Closed anti-seepage pre-stressed anchor rod and construction method thereof

Abstract

The invention relates to a closed type anti-seepage pre-stressed anchor rod and a construction method thereof. The closed type anti-seepage pre-stressed anchor rod comprises an anti-seepage retard-bonded pre-stressed steel strand, a fixed end assembly connected with one end of the anti-seepage retard-bonded pre-stressed steel strand and a tensioning end assembly connected with the other end of the anti-seepage retard-bonded pre-stressed steel strand. The device is characterized in that the fixed end assembly is provided with a fixed end sealing device which is used for sealing the fixed end assembly; the tensioning end assembly is provided with a tensioning end sealing device used for conducting sealing treatment on the tensioning end assembly. The sealing devices are arranged at the two ends, namely the fixing end and the tensioning end, of the anti-seepage retard-bonded prestressed steel strand correspondingly, sealing treatment is conducted, so that the closed anti-seepage prestressed anchor rod is of a closed structure, the anti-seepage effect is improved, the anchor rod is simple in structure and more convenient to construct, and the construction cost is reduced. And the effect of the closed type anti-seepage pre-stressed anchor rod for resisting the water seepage phenomenon is better achieved.

Description

Technical Field

[0001] The present application relates to the technical field of foundation engineering, and in particular to a closed anti-seepage prestressed anchor rod and a construction method thereof. Background Art

[0002] With the increasing application of prestressed anti-floating anchor rods in underground structures, after a large number of engineering applications, it was found that the anchor rods would seep water at multiple locations, which in turn had an adverse effect on the actual application in the project.

[0003] The reasons for water seepage are: first, there are gaps in the steel strands made of multiple round steel wires twisted in the prestressed anchor rod, which is also a water seepage channel. When the fixed end extrude the anchor and the steel strand into shape, the fixed end does not take necessary sealing measures to prevent water from seeping up along the gaps, resulting in water seeping up along the gaps; second, when the steel strand sheath is severely damaged during construction, water will seep into the gaps in the steel strand and spread to the tensioning end to cause water seepage; third, the steel strand sheath has poor adhesion to concrete, and there is a phenomenon of water seeping along the sheath during engineering applications.

[0004] To address these issues, three types of sealing methods are currently used to address water seepage. One, as described in Chinese Patent Publication No. CN220318520U, involves placing the extruded anchor in a sealed cover and injecting anti-corrosion grease, which only improves corrosion protection at the base of the anchor rod. Another, as described in Chinese Patent Publication No. CN104929117B, places the steel strands in a steel pipe, isolating them from water. This enhances the anchor rod's impermeability but reduces its prestressing effect and increases construction difficulty and cost. Still another, as described in Chinese Patent Publication No. CN218479161U, employs an anchor pad consisting of three cylinders, resulting in a complex structure and poor versatility, impacting construction quality and increasing costs.

[0005] Therefore, the existing technology has defects and needs to be improved. Summary of the Invention

[0006] The present application provides a closed anti-seepage prestressed anchor rod and a construction method thereof to solve the problem of water seepage in multiple places that may occur during the construction process.

[0007] In the first aspect, the present application provides a closed anti-seepage prestressed anchor rod, comprising an anti-seepage slow-bonding prestressed steel strand, a fixed end assembly connected to one end of the anti-seepage slow-bonding prestressed steel strand, and a tensioning end assembly connected to the other end of the anti-seepage slow-bonding prestressed steel strand, the fixed end assembly being provided with a fixed end closing device for sealing the fixed end assembly; the tensioning end assembly being provided with a tensioning end closing device for sealing the tensioning end assembly.

[0008] Optionally, the fixed end assembly also includes an extrusion anchor and a fixed end pad; the fixed end closing device includes a first closing device, a second closing device and a fixed end rubber pad, the first closing device is used to seal the extrusion anchor, and the second closing device is used to seal the connection between the anti-seepage slow-bonding prestressed steel strand and the fixed end assembly, and the first closing device and the second closing device are connected through the fixed end pad to achieve sealing of the fixed end assembly.

