Anchor rod component

Abstract

The utility model relates to an anchor rod component. The anchor rod component comprises a fixing part, a plurality of first anchor rod bodies and a plurality of second anchor rod bodies. One end of each first anchor rod body is inserted into the first side, away from the ground, of the fixing part in the vertical axis direction of the fixing part. One ends of the second anchor rod bodies are obliquely inserted into the first side, away from the ground, of the fixing part at a preset angle, and the extending direction of the other end of each second anchor rod body does not intersect with the extending direction of the other end of any first anchor rod body. By adopting the anchor rod component, the construction stability of a project can be improved.

Description

Technical Field

[0001] This application relates to the field of foundation pit support technology, and in particular to an anchor bolt component. Background Technology

[0002] In modern society, with the increasing human production activities, disasters related to rock and soil have become more frequent and severe. Examples include large landslides, debris flows, tunnel collapses, extreme deformation of tunnels (rock bursts, roof collapses, floor heaves), and earthquakes.

[0003] Because soil and rock masses are heterogeneous and discontinuous media, their strength and deformation are greatly affected by external conditions. Under load, they are prone to nonlinear large deformation problems. Therefore, anchor bolts are generally required when constructing on soil and rock masses. Currently, the individual anchor bolts in the anchor bolt assembly are arranged vertically downwards from the soil and rock mass. This arrangement of anchor bolt components facilitates construction and can directly transfer the load of the superstructure to the deep, stable strata.

[0004] However, traditional anchor bolt components suffer from poor construction stability. Summary of the Invention

[0005] Therefore, it is necessary to provide an anchor bolt component that can improve construction stability in response to the above-mentioned technical problems.

[0006] In a first aspect, this application provides an anchor bolt component, comprising: a fixing component, a plurality of first anchor bolt bodies, and a plurality of second anchor bolt bodies;

[0007] In this configuration, one end of each of the first anchor rods is inserted along the vertical axis of the fixing component on the first side of the fixing component away from the ground; one end of each of the second anchor rods is inserted at a preset angle on the first side of the fixing component away from the ground, and the extension direction of the other end of each second anchor rod does not intersect with the extension direction of the other end of any first anchor rod.

[0008] In one embodiment, the anchor member further includes a support member, which is fixed to the second side of the fixing member near the ground; the support member is used to support the external member.

[0009] In one embodiment, the length of the second anchor body is not less than the length of the first anchor body.

[0010] In one embodiment, the length of the first anchor body is in the range of 3-5 meters or 8-10 meters; the length of the second anchor body is in the range of 3-5 meters or 8-10 meters.

[0011] In one embodiment, the first anchor body is cylindrical, the second anchor body is cylindrical, and the diameter of the second anchor body is not less than the diameter of the first anchor body.

[0012] In one embodiment, the diameter of the first anchor body is in the range of 20 mm to 30 mm, or in the range of 40 mm to 50 mm; the diameter of the second anchor body is in the range of 20 mm to 30 mm, or in the range of 40 mm to 50 mm.

[0013] In one embodiment, the anchor bolt component further includes a first set and a second set;

[0014] The first sleeve is fitted outside the first anchor rod body and is located at the insertion position between the first anchor rod body and the fixing component, and the ratio between the length of the first sleeve and the length of the first anchor rod body is in the range of 1 / 4 to 1 / 3;

[0015] The second sleeve is fitted outside the second anchor body and is located at the insertion position between the second anchor body and the fixing component. The ratio between the length of the second sleeve and the length of the second anchor body is in the range of 1 / 4 to 1 / 3.

[0016] In one embodiment, the cross-sectional area of ​​the first body decreases along the direction in which the first body extends away from the fixing component; the cross-sectional area of ​​the second body decreases along the direction in which the second body extends away from the fixing component.

[0017] In one embodiment, the tilt angle of the second anchor body is in the range of 10 degrees to 30 degrees.

[0018] In one embodiment, the first anchor body includes a fixed rod body and a movable rod body; one end of the fixed rod body is inserted into the first side of the fixed component away from the ground along the vertical axis of the fixed component, and the other end of the fixed rod body is connected to one end of the movable rod body, and the other end of the movable rod body is tilted and rotated relative to the fixed rod body at a preset angle to a preset position; the length of the fixed rod body is in the range of 0.5 meters to 2 meters.

