CN113235436A - Temporary inhaul cable construction method suitable for cable-first and beam-second construction of suspension bridge - Google Patents
Temporary inhaul cable construction method suitable for cable-first and beam-second construction of suspension bridge Download PDFInfo
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- CN113235436A CN113235436A CN202110467438.0A CN202110467438A CN113235436A CN 113235436 A CN113235436 A CN 113235436A CN 202110467438 A CN202110467438 A CN 202110467438A CN 113235436 A CN113235436 A CN 113235436A
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- 238000010276 construction Methods 0.000 title claims abstract description 66
- 239000000725 suspension Substances 0.000 title claims abstract description 23
- 238000004873 anchoring Methods 0.000 claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 25
- 239000010959 steel Substances 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000009434 installation Methods 0.000 claims abstract description 12
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 27
- 230000008569 process Effects 0.000 claims description 22
- 230000007246 mechanism Effects 0.000 claims description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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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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- 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
- E01D11/02—Suspension 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
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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Abstract
The invention discloses a construction method for installing, tensioning and releasing a temporary inhaul cable suitable for cable-first and beam-second construction of a self-anchored suspension bridge, wherein the temporary inhaul cable is made of a steel strand and a steel wire rope or parallel steel wires, one end of the temporary inhaul cable is made into a fork ear structure to form a fixed connecting end, the other end of the temporary inhaul cable is made into a tensioning structure with an adjustable nut, a traction system is formed by a winch, a traction cable, a tackle and a lifting ring, the temporary zip lock is erected by utilizing a bearing rope arranged between an anchorage and an anchoring beam, the problems of limited beam bottom space and difficult installation at high altitude above water are solved, the cost is saved, and the construction efficiency is improved. A tensioning and releasing system is formed by the tensioning supporting angle, the penetrating jack, the tensioning nut, the tensioning screw and the extension rod, so that multiple graded tensioning and releasing of the temporary zipper are realized, the construction is safe and convenient, and the construction precision is ensured.
Description
Technical Field
The invention relates to the field of temporary inhaul cable construction methods suitable for cable-first and beam-second construction of suspension bridges. More particularly, the present invention relates to a temporary cable construction method suitable for a suspension bridge first cable and then beam construction, which is easy to construct.
Background
The self-anchored suspension bridge usually adopts a construction process of ' cable first and beam second ', the process needs to set up a large number of supports in a channel to construct a main girder of an upper structure, but when the construction process is influenced by factors such as channel navigation limitation, the supports cannot be set up in the channel, so a new idea is provided for design and construction, the construction process of the cable first and the beam second ' takes place, the axial force of a main cable is transmitted to a temporary anchorage by setting the temporary anchorage and a temporary stay cable, and finally the temporary anchorage is dismantled by system conversion, and the axial force of the main cable is transferred into the main girder.
The temporary anchorage is usually arranged in a shallow water area or on land, the temporary guy cable needs to cross over a water area because of connecting the main beam and the temporary anchorage, and is usually installed by adopting hoisting equipment such as a floating crane, or a construction platform is erected and is installed by adopting large-scale mobile hoisting equipment, so that the construction cost is higher; meanwhile, due to the limitation of the space of the bottom of the anchored beam, the lifting hook of the hoisting equipment cannot directly reach the anchoring point of the bottom of the temporary guy cable, and the hoisting equipment cannot freely move due to the long temporary guy cable, so that the temporary guy cable is difficult to be drawn into the anchor from the upper water after the beam end is anchored; how to guarantee that interim cable is quick smooth installation is the problem that needs further research.
Disclosure of Invention
In order to achieve these objects and other advantages according to the present invention, there is provided a temporary guy cable construction method suitable for a suspension bridge cable-first-and-beam construction, comprising the steps of constructing and constructing an anchor beam, a cable tower, a temporary anchorage, and installing a temporary guy cable between the temporary anchorage and the anchor beam, further comprising the steps of:
the method comprises the following steps that firstly, erection of a traction cable and a bearing cable is completed, one end of the bearing cable is connected to a temporary anchorage, the other end of the bearing cable is connected to a lower anchor point of the bearing cable, one end of the traction cable is connected to the temporary anchorage, the other end of the traction cable penetrates through a traction steering mechanism and then is rotatably connected to a steering pulley, and the steering pulley is arranged on the temporary anchorage;
secondly, the temporary inhaul cable is positioned in the cable disc, one end of an upper anchor head of the temporary inhaul cable is connected to the moving mechanism, the traction cable is also connected to the moving mechanism, the moving mechanism moves along the bearing cable along with the traction of the winch, and then the upper anchor head of the temporary inhaul cable is pulled to an anchoring point to be fixed;
thirdly, temporarily anchoring the lower end anchor head of the temporary inhaul cable, and finishing the installation of the temporary inhaul cable;
and step four, starting a winch to recover the traction rope, and preliminarily dismantling the moving mechanism.