[0009] Optionally, a fixed end mounting hole is provided on the fixed end pad, the fixed end rubber pad is provided corresponding to the fixed end mounting hole, and the first closing device is connected to the second closing device through the fixed end mounting hole and the fixed end rubber pad.

[0010] Optionally, the anti-seepage and slow-setting prestressed steel strand comprises an anti-seepage sheath and a steel strand, and a layer of material for anti-seepage and slow-setting bonding is filled between the two.

[0011] Optionally, when the anti-seepage slow-bonding prestressed steel strand is connected to the fixed-end closing device, one end portion with the anti-seepage sheath is partially placed in the fixed-end closing device and bonded and sealed to the fixed-end closing device.

[0012] Optionally, the outer diameter of the anti-permeability slow-bonding prestressed steel strand is smaller than the inner diameter of one end where the fixed end closing device is connected to the anti-permeability slow-bonding prestressed steel strand.

[0013] Optionally, the tensioning end assembly further includes a tensioning end anchor, a clip anchor, a tensioning end pad and a tensioning end rubber pad. The tensioning end closing device is connected to the tensioning end pad through the tensioning end rubber pad and covers the outer peripheral side of the partial anti-seepage slow-bonding prestressed steel strand, the tensioning end anchor, and the clip anchor inserted into the tensioning end assembly.

[0014] Optionally, a tensioning end mounting hole is provided on the tensioning end pad, the tensioning end rubber pad is provided corresponding to the tensioning end mounting hole, and the tensioning end closing device is connected to the tensioning end pad through the tensioning end mounting hole and the tensioning end rubber pad.

[0015] Optionally, the tensioning end closing device is further provided with a mounting hole, and the tensioning end closing device is sealed through the mounting hole.

[0016] On the second aspect, the present application also provides a construction method for the above-mentioned closed anti-seepage prestressed anchor rod, comprising the following steps: step S1, determining the size of the extrusion anchor, fixed end pad, steel strand, tensioning end pad, and tensioning end anchor according to the bearing capacity and diameter of the closed anti-seepage prestressed anchor rod; step S2, removing the anti-seepage sheath and filling material at one end of the anti-seepage slow-bonding prestressed steel strand, passing the exposed steel strand through the second closing device, the fixed end pad and the fixed end rubber pad, and forming the steel strand and the extrusion anchor into one piece by extrusion, and then connecting the first closing device to the fixed end pad through the fixed end rubber pad, placing the filling material in the cavity formed by the fixed end assembly and the fixed end closing device, and The anti-seepage slow-bonding prestressed steel strand is bonded and sealed; step S3, installing other components of the closed anti-seepage prestressed anchor rod, anchoring, pouring anchor rod slurry, and waiting for the anchor rod slurry to reach the design strength; and step S4, removing the anti-seepage sheath and filling material at the other end of the anti-seepage slow-bonding prestressed steel strand, passing the exposed steel strand through the tensioning end pad, placing filling material in the cavity formed between the tensioning end pad and the anti-seepage slow-bonding prestressed steel strand, sleeve the tensioning end anchor and the clip anchor on the outer peripheral side of the steel strand for tensioning construction, the tensioning end closing device is connected to the tensioning end pad through the tensioning end rubber pad, and filling material is placed in the cavity formed by the tensioning end assembly and the tensioning end closing device through the installation hole, and the installation hole is closed.

[0017] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0018] 1. By arranging closing devices at both ends of the anti-seepage slow-bonding prestressed steel strand of the closed anti-seepage prestressed anchor rod, namely the fixed end and the tensioning end, and performing sealing treatment, the closed anti-seepage prestressed anchor rod forms a fully closed structure, which improves the anti-seepage effect. In addition, the anchor rod structure is simple, the construction is more convenient, and it is more conducive to giving full play to the role of the closed anti-seepage prestressed anchor rod in resisting water seepage.

[0019] 2. The first closing device and the second closing device are connected through the fixed end pad to seal the joints between the extrusion anchor, the anti-seepage slow-bonding prestressed steel strand and the fixed end assembly respectively, which not only enhances the stability of the fixed end closing device structure, but also further enhances the anti-seepage effect of the fixed end closing device.