[0019] The aforementioned anchor bolt components, through their inclined anchor bodies, alter the single force-bearing mode of traditional vertical anchor bolts. In soil or rock, the inclined anchor bodies can better utilize the inherent resistance of the soil and rock, decomposing the anchoring force into vertical and horizontal components. The vertical component helps increase the friction between the anchor bolt and the soil and rock, improving the anchor bolt's pull-out resistance, while the horizontal component directly resists the horizontal displacement tendency of the soil and rock, effectively preventing lateral sliding of the soil in slope engineering, thereby further improving the construction stability of the project. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a structural schematic diagram of an anchor bolt component in one embodiment;

[0022] Figure 2 This is a structural schematic diagram of the anchor bolt component in another embodiment;

[0023] Figure 3 This is a structural schematic diagram of an anchor bolt component in one embodiment. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0025] In modern society, with the increasing human production activities, disasters related to rock and soil have become more frequent and severe. Examples include large landslides, debris flows, tunnel collapses, extreme deformation of tunnels (rock bursts, roof collapses, floor heaves), and earthquakes.

[0026] Because soil and rock masses are heterogeneous and discontinuous media, their strength and deformation are greatly affected by external conditions. Under load, they are prone to nonlinear large deformation problems. Therefore, anchor bolts are generally required when constructing on soil and rock masses. Currently, the individual anchor bolts in the anchor bolt assembly are arranged vertically downwards from the soil and rock mass. This arrangement of anchor bolt components facilitates construction and can directly transfer the load of the superstructure to the deep, stable strata.

[0027] However, traditional anchor bolt components suffer from poor construction stability. This application provides a novel anchor bolt component designed to solve the problem of poor construction stability during construction.

[0028] In one embodiment, see Figure 1 An anchor bolt component 01 is provided, comprising: a fixing component 10, a plurality of first anchor bolt bodies 20 and a plurality of second anchor bolt bodies 30;

[0029] In this configuration, one end of a plurality of first anchor rods 20 is inserted along the vertical axis of the fixing component 10 on the first side of the fixing component 10 away from the ground; one end of a plurality of second anchor rods 30 is inserted at a preset angle on the first side of the fixing component 10 away from the ground, and the extension direction of the other end of each second anchor rod 30 does not intersect with the extension direction of the other end of any first anchor rod 20.

[0030] It should be noted that, apart from some of the fixing parts 10 which are exposed above the ground, the other parts of the anchor bolt component 01 (the remaining fixing parts 10, the multiple first anchor bolt bodies 20 and the multiple second anchor bolt bodies 30) are all located in the soil layer or rock layer below the ground, or both.

[0031] Optionally, one end of a plurality of first anchor bolts 20 may be evenly and periodically inserted along the vertical axis of the fixing component 10 on the first side of the fixing component 10 away from the ground, or may be randomly inserted along the vertical axis of the fixing component 10 on the first side of the fixing component 10 away from the ground.

[0032] Optionally, one end of a plurality of second anchor rods 30 may be evenly and periodically inserted at a preset angle into the first side of the fixing component 10 away from the ground, or may be randomly inserted at a preset angle into the first side of the fixing component 10 away from the ground.

[0033] Optionally, the inclined extension direction of the second anchor body 30 can be as shown in the reference. Figure 1 As shown, the second anchor bolt 30 can be inclined downwards to the left, but it can also be inclined downwards to the right, downwards to the rear, or downwards to the front. It should be noted that it is only necessary to ensure that the extension direction of the other end of each second anchor bolt does not intersect with the extension direction of the other end of any first anchor bolt. This embodiment does not impose any restrictions on the specific extension direction of the other end of the second anchor bolt.

