CN106702896A - Prestressed steel strands contained main tower and construction method thereof - Google Patents

Prestressed steel strands contained main tower and construction method thereof Download PDF

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Publication number
CN106702896A
CN106702896A CN201611086990.0A CN201611086990A CN106702896A CN 106702896 A CN106702896 A CN 106702896A CN 201611086990 A CN201611086990 A CN 201611086990A CN 106702896 A CN106702896 A CN 106702896A
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CN
China
Prior art keywords
steel
tower
king
prestressed strand
shaped steel
Prior art date
Application number
CN201611086990.0A
Other languages
Chinese (zh)
Inventor
林晚兰
余祥亮
王伟臣
徐伦
潘东发
吴方明
涂满明
毛伟琦
Original Assignee
中铁大桥局集团有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 中铁大桥局集团有限公司 filed Critical 中铁大桥局集团有限公司
Priority to CN201611086990.0A priority Critical patent/CN106702896A/en
Publication of CN106702896A publication Critical patent/CN106702896A/en

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Classifications

    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/14Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges

Abstract

The invention relates to the field of bridge design and discloses a prestressed steel strands contained main tower. The prestressed steel strands contained main tower is characterized in that a dragline anchorage zone is arranged at the top end of the main tower, at least one set of presstressed steel strands is arranged in the dragline anchorage zone, each set of presstressed steel strands includes four strands of J-shaped steel strands located on the same vertical surface and arranged at intervals, the upper and lower J-shaped steel strands of each set of the prestressed steel strands are first group of the steel strands while two J-shaped steel strands in the middle are second group of the steel strands, the two J-shaped steel strands in the first group of the steel strands and the second group of the steel strands are symmetrically arranged along the horizontal direction of a bridge, and the first group of the steel strands and the second group of the steel strands are symmetrically arranged along the longitudinally direction of the bridge. The invention further discloses a construction method of the presstressed steel strands contained main tower. By the arrangement, stability of the dragline anchorage zone of the main tower can be effectively improved.

Description

King-tower containing prestressed strand and the construction method containing prestressed strand king-tower

Technical field

The present invention relates to Bridge Design field, and in particular to a kind of king-tower containing prestressed strand and one kind are answered containing pre- The construction method of power steel beam king-tower.

Background technology

Anchor-hold area as Cable stayed Bridge Main Tower core, for the locally concentrated forces of suspension cable uniformly to be transmitted To whole king-tower structure.King-tower is typically formed using concreting, in order to balance the drawing that suspension cable is produced in anchor-hold area Stress, while ensureing that anchor-hold area has enough crack resistance and ultimate bearing capacities, is generally provided with ring in anchor-hold area To prestressed strand, the prestressed strand in anchor-hold area is typically using " well " font or the arrangement form of " u "-shaped, such as Fig. 1 With shown in Fig. 2.

Fining twisted steel or steel strand wires being used the prestressed strand of " well " font arrangement, shorter per Shu Changdu, steel beam exists more During prestressed stretch-draw, the caused loss of prestress relative value of anchor deformation, reinforcing bar retraction is larger, steel beam it is effective pre- Stress is relatively difficult to ensure card, and steel beam, when being arranged using " well " font, the required anchorage for using is more, and tensioning groove is corresponding also more, Draw workload big, larger difficulty is brought to construction.

The prestressed strand of " u "-shaped arrangement, because steel beam bending angle reaches 180 °, when prestressed stretch-draw is carried out, such as By the way of one-end tension, prestressing loss due to friction is larger, such as by the way of the tensioning of two ends, anchor deformation and steel The loss of prestress that muscle retraction causes is larger, and the effective prestress of steel beam is difficult to control to, simultaneously for the master of middle-size and small-size cable-stayed bridge Tower, is limited by prestressed strand sweep not less than 4m, and " u "-shaped steel beam is often difficult to arrange, the scope of application is limited.

The content of the invention

For defect present in prior art, it is an object of the invention to provide a kind of king-tower containing prestressed strand With a kind of construction method containing prestressed strand king-tower, the stability of king-tower anchor-hold area stress can be effectively improved.

To achieve the above objectives, the present invention is adopted the technical scheme that:The top of king-tower is provided with anchor-hold area, and described At least a set of prestressed strand is provided with anchor-hold area, often cover prestressed strand include 4 strands be located at same vertical plane on and Every the J-shaped steel beam for setting, the two strands of J-shaped steel beams up and down often covered in prestressed strand are first group of steel beam, middle two strands of J words Shape steel beam is second group of steel beam, and two gangs of J-shaped steel Shu Jun in first group of steel beam and second group of steel beam are along bridge lateral side To being symmetrical arranged, and first group of steel beam and second group of steel interfascicular are symmetrical arranged along bridge longitudinal direction.

