Prestressed anchor cable steel strand isolation support

Abstract

The utility model discloses a pre-stressed anchor cable steel strand isolation support which comprises an inner supporting support and an outer protection support, the inner supporting support is arranged on the inner side of the outer protection support and connected with the outer protection support in a clamped mode, the inner supporting support is in a disc shape, and a grouting pipe penetrating hole is formed in the center of the inner supporting support. A plurality of steel strand positioning clamping grooves are formed in the edge of the outer side of the inner supporting support at intervals, the steel strand positioning clamping grooves are used for allowing pre-stressed anchor cable steel strands to penetrate through, the pre-stressed anchor cable steel strands are clamped by the steel strand positioning clamping grooves and the outer protection support together, and the pre-stressed anchor cable steel strands can be clamped by arranging the outer protection support and the inner supporting support. And the pre-stressed anchor cable steel strands and the pre-stressed anchor cable hole wall act on the pre-stressed anchor cable together, so that the pre-stressed anchor cable steel strands and the pre-stressed anchor cable steel strands and the anchor cable hole wall are effectively isolated.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to a prestressed anchor cable steel strand isolation bracket. Background Technology

[0002] With the development of civil engineering, traditional construction techniques characterized by prestressed technology have experienced rapid and widespread development and played a significant role in the construction of houses, highways, bridges, and municipal utilities in the new era. Prestressed anchor cables are a type of component primarily bearing tensile force, consisting of anchors, prestressed steel strands, and accessories. They are created by drilling through weak soil layers, fixing one end of the prestressed steel strand to a deep, stable rock layer, grouting the duct, and generating prestress at the tensioning end, thereby stabilizing unstable soil and rock layers and limiting their deformation.

[0003] In civil engineering projects such as slope stabilization, uplift foundations, and foundation pit support, the application of prestressed steel strand anchors is gradually increasing. The fabrication, duct positioning, and duct grouting effectiveness of prestressed steel strand anchors directly affect the subsequent tensioning and shaping of the anchors. Therefore, prestressed anchor construction strives for simple, convenient, and quality-controllable on-site fabrication processes to achieve easy installation, accurate positioning, and good duct grouting results. This process requires the use of prestressed steel strand anchor isolation supports.

[0004] Conventional isolation supports suffer from problems such as difficulty in cable braiding or insecure fixing, and insufficient protective layer thickness. In the use of conventional isolation supports, the contact surface with the anchor cable hole wall is poor, leading to installation difficulties and secondary pollution after cleaning. Insufficient and asymmetrical wrapping of the bottom of the steel strand during anchor cable grouting has a significant impact on the anchoring force and service life of the prestressed anchor cable. Utility Model Content

[0005] This utility model provides a prestressed anchor cable steel strand isolation bracket, which can solve the problems of difficult cable braiding, unstable fixing, and insufficient protective layer thickness of conventional isolation brackets.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a prestressed anchor cable steel strand isolation bracket, comprising an inner support bracket and an outer protective bracket. The inner support bracket is disposed inside the outer protective bracket and is engaged with it. The inner support bracket is disc-shaped with a grouting pipe perforation at its center. The outer edge of the inner support bracket is provided with a plurality of steel strand positioning slots at intervals. The steel strand positioning slots are used for the prestressed anchor cable steel strands to pass through and, together with the outer protective bracket, clamp the prestressed anchor cable steel strands. By setting the outer protective bracket and the inner support bracket, the prestressed anchor cable steel strands can be clamped tightly. The two act together on the prestressed anchor cable, so that the prestressed anchor cable steel strands are effectively isolated from each other and from the anchor cable hole wall.

[0007] Preferably, the outer protective bracket is cylindrical and is formed by two semi-annular sections that are joined together. The inner end of each semi-annular section has multiple slots around its circumference. The inner support bracket is snapped into and fixed in the slots. The outer protective bracket has a certain axial thickness to provide a sufficient protective layer. The slots facilitate assembly and snapping with the inner support bracket.

[0008] Preferably, the slot is offset from the steel strand positioning slot so that the slot will not interfere with the prestressed anchor cable steel strand.

[0009] Preferably, the slot is formed by two protrusions arranged vertically to facilitate clamping and fixing the inner support bracket.

[0010] Preferably, the outer wall of the outer protective bracket is arc-shaped, so that the thickness of the outer protective bracket's side wall gradually increases from one end to the other. The inner support bracket is snapped and fixed at the end of the outer protective bracket with a thicker side wall. The end of the outer protective bracket with a thinner cylindrical wall faces the direction of the prestressed anchor cable's entry hole, and the edge of the inner support bracket is snapped into the slot of the outer protective bracket. The inner and outer brackets and the steel strands are tightly connected.

