CN217426122U - Active balance type cable tower concrete tooth block anchoring structure - Google Patents
Active balance type cable tower concrete tooth block anchoring structure Download PDFInfo
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Abstract
The utility model provides an active balance formula cable tower concrete tooth piece anchor structure, includes cable tower main part, concrete tooth piece and anchor subassembly, the concrete tooth piece be provided with two and set up respectively in the inboard mutual disposition of cable tower main part, the anchor subassembly sets up in two on the concrete tooth piece. The application has the following expected technical effects: the invention greatly eliminates the unfavorable load of the horizontal component force of the stay cable on the cable tower concrete structure by stretching the prestressed beam arranged between two tooth blocks along the bridge direction of the cable tower, so that the cable tower structure is in the best stress state; by actively applying the balance force of the main and side-span stay cables, the circumferential prestress of the anchoring area of the concrete cable tower can be completely cancelled, and a series of problems of cutting off of main tower steel bars, inconvenience in concrete vibration, weakening of structural bearing capacity, complex construction and the like caused by the circumferential prestress in the anchoring area of the existing cable tower tooth block are solved.
Description
Technical Field
The utility model relates to concrete anchor structure, concretely relates to initiative balanced type cable tower concrete tooth piece anchor structure.
Background
Under the action of strong horizontal component force of a stay cable, the tower wall of a cable tower generates tensile stress, in order to ensure that an anchoring area of the cable tower (stay cable) has enough crack resistance and bearing capacity, the existing anchoring area of a tooth block of the cable tower bears the strong tensile force generated by the stay cable on the tower wall by arranging a U-shaped or groined prestressed beam, but the prestressed beam is too short in length particularly in the transverse bridge direction, so that the loss of the prestressed force is large, and because the passive stress state of the anchoring area of the cable tower is not fundamentally solved, the cable tower needs to arrange a large number of U-shaped or groined prestressed beams in the height direction, and the working efficiency is not high. Often can conflict with ordinary reinforcing bar again in the construction, ordinary reinforcing bar needs to cut, has not only seriously weakened the bearing capacity of column self structure, and the construction is loaded down with trivial details moreover.
Chinese patent publication No. CN106835981B discloses a self-balancing cable anchoring structure for use in piers and pylons, which includes a column for piers and pylons, and a left cable and a right cable anchored on the column. The cylinder is the hollow structure of arbitrary cross-sectional shape, sets up solid section in the cylinder in the anchor position of left side cable, right side cable, sets up trapezoidal anchor tooth piece structure on solid section upper portion. Trapezoidal anchor tooth piece structure and solid section adopt reinforced concrete structure, and the inclination on trapezoidal anchor tooth piece structure both sides limit guarantees that left side cable, right side cable can be anchored in this trapezoidal anchor tooth piece structurally perpendicularly along its axis.
This structure is direct to transmit vertical centripetal force to the cylinder through the zip, relies on structure self to bear the pulling force that the suspension cable produced, still belongs to passive stress state, causes the main tower reinforcing bar to cut off because of hoop prestressing force extrusion easily, and concrete vibrates inconveniently, structure bearing capacity weakens and a series of problems such as loaded down with trivial details of construction.
Disclosure of Invention
The utility model aims at providing a problem to prior art exists provides a initiative balanced type cable tower concrete tooth piece anchor structure.
In order to achieve the above object, the utility model adopts the following technical scheme:
an active balance type cable tower concrete tooth block anchoring structure is characterized by comprising a cable tower main body, two concrete tooth blocks and anchoring assemblies, wherein the two concrete tooth blocks are arranged on two sides of the inner wall of the cable tower main body and are arranged oppositely, and the two anchoring assemblies are arranged in two groups and are respectively positioned on the two concrete tooth blocks; the anchoring assembly comprises a stay cable anchor backing plate arranged on the inner wall of the concrete tooth block, steel beam anchoring steel plates are also vertically arranged on the concrete tooth block and are positioned on two sides of the stay cable anchor backing plate, and the bottoms of the steel beam anchoring steel plates extend into the concrete tooth block; and a prestressed tendon is also arranged between the two concrete tooth blocks, two ends of the prestressed tendon are respectively connected to the tops of the two steel tendon anchoring steel plates, and the prestressed tendon is used for applying tension to the two concrete tooth blocks.
Optionally, the concrete tooth piece is triangular prism shape and the biggest one side laminating in the inside wall of cable tower main part, two the concrete tooth piece with the center department symmetry setting of cable tower main part.
Optionally, the inside of concrete tooth piece is provided with many reinforcing bars, the one end of reinforcing bar extends to the inside of cable tower main part, the other end butt of reinforcing bar in the lateral wall of suspension cable anchor backing plate.
