Insertion piece type fixed end anchorage device for wind power tower drum and construction method of insertion piece type fixed end anchorage device

Abstract

The invention discloses an insertion piece type fixed end anchorage device for a wind power tower drum, belongs to the technical field of wind power tower drums, and solves the problem that an existing anchorage device is difficult to realize rapid bundle penetration in a small hole channel. The device comprises a restraint ring, an extrusion sleeve and a plurality of insertion pieces, the inner wall of the restraint ring is conical, the insertion pieces are spliced in parallel to form a conical cylinder, the outer wall of the conical cylinder is matched with the inner wall of the restraint ring, a plurality of semicircular holes are formed in the splicing face of every two adjacent insertion pieces, and after the insertion pieces are spliced, the outer wall of the conical cylinder is matched with the inner wall of the restraint ring. The semicircular holes corresponding to every two adjacent inserting pieces are spliced into a through hole used for allowing a steel strand to penetrate through, the multiple inserting pieces are all inserted into the restraint ring, and the extrusion sleeve is extruded and anchored to the portion, above the inserting pieces, of the steel strand. According to the insertion piece type fixed end anchorage device for the wind power tower drum, a whole bundle of steel strands can penetrate through a hole channel to be anchored, and meanwhile small hole channel and whole bundle penetrating are achieved. The invention further discloses a construction method of the inserting piece type fixed end anchorage device for the wind power tower drum. By means of the method, the construction efficiency can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of wind turbine tower technology, and more specifically, to a plug-in type fixed end anchor for wind turbine towers and its construction method. Background Technology

[0002] With the development of wind power technology, the application of prestressed concrete towers for wind turbines is increasing. The application of prestress is a critical factor in the construction progress of these towers, affecting not only their quality but also the construction schedule. Currently, the main methods used in the market are: Method 1: Using ordinary clamp-type anchors at the top, where a single strand passes through a conical hole and is then anchored with a clamp. Method 2: Whole-strand threading, which involves increasing the diameter of the upper duct, pre-installing the anchor plate, and then anchoring the entire strand through the duct at the top. However, Method 1, with its low efficiency for single-strand threading, cannot meet the construction schedule requirements; Method 2 requires enlarging the duct, which weakens the structural stability. Clearly, both methods and structures have inherent drawbacks.

[0003] Therefore, there is an urgent need to develop and design a plug-in type fixed end anchor for wind turbine towers and its construction method to solve the above-mentioned technical problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a plug-in type fixed end anchor for wind turbine towers, which can anchor the entire bundle of steel strands after passing through the channel, and simultaneously achieve small channel and overall strand passing.

[0005] The second objective of this invention is to provide a construction method for insert-type fixed-end anchors for wind turbine towers, which effectively improves construction efficiency.

[0006] To achieve the first objective mentioned above, the present invention provides a plug-in type fixed end anchor for wind turbine towers, comprising a constraint ring, a compression sleeve, and multiple plugs. The inner wall of the constraint ring is conical. The multiple plugs are arranged side by side to form a conical column whose outer wall is adapted to the inner wall of the constraint ring. The splicing surfaces of adjacent plugs are provided with multiple semi-circular holes. After the multiple plugs are spliced, the semi-circular holes of adjacent plugs are spliced ​​to form a through hole for passing through steel strands. The multiple plugs are all inserted into the constraint ring, and the compression sleeve is compressed and anchored to the steel strands above the plugs.

[0007] As a further improvement, a protective cover is also included, which is detachably mounted in the constraint ring and is filled with an anti-corrosion medium.

[0008] Furthermore, the lower part of the protective cover is provided with a stepped surface, which contacts the insert plate.

[0009] Further, the extrusion sleeve is provided with chamfer at both ends, and the inner wall of one end of the extrusion sleeve is provided with a stepped hole.

[0010] In order to achieve the above-mentioned purpose two, the application provides a wind power tower with a plug-in piece type fixed end anchor construction method, which comprises the following steps:

[0011] S1, stripping the steel strand PE, the stripping length is equal to the length of the extrusion sleeve;

[0012] S2, making a fixed end, extruding the extrusion sleeve to the end of the steel strand;

[0013] S3, making a traction head, clamping the steel strand with the extrusion sleeve to the traction frame, and installing the traction frame to the traction hook;

[0014] S4, installing a constraint ring, putting down the traction cable from the middle of the constraint ring, and connecting the traction hook;

[0015] S5, the traction cable pulls the steel strand through the constraint ring;

[0016] S6, installing the plug-in pieces one by one on the steel strand below the extrusion sleeve, disassembling the traction frame, and completing the installation.