[0034] In this embodiment, a novel anchor bolt component is provided, wherein the inclined anchor bolt body can change the single force-bearing mode of the traditional vertical anchor bolt body. In soil or rock, the inclined anchor bolt body can better utilize the self-resistance of the soil and rock mass, decomposing the anchoring force into vertical and horizontal components. The vertical component helps to increase the friction between the anchor bolt and the soil and rock mass, improving the pull-out resistance of the anchor bolt. The horizontal component can directly resist the horizontal displacement tendency of the soil and rock mass, such as effectively blocking the lateral sliding of the soil in slope engineering, thereby further improving the construction stability of the project.

[0035] In one embodiment, see Figure 2The aforementioned anchor bolt component 01 further includes a support component 40, which is fixed to the second side of the fixing component 10 near the ground and is used to support the external component.

[0036] External components include bridges and tunnels.

[0037] In this embodiment of the application, part of the support member 40 is exposed above the ground. The support member 40 exposed above the ground is connected to the external component. The other part of the support member 40 is inserted into the soil layer or rock layer below the ground, or is located in both the soil layer and the rock layer.

[0038] The anchor bolt component provided in this embodiment connects the anchor bolt component to the external component through a support component. The anchor bolt component has strong stability when inserted into the ground, thereby firmly gripping the external component into the ground and enhancing the stability of the external component.

[0039] In one embodiment, the lengths of the first anchor body 20 and the second anchor body 30 in the anchor member 01 can also be limited, that is, the length of the second anchor body is not less than the length of the first anchor body. In other words, the length of the second anchor body is equal to the length of the first anchor body, or the length of the second anchor body is greater than the length of the first anchor body.

[0040] In this embodiment, by limiting the lengths of the first anchor rod and the second anchor rod, the length of the second anchor rod is made greater than the length of the first anchor rod, thereby improving the stability of the anchor rod component at the angle of force application.

[0041] In one embodiment, the lengths of the first anchor body 20 and the second anchor body 30 in the anchor member 01 may be further limited. The length of the first anchor body 20 is in the range of 3 meters to 5 meters, or in the range of 8 meters to 10 meters; the length of the second anchor body 30 is in the range of 3 meters to 5 meters, or in the range of 8 meters to 10 meters.

[0042] In this embodiment, the length of the anchor bolt can be set according to different engineering application scenarios, and the length of the anchor bolt is generally in the range of 3-10 meters. For example, in general small slope reinforcement projects, the length of the anchor bolt may be 3-5 meters, while in large geotechnical engineering projects or deep foundation pit support projects, the length of the anchor bolt may reach 8-10 meters.

[0043] In this embodiment, by limiting the lengths of the first and second anchor bolts under different construction conditions, the anchor bolts can adapt to different conditions, thereby improving construction safety under different construction conditions.

[0044] In one embodiment, the shapes of the first anchor body 20 and the second anchor body 30 in the anchor member 01 can also be restricted, that is, the first anchor body 20 is cylindrical, the second anchor body 30 is cylindrical, and the diameter of the second anchor body 30 is not less than the diameter of the first anchor body 20.

[0045] In this embodiment, by restricting the shape of the first anchor body and the shape of the second anchor body, the diameter of the second anchor body is made larger than the diameter of the first anchor body, thereby improving the stability of the anchor component at the angle of force applied to the anchor.

[0046] In one embodiment, the diameters of the first anchor body 20 and the second anchor body 30 in the anchor member 01 may be further limited, wherein the diameter of the first anchor body 20 is in the range of 20 mm to 30 mm or in the range of 40 mm to 50 mm; and the diameter of the second anchor body 30 is in the range of 20 mm to 30 mm or in the range of 40 mm to 50 mm.

[0047] In this embodiment, the diameter of the anchor rod can be set according to different engineering application scenarios, and the diameter of the anchor rod is generally in the range of 20-50 mm. For example, for anchor rods that bear relatively small tensile forces, such as in shallow anchoring conditions with relatively stable soil, the diameter of the anchor rod may be 20-30 mm, while in cases that require bearing larger tensile forces, such as in rock anchoring conditions or high-stress soil reinforcement conditions, the diameter of the anchor rod may be 40-50 mm.

[0048] In this embodiment, by limiting the diameters of the first and second anchor bolts under different construction conditions, the anchor bolts can adapt to different conditions, thereby improving construction safety under different construction conditions.