According to a preferred embodiment of the present invention, in the third step, during the anchoring process of the lower end anchor head of the temporary guy cable, the displacement of the lower end anchor head of the temporary guy cable and the tension of the temporary guy cable during the anchoring process are monitored in real time.
According to a preferred embodiment of the invention, the temporary guy comprises a cable body integrated by a plurality of steel strands, steel wires or parallel steel wires, one end of which is made as a fixed connection end, i.e. the upper anchor head, and the other end of which is made as an adjustable tensioning end, i.e. the lower anchor head, in order to adapt to the deformation of the temporary guy.
According to a preferred embodiment of the invention, in the third step, the remaining temporary guy cable in the cable disc is released, an extension bar is installed at the lower end anchor head of the temporary guy cable, and when the lower end anchor head of the temporary guy cable is anchored, the extension bar is also partially anchored for the temporary guy cable tensioning and releasing operation, wherein the extension bar is exposed out of the anchoring surface for 1-2 meters.
According to a preferred embodiment of the present invention, the moving mechanism includes a trolley and a hanging ring connected to the trolley through a sling, the trolley slides along the load-bearing cable, the hanging ring is connected to the lower portion of the trolley, the hanging ring is used for catching the temporary cable, and the sling is fixedly connected to the traction cable.
According to a preferred embodiment of the invention, the temporary inhaul cable comprises a cable body, one end of the cable body penetrates through the upper end connecting cylinder assembly and is anchored on an upper end anchor plate inside the upper end anchor cup, the upper end anchor plate is connected with the fork-shaped lug plate, the other end of the temporary inhaul cable penetrates through the lower end connecting cylinder assembly and is anchored on a lower end anchor plate inside the lower end anchor cup, an annular anchor backing plate is annularly arranged outside the lower end anchor cup, a first spherical hinge plate is annularly and movably arranged at the bottom end of the anchor backing plate, a second spherical hinge plate is annularly arranged outside the lower end anchor cup, and the second spherical hinge plate rotates in the first spherical hinge plate under the external driving action so as to adapt to the displacement deformation of the temporary inhaul cable.
According to a preferred embodiment of the invention, an anchor head nut is sleeved outside the lower end anchor cup, the length of a temporary inhaul cable can be adjusted through the anchor head nut so as to adjust the length error of the suspension cable caused by manufacturing and construction and meet the requirement of construction tensioning, an annular water drainage groove is arranged on the anchor head nut, one end of the annular water drainage groove is communicated with the lower end anchor cup, the other end of the annular water drainage groove is communicated with the outside, and water flowing down along the surface of the lower end anchor cup is guided;
and the tensioning supporting angle is arranged on the anchor backing plate and is provided with a water diversion hole, and the lower end anchor cup, the first spherical hinge plate, the second spherical hinge plate and the anchor head nut are all sleeved with the tensioning supporting angle.
According to a preferred embodiment of the present invention, the upper end connecting cylinder assembly/the lower end connecting cylinder assembly is hollow, the interior of the upper end connecting cylinder assembly/the lower end connecting cylinder assembly is filled with epoxy iron sand, and the exterior of the lower end connecting cylinder assembly is further sleeved with an embedded steel conduit.
