A sealing structure of a cable beam end anchorage zone and a preparation method thereof

Abstract

The application discloses a sealing structure of a cable beam end anchoring area and a preparation method, and the sealing structure comprises an anchor cup, a pre-buried pipe, a cable body, a sealing cylinder and a waterproof cover, one end of the pre-buried pipe is connected with the anchor cup, the other end of the pre-buried pipe is connected with the waterproof cover, the sealing cylinder is arranged in the pre-buried pipe, and the cable body is connected with the anchor cup after penetrating through the waterproof cover, the pre-buried pipe and the sealing cylinder. The filling type sealing structure composed of the sheath pipe and the sealing layer fully wraps the sealing structure between the anchor cup and the cable body. After the sealing layer is filled, the pipe opening of the sheath pipe is covered, and then the solidification is completed, so that the treatment of the inside of the pre-buried pipe is omitted, and long-time waiting for the sealing treatment of the pipe opening of the pre-buried pipe is not needed, and the problem of water inflow in the waiting process is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bridge cable, and particularly relates to a sealing structure of a cable beam end anchorage zone and a preparation method. BACKGROUND

[0002] In the embedded pipe at the beam end of the bridge cable, the sealing of the embedded pipe fails due to the dynamic load borne by the cable body, the thermal expansion and cold contraction of the PE material of the cable body, the condensate water accumulation due to the change of the environmental temperature difference, or the humidity of the environment. Water seepage occurs in the anchorage zone of the cable beam end, and corrosion and damage of the prestressed steel wire or the prestressed steel strand in the cable body occur. At present, the sealing structure between the cable body and the anchorage device adopts a threaded sealing glue, a rubber sealing ring, a sealing putty and a heat-shrinkable sleeve structure form, or the sealing of the embedded pipe joint at the beam end of the cable is improved, a combined sealing improvement of a waterproof cover or an increase of the sealing structure of an aluminum alloy air bag.

[0003] In actual engineering application, the waiting period from the completion of cable tensioning to the completion of filling sealing is long, and it is difficult to keep the embedded pipe at the beam end dry due to the influence of factors such as climate and improper protection. Generally, a drainage groove is opened on the nut at the beam end to guide the flow, but the internal humidity problem is difficult to completely solve. Further, sealing materials such as grout, wax and polysulfide rubber are filled into the embedded pipe, but there are two problems: on the one hand, the construction condition guarantee before filling the embedded pipe at the beam end is difficult; on the other hand, the difficulty and cost of treatment are increased for possible future maintenance, adjustment of cable force, and even replacement of the cable. Even if non-bonding wax or polysulfide rubber is used for sealing structure, the sealing condition of the cable body in the embedded pipe cannot be checked.

[0004] The patent document with the application number CN2015101857384 discloses a landscape bridge cable and a manufacturing method thereof, which comprises a cable body and two anchoring sealing assemblies located at both ends of the cable body. The cable body comprises n single PE prestressed tendons and a sleeve pipe located outside the n single PE prestressed tendons. Each anchoring sealing assembly comprises an anchoring clamping section and a sealing corrosion prevention section, and uses a corrosion prevention filler to enhance the corrosion prevention effect. However, the corrosion prevention material of the document is epoxy mortar or polyurea material or polyurethane material, and a sealing piece needs to be arranged at one end of the sealing cylinder for sealing. The sealing piece is inconvenient to disassemble, and causes inconvenience to the future maintenance and installation of the device.

[0005] The patent document with the application number CN2019104432685 discloses a cable-stayed construction method of a low-tower cable-stayed bridge, which comprises the following steps: outer sleeve hoisting: the anti-skid anchor tool end of the outer sleeve front end reaches the tower end cable saddle and is temporarily connected with the cable saddle entrance; cable-stayed steel strand cable passing: the steel strand cable is passed through the cable while being unwound, the steel strand cable is passed into the outer sleeve from the left side of the tower, passes through the tower end split-wire pipe cable saddle and enters the outer sleeve on the right side until the right side beam end, and the steel strand cables on both sides are pre-tensioned respectively; steel strand cable tensioning: single steel strand cable left and right synchronous tensioning and single-hole jack staged symmetrical tensioning technology are adopted; corrosion prevention treatment: the beam end anchor tool and the tower end anti-skid anchor tool are subjected to corrosion prevention treatment respectively. The corrosion prevention material filled is epoxy mortar, and foaming plugging technology is used, so that the corrosion prevention structure cannot be observed in later maintenance. SUMMARY

[0006] To solve the above technical problems, the present application provides a cable beam end anchorage zone sealing structure and a preparation method.

