CN113463515B - Construction method of double-sealing inhaul cable anchorage device - Google Patents
Construction method of double-sealing inhaul cable anchorage device Download PDFInfo
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- CN113463515B CN113463515B CN202110810034.7A CN202110810034A CN113463515B CN 113463515 B CN113463515 B CN 113463515B CN 202110810034 A CN202110810034 A CN 202110810034A CN 113463515 B CN113463515 B CN 113463515B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
A construction method for dual-sealing stay cable anchorage device is characterized in that all gaps between an anchor hole and a stay cable are wrapped and sealed by all sealing parts of a sealing device assembly at the front end of the anchorage device to form a plurality of sealing layers. The invention has the advantages of good sealing effect, difficult leakage of the anticorrosive filler inside the anchorage device, difficult entry of external corrosive liquid into the anchorage device and convenient installation.
Description
Technical Field
The invention relates to the technical field of bridge guy cables, in particular to a construction method of a double-sealing guy cable anchorage.
Background
The cable bridge is an important form in bridge construction, and utilizes a cable (steel strand) fixed between a bridge body and a bridge column, the weight of the bridge body is transmitted to the bridge column through the cable, and the bridge column bears the weight of most of the bridge body. The cable bridge has the advantages of long spanning distance, saving bridge building materials, light bridge body weight and the like, and is widely applied to bridge construction.
The connection point of the stay cable and the steel column or the bridge body is mainly realized through a stay cable anchorage device, and the stay cable anchorage device always keeps a fastening clamping occlusion state on the end part of the stay cable. The surface of cable uses the polyethylene sheath to protect usually, can prevent that natural environment from to the corruption destruction of cable, and the combination position of cable and ground tackle is corroded weak link, takes place the cable inefficacy for preventing the junction of cable and ground tackle from taking place the corrosion, takes place the risk of ground tackle inefficacy, and then influences the holistic safety of bridge, increases the cost that the bridge inspection was maintained, and the sealed of ground tackle is the key. Usually, cement mortar, epoxy resin or foaming organic materials are injected into the sealing barrel for filling and corrosion prevention, a sealing ring is adopted at the opening of the barrel, the sealing material is jacked by a bolt jacking rod to deform to realize sealing of the anchorage device, and the jacking mode of the bolt is adopted, so that the deformation of the sealing material is inconsistent due to nonuniform stress, and the sealing effect of the anchorage device is poor.
The prior art is queried about sealed cable anchors as follows:
1. a detachable sealing structure of a guy cable anchorage and a method for realizing anchorage sealing; application No.: cn201410042487.x; the applicant: ovumm mechanical, liuzhou GmbH; and (3) abstract: a detachable sealing structure of a guy cable anchorage device comprises a sealing structure at the anchor head end and a sealing structure in the anchor head end, wherein the sealing structure at the anchor head end comprises an anchor plate, a base plate and an O-shaped sealing ring I arranged on the base plate; the sealing structure in the anchor head comprises a sealing cylinder, and a pressing plate, an inner sealing plate, a pressure-bearing cushion sleeve, an O-shaped sealing ring II, a sealing cushion sleeve and an outer sealing plate which are sequentially arranged in the sealing cylinder; the connecting piece comprises a pressing rod, a pressing screw and a tensioning screw; the compression rod penetrates through a through hole II in the anchor plate and a compression plate straight through hole II to reach a blind hole I of the inner sealing plate, and the compression plate is clamped by the annular shoulder; the compression screw is tightly attached to the compression rod and used for jacking the compression rod; the pressing rod presses the pressing plate; one end of the pressure-bearing cushion sleeve is tightly attached to the pressing plate to be pressed, and the other end of the pressure-bearing cushion sleeve is tightly attached to the sealing cushion sleeve to extrude the sealing cushion sleeve. The detachable sealing structure of the guy cable anchorage device is reliable in sealing, can be disassembled and assembled for many times, is easy to maintain and operate, and can also realize single replacement of a steel strand.
The above publications disclose detachable sealing structure of inhaul cable anchorage device and method for sealing anchorage device, which is to compress cylindrical sealing ring to seal anchorage device, but the compressive grip force of cylindrical sealing ring is not enough to achieve bad sealing effect, and the sealing structure is only provided with sealing ring to seal circumferential direction, so that the sealing effect is not good.