[0020] 3. Combined with the anti-seepage sheath and the anti-seepage slow-setting bonding material layer, it blocks the external environment and the steel strand, avoids the phenomenon of water seeping along the anti-seepage sheath, and improves the anti-seepage effect of the closed anti-seepage prestressed anchor rod anti-seepage slow-setting bonding prestressed steel strand.

[0021] 4. When the closed anti-seepage prestressed anchor anti-seepage slow-bonding prestressed steel strand is connected to the fixed-end closing device, the anti-seepage sheath of the anti-seepage slow-bonding prestressed steel strand is bonded and sealed to the fixed-end closing device to expand the sealing range and further ensure the sealing effect.

[0022] 5. Set the outer diameter of the anti-seepage slow-bonding prestressed steel strand smaller than the inner diameter of the end where the fixed-end closing device is connected to the anti-seepage slow-bonding prestressed steel strand, to ensure the connection and sealing effect of the anti-seepage slow-bonding prestressed steel strand and the fixed-end component, taking into account both structural stability and sealing and anti-seepage effects.

[0023] 6. Connect the tensioning end closing device through the tensioning end pad to seal the tensioning end anchor, clip anchor and some anti-seepage slow-bonding prestressed steel strands placed in the tensioning end assembly to isolate the tensioning end assembly from the external environment and ensure that there will be no water seepage at the tensioning end.

[0024] 7. Compared with the existing technology, the closed anti-seepage prestressed anchor rod has a fully closed structure, and the anchor rod structure is simple. When the closed anti-seepage prestressed anchor rod provided by this application is used in an engineering environment, the overall operation process is simple and clear, which is conducive to convenient construction and cost reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0028] Figure 1 A schematic structural diagram of a closed anti-seepage prestressed anchor rod provided in an embodiment of the present application.

[0029] Figure 2 A schematic structural diagram of a fixed end assembly of a closed anti-seepage prestressed anchor rod provided in an embodiment of the present application.

[0030] Figure 3A schematic cross-sectional view of an anti-seepage slow-bonding prestressed steel strand of a closed anti-seepage prestressed anchor provided in an embodiment of the present application.

[0031] Figure 4 A schematic structural diagram of a tensioning end assembly of a closed anti-seepage prestressed anchor provided in an embodiment of the present application.

[0032] Explanation of the accompanying symbols: 1. Closed anti-seepage prestressed anchor rod; 10. Anti-seepage slow-bonding prestressed steel strand; 101. Anti-seepage sheath; 102. Material layer; 103. Steel strand; 20. Fixed end assembly; 201. Fixed end closing device; 2011. First closing device; 2012. Second closing device; 2013. Fixed end rubber pad; 202. Extrusion anchor; 203. Fixed end pad; 30. Tensioning end assembly; 301. Tensioning end closing device; 3011. Mounting hole; 302. Tensioning end anchor; 303. Clip anchor; 304. Tensioning end pad; 305. Tensioning end rubber pad; 2. Anchor rod slurry. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0034] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0035] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "back," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip or a change in posture or a change in motion, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will subsequently be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0036] In order to solve the technical problems in the prior art, the present application provides a closed anti-seepage prestressed anchor rod 1, which can improve and avoid water seepage at the fixed end, water seepage at the tensioning end, and water seepage along the anti-seepage slow-bonding prestressed steel strand that may occur during construction.

[0037] Figure 1-4 A closed anti-seepage prestressed anchor rod 1 is provided in an embodiment of the present application. The closed anti-seepage prestressed anchor rod 1 includes an anti-seepage slow-bonding prestressed steel strand 10, a fixed end assembly 20 connected to one end of the anti-seepage slow-bonding prestressed steel strand 10, and a tensioning end assembly 30 connected to the other end of the anti-seepage slow-bonding prestressed steel strand 10. The fixed end assembly 20 is provided with a fixed end closing device 201 for sealing the fixed end assembly 20; the tensioning end assembly 30 is provided with a tensioning end closing device 301 for sealing the tensioning end assembly 30. Specifically, in an embodiment of the present application, the fixed end closing device 201 is used to seal the connection between the fixed end assembly 20 and the anti-seepage slow-bonding prestressed steel strand 10 and the end of the fixed end assembly 20 away from the anti-seepage slow-bonding prestressed steel strand 10; the tensioning end closing device 301 is used to seal the end of the tensioning end assembly 30 away from the anti-seepage slow-bonding prestressed steel strand 10.

