Anchorage device sealing connection joint for prestressed tendon and construction method

Abstract

The invention discloses an anchorage device sealing connection joint for prestressed tendons and a construction method. The connection joint comprises a sealing adapter, a connector and an outer sealing ring arranged on an outer ring of the sealing adapter in a sleeving mode. The sealing adapter comprises a straight tube section and a conical section which are fixedly connected; the conical section extends outwards from one end of the straight barrel section and is located in the anchor bearing plate, and the outer wall size of the conical section is matched with the inner wall size of the small opening end of the anchor bearing plate. The straight tube section is positioned outside the small-opening end of the anchor backing plate and an outer ring is provided with an external thread structure; one end of the connector is provided with a matched internal thread structure, and the other end of the connector is connected with one end of the prestressed pipeline; the outer sealing ring is installed between the small opening end of the anchor bearing plate and the opposite end face of the connector. According to the anchorage device sealing connection joint for the prestressed tendon and the construction method, the sealing performance and the stability of a sealing structure can be improved, and the stability of a connection structure is improved.

Description

Technical Field

[0001] The invention relates to the technical field of anchor sealing, and in particular to an anchor sealing connection joint for prestressed tendons and a construction method. Background Art

[0002] In traditional post-tensioning, bonded prestressed tendons are placed in prestressed pipes. Prestressed pipes are generally made of metal or plastic bellows. Metal bellows are formed by rolling and pressing metal steel strips. The sealing performance of plastic bellows is better than that of metal bellows, and it can also isolate the electrochemical reaction ratio in the structure. Therefore, the sealing and isolation performance of plastic bellows is used to enhance the connection between the anchor plate and the anchor head, which can enhance the sealing performance of the anchor head and the prestressed duct, thereby improving the corrosion resistance of the prestressed tendons.

[0003] In the existing sealing construction method, an intermediate piece is usually used to connect the anchor plate and the corrugated pipe, and a heat shrink sleeve on the outer ring of the connection is used for sealing. For example, Chinese patent CN106835985A discloses an electrically isolated prestressed anchoring system and its construction and installation method, wherein an insulating inner sleeve is installed in the anchor plate, and the outer diameter of the insulating inner sleeve matches the inner diameter of the anchor plate. Its small end has an extension section for connecting with a connector to facilitate connection with the connector. The insulating inner sleeve is connected to the insulating corrugated pipe through the insulating connector, and the three are connected specifically through a heat shrink sleeve. A heat shrink sleeve for sealing is installed at the contact between the insulating inner sleeve and the small end face of the anchor plate and the insulating connector, and at the contact between the insulating corrugated pipe and the insulating connector. This anchoring system only uses a heat shrink sleeve to achieve a relatively fixed connection and sealing effect between the anchor plate and the connector, and between the connector and the prestressed pipe. During use, the sealing structure is prone to fall off, resulting in failure of the connection structure and the sealing structure. Summary of the invention

[0004] In view of the above problems, the present invention provides a sealed connection joint and construction method for prestressed tendons, aiming to solve the problems in the prior art that the connection and sealing between the anchor plate and the connecting head, and between the connecting head and the prestressed pipe are only carried out by heat shrink sleeves, which are easy to fall off during use, resulting in failure of the connection structure and the sealing structure.

[0005] The present invention adopts the following technical solutions to achieve the above purpose:

[0006] A sealing connection joint for anchors for prestressed tendons, used for connecting an anchor plate and a prestressed pipe; the connection joint comprises a sealing adapter, a connector, and an outer sealing ring sleeved on the outer ring of the sealing adapter; the sealing adapter comprises a straight section and a tapered section that are fixedly connected; the tapered section extends outward from one end of the straight section, the tapered section is located inside the anchor plate and the outer wall size is adapted to the inner wall size of the small end of the anchor plate; the straight section is located outside the small end of the anchor plate and the outer ring is provided with an external thread structure; one end of the connector is provided with an internal thread structure that matches the external thread structure, and the other end is connected to one end of the prestressed pipe; the outer sealing ring is also interference fit with the end face of the small end of the anchor plate and the end face of the connector.

[0007] In the present technical solution, when the connector and the sealing adapter are connected through a threaded structure, the connector moves toward the small end of the anchor plate, and the end face of the small end of the anchor plate and the end face of the connector clamp the outer sealing ring, while driving the outer wall of the tapered section of the sealing adapter to fit tightly against the inner wall of the small end of the anchor plate. On the one hand, this can ensure the stability of the connection between the anchor plate and the prestressed pipe, and on the other hand, it can improve the sealing performance between the connector and the anchor plate.

[0008] A further technical solution is that it also includes an inner sealing ring, the outer wall of the tapered section is provided with a groove, and the inner sealing ring is interference fit with the groove and the inner wall of the anchor pad. In this technical solution, after the connection structure is installed, the outer wall of the tapered section of the sealing adapter is tightly attached to the inner wall of the small end of the anchor pad, and the inner sealing ring can further improve the stability of the anchoring system.