[0007] The present application is realized by the following technical solutions.

[0008] The present application provides a cable beam end anchorage zone sealing structure, which comprises an anchor cup, a pre-buried pipe, a cable body, a sealing cylinder and a waterproof cover, one end of the pre-buried pipe is connected with the anchor cup, the other end of the pre-buried pipe is connected with the waterproof cover, the sealing cylinder is arranged in the pre-buried pipe, and the cable body is connected with the anchor cup after penetrating through the waterproof cover, the pre-buried pipe and the sealing cylinder.

[0009] Preferably, a sheath pipe and a sealing layer are arranged in the pre-buried pipe, the cable body, the sealing cylinder and the sealing layer are arranged on the inner side of the sheath pipe, and the sealing layer is arranged on the outer side of the cable body and the sealing cylinder.

[0010] Preferably, the sealing layer comprises epoxy resin and diabase powder, and the mass ratio of the epoxy resin to the diabase powder is 1:1.2-1:1.6.

[0011] Preferably, a groove is arranged on one side of the anchor cup, a sealing gasket is arranged in the groove, the sheath pipe is arranged in the groove and connected with the anchor cup, and the material of the sealing gasket comprises rubber.

[0012] Preferably, a limiting ring A and a buckle ring are arranged at one end of the pre-buried pipe, the pre-buried pipe is connected through the limiting ring A and the buckle ring, and the buckle ring is arranged in the waterproof cover.

[0013] Preferably, a limiting ring B and a through hole are arranged on the buckle ring, the buckle ring is connected with the sheath pipe through the limiting ring B, and the cable body penetrates through the buckle ring through the through hole.

[0014] Preferably, the sheath pipe is arranged in a segmented manner.

[0015] Preferably, the buckle ring is arranged in a two-half manner.

[0016] A preparation method of a sealing structure of a cable beam end anchoring area, comprising the following steps:

[0017] S1: Before leaving the factory, a groove is processed on the end face of the anchor cup, the sealing gasket is fixed in the groove, and before assembling the anchor head, the sheath pipe is sleeved into the cable body according to the length of the embedded pipe, and is fixed at a position not affecting the production of the cable body and facilitating the coiling of the cable body,

[0018] S2: The cable body is laid out at the construction site, after the cable body is installed and tensioned, the sheath pipe is inserted into the groove on the end face of the anchor cup, the limiting ring B on one side of the buckle ring is buckled to one end of the sheath pipe, the limiting ring A of the embedded pipe is buckled on the other side of the buckle ring, the fixing of the sheath pipe is realized through the screw, then the material of the sealing layer is poured into the sheath pipe through the through hole on the buckle ring, until the sheath pipe is filled, and then the waterproof cover is installed after the sealing layer is cooled.

[0019] Preferably, in the step S1, the sheath pipe sleeved into the cable body is in a segmented state and is fixed on the cable body in a wrapping manner, and in the step S2, after the cable body is laid out at the construction site, the sheath pipes are welded into an integrated body at the horizontal position and are fixed on the cable body in a wrapping manner.

[0020] The beneficial effects of the present application are that:

[0021] 1. The filling type sealing structure composed of the sheath pipe and the sealing layer fully wraps the sealing structure between the anchor cup and the cable body. After the sealing layer is filled, the pipe opening of the sheath pipe is covered and can be cured, which saves the treatment of the inside of the embedded pipe and avoids the problem of water entering during the long waiting process.

[0022] 2. The sealing structure seals the structure in the embedded pipe, fully wraps and seals the entire sealing connection structure of the cable body, has better sealing effect, and does not affect the use of the cable under various working conditions.

[0023] 3. The sealing structure directly extends to the pipe opening of the embedded pipe, which is convenient for daily maintenance and opening inspection or arrangement of temperature and humidity monitoring devices.

[0024] 4. After the bridge construction is completed, only the buckle ring and the waterproof cover need to be removed, and the cable length can be adjusted up and down as needed within the permitted range, and the embedded pipe does not need to be sealed again. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a structural schematic diagram of the present application;

[0026] Fig. 2 is a structural schematic diagram of the groove of the present application;

[0027] Fig. 3 is a structural schematic diagram of the waterproof cover of the present application;

[0028] Fig. 4 This is a schematic diagram of the structure of the buckle of the present invention;

[0029] In the diagram: 1-Anchor cup, 2-Embedded pipe, 21-Limiting ring A, 3-Cable body, 4-Sheath tube, 5-Snap ring, 51-Limiting ring B, 52-Through hole, 53-Limiting ring C, 6-Sealing cylinder, 7-Waterproof cover, 8-Sealing layer, 9-Groove, 10-Sealing gasket, 11-Anchor. Detailed Implementation