Disclosure of Invention
The invention aims to provide a construction method of a double-sealing inhaul cable anchorage device, which has the advantages of good sealing effect, difficulty in leakage of anticorrosive filler inside the anchorage device, difficulty in entering of external corrosive liquid inside the anchorage device and convenience in installation.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention provides a double-sealing inhaul cable anchorage device and a method for realizing anchorage device sealing. The installation and construction steps are as follows:
sealing structure of A-installation anchor
Sequentially installing an anchor plate, a base plate and a sealing cylinder; firstly, placing a sealing material I in a groove of a base plate, tightly attaching an anchor plate to one surface of the base plate with the sealing material I, screwing bolts into threaded holes in the base plate after penetrating through holes of the anchor plate, and symmetrically and crossly screwing the bolts; the other end of the base plate is in threaded connection with the sealing cylinder, and the connecting surface is coated with a sealing material II.
B installation sealing device
The outer sealing plate, the sealing ring, the sealing sleeve, the front pressing plate, the middle sealing plate and the rear pressing plate are sequentially arranged. One end of the outer sealing plate, on which the sealing ring is arranged, is horizontally placed on the ground upwards, the sealing ring is arranged in a hole of the outer sealing plate, through which the steel strand penetrates, the sealing sleeve is sleeved, the front pressing plate, the middle sealing plate and the rear pressing plate are sequentially arranged, and hole positions of the pressing plate and the middle sealing plate correspond to hole positions of the outer sealing plate one by one. And sequentially passing the bolt through the pressure plate, the middle sealing plate and the pressure plate and screwing the pressure plate into the threaded hole of the outer sealing plate to integrate the sealing device. A sealing material III is sleeved in the groove on the excircle of the outer sealing plate;
one end of the pressure rod is sleeved in the cap-shaped nut and the sealing gasket, the other end of the pressure rod sequentially penetrates through the sealing device, the sealing cylinder and the backing plate, penetrates out of the anchor plate, is sleeved in the disc spring and is screwed in the nut, hole sites of the sealing device correspond to hole sites of the anchor plate one by one, and the anchorage device is installed.
C double-sealing inhaul cable anchorage construction
The steel strand with the PE stripped sequentially penetrates through the sealing device, the sealing cylinder, the base plate and the anchor plate hole to be installed into the clamping piece for anchoring;
the construction method of the anticorrosion material in the anchorage device has two methods, one is to prefabricate a wax cake, the size of the wax cake is consistent with the size of the inner cavity of the anchorage device, the hole site arrangement is consistent with the external sealing hole site, and the wax cake is firstly put into the anchorage device in a factory. And the second method is that after the cable anchorage device is tensioned and anchored, pull rod nuts at the end of the anchor plate are symmetrically screwed down, so that a sealing ring and a middle sealing plate in a sealing device are compressed and deformed to seal the inner cavity of the anchorage device. And then pouring the anticorrosive material from the anchor plate pouring hole, and filling the sealing material when the sealing material overflows from all the clamping pieces. And after the end face of the anchor plate and the steel strand are coated with the anti-corrosion grease or the non-drying anti-corrosion sealant or sprayed with the oily wax, the protective cover is installed.
A double-sealing stay cable anchorage device is characterized in that a plurality of anchor holes are formed in an anchor plate at the anchor end of the anchorage device, a stay cable which is clamped and penetrates by a clamping piece is arranged in each anchor hole, a sealing cylinder and a backing plate are arranged in the middle of the anchorage device, and a hollow cavity formed by the sealing cylinder and the backing plate is filled with an anticorrosive material; the tensioning end of the anchorage device is sealed by a sealing device assembly, the sealing device assembly sequentially comprises an outer sealing plate, a front pressing plate, a middle sealing plate and a rear pressing plate from front to back, the parts are provided with a corresponding number of anchor holes, and a stay cable penetrates through the anchor holes; the pull rod penetrates through the length of the whole anchor, the end of the outer sealing plate is tightly pressed and fixed through the sealing gasket and the cap nut, and the end of the anchor plate is sleeved with the disc spring and screwed tightly through the nut;
the bolt penetrates through the unthreaded holes of the front pressure plate, the middle sealing plate and the rear pressure plate and is in sliding connection, the head of the bolt is fixedly connected with the outer sealing plate through threads, and a gap is formed between the front pressure plate and the outer sealing plate; and a sealing ring and a sealing sleeve are arranged at the anchor hole of the outer sealing plate, the front end of the sealing sleeve props up the end face of the sealing ring tightly, and the rear end of the sealing sleeve props up the end face of the front pressing plate tightly.
After the pull rod is tensioned, the outer sealing plate is extruded towards the direction of the front pressing plate, the gap between the front pressing plate and the outer sealing plate is reduced by compression, the sealing ring and the sealing sleeve are extruded and deformed, and the outer surface of the stay cable is gradually wrapped, so that the stay cable hole is sealed, external corrosive liquids such as rainwater cannot enter the sealing cylinder, and the anticorrosive material in the sealing cylinder cannot leak out of the anchor. The antiseptic material can be antiseptic grease, oily wax, and non-drying antiseptic sealing paste.