Optionally, the stay cable anchor backing plate is a rectangular steel plate, and the area of the stay cable anchor backing plate is smaller than half of the area of the side wall of the concrete tooth block.
Optionally, a plurality of anchor holes are formed in the steel bundle anchoring steel plate, and the anchor holes are arranged in an array at intervals.
Optionally, the prestressed tendons are composed of a plurality of low-retraction anchors, the low-retraction anchors are horizontally arranged, and two ends of the low-retraction anchors are respectively connected to the steel tendon anchoring steel plates.
Through the technical scheme, the cable tower main body and the concrete tooth blocks are matched to provide a stable installation position for the anchoring assembly, the anchoring assembly applies the prestressed beams in the two concrete tooth blocks, the adverse load of the horizontal component force of the stay cable on a cable tower concrete structure is greatly eliminated, the cable tower structure is in the best stress state, the steel beam anchoring steel plate is convenient for the installation of the prestressed beams, the stay cable anchor backing plate can effectively diffuse the stress in the tensioning process into the cable tower main body, the concentrated force is dispersed, the structure is more stable and durable, and the service life of the structure is prolonged.
The concrete tooth block is more tightly connected with the cable tower main body through the steel bar, the stability of the structure is effectively improved, the upper bearing limit of the structure is enhanced, the structure formed by matching the steel bar and the concrete has good integrity, the wrapped steel bar is not easy to corrode, and the material is easy to obtain; compared with the conventional anchorage device structure, the low-retraction anchorage device greatly reduces the retraction amount of the prestressed stranded wire after being released and tensioned, effectively reduces the prestress loss of the prestressed stranded wire and obviously improves the stress state of a web plate.
By actively applying the balance force of the main and side span stay cables, the circumferential prestress of the anchoring area of the concrete cable tower can be completely cancelled, and a series of problems of cutting off of main tower steel bars, inconvenience in concrete vibration, weakening of structural bearing capacity, fussy construction and the like caused by the circumferential prestress in the anchoring area of the tooth block of the existing cable tower are solved; the staff can arrange through the anchor point that calculates for also ensure the firm of this structure when the construction progress, reduced manual work's intensity.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the cooperation of the tower column body and the concrete tooth blocks provides a stable installation position for the anchoring assembly, the anchoring assembly installs the prestressed tendons in the two concrete tooth blocks and actively applies pulling force to the two concrete tooth blocks to tension the prestressed tendons and keep the pulling force on the two concrete tooth blocks, so that the adverse load of the horizontal component force of the stay cable on a cable tower concrete structure is greatly eliminated, the cable tower structure is in an optimal stress state, the installation of the prestressed tendons is facilitated by the steel tendon anchoring steel plate, the stay cable anchor backing plate can effectively diffuse the stress in the tensioning process into the cable tower main body to disperse the concentrated force, the structure is more stable and durable, and the service life of the structure is prolonged;
2. by actively applying the balance force of the main and side span stay cables, the circumferential prestress of the anchoring area of the concrete cable tower can be completely cancelled, and a series of problems of cutting off of main tower steel bars, inconvenience in concrete vibration, weakening of structural bearing capacity, complex construction and the like caused by the circumferential prestress in the anchoring area of the tooth block of the existing cable tower are solved.
Drawings
Fig. 1 is a schematic structural view of an active balance type cable tower concrete tooth block anchoring structure of the present invention;
in the figure: 1. a cable tower body; 2. a concrete tooth block; 3. an anchor assembly; 21. reinforcing steel bars; 31. anchoring the steel plate by the steel bundle; 32. stay cable anchor backing plates; 33. pre-stressing tendons; 331. a low recoil anchor.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, an active balance type cable tower concrete tooth block anchoring structure includes a cable tower main body 1, two concrete tooth blocks 2 and anchoring assemblies 3, wherein the two concrete tooth blocks 2 are respectively arranged on two sides of the inner wall of the cable tower main body 1 and are oppositely arranged, and the two anchoring assemblies 3 are respectively arranged on the two concrete tooth blocks 2; the anchoring component 3 comprises a stay cable anchor backing plate 32 arranged on the inner wall of the concrete tooth block 2, a steel beam anchoring steel lug plate 31 is also vertically arranged on the concrete tooth block 2, the steel beam anchoring steel lug plate 31 is arranged at two sides of the stay cable anchor backing plate 32, and the bottom of the steel beam anchoring steel lug plate 31 extends into the concrete tooth block 2; a prestressed tendon 33 is also arranged between the two concrete tooth blocks 2, two ends of the prestressed tendon 33 are respectively connected to the tops of the two steel-tendon anchoring steel ear plates 31, and the prestressed tendon 33 is used for applying tension to the two concrete tooth blocks 2; the cooperation of cable tower main part 11 and concrete tooth piece 2 provides stable mounted position for anchor subassembly 3, anchor subassembly 3 greatly eliminates the unfavorable load of horizontal component to cable tower concrete structure through applying prestressing tendons 33 in two concrete tooth pieces 2, makes the cable tower structure be in best stress state, and the installation of prestressing tendons 33 is convenient for to steel strand anchor otic placode 31, and the stress diffusion to cable tower main part 11 when the suspension cable anchor backing plate 32 can be effectively with the stretch-draw in, and the dispersed concentrated force makes the structure more firm, durable, has prolonged the life of this structure.