[0009] A further technical solution is to further include a heat shrink sleeve, which is arranged on the small end of the anchor plate, the connector and the outer ring of the prestressed pipe. In this technical solution, the heat shrink sleeve can further improve the stability and sealing of the anchoring system.

[0010] A further technical solution is that the inner wall of the conical section is provided with an arc surface inclined along the divergent direction of the prestressed tendons. The arc surface design of this technical solution can prevent the sealing adapter from contacting the prestressed tendons.

[0011] A further technical solution is that the pipe mouth of the prestressed pipe is inserted into the interior of the connector, and an interference-fit pipe sealing ring is provided between the outer wall of the pipe mouth and the inner wall of the connector.

[0012] A further technical solution is that the prestressed pipe is a bamboo bellows, and the connection structure between the bamboo bellows and the connector includes a block sleeved between two wave peaks at the end of the bamboo bellows to be connected, a positioning block sleeved outside the block, a fixing bolt that penetrates the positioning block and is threadedly connected to the connector, and a pipe sealing ring that matches the end face of the bamboo bellows pipe mouth; the outer wall of the block is provided with a support step with the support surface facing away from the connector, and the outer wall of the block is also provided with a positioning section along the support surface, the positioning block is sleeved on the outer ring of the positioning section and the end face abuts against the support step; the end face of one end of the connector connected to the prestressed pipe is provided with a sink for installing the pipe sealing ring, and the inner diameter of the sink is smaller than the outer diameter of the bamboo bellows pipe mouth; the pipe sealing ring is interference fit with the sink and the end face of the bellows pipe mouth. In this technical solution, the connector is connected to the prestressed pipe by bolts, and is sealed by clamping the pipe sealing ring, which can further improve the stability and sealing of the connection structure between the connector and the prestressed pipe.

[0013] A sealing construction method for anchoring a prestressed tendon comprises the following steps:

[0014] A) Place anchor plates and spiral reinforcement on the formwork of the prestressed concrete structure to be poured;

[0015] B) installing the sealing adapter from the large end of the anchor plate to the inside of the anchor plate, wherein the sealing adapter comprises a tapered section and a straight section with external threads, wherein the tapered section fits the inner wall of the small end of the anchor plate, and the straight section passes through the small end of the anchor plate;

[0016] C) Install the outer sealing ring and put it on the outer ring of the straight tube section;

[0017] D) Installing a connector, wherein the first end of the connector is provided with an internal thread structure matching with the external thread of the straight tube section, and the second end is provided with a connection structure matching with the prestressed pipe, and the first end of the connector is threadedly connected with the external thread of the straight tube section through the internal thread until the end face of the connector and the end face of the small end of the anchor plate clamp the outer sealing ring;

[0018] E) Install the prestressed pipe and connect the prestressed pipe to the second end of the connector.

[0019] In the present technical scheme, the internal thread structure at the first end of the connector is installed in cooperation with the external thread structure of the sealing adapter. When the connector is rotated until its end face and the end face of the small end of the anchor plate clamp the outer sealing ring, the sealing adapter moves relative to the anchor plate toward the connector, so that the tapered section of the sealing adapter is in close contact with the inner wall of the small end of the anchor plate, thereby improving the stability and sealing performance of the connection between the anchor plate and the connector. On the one hand, the present technical scheme replaces the traditional heat shrink sleeve method by clamping the sealing ring with two components, thereby further improving the sealing performance and the stability of the sealing structure. On the other hand, the sealing adapter replaces the inner sleeve in the prior art, so that the sealing adapter and the anchor plate, as well as the anchor plate and the connector are connected in a tight fit, thereby further improving the stability of the connection structure.

[0020] A further technical solution is that a groove is provided on the outer wall of the tapered section of the sealing adapter; before step B), the step also includes: step B0) installing an inner sealing ring, and sleeves the inner sealing ring in the groove of the outer ring of the tapered section. In this technical solution, when the outer wall of the tapered section is in close contact with the inner wall of the small end of the anchor pad, the groove and the inner wall of the anchor pad clamp the inner sealing ring, which can further improve the sealing performance.

[0021] A further technical solution is that the prestressed pipe is a bamboo bellows; the connection structure at the second end of the connector includes a sink located on the end surface and two or more threaded holes evenly distributed in the circumferential direction; a clamping block is sleeved between the two wave peaks at the end of the prestressed pipe, and a positioning block is sleeved on the outer ring of the prestressed pipe, and the positioning block is provided with a through hole matching the threaded hole; wherein the clamping block is provided with a supporting step with a supporting surface facing away from the connector, and the end surface of the positioning block matches the supporting step; the step E) includes:

[0022] E1) Install the pipe sealing ring into the sink at the second end of the connector;

[0023] E2) Install the positioning block, and sleeve the positioning block on the outer ring of the prestressed pipe with the clamping block, so that the end surface of the positioning block abuts against the supporting surface of the supporting step;

[0024] E3) Fix the prestressed pipe, align the pipe mouth of the prestressed pipe with the pipe sealing ring, pass the fixing bolt through the through hole of the positioning block and thread it with the threaded hole corresponding to the second end of the connector, so that the pipe mouth of the prestressed pipe and the sinker clamp the pipe sealing ring.

