Anchor bolt double sheath and use method

Abstract

The present invention relates to an anchor bolt double sheath and a use method thereof, which is used for protecting an anchor bolt arranged on a foundation. The anchor bolt double sheath comprises an upper sheath (7) and a lower sheath (6), wherein one end of the upper sheath (7) is open, and both ends of the lower sheath (6) are open, wherein the upper sheath (7) and the lower sheath (6) are both provided with threads inside and are sleeved on the anchor bolt, wherein a first cavity (10) is formed between the lower sheath (6), the anchor bolt and the foundation, and a second cavity (13) is formed between the upper sheath (7), the lower sheath (6) and the anchor bolt, and an inlet and outlet hole (9) is provided on the lower sheath (6) for connecting the first cavity (10) and the second cavity (13). Compared with the prior art, the present invention has the advantages of good anti-loosening performance, good sealing performance, long service life and the like.

Description

Technical Field

[0001] The invention relates to an anchor bolt protection technology, in particular to an anchor bolt double sheath and a use method thereof. Background Art

[0002] In the past, buried towers were commonly used to connect pile foundation caps and towers in offshore wind turbine foundations. However, this type of connection uses a large amount of steel and is expensive. Welding at complex workstations on site is not easy to ensure quality, which affects fatigue resistance. Prestressed anchor bolt connection has superior structural performance, saves cost, and keeps the cap concrete permanently under pressure, which has good durability and is more competitive. However, the part of the upper end of the prestressed anchor bolt exposed to the cap surface is susceptible to corrosion by seawater and marine atmosphere. The original anti-corrosion measures of onshore wind turbine foundations cannot meet the durability requirements of the offshore environment. In view of this situation, it is necessary to study the protection measures of prestressed anchor bolts for offshore wind turbine foundations so that anchor bolts can be used in the special environment of offshore wind turbine foundations.

[0003] The prior art also provides some solutions. Chinese patent CN201920925417.7 proposes an anchor bolt thread protection sleeve for protecting the connecting nut of the anchor bolt and the exposed section of the anchor bolt, including a nut protection part and a bolt protection part. The nut protection part has a first cavity, and the first cavity is used to accommodate the connecting nut of the anchor bolt. One end of the bolt protection part is fixedly connected to the nut protection part, and the bolt protection part has a second cavity, which is axially connected to the first cavity. The other end of the bolt protection part is closed, and the second cavity is provided with an internal thread, which is used to connect with the exposed section of the anchor bolt. The internal thread in the anchor bolt thread protection sleeve is connected with the external thread of the exposed section of the anchor bolt, which can ensure that the protective sleeve is reliably connected to the anchor bolt and avoid the protective sleeve being blown away by the wind, resulting in the failure of the protection of the anchor bolt. However, this patent is only connected to the exposed section of the anchor bolt through the internal thread in the second cavity, which is easy to loosen, resulting in poor anti-loosening and sealing performance of the protective sleeve. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide an anchor bolt double sheath and a use method, which has good anti-loosening performance and sealing performance and long service life.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A double anchor sleeve is used to protect the anchor installed on the foundation, including an upper sleeve and a lower sleeve, wherein the upper sleeve is open at one end and the lower sleeve is open at both ends, the upper sleeve and the lower sleeve are both provided with threads matching the anchor and are sleeved on the anchor, a first cavity is formed between the lower sleeve, the anchor and the foundation, a second cavity is formed between the upper sleeve, the lower sleeve and the anchor, and the lower sleeve is provided with an inlet and outlet hole connecting the first cavity and the second cavity.

[0007] Furthermore, the lower sheath comprises a first side surface, a first end surface and a second side surface which are connected in sequence, each connection point is chamfered, the thread is arranged on the inner side of the first side surface, and the first end surface, the second side surface and the base together constitute a first cavity;

[0008] The upper sleeve includes a second end face, a third side face, a third end face and a fourth side face which are connected in sequence, each connection is chamfered, the thread is arranged on the inner side of the third side face, and a second vertical plate extends downward from the connection between the third side face and the third end face, and the second vertical plate, the fourth side face and the lower sleeve together constitute a second cavity.

[0009] Furthermore, a first vertical plate is disposed on the first end surface, the first vertical plate, the first side surface and the first end surface form an annular groove, and the outer side of the first vertical plate is in close contact with the inner side of the fourth side surface.