In addition, the middle sealing plate is made of rubber or foam materials, plastic deformation is good, the shape of the anchor hole is changed after the middle sealing plate is extruded by the front and rear pressing plates, the diameter of the anchor hole is reduced, and the molding materials wrap the surface of the inhaul cable to achieve the effect of sealing the anchor hole.
The two ends of the section of the middle shaft of the sealing ring are large, the middle of the section of the middle shaft is small, and the shape of the section of the middle shaft is elliptical. When the both ends tip received the extrusion, the middle part is to the extrusion deformation of inner chamber direction, the surface of wrapping up in the cable, and the outside expansion of both ends is out of shape, and the interior round surface in extrusion anchor eye consequently packs the clearance between cable and the anchor eye completely sealedly, and sealed effect is better.
The excircle of the outer sealing plate is provided with a plurality of grooves, and sealing materials III are placed in the grooves and can be water-swelling rubber rings or rubber rings.
The contact part of the outer circle of the sealing cylinder and the inner circle of the base plate is in threaded connection, and a sealing material II is arranged. The sealing material II can be silicone sealant, polysulfide sealant or thread sealant.
A sealing material I is arranged at the contact part of the rear end face of the base plate and the anchor plate; the sealing material I can be sealing putty, water-swelling rubber sealing strips, silicone sealing glue, polysulfide sealing glue or thread sealing glue.
The invention has the advantages that:
1. the invention discloses a double-sealing inhaul cable anchorage device. The sealing device comprises an outer sealing plate, a sealing ring, a sealing sleeve, a middle sealing plate, a pressure plate and the like, wherein one or more grooves are formed in the excircle of the outer sealing plate for placing sealing materials, and the sealing device can be extruded to realize double sealing inside and outside the sealing device; the sealing ring is in an elliptical shape with large ends and small middle, and the sealing ring in the shape is more powerful in gripping force after being extruded and better in sealing effect.
2. One end of the pull rod is sleeved with the cover-shaped nut and the sealing gasket, the other end of the pull rod penetrates through the sealing device, the end face of the anchor plate penetrates out of the sealing device, the disc spring screwed in nut compression sealing gasket and the sealing device are sleeved in the end face of the anchor plate, double sealing of the pull rod and an inner cavity of the anchor device is achieved, meanwhile, the sealing device holes and the anchor plate holes are in one-to-one correspondence positioning effect, installation is facilitated, and later-stage cable penetrating is facilitated.
3. The connecting surface of the backing plate and the anchor plate is provided with a groove for placing a sealing material, and the sealing material can be sealing putty, a water-swelling rubber sealing strip, silicone sealant, polysulfide sealant or thread sealant, so that the sealing between the anchor plate and the backing plate is realized. The connecting end face of the base plate and the sealing cylinder is provided with a sealing material which can be silicone sealant, polysulfide sealant or thread sealant, so that the sealing between the base plate and the sealing cylinder is realized, and moisture is prevented from entering the anchorage device.
4. The middle sealing plate material can be made of rubber or foam material, so that the plastic deformation is good, and the compression deformation sealing effect is better.
Description of the drawings:
FIG. 1 is a schematic view of the final assembly of the present invention;
FIG. 2 is a schematic view of the structure of FIG. 1 along the direction A;
FIG. 3 is a schematic view of the structure of FIG. 1 along the direction B;
FIG. 4 is a schematic cross-sectional view of the seal assembly;
FIG. 5 is a schematic view of the structure of FIG. 4 in direction C;
FIG. 6 is a cross-sectional view of the bottom bracket of the seal ring;
the numbers and component names in the figure are: 1. a clip; 2. an anchor plate; 21. an isolation ring; 22. a separator plate; 3. sealing material I; 4. a backing plate; 5. a sealing material II; 6. an anticorrosive material; 7. a sealing cylinder; 8. a sealing device assembly; 81. an outer seal plate; 82. a sealing material III; 83. a seal ring; 84. sealing sleeves; 85. a compression plate; 851. a front compression plate; 852. a rear pressure strip; 86. a middle sealing plate; 9. a gasket; 10. a pull rod.
