Immersed tunnel pipe section connector inhaul cable connecting structure

Abstract

An immersed tunnel pipe section connector inhaul cable connecting structure comprises a finished cable body (1) and a tubular embedded part (3) and is characterized in that the fixed end of the finished cable body (1) penetrates into an installation hole in a fixed end spherical base plate (4), a spherical nut (5) is installed at the fixed end of the finished cable body (1), a protective cover (7) is arranged outside the fixed end of the finished cable body (1), and the tubular embedded part (3) is installed on the protective cover (7). Locking nuts (11) are installed on the anchor heads of the tensioning ends of the finished cable bodies (1) and the anchor heads of the end portions of the adjacent finished cable bodies (1) respectively, the tensioning ends of the finished cable bodies (1) are connected with the adjacent finished cable bodies (1) through inhaul cable connecting pieces, the structure is reasonable, the requirement for alignment precision is lowered, installation positioning errors can be conveniently made up, and the installation accuracy is improved. In addition, secondary stress caused by eccentricity of the two inhaul cables when the two inhaul cables are not on the same straight line is effectively avoided, installation and operation are convenient, and the waterproof and anti-corrosion performance is improved.

Description

TECHNICAL FIELD

[0001] The application relates to a cable connecting structure, in particular to a pipe section joint cable connecting structure of a immersed tunnel, and belongs to the technical field of engineering prestress. BACKGROUND

[0002] At present, the joint connecting forms of the immersed tunnel include rigid and flexible types, and the flexible joint is mainly used in actual immersed tunnel engineering, and the flexible joint usually allows the pipe section joint to rotate and displace in a proper amount, and can guarantee the water tightness of the joint part while bearing certain tension, shear and bending moment. Through analysis and calculation of a large number of engineering, if the flexible joint scheme is adopted, the shear value at the joint between the bank structure and the immersed pipe section is only 44% of that of the rigid joint scheme, and the maximum bending moment and maximum shear in the pipe section are reduced by 35% and 35% respectively. In the prior art, the pipe section joint adopts a steel cable tensioning connecting structure, which mainly comprises a steel cable embedded part, a steel cable or a smooth steel strand and a sheath thereof, and further comprises a fixed end anchor ring at both ends of the cable body, the cable body is provided with an extrusion head or an extrusion sleeve at both ends, and the embedded part is internally injected with butter for corrosion protection. Since the length of the embedded part is too long, the oil injection often cannot be full or the oil cannot be injected into the inside, resulting in corrosion failure. In addition, the water vapor in the immersed tunnel pipe section joint part is relatively heavy, the environment is humid, and the marine salt corrosion is serious, so that the traditional structure does not have reliable waterproof measures and corrosion effect, and the service life of the cable is shortened. If the tension fails, the connection between the immersed tunnels will be loose, and the consequences under the action of water pressure are unpredictable.

[0003] In addition, the positioning error precision requirement of the embedded part installed at the joint end of the adjacent two immersed tunnel pipe sections is high, the installation operation is difficult, the cost is high, and the construction is complex. One of the shortcomings of the existing fixed end anchor ring structure is that additional constraints exist, that is, while providing the required axial tensile resistance, additional shear and bending resistance will be generated, and the secondary internal force generated by the additional constraints will cause the local stress of the structure to be too high and will damage the concrete of the prefabricated pipe section. A structure that is reasonable in structure, convenient to install and construct, has little shrinkage during tensioning, can automatically adjust within a certain angle range, has reliable waterproof and corrosion resistance, and effectively solves the technical problem has been lacked for a long time. SUMMARY

[0004] The purpose of the present application is to solve the problems of high accuracy requirement for traditional immersed tube tunnel pipe joint cable connection site, great installation operation difficulty, complex construction, secondary stress caused by additional constraint which easily causes local stress of structure to be too high to damage the concrete of prefabricated pipe section, poor waterproof and corrosion resistance, and the present application provides an immersed tube tunnel pipe joint cable connection structure which has reasonable structure, reduces the accuracy requirement, can conveniently compensate for installation positioning error, effectively avoids secondary stress caused by eccentricity of two cables not on the same straight line, is convenient to install, and improves the waterproof and corrosion resistance.

