In-vitro chordae tendinae steering device

Abstract

An external cable steering branch device relates to the technical field of external prestressed engineering, which is installed in concrete and comprises a guide sleeve, a branch guide and an external anchor cable; the guide sleeve has a conical outer surface; the branch guide is installed in the guide sleeve, the outer circle of the branch guide is provided with conical chamfers at both ends respectively, an anchor cable guide hole is arranged in the branch guide, and the distribution of the anchor cable guide hole is consistent with the distribution of the anchor hole of the tensioning end anchorage device; the half-cone angle of the conical outer surface of the guide sleeve, the conical chamfer angle of the outer circle of the branch guide at both ends and the deflection angle of the external anchor cable are consistent and are all alpha. During tensioning, the anchor cable drives the branch guide to deflect, the bending steering is realized through the cooperation of the two, and the two do not directly contact the concrete. The utility model can reduce the tensioning friction, protect the anticorrosive coating of the anchor cable, ensure uniform stress of the anchor cable, has simple structure and convenient installation, and is suitable for external prestressed engineering of bridges, buildings and the like.

Description

Technical Field

[0001] This utility model relates to the field of external prestressing engineering technology, specifically to an external cable turning and branching device, which is used to realize the bending and turning of the external anchor cable during the tensioning process, and is applicable to external prestressed components such as bridges and buildings. Background Technology

[0002] In external prestressing engineering, external anchor cables need to bend and deflect during tensioning according to structural requirements. In existing technologies, external anchor cables are often in direct contact with concrete, or deflected only by simple guide components, which presents the following problems: 1. High friction: The anchor cable directly rubs against the concrete, resulting in high tension friction, which affects the accuracy of prestressing application; 2. Coating is easily damaged: Friction can easily damage the anti-corrosion coating on the anchor cable surface, shortening the service life of the anchor cable; 3. Inaccurate steering: Lack of precise line guidance makes the anchor cable prone to tangling, resulting in uneven stress after tensioning and reduced anchoring efficiency; 4. Poor adaptability: The steering components and anchor cable deflection angles are poorly matched, making it difficult to guarantee steering stability. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an external cable steering branching device to solve the problems of high friction, easy coating damage, and inaccurate steering in the existing external anchor cable steering structure.

[0004] The technical solution to the above-mentioned technical problems is: an external cable steering and branching device, which is installed in concrete and includes a guide sleeve, a branching guide, and an external anchor cable; the guide sleeve has a conical outer surface; the branching guide is installed inside the guide sleeve, and the two ends of the outer circle of the branching guide are respectively provided with conical chamfers, and the branching guide is provided with anchor cable guide holes for the external anchor cable to pass through, and the distribution of the anchor cable guide holes is consistent with the distribution of the anchor holes of the tensioning end anchor; the half-cone angle of the conical outer surface of the guide sleeve, the conical chamfer angle at both ends of the outer circle of the branching guide, and the deflection angle of the external anchor cable are all kept consistent with α.

[0005] A further technical solution of this utility model is that the outer diameter of the large end of the conical chamfer of the branch guide and the inner diameter of the guide sleeve are both D.

[0006] A further technical solution of this utility model is that the material of the branch guide is PA66.

[0007] A further technical solution of this utility model is that the guide sleeve is made of metal.

[0008] A further technical solution of this utility model is that the length of the guide sleeve is L + 8 to 12 mm, which is the length of the branch guide.

[0009] By adopting the above technical solution, the external cable steering and branching device of this utility model has the following advantages compared with the prior art: 1. Can reduce friction: This utility model is installed inside concrete and includes a guide sleeve, a branch line guide, and an external anchor cable. The guide sleeve and branch line guide can play a role in isolation and protection, so that the anchor cable does not come into direct contact with the concrete, which greatly reduces tension friction and stress loss.

[0010] 2. Coating protection: This utility model is installed inside concrete and includes a guide sleeve, a branch line guide, and an external anchor cable. The guide sleeve and branch line guide can play a role in isolation and protection, preventing the anchor cable from directly contacting the concrete, thereby avoiding damage to the anti-corrosion coating of the anchor cable due to friction and extending the service life of the anchor cable. 3. Precise steering: The guide sleeve of this utility model has a conical outer surface; the two ends of the outer circle of the branch guide are respectively provided with conical chamfers, and the half cone angle of the conical outer surface of the branch guide, the cone chamfer angle of the two ends of the outer circle of the guide sleeve, and the deflection angle of the external anchor cable are all kept at α, which can ensure stable turning, and the anchor cable does not twist after passing through the branch guide, and the force is uniform.

[0011] 4. High adaptability: The structure of this utility model is relatively simple, consisting only of a guide sleeve and a branch guide, which is easy to install and highly adaptable.