[0010] Furthermore, the inlet and outlet holes are evenly distributed on the first end face of the annular groove, and the number of the inlet and outlet holes is not less than 2, so that the protective liquid can be injected into the first cavity from one of the inlet and outlet holes. After the first cavity is filled, the protective liquid overflows from the remaining inlet and outlet holes, indicating that the first cavity is full of the protective liquid. After the first cavity is full, the protective liquid is injected into the annular groove again, so that the annular groove can store the protective liquid, and the protective liquid is continuously replenished into the first cavity through the inlet and outlet holes. The first cavity is always full of the protective liquid to avoid the loss of the protective liquid and continuously protect the anchor bolt.

[0011] Furthermore, an elastic ring is provided on the second side surface. The elastic ring is made of aging-resistant engineering foam plastics to improve sealing performance and prevent the protection liquid in the first cavity from being lost.

[0012] Furthermore, the materials of the upper and lower sheaths are both engineering plastics, which can be injection molded, are easy to process, and have the advantages of heat resistance, cold resistance, UV resistance, durability and corrosion resistance. The engineering plastics include polysulfone PSU, polycarbonate PC, epoxy resin plastic EP or polychlorotrifluoroethylene F3.

[0013] Furthermore, the protective liquid adopts harder butter.

[0014] A method for using a double sheath of an anchor bolt, specifically comprising:

[0015] The lower sheath is inserted from one end of the anchor bolt and pressed against the foundation through the elastic ring, and the protective liquid is injected into the first cavity through the inlet and outlet holes to fill the first cavity with the protective liquid. The upper sheath is inserted from one end of the anchor bolt and is tightly attached to the lower sheath.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention protects the anchor bolt by a lower sheath and an upper sheath. The lower sheath and the upper sheath are both provided with threads. One end of the upper sheath is open, and both ends of the lower sheath are open. The lower sheath is sleeved on the anchor bolt, and the anchor bolt passes through the lower sheath. Then the upper sheath is sleeved on the anchor bolt to protect the anchor bolt together. The anchor bolt has good anti-loosening and sealing properties and is prevented from intrusion by water vapor and salt mist. At the same time, a first cavity is formed between the lower sheath, the anchor bolt and the foundation, and a second cavity is formed between the upper sheath, the lower sheath and the anchor bolt. The lower sheath is provided with an inlet and outlet hole connecting the first cavity and the second cavity. After injecting the protective liquid into the first cavity through the inlet and outlet holes, the upper sleeve is screwed in. The operation is convenient. The protective liquid can flow between the first cavity and the second cavity, which can solve the problem of protective liquid loss caused by thermal expansion and contraction. At the same time, a certain amount of protective liquid can be injected into the upper sleeve in advance, and then the upper sleeve is screwed in, so that the second cavity is prepared with protective liquid. When the protective liquid in the first cavity is lost, the protective liquid in the second cavity is supplemented to the first cavity through the inlet and outlet holes. The first cavity is always in a full state, which fully protects the anchor bolt and has a long service life.

[0018] (2) The first side surface, the first end surface and the second side surface are connected in sequence to form a lower sheath. An elastic ring is provided on the second side surface. The elastic ring is made of engineering foam plastic, which can improve the sealing of the first cavity and prevent the protective liquid from losing too quickly.

[0019] (3) The present invention is provided with a first vertical plate on the first end surface, and the first vertical plate, the first side surface and the first end surface form an annular groove. The first vertical plate is in close contact with the upper sleeve, so that after the first cavity is filled with the protective liquid, the reserved protective liquid is injected into the annular groove. The operation is simple and the protective liquid will not be lost during the operation. At the same time, the sealing performance of the contact position between the upper sleeve and the lower sleeve is improved, and the sealing performance of the second cavity is improved, so as to prevent the protective liquid in the second cavity from being lost.

[0020] (4) The present invention is provided with no less than two inlet and outlet holes, so that when the protective liquid is injected into the first cavity, it is convenient to inject it through one of the inlet and outlet holes. When the first cavity is filled, the air and the protective liquid are discharged from the other inlet and outlet holes, indicating that the first cavity has been filled. The operation is simple and convenient, and it is ensured that the first cavity is filled with the protective liquid to fully protect the anchor bolt.