[0005] To achieve the above purpose, the technical solution of the present application is as follows: an immersed tube tunnel pipe joint cable connection structure, comprising a finished cable body and a tubular embedded part, the embedded part is arranged in the concrete of the immersed tube pipe section, the finished cable body is arranged in the embedded part, the fixed end of the finished cable body is arranged in the mounting hole of the fixed end spherical pad, a spherical nut is arranged on the fixed end of the finished cable body, the spherical contact surface of the spherical nut is matched with the spherical surface of the fixed end spherical pad, a protective cover is arranged outside the fixed end of the finished cable body, corrosion-proof grease is filled between the protective cover and the anchor head of the end of the finished cable body, a locking nut is arranged on the anchor head of the tension end of the finished cable body and the end anchor head of the adjacent finished cable body respectively, and the tension end of the finished cable body and the adjacent finished cable body are connected through a cable connecting piece.

[0006] Further, the cable connecting piece is a whole connecting sleeve, the anchor head of the finished cable body at the tension end is connected with one end of the connecting sleeve through a threaded connection mode, and the anchor head of one end of the adjacent finished cable body is connected with the other end of the connecting sleeve through a threaded connection mode.

[0007] Further, the cable connecting piece is a combined connecting sleeve, the anchor head of the finished cable body at the tension end is connected with one end of the connecting sleeve, and the anchor head of one end of the adjacent finished cable body is connected with the other end of the connecting sleeve.

[0008] Further, the connecting sleeve comprises an upper sleeve, a lower sleeve and a connecting bolt, the upper sleeve and the lower sleeve are half circular ring sleeve structures, the upper sleeve and the lower sleeve are combined in abutment to form a ring sleeve structure, and the upper sleeve and the lower sleeve are locked and fixed through the connecting bolt.

[0009] Further, sealing glue is arranged on the splicing joint of the upper sleeve and the lower sleeve, and the connecting bolt is a high-strength bolt.

[0010] Further, a tension nut is arranged on the anchor head of each of the two adjacent finished cable bodies in the connecting sleeve, and a tension end spherical pad is arranged between the tension nut and the stepped surface on the inner wall of the connecting sleeve.

[0011] Further, the locking nuts of the anchor head of the tensioning end of the finished cable body and the locking nuts of the adjacent end anchor head of the finished cable body are provided with a tensioning device.

[0012] Further, the tensioning device is pressed on the locking nut through the top plate, and the tensioning device adopts a tensioning jack.

[0013] Further, a sealing cover is arranged between the outer end of the embedded part and the outer surface of the finished cable body, and a protective cylinder is arranged on the periphery of the protective cover.

[0014] Further, a force monitoring device is arranged in the anchor head of the finished cable body, and the force monitoring device is connected with a data collector through a data line.

[0015] The beneficial effects of the present application are:

[0016] 1. The spherical washer and spherical nut with spherical contact surface are adopted in the present application, which not only increases the force contact area, but also enables the cable body to automatically adjust in any direction within a certain angle range, effectively avoids the secondary stress caused by the eccentricity of the force of the two cables, and facilitates the compensation of installation positioning errors.

[0017] 2. The present application adopts a fully sealed structure in waterproof and corrosion prevention technology, and is provided with multiple protections, which can completely and permanently isolate the steel strand from the outside air and water vapor, and the permanent protection performance is quite reliable.

[0018] 3. The present application has reasonable structure, convenient installation and operation, reduces the construction difficulty, is beneficial to the optimization and beauty of the overall structure, can reduce the size of the embedded part pipeline, provides convenience for the installation and replacement of the cable connecting piece, can reduce the total weight of the cable body under the same design stress, and has obvious economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of the present application installed in the immersed tube section.

[0020] Figure 2 is a structural schematic view of the first embodiment of the present application.

[0021] Figure 3 is a partial enlarged view of Figure 2 .

[0022] Figure 4 is a structural schematic view of the second embodiment of the present application.

