Prestress sheath damage repairing device

Abstract

The utility model relates to a prestressed sheath damage repairing device which comprises a prestressed tendon and a replacement sheath, the prestressed tendon is sleeved with an original sheath, filler is arranged in the original sheath, a substitute is arranged on the inner side of the filler, the substitute can be in a rod shape or a pipe shape, and the replacement sheath is arranged in the original sheath. The diameter of the substitute is larger than that of a steel strand in the prestressed tendon, and a guide rod structure is installed on one side of the steel strand. Through the guide rod structure, the replacement sheath, the sheath bonding substance and other structures, after pile top over-grouting section concrete is broken, the original seriously-damaged sheath and filler on the prestressed tendon are removed, only the steel strand is left, then the guide rod structure is installed, the replacement sheath is cut into the needed length, and when the replacement sheath is installed, the replacement sheath bonding substance is not required to be replaced. The replacement sheath is sleeved into the steel strand while the replacement object is drawn out, so that the situation that the replacement sheath is difficult to install is prevented.

Description

Technical Field

[0001] This application relates to the field of foundation engineering technology, and in particular to a prestressed sheath damage repair device. Background Technology

[0002] Currently, prestressed anti-buoyancy piles can be divided into two categories: tensioning at the pile top and tensioning at the bottom slab. Both methods damage the prestressing tendon sheath during construction. This damage is mainly caused by the following two processes: First, after the prestressed pile is poured, during the excavation of the pile head, the prestressing tendons above the designed pile top elevation are subjected to mechanical impacts and crushing, causing damage to the prestressing tendon sheath. If not repaired, this will severely affect the tensioning of the prestressing tendons. Second, during the removal of the over-poured concrete section at the pile head, the prestressing tendons may be subjected to mechanical hammering and pulling, causing varying degrees of damage to the prestressing tendon sheath above the pile top, which in turn severely affects the tensioning of the prestressing tendons.

[0003] Similarly, when prestressed anti-buoyancy piles or anchors are tensioned on the top of the base slab, the sheath of the prestressed tendons in the base slab section may be severely damaged due to construction reasons. The sheath may be difficult to repair, and the prestressed tendons may need to be cut off. Using connectors to extend them is costly.

[0004] Therefore, existing technologies have shortcomings and need to be improved. Summary of the Invention

[0005] This application provides a prestressed sheath damage repair device to solve the problem that when prestressed anti-buoyancy piles or anchors are tensioned on the top of the base slab, the prestressed tendons in the base slab section are severely damaged due to construction reasons, the sheath is difficult to repair, the prestressed tendons need to be cut off, and the cost of using connectors to extend them is high.

[0006] In a first aspect, this application provides a prestressed sheath damage repair device, including a prestressing tendon and a replacement sheath. The original sheath is fitted onto the prestressing tendon, and a filler is provided inside the original sheath. A substitute is provided inside the filler. The substitute can be rod-shaped or tubular, and the diameter of the substitute is larger than the diameter of the steel strand in the prestressing tendon. A guide rod structure is installed on one side of the steel strand. The guide rod structure is cylindrical on the side near the steel strand, and the diameter of the cylinder is smaller than the diameter of the steel strand. The guide rod structure is conical on the side away from the steel strand. The guide rod structure is used to fit the replacement sheath onto the steel strand. The size of the replacement sheath is larger than the size of the damaged original sheath.

[0007] Optionally, the prestressing tendon is a loosely bonded prestressing tendon or an unbonded prestressing tendon.

[0008] Optionally, the filler is a retarded adhesive or grease.

[0009] Optionally, when the prestressing tendon is a slow-setting prestressing tendon, the filler is a slow-setting adhesive; when the prestressing tendon is an unbonded prestressing tendon, the filler is grease.

[0010] Alternatively, the alternative may be flexible ABS plastic or PVC bendable material.

[0011] Optionally, the guide rod structure is made of plastic or metal.

[0012] Optionally, the guide rod structure has a circular hole at the bottom of the side near the steel strand, and the diameter of the circular hole is larger than the diameter of the center wire of the steel strand used, and the steel strand is inserted into the circular hole.

[0013] Optionally, the circular hole is formed inside the guide rod structure at a depth greater than 15mm.

[0014] Optionally, the replacement sheath and the original sheath are bonded together using a sheath adhesive.

[0015] Optionally, the sheath adhesive is polyethylene tape or hot melt adhesive stick.