[0021] (5) The present invention adopts engineering plastic injection molding upper and lower sheaths, which are easy to process and have good durability and corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-sectional view of the present invention;

[0023] Figure 2 is a side view of the upper sheath;

[0024] Figure 3 is a side view of the lower sheath;

[0025] Figure 4 is a top view of the lower sheath;

[0026] Description of the numbers in the figure:

[0027] 1. Prestressed anchor bolt, 2. Nut, 3. Washer, 4. Upper anchor plate, 5. Foundation concrete, 6. Lower sleeve, 7. Upper sleeve, 8. Elastic ring, 9. Inlet and outlet holes, 10. First cavity, 11. Annular groove, 12. First vertical plate, 13. Second cavity, 61. First side surface, 62. First end surface, 63. Second side surface, 71. Second end surface, 72. Third side surface, 73. Third end surface, 74. Fourth side surface, 75. Second vertical plate. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0029] Example 1

[0030] A double anchor sheath for protecting a prestressed anchor 1, such as Figure 1 , one end of the prestressed anchor bolt 1 extends from the foundation concrete 5 and passes through the nut 2, the upper anchor plate 4, the gasket 3 and the nut 2 in sequence, and is in a tensioned state. The double sheath of the anchor bolt includes an upper sheath 7 and a lower sheath 6;

[0031] like Figure 3 The lower sheath 6 includes a first side surface 61, a first end surface 62 and a second side surface 63 which are connected in sequence, and a chamfer is provided at the connection. The inner side of the first side surface 61 is provided with an internal thread matching the prestressed anchor bolt 1, and a first vertical plate 12 is vertically provided on the first end surface 62. The first vertical plate 12, the first side surface 61 and the first end surface 62 together constitute an annular groove 11, and an elastic ring 8 is provided at one end of the second side surface 63. The first side surface 61 is sleeved on the prestressed anchor bolt 1, and the elastic ring 8 is tightly attached to the upper anchor plate 4; Figure 4 Four inlet and outlet holes 9 are evenly opened on the first end surface 62 in the annular groove 11.

[0032] like Figure 2The upper sleeve 7 includes a second end face 71, a third side face 72, a third end face 73 and a fourth side face 74 which are connected in sequence. A chamfer is provided at the connection. The inner side of the third side face 72 is provided with an internal thread matching the prestressed anchor bolt 1. The third side face 72 extends a second vertical plate 75 downward at the connection with the third end face 73. The cross-sectional diameter of the third side face 72 is the same as that of the first side face 61. The third side face 72 is sleeved on the prestressed anchor bolt 1. One end of the third side face 72 is tightly attached to one end of the first side face 61 to form a first cavity 10. One end of the second side face 63 is tightly attached to the first end face 62. The inner side of the second side face 63 is tightly attached to the outer side of the first vertical plate 12 to form a second cavity 13. The inlet and outlet holes 9 connect the first cavity 10 and the second cavity 13.

[0033] Butter is injected into the first cavity 10 through one of the inlet and outlet holes 9. When the first cavity 10 is full of butter, the butter overflows from the other inlet and outlet holes 9, indicating that it is full. At this time, butter is injected into the annular groove 11. The annular groove 11 can store a certain amount of butter. Then the upper sleeve 7 is screwed in, and the second vertical plate 75 is connected to the first vertical plate 12 and fits tightly. The annular groove 11 can store butter and continuously add protective liquid to the first cavity 10 through the inlet and outlet holes 9. The first cavity 10 is always full of butter to avoid butter loss and continuously protect the prestressed anchor bolt 1.

[0034] The materials of the upper sheath 7 and the lower sheath 6 are both engineering plastics, which have the advantages of heat resistance, cold resistance and UV resistance. The engineering plastics include polysulfone PSU, polycarbonate PC, epoxy resin EP or polytrifluorochloroethylene F3. The material of the elastic ring 8 is aging-resistant engineering foam plastic with good sealing performance to prevent butter from leaking from the first cavity 10.