[0038] Figure 2A fixed end assembly 20 of a closed anti-seepage prestressed anchor rod provided in an embodiment of the present application, the fixed end assembly 20 also includes an extrusion anchor 202 and a fixed end pad 203; the fixed end closing device 201 includes a first closing device 2011, a second closing device 2012 and a fixed end rubber pad 2013, the first closing device 2011 is used to seal the extrusion anchor 202, and the second closing device 2012 is used to seal the connection between the anti-seepage slow-bonding prestressed steel strand 10 and the fixed end assembly 20, the first closing device 2011 and the second closing device 2012 are connected through the fixed end pad 203 to achieve sealing of the fixed end assembly 20.

[0039] Specifically, a fixed end mounting hole (not shown) is provided on the fixed end pad 203, and the fixed end rubber pad 2013 is provided corresponding to the fixed end mounting hole. The first closing device 2011 is connected to the second closing device 2012 through the fixed end mounting hole and the fixed end rubber pad 2013.

[0040] Figure 3 This is a schematic cross-sectional view of an anti-seepage, slow-bonding prestressed steel strand 10 for a closed, anti-seepage prestressed anchor provided in an embodiment of the present application. The anti-seepage, slow-bonding prestressed steel strand 10 comprises an anti-seepage sheath 101 and a steel strand 103, with a layer of material 102 for anti-seepage, slow-setting bonding filled between the two. In this embodiment of the present application, the material layer 102 is a slow-setting adhesive.

[0041] Specifically, the bottom of the first closing device 2011 is protruding so as to play a fixing role after the extrusion anchor 202 and the steel strand 103 are integrally formed.

[0042] In the embodiment of the present application, the distance l1 between the inner wall of the first sealing device 2011 and the outer wall of the extrusion anchor 202 should not be less than 3 mm to ensure the stability of the sealing and anti-seepage effects.

[0043] In the present application, the first closure device 2011 and the second closure device 2012 are connected to the fixed end pad 203 by a threaded connection. It is understood that the connection method between the two can also be a snap connection or an integral molding. In the embodiment of the present application, the fixed end pad 203 is provided with three fixed end mounting holes for fixing the first closure device 2011 and the second closure device 2012.

[0044] In the present application, when the anti-seepage slow-bonding prestressed steel strand 10 is connected to the fixed-end closure device 201, the end portion with the anti-seepage sheath 101 is placed in the second closure device 2012, and is bonded and sealed with the second closure device 2012. Specifically, the outer diameter of the anti-seepage slow-bonding prestressed steel strand 10 is smaller than the inner diameter of the end where the second closure device 2012 is connected to the anti-seepage slow-bonding prestressed steel strand 10. In an embodiment of the present application, the upper diameter of the second closure device 2012 is more than 2 mm larger than the outer diameter of the anti-seepage sheath 101; the length l2 of the overlapping portion between the second closure device 2012 and the anti-seepage sheath 101 is greater than 10 mm; and hot melt adhesive can be used to achieve bonding and sealing between the anti-seepage slow-bonding prestressed steel strand 10 and the second closure device 2012.

[0045] Figure 4 A tensioning end assembly 30 of a closed-type anti-seepage prestressed anchor provided in an embodiment of the present application further includes a tensioning end anchor 302, a clip anchor 303, a tensioning end pad 304, and a tensioning end rubber pad 305. The tensioning end closing device 301 is connected to the tensioning end pad 304 via the tensioning end rubber pad 305 and is disposed over the outer periphery of the portion of the anti-seepage slow-bonding prestressed steel strand 10, the tensioning end anchor 302, and the clip anchor 304 placed in the tensioning end assembly 30. In the embodiment of the present application, the spacing l3 between the tensioning end closing device 301 and the tensioning end anchor 302 is greater than 2 mm to ensure sealing, anti-seepage effects, and structural stability.

