Anti-floating anchor rod structure and installation method thereof

Abstract

The present invention discloses an anti-floating anchor rod structure and an installation method thereof, comprising a ground and a borehole opened on the ground, the anchor rod structure being inserted in the borehole, the inner wall of the borehole and the anchor rod structure being filled with pressure grouting, a cushion layer being installed on the ground, a waterproof plate being installed on the cushion layer, and the anchor rod structure sequentially penetrating the waterproof plate and the cushion layer. The present invention relates to the technical field of anti-floating anchor rods, the anti-floating anchor rod structure and the installation method thereof change the concept of traditional anti-floating anchor rod design, and increase the linkage between the anti-floating anchor rods by adding waterproof plates and cushion layers of different shapes, so that the anti-floating anchor rods, which were originally subjected to independent force, are combined into a whole to be subjected to common force, so that their stability after linkage is increased, and because the cushion layer and the waterproof plate are designed with different shapes, they can be used to cope with different construction needs. In some specific cases, a flange can be welded on the main anchor rod, and some metal brackets can be quickly installed, which is convenient for people to use.

Description

Technical Field

[0001] The invention relates to the technical field of anti-floating anchor rods, and in particular to an anti-floating anchor rod structure and an installation method thereof. Background Art

[0002] Anti-floating anchor rods are a kind of anti-floating measures for underground structures in construction projects. They are structural components set up to resist the upward displacement of buildings above them. They are related to the height and changes of groundwater levels and are opposite to the force direction of compression piles. The pile body of anti-floating anchor rods is strong in bearing the pressure of building loads.

[0003] In modern civil construction, the application of anti-floating anchor rods is very necessary. For example, the patent with application number 201910868434.6 provides an anti-floating anchor rod. Although it can solve the quality problems caused by sediment and water accumulation to a certain extent, the linkage between its anti-floating anchor rod structure and its installation method is insufficient. It is necessary to change the concept of traditional anti-floating anchor rod design, increase the linkage between anti-floating anchor rods, increase their stability after linkage, and quickly install some metal brackets for people's convenience. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides an anti-floating anchor structure and an installation method thereof, which solves the problem of insufficient linkage between the existing anti-floating anchor structures and their installation methods, and requires a change in the concept of traditional anti-floating anchor design, increasing the linkage between anti-floating anchors, and increasing their stability after linkage.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an anti-floating anchor structure and an installation method thereof, including a ground and a drill hole opened on the ground, an anchor structure inserted in the drill hole, pressure grouting grout filled between the inner wall of the drill hole and the anchor structure, a cushion layer installed on the ground, a waterproof plate installed on the cushion layer, and the anchor structure sequentially passing through the waterproof plate and the cushion layer.

[0006] Preferably, the anchor structure includes a grouting pipe, which is inserted into the borehole, and a plurality of isolation rings are provided on the outside of the grouting pipe. A plurality of main anchors are provided between the grouting pipe and the isolation rings, and the length of the main anchors is approximately equal to that of the grouting pipe. The main anchors are in contact with the inner wall of the isolation ring and the outer wall of the grouting pipe respectively, and a plurality of positioning brackets are inserted between the outer wall of the isolation ring and the inner wall of the borehole and in the pressure grouting, and the front view shape of the positioning bracket is a ship shape or an isosceles trapezoid.

[0007] Preferably, a lower flange is installed on several of the main anchor rods, the grouting pipe passes through the lower flange, the lower flange is embedded in the waterproof plate, the upper surface of the lower flange is flush with the upper surface of the waterproof plate, an upper flange is installed on the lower flange, and several bolts are spirally installed between the upper flange and the lower flange.

[0008] Preferably, an annular groove is provided at the bottom of the upper flange, a first rubber ring is installed on the lower flange, the first rubber ring is engaged with the annular groove, a second rubber ring is installed on the outer ring surface of the upper flange, and the second rubber ring is in contact with the upper surface of the waterproof plate.

[0009] Preferably, the top view shape of the waterproof board is an "I" shape, the cushion layer has the same shape as the waterproof board, and the anchor rod structure is respectively inserted at the left and right ends of the waterproof board.

[0010] Preferably, the top view shape of the waterproof board is a "T" shape, the cushion layer has the same shape as the waterproof board, and the anchor rod structure is respectively inserted in the triangular parts of the waterproof board.