[0049] In one embodiment, the anchor bolt component 01 can be further described, and the anchor bolt component 01 also includes a first body 50 and a second body 60;

[0050] See Figure 3 The first sleeve 50 is sleeved outside the first anchor rod body 20 and is located at the insertion position between the first anchor rod body 20 and the fixing component 10, and the ratio between the length of the first sleeve 50 and the length of the first anchor rod body 20 is in the range of 1 / 4 to 1 / 3.

[0051] The second sleeve 60 is fitted outside the second anchor rod body 30 and is located at the insertion position between the second anchor rod body 30 and the fixing component 10. The ratio between the length of the second sleeve 60 and the length of the second anchor rod body 30 is in the range of 1 / 4 to 1 / 3.

[0052] For example, for a 6-meter-long anchor rod, the length of the sleeve (including the first sleeve 50 and the second sleeve 60, i.e. the variable cross-section section set in the anchor rod) may be around 1.5-2 meters.

[0053] Furthermore, the first set 50 and the second set 60 can be further described. The cross-sectional area of ​​the first set 50 decreases along the extension direction of the first set 50 away from the fixing component 10; the cross-sectional area of ​​the second set 60 decreases along the extension direction of the second set 60 away from the fixing component 10.

[0054] It should be noted that the diameter changes of the first set 50 and the second set 60 can be linear or stepwise. When the diameters of the first set 50 and the second set 60 are linearly varied, the diameter of the starting end of the first set 50 is the same as the diameter of the first anchor rod 20, and the diameter of the ending end of the first set 50 can be gradually reduced to 10-20 mm. Similarly, the diameter of the starting end of the second set 60 is the same as the diameter of the second anchor rod 30, and the diameter of the ending end of the second set 60 can be gradually reduced to 10-20 mm.

[0055] For example, if the diameter of the first anchor body 20 is 30 mm, then the diameter of the starting end of the first set body 50 is also 30 mm, and the diameter of the ending end of the first set body 50 can be 10-20 mm. The diameter between the starting end and the ending end of the first set body 50 can be gradually reduced; or, the diameter between the starting end and the ending end of the first set body 50 can be reduced in a step-like manner. For example, 2-3 steps with different diameters can be set, each step being 0.5-1 meter long, with a diameter reduction of 5-10 mm. That is to say, for a first set body 50 with a starting diameter of 30 mm, the diameter of the first step can be 20 mm, and the diameter of the second step (i.e., the ending end of the first set body 50) can be 10 mm.

[0056] For example, if the diameter of the second anchor body 20 is 30 mm, then the diameter of the starting end of the second sleeve body 50 is also 30 mm, and the diameter of the ending end of the second sleeve body 50 can be 10-20 mm. The diameter between the starting end and the ending end of the second sleeve body 50 can be gradually reduced; or, the diameter between the starting end and the ending end of the second sleeve body 50 can be reduced in a step-like manner. For example, 2-3 steps with different diameters can be set, each step being 0.5-1 meter long, with a diameter reduction of 5-10 mm. That is to say, for a second sleeve body 50 with a starting diameter of 30 mm, the diameter of the first step can be 20 mm, and the diameter of the second step (i.e., the ending end of the second sleeve body 50) can be 10 mm.

[0057] In one embodiment, the inclination angle of the second anchor body 30 in the anchor member 01 can be further described. Optionally, the inclination angle of the second anchor body 30 is in the range of 10 degrees to 30 degrees.

[0058] It should be noted that in actual engineering, the tilt angle of the second anchor body 30 can be precisely controlled by measuring instruments (e.g., total station or level instrument in conjunction with angle measuring device) to ensure construction accuracy within ±1 degree.

[0059] The inclination angle of the second anchor body provided in this application embodiment is limited so that the anchor body can adapt to different working conditions, thereby improving the construction safety under different construction conditions.

[0060] In one embodiment, the first anchor body 20 in the anchor member 01 can be further defined. The first anchor body 20 includes a fixed rod body and a movable rod body. One end of the fixed rod body is inserted into the first side of the fixed member 10 away from the ground along the vertical axis of the fixed member 10. The other end of the fixed rod body is connected to one end of the movable rod body. The other end of the movable rod body is tilted and rotated relative to the fixed rod body at a preset angle to a preset position. The length of the fixed rod body is in the range of 0.5 meters to 2 meters.