[0025] In the present technical scheme, the positioning block is connected to the second end of the connector by a fixing bolt, and the positioning block drives the clamping block to move toward the second end of the connector by rotating the fixing bolt, and the clamping block pushes the wave crest of the bamboo tube to press the pipe mouth of the prestressed pipe against the pipe sealing ring installed on the end face of the second end of the connector; on the one hand, the traditional heat shrink sleeve method is replaced by the fixing bolt and the threaded hole method, so as to further improve the structural stability of the connector and the prestressed pipe; on the other hand, the sealing method of the heat shrink sleeve is replaced by the method of clamping the sealing ring on the end faces of the two components, so as to further improve the sealing performance between the connector and the prestressed pipe.

[0026] A further technical solution is that the block includes two semicircular structures, the inner wall of which cooperates with the outer ring of the prestressed pipe after splicing, and the outer wall is provided with a positioning section facing the supporting surface of the supporting step, and the outer diameter of the positioning section is adapted to the inner diameter of the positioning block; the step E2) includes:

[0027] E20) Install the clamping block to splice the two semicircular structures outside the corresponding position of the prestressed pipe;

[0028] E21) The positioning block is sleeved on the outer ring of the positioning section of the clamping block along the axial direction of the prestressed pipe, so that the inner wall of the clamping block is in close contact with the outer wall of the prestressed pipe, and the end face of the positioning block is in contact with the supporting surface of the supporting step.

[0029] The technical solution makes the card block into a spliced ​​split structure, fixes it with a positioning block, and uses a nested card position mortise and tenon method to facilitate installation and construction, thereby further improving the structural stability.

[0030] The beneficial effects of the present invention are:

[0031] The present invention provides a sealing connection joint and construction method for an anchor for prestressed tendons. The internal thread structure at the first end of the connecting head is installed in cooperation with the external thread structure of the sealing adapter. When the connecting head is rotated until its end face and the end face of the small end of the anchor plate clamp the outer sealing ring, the sealing adapter moves relative to the anchor plate toward the connecting head, so that the tapered section of the sealing adapter is in close contact with the inner wall of the small end of the anchor plate, thereby improving the stability and sealing performance of the connection between the anchor plate and the connecting head. On the one hand, the sealing ring is clamped by two components to replace the traditional heat shrink sleeve method, thereby further improving the sealing performance and stability of the sealing structure. On the other hand, the sealing adapter replaces the inner sleeve in the prior art, so that the sealing adapter and the anchor plate, as well as the anchor plate and the connecting head are connected in a tight fit, thereby further improving the stability of the connection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 : A schematic diagram of the application of the sealed connection joint for the anchor for prestressed tendons according to the present invention.

[0033] Figure 2 Schematic diagram of the installation of the sealing adapter and the anchor plate of the present invention.

[0034] Figure 3 : A schematic diagram of the structure of the sealing adapter of the present invention.

[0035] Figure 4 : A schematic diagram of the installation of the sealing adapter and the connector according to the present invention.

[0036] Figure 5 : A schematic diagram of the structure of the connector of the present invention.

[0037] Figure 6 Schematic diagram of the installation of the prestressed pipe and the connector according to the present invention.

[0038] Figure 7 Schematic diagram of the installation of the spiral corrugated pipe and the connector according to the present invention.

[0039] Figure 8 Schematic diagram of the installation of the bamboo-section corrugated pipe and the connector according to the present invention.

[0040] Fig. 9 : A schematic diagram of the structure of a connector with threaded holes according to the present invention.

[0041] Fig.10 : A schematic diagram of the card block structure of the present invention.

[0042] Fig.11 : A schematic diagram of the positioning block structure of the present invention.

[0043] In the figure:

[0044] 1. Anchor plate; 11. Large end; 12. Small end; 2. Sealing adapter; 21. Conical section; 22. Straight section; 20. Groove; 31. Outer sealing ring; 32. Inner sealing ring; 33. Pipe sealing ring; 4. Connector; 40. Step; 41. First end of connector; 42. Second end of connector; 420. Threaded hole; 421. Sink; 5. Prestressed pipe; 51. Block; 511. Support step; 512. Positioning section; 52. Positioning block; 520. Through hole; 521. Positioning block inner ring; 53. Fixing bolt; 6. Heat shrink sleeve. DETAILED DESCRIPTION