[0017] As a further improvement, the traction frame is composed of a plurality of traction supports, the number of the traction supports is the same as the number of the splicing surfaces of the plug-in pieces, a plurality of support steps with different heights are arranged in each traction support, the height of the adjacent two support steps is not less than the height of the extrusion sleeve, the number of the support steps corresponding to each traction support is the same as the number of the through holes after splicing of the plug-in pieces, and a U-shaped groove is formed on one side of the support steps;

[0018] The step S3 comprises the following specific steps:

[0019] S3.1, respectively clamping the steel strand with the extrusion sleeve along the U-shaped groove to the support steps corresponding to each traction support;

[0020] S3.2, according to the arrangement sequence of the through holes after splicing of the plug-in pieces, sequentially suspending the plurality of traction supports on the traction hook to obtain the traction head;

[0021] The step S6 comprises the following specific steps:

[0022] S6.1, installing the outermost plug-in piece into the constraint ring, aligning the steel strand corresponding to the outermost traction support with the semicircular hole of the plug-in piece, installing another plug-in piece, dismounting the steel strand corresponding to the traction support and placing it on the two plug-in pieces, and taking away the traction support, to complete the installation of one layer of steel strand;

[0023] S6.2, continuing to install the plug-in pieces, sequentially dismounting the steel strand and the traction support layer by layer, until the installation is completed.

[0024] Further, the step S3 further comprises the following steps:

[0025] S3.3, temporarily position a plurality of traction supports or steel strands on the traction hook.

[0026] Further, the traction hook comprises a crossbeam and a hook, a plurality of the traction supports are hung on the crossbeam, the bottom of the hook is connected with one end of the crossbeam, and the top of the hook is bent and extends to the center of the crossbeam.

[0027] Further, in the step S2, when the fixed end is made, the extrusion spring is installed at the end of the steel strand, and then the extrusion sleeve is extruded onto the end of the steel strand.

[0028] Further, the construction method further comprises the following steps:

[0029] S7, install a protective cover, fasten the protective cover to the restraint ring, and extrude the top of the insert piece with the step surface in the protective cover;

[0030] S8, pour the corrosion-resistant medium into the protective cover.

[0031] Advantages

[0032] Compared with the prior art, the present application has the advantages that:

[0033] 1. The insert piece type fixed end anchor for a wind power tower drum of the present application adopts an extrusion sleeve anchoring steel strand mode, which can effectively reduce the diameter of the anchor, and the conical cylinder composed of the insert pieces cooperates with the conical hole of the restraint ring, facilitating the installation and centering of the insert pieces. The whole bundle of steel strands can be anchored after being passed through the hole, realizing the construction process of small hole and prestressed bundle whole bundle threading, improving the tower drum structure strength while shortening the construction period.

[0034] 2. The insert piece type fixed end anchor construction method for a wind power tower drum of the present application adopts a traction head composed of a traction hook and a plurality of traction supports, and the steel strands with extrusion sleeves are combined by the plurality of traction supports, which can make the extrusion sleeves spatially dislocated, realize the smallest envelope circle, and make all the steel strands pass through the embedded hole smoothly, realizing the installation of the prestressed system quickly and orderly, and greatly improving the construction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a structural schematic diagram of the present application;

[0036] Figure 2 is a top view structural schematic diagram of one of the insert pieces of the present application;

[0037] Figure 3 is a top view structural schematic diagram of the insert pieces after splicing of the present application;

[0038] Figure 4 Fig. 1 is a schematic diagram of the three-dimensional structure of the traction head in the present application;

[0039] Figure 5 Fig. 2 is a schematic diagram of the three-dimensional structure of the traction support in the present application;

[0040] Figure 6 Fig. 3 is a schematic diagram of the structure when the insert is installed in the present application.

[0041] Wherein: 1-constraint ring, 2-extrusion sleeve, 3-insert, 4-steel strand, 5-through hole, 6-protective cover, 7-corrosion-resistant medium, 8-step surface, 9-traction hook, 10-traction support, 11-support step, 12-U-shaped groove, 901-cross beam, 902-hook. DETAILED DESCRIPTION

[0042] The present application will be further described below in conjunction with the specific embodiments in the accompanying drawings.