[0046] Specifically, the tensioning end pad 304 is provided with a tensioning end mounting hole (not shown), the tensioning end rubber pad 305 is provided corresponding to the tensioning end mounting hole, and the tensioning end closure device 301 is connected to the tensioning end pad 301 through the tensioning end mounting hole and the tensioning end rubber pad 305. In the present application, the tensioning end pad 301 is connected to the tensioning end closure device 301 by a threaded connection, and the connection method between the two can also be selected from snap-on or integral molding. In the embodiment of the present application, three tensioning end mounting holes are provided on the tensioning end pad 304 for fixing the tensioning end closure device 301.

[0047] In the embodiment of the present application, the tensioning end closing device 301 is further provided with a mounting hole 3011. The mounting hole 3011 is located at the top of the tensioning end closing device 301, and the tensioning end closing device 301 is sealed through the mounting hole 3011.

[0048] It is understood that the aforementioned sealing treatment includes, but is not limited to, sealing the relative positions of the components; it can also include the configuration of rubber pads to provide both waterproof sealing, cushioning protection, and improved stability and pull-out resistance; it can also include the injection or placement of filler materials to further enhance the sealing and anti-seepage effects. The filler material used in the embodiments of the present application can be a slow-setting adhesive, polyurethane adhesive, or other adhesive with good fluidity.

[0049] Optionally, the fixed end closing device 201 and the tensioning end closing device 301 may be made of metal, hard plastic or other engineering-suitable materials.

[0050] The present application also provides a construction method using the above-mentioned closed anti-seepage prestressed anchor rod 1, which specifically includes the following steps:

[0051] Step S1, determining the sizes of the extrusion anchor, the fixed end pad, the steel strand, the tensioning end pad, and the tensioning end anchor according to the bearing capacity and diameter of the closed anti-seepage prestressed anchor rod;

[0052] Step S2, removing the anti-seepage sheath and filling material at one end of the anti-seepage slow-bonding prestressed steel strand, inserting the exposed steel strand into the second closing device, the fixed end pad and the fixed end rubber pad, and forming the steel strand and the extrusion anchor into one piece by extrusion, then connecting the first closing device to the fixed end pad via the fixed end rubber pad, placing filling material in the cavity formed by the fixed end assembly and the fixed end closing device, and bonding and sealing the fixed end closing device and the anti-seepage slow-bonding prestressed steel strand;

[0053] Step S3: Install other components of the closed anti-seepage prestressed anchor, anchor, pour anchor slurry, and wait for the anchor slurry to reach the designed strength;

[0054] And step S4, remove the anti-seepage sheath and filling material at the other end of the anti-seepage slow-bonding prestressed steel strand, pass the exposed steel strand through the tensioning end pad, insert the filling material into the cavity formed between the tensioning end pad and the anti-seepage slow-bonding prestressed steel strand, sleeve the tensioning end anchor and the clip anchor on the outer peripheral side of the steel strand for tensioning construction, connect the tensioning end closing device to the tensioning end pad through the tensioning end rubber pad, insert the filling material into the cavity formed by the tensioning end assembly and the tensioning end closing device through the mounting hole, and close the mounting hole.

[0055] Specifically, in step S1, the size of the first closing device 2011 can be determined according to the number of extrusion anchors 202; the size of the fixed end rubber pad 2013 can be determined according to the first closing device 2011 and the second closing device 2012; the size of the fixed end pad 203 can be determined by local pressure calculation; the position and number of the fixed end mounting holes on the fixed end pad 203 can be determined according to the diameter and number of the steel strands 103; the diameter and number of the steel strands 103 can be determined according to the bearing capacity of the closed anti-seepage prestressed anchor rod 1; the size of the tensioning end pad 304 can be determined by local pressure calculation; the position and number of the tensioning end mounting holes on the tensioning end pad 304 can be determined according to the diameter and number of the steel strands 103; the size of the tensioning end closing device 301 can be determined according to the size and number of the tensioning end anchor 302.