[0011] Preferably, a semi-circular groove is provided on the outer side wall of the outer protective bracket at a thicker position. A binding wire is embedded in the semi-circular groove to hold the outer protective bracket in place. The semi-circular groove facilitates the positioning of the binding wire, and the prestressed anchor cable strands can be clamped by the outer protective bracket using the binding wire.

[0012] Preferably, the inner support bracket has vent holes evenly arranged around the grouting pipe perforation in the middle.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] It features stable fabrication quality, easy insertion into holes, no secondary pollution in the ducts, accurate anchor cable positioning, and good grouting quality. By improving the steel strand isolation bracket, it provides a prestressed anchor cable isolation bracket with simple structure and process, reliable quality, low price, convenient on-site construction operation, and guaranteed grouting quality of prestressed anchor cables. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a structural diagram of the internal support bracket of this utility model;

[0017] Figure 3 This is a schematic diagram of the assembly process of this utility model;

[0018] Figure 4 This is a schematic diagram illustrating the installation and use process of this utility model.

[0019] Figure label:

[0020] 1. Internal support bracket; 11. Prestressed anchor cable steel strand; 2. External protective bracket; 3. Grouting pipe perforation; 4. Steel strand positioning slot; 5. Vent hole; 6. Semi-circular section; 7. Slot; 8. Protrusion; 9. Semi-circular groove; 10. Grouting pipe. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0022] like Figure 1-4 As shown, this utility model provides the following technical solution to solve the problems of difficult cable weaving, insecure fixing, and insufficient protective layer thickness of conventional isolation supports: a prestressed anchor cable steel strand isolation support, including an inner support support 1 and an outer protective support 2. The inner support support 1 is set inside the outer protective support 2 and is snapped into the outer protective support 2. The inner support support 1 is disc-shaped and has a grouting pipe through hole 3 in its center. The outer edge of the inner support support 1 is provided with several steel strand positioning slots 4 at intervals. The steel strand positioning slots 4 are used for the prestressed anchor cable steel strands 11 to pass through and together with the outer protective support 2, clamp the prestressed anchor cable steel strands 11. By setting the outer protective support 2 and the inner support support 1, the prestressed anchor cable steel strands 11 can be clamped. The two work together on the prestressed anchor cable, so that the prestressed anchor cable steel strands 11 are effectively isolated from each other and from the anchor cable hole wall. The middle part of the inner support support 1 is evenly provided with vent holes 5 around the grouting pipe through hole 3.

[0023] In this embodiment, as Figure 1-3As shown, the outer protective bracket 2 is cylindrical and is formed by two semi-annular portions 6 that are joined together. The inner side of the semi-annular portion 6 is provided with multiple slots 7 around the circumference. The inner support bracket 1 is snapped and fixed in the slots 7. The outer protective bracket 2 has a certain axial thickness, which can provide a sufficient protective layer. The slots 7 facilitate assembly and snapping with the inner support bracket 1.

[0024] In this embodiment, as Figure 1 and 3 As shown, the slot 7 is offset from the steel strand positioning slot 4, so that the slot 7 will not interfere with the prestressed anchor cable steel strand 11. The slot 7 is formed by two protrusions 8 arranged vertically to facilitate clamping and fixing the inner support bracket 1.

[0025] In this embodiment, as Figure 1 As shown, the outer wall of the outer protective bracket 2 is arc-shaped, so that the thickness of the outer protective bracket 2 gradually increases from one end to the other. The inner support bracket 1 is snapped and fixed at the end of the outer protective bracket 2 with a thicker side wall. The end of the outer protective bracket cylinder 2 with a thinner wall faces the direction of the prestressed anchor cable's entry hole, and the edge of the inner support bracket 1 is snapped into the slot of the outer protective bracket. The inner and outer brackets and the steel strand are tightly connected.

[0026] In order to fix the outer protective bracket 2, a semi-circular groove 9 is provided on the outer side wall of the outer protective bracket 2 at the thicker part of the wall. A binding wire is embedded in the semi-circular groove 9 to hold the outer protective bracket 2. The semi-circular groove 9 facilitates the positioning of the binding wire. The prestressed anchor cable strand 11 can be clamped by the outer protective bracket 2 through the binding wire.

[0027] In this embodiment, the inner support bracket 1 is disc-shaped with an outer diameter of 110-150mm and a thickness of 15mm. It has a 36mm grouting pipe perforation 3 in the center. The bracket edge is symmetrically distributed with steel strand positioning grooves 4 with a width and depth of 15-22mm, and the openings face outwards. There are vent holes 5 with a diameter of 20mm distributed between the grouting pipe perforation 3 and the steel strand positioning grooves 4.