[0012] The technical features of an external cable steering splitter according to the present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0013] Figure 1 : A schematic diagram of the structure of an external cable steering branching device according to this utility model; Figure 2 : Front sectional view of the guide sleeve described in Embodiment 1; Figure 3 : Front sectional view of the branch guide described in Embodiment 1 Figure 4 : Figure 3 The left view; In the above figures, the reference numerals are explained as follows: 1-Guide sleeve, 2-Branch guide, 201-Anchor cable guide hole 3-External anchor cable, 4-Tensioning end anchor, 5-Concrete. Detailed Implementation Example 1

[0014] An external cable steering branching device is installed inside concrete 5 and includes a guide sleeve 1, a branching guide 2, and an external anchor cable 3.

[0015] The guide sleeve 1 is made of metal, such as Q235 steel, which can ensure its resistance to deformation. The guide sleeve 1 has a conical outer surface and a straight through hole in the inner hole.

[0016] The line guide 2 is installed in the through hole of the guide sleeve 1, and the two can be relatively adapted and deflected. The material of the line guide 2 is PA66 (polyhexamethylene adipamide), which has the characteristics of light weight, high strength and good wear resistance. The two ends of the outer circle of the line guide 2 are respectively provided with conical chamfers. The outer diameter d of the small end of the conical chamfer is consistent with the outer diameter of the anchor plate 401 of the tensioning end anchor 4, and the outer diameter of the large end of the conical chamfer is consistent with the inner diameter of the guide sleeve 1, both of which are D, so as to keep the guide sleeve and the line guide tightly fitted during installation and reduce the loss of tension stress.

[0017] The line guide 2 is provided with an anchor cable guide hole 201 for the external anchor cable 3 to pass through, and the distribution of the anchor cable guide hole 201 is consistent with the distribution of the anchor hole of the tensioning end anchor 4, so that the external anchor cable is parallel during tensioning, does not twist, and is evenly stressed after tensioning, thereby improving the anchoring efficiency.

[0018] The external anchor cables 3 pass through the anchor cable guide holes 201 of the line guide 2 in a preset order; the half-cone angle of the outer surface of the guide sleeve 1 cone, the cone chamfer angle at both ends of the outer circle of the line guide 2, and the deflection angle of the external anchor cables 3 are all kept at α to ensure that the turning path is uniform so as to maintain the best working state after tensioning.

[0019] The length of the line guide 2 is L, and the length L is determined according to the size of the tensioning end; the length of the guide sleeve 1 is = the length of the line guide 2 L + 10mm, or the length of the guide sleeve 1 can be = the length of the line guide 2 L + (any value from 8 to 12) mm.

[0020] The tensioning end anchor 4 is a known technology, including anchor plates, etc., and its structure will not be described in detail here.

[0021] The installation and tensioning process of this utility model is as follows:

[0022] S1. Embedded guide sleeve: Place the guide sleeve into the reserved space in the concrete, ensuring that the angle α of the guide sleeve is consistent with the turning direction of the external anchor cable;

[0023] S2. Assemble the branch guide: Embed the branch guide into the guide sleeve. Since the two have the same mating dimension D, they can fit tightly together. S3. Install anchor cables: Pass the external anchor cables through the guide holes of the branch guide in sequence, ensuring that the anchor cables are parallel and not twisted; S4. Tensioning and Direction: Start the tensioning equipment, and the anchor cable will be stressed and drive the branch guide to deflect at 25°. The branch guide and the guide sleeve will fit together to form a turning channel. The anchor cable will turn smoothly along the channel without direct contact with the concrete throughout the process. S5. Anchorage complete: After tensioning to the design stress, the anchor cable is locked by the anchorage to complete the turning and anchoring.

Claims

1. An external cable steering and branching device, characterized in that, The device is installed in concrete (5) and includes a guide sleeve (1), a branch guide (2) and an external anchor cable (3); the guide sleeve (1) has a conical outer surface; the branch guide (2) is installed in the guide sleeve (1), and the two ends of the outer circle of the branch guide (2) are respectively provided with conical chamfers. The branch guide (2) is provided with an anchor cable guide hole (201) for passing through the external anchor cable (3), and the distribution of the anchor cable guide hole (201) is consistent with the distribution of the anchor hole of the tension end anchor (4); the half cone angle of the conical outer surface of the guide sleeve (1), the conical chamfer angle of the two ends of the outer circle of the branch guide (2) and the deflection angle of the external anchor cable (3) are all α.

2. The external cable steering and branching device according to claim 1, characterized in that, The outer diameter of the large end of the chamfered cone of the branch guide (2) is consistent with the inner diameter of the guide sleeve (1), both being D.

3. The external cable steering and branching device according to claim 1, characterized in that, The material of the branch guide (2) is PA66.

4. The external cable steering and branching device according to claim 1, characterized in that, The guide sleeve (1) is made of metal.

5. An external cable steering and branching device according to claim 1, characterized in that, The length of the guide sleeve (1) is L + 8 to 12 mm, which is the length of the branch guide (2).

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