[0061] It should be noted that the starting position for tilting—the distance from the bottom or top of the anchor bolt—needs to be determined based on project requirements. Generally, if calculated from the bottom of the first anchor bolt body 20, the starting position for tilting may be 0.5-1 meter in small projects, and 1-2 meters in large projects. When calculating from the top, the length of the first anchor bolt body 20 protruding above the ground or structure must be considered. Typically, the tilting begins within the range of 0.5-1.5 meters after subtracting the protruding length from the total length of the first anchor bolt body 20.

[0062] The tilt position of the first anchor body provided in this embodiment of the application, by limiting the tilt angle of the first anchor body, enables the anchor body to adapt normally to different working conditions, thereby improving the construction safety under different construction conditions.

[0063] In one embodiment, the grouting material parameters of the anchor member 01 can also be limited. Optionally, the strength grade of the new cement-based grouting material can reach M30-M50. However, in general rock and soil anchoring conditions, grouting material strength of M30-M40 is sufficient. For special conditions with extremely high anchoring strength requirements, such as large bridge foundation conditions or foundation reinforcement conditions of tall buildings, grouting material of M50 can be selected.

[0064] In one embodiment, the flowability of the grout in the anchor member 01 can also be limited. Optionally, the initial flowability of the grout should be between 250-350 mm, and after 30 minutes, the flowability of the grout should not be less than 200 mm. It should be noted that the flowability of the grout can be measured by a special grout flowability testing instrument (e.g., a truncated cone mold) to ensure that the grout has good fluidity during construction and can fully fill the gap between the anchor and the hole wall.

[0065] In one embodiment, the setting time of the grout for the anchor member 01 can also be limited. Optionally, the initial setting time of the grout is generally 4-6 hours, and the final setting time is between 8-12 hours. It should be noted that the setting time can be controlled by adjusting the grout formulation (e.g., cement type, admixture type and dosage) to adapt to the requirements of different construction progress and environmental conditions.

[0066] It should be noted that in the design of new anchor bolt components, the determination of which parts of the anchor bolt component should be set in an inclined state and the inclination angle should be flexibly adjusted according to the specific engineering geological conditions and construction requirements. Generally speaking, the initial part of the anchoring section of the anchor bolt body near the soil or rock surface can be set in an inclined state. For example, in slope reinforcement projects, if the slope soil is relatively loose and has a certain tendency to slide, in order to enhance the anchoring effect and resistance to horizontal forces, the anchor bolt part within 0.5-1.5 meters from the slope surface can be set in an inclined state. Its inclination angle is usually between 10 degrees and 30 degrees. Smaller inclination angles (such as 10 degrees-15 degrees) are suitable for situations where the geological conditions are relatively stable and the main force is relatively small. In this case, the inclined anchor bolt can provide a certain horizontal component force to enhance the anchoring stability without increasing the construction difficulty or disturbing the soil due to an excessively large angle. In engineering projects with complex geological conditions and large horizontal forces, such as rock and soil anchoring projects in high and steep slopes or earthquake-prone areas, an inclination angle of 20 to 30 degrees can be used to provide a larger horizontal component force to resist soil displacement.

[0067] It should be noted that the technical principle behind using inclined anchor bolts to improve construction stability is as follows: First, the inclined arrangement of the anchor bolt changes the single force distribution mode of the traditional vertical anchor bolt. In soil or rock, inclined anchor bolts can better utilize the inherent resistance of the soil or rock mass, decomposing the anchoring force into vertical and horizontal components. The vertical component helps increase the friction between the anchor bolt and the soil or rock mass, improving the anchor bolt's pull-out resistance; the horizontal component directly resists the horizontal displacement tendency of the soil or rock mass, such as effectively preventing lateral sliding of the soil in slope engineering.