[0035] Example 2

[0036] A method for using a double sheath of an anchor bolt corresponding to Example 1 is as follows:

[0037] One end of the prestressed anchor bolt 1 extends from the foundation concrete 5 and passes through the nut 2, the upper anchor plate 4, the gasket 3 and the nut 2 in sequence to complete the tensioning;

[0038] The lower sheath 6 is inserted from one end of the prestressed anchor bolt 1 and pressed against the upper anchor plate 4 through the elastic ring 8. A harder butter is injected from one of the inlet and outlet holes 9 until the butter overflows from the other three inlet and outlet holes 9, indicating that the butter fills the first cavity 10. Then the annular groove 11 is filled with butter. The annular groove 11 can store butter and continuously replenish the protective liquid to the first cavity 10 through the inlet and outlet holes 9. The first cavity 10 is always filled with butter to prevent butter loss and continuously protect the prestressed anchor bolt 1.

[0039] The upper sleeve 7 is inserted from one end of the prestressed anchor bolt 1 and the second vertical plate 75 is aligned and tightly attached to the first side surface 61, completing the installation of the lower sleeve 6 and the upper sleeve 7. The upper sleeve 7 and the lower sleeve 6 play a role in preventing loosening and protecting the butter in the lower sleeve 6.

[0040] When the prestressed anchor bolt 1 is inspected and re-tensioned, the upper sheath 7 and the lower sheath 6 are removed in sequence. After the inspection or re-tensioning is completed, the lower sheath 6 and the upper sheath 7 are installed in sequence. The disassembly is simple and does not hinder the inspection and re-tensioning of the prestressed anchor bolt 1.

[0041] Embodiment 1 and embodiment 2 propose a double anchor jacket and a method of use, which can not only place the prestressed anchor 1 in a butter-sealed space to protect it from erosion by water vapor and salt spray, but also the double anchor jacket has good durability and resistance to corrosion in the marine environment, and the protective measures are easy to install and do not affect the subsequent inspection and re-tensioning of the prestressed anchor 1.

[0042] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A method for using a double anchor sheath for protecting an anchor bolt arranged on a foundation, characterized in that: The anchor bolt double sheath comprises an upper sheath (7) and a lower sheath (6); the upper sheath (7) is open at one end, and the lower sheath (6) is open at both ends; the upper sheath (7) and the lower sheath (6) are both provided with threads inside and are sleeved on the anchor bolt; a first cavity (10) is formed between the lower sheath (6), the anchor bolt and the foundation; a second cavity (13) is formed between the upper sheath (7), the lower sheath (6) and the anchor bolt; and an inlet and outlet hole (9) is formed on the lower sheath (6) for connecting the first cavity (10) and the second cavity (13). The lower jacket (6) comprises a first side surface (61), a first end surface (62) and a second side surface (63) which are connected in sequence, the thread is arranged on the inner side of the first side surface (61), and the first end surface (62), the second side surface (63), the anchor bolt and the foundation together form a first cavity (10). The first end surface (62) is provided with a first vertical plate (12), the first vertical plate (12), the first side surface (61) and the first end surface (62) form an annular groove (11), and the first vertical plate (12) is closely attached to the upper sleeve (7). The upper sleeve (7) comprises a second end face (71), a third side face (72), a third end face (73) and a fourth side face (74) which are connected in sequence, and the thread is arranged on the inner side of the third side face (72). A second vertical plate (75) extends downward from the connection between the third side surface (72) and the third end surface (73); the second vertical plate (75), the fourth side surface (74) and the lower sleeve (6) together form a second cavity (13). The method for using the double anchor sleeve is as follows: the lower sleeve (6) is inserted from one end of the anchor and pressed against the foundation through the elastic ring (8); a protective liquid is injected into the first cavity (10) through the inlet and outlet hole (9) so that the protective liquid fills the first cavity (10); and the upper sleeve (7) is inserted from one end of the anchor and is tightly attached to the lower sleeve (6).

2. A method for using a double sheath of an anchor bolt according to claim 1, characterized in that: An elastic ring (8) is provided on the second side surface (63).

3. A method for using a double sheath of an anchor bolt according to claim 2, characterized in that: The elastic ring (8) is made of engineering foam plastic.

4. A method for using a double sheath of an anchor bolt according to claim 1, characterized in that: The number of the inlet and outlet holes (9) is not less than 2.

5. The method for using the double sheath of an anchor bolt according to claim 1, characterized in that: The upper sheath (7) and the lower sheath (6) are both made of engineering plastics.

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