[0045] The following is combined with Figures 1 to 11 The present invention is described in detail with specific implementation modes. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0046] like Figures 1 to 5As shown, this embodiment provides a sealing connection joint for anchoring of prestressed tendons, which is used to connect the anchor plate 1 and the prestressed pipe 5; the connection joint includes a sealing adapter 2, a connector 4, and an outer sealing ring 31 sleeved on the outer ring of the sealing adapter 2; the sealing adapter 2 includes a straight section 22 and a tapered section 21 that are fixedly connected; the tapered section 21 extends outward from one end of the straight section 22, and the outer diameter gradually increases to form a trumpet-shaped structure, the tapered section 21 is located inside the anchor plate 1 and the outer wall size of the tapered section 21 is adapted to the inner wall size of the small end 12 of the anchor plate 1; the straight section 22 is located outside the small end 12 of the anchor plate 1 and the outer ring is provided with an external thread structure; one end of the connector 4 is provided with an internal thread structure that matches the external thread structure, and the other end is sleeved on the outer ring of the prestressed pipe 5; the outer sealing ring 31 is interference fit between the end face of the small end 12 of the anchor plate 1 and the end face of the connector 4.

[0047] Specifically, in this embodiment, the prestressed pipe 5 is a corrugated pipe for passing prestressed tendons. The corrugated pipe has a corrugated structure, the portion with a larger outer diameter is a wave crest, and the portion with a smaller outer diameter is a wave trough. The sealed connection between the prestressed pipe 5 and the connector 4 can adopt the structure of the prior art or the heat shrink sleeve method in the following embodiment; the internal thread structure of the connector 4 is installed in conjunction with the external thread structure of the straight section 22 of the sealing adapter 2. During the installation process, the end face of the connector 4 moves toward the small end 12 of the anchor plate 1, and the end of the small end 12 of the anchor plate 1 The outer sealing ring 31 is clamped between the surface and the end face of the connecting head 4, and at the same time, the tapered section 21 of the sealing adapter 2 is driven to move toward the prestressed pipe 5. Since the inner diameter of the small end 12 of the anchor plate 1 is a gradually decreasing structure, that is, the outer diameter of the tapered section 21 is larger than the port inner diameter of the small end 12 of the anchor plate 1, therefore, when the installation is completed, the outer wall of the tapered section 21 is tightly attached to the inner wall of the small end 12 of the anchor plate 1, which can ensure the stability of the connection between the anchor plate 1 and the prestressed pipe 5 on the one hand, and improve the sealing performance between the connecting head 4 and the anchor plate 1 on the other hand.

[0048] Another embodiment, based on the above embodiment, further includes an inner sealing ring 32, the outer wall of the tapered section 21 is provided with an annular groove 20, and the inner sealing ring 32 is installed between the annular groove 20 and the inner wall of the anchor pad 1. After the connection structure is installed, the outer wall of the tapered section 21 of the sealing adapter 2 is tightly attached to the inner wall of the small end 12 of the anchor pad 1, that is, the lower wall of the groove 20 and the inner wall of the small end 12 clamp the inner sealing ring 32, which can further improve the stability of the anchoring system.

[0049] Another embodiment, based on the above embodiment, further includes a heat shrink sleeve 6, which is sleeved on the small end 12 of the anchor plate 1, the connecting head 4 and the outer ring of the prestressed pipe 5. The heat shrink sleeve 6 can further improve the stability and sealing of the anchoring system.

[0050] In another embodiment, based on the above embodiment, the inner wall of the conical section 21 is provided with an arc surface inclined along the divergent direction of the prestressed tendons, and the arc surface design can prevent the sealing adapter 2 from contacting the prestressed tendons.

[0051] Another embodiment, based on the above embodiment, a pipe sealing ring 33 is provided between the connector 4 and the trough of the corrugated pipe installed therein, and the pipe sealing ring 33 is interference fit with the outer wall of the corrugated pipe and the inner wall of the connector 4. The pipe sealing ring 33 can further improve the sealing performance between the connector 4 and the prestressed pipe 5.

[0052] In order to further facilitate the installation of the pipe sealing ring 33 and the prestressed pipe 5 , the inner wall of the connector 4 is provided with a step 40 for installing the pipe sealing ring 33 , and the step 40 can also be used for stopping and installing the prestressed pipe 5 .