Detailed Description
Example 1
A construction method of a double-sealing inhaul cable anchorage device comprises the following steps:
sealing structure of A-installation anchor
Sequentially installing an anchor plate, a base plate and a sealing cylinder; firstly, placing a sealing material I in a groove of a base plate, tightly attaching an anchor plate to one surface of the base plate with the sealing material I, screwing bolts into threaded holes in the base plate after penetrating through holes of the anchor plate, and symmetrically and crossly screwing the bolts; the other end of the base plate is in threaded connection with the sealing cylinder, and the connecting surface is coated with a sealing material II;
b installation sealing device
And an outer sealing plate, a sealing ring, a sealing sleeve, a front pressing plate, a middle sealing plate and a rear pressing plate are sequentially arranged. One end of the outer seal plate, on which the seal ring is arranged, is horizontally placed on the ground upwards, the seal ring is arranged in a hole of the outer seal plate, through which the steel strand penetrates, the seal sleeve is sleeved, the front pressure plate, the middle seal plate and the rear pressure plate are sequentially arranged, and the hole positions of the pressure plate and the middle seal plate correspond to the hole positions of the outer seal plate one by one. And sequentially passing the bolt through the pressing plate, the middle sealing plate and the pressing plate and screwing the pressing plate into the threaded hole of the outer sealing plate to connect the sealing devices into a whole. A sealing material III is sleeved in the groove on the outer circle of the outer sealing plate;
one end of the pressure lever is sleeved in the cap nut and the sealing gasket, the other end of the pressure lever penetrates through the sealing device, the sealing cylinder and the backing plate in sequence, penetrates through the anchor plate, is sleeved in the disc spring and is screwed in the nut, hole sites of the sealing device correspond to hole sites of the anchor plate one by one, and the anchorage device is installed;
c double sealing inhaul cable anchorage construction
The steel strand with the PE stripped sequentially penetrates through the sealing device, the sealing cylinder, the base plate and the anchor plate hole to be installed into the clamping piece for anchoring;
the construction method of the anti-corrosion material in the anchorage device is that wax cakes are prefabricated, the size of the wax cakes is consistent with the size of an inner cavity of the anchorage device, the hole site arrangement is consistent with the outer sealing hole site, and the wax cakes are firstly put into the anchorage device in a factory; after the end face of the anchor plate and the steel strand are coated with the anti-corrosion grease, the non-drying anti-corrosion sealant or the oil wax, the protective cover is installed.
In the double-seal inhaul cable anchorage device, a plurality of anchor holes are formed in an anchor plate 2 at the anchor head end of the anchorage device, a clamping piece 1 is arranged in each anchor hole to clamp an inhaul cable which penetrates through the anchor hole, a sealing cylinder 7 and a backing plate 4 are arranged in the middle of the anchorage device, and a hollow cavity formed by the sealing cylinder 7 and the backing plate 4 is filled with an anticorrosive material 6; the anchorage device stretching end is sealed through a sealing device assembly 8, the sealing device assembly 8 sequentially comprises an outer sealing plate 81, a front pressing plate 851, a middle sealing plate 86 and a rear pressing plate 852 from front to back, the parts are provided with a corresponding number of anchor holes, and an inhaul cable penetrates through the anchor holes; the pull rod 10 penetrates through the length of the whole anchor, the end of the outer sealing plate 81 is tightly pressed and fixed through the sealing gasket 9 and the cap nut, and the end of the anchor plate 2 is sleeved with a disc spring and screwed tightly through the nut;
the bolt penetrates through the unthreaded holes of the front pressure plate 851, the middle sealing plate 86 and the rear pressure plate 852 and is connected in a sliding manner, the head of the bolt is fixedly connected with the outer sealing plate 81 through threads, and a gap exists between the front pressure plate 851 and the outer sealing plate 81; a sealing ring 83 and a sealing sleeve 84 are arranged at the anchor hole of the outer sealing plate 81, the front end of the sealing sleeve 84 tightly props against the end surface of the sealing ring 83, and the rear end of the sealing sleeve 84 tightly props against the end surface of the front pressure plate 851;
the middle sealing plate is made of rubber.
The section of the middle shaft of the sealing ring 83 is in an oval shape with two large ends and a small middle;
a plurality of grooves are formed in the contact part of the inner circle of the sealing cylinder 7 and the outer circle of the outer sealing plate 81, sealing materials III 82 are placed in the grooves, and the sealing materials III 82 are water-swelling rubber rings;
the outer circle of the sealing cylinder 7 is in threaded connection with the contact part of the inner circle of the backing plate 4, and a sealing material II 5 is arranged; the sealing material II is silicone sealant.
A sealing material I3 is arranged at the contact part of the rear end face of the backing plate 4 and the anchor plate 2; the sealing material I is sealing putty.