According to a preferred embodiment of the invention, the lower end anchor head of the temporary inhaul cable is temporarily anchored, which specifically comprises the following operations:
step S31, arranging a pre-buried guide pipe in a temporary anchorage, installing a reducing sleeve in an anchor head at the lower end, connecting one end of a tensioning screw rod in the reducing sleeve through an external thread, connecting the other end of the tensioning screw rod with the extension rod through an internal thread, penetrating a temporary guy cable through the pre-buried guide pipe in the temporary anchorage, sequentially installing an anchor backing plate, a first spherical hinge plate, a second spherical hinge plate, an anchor head nut and a limiting nut outside the temporary anchorage when the extension rod penetrates through the pre-buried guide pipe of the temporary anchorage, then installing the tensioning angle and a jack, and installing a first tensioning nut and a second tensioning nut at the rear end of the jack;
step S32, starting a jack oil pump to extend the jack and start tensioning, and driving the extension bar, the tensioning screw and the lower end anchor cup to move outwards along with the continuous extension of the jack; stopping tensioning after one stroke of the jack is finished, wherein the first tensioning nut is stressed and screws the anchor head nut on the tensioning screw inwards;
step S33, after the anchor head nut is screwed down, a jack oil pump is started, the jack starts to retract, the limit nut is stressed at the moment, the jack stroke is completely retracted, and the first pulling nut is screwed inwards;
step S34, when the extension bar extends out completely and the tensioning screw can be connected with the second tensioning nut, removing the first tensioning nut and the extension bar; at the moment, the jack is stressed by the tensioning nut when being tensioned by screwing the second tensioning nut inwards, the limiting nut is screwed outwards at the same time, and the anchor head nut is screwed inwards, so that the jack is stressed by the anchor head nut when being retracted;
and step S35, when the temporary guy cable is stretched to a design value, the stretching brace angle, the jack, the second stretching nut, the stretching screw rod and the limiting nut can be disassembled.
According to a preferred embodiment of the present invention, the temporarily anchoring the lower end anchor head of the temporary stay further comprises the following operations:
step S36, installing a reducing sleeve in the lower end anchor head, connecting the lower end anchor head with a tensioning screw rod through the reducing sleeve, connecting an extension rod with the tensioning screw rod in a threaded manner, penetrating a temporary guy cable through a temporary anchorage and an embedded conduit, and installing an anchor backing plate, a spherical hinge device, an anchor head nut and a limiting nut close to the rear anchor surface; then installing a tensioning supporting angle and a jack; and a first tensioning nut and a second tensioning nut are arranged behind the jack.
Step S37, starting a jack oil pump to extend the jack and start tensioning; at the moment, the first tensioning nut works, the extension bar, the tensioning screw and the lower end anchor head are driven to move outwards along with the continuous extension of the jack, the tensioning is stopped after one stroke of the jack is finished, and the first tensioning nut is stressed and is screwed inwards to a limit nut on the tensioning screw;
step S38, after the limit nut is screwed, the jack oil pump is started, the jack starts to retract, at the moment, the limit nut is stressed, and the jack stroke is completely retracted to inwards screw the first pulling nut;
step S39, repeating the steps S37 and S38; when the extension bar extends out completely and the tensioning screw can be connected with a second tensioning nut, removing the first tensioning nut and the extension bar; at the moment, the jack is stressed by the second tensioning nut when being tensioned by screwing the second tensioning nut inwards, the limit nut is screwed outwards at the same time, and the anchor head nut is screwed inwards, so that the jack is stressed by the anchor head nut when being retracted;
and step S40, when the temporary guy cable is stretched to a designed value, removing the stretching brace angle, the jack, the second stretching nut, the stretching screw rod and the limiting nut.
The invention at least comprises the following beneficial effects: in the construction process of the cable-first beam-second suspension bridge, the temporary inhaul cable is hung by using the traction system formed by the winch, the bearing cable and the traction cable, so that the problems of limited beam bottom space and high-altitude installation on water are solved, the cost is saved, and the construction efficiency is improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic view of installation of an anchoring beam, a cable tower, a temporary anchorage and a temporary guy cable in the invention.
Fig. 2 is a schematic diagram of erection and installation of the traction cable and the bearing cable in the first step of the invention.
FIG. 3 is a drawing process of the temporary cable in the second step of the invention.
Fig. 4 is a schematic view of the process of anchoring the upper end anchor head of the temporary stay cable at the anchoring point by using the chain block in the invention.
Fig. 5 is a schematic view of the process of anchoring the lower end anchor head of the temporary guy cable to the temporary anchorage in the present invention.
Fig. 6 is a schematic view illustrating the anchoring process of the extension rod in the present invention.
Fig. 7 is a schematic structural view of the moving mechanism of the present invention.
Fig. 8 is a schematic view A-A and a schematic view B-B of the temporary inhaul cable in the invention.
Fig. 9 is a structural schematic view of a lower half section of the temporary guy cable in fig. 7.
Fig. 10 is a structural schematic diagram of an upper half section of the temporary cable in fig. 7.