[0053] In the above embodiment, the prestressed pipe 5 is exemplarily shown as a specific structure of a bellows. In other embodiments or practical applications, such as Figure 7 As shown, the prestressed pipe 5 can also be a structure with a spiral line on the outside, and the material can be one of metal or plastic. The inner wall of the end where the connector 4 is connected to the prestressed pipe 5 should be provided with a groove with a consistent spiral line shape to facilitate the screwing and installation of the prestressed pipe 5. In addition, in the specific structure of the bamboo bellows, the prestressed pipe 5 and the connector 4 can also be connected by the following structure, such as Figures 8 to 11As shown, the connection structure includes a clamping block 51 sleeved between two wave peaks of the end portion of the bamboo bellows to be connected, a positioning block 52 sleeved outside the clamping block 51, a fixing bolt 53 penetrating the positioning block 52 and threadedly connected to the connecting head 4, and a pipe sealing ring 33 matched with the end face of the bamboo bellows pipe mouth; specifically, the inner diameter of the clamping block 51 is adapted to the outer diameter of the wave trough of the bamboo bellows, the clamping block 51 can be formed by splicing two semicircular structures or a Havers clamping hoop structure or integrally formed with the bamboo bellows to achieve a matching connection with the outer ring of the bamboo bellows, and the structure in which the clamping block 51 is formed by splicing two semicircular structures is taken as an example for explanation, the outer wall of the clamping block 51 is provided with a supporting step 511 with a supporting surface facing away from the connecting head 4, and the outer wall of the clamping block 51 is also provided with a positioning section 512 along the support surface, and the positioning block 52 is sleeved on the outer ring of the positioning section 512 and the end The surface abuts against the supporting step 511, wherein the inner diameter of the positioning block 52 is adapted to the outer diameter of the positioning section 512. After the positioning block 52 is installed, the two semicircular structures are fixedly assembled on the outer ring of the bamboo bellows; the end face of the connector 4 connected to the prestressed pipe 5 is provided with a sink 421 for installing the pipe sealing ring 33, and the inner diameter of the sink 421 is smaller than the outer diameter of the pipe mouth of the bamboo bellows; wherein the positioning block 52 is provided with more than two evenly distributed through holes 520 along the circumferential direction, and the end face of the connector 4 is provided with a threaded hole 420 corresponding to the through hole 520, the threaded section of the fixing bolt 53 passes through the through hole 520, and is threadedly connected with the corresponding threaded hole 420, and its nut abuts against the end face of the positioning block 52; after the installation is completed, the two ends of the pipe sealing ring 33 are respectively interference fit with the sink 421 and the end face of the bellows mouth. In this embodiment, the connector 4 is connected to the prestressed pipe 5 by fixing bolts 53 and sealed by clamping the pipe sealing ring 33, which can further improve the stability and sealing of the connection structure between the connector 4 and the prestressed pipe 5.

[0054] Another embodiment provides a sealing construction method for anchoring prestressed tendons, wherein the specific sealing construction structure includes an anchor pad 1, a sealing adapter 2, an outer sealing ring 31, a connector 4, and a prestressed pipe 5, wherein the prestressed pipe 5 is a bamboo bellows, and the sealing adapter 2 includes a conical section 21 and a straight section 22 connected in sequence, wherein the outer wall taper of the conical section 21 is adapted to the inner wall taper of the small end 12 of the anchor pad 1, the outer diameter of the straight section 22 is smaller than the inner diameter of the small end 12 of the anchor pad 1, the outer diameter of the first end 41 of the connector, the end face outer diameter of the small end 12 of the anchor pad, and the outer diameter of the outer sealing ring 31 are adapted, and the inner diameter of the second end 42 of the connector is adapted to the outer diameter of the prestressed pipe 5; the sealing construction method comprises the following steps:

[0055] A) placing the anchor plate 1 and the spiral reinforcement on the formwork of the prestressed concrete structure to be poured;

[0056] B) Install the sealing adapter 2, such as Figure 2As shown, the sealing adapter 2 is installed from the large end 11 of the anchor plate 1 to the inside of the anchor plate 1, the tapered section 21 of the sealing adapter 2 fits with the inner wall of the small end 12 of the anchor plate 1, and the straight section 22 passes through the small end 12 of the anchor plate 1;

[0057] C) installing the outer sealing ring 31, and sleeve the outer sealing ring 31 on the outer ring of the straight tube section 22;

[0058] D) Install connector 4, such as Figure 4 As shown, the first end 41 of the connector is connected to the external thread of the straight section through the internal thread, until the end surface of the first end 41 of the connector and the end surface of the small end 12 of the anchor plate 1 clamp the outer sealing ring 31;

[0059] E) Install the prestressed pipe 5 and connect the prestressed pipe 5 to the second end 42 of the connector; the specific steps are:

[0060] E1) Install the pipeline sealing ring 33, such as Figure 6 As shown, the pipeline sealing ring 33 is sleeved on the outer ring of the end of the prestressed pipeline 5 to be connected;

[0061] E2) Insert the prestressed pipe 5 into the second end 42 of the connector, so that the inner wall of the second end 42 of the connector and the outer wall of the prestressed pipe 5 clamp the pipe sealing ring 33.