On the basis of above-mentioned technical proposal, the J-shaped steel beam includes line part and bending section, and the bending section Bending radius is more than or equal to 4m.

On the basis of above-mentioned technical proposal, the two ends of the J-shaped steel beam are respectively stretching end and anchored end, described Pull end is located at the line part of J-shaped steel beam.

On the basis of above-mentioned technical proposal, the J-shaped steel beam is steel strand wires.

The present invention also provides a kind of construction method containing prestressed strand king-tower, including:Using concreting bridge King-tower, and at least a set of prestressed strand is arranged in the anchor-hold area on king-tower top, often covering prestressed strand includes 4 bursts of positions Two strands of J-shaped steel beams up and down in prestressed strand on same vertical plane and spaced J-shaped steel beam, is often covered are first Group steel beam, middle two strands of J-shaped steel beams are second group of steel beam, and two strands in first group of steel beam and second group of steel beam are J-shaped Steel Shu Jun is symmetrical arranged along bridge lateral direction, and first group of steel beam and second group of steel interfascicular symmetrically set along bridge longitudinal direction Put.

On the basis of above-mentioned technical proposal, the J-shaped steel beam includes line part and bending section, and the bending section Bending radius is more than or equal to 4m.

On the basis of above-mentioned technical proposal, side wall of the bending section near king-tower.

On the basis of above-mentioned technical proposal, the two ends of the J-shaped steel beam are respectively stretching end and anchored end, described Pull end is located at the line part of J-shaped steel beam.

Compared with prior art, a kind of advantage of king-tower containing prestressed strand of the invention is:King-tower guy anchor Gu the J-shaped steel Shu Changdu in area is more long so that when prestressed stretch-draw is carried out, anchor deformation and steel beam bounce back J-shaped steel beam The loss of prestress relative value for causing is smaller;Using the structure of J-shaped bending, suspension cable is kept out using the radial load of bending section Huge horizontal component so that whole anchor-hold area is more uniformly stressed and more stablizes;Often set prestressed strand is only 4 Stock, during tensioning, the required anchorage number for using is few, reduces the work difficulty of workmen, improves efficiency of construction;J-shaped steel Beam is applied to various sizes of Cable stayed Bridge Main Tower, applied widely.

A kind of advantage of construction method containing prestressed strand king-tower of the invention is:In the anchor-hold of king-tower Area, the J-shaped steel beam being arranged circumferentially, the compressive pre-stress of generation ring, and J-shaped steel beam are intersected along bridge to setting by 4 strands, Tensioning direction with suspension cable is corresponding, so as to effectively keep out the huge horizontal component of suspension cable, it is ensured that king-tower anchor-hold area The safety of structure, combination property is good.

Brief description of the drawings

Fig. 1 is the structural representation of the prestressed strand of " well " font arrangement;

Fig. 2 is the structural representation of the prestressed strand of "U" shaped arrangement;

Fig. 3 is a kind of side view of the king-tower containing prestressed strand of the present invention;

Fig. 4 is first group of top view of steel beam;

Fig. 5 is second group of top view of steel beam;

Fig. 6 is a kind of top view of the king-tower containing prestressed strand of the present invention;

Fig. 7 is the structural representation of J-shaped steel beam.

In figure:1- prestressed strands, 2-J Zee bar steel Z beams, 3- suspension cables, 4- line parts, 5- bending sections.

Specific embodiment

The present invention is described in further detail below in conjunction with accompanying drawing.

The present invention provides a kind of king-tower containing prestressed strand, and the king-tower is applied to the king-tower of cable-stayed bridge, and king-tower is adopted Formed with concreting, the top of king-tower is provided with anchor-hold area, and anchor-hold area and is provided with least a set of prestress steel Beam, can flexibly be set according to the anchor-hold area size of different scales cable-stayed bridge, if anchorage zone sets many set prestressed strands, Then often set prestress steel interfascicular is set by the way of being superimposed up and down, typically sets a set of prestressing force in the anchor-hold area of king-tower Steel beam.Shown in Figure 3, often covering prestressed strand includes that 4 strands are located on same vertical plane and spaced J-shaped steel beam 2, Per share J-shaped steel beam 2 is set along along bridge to direction, and the direction with the tensioning of suspension cable on cable-stayed bridge 3 is corresponding.