Fig. 11 is an anchoring schematic view of anchoring the lower end anchor head of the temporary guy cable to the temporary anchorage in the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
As shown in fig. 1 to 11, the temporary guy cable construction method suitable for the construction of a suspension bridge first cable and then beam comprises the following steps of constructing and building an anchoring beam 1 and a cable tower 2, constructing and building a temporary anchorage 3, and installing a temporary guy cable 4 between the temporary anchorage 3 and the anchoring beam 1, and further comprises the following steps:
step one, erecting a traction cable 5 and a bearing cable 6, wherein one end of the bearing cable 6 is connected to a temporary anchorage 3, the other end of the bearing cable 6 is connected to a lower anchorage point of the bearing cable 6, one end of the traction cable 5 is connected to the temporary anchorage 3, the other end of the traction cable passes through a traction steering mechanism 7, and then the traction cable is rotatably connected to a steering pulley 8, and the steering pulley 8 is arranged on the temporary anchorage 3;
secondly, the temporary inhaul cable 4 is located in a cable disc 9, one end of an anchor head at the upper end of the temporary inhaul cable 4 is connected to a moving mechanism 8, the traction cable is also connected to the moving mechanism 8, the moving mechanism 8 moves along the bearing cable 6 along with the traction of the traction cable 5 by a winch 12, and then the anchor head at the upper end of the temporary inhaul cable 4 is pulled to an anchoring point 11 to be fixed;
thirdly, temporarily anchoring the lower end anchor head of the temporary inhaul cable 4, and at the moment, finishing the installation of the temporary inhaul cable 4;
and step four, starting a winch to recover the traction rope 5, and preliminarily dismantling the moving mechanism.
In the construction process of a suspension bridge with a cable first and a beam second, a temporary guy cable 4 is needed, the temporary guy cable 4 is used for connecting the temporary anchorage 3 with the anchoring beam 1, the main cable force in the construction process is transmitted to the temporary anchorage 3, and the temporary guy cable 4 can be tensioned and adjusted according to the horizontal force generated by the main cable 5 in the construction process so as to eliminate the unbalanced horizontal force at the anchoring beam in the construction process. However, in the construction process, due to the limitation of the space of the bottom of the anchoring beam and the difficulty of high-altitude installation on water, the installation process of the temporary guy cable is very difficult, and the installation cost is very high, so the embodiment provides a construction scheme of the temporary guy cable, the temporary guy cable can be anchored and installed by directly combining the winch, the bearing cable 6 and the traction cable 5 between the original temporary guy anchor 3 and the cable tower 2, the space limitation is avoided, and the installation is quicker and more convenient.
In consideration of the tensioning quality of the temporary guy cable 4, sometimes, the temporary guy cable is damaged due to over-tensioning and uneven stress, and in the anchoring process of the lower end anchor head of the temporary guy cable 4, the displacement of the lower end anchor head of the temporary guy cable 4 and the tensioning force of the temporary guy cable 4 in the anchoring process are monitored in real time.
In another preferred construction embodiment, the temporary stay 4 includes a cable body 41, one end of which is made into a fixed connection end, i.e., the upper end anchor head, and the other end of which is made into an adjustable tension end, i.e., the lower end anchor head, so as to adapt to the deformation of the temporary stay, the cable body is composed of a plurality of steel strands, steel wire ropes or parallel steel wires, and the temporary stay 4 can completely draw and twist a plurality of steel wires together to form a whole, so that the construction is more convenient.
As shown in fig. 8-10, the temporary cable 4 comprises a cable body 41, one end of which passes through an upper connecting cylinder assembly 42, an upper anchor plate 44 anchored inside an upper anchor cup 43, the upper anchor plate 44 is connected to a fork-shaped ear plate 45, the other end of the temporary cable 4 passes through a lower connecting cylinder assembly 46 and is anchored on a lower anchor plate 48 inside a lower anchor cup 47, an annular anchor backing plate 49 is arranged outside the lower anchor cup 47, a first spherical hinge plate 410 is arranged at the bottom end of the anchor backing plate 49 in an annular mode, a second spherical hinge plate 411 is arranged outside the lower anchor cup 47 in an annular mode, and the second spherical hinge plate 411 rotates in the first spherical hinge plate under the driving of the outside so as to adapt to the displacement and deformation of the temporary cable. The outer surface of the lower end anchor cup 47 is provided with external threads, the outer part of the lower end anchor cup 47 is also sleeved with a nut 414, the length of the temporary inhaul cable can be adjusted by rotating and adjusting the anchor head nut 414, and the length error of the inhaul cable caused by manufacturing, construction and the like can be adjusted. By setting the rotation between the first ball hinge plate 410 and the second ball hinge plate 411, the deformation of the temporary stay is adapted.
