Anti-floating anchor rod structure with high anchoring force

Abstract

The invention provides an anti-floating anchor rod structure with high anchoring force. Comprising an anchor rod steel bar, a positioner, a limiting sleeve, a group limiting casing pipe and a concrete grouting layer, the anchor rod steel bars extend into the bottom of the anchor hole in the axial direction of the anchor hole, the positioners are arranged at intervals in the axial direction of the anchor hole, and the positioners are fixedly connected with the anchor rod steel bars; the multiple sets of limiting sleeves and the multiple limiting sleeves are sequentially arranged at intervals in the axial direction of the anchor hole, the limiting sleeves are arranged on the outer sides of the corresponding anchor rod steel bars, the limiting sleeves are fixedly connected with the corresponding anchor rod steel bars, all the anchor rod steel bars are sleeved with the limiting sleeves, and the inner walls of the limiting sleeves are fixedly connected with the anchor rod steel bars. And the anchor hole is filled with the concrete grouting layer. When the tensile force of the anchor rod reinforcing steel bar is large, the limiting sleeve and the limiting sleeve can generate inward or outward deformation, the inward deformation steel pipe wall can partially provide end resistance and partially provide friction force instead of providing friction force, and the outward deformation steel pipe wall, the limiting sleeve and the limiting sleeve provide large resistance by being wedged into the concrete grouting layer.

Description

Technical Field

[0001] The invention belongs to the technical field of anti - floating technology for underground structures, and particularly relates to a high - anchoring - force anti - floating anchor rod with nested slotted steel pipes. Background Technique

[0002] To counter the adverse effects of groundwater buoyancy on underground structures, anti - floating anchor rods are usually set at the bottom of underground structures to offset the influence of water buoyancy and ensure that the underground structures do not float or crack during construction and use.

[0003] Common anti - floating anchor rods are composed of multiple steel bars, positioners and cement mortar. When the underground structure is subjected to an upward buoyancy force, the anchoring force between the cement mortar and the soil layer and the axial tension of the steel bars can ensure that the underground structure does not float. However, in the application process, it is found that sometimes there are no problems with the aforementioned anchoring force and tension, but the bonding force between the steel bars and the cement mortar in the anti - floating anchor rod is insufficient, resulting in their separation, and thus the anti - floating anchor rod cannot play the expected role.

[0004] The patent with the application number CN202210101896.7 discloses an end - bearing anti - floating anchor rod, which mainly consists of a bearing body, an end cover, a pedestal and a tensile member. The pedestal includes a main body part that can be fixed inside the bearing body and a flange part that abuts against the front end of the bearing body. The tensile member passes through the bearing body and is connected to the main body part of the pedestal, and the end cover is fastened on the pedestal.

[0005] However, the above - mentioned patent does not solve the technical problems existing in the prior art and cannot meet the requirement of providing high anchoring force for anti - floating anchor rods. Therefore, there is an urgent need in engineering for an anti - floating anchor rod structure that combines economy and construction convenience and can effectively improve the bonding and anchoring effect between steel bars and cement mortar. Summary of the Invention

[0006] The purpose of the present invention is to provide a high - anchoring - force anti - floating anchor rod structure to solve the problems raised in the above - mentioned background technique:

[0007] (1) How to greatly improve the anchoring force between the anchor rod steel bars and the cement mortar after the anchor rod is stressed and deformed.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] A high - anchoring - force anti - floating anchor rod structure;

[0010] It includes a number of anchor rod steel bars, a number of positioners, a number of limiting sleeves, a number of groups of limiting sleeves and a concrete grouting layer;

[0011] A number of anchor bar steels extend into the bottom of the anchor hole along the axial direction of the anchor hole. A number of positioners are arranged at intervals in sequence along the axial direction of the anchor hole. The positioners are fixedly connected to the number of anchor bar steels.

[0012] A number of groups of limit sleeves are arranged at intervals in sequence along the axial direction of the anchor hole. The limit sleeves of the same group correspond to the number of anchor bar steels one by one. The limit sleeves are outside the corresponding anchor bar steels, and the limit sleeves are fixedly connected to the corresponding anchor bar steels.

[0013] A number of limit sleeves are arranged at intervals in sequence along the axial direction of the anchor hole. The limit sleeves are sleeved outside all the anchor bar steels. The inner wall of the limit sleeves is fixedly connected to the anchor bar steels.

[0014] The concrete grouting layer fills the anchor hole completely.

[0015] On the basis of the above technical solution, the present invention can also be improved as follows.

[0016] Further, a number of positioning holes corresponding to the anchor bar steels are opened in the positioners. The number of positioning holes cooperate with the number of anchor bar steels respectively, and the anchor bar steels are fixedly connected to the hole walls of the positioning holes.

[0017] Further, the limit sleeves are made of fully open-seamed steel pipes; the limit sleeves are made of end-open-seamed steel pipes, and the limit sleeves are connected to the anchor bar steels by double-sided welding.