Example 2
A construction method of a double-sealing inhaul cable anchorage device comprises the following steps:
sealing structure of A-installation anchor
Sequentially installing an anchor plate, a base plate and a sealing cylinder; firstly, placing a sealing material I in a groove of a base plate, tightly attaching an anchor plate to one surface of the base plate with the sealing material I, screwing bolts into threaded holes in the base plate after penetrating through holes of the anchor plate, and symmetrically and crossly screwing the bolts; the other end of the base plate is in threaded connection with the sealing cylinder, and the connecting surface is coated with a sealing material II;
b installation sealing device
And an outer sealing plate, a sealing ring, a sealing sleeve, a front pressing plate, a middle sealing plate and a rear pressing plate are sequentially arranged. One end of the outer sealing plate, on which the sealing ring is arranged, is horizontally placed on the ground upwards, the sealing ring is arranged in a hole of the outer sealing plate, through which the steel strand penetrates, the sealing sleeve is sleeved, the front pressing plate, the middle sealing plate and the rear pressing plate are sequentially arranged, and hole positions of the pressing plate and the middle sealing plate correspond to hole positions of the outer sealing plate one by one. And sequentially passing the bolt through the pressure plate, the middle sealing plate and the pressure plate and screwing the pressure plate into the threaded hole of the outer sealing plate to integrate the sealing device. A sealing material III is sleeved in the groove on the excircle of the outer sealing plate;
one end of the pressure lever is sleeved in the cap-shaped nut and the sealing gasket, the other end of the pressure lever sequentially penetrates through the sealing device, the sealing cylinder and the backing plate, penetrates out of the anchor plate, is sleeved in the disc spring and is screwed in the nut, hole sites of the sealing device correspond to hole sites of the anchor plate one by one, and the anchorage device is installed;
c double-sealing inhaul cable anchorage construction
The steel strand with the PE stripped sequentially penetrates through the sealing device, the sealing cylinder, the base plate and the anchor plate hole to be installed into the clamping piece for anchoring;
the construction method of the anticorrosive material in the anchorage device comprises the steps of after tensioning and anchoring the inhaul cable anchorage device, symmetrically screwing down pull rod nuts at the end of an anchor plate, and enabling a sealing ring and a middle sealing plate in a sealing device to be compressed and deformed to realize sealing of an inner cavity of the anchorage device; then pouring the anticorrosive material from the anchor plate pouring hole, and filling the sealing material when the sealing material overflows from all the clamping pieces; after the end face of the anchor plate and the steel strand are coated with anticorrosive grease or non-drying anticorrosive sealant or sprayed with oily wax, a protective cover is installed; the anticorrosive material is anticorrosive grease.
In the double-seal inhaul cable anchorage device, a plurality of anchor holes are formed in an anchor plate 2 at the anchor head end of the anchorage device, a clamping piece 1 is arranged in each anchor hole to clamp an inhaul cable which penetrates through the anchor hole, a sealing cylinder 7 and a backing plate 4 are arranged in the middle of the anchorage device, and a hollow cavity formed by the sealing cylinder 7 and the backing plate 4 is filled with an anticorrosive material 6; the anchorage device stretching end is sealed through a sealing device assembly 8, the sealing device assembly 8 sequentially comprises an outer sealing plate 81, a front pressing plate 851, a middle sealing plate 86 and a rear pressing plate 852 from front to back, the parts are provided with a corresponding number of anchor holes, and an inhaul cable penetrates through the anchor holes; the pull rod 10 penetrates through the length of the whole anchor, the end of the outer sealing plate 81 is tightly pressed and fixed through the sealing gasket 9 and the cap nut, and the end of the anchor plate 2 is sleeved with a disc spring and screwed tightly through the nut;
the bolt penetrates through the unthreaded holes of the front pressure plate 851, the middle sealing plate 86 and the rear pressure plate 852 and is connected in a sliding manner, the head of the bolt is fixedly connected with the outer sealing plate 81 through threads, and a gap exists between the front pressure plate 851 and the outer sealing plate 81; a sealing ring 83 and a sealing sleeve 84 are arranged at the anchor hole of the outer sealing plate 81, the front end of the sealing sleeve 84 tightly props against the end surface of the sealing ring 83, and the rear end of the sealing sleeve 84 tightly props against the end surface of the front pressure plate 851;
the middle sealing plate is made of foaming material,
the section of the middle shaft of the sealing ring 83 is in an oval shape with two large ends and a small middle;
a plurality of grooves are formed in the contact part of the inner circle of the sealing cylinder 7 and the outer circle of the outer sealing plate 81, sealing materials III 82 are placed in the grooves, and the sealing materials III 82 can be water-swelling rubber rings;
the outer circle of the sealing cylinder 7 is in threaded connection with the contact part of the inner circle of the backing plate 4, and a sealing material II 5 is arranged; the sealing material II can be polysulfide sealant.