[0016] The technical solutions provided in this application have the following advantages compared with the prior art:

[0017] This embodiment of the application, through the use of a guide rod structure, a replacement sheath, and a sheath adhesive, removes the severely damaged original sheath and filler material from the prestressing tendons after breaking through the over-poured concrete section at the pile top, leaving only the steel strands. Then, the guide rod structure is installed, and the replacement sheath is cut to the required length. During installation, the replacement sheath is inserted into the steel strands while the replacement material is being pulled out, preventing difficulties in installation. After installation, the original sheath and the replacement sheath are bonded together using the sheath adhesive, while ensuring that the filler material does not... It will flow out from the bonding point, tie the bottom slab reinforcement, and pour concrete. This solves the problem that when prestressed anti-buoyancy piles or anchors are tensioned on the top of the bottom slab, the prestressed tendons in the bottom slab section are severely damaged due to construction reasons, the sheaths are difficult to repair, the prestressed tendons need to be cut off, and the cost of using connectors to extend them is high. This application uses prestressed tendons to replace the sheaths, which can repair large areas of damaged sheaths and ensure the effect of prestressed tendons being tensioned on the top of the bottom slab. Compared with the method of cutting prestressed tendons and then using connectors to extend them, the cost is significantly reduced. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0021] Figure 1 This is a schematic diagram of the main structure of a prestressed tendon replacement sleeve provided in an embodiment of this application.

[0022] Figure 2 This is a side view schematic diagram of a prestressed tendon replacement sheath provided in an embodiment of this application.

[0023] Figure 3 This is a schematic diagram of a guide rod structure and a steel strand connection structure provided in an embodiment of this application.

[0024] Figure 4 This is a schematic diagram of the structure after the severely damaged sheath on the pile top is removed, as provided in an embodiment of this application.

[0025] Figure 5 This is a schematic diagram of the structure after installing a replacement sheath on the pile top, as provided in an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Existing sheath; 2. Filler; 3. Replacement; 4. Steel strand; 5. Guide rod structure; 6. Prestressed tendon; 7. Sheath adhesive; 8. Replacement sheath; 9. Over-irrigation section. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0030] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0031] To address the technical problems in the prior art, this application provides a prestressed sheath damage repair device. This device, through a set guide rod structure, a replacement sheath, and a sheath adhesive, removes the severely damaged original sheath and filler from the prestressing tendons after breaking through the over-poured concrete section at the top of the pile, leaving only the steel strands. Then, the guide rod structure is installed, and the replacement sheath is cut to the required length. During installation, the replacement sheath is inserted into the steel strands while the replacement material is being pulled out, preventing difficulties in installation. After installation, the original sheath and the replacement sheath are bonded together using the sheath adhesive, ensuring that the filler does not leak from the bonding point. The bottom slab reinforcement is then tied, and concrete is poured. This device solves the problem that when prestressed anti-buoyancy piles or anchors are tensioned at the top of the bottom slab, the prestressing tendons in the bottom slab section suffer severe sheath damage due to construction reasons, making repair difficult and requiring the prestressing tendons to be cut off, while using connectors for splicing is costly.

[0032] Figure 1-5A prestressed sheath repair device provided in this application embodiment includes a prestressed tendon 6 and a replacement sheath 8. The original sheath 1 is fitted onto the prestressed tendon 6, and a filler 2 is provided inside the original sheath 1. The filler 2 should be a slow-setting adhesive or grease with high fluidity to facilitate the removal of a replacement material 3 during construction. A replacement material 3 is provided inside the filler 2. The replacement material 3 can be a flexible ABS plastic or a bendable PVC material, and its shape can be rod-shaped or tubular. The diameter of the replacement material 3 is larger than that of the steel strand in the prestressed tendon 6. The diameter of the steel strand 4 is 4. A guide rod structure 5 is installed on one side of the steel strand 4. The guide rod structure 5 can be made of plastic or metal. The side of the guide rod structure 5 near the steel strand 4 is cylindrical and the diameter of the cylinder is smaller than the diameter of the steel strand 4. The side of the guide rod structure 5 away from the steel strand 4 is conical. The guide rod structure 5 is used to fit the replacement sheath 8 onto the steel strand 4. The replacement sheath 8 and the original sheath 1 are bonded together by a sheath adhesive 7, which is polyethylene tape or hot melt glue stick. The size of the replacement sheath 8 is larger than the damaged original sheath 1.

[0033] In this utility model, by setting up a guide rod structure 5, a replacement sheath 8, and a sheath adhesive 7, after breaking the over-poured concrete section 9 at the top of the pile, the severely damaged original sheath 1 and filler 2 on the prestressing tendon 6 are removed, leaving only the steel strand 4. Then, the guide rod structure 5 is installed, and the replacement sheath 8 is cut to the required length. When installing the replacement sheath 8, the replacement material 3 is pulled out while the replacement sheath 8 is inserted into the steel strand 4 to prevent the replacement sheath 8 from being difficult to install. After the replacement sheath 8 is installed, the original sheath 1 and the replacement sheath 8 are bonded together with the sheath adhesive 7, while ensuring that the filler 2 does not flow out from the bonding point. The bottom slab reinforcement is tied, and concrete is poured. This solves the problem that when prestressed anti-buoyancy piles or anchors are tensioned at the top of the bottom slab, the sheath of the prestressing tendon in the bottom slab section is severely damaged due to construction reasons, the sheath is difficult to repair, the prestressing tendon needs to be cut off, and the cost of using connectors for extension is high.

