Stepped variable cross-section prestressed grouting anchor rod

Abstract

The utility model discloses a kind of stepped variable cross-section prestressed grouting anchor rod, it is related to fixed building technical field, including grouting anchor rod body, the surface welding installation of grouting anchor rod body has outer expansion support ring, the inside of outer expansion support ring is equipped with extension groove, the inner wall sliding installation of extension groove on outer expansion support ring has extension support plate, the stepped variable cross-section prestressed grouting anchor rod, outer expansion support ring can enhance the strength of prestressed grouting anchor rod body at variable cross-section by extension support plate, limiting slide is the limiting of the adjusting position of extension support plate inside outer expansion support ring, this mode not only guarantee that outer expansion support ring and grouting anchor rod body can be different formation stepped assembly positioning between, but also can realize outer expansion support ring place outer extension extension support plate to enhance the fixed strength of grouting anchor rod body, improve the drawbacks that traditional single grouting anchor rod body cannot be adapted to increase stepped outer expansion support ring to improve its strength and stress.

Description

Technical Field

[0001] This utility model relates to the field of fixed building technology, and in particular to a stepped variable cross-section prestressed grouting anchor. Background Technology

[0002] In slope reinforcement and foundation pit support projects, prestressed anchors are often used as support structures. In addition, with the continuous development and application of underground space, basements have become a standard feature of buildings, and anchors are increasingly being used in the anti-buoyancy design of underground structures.

[0003] In existing construction practices, most anchor bolts are straight anchor bolts. Their main structure usually includes an anchor head, anchor pipe, centering positioner, and connecting sleeve. Their pull-out resistance mainly comes from the friction between the grout and the surrounding soil and rock. However, during construction, there are inevitably situations where the grouting is insufficient. Therefore, when using straight anchor bolts, the strength of the variable cross-section prestress between them and the mortar cannot be increased, which will reduce the support capacity of the building. Therefore, there is an urgent need for a new type of stepped variable cross-section prestressed grouting anchor bolt. Utility Model Content

[0004] The purpose of this utility model is to solve at least one of the technical problems existing in the prior art, and to solve the problems raised in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a stepped variable cross-section prestressed grouting anchor bolt, comprising a grouting anchor bolt body, an outer expansion support ring welded to the surface of the grouting anchor bolt body, an extension groove formed on the inner side of the outer expansion support ring, an extension support plate slidably installed on the inner wall of the extension groove on the outer expansion support ring, a guide support ring threadedly installed on the inner side of the outer expansion support ring, and an extension support ball welded to the surface of the guide support ring.

[0006] Preferably, the contact area between the guide ring and the extension plate is a slope.

[0007] Preferably, a limiting groove is formed on the inner side of the outer expansion ring, and a limiting slide plate is slidably installed on the inner wall of the limiting groove of the outer expansion ring. The surface of the limiting slide plate is welded to the surface of the extension support plate.

[0008] Preferably, the inner side of the outer expansion ring is provided with a recessed groove, and a rubber ring is slidably installed on the inner wall of the recessed groove on the outer expansion ring.

[0009] Preferably, a bearing plate is slidably mounted on the surface of the grouting anchor body, and a positioning nut is threaded onto the surface of the grouting anchor body.

[0010] Preferably, the upper end of the grouting anchor body is provided with a grouting through hole, and the surface of the grouting anchor body is provided with a grouting through groove that communicates with the grouting through hole.

[0011] Preferably, an adhesive layer is bonded to the joint between the extended support plate and the outer expansion ring.

[0012] Compared with the prior art, the beneficial effects of this utility model are: (1) The stepped variable cross-section prestressed grouting anchor rod has an extended support plate that can enhance the strength of the prestress of the grouting anchor rod body at the variable cross-section. The limiting slide plate limits the position of the extended support plate inside the extended support ring. This method not only ensures that the extended support ring and the grouting anchor rod body can be assembled and positioned in different stepped manner, but also enables the extended support plate at the extended support ring to enhance the fixing strength of the grouting anchor rod body. This improves the shortcomings of the traditional single grouting anchor rod body, which cannot be adapted to the addition of a stepped extended support ring to improve its strength and stress. It also improves the strength performance of the grouting anchor rod body when in use, making it more reliable and efficient.