[0023] Figure 5 is a partial enlarged view of Figure 4 .

[0024] Figure 6is a partial sectional view of the preformed part of the present application.

[0025] Figure 7 is a structural schematic diagram of the finished cable body of the present application.

[0026] Figure 8 is a sectional structural schematic diagram of the finished cable body of the present application.

[0027] Figure 9 is a structural schematic diagram of the spherical nut of the present application.

[0028] Figure 10 is a structural schematic diagram of the fixed-end spherical gasket plate of the present application.

[0029] Figure 11 is a structural schematic diagram of the connecting sleeve of the present application.

[0030] Figure 12 is Figure 11 is a sectional view of B-B.

[0031] Figure 13 is a structural schematic diagram of the connecting cylinder of the present application.

[0032] Figure 14 is Figure 13 is a sectional view of A-A.

[0033] Figure 15 is Figure 13 is a sectional view of C-C.

[0034] Figure 16 is a tensioning installation schematic diagram of the first embodiment of the present application.

[0035] Figure 17 is a tensioning installation schematic diagram of the second embodiment of the present application.

[0036] Figure 18 is a structural schematic diagram of the tensioning device of the present application.

[0037] Figure 19 is Figure 18 is a side structural schematic diagram of

[0038] Figure 20 is an installation state diagram of the first embodiment of the present application.

[0039] Figure 21 is an installation state diagram of the second embodiment of the present application.

[0040] Figure: finished cable body 1, immersed tube segment concrete 2, embedded part 3, fixed end spherical pad 4, spherical nut 5, protective cylinder 6, protective cover 7, sealing cover 8, anti-corrosion grease 9, connecting sleeve 10, locking nut 11, connecting joint cylinder 12, upper joint cylinder 13, lower joint cylinder 14, connecting bolt 15, sealing glue 16, tensioning end spherical pad 17, tensioning nut 18, tensioning device 19, top plate 20, force monitoring device 21, data collector 22. DETAILED DESCRIPTION

[0041] The application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Reference Figures 1 to 21 , a immersed tube tunnel segment joint cable connecting structure of the application, comprising a finished cable body 1 and a tubular embedded part 3, the embedded part 3 is arranged in the immersed tube segment concrete 2, the finished cable body 1 is arranged in the embedded part 3, characterized in that: the fixed end of the finished cable body 1 is arranged in the mounting hole of the fixed end spherical pad 4, and the fixed end of the finished cable body 1 is provided with a spherical nut 5, the spherical contact surface of the spherical nut 5 is matched with the spherical surface of the fixed end spherical pad 4, the protective cover 7 is arranged outside the fixed end of the finished cable body 1, the anchor head of the tensioning end of the finished cable body 1 and the anchor head of the adjacent finished cable body 1 are respectively provided with a locking nut 11, and the tensioning end of the finished cable body 1 is connected with the adjacent finished cable body 1 through a cable connecting piece.

[0043] The cable connecting piece is a whole connecting sleeve 10, the anchor head of the finished cable body 1 at the tensioning end is connected with one end of the connecting sleeve 10 through a threaded connection mode, and the anchor head of one end of the adjacent finished cable body 1 is connected with the other end of the connecting sleeve 10 through a threaded connection mode.

[0044] The cable connecting piece is a combined connecting joint cylinder 12, the anchor head of the finished cable body 1 at the tensioning end is connected with one end of the connecting sleeve 10, and the anchor head of one end of the adjacent finished cable body 1 is connected with the other end of the connecting sleeve 10.

[0045] The connecting joint cylinder 12 comprises an upper joint cylinder 13, a lower joint cylinder 14 and a connecting bolt 15, the upper joint cylinder 13 and the lower joint cylinder 14 are half circular ring cylinder structures, the upper joint cylinder 13 and the lower joint cylinder 14 are combined in a ring cylinder structure after butt joint, and the upper joint cylinder 13 and the lower joint cylinder 14 are locked and fixed through the connecting bolt 15.

[0046] The sealing glue 16 is arranged on the splicing seam of the upper joint cylinder 13 and the lower joint cylinder 14, and the connecting bolt 15 is a high-strength bolt.