[0062] The construction method of this embodiment is to install the internal thread structure of the first end 41 of the connector in coordination with the external thread structure of the straight section 22 of the sealing adapter 2. When the connector 4 is rotated until its end face clamps the outer sealing ring 31 with the end face of the small end 12 of the anchor plate 1, the sealing adapter 2 moves relative to the anchor plate 1 toward the connector 4, so that the tapered section 21 of the sealing adapter 2 is in close contact with the inner wall of the small end 12 of the anchor plate 1, thereby improving the stability and sealing performance of the connection between the anchor plate 1 and the connector 4; the traditional heat shrink sleeve method is replaced by clamping the sealing ring with two components, thereby further improving the sealing performance and the stability of the sealing structure; and the sealing adapter 2 replaces the inner sleeve in the prior art, so that the sealing adapter 2 and the anchor plate 1, and the anchor plate 1 and the connector 4 are connected in a tight fit, thereby further improving the stability of the connection structure.

[0063] Another implementation mode, based on the above implementation mode, is as follows Figure 1 As shown, after the step of installing the prestressed pipe 5, the method further includes step F), installing a heat shrink sleeve 6, sleeved on the outer ring of the connection between the small end 12 of the anchor plate 1 and the connector 4, and the connection between the connector 4 and the prestressed pipe 5, and heated until the heat shrink sleeve 6 shrinks and wraps the connection. The heat shrink sleeve 6 can further improve the sealing performance and stability performance.

[0064] Another implementation mode, based on the above implementation mode, is as follows Figure 3 As shown, the outer wall of the tapered section 21 of the sealing adapter 2 is provided with an annular groove 20; before step B) installing the sealing adapter 2, it also includes step B0) installing the inner sealing ring 32, sleeve the inner sealing ring 32 in the groove 20 of the outer ring of the tapered section 21, when the outer wall of the tapered section 21 is in close contact with the inner wall of the small end 12 of the anchor plate 1, the groove 20 and the inner wall of the anchor plate 1 clamp the inner sealing ring 32, which can further improve the sealing performance.

[0065] The above embodiments exemplarily show the specific structure, connection and sealing methods of the prestressed pipe 5. In other embodiments or practical applications, other methods may be used instead, for example:

[0066] In terms of the specific structure of the prestressed pipe 5, Figure 7 As shown, the prestressed pipe 5 can also be a spiral corrugated pipe, and the connection structure of the second end 42 of the connector includes an inner spiral structure adapted to the spiral structure of the prestressed pipe 5. The construction method thereof is different from the above-mentioned embodiment in that step E) installs the prestressed pipe 5, and step E) specifically includes:

[0067] E1) Installing the pipe sealing ring 33, wherein the inner wall between the first end 41 of the connector and the second end 42 of the connector is provided with a step 40 with a support surface facing the prestressed pipe 5, and placing the pipe sealing ring 33 on the step 40;

[0068] E2) The prestressed pipe 5 is screwed into the second end 42 of the connector through the matching spiral structure, so that the pipe end surface of the prestressed pipe 5 and the step 40 clamp the pipe sealing ring 33, thereby completing the fixation and sealing of the connector 4 and the prestressed pipe 5.

[0069] In terms of the connection and sealing method between the prestressed pipe 5 and the second end 42 of the connector, as shown in FIG. Figures 8 to 11 As shown, the prestressed pipe 5 is specifically a bamboo bellows, and the sealing construction components of the prestressed pipe 5 and the second end 42 of the connector include a clamping block 51, a positioning block 52, and a fixing bolt 53, wherein the connection structure of the second end 42 of the connector includes a sink 421 located on the end surface, and four threaded holes 420 evenly distributed in the circumferential direction, and the clamping block 51 is two semicircular structures spliced ​​and sleeved between the two wave peaks at the end of the prestressed pipe 5, and the outer wall of the clamping block 51 is provided with a supporting step 511 with a supporting surface facing away from the connector 4, and the outer wall of the clamping block 51 is provided with a positioning section 512 facing upward on the supporting surface of the supporting step 511, and the outer diameter of the positioning section 512 is adapted to the size of the inner ring 521 of the positioning block, and the positioning block 52 is provided with four through holes 520 matching the threaded holes 420; on the basis of the above-mentioned embodiment, step E) specifically includes:

[0070] E1) Installing the pipeline sealing ring 33, installing the pipeline sealing ring 33 in the sink 421 of the second end 42 of the connector;

[0071] E20) installing the clamping block 51, and splicing the two semicircular structures outside the corresponding positions of the prestressed pipe 5;

[0072] E21) The positioning block 52 is sleeved on the outer ring of the positioning section 512 of the clamping block 51 along the axial direction of the prestressed pipe 5, so that the inner wall of the clamping block 51 is in close contact with the outer wall of the prestressed pipe 5, and the end face of the positioning block 52 is in contact with the supporting surface of the supporting step 511;

[0073] E3) Fix the prestressed pipe 5, align the pipe opening of the prestressed pipe 5 with the pipe sealing ring 33, pass four fixing bolts 53 through the through holes 520 of the positioning block 52 and threadedly connect them with the threaded holes 420 corresponding to the second end 42 of the connector, so that the pipe opening of the prestressed pipe 5 and the sink 421 clamp the pipe sealing ring 33.