[0043] Reference Figures 1-6 , the insert type fixed end anchor for wind power tower in the present application, comprising constraint ring 1, extrusion sleeve 2 and multiple inserts 3, wherein the inner wall of constraint ring 1 is conical, multiple inserts 3 are juxtaposed and spliced into a conical cylinder with the inner wall of constraint ring 1, and the splicing surface of adjacent two inserts 3 is provided with multiple semicircular holes, after multiple inserts 3 are spliced, the corresponding semicircular holes of adjacent two inserts 3 are spliced into through holes 5 for passing steel strand 4, that is, the insert is a conical cylinder with multiple through holes arranged in a certain rule, and the structure is cut into multiple pieces along the center line of the through hole, so that each through hole is evenly divided into multiple semicircular holes, and the insert 3 is inserted into the constraint ring 1, and the extrusion sleeve 2 extrudes and anchors the steel strand 4 above the insert 3, forming an anchor for the prestressed system.

[0044] The insert type fixed end anchor for wind power tower in the present application adopts the mode of anchoring the steel strand by extrusion sleeve 2, which can effectively reduce the diameter of the anchor, and the conical cylinder composed of multiple inserts 3 cooperates with the conical hole of constraint ring 1, facilitating the installation and centering of the insert, and the whole bundle of steel strands can be anchored after passing through the hole, realizing the construction process of small hole and prestressed bundle whole bundle passing, improving the structural strength of the tower while shortening the construction period.

[0045] Preferably, the anchor of the embodiment further comprises a protective cover 6 which is detachably mounted in the restraining ring 1. Specifically, the inner wall of the protective cover 6 can be provided with internal threads, and the outer wall of the restraining ring 1 can be provided with external threads, so that the protective cover 6 and the restraining ring 1 are connected by threads to achieve detachable mounting. In other embodiments, the protective cover 6 and the restraining ring 1 can also be detachably mounted by screws. In other embodiments, the protective cover 6 can also be mounted on the insert piece 3, such as being connected to the insert piece 3 by screws. The protective cover 6 is filled with anticorrosive medium 7 to achieve the effect of sealing and corrosion protection. Further, the protective cover 6 is a two-section straight cylinder structure, and a stepped surface 8 is provided at the lower part of the protective cover 6. The thickness of the insert piece 3 is greater than the thickness of the restraining ring 1, and the stepped surface 8 is in contact with the insert piece 3. When the protective cover 6 is fastened to the restraining ring 1, the stepped surface 8 extrudes the insert piece 3, so that the conical surface in the restraining ring 1 is in full contact with the insert piece 3, reducing the shaking of the insert piece 3.

[0046] Preferably, the two ends of the extrusion sleeve 2 are provided with chamfers to facilitate the extrusion of the extrusion die sleeve on the extrusion sleeve 2 during the extrusion process, and the inner wall of one end of the extrusion sleeve 2 is provided with a stepped hole for installing the PE steel strand to avoid damage to the PE.

[0047] A construction method of an insert piece type fixed end anchor for a wind power tower, the method comprising the following steps:

[0048] S1, stripping the PE of the steel strand 4, the stripping length being equal to the length of the extrusion sleeve 2;

[0049] S2, making a fixed end, extruding the extrusion sleeve 2 to the end of the steel strand 4 to realize anchoring of the extrusion sleeve 2 on the steel strand 4;

[0050] S3, making a traction head, clamping the steel strand 4 with the extrusion sleeve 2 to the traction frame, and installing the traction frame to the traction hook 9;

[0051] S4, installing the restraining ring 1, lowering the traction cable from the middle of the restraining ring 1, and connecting the traction hook 9;

[0052] S5, the traction cable pulls the steel strand 4 through the restraining ring 1 (as shown in a of Figure 6 );

[0053] S6, installing the insert pieces 3 one by one on the steel strand 4 below the extrusion sleeve 2, and dismounting the traction frame, and the installation is completed.