[0034] Preferably, the prestressing tendon 6 is a slow-bonding prestressing tendon or an unbonded prestressing tendon. The original sheath 1 corresponding to the slow-bonding prestressing tendon is made of ribbed polyethylene plastic, and the original sheath 1 corresponding to the unbonded prestressing tendon is made of smooth polyethylene material. The filler 2 is a slow-setting adhesive or grease. When the prestressing tendon 6 is a slow-bonding prestressing tendon, the filler 2 is a slow-setting adhesive, and when the prestressing tendon 6 is an unbonded prestressing tendon, the filler 2 is grease.

[0035] Please see Figure 1-4The guide rod structure 5 has a horizontally oriented circular hole at its bottom side near the steel strand 4. The diameter of the circular hole is larger than the diameter of the center wire of the steel strand 4. The steel strand 4 is inserted into the circular hole, which is more than 15mm deep inside the guide rod structure 5. With the guide rod structure 5 and the circular hole, when the guide rod structure 5 needs to be installed, the top of the steel strand 4 is cut, leaving the top center wire exposed for more than 15mm. The center wire of the steel strand 4 is then inserted into the circular hole, thus completing the installation of the guide rod structure 5. The guide rod structure 5 is easy to install and disassemble.

[0036] In use, after breaking the over-poured concrete section at the top of the pile, remove the severely damaged original sheath 1 and filler 2 from the prestressing tendon 6, leaving only the steel strand 4. Then, install the guide rod structure 5. Cut the replacement sheath 8 to the required length. When installing the replacement sheath 8, pull out the substitute 3 while inserting the replacement sheath 8 into the steel strand 4 to prevent the replacement sheath 8 from being difficult to install. After the replacement sheath 8 is installed, use the sheath adhesive 7 to bond the original sheath 1 and the replacement sheath 8, while ensuring that the filler 2 does not flow out from the bonding point. Tie the bottom slab reinforcement and pour concrete. When it is necessary to install the guide rod structure 5, cut the top of the steel strand 4, retaining the top center wire, with the center wire exposed more than 15mm. Insert the center wire of the steel strand 4 into the round hole to complete the installation of the guide rod structure 5.

[0037] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0038] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 application.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0043] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0044] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A prestressed sheath damage repair device, characterized in that: The device includes prestressing tendons and replacement sleeves. An original sleeve is fitted onto the prestressing tendon, and a filler is placed inside the original sleeve. A substitute is placed inside the filler, and the substitute can be rod-shaped or tubular. The diameter of the substitute is larger than the diameter of the steel strand in the prestressing tendon. A guide rod structure is installed on one side of the steel strand. The guide rod structure is cylindrical on the side closest to the steel strand, with a diameter smaller than the diameter of the steel strand. The guide rod structure is conical on the side furthest from the steel strand. The guide rod structure is used to fit the replacement sleeve onto the steel strand. The size of the replacement sleeve is larger than the size of the damaged original sleeve.

2. The prestressed sheath damage repair device according to claim 1, characterized in that: The prestressing tendons are either loosely bonded prestressing tendons or unbonded prestressing tendons.

3. The prestressed sheath damage repair device according to claim 2, characterized in that: The filler is a retarded adhesive or grease.

4. The prestressed sheath damage repair device according to claim 3, characterized in that: When the prestressing tendon is a slow-setting prestressing tendon, the filler is a slow-setting adhesive; when the prestressing tendon is an unbonded prestressing tendon, the filler is grease.

5. The prestressed sheath damage repair device according to claim 1, characterized in that: The alternative can be flexible ABS plastic or PVC bendable material.

6. The prestressed sheath damage repair device according to claim 1, characterized in that: The guide rod structure is made of plastic or metal.

7. The prestressed sheath damage repair device according to claim 1, characterized in that: The guide rod structure has a horizontally arranged circular hole at the bottom of the side near the steel strand, and the diameter of the circular hole is larger than the diameter of the center wire of the steel strand. The steel strand is inserted into the circular hole.

8. The prestressed sheath damage repair device according to claim 7, characterized in that: The circular hole is opened inside the guide rod structure at a depth greater than 15mm.

9. The prestressed sheath damage repair device according to claim 1, characterized in that: The replacement sheath and the original sheath are bonded together using a sheath adhesive.

10. A prestressed sheath damage repair device according to claim 9, characterized in that: The sheath adhesive is polyethylene tape or hot melt adhesive stick.

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