A sealing material I3 is arranged at the contact part of the rear end face of the backing plate 4 and the anchor plate 2; the sealing material I is a water-swelling rubber sealing strip.
Example 3
A construction method of a double-sealing inhaul cable anchorage device comprises the following steps:
sealing structure of A-shaped installation anchor
Sequentially installing an anchor plate, a base plate and a sealing cylinder; firstly, placing a sealing material I in a groove of a base plate, tightly attaching an anchor plate to one surface of the base plate with the sealing material I, screwing bolts into threaded holes in the base plate after penetrating through holes of the anchor plate, and symmetrically and crossly screwing the bolts; the other end of the base plate is in threaded connection with the sealing cylinder, and the connecting surface is coated with a sealing material II;
b installation sealing device
The outer sealing plate, the sealing ring, the sealing sleeve, the front pressing plate, the middle sealing plate and the rear pressing plate are sequentially arranged. One end of the outer sealing plate, on which the sealing ring is arranged, is horizontally placed on the ground upwards, the sealing ring is arranged in a hole of the outer sealing plate, through which the steel strand penetrates, the sealing sleeve is sleeved, the front pressing plate, the middle sealing plate and the rear pressing plate are sequentially arranged, and hole positions of the pressing plate and the middle sealing plate correspond to hole positions of the outer sealing plate one by one. And sequentially passing the bolt through the pressing plate, the middle sealing plate and the pressing plate and screwing the pressing plate into the threaded hole of the outer sealing plate to connect the sealing devices into a whole. A sealing material III is sleeved in the groove on the excircle of the outer sealing plate;
one end of the pressure lever is sleeved in the cap nut and the sealing gasket, the other end of the pressure lever penetrates through the sealing device, the sealing cylinder and the backing plate in sequence, penetrates through the anchor plate, is sleeved in the disc spring and is screwed in the nut, hole sites of the sealing device correspond to hole sites of the anchor plate one by one, and the anchorage device is installed;
c double-sealing inhaul cable anchorage construction
The steel strand with the PE stripped sequentially penetrates through the sealing device, the sealing cylinder, the base plate and the anchor plate hole to be installed into the clamping piece for anchoring;
the construction method of the anticorrosive material in the anchorage device comprises the steps of after tensioning and anchoring the inhaul cable anchorage device, symmetrically screwing down pull rod nuts at the end of an anchor plate, and enabling a sealing ring and a middle sealing plate in a sealing device to be compressed and deformed to realize sealing of an inner cavity of the anchorage device; then pouring an anticorrosive material from the anchor plate pouring hole, and filling the sealing material when the sealing material overflows from all the clamping pieces; after the end face of the anchor plate and the steel strand are coated with anti-corrosion grease or non-drying anti-corrosion sealant or sprayed with oily wax, a protective cover is installed; the anti-corrosion material is non-drying anti-corrosion sealant.
According to the double-sealing inhaul cable anchorage device, a plurality of anchor holes are formed in an anchor plate 2 at the anchor end of the anchorage device, an inhaul cable which is clamped and penetrates by a clamping piece 1 is arranged in each anchor hole, a sealing cylinder 7 and a backing plate 4 are arranged in the middle of the anchorage device, and a hollow cavity formed by the sealing cylinder 7 and the backing plate 4 is filled with an anticorrosive material 6; the stretching end of the anchorage device is sealed through a sealing device assembly 8, the sealing device assembly 8 comprises an outer sealing plate 81, a front compression plate 851, a middle sealing plate 86 and a rear compression plate 852 from front to back in sequence, the outer sealing plate 81, the front compression plate 851, the middle sealing plate 86 and the rear compression plate 852 are all provided with a corresponding number of anchor holes, and a guy cable penetrates through the anchor holes; the pull rod 10 penetrates through the length of the whole anchor, the end of the outer sealing plate 81 is tightly pressed and fixed through the sealing gasket 9 and the cap nut, and the end of the anchor plate 2 is sleeved with a disc spring and screwed tightly through the nut;
the bolt penetrates through the unthreaded holes of the front pressure plate 851, the middle sealing plate 86 and the rear pressure plate 852 and is in sliding connection, the head of the bolt is fixedly connected with the outer sealing plate 81 through threads, and a gap exists between the front pressure plate 851 and the outer sealing plate 81; a sealing ring 83 and a sealing sleeve 84 are arranged at the anchor hole of the outer sealing plate 81, the front end of the sealing sleeve 84 tightly props against the end surface of the sealing ring 83, and the rear end of the sealing sleeve 84 tightly props against the end surface of the front pressing plate 851;
the middle sealing plate 86 is made of rubber;
the section of the middle shaft of the sealing ring 83 is in an oval shape with two large ends and a small middle;
a plurality of grooves are formed in the contact part of the inner circle of the sealing cylinder 7 and the outer circle of the outer sealing plate 81, sealing materials III 82 are placed in the grooves, and the sealing materials III 82 can be water-swelling rubber rings;
the outer circle of the sealing cylinder 7 is in threaded connection with the contact part of the inner circle of the backing plate 4, and a sealing material II 5 is arranged; the sealing material II can be a thread sealing glue.