[0047] The anchor head of the adjacent two finished cable bodies 1 inside the connecting cylinder 12 is respectively provided with a tensioning nut 18, and the tensioning nut 18 is provided with a tensioning end spherical pad 17 between the stepped surface on the inner wall of the connecting cylinder 12.

[0048] The anchor head of the tensioning end of the finished cable body 1 is provided with a locking nut 11, and the locking nut 11 is provided between the anchor head of the end of the adjacent finished cable body 1.

[0049] The tensioning device 19 is pressed on the locking nut 11 through the top plate 20, and the tensioning device 19 adopts a tensioning jack.

[0050] The outer end of the embedded part 3 is provided with a sealing cover 8 between the outer surface of the finished cable body 1, and the periphery of the protective cover 7 is provided with a protective cylinder 6.

[0051] The anchor head of the finished cable body 1 is provided with a force monitoring device 21, and the force monitoring device 21 is connected with a data collector 22 through a data line.

[0052] Referring to the drawings, the cable body anchor head of the application adopts a fully enclosed structure, which achieves good corrosion and protection performance. At the same time, the cable body end adopts a spherical pad with a spherical contact surface and a spherical nut, which not only increases the stress contact area, but also can automatically adjust within a 2-degree range in any direction under the action of the spherical pad and the spherical nut, effectively solving the problem of uneven stress of the pad and the nut when the cable body is inclined. The specific structure and principle are as follows:

[0053] The finished cable body 1 of the application has various types, mainly including steel strand extrusion cable, cold cast anchor steel wire cable, hot cast anchor cable, steel wire cable, steel wire rope and other types of cable. The two ends of the finished cable body 1 of the application are extruded and anchored, the stress of each steel strand is isolated, the steel strand is difficult to fall off, the static load is safe and reliable, and the fatigue performance is good. The two ends of the steel strand are bundled and extruded in the anchor sleeve, and the retraction amount is very small during tensioning. Under low stress or even negative stress, the steel strand will not slip. The angle of the steel strand entering the anchor head is small and almost not subjected to bending stress. The steel strand bundled and isolated extrusion anchor is mainly anchored by friction, so its fatigue resistance is very good.

[0054] The main structure of the immersed tunnel is made of immersed tube concrete 2, and a pre-embedded part 3 is embedded in the immersed tube concrete 2, the pre-embedded part 3 is a tubular structure, and is used for penetrating and fixing the finished cable body 1. The fixed end of the finished cable body 1 is located in the pre-embedded part 3 and penetrates the mounting hole on the fixed end spherical pad 4, and the fixed end of the finished cable body 1 is provided with a spherical nut 5, the spherical contact surface of the spherical nut 5 is in contact with the spherical surface on the fixed end spherical pad 4, and when the finished cable body 1 is pulled, the pulling force is transmitted to the fixed end spherical pad 4 through the spherical nut 5. The spherical surface cooperation between the fixed end spherical pad 4 and the spherical nut 5 realizes automatic adaptive swing adjustment in any direction within a certain angle range, and avoids the problem that the gasket and the nut are unevenly stressed when the cable body is inclined.

[0055] The connection between the outer tension end of the finished cable body 1 and the adjacent finished cable body 1 is also important, the tension end of the finished cable body 1 and the adjacent finished cable body 1 are connected through a cable connecting piece, the cable connecting piece has various structural forms, mainly including a whole connecting sleeve 10 and a combined connecting sleeve 12, and the specific structure is as follows:

[0056] Embodiment one: the cable connecting piece adopts the whole connecting sleeve 10, the anchor head of the tension end of the finished cable body 1 and the anchor head at the end of the adjacent finished cable body 1 are respectively provided with locking nuts 11, the anchor head of the finished cable body 1 at the tension end is connected with one end of the connecting sleeve 10 in a threaded connection mode, and the anchor head at one end of the adjacent finished cable body 1 is connected with the other end of the connecting sleeve 10 in a threaded connection mode. The connection can also be achieved in the nut locking mode.