[0013] (2) The stepped variable cross section prestressed grouting anchor rod achieves the pre-positioning effect of the outer expansion ring and the grouting anchor rod body by means of the frictional resistance between the rubber ring and the grouting anchor rod body, which facilitates subsequent welding, installation and fixing, thereby ensuring the ease of welding and installation of the outer expansion ring at the matching position of the grouting anchor rod body. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of a stepped variable cross-section prestressed grouting anchor rod according to the present invention; Figure 2 This is a schematic diagram of the structure of the external expansion ring of this utility model; Figure 3 This is a schematic diagram of the planar structure of the externally expanding support ring of this utility model; Figure 4 This utility model Figure 1 A magnified structural diagram of point A in the middle.

[0015] Reference numerals in the attached drawings: 1. Grouting anchor body; 2. Grouting through hole; 3. Grouting through groove; 4. Bearing support plate; 5. Positioning nut; 6. Outward expansion support ring; 7. Extension groove; 8. Extension support plate; 9. Adhesive layer; 10. Guide support ring; 11. Outward extension ball; 12. Limiting groove; 13. Limiting slide plate; 14. Inward recessed groove; 15. Rubber ring. Detailed Implementation

[0016] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0017] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0019] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0020] Please see Figure 1-4 This utility model provides a technical solution: a stepped variable cross-section prestressed grouting anchor rod, including a grouting anchor rod body 1, a grouting through hole 2 at the upper end of the grouting anchor rod body 1, and a grouting through groove 3 communicating with the grouting through hole 2 on the surface of the grouting anchor rod body 1. The function of the grouting through hole 2 and the grouting through groove 3 on the grouting anchor rod body 1 is to guide and expand the grouting sand.

[0021] Furthermore, a bearing plate 4 is slidably installed on the surface of the grouting anchor body 1, and a positioning nut 5 is threaded on the surface of the grouting anchor body 1. The function of the positioning nut 5 is to position and fix the bearing plate 4.

[0022] Furthermore, an outer expansion ring 6 is welded and installed on the surface of the grouting anchor body 1. An inner groove 14 is provided on the inner side of the outer expansion ring 6. A rubber ring 15 is slidably installed on the inner wall of the inner groove 14 on the outer expansion ring 6. By setting the rubber ring 15 on the outer expansion ring 6, the outer expansion ring 6 can have a sliding adjustment and limiting effect when installed on the surface of the grouting anchor body 1. Then, the frictional resistance between the rubber ring 15 and the grouting anchor body 1 can achieve the pre-positioning effect between the outer expansion ring 6 and the grouting anchor body 1, which facilitates subsequent welding, installation and fixing. This ensures the ease of welding and installation of the outer expansion ring 6 at the fitting point on the grouting anchor body 1.

[0023] Furthermore, an extension groove 7 is provided on the inner side of the outer expansion support ring 6, and an extension support plate 8 is slidably installed on the inner wall of the extension groove 7 on the outer expansion support ring 6. An adhesive layer 9 is bonded to the abutment of the extension support plate 8 and the outer expansion support ring 6. When the extension support plate 8 is installed at the extension groove 7 on the outer expansion support ring 6, the adhesive layer 9 is used for positioning, which facilitates the subsequent adjustment and pushing of the extension support plate 8 for extension.