[0030] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0031] Example 1:

[0032] like Figs. 1 to 4 As shown, a sealing structure for the anchorage area of ​​a cable beam includes an anchor cup 1, a pre-embedded pipe 2, a cable body 3, a sealing cylinder 6, and a waterproof cover 7. One end of the pre-embedded pipe 2 is connected to the anchor cup 1, and the other end of the pre-embedded pipe 2 is connected to the waterproof cover 7. The sealing cylinder 6 is disposed inside the pre-embedded pipe 2. The cable body 3 passes through the waterproof cover 7, the pre-embedded pipe 2, and the sealing cylinder 6 and is then connected to the anchor cup 1. The anchor cup 1 is connected to the anchor 11.

[0033] The pre-embedded pipe 2 is provided with a sheath pipe 4 and a sealing layer 8. The cable body 3, the sealing cylinder 6 and the sealing layer 8 are located inside the sheath pipe 4, and the sealing layer 8 is located outside the cable body 3 and the sealing cylinder 6.

[0034] The sealing layer 8 is composed of epoxy resin and diabase powder mixed and stirred, with the mass ratio of epoxy resin to diabase powder being 1:1.2. The sealing layer 8 may also include other epoxy-based sealing materials that do not produce bubbles during the mixing process and have a certain degree of adhesion to metal and HDPE cable. The setting of the sealing layer 8 further improves the waterproof and anti-corrosion effect of the anchoring area.

[0035] A groove 9 is provided on one side of the anchor cup 1, and a sealing gasket 10 is provided in the groove 9. The sheath tube 4 is placed in the groove 9 and connected to the anchor cup 1. The sealing gasket 10 is made of rubber.

[0036] One end of the pre-embedded pipe 2 is provided with a limiting ring A21 and a buckle 5. The pre-embedded pipe 2 is connected to the limiting ring C53 through the limiting ring A21 and the buckle 5 and is fixed by screws. The buckle 5 is set inside the waterproof cover 7.

[0037] The buckle 5 is provided with a limiting ring B51 and a through hole 52. The buckle 5 is connected to the sheath tube 4 through the limiting ring B51 and is hook-shaped for restriction. The rope body 3 passes through the buckle 5 through the through hole 52.

[0038] The sheath pipe 4 is provided in a segmented manner, which facilitates the sheath pipe 4 to be worn on the cable body 3 and facilitates the cable body 3 to be coiled without being damaged.

[0039] The clamping ring 5 is provided in a two-half manner, which facilitates the clamping ring 5 to be adaptively clamped according to the final position after the installation of the cable body 3 is completed.

[0040] A preparation method of a sealing structure of a cable beam end anchoring area, comprising the following steps:

[0041] S1: Before leaving the factory, a groove 9 is processed on the end face of the anchor cup 1, and a sealing gasket 10 is fixed in the groove 9. Before the anchor head is assembled in the factory, a sheath pipe 4 in a segmented state with a length of 15 cm per segment is sleeved into the cable body 3 according to the length of the embedded pipe 2, and is fixed in a position that does not affect the production of the cable body 3 and facilitates the coiling of the cable body 3 by wrapping,

[0042] S2: After the cable body 3 is laid out at the construction site, the sheath pipe 4 is welded into one body in segments by using a two-half plastic butt welding device at the horizontal position, and is wrapped and fixed on the cable body 3. After the installation and tensioning of the cable body 3 are completed, the sheath pipe 4 is inserted into the groove 9 on the end face of the anchor cup 1, the limiting ring B51 on one side of the clamping ring 5 is clamped into one end of the sheath pipe 4, the limiting ring A21 of the embedded pipe 2 is sleeved on the other side of the clamping ring 5, and the sheath pipe 4 is fixed by downward clamping through screwing. Then, the material of the sealing layer 8 is poured into the sheath pipe 4 through the through hole 52 on the clamping ring 5 after the first tensioning is completed, until the sheath pipe 4 is filled, and then the waterproof cover 7 is installed after the sealing layer 8 is cooled.

[0043] Example 2

[0044] The sealing structure and the preparation method are basically the same as those of Example 1, except that the mass ratio of the epoxy resin to the diabase powder is 1:1.4, and the length of each segment of the sheath pipe 4 is 30 cm.

[0045] Example 3

[0046] The sealing structure and the preparation method are basically the same as those of Example 1, except that the mass ratio of the epoxy resin to the diabase powder is 1:1.6, and the length of each segment of the sheath pipe 4 is 40 cm.