Here, interim cable adopts steel strand wires, wire rope or parallel steel wire to process the preparation, and fork ear structure is makeed into to one end, forms fixed connection end, and the adjustable tension structure of nut is makeed into to one end, conveniently carries out the stretch-draw operation, makes the atress of structure clear and definite, and system conversion operation is simpler, and the easy monitoring of work progress has ensured construction safety. The temporary inhaul cable is directly installed on site after being processed and manufactured in a factory, so that the time occupation in the field installation process is reduced, and the installation progress is accelerated.
The cable body 41 is composed of a plurality of steel strands, steel wire ropes or parallel steel wires. The steel strand, steel wire rope or parallel steel wire adopts
The standard value of the tensile strength of the galvanized high-strength steel wire is not less than 1770 MPa.
During actual construction, the length of the temporary guy cable 4 is obtained by fine calculation according to construction conditions before construction, and then is prefabricated to a specific length in a factory in advance, the length of the temporary guy cable 4 cannot be changed in the construction process, in order to ensure the tightness and rigidity of the temporary guy cable 4 after being anchored and tensioned, the length of the temporary guy cable 4 cannot be set to be too long, so that after two ends of the temporary guy cable are anchored, the temporary guy cable 4 cannot be in a tight state, and subsequent construction cannot be carried out, therefore, the length of the temporary guy cable 4 is slightly shorter than the length just achieving the rigidity, after an upper end anchor head of the temporary guy cable is anchored at an anchoring point, the temporary guy cable 4 remaining in the cable disc 9 is released by using the crane 14, the extension rod 10 is installed at a lower end anchor head of the temporary guy cable 4, and when the lower end anchor head of the temporary guy cable 4 is anchored, anchoring the extension rod 10, wherein the extension rod 10 is exposed out of the anchoring surface by 1-2 m, and the specific anchoring step of the extension rod 10 is as follows, anchoring part of the extension rod 10 into the temporary anchorage 3, and then temporarily fixing the extension rod 10 outside the temporary anchorage 3 by using a temporary nut 15. And extension bar 14 is the rigid structure, makes things convenient for exerting oneself during follow-up stretch-draw anchor.
In another preferred embodiment, in the second step, when the anchor head at the upper end of the temporary cable 4 is pulled to be close to the anchoring point, the chain block 13 is used to pull the temporary cable 4 to continuously pull the temporary cable 4 to the anchoring point on the cable tower 2, so as to fix the temporary cable on the anchoring point.
In another preferred embodiment, the temporary cable construction method suitable for the cable-first and beam-second construction of the suspension bridge is characterized in that the moving mechanism 8 comprises a pulley 81 and a lifting ring 83 connected to the pulley 81 through a lifting cable 82, the pulley 81 slides along the bearing cable 6, the lifting ring 83 is connected below the pulley 81, the lifting ring 83 is used for catching the temporary cable 4, and the lifting cable 82 is fixedly connected to the traction cable 5.
According to a preferred embodiment of the present invention, in the temporary cable construction method suitable for the cable-first-beam-second-beam construction of the suspension bridge, the interior of the lower end connecting cylinder assembly 46 of the upper end connecting cylinder assembly 42 is hollow, and the interior of the lower end connecting cylinder assembly is filled with the epoxy iron sand 412, so that a good buffering effect can be provided, and the bending fatigue influence of the temporary cable can be improved. The embedded steel conduit 413 is further sleeved outside the lower end connecting cylinder assembly 46.
According to a preferred embodiment of the invention, in the temporary cable construction method suitable for the suspension bridge front-to-back beam construction, the anchor head nut 414 is provided with an annular water drainage groove 415, one end of the annular water drainage groove 415 is communicated with the lower end anchor cup 47, and the other end of the annular water drainage groove 415 is communicated with the outside, so that water flowing down along the surface of the lower end anchor cup is guided;
and a tension brace 416 mounted on the anchor backing plate 49 and covering the lower end anchor cup 47, the first spherical hinge plate 410, the second spherical hinge plate 411 and the anchor head nut 414, wherein the tension brace 416 has a water guide hole 417.