[0056] In the embodiment of the present application, the anti-seepage sheath 101 and the material layer 102 at both ends of the anti-seepage slow-bonding prestressed steel strand 10 to be placed in the fixed end assembly 20 and the tensioning end assembly 30 should be removed in order to install the extrusion anchor 202 and the tensioning end anchor 302.

[0057] It can be understood that in step S2, step S3 and step S4, whether it is a filling material such as a retarding adhesive or an adhesive, or when pouring and casting the anchor slurry 2 after anchoring, the filling material should have sufficient fluidity to facilitate injection, and the next step of operation or formal use should be carried out only after the filling material or anchor slurry 2 reaches the design strength.

[0058] Compared with the prior art, the closed anti-seepage prestressed anchor rod and its construction method provided by the present invention have the following beneficial effects:

[0059] 1. By arranging closing devices at both ends of the anti-seepage slow-bonding prestressed steel strand of the closed anti-seepage prestressed anchor rod, namely the fixed end and the tensioning end, and performing sealing treatment, the closed anti-seepage prestressed anchor rod forms a fully closed structure, which improves the anti-seepage effect. In addition, the anchor rod structure is simple, the construction is more convenient, and it is more conducive to giving full play to the role of the closed anti-seepage prestressed anchor rod in resisting water seepage.

[0060] 2. The first closing device and the second closing device are connected through the fixed end pad to seal the joints between the extrusion anchor, the anti-seepage slow-bonding prestressed steel strand and the fixed end assembly respectively, which not only enhances the stability of the fixed end closing device structure, but also further enhances the anti-seepage effect of the fixed end closing device.

[0061] 3. Combined with the anti-seepage sheath and the anti-seepage slow-setting bonding material layer, it blocks the external environment and the steel strand, avoids the phenomenon of water seeping along the anti-seepage sheath, and improves the anti-seepage effect of the closed anti-seepage prestressed anchor rod anti-seepage slow-setting bonding prestressed steel strand.

[0062] 4. When the closed anti-seepage prestressed anchor anti-seepage slow-bonding prestressed steel strand is connected to the fixed-end closing device, the anti-seepage sheath of the anti-seepage slow-bonding prestressed steel strand is bonded and sealed to the fixed-end closing device to expand the sealing range and further ensure the sealing effect.

[0063] 5. Set the outer diameter of the anti-seepage slow-bonding prestressed steel strand smaller than the inner diameter of the end where the fixed-end closing device is connected to the anti-seepage slow-bonding prestressed steel strand, to ensure the connection and sealing effect of the anti-seepage slow-bonding prestressed steel strand and the fixed-end component, taking into account both structural stability and sealing and anti-seepage effects.

[0064] 6. Connect the tensioning end closing device through the tensioning end pad to seal the tensioning end anchor, clip anchor and some anti-seepage slow-bonding prestressed steel strands placed in the tensioning end assembly to isolate the tensioning end assembly from the external environment and ensure that there will be no water seepage at the tensioning end.

[0065] 7. Compared with the existing technology, the closed anti-seepage prestressed anchor rod has a fully closed structure, and the anchor rod structure is simple. When the closed anti-seepage prestressed anchor rod provided by this application is used in an engineering environment, the overall operation process is simple and clear, which is conducive to convenient construction and cost reduction.

[0066] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0067] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0068] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0069] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0070] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0071] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0072] Obviously, those skilled in the art may make various modifications and variations to this application without departing from the spirit and scope of this application. Thus, as long as these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

[0073] The above description is a specific embodiment of the present application, but the scope of protection of the present 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 such modifications or substitutions should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A closed-type anti-seepage prestressed anchor bolt comprising an anti-seepage slow-bonding prestressed steel strand, a fixed end assembly connected to one end of the anti-seepage slow-bonding prestressed steel strand, and a tensioning end assembly connected to the other end of the anti-seepage slow-bonding prestressed steel strand, characterized in that: The fixed end assembly is provided with a fixed end sealing device for sealing the fixed end assembly; the tensioning end assembly is provided with a tensioning end sealing device for sealing the tensioning end assembly.