[0047] The sealing structures prepared in Examples 1-3 are subjected to a simulated continuous water soaking test for 10,000 hours, and the obtained data are shown in the following table.

[0048]

[0049] As shown in the above table, after the continuous water soaking test for 10,000 hours, the humidity in the cable anchorage device of Examples 1-3 is less than 60%, which meets the use requirements.

[0050] By adding a filling sealing structure (sleeve pipe 4 and sealing layer 8) between the anchor cup 1 and the embedded pipe 2, the structure between the anchor cup 1 and the cable 3 is fully wrapped and extended to the pipe opening on the side of the waterproof cover 7 of the embedded pipe 2, so as to realize the reinforced sealing treatment of the cable beam end anchoring area, the sealing performance is more superior, and it is also beneficial to the opening inspection or arrangement of temperature and humidity monitoring device for daily maintenance and pipe maintenance.

Claims

1. A sealing structure for a cable beam end anchorage, characterized by: It includes an anchor cup (1), a pre-embedded pipe (2), a cable body (3), a sealing cylinder (6), and a waterproof cover (7). One end of the pre-embedded pipe (2) is connected to the anchor cup (1), and the other end of the pre-embedded pipe (2) is connected to the waterproof cover (7). The sealing cylinder (6) is set inside the pre-embedded pipe (2). The cable body (3) passes through the waterproof cover (7), the pre-embedded pipe (2), and the sealing cylinder (6) and is then connected to the anchor cup (1). The pre-embedded pipe (2) is provided with a sheath (4) and a sealing layer (8). The cable body (3), the sealing cylinder (6) and the sealing layer (8) are located inside the sheath (4), and the sealing layer (8) is located outside the cable body (3) and the sealing cylinder (6). A groove (9) is provided on one side of the anchor cup (1), and a sealing gasket (10) is provided in the groove (9). The sheath tube (4) is placed in the groove (9) and connected to the anchor cup (1). The sealing gasket (10) is made of rubber. One end of the pre-embedded pipe (2) is provided with a limiting ring A (21) and a buckle (5). The pre-embedded pipe (2) is connected through the limiting ring A (21) and the buckle (5). The buckle (5) is set inside the waterproof cover (7). The buckle (5) is provided with a limiting ring B (51) and a through hole (52). The buckle (5) is connected to the sheath tube (4) through the limiting ring B (51), and the cable body (3) passes through the buckle (5) through the through hole (52).

2. A sealing structure for a cable beam end anchorage zone as claimed in claim 1, characterised in that: The sealing layer (8) comprises epoxy resin and diabase powder, wherein the mass ratio of epoxy resin to diabase powder is 1:1.2-1:1.

6.

3. A sealing structure for a cable beam end anchorage zone as claimed in claim 1, wherein: The sheath tube (4) is segmented.

4. A sealing structure for a cable beam end anchorage zone as claimed in claim 1, wherein: The buckle (5) is a two-part design.

5. A method of producing a sealing structure for a cable beam end anchorage zone according to any one of claims 1 to 4, characterized in that Includes the following steps: S1: Before leaving the factory, a groove (9) is machined on the end face of the anchor cup (1), and the sealing gasket (10) is fixed in the groove (9). Before assembling the anchor head, the sheath tube (4) is set according to the length of the pre-embedded pipe (2) and inserted into the cable body (3), and fixed in a position that does not affect the production of the cable body (3) and facilitates the coiling of the cable body (3). S2: Release the cable body (3) at the construction site. After the cable body (3) is installed and tensioned, insert the sheath tube (4) into the groove (9) on the end face of the anchor cup (1). Use the limiting ring B (51) on one side of the buckle (5) to fasten and fit one end of the sheath tube (4). The other side of the buckle (5) fits the limiting ring A (21) of the pre-embedded pipe (2). Fix the sheath tube (4) with screws. Then, through the through hole (52) on the buckle (5), inject the material of the sealing layer (8) into the sheath tube (4) until the sheath tube (4) is filled. After the sealing layer (8) cools down, install the waterproof cover (7).

6. The method for preparing a sealing structure for the anchorage zone at the end of a cable-stayed beam as described in claim 5, characterized in that: In step S1, the sheath tube (4) inserted into the cable body (3) is in a segmented state and is fixed to the cable body (3) by wrapping. In step S2, after the cable body (3) is released at the construction site, the sheath tube (4) is welded into a whole segment by segment at the horizontal position and wrapped and fixed to the cable body (3).

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