[0068] In addition, regarding construction, inclined anchor bolts can be constructed using mechanical Luoyang shovels and anchor bolt drilling rigs. When excavating inclined anchor bolt holes, the unique shovel head design and operation method of the mechanical Luoyang shovel can adapt to drilling operations at certain angles. By adjusting the cutting angle and rotation method of the shovel head, inclined holes that meet design requirements can be formed in the soil. Compared with traditional vertical drilling equipment, no complex angle conversion device is needed, making operation simpler. When constructing inclined anchor bolts, the adjustable drill rod angle system of the anchor bolt drilling rig can precisely control the inclination of the borehole. Combined with specially designed drill bits, it can efficiently drill into the soil and rock, reducing excessive disturbance to the surrounding soil and rock, improving construction efficiency and hole formation quality. In grouting operations, the structure of the inclined anchor bolt facilitates the flow and filling of grout within the hole. Due to the inclination angle of the anchor bolt, the grout can more smoothly fill the gap between the anchor bolt and the hole wall under the action of gravity and pressure, ensuring the anchoring effect. Meanwhile, the new cement-based grouting material has good fluidity and adhesion, which can better adapt to the shape of inclined holes and further enhance the connection strength between the anchor and the soil, thereby realizing a convenient and efficient construction process.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0070] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An anchor rod member, characterized by, The anchor bolt component includes: a fixing component, multiple first anchor bolt bodies, and multiple second anchor bolt bodies; Wherein, one end of the plurality of first anchor rods is inserted along the vertical axis of the fixing component on the first side of the fixing component away from the ground; one end of the plurality of second anchor rods is inserted at a preset angle on the first side of the fixing component away from the ground, and the extension direction of the other end of each second anchor rod does not intersect with the extension direction of the other end of any first anchor rod.

2. A rock bolt member according to claim 1, characterised in that The anchor bolt component further includes a support component, which is fixed to the second side of the fixing component near the ground; the support component is used to support the external component.

3. A rock bolt member according to claim 1 or 2, c h a r a c t e r i s e d in that The length of the second anchor body is not less than the length of the first anchor body.

4. A rock bolt member according to claim 1, characterised in that The length of the first anchor bolt is in the range of 3-5 meters or 8-10 meters; the length of the second anchor bolt is in the range of 3-5 meters or 8-10 meters.

5. A rock bolt member according to claim 1 or 2, c h a r a c t e r i s e d in that The first anchor rod body is cylindrical in shape, the second anchor rod body is cylindrical in shape, and the diameter of the second anchor rod body is not less than the diameter of the first anchor rod body.

6. A rock bolt member according to claim 5, characterised in that The diameter of the first anchor body is in the range of 20 mm to 30 mm, or in the range of 40 mm to 50 mm; the diameter of the second anchor body is in the range of 20 mm to 30 mm, or in the range of 40 mm to 50 mm.

7. A rock bolt member according to claim 5, characterised in that The anchor bolt component also includes a first set and a second set; The first sleeve is fitted outside the first anchor rod body and is located at the insertion position between the first anchor rod body and the fixing component, and the ratio between the length of the first sleeve and the length of the first anchor rod body is in the range of 1 / 4 to 1 / 3. The second sleeve is fitted outside the second anchor rod body and is located at the insertion position between the second anchor rod body and the fixing component. The ratio between the length of the second sleeve and the length of the second anchor rod body is in the range of 1 / 4 to 1 / 3.

8. The anchor bolt component according to claim 7, characterized in that, The cross-sectional area of ​​the first sleeve decreases along the direction in which the first sleeve extends away from the fixing component; the cross-sectional area of ​​the second sleeve decreases along the direction in which the second sleeve extends away from the fixing component.

9. The anchor bolt component according to claim 1, characterized in that, The inclination angle of the second anchor body is within the range of 10 degrees to 30 degrees.

10. The anchor bolt component according to claim 9, characterized in that, The first anchor bolt body includes a fixed rod body and a movable rod body; one end of the fixed rod body is inserted into the first side of the fixed component away from the ground along the vertical axis of the fixed component, and the other end of the fixed rod body is connected to one end of the movable rod body. The other end of the movable rod body is tilted and rotated relative to the fixed rod body at a preset angle to a preset position; the length of the fixed rod body is in the range of 0.5 meters to 2 meters.

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