[0011] A method for installing an anti-floating anchor structure, using the anti-floating anchor structure according to any one of claims 1 to 6, comprising the following steps:

[0012] Measure and lay out the axis of the basement foundation, determine the location of the anchor holes and mark them accordingly;

[0013] After the anchor hole position is determined, the drilling rig can be moved to align with the hole position and drill;

[0014] Use high-pressure wind to drive the eccentric down-the-hole hammer to drill to the designed depth;

[0015] After the anchor hole is completed, the drill bit at the bottom of the hole sprays high-pressure gas to clean the hole;

[0016] Make anchor rods as required;

[0017] After the anchor hole is completed and cleaned, place the prepared anchor reinforcement and grouting pipe in the center of the hole;

[0018] After the copper reinforcement is lowered into the hole and fixed, fill 5~20mm graded gravel around the reinforcement to the hole mouth.

[0019] Pressure grouting through filling pipes;

[0020] 30 minutes after the second grouting is completed, check the grout surface and the installation of steel bars;

[0021] The anchor rod steel bars are bent and anchored into the waterproof board. The anchor rod steel bars are bent and the connection with the waterproof board is waterproofed.

[0022] Preferably, the pressure grouting through the filling pipe comprises the following steps:

[0023] Use the hole bottom grouting method and insert the grouting pipe to 30cm from the hole bottom;

[0024] Use a grouting machine to pass cement slurry into the grouting pipe and inject it into the bottom of the hole. The cement slurry fills the hole from the bottom of the hole to the outside and presses out the air and water in the hole.

[0025] From the first grouting to the slurry returning to the ground, observe for about 5 minutes. If the slurry in the hole is 10cm below the ground, a second pressure grouting should be carried out until the slurry stabilizes.

[0026] Beneficial Effects

[0027] The present invention provides an anti-floating anchor rod structure and an installation method thereof. The anti-floating anchor rod structure and the installation method thereof have the following beneficial effects: the anti-floating anchor rod structure and the installation method thereof change the traditional anti-floating anchor rod design concept, and increase the linkage between the anti-floating anchor rods by adding waterproof plates and cushion layers of different shapes, so that the anti-floating anchor rods that were originally subjected to independent forces are combined into a whole to be subjected to common forces, so that their stability after linkage is increased, and because the cushion layers and waterproof plates are designed in different shapes, they can be used to meet different construction needs, and in some specific cases, flanges can be welded on the main anchor rods, and some metal brackets can be quickly installed, which is convenient for people to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the present invention.

[0029] Figure 2 It is a schematic diagram of the cross-sectional structure at point A of the present invention viewed from above.

[0030] Figure 3 This is a structural diagram of embodiment 3 of the present invention.

[0031] Figure 4 This is a structural diagram of embodiment 4 of the present invention.

[0032] In the figure: 1. drilling; 2. pressure grouting; 3. cushion layer; 4. waterproof board; 5. grouting pipe; 6. isolation ring; 7. main anchor rod; 8. positioning bracket; 9. lower flange; 10. upper flange; 11. bolt; 12. first rubber ring; 13. second rubber ring. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] By those skilled in the art, the components in this case are connected in sequence. The specific connection and operation sequence should refer to the following working principle. The detailed connection means are well-known technologies in the field. The following mainly introduces the working principle and process.

[0035] See also Figure 1-3 The present invention provides a technical solution: an anti-floating anchor rod structure and an installation method thereof, comprising a ground and a borehole 1 opened on the ground, an anchor rod structure is inserted in the borehole 1, a pressure grout 2 is filled between the inner wall of the borehole 1 and the anchor rod structure, a cushion layer 3 is installed on the ground, a waterproof plate 4 is installed on the cushion layer 3, and the anchor rod structure passes through the waterproof plate 4 and the cushion layer 3 in sequence;

[0036] Specifically, the pressure grouting 2 adopts M30 cement slurry, and the unconfined compressive strength of the slurry material 28d should not be less than 30MPa;

[0037] Specifically, the main anchor rod 7 adopts the specification of HRB500, which is mainly used for shallow hills and gentle valleys.

[0038] Embodiment 1: The anchor structure comprises a grouting pipe 5, the grouting pipe 5 is inserted into the borehole 1, a plurality of isolating rings 6 are arranged on the outside of the grouting pipe 5, a plurality of main anchor rods 7 are arranged between the grouting pipe 5 and the isolating ring 6, the length of the main anchor rods 7 is approximately equal to the grouting pipe 5, the main anchor rods 7 are respectively in contact with the inner wall of the isolating ring 6 and the outer wall of the grouting pipe 5, a plurality of positioning brackets 8 are arranged between the outer wall of the isolating ring 6 and the inner wall of the borehole 1 and in the pressure grouting 2, and the front view shape of the positioning bracket 8 is a ship shape or an isosceles trapezoid;

[0039] Specifically, the main anchor rod 7 is in an "L" shape, and the boat-shaped positioning bracket 8 can further increase stability;

[0040] Specifically, the top bend of the main anchor rod 7 is embedded into the upper surface of the waterproof plate 4 as much as possible, and the top end of the grouting pipe 5 is flush with or slightly lower than the upper surface of the waterproof plate 4.