[0018] Further, the limit sleeves are selected from fully open-seamed steel pipes with specifications of DN32 to DN40. The length of each limit sleeve is 200 mm to 300 mm, and all the limit sleeves are arranged at intervals of 1 m along the axial direction of the anchor hole.

[0019] Further, the limit sleeves are selected from end-open-seamed steel pipes with a specification of DN100, with a length of 300 mm to 400 mm. The length of the slotted section on the limit sleeves accounts for 20% to 30% of their axial length, and all the limit sleeves are arranged at intervals of 1 m along the axial direction of the anchor hole.

[0020] Further, the anchor bar steels are selected from HRB400 grade hot-rolled ribbed steel bars with a diameter of 22 mm to 28 mm.

[0021] Further, all the limit sleeves and all the groups of limit sleeves are arranged alternately, and a spacing of 0.4 to 0.6 m is maintained between them.

[0022] Further, the mixing ratio of the cement mortar used in the concrete grouting layer is controlled at cement:sand:lime = 1:2.5 to 3.5:0.4 to 0.6, and the water-cement ratio is controlled at 0.3 to 0.45.

[0023] After adopting such a structure, since the anchor bar steel bars, the limit sleeves, and the limit sockets are completely wrapped by the concrete grouting layer, when the tensile force of the anchor bar steel bars is large, the limit sleeves and the limit sockets will deform inward or outward. When deforming inward, the steel pipe wall will change from providing frictional force to partially providing end resistance and partially providing frictional force. When deforming outward, the limit sleeves and the limit sockets will provide a large resistance by wedging into the concrete grouting layer. Therefore, regardless of the deformation, the anchoring force between the anchor bar steel bars and the concrete grouting layer can be greatly improved, ensuring the anti-floating anchor bar to play its role, and the construction is simple and the components are economically viable. Brief Description of the Drawings

[0024] Figure 1 is the usage state diagram of the embodiment of the high-anchoring-force anti-floating anchor bar structure.

[0025] Figure 2 is the partial structure schematic diagram of the embodiment of the high-anchoring-force anti-floating anchor bar structure.

[0026] Figure 3 is Figure 2 the sectional view along the A-A direction.

[0027] Figure 4 is Figure 2 the sectional view along the B-B direction.

[0028] Explanation of the reference numerals in the figures:

[0029] Anchor bar steel bars - 100; Positioner - 200; Limit sleeve - 300; Limit socket - 400; Double-sided weld - 600; Concrete grouting layer - 500. Detailed Embodiment

[0030] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the detailed embodiments of the present invention in conjunction with the drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0031] The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and do not represent the only implementation manner.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0033] Please refer to Figures 1 to 4 。

[0034] The high-anchoring-force anti-floating anchor structure includes three anchor bar steels 100, multiple positioners 200, multiple limit sleeves 400, multiple groups of limit tubes 300, and a concrete grouting layer 500.

[0035] The three anchor bar steels 100 extend into the bottom of the anchor hole along the axial direction of the anchor hole. The multiple positioners 200 are arranged at intervals in sequence along the axial direction of the anchor hole. The positioners 200 are made of ordinary cast iron. The positioners 200 are provided with three positioning holes corresponding to the anchor bar steels 100. The three positioning holes are respectively matched with the three anchor bar steels 100, and the anchor bar steels 100 are fixedly connected with the hole walls of the positioning holes. The anchor bar steels 100 are HRB400 grade hot-rolled ribbed steels with a diameter of 25 mm.

[0036] The multiple groups of limit tubes 300 are arranged at intervals in sequence along the axial direction of the anchor hole. The limit tubes 300 in the same group are at the same horizontal height. The three limit tubes 300 in the same group correspond to the three anchor bar steels 100 one by one. The limit tubes 300 are on the outside of the corresponding anchor bar steels 100. The limit tubes 300 are made of fully open-seamed steel pipes. The limit tubes 300 are tightly clamped transversely to close the seams and are closely attached to the anchor bar steels 100.

[0037] The limit tubes 300 are DN32 welded steel pipes with a length of 200 mm and are seamed along the entire longitudinal length. All the limit tubes 300 are arranged at intervals of 1 m along the axial direction of the anchor hole.

[0038] The multiple limit sleeves 400 are arranged at intervals in sequence along the axial direction of the anchor hole. The limit sleeves 400 are sleeved on the outside of all the anchor bar steels 100. The limit sleeves 400 are made of end-seamed steel pipes. The limit sleeves 400 are connected to the anchor bar steels 100 by double-sided welding.

[0039] The limit sleeves 400 are DN125 welded steel pipes with a length of 300 mm and are seamed on the side wall of the upper end. The longitudinal seam is 60 mm. The length of the seamed section on the limit sleeves 400 accounts for 20% of its axial length. All the limit sleeves 400 are arranged at intervals of 1 m along the axial direction of the anchor hole.