The inside of concrete tooth piece 2 is provided with many reinforcing bars 21, and many reinforcing bars 21 extend to the inside of cable tower main part 1, and concrete tooth piece 2 is inseparabler through reinforcing bar 21 and the 11 connections of cable tower main part, has effectively promoted the stability of this structure, has strengthened the load upper limit of this structure simultaneously, and the structure of reinforcing bar 21 and concrete collocation has fine wholeness, is difficult to corrode by the reinforcing bar 21 of parcel, and it is easy to draw materials.
The prestressed strand 33 is composed of a plurality of low retraction anchors 331, the plurality of low retraction anchors 331 are horizontally arranged, and two ends of the plurality of low retraction anchors 331 are respectively connected to the steel strand anchoring steel ear plates 31, compared with the conventional anchor structure, the low retraction anchor 331 greatly reduces the retraction amount of the prestressed strand after being released, effectively reduces the prestress loss thereof, and obviously improves the stress state of the web.
A design method of an active balance type cable tower concrete tooth block anchoring structure comprises the following steps:
(1) calculating and taking materials; calculating the horizontal component force generated by the stay cable according to a design drawing to obtain the balance force required to be provided by the prestressed tendons, obtaining the number of the required prestressed tendons through the balance force, and obtaining the size of the anchoring steel plate and the position of the anchoring opening through the number of the prestressed tendons;
(2) anchoring presetting; when the cable tower main body and the concrete tooth block are poured, the stay cable anchor backing plate and the steel beam anchor steel ear plate are arranged on the concrete tooth block in advance, and the steel beam anchor steel ear plate is arranged on two sides of the stay cable anchor backing plate;
(3) mounting and tensioning a prestressed tendon; and after the concrete tooth block reaches the design strength, installing the prestressed tendons, and tensioning the prestressed tendons for 1-4 times according to the structural stress condition to ensure that the cable tower structure has good stress condition.
By actively applying the balance force of the main and side-span stay cables, the circumferential prestress of the anchoring area of the concrete cable tower can be completely cancelled, and a series of problems of cutting off of main tower steel bars 21, inconvenience in concrete vibration, weakening of structural bearing capacity, complex construction and the like caused by the circumferential prestress in the anchoring area of the tooth block of the existing cable tower are solved.
The cable tower main body 1 and the concrete tooth block 2 form a bridge cable force T and a vertical included angle alpha between the top end of the cable tower main body 1 and a stay cable at the top end of the cable tower main body corresponding to the stay cable, and horizontal component force T generated by the stay cable is respectively calculated Level of Taking the maximum value of the two, the magnitude of the balancing force F to be provided by the tendon 33 N ＝T Level of The cross-sectional area of a single tendon 33 is measured as A P The tension control stress delta of the prestressed tendons 33 is obtained by selecting materials, and the coefficient lambda is obtained by considering the prestress loss reduction during actual operation, so that the required number of the prestressed tendons 33 is calculated
The staff can be through calculating the power value that the prestressing tendons needs according to the load numerical value, and the staff of being convenient for selects the material to prestressing tendons 33, can effectively practice thrift the cost under the firm condition of guarantee structure, can also use corresponding material in different occasions simultaneously and use.
The number of the prestressed anchorage points is determined by the number n of the prestressed tendons 33, the arrangement of the prestressed anchorage points meets the requirement of a tension space of the prestressed tendons 33, the size and the anchoring hole opening position of the steel tendon anchoring earplates 31 used are determined according to the maximum horizontal cable force of the prestressed tendons, the steel tendon anchoring earplates 31 are arranged on two sides of the stay cable anchor backing plate 32, so that the prestressed tendons 33 can be sufficiently tensioned, workers can arrange through the calculated anchoring points, the stability of the structure is guaranteed while the construction progress is accelerated, and the strength of manual operation is reduced.
When the prestressed beam 33 is stretched, stretching can be carried out for 1-4 times according to the stress condition of the structure, the good stress condition of the cable tower structure is ensured, and the nth stretching of the stay cable is carried outFront, the maximum tension value of a single cable in the stay cables on the same side is T n (ii) a When the prestressed beam is stretched, the tension force of the single low retraction anchor 331 is
The prestress of the prestressed beam 33 can fully balance the horizontal component of the stay cable after the tensioning, and when the prestressed beam 33 is tensioned before the stay cable is tensioned for the last time, the tension control stress of the single low-retraction anchor 331 is
The stress condition of the cable tower structure is calculated by calculating the prestressed tendons 33, the stability of the cable tower is further guaranteed, the service condition and the service life of the structure under different tensions can be analyzed, and the structure is convenient to further improve subsequently.