[0074] In this embodiment, the positioning block 52 is connected to the second end 42 of the connector by a fixing bolt 53. The fixing bolt 53 is rotated to drive the clamping block 51 to move toward the second end 42 of the connector. The clamping block 51 pushes the wave crest of the prestressed pipe 5 so that the pipe mouth of the prestressed pipe 5 is pressed against the pipe sealing ring 33 installed on the end face of the second end 42 of the connector. The fixing bolt 53 and the threaded hole 420 are used to replace the traditional heat shrink sleeve method, thereby further improving the structural stability of the connector 4 and the prestressed pipe 5. The sealing method of the heat shrink sleeve is replaced by clamping the sealing ring 33 on the end faces of the two components, thereby further improving the sealing performance between the connector 4 and the prestressed pipe 5.

[0075] The above embodiments exemplarily show the specific structure and fixing method of the clamping block. In other embodiments or practical applications, the clamping block 51 can also be integrally formed with the prestressed pipe 5, or be sleeved on the outer ring of the prestressed pipe 5 through a Haversian structure, and the end surface of the clamping block 51 can be used as a supporting step; then step E) specifically includes:

[0076] E1) Installing the pipeline sealing ring 33, installing the pipeline sealing ring 33 in the sink 421 of the second end 42 of the connector;

[0077] E2) Install the positioning block 52, and sleeve the positioning block 52 on the outer ring of the prestressed pipe 5 with the clamping block 51, so that the end surface of the positioning block 52 abuts against the supporting surface of the supporting step 511 (that is, the end surface of the clamping block 51 facing away from the connector 4);

[0078] E3) Fix the prestressed pipe 5, align the pipe opening of the prestressed pipe 5 with the pipe sealing ring 33, pass the fixing bolt 53 through the through hole 520 of the positioning block 52 and threadedly connect it with the threaded hole 420 corresponding to the second end 42 of the connector, so that the pipe opening of the prestressed pipe 5 and the sink 421 clamp the pipe sealing ring 33.

[0079] In another embodiment, based on the above embodiment, the sealing construction method further comprises the following steps:

[0080] G) Pour concrete and remove the structural formwork after the concrete reaches the formwork removal conditions;

[0081] H) Install the prestressed tendons, insert the prestressed tendons into the prestressed pipe 5 along the large end 11 of the anchor plate, and tension the prestressed tendons; tension the prestressed tendons according to the requirements of the working anchor plate, working clips and tensioning tools, and after tensioning, cut off the prestressed tendons until the remaining 20 to 50 mm.

[0082] I) Anchor head sealing and anti-corrosion: The anchor cover is fixed to the large end 11 of the anchor pad by bolts, and anti-corrosion slurry is injected into the hole by grouting equipment. After the slurry solidifies, a plug is installed to seal the grouting hole.

[0083] The present invention provides a sealing connection joint and construction method for an anchor for prestressed tendons. The internal thread structure of the first end 41 of the connector is installed in coordination with the external thread structure of the sealing adapter 2. When the connector 4 is rotated until its end face and the end face of the small end 12 of the anchor plate clamp the outer sealing ring 31, the sealing adapter 2 moves relative to the anchor plate 1 toward the connector 4, so that the tapered section 21 of the sealing adapter 2 is in close contact with the inner wall of the small end 12 of the anchor plate, thereby improving the stability and sealing performance of the connection between the anchor plate 1 and the connector 4. The construction method of the present invention, on the one hand, replaces the traditional heat shrink sleeve method by clamping the sealing ring with two components, thereby further improving the sealing performance and the stability of the sealing structure. On the other hand, the sealing adapter 2 replaces the inner sleeve in the prior art, so that the sealing adapter 2 and the anchor plate 1, and the anchor plate 1 and the connector 4 are connected in a tight fit, thereby further improving the stability of the connection structure.

Claims

1. A sealed connection joint for prestressed tendons, characterized in that: Used to connect the anchor plate and the prestressed pipe; the connecting joint includes a sealing adapter, a connecting head, and an outer sealing ring sleeved on the outer ring of the sealing adapter; The sealing adapter comprises a straight section and a tapered section which are fixedly connected; the tapered section extends outward from one end of the straight section, the tapered section is located inside the anchor plate and the outer wall size of the tapered section matches the inner wall size of the small end of the anchor plate; the straight section is located outside the small end of the anchor plate and the outer ring is provided with an external thread structure; One end of the connector is provided with an internal thread structure matching the external thread structure, and the other end is connected to one end of the prestressed pipe; The outer sealing ring is also interference fit with the end face of the small opening of the anchor pad and the end face of the connecting head.

2. A prestressed tendon anchor sealed connection joint according to claim 1, characterized in that: It also includes an inner sealing ring. The outer wall of the tapered section is provided with a groove. The inner sealing ring is interference-fitted with the groove and the inner wall of the anchor pad.