[0057] Embodiment two: the cable connecting piece adopts the combined connecting sleeve 12, the combined connecting sleeve 12 includes an upper sleeve 13, a lower sleeve 14 and connecting bolts 15, the upper sleeve 13 and the lower sleeve 14 are half circular ring sleeve structures, and the upper sleeve 13 and the lower sleeve 14 are combined in a ring sleeve structure after butt joint. The combined connecting sleeve 12 is a metal cylinder with two open ends, the hole diameter of the middle part of the inner cavity is larger than the hole diameter of the two ends, so that the tension end spherical pad 17 and the tension nut 18 are conveniently installed. The upper sleeve 13 and the lower sleeve 14 are locked and fixed through the plurality of connecting bolts 15, the connecting bolts 15 are high-strength bolts, and the upper sleeve 13 and the lower sleeve 14 form an integral structure after being fixed. In order to improve the sealing performance between the upper sleeve 13 and the lower sleeve 14, sealing glue 16 is arranged on the splicing joint of the upper sleeve 13 and the lower sleeve 14.

[0058] The anchor head of the two adjacent finished cable bodies 1 inside the connecting sleeve 12 is respectively provided with a tensioning nut 18, and a tensioning end spherical pad 17 is arranged between the tensioning nut 18 and the stepped surface on the inner wall of the connecting sleeve 12, the tensioning end spherical pad 17 is in contact with the tensioning nut 18, and the tensioning end spherical pad 17 is located between the stepped surface of the connecting sleeve 10 and the tensioning nut 18. The contact surface of the tensioning nut 18 and the tensioning end spherical pad 17 is spherical, the stress surface of the tensioning end spherical pad 17 is a spherical curved surface corresponding to the spherical contact surface of the tensioning nut 18, and the spherical surface cooperation between the tensioning end spherical pad 17 and the tensioning nut 18 enables the cable body to automatically and adaptively swing and adjust in any direction within a certain angle range, which is beneficial to compensate for installation and positioning errors.

[0059] The spherical nut used in the application can not only increase the stress contact area, but also has the technical effect of preventing loosening and plays a retreat-preventing role. When there is stress in the axial direction of the cable during fastening, the friction between the threads can be increased. Such configuration makes the fastened object less likely to loosen.

[0060] In terms of waterproof and corrosion prevention, the application is provided with a protective cover 7 outside the fixed end of the finished cable body 1, the protective cover 7 and the anchor head at the end of the finished cable body 1 are filled with corrosion-resistant grease 9, and a protective cylinder 6 is installed on the periphery of the protective cover 7 for multiple protection. Meanwhile, a sealing cover 8 is arranged between the outer end of the embedded part 3 and the outer surface of the finished cable body 1 to achieve full sealing. After multiple protection, the steel strand can be completely and permanently isolated from the outside air and moisture, and the permanent protection performance is quite reliable.

[0061] Before tensioning, the tensioning device 19 needs to be installed at the tensioning end of the two adjacent cable bodies, specifically, the tensioning device 19 is installed between the locking nut 11 installed on the anchor head at the tensioning end of the finished cable body 1 and the locking nut 11 installed on the end anchor head of the adjacent finished cable body 1, the tensioning device 19 is pressed on the locking nut 11 through the top plate 20, and the tensioning device 19 generally adopts a tensioning jack.

[0062] In addition, the application also increases the cable stress monitoring device, and the force monitoring device 21 is arranged in the anchor head of the finished cable body 1, the force monitoring device 21 is connected with the data collector 22 through a data line, the joint cable stress can be better monitored, the monitoring data is transmitted to the outside through the data collector 22, the safety early warning judgment of the cable stress and the tunnel pipe joint is realized, and the accuracy of the monitoring result is ensured.

[0063] The above description is further detailed description of the present application in connection with the specific implementation, and cannot be considered as the specific implementation of the present application only limited to these descriptions. For ordinary skilled in the art to which the present application belongs, under the premise of not departing from the concept of the present application, the present application will have various simple replacements, improvements and changes, and various simple replacements, improvements and changes made should be considered as belonging to the protection scope of the present application.

