] Step 6: An anchor pad 6 is placed on the lower pressure plate 61, and the anchor cable 81 passes through the first center hole 611 in the lower pressure plate 61, the second center hole 622 in the upper pressure tube 62, and the working anchor 7 in sequence, and is clamped by the anchor cable clamp ring 71. The portion clamped by the anchor cable clamp ring 71 is the unbonded steel strand of the anchor cable 81 with the surface material removed;

[0061] Step 7: The anchor cable 81 is tensioned by the winch and the tool anchor;

[0062] Step 8: After the tensioning is completed, the waterproof material is injected into the anchor hole 91 from the grouting hole 621 until it reaches the upper end surface of the lower pressure plate 61, and then grouting is performed until the second center hole 622 is filled.

[0063] Step 9: Bend the mounting steel bars 612 according to construction requirements to a state where they can be connected to the steel bars of the bottom plate layer 95 and connect them.

[0064] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A new type of anti-floating anchor, characterized in that: include: A bottom anchoring portion (1), a top anchoring portion (5), and an anchor cable (81), wherein the bottom anchoring portion (1) and the top anchoring portion (5) are connected via the anchor cable (81); The top anchoring part (5) is composed of an anchor plate (6) and a working anchor (7); the anchor plate (6) is composed of a lower pressure-bearing plate (61) and an upper pressure-bearing tube (62); the lower end surface of the upper pressure-bearing tube (62) is semi-embedded and connected to the lower pressure-bearing plate (61); the lower pressure-bearing plate (61) is provided with a first center hole (611); the upper end surface of the lower pressure-bearing plate (61) is provided with a positioning ring (613); the upper end surface of the lower pressure-bearing plate (61) is provided with a mounting steel bar (612); the upper pressure-bearing tube (62) is provided with The second center hole (622) is connected to the first center hole (611), the upper pressure-bearing cylinder (62) is provided with a grouting hole (621), the grouting hole (621) is connected to the first center hole (611), the upper end surface of the upper pressure-bearing cylinder (62) is provided with an anchor installation position (623), the working anchor (7) is arranged at the anchor installation position (623), an anchor cable clamp ring (71) is embedded in the working anchor (7), and the upper end of the anchor cable (81) is clamped by the anchor cable clamp ring (71).

2. A novel anti-floating anchor rod according to claim 1, characterized in that: The bottom anchoring portion (1) comprises: a guide bracket (21) and a bearing plate (3); the guide bracket (21) is connected to the bearing plate (3); the lower end of the anchor cable (81) is connected to the bearing plate (3); and a guide cone cap (22) is provided at the lower end of the guide bracket (21).

3. A novel anti-floating anchor rod according to claim 2, characterized in that: The bearing plate (3) is provided with: a guide bracket mounting hole (31), an anchor cable hole (32), and a grouting pipe hole (33); the guide bracket (21) is connected to the guide bracket mounting hole (31); a sealing locking nut (42) is sleeved in the anchor cable hole (32); a waterproof rubber ring is arranged inside the sealing locking nut (42); the anchor cable (81) passes through the sealing locking nut (42) and is connected to the extrusion sleeve (43); an extrusion spring is arranged inside the extrusion sleeve (43); and the grouting pipe hole (33) is penetrated by the grouting pipe.

4. A novel anti-floating anchor rod according to claim 3, characterized in that: The anchor cable (81), the sealing lock nut (42) and the extrusion sleeve (43) located at the lower end surface of the bearing plate (3) are sealed by the sealing tube (41) and the lower end surface of the bearing plate (3), and the extrusion sleeve (43) is filled with an anti-corrosion medium (44).

5. A novel anti-floating anchor rod according to claim 4, characterized in that: The anchor cable (81) is sleeved by a water-swellable rubber ring (83), which is arranged in the second central hole (622) and below the grouting outlet of the grouting hole (621).

6. A novel anti-floating anchor rod according to claim 5, characterized in that: An isolation bracket (82) is provided at a position of the anchor cable (81) between the bottom anchoring portion (1) and the top anchoring portion (5).

7. A method for construction using a new type of anti-floating anchor rod, characterized in that: The process includes the following steps: Step 1: Drill holes to meet design requirements and enter the medium weathered layer; Step 2: inserting a bottom anchoring part (1) connected to the anchor cable (81), placing the bottom anchoring part (1) to a target depth, and providing a spiral rib on the bottom anchoring part (1); Step 3: Put a waterproof steel casing (93) into the borehole, then pour (10) cm cushion layer (in which the waterproof steel casing is poured), and waterproof the inner wall of the hole of the waterproof steel casing (93) and the cushion layer (92); Step 4: Remove the surface material and oil from the anchor cable (81) above the cushion layer (92); insert a water-swellable rubber ring (83); the water-swellable rubber ring (83) is set at a position lower than the position where the surface material of the anchor cable (81) is removed, and the water-swellable rubber ring (83) fills the gap between the anchor cable (81) and the inner wall of the first center hole (611) after contacting water to further prevent the possibility of groundwater seepage; Step 5: stop grouting when the grouting reaches the lower end of the waterproof steel casing (93), put in the threaded reinforcement, and then put down the lower pressure plate (61) on the cushion layer, and the anchor cable (81) passes through the lower pressure plate (61); Step 6: An anchor pad (6) is placed on the lower pressure plate (61), and the anchor cable (81) passes through the first center hole (611) provided in the lower pressure plate (61), the second center hole (622) provided in the upper pressure tube (62), and the working anchor (7) in sequence, and is then clamped by the anchor cable clamp ring (71). The portion clamped by the anchor cable clamp ring (71) is the portion of the anchor cable (81) from which the surface material has been removed (unbonded steel strand); Step 7: The anchor cable (81) is tensioned by the winch and the tool anchor; Step 8: After the tensioning is completed, the waterproof material is injected into the anchor hole (91) from the grouting hole (621) until it reaches the upper end surface of the lower pressure plate (61), and then grouting is performed until the second center hole (622) is filled; Step 9: Bend the mounting steel bars (612) to a state where they can be connected to the steel bars of the bottom plate layer (95) according to construction requirements and connect them.

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