A sealing material I3 is arranged at the contact part of the rear end face of the backing plate 4 and the anchor plate 2; the sealing material I is silicone sealant.
The application example is as follows:
for the double-sealing stay cable anchorage device, the experimental process is as described in appendix E in JT/T771-2009 technical conditions for unbonded steel strand stay cables: the anchor sealing experiment method is used for carrying out dynamic sealing experiments.
The diameter of each strand of steel strand is 19mm, the sealing ring 83 is made of rubber materials, and the sealing sleeve 84 is made of nylon materials. The diameter of an anchor hole in the middle of the sealing ring 83 is 19.5mm, the outer diameter of anchor holes at two ends is 27.5mm, the thickness is 4mm, and the length is 50mm;
the clearance between preceding pressure strip 851 and the outer sealing plate 81 is 50mm, and preceding pressure strip 851 and back pressure strip 852 are the nylon material, and well closing plate 86 is the rubber material, and thickness is 40mm, and its anchor eye diameter is 20mm.
The experimental process comprises the following steps:
(1) The test piece is arranged on a sealing test bed, the adjustment quantity of the transverse deflection angle of the steel strand is ensured to be +/-25 mrad (+/-1.4 degrees), and the temperature of the colored water can be adjusted between 16 ℃ and 56 ℃;
(2) Applying 30% 402to the test strand at ambient temperature ptk Then injecting colored water with the height of 5 meters into the cylinder barrel;
(3) Keeping the water temperature at 16 ℃ unchanged, and applying a stress upper limit value of 45 percent 402to the steel strand ptk Unloading to the lower stress limit value of 20 percent 402 ptk The load is increased from the lower limit value to the upper limit value and then decreased to the lower limit value for one cycle, and the test is repeated for 10 cycles.
(4) Holding the load stress at 30% \402 ptk After the water temperature is regulated from the lower limit value to the upper limit value of 56 ℃ without changing,then, the temperature is adjusted back to 16 ℃ for one period, and the cycle is repeated for 8 periods.
(5) In the step (4), respectively selecting the lowest temperature of 16 ℃ and the highest temperature of 56 ℃ twice, keeping the temperature unchanged, and changing the deflection angle of the steel strand at the tensioning end by using a transverse jack, wherein the angle change range is +/-25 mrad (+/-1.4 degrees) in 250 cycles each time, and the angle change frequency is not more than 1Hz.
After the experiment, the anchorage device is dismantled, the interior of the anchorage device and the steel strand are observed, and a small amount of colored water marks appear around the steel strand between the front pressure plate 851 and the outer sealing plate 81 in the anchorage device; the double sealing of the present invention can maintain the inside of the sealing barrel inside the anchorage device in completely sealed state.