Claims

1. A cable connection structure for a joint of a immersed tube tunnel pipe section, comprising a finished cable body (1) and a tubular embedded part (3), the embedded part (3) is arranged in the immersed tube pipe section concrete (2), the finished cable body (1) is arranged in the embedded part (3), characterized in that: The fixed end of the finished cable body (1) penetrates into the mounting hole on the fixed end spherical pad plate (4), and the fixed end of the finished cable body (1) is provided with a spherical nut (5), the spherical contact surface of the spherical nut (5) is matched with the spherical surface on the fixed end spherical pad plate (4), the fixed end of the finished cable body (1) is externally provided with a protective cover (7), the protective cover (7) and the anchor head of the end of the finished cable body (1) are filled with corrosion-proof grease (9), the anchor head of the tension end of the finished cable body (1) and the end anchor head of the adjacent finished cable body (1) are respectively provided with locking nuts (11), and the tension end of the finished cable body (1) and the adjacent finished cable body (1) are connected through a cable connecting piece.

2. A tieback connection for a joint between immersed tunnel tube elements according to claim 1, characterized in that: The cable connecting piece is a whole connecting sleeve (10), the anchor head of the finished cable body (1) at the tension end is connected with one end of the connecting sleeve (10) through a threaded connection mode, and the anchor head of one end of the adjacent finished cable body (1) is connected with the other end of the connecting sleeve (10) through a threaded connection mode.

3. The immersed tunnel segment joint in-situ cable connection structure according to claim 1, characterized in that: The cable connecting piece is a combined connecting cylinder (12), the anchor head of the finished cable body (1) at the tension end is connected with one end of the connecting sleeve (10), and the anchor head of one end of the adjacent finished cable body (1) is connected with the other end of the connecting sleeve (10).

4. A tieback connection for a joint between immersed tunnel tube elements according to claim 3, characterized in that: The connecting cylinder (12) comprises an upper cylinder (13), a lower cylinder (14) and a connecting bolt (15), the upper cylinder (13) and the lower cylinder (14) are half circular ring cylinder structures, the upper cylinder (13) and the lower cylinder (14) are combined to form a ring cylinder structure, and the upper cylinder (13) and the lower cylinder (14) are locked and fixed through the connecting bolt (15).

5. A tieback connection for a joint between immersed tunnel tube elements according to claim 4, characterized in that: The splicing joint of the upper cylinder (13) and the lower cylinder (14) is provided with sealing glue (16), and the connecting bolt (15) is a high-strength bolt.

6. A tieback connection for a joint between immersed tunnel tube elements according to claim 3, characterized in that: The anchor heads of the two adjacent finished cable bodies (1) in the connecting cylinder (12) are respectively provided with tension nuts (18), and the tension nuts (18) and the stepped surface on the inner wall of the connecting cylinder (12) are provided with tension end spherical pad plates (17).

7. The immersed tunnel segment joint in-situ cable connection structure according to claim 1, characterized in that: The locking nuts (11) installed on the anchor head of the tension end of the finished cable body (1) and the locking nuts (11) installed on the end anchor head of the adjacent finished cable body (1) are provided with a tension device (19).

8. A tieback connection for a joint between immersed tunnel tube elements according to claim 7, characterized in that: The tension device (19) is pressed on the locking nut (11) through a top plate (20), and the tension device (19) is a tension jack.

9. The immersed tunnel segment joint in-situ cable connection structure according to claim 1, characterized in that: The outer end of the embedded part (3) and the outer surface of the finished cable body (1) are provided with a sealing cover (8), and the periphery of the protective cover (7) is provided with a protective cylinder (6).

10. The immersed tunnel segment joint in-situ cable connection structure according to claim 1, characterized in that: The anchor head of the finished cable body (1) is provided with a force monitoring device (21), and the force monitoring device (21) is connected with a data collector (22) through a data line. The anchor head of the finished cable body (1) is provided with a force monitoring device (21), and the force monitoring device (21) is connected with a data collector (22) through a data line.

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