The lower end anchor head of the temporary inhaul cable is temporarily anchored, and the tensioning process of the temporary inhaul cable is specifically operated as follows:
step S31, arranging a pre-buried guide pipe 16 in a temporary anchorage 3, installing a reducing sleeve in an anchor head at the lower end of a temporary guy cable, connecting one end of a tensioning screw rod into the reducing sleeve through an external thread, connecting the other end of the tensioning screw rod 17 into the extension rod 10 through an internal thread, penetrating the temporary guy cable into the pre-buried guide pipe 16 in the temporary anchorage 3, when the extension rod 10 penetrates through the pre-buried guide pipe of the temporary anchorage 2, sequentially installing an anchor backing plate 49, a first spherical hinge plate 410, a second spherical hinge plate 411, an anchor head nut 414 and a limiting nut 21 outside the temporary anchorage, then installing a tensioning angle 416 and a jack 18, and installing a first tensioning nut 9 and a second tensioning nut 20 at the rear end of the jack 18;
step S32, starting a jack oil pump to extend the jack 18, starting tensioning, and driving the extension bar 10, the tensioning screw 17 and the lower end anchor cup 47 to move outwards along with the continuous extension of the jack; when one stroke of the jack 18 is completed, stopping tensioning, wherein the first tensioning nut 9 is stressed and screws the anchor head nut 414 on the tensioning screw 17 inwards;
step S33, after the anchor head nut 414 is screwed, the jack oil pump is started, the jack 18 starts to retract, at the moment, the limit nut 21 is stressed, the jack stroke is completely retracted, and the first pulling nut 9 is screwed inwards;
step S34, when the extension bar 10 is completely extended and the tension screw 17 can be connected with the second tension nut 20, removing the first tension nut and the extension bar 10; at the moment, the jack is stressed by depending on the second tensioning nut when in tensioning by screwing the second tensioning nut inwards, the limit nut 21 is screwed outwards at the same time, and the anchor head nut 414 is screwed inwards, so that the jack is stressed by depending on the anchor head nut 21 when retracting;
step S35, when the temporary guy cable 4 is stretched to a design value, the stretching brace 416, the jack, the second stretching nut 20, the stretching screw 17, and the anchor head nut 414 may be removed.
Carry out interim anchor with the lower extreme anchor head of interim cable, still include following operation:
step S36, installing a reducing sleeve in the lower end anchor head of the temporary guy cable 4, connecting the lower end anchor head with a tensioning screw rod through the reducing sleeve, connecting the extension rod 10 with the tensioning screw rod 17 through threads, penetrating the temporary guy cable 4 through the temporary anchorage 3 and the embedded guide pipe 16, and installing an anchor backing plate 49, a spherical hinge device, an anchor head nut 414 and a limit nut 21 tightly attached to the rear anchor surface; then installing a tensioning supporting angle 416 and a jack 18; behind the jack 18 a first tensioning nut 9 and a second tensioning nut 20 are mounted. The spherical hinge device comprises the first spherical hinge plate and the second spherical hinge plate.
Step S37, starting an oil pump of the jack 18 to extend the jack 18 and start tensioning; at the moment, the first tension nut 9 works, the extension bar 10, the tension screw 17 and the lower end anchor head are driven to move outwards along with the continuous extension of the jack, when one stroke of the jack 18 is finished, the tension is stopped, the first tension nut 9 is stressed at the moment, and the limit nut 21 on the tension screw 17 is screwed inwards;
step S38, after the limit nut 21 is screwed, starting the oil pump of the jack 18, enabling the jack 18 to retract, and at the moment, the limit nut 21 is stressed to enable the jack 18 to retract completely to inwards screw the first tensioning nut 9;
step S39, repeating the steps S37 and S38; when the extension bar 10 is completely extended and the tensioning screw 17 can be connected with a second tensioning nut 20, the first tensioning nut 9 and the extension bar 10 are removed; at the moment, the jack 18 is stressed by the second tensioning nut 20 when being tensioned by screwing the second tensioning nut 20 inwards, meanwhile, the limit nut 21 is screwed outwards, and the anchor head nut is screwed inwards, so that the jack 18 is stressed by the anchor head nut when being retracted;
step S40, when the temporary guy cable 4 is stretched to a designed value, the stretching brace angle 416, the jack 18, the second stretching nut 20, the stretching screw 17 and the limiting nut 21 are removed.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
1. A temporary inhaul cable construction method suitable for construction of a suspension bridge with cables firstly and then beams comprises the following steps of constructing and building an anchoring beam and a cable tower, constructing and building a temporary anchorage, and installing a temporary inhaul cable between the temporary anchorage and the anchoring beam, and is characterized by further comprising the following steps:
the method comprises the following steps that firstly, erection of a traction cable and a bearing cable is completed, one end of the bearing cable is connected to a temporary anchorage, the other end of the bearing cable is connected to a lower anchor point of the bearing cable, one end of the traction cable is connected to the temporary anchorage, the other end of the traction cable penetrates through a traction steering mechanism and then is rotatably connected to a steering pulley, and the steering pulley is arranged on the temporary anchorage;
secondly, the temporary inhaul cable is positioned in the cable disc, one end of an upper anchor head of the temporary inhaul cable is connected to the moving mechanism, the traction cable is also connected to the moving mechanism, the moving mechanism moves along the bearing cable along with the traction of the winch, and then the upper anchor head of the temporary inhaul cable is pulled to an anchoring point to be fixed;
thirdly, temporarily anchoring the lower end anchor head of the temporary inhaul cable, and finishing the installation of the temporary inhaul cable;
and step four, starting a winch to recover the traction rope, and preliminarily dismantling the moving mechanism.