[0041] Embodiment 2: A lower flange 9 is installed on the main anchor rods 7, the grouting pipe passes through the lower flange 9, the lower flange 9 is embedded on the waterproof plate 4, the upper surface of the lower flange 9 is flush with the upper surface of the waterproof plate 4, an upper flange 10 is installed on the lower flange 9, and a plurality of bolts 11 are spirally installed between the upper flange 10 and the lower flange 9;

[0042] Specifically, the main anchor rod 7 at this time is in a straight line shape, and the upper flange 10 is mainly used for welding some metal frames, and then the upper flange 10 is aligned with the lower flange 9, and screwing in the screws is mainly used to facilitate the installation of metal frames and other items.

[0043] An annular groove is formed at the bottom of the upper flange 10, a first rubber ring 12 is installed on the lower flange 9, the first rubber ring 12 is engaged with the annular groove, a second rubber ring 13 is installed on the outer ring surface of the upper flange 10, and the second rubber ring 13 is in contact with the upper surface of the waterproof plate 4;

[0044] Specifically, the first rubber ring 12 and the second rubber ring 13 prevent moisture from entering the joint of the upper and lower flanges 9, which may cause rust over time. Of course, you can choose to spray anti-rust paint to replace the first rubber ring 12 or the second rubber ring 13.

[0045] Embodiment 3: The top view of the waterproof board 4 is in the shape of a letter "I", the cushion layer 3 has the same shape as the waterproof board 4, and the anchor rod structure is respectively inserted at the left and right ends of the waterproof board 4;

[0046] Specifically, this shape is generally designed with a slightly smaller stress point, which is convenient for installation, production and positioning.

[0047] Embodiment 4: The top view of the waterproof board 4 is in a "T" shape, the cushion layer 3 has the same shape as the waterproof board 4, and the anchor rod structures are respectively inserted at the triangular parts of the waterproof board 4;

[0048] Specifically, this shape is generally designed for a large stress point, and the shape of the waterproof plate 4 is not fixed, and can also be designed into a "cross" shape or a five-pointed star shape.

[0049] A method for installing an anti-floating anchor structure, using the anti-floating anchor structure according to any one of claims 1 to 6, comprising the following steps:

[0050] Measure and lay out the basement foundation axis, determine the anchor hole position and mark it accordingly;

[0051] Specifically, the hole position deviation is less than 50 mm.

[0052] After the anchor hole position is determined, the drilling rig can be moved to align with the hole position and drill;

[0053] Specifically, during the drilling process, the anchor position and verticality should be checked at any time according to the construction situation;

[0054] Furthermore, a Dongjian HXZ-90A anchor drilling rig was used to drive an eccentric down-the-hole hammer to drill to the designed depth with high-pressure wind power;

[0055] Specifically, the hole position is accurate, the hole is vertical, the hole diameter is 150mm or 160mm, the hole depth meets the design requirements and the hole depth is recorded in time;

[0056] After the anchor hole is completed, the drill bit at the bottom of the hole sprays high-pressure gas to clean the hole;

[0057] Make anchor rods as required;

[0058] Specifically, within the range of the anti-floating anchor rod, the main reinforcement is 3 25HRB400 or HRB500 grade threaded steel bars, which are cut according to the design requirements, placed side by side, and welded firmly to the centering bracket. The grouting pipe (20mm in the middle) is tied to the main steel bar, and the top and end of the grouting pipe are firmly wrapped with tape to prevent sand and gravel from clogging the grouting pipe. The grouting pipe port is 20~30cm away from the bottom of the hole.

[0059] After the anchor hole is completed and cleaned, place the prepared anchor reinforcement and grouting pipe in the center of the hole;

[0060] Specifically, it is required that the error should not exceed 10cm down to the designed depth.

[0061] After the copper reinforcement is lowered into the hole and fixed, fill 5~20mm graded gravel around the reinforcement to the hole mouth.

[0062] Pressure grouting through filling pipes;

[0063] 30 minutes after the second grouting is completed, check the grout surface and the installation of steel bars;

[0064] Specifically, if there is any abnormality, correct it immediately; if there is no abnormality, the anchor construction is completed.

[0065] Generally, acceptance inspection is carried out after the anchor grouting is completed and the strength reaches the specification requirements. The pull-out resistance test of the anti-floating anchor should be carried out by a qualified unit entrusted by Party A.

[0066] After the inspection is qualified, the project will be accepted and handed over to the underground construction unit.

[0067] According to the design requirements, the anchor rod steel bars are bent and anchored into the waterproof board. The anchor rod is anchored into the steel bars and the connection with the waterproof board is waterproofed.