[0028] The outer protective bracket 2 is cylindrical in shape. The inner side of the cylinder has a discontinuous slot 7 for connecting with the inner bracket. The slot 7 is positioned to avoid the position of the prestressed anchor cable strand 11. The slot 7 is 16mm wide, which is 1mm thicker than the inner support bracket 1, so that the inner support bracket can be inserted into it. The slot 7 is 10mm deep and the thickness of the two sides of the slot is 5mm.

[0029] like Figure 3 The installation process of the prestressed anchor cable isolation bracket shown is as follows:

[0030] 1. Installation of prestressed steel strands and grouting pipes:

[0031] The prestressed steel strand 11 is selected according to the model parameters required by the design. Based on the quantity and specifications of the steel strands and the anchor cable diameter, the specific dimensions of the prestressed anchor cable steel strand support are selected. The steel strands are cut on a flat and clean construction site. The protective sleeves and grease on the anchoring end of the prestressed anchor cable steel strands are cleaned. Starting from the anchoring end of the prestressed steel strand 11, isolation supports are placed at 1500mm intervals. The steel strands are sequentially embedded into the steel strand positioning slots 4 of the inner support bracket 1 of the isolation supports, ensuring the steel strands are perpendicular to the plane of the support.

[0032] 2. Installation of external protective bracket:

[0033] The two halves of the outer protective bracket 2 are wrapped around the steel strands and the inner support bracket 1 from both sides. The end of the outer protective bracket 1 with the thinner cylindrical wall faces the direction of the prestressed anchor cable's entry hole, and the edge of the inner support bracket is inserted into the slot of the outer protective bracket. The inner and outer brackets and the steel strands are tightly connected. Use 2mm iron wire to tie along the semi-circular groove on the outer wall of the bracket, and ensure that the prestressed steel strand bundle is stable and straight after being tied.

[0034] During the fabrication process, the protective sleeve and grease at the free end of the prestressed anchor cable should be intact, and the protective sleeve should be undamaged. During the binding and fixing of the isolation bracket and steel strand, the Ф20mm grouting pipe 10 is immediately inserted and bound to the isolation bracket. After the prestressed steel strand 11 is fixed to the isolation bracket, a steel pipe guide cap is finally fitted onto the anchoring end of the prestressed steel strand 11 to complete the fabrication and binding of the prestressed steel strand. The prestressed anchor cable duct is thoroughly cleaned, the prestressed steel strand is lifted and installed, slowly placed into the hole, and grout is injected under pressure through the grouting duct. After a certain curing period, the prestressed steel strand is tensioned to form the prestressed anchor cable.

[0035] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0036] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A pre-stressed tendon strand spacer-pier, characterized in that, The utility model relates to a kind of inner support support (1) and outer protective support (2), the inner support support (1) is arranged in the inner side of outer protective support (2) and is clamped with outer protective support (2), the inner support support (1) is disc-shaped, and the center is provided with grouting pipe perforation (3), the outer side edge of the inner support support (1) is spaced apart and is provided with several steel strand positioning clamping groove (4), the steel strand positioning clamping groove (4) is used for pre-stressed anchor cable steel strand (11) to pass through, and pre-stressed anchor cable steel strand (11) is clamped with outer protective support (2) together, the outer protective support (2) is cylindrical, and it is formed by two half-ring parts (6) mutually butting, and the inner side of the half-ring part (6) one end is provided with multiple clamping grooves (7) around circumference, and the inner support support (1) is clamped and fixed in clamping groove (7).

2. The pre-stressed cable strand spacer of claim 1, wherein: The clamping groove (7) is misaligned with the steel strand positioning clamping groove (4).

3. The pre-stressed cable strand spacer of claim 1, wherein: The clamping groove (7) is formed by two blocks (8) arranged in correspondence with each other.

4. The pre-stressed cable strand spacer of claim 1, wherein: The outer side wall of the outer protective support (2) is arc-shaped, so that the thickness of the side wall of the outer protective support (2) gradually increases from one end to the other end, and the inner support support (1) is clamped and fixed at the end where the thickness of the side wall of the outer protective support (2) is thicker.

5. The pre-stressed cable strand spacer of claim 4, wherein: The outer side wall of the outer protective support (2) is provided with a semicircular groove (9) at the position where the thickness is thicker, and a binding iron wire is embedded in the semicircular groove (9) to fix the outer protective support (2).

6. The pre-stressed cable strand spacer of claim 1, wherein: The inner support support (1) is uniformly provided with exhaust holes (5) around the grouting pipe perforation (3) in the middle part.

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