[0040] All the limit sleeves 400 and all the groups of limit casing pipes 300 are arranged alternately, and a spacing of 0.5 m is maintained between the two.

[0041] The concrete grouting layer 500 fills the anchor holes completely, and the concrete grouting layer 500 is bonded to the formation by pouring cement mortar. The cement mortar used in the concrete grouting layer 500 is made by mixing ordinary Portland cement, sand, and slaked lime with water, and the mix ratio is 1:3:0.5, and the water-cement ratio is 0.35.

[0042] After the construction is completed and put into use, the anchor bar steel 100 is in tension. Since the anchor bar steel 100, the limit casing pipe 300, and the limit sleeve 400 are completely wrapped by the concrete grouting layer 500, when the tension of the anchor bar steel 100 is large, the limit casing pipe 300 and the limit sleeve 400 will deform inward or outward. When deforming inward, the steel pipe wall will change from providing frictional force to partly providing end resistance and partly providing frictional force. When deforming outward, the limit casing pipe 300 and the limit sleeve 400 provide greater resistance by wedging into the concrete grouting layer 500. Therefore, no matter how the deformation is, the anchoring force between the anchor bar steel 100 and the concrete grouting layer 500 can be greatly improved, ensuring the anti-floating anchor bar to play its role, and the construction is simple and the components have good economy.

[0043] The above is only one implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several variations and improvements can be made, and these should also be regarded as belonging to the protection scope of the present invention.

Claims

1. A high anchoring force anti-floating anchor structure, characterized by: It comprises a plurality of anchor steel bars (100), a plurality of positioners (200), a plurality of limiting sleeves (400), a plurality of groups of limiting sleeves (300) and a concrete grouting layer (500); A plurality of anchor rod reinforcement bars (100) extend into the bottom of the anchor hole along the axial direction of the anchor hole, a plurality of positioners (200) are sequentially arranged at intervals along the axial direction of the anchor hole, and the positioners (200) are fixedly connected to the plurality of anchor rod reinforcement bars (100); A plurality of groups of limiting sleeves (300) are sequentially arranged at intervals along the axial direction of the anchor hole, and the limiting sleeves (300) of the same group correspond to a plurality of anchor bars (100) one by one, and the limiting sleeves (300) are located outside the corresponding anchor bars (100), and the limiting sleeves (300) are fixedly connected to the corresponding anchor bars (100); A plurality of limiting sleeves (400) are sequentially spaced apart in the axial direction of the anchor hole, the limiting sleeves (400) are sleeved on the outside of all anchor rod reinforcements (100), and the inner wall of the limiting sleeves (400) is fixedly connected to the anchor rod reinforcement (100); The concrete grouting layer (500) completely fills the anchor hole.

2. The high anchoring force anti-floating anchor structure according to claim 1 is characterized in that: The positioner (200) is provided with a plurality of positioning holes corresponding to the anchor bars (100), the plurality of positioning holes are respectively matched with the plurality of anchor bars (100), and the anchor bars (100) are fixedly connected to the wall of the positioning holes.

3. The high anchoring force anti-floating anchor structure according to claim 1 is characterized in that: The limiting sleeve (300) is a fully slit steel pipe; the limiting sleeve (400) is a steel pipe with end slits, and the limiting sleeve (400) is connected to the anchor steel bar (100) by double-sided welding.

4. The high anchoring force anti-floating anchor structure according to claim 3 is characterized by: The limiting sleeve (300) is a fully-opened steel pipe with a specification of DN32 to DN40. Each limiting sleeve (300) is 200 mm to 300 mm long. All the limiting sleeves (300) are arranged at intervals of 1 m along the axial direction of the anchor hole.

5. The high anchoring force anti-floating anchor structure according to claim 3 is characterized by: The limiting sleeve (400) is a DN100 end slit steel pipe with a length of 300 mm to 400 mm. The length of the slit section on the limiting sleeve (400) accounts for 20% to 30% of its axial length. All limiting sleeves (400) are arranged at intervals of 1 m along the axial direction of the anchor hole.

6. The high anchoring force anti-floating anchor structure according to claim 1 is characterized by: The anchor bar steel bar (100) is made of HRB400 grade hot-rolled threaded steel bar with a diameter of 22 mm to 28 mm.

7. The high anchoring force anti-floating anchor structure according to claim 1 is characterized by: All the limiting sleeves (400) and all the groups of limiting sleeves (300) are arranged alternately, and a distance of 0.4 to 0.6 m is maintained between the two.

8. The high anchoring force anti-floating anchor structure according to claim 1 is characterized by: The cement mortar ratio used in the concrete grouting layer (500) is controlled at cement: sand: lime = 1: 2.5-3.5: 0.4-0.6, and the water-cement ratio is controlled at 0.3-0.45.

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