[0054] In the construction method of the embodiment, the traction frame is composed of a plurality of traction supports 10, the number of the traction supports 10 is the same as the number of the splicing surfaces of the inserts 3, a plurality of support steps 11 with different heights are arranged in each traction support 10, the height of the adjacent two support steps 11 is not less than the height of the extrusion sleeve 2, so as to avoid the problem that all the extrusion sleeves 2 are arranged at the same height and the size is increased, the number of the support steps 11 corresponding to each traction support 10 is the same as the number of the through holes 5 of the inserts 3 after splicing, and a U-shaped groove 12 is formed on one side of the support step 11;

[0055] For example, as shown in Figure 3 and 4 , after the inserts 3 are spliced, there are 5 rows of through holes from left to right, and the number of the 5 rows of through holes is 3, 4, 5, 4 and 3 respectively, so there are 5 traction supports 10 from left to right, and the number of the support steps 11 of the 5 traction supports is 3, 4, 5, 4 and 3 respectively, and they are arranged in one-to-one correspondence, so that after the bundle is penetrated, the position of the steel strand does not need to be combed, the inserts can be installed after the bundle is penetrated, the inserts can be quickly installed, and the construction efficiency is improved;

[0056] The step S3 includes the following specific steps:

[0057] S3.1, respectively, the steel strand 4 with the extrusion sleeve 2 is clamped into the corresponding support step 11 of each traction support 10 along the U-shaped groove 12, so as to limit the extrusion sleeve 2 (as shown in Figure 5 );

[0058] S3.2, according to the arrangement sequence of the through holes 5 of the inserts 3 after splicing, a plurality of traction supports 10 are sequentially hung on the traction hook 9, so as to obtain a traction head (as shown in Figure 4 );

[0059] The step S6 includes the following specific steps:

[0060] S6.1, the outermost insert 3 is installed into the restraint ring 1, the steel strand 4 corresponding to the outermost traction support 10 is aligned with the semicircular hole of the insert 3, another insert 3 is installed, the steel strand 4 corresponding to the traction support 10 is removed and placed on the two inserts 3, the traction support 10 is taken away, and the installation of one layer of steel strand 4 is completed (as shown in b of Figure 6 );

[0061] S6.2, continue to install the inserts 3, sequentially remove the steel strands 4 and the traction supports 10 layer by layer, until the installation is completed (as shown in c of Figure 6 ).

[0062] Preferably, the step S3 further includes the following steps:

[0063] S3.3, temporarily position the plurality of traction supports 10 or steel strands 4 on the traction hook 9.

[0064] Specifically, the plurality of traction supports 10 or steel strands 4 can be temporarily positioned by setting a closed buckle on the traction hook 9, such as a crane hook, which locks the traction support 10 in the traction hook 9. Alternatively, the plurality of traction supports 10 or steel strands 4 can be tied on the traction hook 9 by a rope. Temporarily positioning the plurality of traction supports 10 or steel strands 4 avoids the problem of the traction support 10 slipping out of the traction hook 9 during traction.

[0065] Preferably, the traction hook 9 includes a crossbeam 901 and a hook 902, wherein the plurality of traction supports 10 are hung on the crossbeam 901, the bottom of the hook 902 is connected to one end of the crossbeam 901, and the top of the hook 902 extends towards the center of the crossbeam 901, so that the traction point of the hook 902 tends to the center of gravity of the entire traction head, facilitating traction. The crossbeam 901 can be inclined to one side of the hook 902, or a step or positioning groove can be provided on the crossbeam 901 to temporarily position the plurality of traction supports 10, avoiding the problem of the traction support 10 slipping out of the traction hook 9 during traction.

[0066] Preferably, in step S2, the extrusion spring is installed at the end of the steel strand 4 before the extrusion sleeve 2 is extruded onto the end of the steel strand 4. The extrusion spring is a product in the prior art, such as the extrusion ring disclosed in the patent technology of CN 107035075A. In this embodiment, the extrusion spring is added in the gap between the steel strand and the inner hole of the extrusion sleeve, further improving the extrusion anchoring stability and shortening the anchoring length of the extrusion sleeve.

[0067] Preferably, the construction method further comprises the following steps:

[0068] S7, installing the protective cover 6, fastening the protective cover 6 to the restraint ring 1, so that the step surface 8 in the protective cover 6 extrudes the top of the insertion piece 3, which can make the restraint ring 1 fit the insertion piece 3 more closely and prevent the insertion piece 3 from loosening;

[0069] S8, pouring the corrosion-resistant medium 7 into the protective cover 6 to achieve sealing and corrosion protection of the anchorage device.

[0070] The above is only a preferred embodiment of the present application, and it should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which will not affect the effect of the implementation of the present application and the practicality of the patent.