3. The prestressed tendon anchor sealed connection joint according to claim 1, characterized in that: It also includes a heat shrink sleeve, which is arranged on the small end of the anchor plate, the connecting head and the outer ring of the prestressed pipe.

4. A sealed connection joint for prestressed tendon anchor according to claim 1, characterized in that: The inner wall of the tapered section is provided with an arc surface inclined along the divergent direction of the prestressed tendons.

5. The prestressed tendon anchor sealed connection joint according to claim 1, characterized in that: The pipe opening of the prestressed pipe is inserted into the interior of the connector, and a pipe sealing ring with interference fit is provided between the outer wall of the pipe opening and the inner wall of the connector.

6. The prestressed tendon anchor sealed connection joint according to claim 1, characterized in that: The prestressed pipe is a bamboo bellows, and the connection structure between the bamboo bellows and the connector includes a clamping block sleeved between two wave crests of the end of the bamboo bellows to be connected, a positioning block sleeved outside the clamping block, a fixing bolt penetrating the positioning block and threadedly connected to the connector, and a pipe sealing ring matched with the end face of the bamboo bellows pipe mouth; The outer wall of the clamp block is provided with a support step with the support surface facing away from the connector, and the outer wall of the clamp block is also provided with a positioning section along the support surface. The positioning block is sleeved on the outer ring of the positioning section and the end face thereof abuts against the support step; The end face of one end of the connector connected to the prestressed pipe is provided with a sink for installing a pipe sealing ring, the inner diameter of the sink is smaller than the outer diameter of the bamboo bellows pipe mouth; the pipe sealing ring is interference fit with the sink and the end face of the bamboo bellows pipe mouth.

7. A method for sealing a prestressed tendon anchor, characterized in that: The following steps are involved: A) Place anchor plates and spiral reinforcement on the formwork of the prestressed concrete structure to be poured; B) installing the sealing adapter from the large end of the anchor plate to the inside of the anchor plate, wherein the sealing adapter comprises a tapered section and a straight section with external threads, wherein the tapered section fits the inner wall of the small end of the anchor plate, and the straight section passes through the small end of the anchor plate; C) Install the outer sealing ring and put it on the outer ring of the straight tube section; D) Installing a connector, wherein the first end of the connector is provided with an internal thread structure matching with the external thread of the straight tube section, and the second end is provided with a connection structure matching with the prestressed pipe, and the first end of the connector is threadedly connected with the external thread of the straight tube section through the internal thread until the end face of the connector and the end face of the small end of the anchor plate clamp the outer sealing ring; E) Install the prestressed pipe and connect the prestressed pipe to the second end of the connector.

8. A method for sealing a prestressed tendon anchor according to claim 7, characterized in that: The outer wall of the tapered section of the sealing adapter is provided with a groove; before step B), the following steps are also included: Step B0) Install the inner sealing ring and sleeve the inner sealing ring into the groove of the outer ring of the tapered section.

9. A method for sealing a prestressed tendon anchor according to claim 7, characterized in that: The prestressed pipe is a bamboo bellows pipe; The connection structure at the second end of the connector includes a sink located on the end surface and two or more threaded holes evenly distributed in the circumferential direction; a clamping block is sleeved between the two wave peaks at the end of the prestressed pipe, and a positioning block is sleeved on the outer ring of the prestressed pipe, and the positioning block is provided with a through hole matching the threaded hole; wherein the clamping block is provided with a supporting step with a supporting surface facing away from the connector, and the end surface of the positioning block matches the supporting step; The step E) comprises: E1) Install the pipe sealing ring into the sink at the second end of the connector; E2) Install the positioning block, and sleeve the positioning block on the outer ring of the prestressed pipe with the clamping block, so that the end surface of the positioning block abuts against the supporting surface of the supporting step; E3) Fix the prestressed pipe, align the pipe mouth of the prestressed pipe with the pipe sealing ring, pass the fixing bolt through the through hole of the positioning block and thread it with the threaded hole corresponding to the second end of the connector, so that the pipe mouth of the prestressed pipe and the sinker clamp the pipe sealing ring.

10. A method for sealing a prestressed tendon anchor according to claim 9, characterized in that: The block includes two semicircular structures, the inner wall of which cooperates with the outer ring of the prestressed pipe after splicing, and the outer wall is provided with a positioning section facing the supporting surface of the supporting step, and the outer diameter of the positioning section is adapted to the inner diameter of the positioning block; the step E2) includes: E20) Install the clamping block to splice the two semicircular structures outside the corresponding position of the prestressed pipe; E21) The positioning block is sleeved on the outer ring of the positioning section of the clamping block along the axial direction of the prestressed pipe, so that the inner wall of the clamping block is in close contact with the outer wall of the prestressed pipe, and the end face of the positioning block is in contact with the supporting surface of the supporting step.

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