The horizontal component force of the stay cable is actively balanced by the tensile force of the prestressed beam 33, passive section resistance increasing is changed into active reduction of load bearing of the anchoring area by arranging the prestressed beam 33 close to the anchoring area of the concrete tooth block 2, the cable tower is in the best stress state, the cable tower is more stable and durable, the service life of the structure is prolonged, and the hoop prestress of the anchoring area of the concrete cable tower can be completely cancelled by actively applying the balance force of the main and side-span stay cables.
Table 1: MIDAS FEA three-dimensional entity modeling stress calculation analysis
With reference to table 1, a three-dimensional entity is established by using MIDAS FEA finite element to perform stress calculation analysis on the entity, and one segment of the upper tower column tooth block is selected in the analysis; the concrete cable tower and the tooth blocks are piled up by adopting C50 concrete, the elastic modulus is 34.5GPa, the Poisson ratio is 0.2, and only the elastic stage is considered; the tower top of the cable tower is a free end, the wall of the concrete tower extends downwards for about 3 segment heights and restricts the three-dimensional translational degree of freedom of the bottom surface, the tower column of the cable tower is coupled with the tooth block, and the stay cable and the prestress are loaded by adopting surface load. Wherein NB13 is the stay cable at the edge of the tooth block, and NZ13 is the stay cable at the middle position of the tooth block. Can improve key part through the data in table 1, choose suitable material for use to pile up, strengthen the reliability of this structure greatly, supplementary promotion design efficiency, can also reduce use cost.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. An active balance type cable tower concrete tooth block anchoring structure is characterized by comprising a cable tower main body, two concrete tooth blocks and anchoring assemblies, wherein the two concrete tooth blocks are arranged on two sides of the inner wall of the cable tower main body and are arranged oppositely, and the two anchoring assemblies are arranged in two groups and are respectively positioned on the two concrete tooth blocks; the anchoring assembly comprises a stay cable anchor backing plate arranged on the inner wall of the concrete tooth block, steel beam anchoring steel plates are also vertically arranged on the concrete tooth block and are positioned on two sides of the stay cable anchor backing plate, and the bottoms of the steel beam anchoring steel plates extend into the concrete tooth block; and a prestressed tendon is also arranged between the two concrete tooth blocks, two ends of the prestressed tendon are respectively connected to the two steel tendon anchoring steel plates, and the prestressed tendon is used for applying tension to the two concrete tooth blocks.
2. The active balance type cable tower concrete tooth block anchoring structure as claimed in claim 1, wherein the concrete tooth blocks are triangular prism shaped, and the largest one surface of the concrete tooth blocks is attached to the inner side wall of the cable tower main body, and the two concrete tooth blocks are symmetrically arranged at the center of the cable tower main body.
3. The active balance type cable tower concrete tooth block anchoring structure according to claim 1, wherein a plurality of steel bars are disposed inside the concrete tooth block, one end of each steel bar extends into the cable tower main body, and the other end of each steel bar abuts against an outer side wall of the stay cable anchor backing plate.
4. The active balance type cable tower concrete tooth block anchoring structure as claimed in claim 1, wherein the stay cable anchor backing plate is a rectangular steel plate, and the area of the stay cable anchor backing plate is smaller than half of the area of the concrete tooth block side wall.
5. The active balance type cable tower concrete tooth block anchoring structure as claimed in claim 4, wherein a plurality of anchor holes are arranged on the steel bundle anchoring steel plate, and the anchor holes are arranged in an array at intervals.
6. The active balance type cable tower concrete tooth block anchoring structure as claimed in claim 5, wherein the pre-stressed tendons are composed of a plurality of low retraction anchors, the plurality of low retraction anchors are horizontally arranged at intervals, and two ends of each low retraction anchor are respectively connected to the anchor holes on the two steel tendon anchoring steel plates.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220200179.5U CN217426122U (en) | 2022-01-25 | 2022-01-25 | Active balance type cable tower concrete tooth block anchoring structure |
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| CN202220200179.5U CN217426122U (en) | 2022-01-25 | 2022-01-25 | Active balance type cable tower concrete tooth block anchoring structure |
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| CN217426122U true CN217426122U (en) | 2022-09-13 |
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| CN202220200179.5U Active CN217426122U (en) | 2022-01-25 | 2022-01-25 | Active balance type cable tower concrete tooth block anchoring structure |
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