Claims

1. A type insert-type fixed end anchor for wind turbine towers, characterized in that, The device includes a constraint ring (1), a compression sleeve (2), and multiple inserts (3). The inner wall of the constraint ring (1) is conical. The multiple inserts (3) are spliced ​​side by side to form a conical column whose outer wall is adapted to the inner wall of the constraint ring (1). The splicing surfaces of two adjacent inserts (3) are provided with multiple semi-circular holes. After the multiple inserts (3) are spliced, the semi-circular holes corresponding to two adjacent inserts (3) are spliced ​​to form a through hole (5) for inserting steel strands (4). The multiple inserts (3) are inserted into the constraint ring (1). The compression sleeve (2) is compressed and anchored on the steel strands (4) above the inserts (3).

2. The insert-type fixed end anchor for wind turbine towers according to claim 1, characterized in that, It also includes a protective cover (6), which is detachably installed in the constraint ring (1), and the protective cover (6) is filled with an anti-corrosion medium (7).

3. The insert-type fixed end anchor for wind turbine towers according to claim 2, characterized in that, The lower part of the protective cover (6) is provided with a stepped surface (8), which is in contact with the insert (3).

4. The insert-type fixed end anchor for wind turbine towers according to claim 1, characterized in that, The extrusion sleeve (2) has chamfers at both ends, and a stepped hole is provided on the inner wall of one end of the extrusion sleeve (2).

5. A construction method for a plug-in type fixed end anchor for wind turbine towers according to any one of claims 1-4, characterized in that, The method includes the following steps: S1. Strip the steel strand (4)PE, the stripping length is equal to the length of the extrusion sleeve (2); S2. Make a fixed end by pressing the extrusion sleeve (2) to the end of the steel strand (4); S3. Make a traction head, attach the steel strand (4) with the compression sleeve (2) to the traction frame, and install the traction frame onto the traction hook (9); S4. Install the restraint ring (1), lower the traction cable from the middle of the restraint ring (1), and connect the traction hook (9); S5. The traction cable pulls the steel strand (4) through the constraint ring (1); S6. Install the inserts (3) one by one on the steel strands (4) below the extrusion sleeve (2), disassemble the traction frame, and the installation is complete.

6. The construction method according to claim 5, characterized in that, The traction frame is composed of multiple traction brackets (10). The number of traction brackets (10) is the same as the number of splicing surfaces of the insert (3). Each traction bracket (10) is provided with multiple support steps (11) of different heights. The height of two adjacent support steps (11) is not less than the height of the extrusion sleeve (2). The number of support steps (11) corresponding to each traction bracket (10) is the same as the number of through holes (5) after splicing the insert (3). A U-shaped groove (12) is opened on one side of each support step (11). Step S3 includes the following specific steps: S3.

1. Insert the steel strand (4) with the compression sleeve (2) into the corresponding support step (11) of each traction bracket (10) along the U-shaped groove (12); S3.

2. According to the arrangement order of the through holes (5) after the splicing of the inserts (3), hang multiple traction brackets (10) on the traction hook (9) in sequence to obtain the traction head; Step S6 includes the following specific steps: S6.1 Install the outermost insert (3) into the constraint ring (1), align the steel strand (4) corresponding to the outermost traction bracket (10) with the semi-circular hole of the insert (3), and install another insert (3). Remove the steel strand (4) corresponding to the traction bracket (10) and place it on the two inserts (3). Remove the traction bracket (10) to complete the installation of one layer of steel strand (4). S6.2 Continue installing the insert (3), and remove the steel strand (4) and traction bracket (10) in sequence until the installation is complete.

7. The construction method according to claim 6, characterized in that, Step S3 further includes the following steps: S3.3 Temporarily limit multiple traction brackets (10) or steel strands (4) on the traction hook (9).

8. The construction method according to claim 6, characterized in that, The traction hook (9) includes a crossbeam (901) and a hook (902), and a plurality of the traction brackets (10) are suspended on the crossbeam (901). The bottom of the hook (902) is connected to one end of the crossbeam (901), and the top of the hook (902) extends and bends toward the center of the crossbeam (901).

9. The construction method according to claim 5, characterized in that, In step S2, when making the fixed end, after the compression spring is installed on the end of the steel strand (4), the compression sleeve (2) is then pressed onto the end of the steel strand (4).

10. The construction method according to claim 5, characterized in that, The construction method also includes the following steps: S7. Install the protective cover (6) and fasten the protective cover (6) to the constraint ring (1) so that the step surface (8) inside the protective cover (6) presses against the top of the insert (3); S8. Pour anti-corrosion medium (7) into the protective cover (6).

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