2. The closed anti-seepage prestressed anchor rod as claimed in claim 1, characterized in that: The fixed end assembly also includes an extrusion anchor and a fixed end pad; the fixed end closing device includes a first closing device, a second closing device and a fixed end rubber pad, the first closing device is used to seal the extrusion anchor, and the second closing device is used to seal the connection between the anti-seepage slow-bonding prestressed steel strand and the fixed end assembly, the first closing device and the second closing device are connected through the fixed end pad to achieve sealing of the fixed end assembly.

3. The closed anti-seepage prestressed anchor rod as claimed in claim 2, characterized in that: The fixed end pad is provided with a fixed end mounting hole, the fixed end rubber pad is provided corresponding to the fixed end mounting hole, and the first closing device is connected to the second closing device through the fixed end mounting hole and the fixed end rubber pad.

4. The closed anti-seepage prestressed anchor rod as claimed in claim 1, characterized in that: The anti-seepage and slow-setting prestressed steel strand comprises an anti-seepage sheath and a steel strand, and a layer of material for anti-seepage and slow-setting bonding is filled between the two.

5. The closed anti-seepage prestressed anchor rod as claimed in claim 4, characterized in that: When the anti-seepage slow-bonding prestressed steel strand is connected to the fixed-end closing device, one end portion with the anti-seepage sheath is placed in the fixed-end closing device and is bonded and sealed with the fixed-end closing device.

6. The closed anti-seepage prestressed anchor rod according to claim 1, characterized in that: The outer diameter of the anti-seepage slow-bonding prestressed steel strand is smaller than the inner diameter of the end where the fixed end closing device is connected to the anti-seepage slow-bonding prestressed steel strand.

7. The closed anti-seepage prestressed anchor rod as claimed in claim 1, characterized in that: The tensioning end assembly also includes a tensioning end anchor, a clip anchor, a tensioning end pad and a tensioning end rubber pad. The tensioning end closing device is connected to the tensioning end pad through the tensioning end rubber pad and is covered on the outer periphery of the part of the anti-seepage slow-bonding prestressed steel strand, the tensioning end anchor, and the clip anchor inserted into the tensioning end assembly.

8. The closed anti-seepage prestressed anchor rod as claimed in claim 7, characterized in that: The tensioning end pad is provided with a tensioning end mounting hole, the tensioning end rubber pad is provided corresponding to the tensioning end mounting hole, and the tensioning end closing device is connected to the tensioning end pad through the tensioning end mounting hole and the tensioning end rubber pad.

9. The closed anti-seepage prestressed anchor rod as claimed in claim 7, characterized in that: The tensioning end closing device is further provided with a mounting hole, through which the tensioning end closing device is sealed.

10. A construction method using the closed anti-seepage prestressed anchor rod according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1, determining the sizes of the extrusion anchor, the fixed end pad, the steel strand, the tensioning end pad, and the tensioning end anchor according to the bearing capacity and diameter of the closed anti-seepage prestressed anchor rod; Step S2, removing the anti-seepage sheath and filling material at one end of the anti-seepage slow-bonding prestressed steel strand, inserting the exposed steel strand into the second closing device, the fixed end pad and the fixed end rubber pad, and forming the steel strand and the extrusion anchor into one piece by extrusion, then connecting the first closing device to the fixed end pad via the fixed end rubber pad, placing filling material in the cavity formed by the fixed end assembly and the fixed end closing device, and bonding and sealing the fixed end closing device and the anti-seepage slow-bonding prestressed steel strand; Step S3: Install other components of the closed anti-seepage prestressed anchor, anchor, pour anchor slurry, and wait for the anchor slurry to reach the designed strength; And step S4, remove the anti-seepage sheath and filling material at the other end of the anti-seepage slow-bonding prestressed steel strand, pass the exposed steel strand through the tensioning end pad, insert the filling material into the cavity formed between the tensioning end pad and the anti-seepage slow-bonding prestressed steel strand, sleeve the tensioning end anchor and the clip anchor on the outer peripheral side of the steel strand for tensioning construction, connect the tensioning end closing device to the tensioning end pad through the tensioning end rubber pad, insert the filling material into the cavity formed by the tensioning end assembly and the tensioning end closing device through the mounting hole, and close the mounting hole.

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