2. The construction method of the temporary stay cable suitable for the construction of the front cable and the back beam of the suspension bridge as claimed in claim 1, wherein in the third step, the displacement of the lower anchor head of the temporary stay cable and the tension of the temporary stay cable during the anchoring process are monitored in real time.
3. The construction method of a temporary stay cable suitable for the construction of a cable-first and a beam-second of a suspension bridge according to claim 1, wherein the temporary stay cable comprises a cable body integrated by a plurality of steel strands, steel wire ropes or parallel steel wires, one end of which is made as a fixed connection end, i.e. the upper end anchor head, and the other end of which is made as an adjustable tensioning end, i.e. the lower end anchor head, so as to adapt to the deformation of the temporary stay cable.
4. The construction method of temporary guy cable suitable for construction of suspension bridge cable-first and beam-second as claimed in claim 1, wherein in the third step, the temporary guy cable remaining in the cable tray is released, and an extension bar is installed at the lower end anchor head of the temporary guy cable, and when the lower end anchor head of the temporary guy cable is anchored, the extension bar is also partially anchored for temporary guy cable tensioning and releasing operation, wherein the extension bar is exposed 1-2 m from the anchoring surface.
5. The method as claimed in claim 1, wherein the moving mechanism comprises a block and a lifting ring connected to the block through a cable, the block slides along the load-bearing cable, the lifting ring is connected to a lower portion of the block, the lifting ring is used for catching the temporary cable, and the cable is fixedly connected to the traction cable.
6. The method for constructing temporary guy cables suitable for construction of a front cable and a rear beam of a suspension bridge as claimed in claim 4, wherein the temporary guy cables comprise cable bodies, one end of each temporary guy cable passes through the upper connecting cylinder assembly and is anchored on the upper anchor plate in the upper anchor cup, the upper anchor plate is further connected with the fork-shaped ear plate, the other end of each temporary guy cable passes through the lower connecting cylinder assembly and is anchored on the lower anchor plate in the lower anchor cup, an annular anchor backing plate is annularly arranged outside the lower anchor cup, a first spherical hinge plate is annularly and movably arranged at the bottom end of the anchor backing plate, a second spherical hinge plate is annularly arranged outside the lower anchor cup, and the second spherical hinge plate rotates in the first spherical hinge plate under external driving so as to adapt to displacement and deformation of the temporary guy cables.
7. The method for constructing the temporary stay cable suitable for the construction of the front cable and the back beam of the suspension bridge as claimed in claim 6, wherein an anchor head nut is further sleeved outside the lower anchor cup, the length of the temporary stay cable can be adjusted through the anchor head nut so as to adjust the length error of the stay cable caused by manufacturing and construction and meet the construction tensioning requirement, an annular water drainage groove is formed in the anchor head nut, one end of the annular water drainage groove is communicated with the lower anchor cup, the other end of the annular water drainage groove is communicated with the outside, and water flowing down along the surface of the lower anchor cup is guided;
and the tensioning supporting angle is arranged on the anchor backing plate and is provided with a water diversion hole, and the lower end anchor cup, the first spherical hinge plate, the second spherical hinge plate and the anchor head nut are all sleeved with the tensioning supporting angle.
8. The temporary cable construction method suitable for cable-first and beam-second construction of a suspension bridge according to claim 7, wherein the upper end connection cylinder assembly/the lower end connection cylinder assembly is hollow inside, epoxy iron sand is filled inside, and an embedded steel guide pipe is further sleeved outside the lower end connection cylinder assembly.