[0068] The pressure grouting through the filling pipe comprises the following steps:

[0069] Use the hole bottom grouting method and insert the grouting pipe to 30cm from the hole bottom;

[0070] Use a grouting machine to pass cement slurry into the grouting pipe and inject it into the bottom of the hole. The cement slurry fills the hole from the bottom of the hole to the outside and presses out the air and water in the hole.

[0071] Specifically, the grouting material is cemented and the cement is PO42.5R ordinary Portland cement;

[0072] From the first grouting to the slurry returning to the ground, observe for about 5 minutes. If the slurry in the hole is 10cm below the ground, a second pressure grouting should be carried out until the slurry stabilizes.

[0073] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0074] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-floating anchor structure, comprising a ground surface and a borehole (1) opened on the ground surface, It is characterized in that An anchor rod structure is inserted into the borehole (1), and pressure grout (2) is filled between the inner wall of the borehole (1) and the anchor rod structure. A cushion layer (3) is installed on the ground, and a waterproof plate (4) is installed on the cushion layer (3). The anchor rod structure passes through the waterproof plate (4) and the cushion layer (3) in sequence. The anchor rod structure comprises a grouting pipe (5), the grouting pipe (5) is inserted into the borehole (1), a plurality of isolating rings (6) are arranged on the outside of the grouting pipe (5), a plurality of main anchor rods (7) are arranged between the grouting pipe (5) and the isolating rings (6), the length of the main anchor rods (7) being approximately equal to the length of the grouting pipe (5), the main anchor rods (7) being in contact with the inner wall of the isolating ring (6) and the outer wall of the grouting pipe (5) respectively, a plurality of positioning brackets (8) are arranged between the outer wall of the isolating ring (6) and the inner wall of the borehole (1) and located in the pressure grouting (2), the front view shape of the positioning brackets (8) being a ship shape or an isosceles trapezoid; A lower flange (9) is installed on the main anchor rods (7), the grouting pipe (5) passes through the lower flange (9), the lower flange (9) is embedded in the waterproof plate (4), the upper surface of the lower flange (9) is flush with the upper surface of the waterproof plate (4), an upper flange (10) is installed on the lower flange (9), and a plurality of bolts (11) are spirally installed between the upper flange (10) and the lower flange (9); The waterproof board (4) has a top view shape of an "I" shape, the cushion layer (3) has the same shape as the waterproof board (4), and the anchor rod structure is respectively inserted at the left and right ends of the waterproof board (4); or the waterproof board (4) has a top view shape of a "T" shape, the cushion layer (3) has the same shape as the waterproof board (4), and the anchor rod structure is respectively inserted at the three ends of the "T"-shaped structure of the waterproof board (4).

2. The anti-floating anchor structure according to claim 1, It is characterized in that An annular groove is formed at the bottom of the upper flange (10), a first rubber ring (12) is mounted on the lower flange (9), the first rubber ring (12) is engaged with the annular groove, a second rubber ring (13) is mounted on the outer ring surface of the upper flange (10), the second rubber ring (13) is in contact with the upper surface of the waterproof plate (4).

3. A method for installing an anti-floating anchor structure, It is characterized in that Using the anti-floating anchor structure according to any one of claims 1 to 2 comprises the following steps: Measure and lay out the basement foundation axis, determine the anchor hole position and mark it accordingly; After the anchor hole position is determined, the drilling rig can be moved to align with the hole position and drill; Use high-pressure wind to drive the eccentric down-the-hole hammer to drill to the designed depth; After the anchor hole is completed, the drill bit at the bottom of the hole sprays high-pressure gas to clean the hole; Make anchor rods as required; After the anchor hole is completed and cleaned, place the prepared anchor reinforcement and grouting pipe vertically in the center of the hole; After the steel bar is lowered into the hole and fixed, fill 5~20mm graded crushed stone around the steel bar to the hole mouth; Pressure grouting through grouting pipes; 30 minutes after the second grouting is completed, check the grout surface and steel bars; The anchor rod steel bars are bent and anchored into the waterproof board. The anchor rod steel bars are bent and the connection with the waterproof board is waterproofed.

4. The method for installing an anti-floating anchor structure according to claim 3, It is characterized in that The pressure grouting through the grouting pipe comprises the following steps: Use the hole bottom grouting method and insert the grouting pipe to 30cm from the hole bottom; Use a grouting machine to pass cement slurry into the grouting pipe and inject it into the bottom of the hole. The cement slurry fills the hole from the bottom of the hole to the outside and presses out the air and water in the hole. From the first grouting until the slurry returns to the ground, observe for about 5 minutes. If the slurry in the hole is 10 cm lower than the ground, a second pressure grouting should be carried out until the slurry is stable.

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