Claims (5)
1. A construction method of a double-sealing inhaul cable anchorage device is characterized by comprising the following steps:
sealing structure of A-shaped installation anchor
Sequentially installing an anchor plate, a base plate and a sealing cylinder; firstly, placing a sealing material I in a groove of a backing plate, tightly attaching an anchor plate to one surface of the backing plate with the sealing material I, screwing a bolt into a threaded hole in the backing plate after penetrating through the anchor plate hole, and symmetrically and crossly screwing the bolt; the other end of the base plate is in threaded connection with the sealing cylinder, and a sealing material II is coated on the connecting surface;
b installation sealing device
An outer sealing plate, a sealing ring, a sealing sleeve, a front pressing plate, a middle sealing plate and a rear pressing plate are sequentially arranged; one end of the outer seal plate, which is provided with the seal ring, is horizontally placed on the ground upwards, the seal ring is arranged in a hole of the outer seal plate, which penetrates through the steel strand, then the seal sleeve is sleeved, and then the front pressure plate, the middle seal plate and the rear pressure plate are sequentially arranged, wherein hole sites of the pressure plate and the middle seal plate correspond to hole sites of the outer seal plate one by one; a bolt sequentially penetrates through the pressing plate, the middle sealing plate and the pressing plate and is screwed into the threaded hole of the outer sealing plate, so that the sealing devices are connected into a whole; a sealing material III is sleeved in the groove on the outer circle of the outer sealing plate;
one end of the pressure lever is sleeved in the cap nut and the sealing gasket, the other end of the pressure lever penetrates through the sealing device, the sealing cylinder and the backing plate in sequence, penetrates through the anchor plate, is sleeved in the disc spring and is screwed in the nut, hole sites of the sealing device correspond to hole sites of the anchor plate one by one, and the anchorage device is installed;
c double sealing inhaul cable anchorage construction
The steel strand with the PE stripped sequentially penetrates through the sealing device, the sealing cylinder, the base plate and the anchor plate hole to be installed into the clamping piece for anchoring;
the construction method of the anti-corrosive material in the anchorage device comprises two construction methods, one is to prefabricate a wax cake, the size of the wax cake is consistent with the size of the inner cavity of the anchorage device, the hole site arrangement is consistent with the external sealing hole site, and the wax cake is firstly put into the anchorage device in a factory; the second is that after the guy cable anchorage device is tensioned and anchored, the pull rod nuts at the end of the anchor plate are symmetrically screwed down, so that the sealing ring and the middle sealing plate in the sealing device are compressed and deformed to realize the sealing of the inner cavity of the anchorage device; then pouring the anticorrosive material from the anchor plate pouring hole, and filling the sealing material when the sealing material overflows from all the clamping pieces; after the end face of the anchor plate and the steel strand are coated with anti-corrosion grease or non-drying anti-corrosion sealant or sprayed with oily wax, a protective cover is installed;
the anchor plate (2) at the anchor end of the double-seal inhaul cable anchorage is provided with a plurality of anchor holes, a clamping piece (1) is arranged in each anchor hole to clamp the inhaul cable which passes through, the middle part of the anchorage is provided with a seal barrel (7) and a backing plate (4), and a hollow cavity formed by the seal barrel (7) and the backing plate (4) is filled with an anticorrosive material (6); the anchor tensioning end is sealed through a sealing device assembly (8), the sealing device assembly (8) sequentially comprises an outer sealing plate (81), a front compression plate (851), a middle sealing plate (86) and a rear compression plate (852) from left to right, the outer sealing plate (81), the front compression plate (851), the middle sealing plate (86) and the rear compression plate (852) are provided with a corresponding number of anchor holes, and the inhaul cable penetrates through the anchor holes; the pull rod (10) penetrates through the length of the whole anchor, the end of the outer sealing plate (81) is tightly pressed and fixed through the sealing gasket (9) and the cover-shaped nut, and the end of the anchor plate (2) is sleeved with the disc spring and screwed tightly through the nut;
the bolt penetrates through unthreaded holes of the front pressure plate (851), the middle sealing plate (86) and the rear pressure plate (852) and is in sliding connection, the head of the bolt is fixedly connected with the outer sealing plate (81) through threads, and a gap exists between the front pressure plate (851) and the outer sealing plate (81); a sealing ring (83) and a sealing sleeve (84) are arranged at an anchor hole of the outer sealing plate (81), the front end of the sealing sleeve (84) is tightly propped against the end surface of the sealing ring (83), the rear end of the sealing sleeve (84) is tightly propped against the end surface of the front pressing plate (851), and a sealing material III (82) is arranged in an excircle groove of the outer sealing plate (81);
the section of the middle shaft of the sealing ring (83) is in an oval shape with two large ends and a small middle.
2. The construction method of the double seal cable anchor of claim 1, wherein: the contact position of the inner circle of the sealing cylinder (7) and the outer circle of the outer sealing plate (81) is provided with a plurality of grooves, sealing materials III (82) are placed in the grooves, and the sealing materials III (82) are water-swelling rubber rings.
3. The construction method of the double seal cable anchor of claim 1, wherein: the outer circle of the sealing cylinder (7) is in threaded connection with the contact part of the inner circle of the backing plate (4), and a sealing material II (5) is arranged; the sealing material II (5) is a silicone sealant, a polysulfide sealant or a thread sealant.
4. The method of constructing a dual seal cable anchor of claim 1, wherein: a sealing material I (3) is arranged at the contact part of the rear end surface of the backing plate (4) and the anchor plate (2); the sealing material I (3) is sealing putty, a water-swelling rubber sealing strip, a silicone sealing glue, a polysulfide sealing glue or a thread sealing glue.
5. The method of constructing a dual seal cable anchor of claim 1, wherein: the middle sealing plate (86) is made of rubber or foaming materials.
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