9. The temporary stay construction method suitable for suspension bridge cable-first-and-beam construction according to claim 8, wherein the lower anchor head of the temporary stay is temporarily anchored by the following specific operations:
step S31, arranging a pre-buried guide pipe in a temporary anchorage, installing a reducing sleeve in an anchor head at the lower end of a temporary guy cable, connecting one end of a tensioning screw rod into the reducing sleeve through an external thread, connecting the other end of the tensioning screw rod with a lengthening rod through an internal thread, penetrating the temporary guy cable into the pre-buried guide pipe in the temporary anchorage, sequentially installing an anchor backing plate, a first spherical hinge plate, a second spherical hinge plate, an anchor head nut and a limiting nut outside the temporary anchorage when the lengthening rod penetrates through the pre-buried guide pipe of the temporary anchorage, then installing a tensioning supporting angle and a jack, and installing a first tensioning nut and a second tensioning nut at the rear end of the jack;
step S32, starting a jack oil pump to extend the jack and start tensioning, and driving the extension bar, the tensioning screw and the lower end anchor cup to move outwards along with the continuous extension of the jack; stopping tensioning after one stroke of the jack is finished, wherein the first tensioning nut is stressed and screws the anchor head nut on the tensioning screw inwards;
step S33, after the anchor head nut is screwed down, a jack oil pump is started, the jack starts to retract, the limit nut is stressed at the moment, the jack stroke is completely retracted, and the first pulling nut is screwed inwards;
step S34, when the extension bar extends out completely and the tensioning screw can be connected with the second tensioning nut, removing the first tensioning nut and the extension bar; at the moment, the jack is stressed by the tensioning nut when being tensioned by screwing the second tensioning nut inwards, the limiting nut is screwed outwards at the same time, and the anchor head nut is screwed inwards, so that the jack is stressed by the anchor head nut when being retracted;
and step S35, when the temporary guy cable is stretched to a design value, the stretching brace angle, the jack, the second stretching nut, the stretching screw rod and the limiting nut can be disassembled.
10. The construction method of temporary stay cable suitable for construction of cable-first and beam-second of suspension bridge as claimed in claim 9, wherein the temporary stay cable is temporarily anchored at its lower end anchor head, further comprising the operations of:
step S36, a reducing sleeve is arranged in the lower end anchor head of the temporary inhaul cable, the lower end anchor head is connected with the tensioning screw rod through the reducing sleeve,
connecting the extension bar with a tensioning screw in a threaded manner, penetrating the temporary guy cable through the temporary anchorage and the embedded guide pipe, and installing an anchor backing plate, a spherical hinge device, an anchor head nut and a limiting nut on the rear anchor surface in a manner of being tightly attached to the rear anchor surface; then installing a tensioning supporting angle and a jack; a first tensioning nut and a second tensioning nut are arranged behind the jack;
step S37, starting a jack oil pump to extend the jack and start tensioning; at the moment, the first tensioning nut works, the extension bar, the tensioning screw and the lower end anchor head are driven to move outwards along with the continuous extension of the jack, the tensioning is stopped after one stroke of the jack is finished, and the first tensioning nut is stressed and is screwed inwards to a limit nut on the tensioning screw;
step S38, after the limit nut is screwed, the jack oil pump is started, the jack starts to retract, at the moment, the limit nut is stressed, and the jack stroke is completely retracted to inwards screw the first pulling nut;
step S39, repeating the steps S37 and S38; when the extension bar extends out completely and the tensioning screw can be connected with a second tensioning nut, removing the first tensioning nut and the extension bar; at the moment, the jack is stressed by the second tensioning nut when being tensioned by screwing the second tensioning nut inwards, the limit nut is screwed outwards at the same time, and the anchor head nut is screwed inwards, so that the jack is stressed by the anchor head nut when being retracted;
and step S40, when the temporary guy cable is stretched to a designed value, removing the stretching brace angle, the jack, the second stretching nut, the stretching screw rod and the limiting nut.
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| CN202110467438.0A CN113235436A (en) | 2021-04-28 | 2021-04-28 | Temporary inhaul cable construction method suitable for cable-first and beam-second construction of suspension bridge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114622724A (en) * | 2022-02-16 | 2022-06-14 | 中国建筑第二工程局有限公司 | Control structure and control method for realizing stay bar verticality control through stay cable tensioning |
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