[0024] Furthermore, a guide ring 10 is threaded onto the inner side of the outer expansion ring 6, and an extended support ball 11 is welded onto the surface of the guide ring 10. A limiting groove 12 is formed on the inner side of the outer expansion ring 6, and a limiting slide plate 13 is slidably installed on the inner wall of the upper limit groove 12 of the outer expansion ring 6. The surface of the limiting slide plate 13 is welded onto the surface of the extension support plate 8. The abutment of the guide ring 10 and the extension support plate 8 is a slope. After the outer expansion ring 6 reaches the predetermined position at the grouting anchor body 1 and is welded, the operator controls the guide ring 10 to move inside the outer expansion ring 6 by controlling the extended support ball 11. Therefore, the guide ring 10 pushes the slope of the extension support plate 8 through its own slope, causing it to slide out inside the outer expansion ring 6. The adhesive layer 9 between the extension support plate 8 and the outer expansion ring 6 has adhesive ability but is not very strong. 8 will break and no longer adhere when subjected to external force. The adhesive layer 9 is an existing structure and will not be described in detail here. When the extension plate 8 extends to its maximum position inside the outer expansion ring 6, the outer expansion ring 6 can enhance the strength of the prestress of the grouting anchor body 1 at the variable cross section through the extension plate 8. The limiting slide plate 13 limits the position adjustment of the extension plate 8 inside the outer expansion ring 6. This method not only ensures that the outer expansion ring 6 and the grouting anchor body 1 can be assembled and positioned in different stepped manner, but also realizes that the extension plate 8 at the outer expansion ring 6 can enhance the fixing strength of the grouting anchor body 1. It improves the shortcomings of the traditional single grouting anchor body 1, which cannot be adapted to the addition of the stepped outer expansion ring 6 to improve its strength and stress, and improves the grouting anchor body 1 to have more reliable and efficient strength performance when in use.

[0025] Working principle: A stepped variable cross-section prestressed grouting anchor rod is welded to a predetermined position at the grouting anchor rod body 1 by the outer expansion support ring 6. The operator controls the guide support ring 10 to move inside the outer expansion support ring 6 by controlling the outer extension support ball 11. Therefore, the guide support ring 10 pushes the slope of the extension support plate 8 through its own slope, causing it to slide out inside the outer expansion support ring 6. When the extension support plate 8 extends to the maximum position inside the outer expansion support ring 6, the outer expansion support ring 6 can enhance the strength of the prestress at the variable cross-section of the grouting anchor rod body 1 through the extension support plate 8. The limiting slide plate 13 limits the adjustment position of the extension support plate 8 inside the outer expansion support ring 6.

[0026] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A stepped variable cross-section prestressed grouting anchor bolt, comprising a grouting anchor bolt body (1), characterized in that: The surface of the grouting anchor body (1) is welded with an outer expansion ring (6), an extension groove (7) is provided on the inner side of the outer expansion ring (6), an extension support plate (8) is slidably installed on the inner wall of the extension groove (7) on the outer expansion ring (6), a guide support ring (10) is threaded on the inner side of the outer expansion ring (6), and an extension support ball (11) is welded on the surface of the guide support ring (10).

2. The stepped variable cross-section prestressed grouting anchor bolt according to claim 1, characterized in that: The guide ring (10) and the extension plate (8) are both sloped at their contact points.

3. A stepped variable cross-section prestressed grouting anchor bolt according to claim 1, characterized in that: The inner side of the outer expansion ring (6) is provided with a limiting groove (12), and the inner wall of the upper limiting groove (12) of the outer expansion ring (6) is slidably installed with a limiting slide plate (13), and the surface of the limiting slide plate (13) is welded to the surface of the extension support plate (8).

4. A stepped variable cross-section prestressed grouting anchor bolt according to claim 1, characterized in that: The inner side of the outer expansion ring (6) is provided with an inner groove (14), and a rubber ring (15) is slidably installed on the inner wall of the inner groove (14) on the outer expansion ring (6).

5. A stepped variable cross-section prestressed grouting anchor bolt according to claim 1, characterized in that: The surface of the grouting anchor body (1) is slidably mounted with a bearing plate (4), and the surface of the grouting anchor body (1) is threadedly mounted with a positioning nut (5).

6. A stepped variable cross-section prestressed grouting anchor bolt according to claim 1, characterized in that: The upper end of the grouting anchor body (1) is provided with a grouting through hole (2), and the surface of the grouting anchor body (1) is provided with a grouting through groove (3) that communicates with the grouting through hole (2).

7. A stepped variable cross-section prestressed grouting anchor bolt according to claim 1, characterized in that: An adhesive layer (9) is bonded to the joint between the extension support plate (8) and the outer expansion support ring (6).

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