Shown in Figure 4, the two strands of J-shaped steel beams up and down often covered in prestressed strand are first group of steel beam, referring to Fig. 5 institutes Show, middle two strands of J-shaped steel beams are second group of steel beam, two bursts of J-shaped steel Shu Jun edges in first group of steel beam and second group of steel beam Bridge lateral direction is symmetrical arranged, and first group of steel beam and second group of steel interfascicular are symmetrical arranged along bridge longitudinal direction, most end form Structure shown in Fig. 6.

For per share J-shaped steel beam, specific reference to shown in Fig. 7, the length of J-shaped steel beam is generally higher than 10m, J-shaped Steel beam includes line part 4 and bending section 5, and the bending radius of bending section 5 is more than or equal to 4m, and angle of bend is about 135 °, often Near the side wall of king-tower, the two ends of J-shaped steel beam are respectively stretching end and anchored end, tensioning for the bending section 5 of the J-shaped steel beam 2 of stock End is located at the line part 4 of J-shaped steel beam, J-shaped steel Shu Caiyong high intensity, the steel strand wires of underrelaxation.

Compared to the prestressed strand that " well " font is arranged, the prestressed strand structure of " well " font arrangement is answered in advance for many Power steel interfascicular is arranged in a mutually vertical manner, and J-shaped steel Shu Changdu of the invention is more long so that J-shaped steel beam is carrying out prestressed stretch-draw When, the loss of prestress relative value that anchor deformation and steel beam retraction cause is smaller, meanwhile, using the radial load of bending section 5, to support The huge horizontal component of gear suspension cable 3, the stress in the anchor-hold area for making more is stablized, and it is only 4 strands often to cover prestressed strand, During drawing, the required anchorage number for using is few, reduces the work difficulty of workmen, improves efficiency of construction.

Compared to the prestressed strand that " u "-shaped is arranged, the prestressed strand structure of " u "-shaped arrangement is two strands of U-shaped prestressing force Steel beam is symmetrical arranged, and J-shaped steel beam of the invention, the angle of bend of bending section 5 is smaller, when prestressed stretch-draw is carried out, in advance should The loss of power is relatively small, and the effective prestress of steel beam is relatively easy to control, and uses 4 strands of J-shaped steel beams along bridge to dispersed placement, makes Whole anchor-hold area stress it is more uniform, it is to avoid stress is excessively concentrated and king-tower is caused harm, while J-shaped steel Shu Shi It is applied widely for various sizes of Cable stayed Bridge Main Tower.

Therefore, the king-tower in the present invention, in anchor-hold area, the J-shaped steel beam being arranged circumferentially is intersected by 4 strands, is produced The compressive pre-stress of ring, and J-shaped steel beam along bridge to setting, the tensioning direction with suspension cable 3 is corresponding, so as to effectively keep out The huge horizontal component of suspension cable 3, it is ensured that the safety of anchor-hold plot structure, combination property is good.

The present invention also provides a kind of construction method containing prestressed strand king-tower based on above-mentioned king-tower structure, the method For:Using concreting bridge main tower, and at least a set of prestressed strand is arranged in the anchor-hold area on king-tower top, often Set prestressed strand includes that 4 strands are located on same vertical plane and spaced J-shaped steel beam 2, often in set prestressed strand Upper and lower two strands of J-shaped steel beams are first group of steel beam, and middle two strands of J-shaped steel beams are second group of steel beam, first group of steel beam and Two gangs of J-shaped steel Shu Jun in second group of steel beam are symmetrical arranged along bridge lateral direction, and first group of steel beam and second group of steel beam Between be symmetrical arranged along bridge longitudinal direction.

J-shaped steel beam includes line part 4 and bending section 5, and the bending radius of the bending section 5 is more than or equal to 4m, curved Near the side wall of king-tower, the two ends of J-shaped steel beam are respectively stretching end and anchored end to pars convoluta 5, and stretching end is located at J-shaped steel beam Line part 4.

The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from On the premise of the principle of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as protection of the invention Within the scope of.The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.

Claims (8)

1. a kind of king-tower containing prestressed strand, it is adaptable to the king-tower of cable-stayed bridge, it is characterised in that:The top of the king-tower sets Have and at least a set of prestressed strand is provided with anchor-hold area, and the anchor-hold area, often covering prestressed strand includes 4 bursts of positions In on same vertical plane and spaced J-shaped steel beam (2), the two strands of J-shaped steel beams up and down often covered in prestressed strand are First group of steel beam, middle two strands of J-shaped steel beams are second group of steel beam, two gangs of J in first group of steel beam and second group of steel beam Zee bar steel Z Shu Jun is symmetrical arranged along bridge lateral direction, and first group of steel beam and second group of steel interfascicular are symmetrical along bridge longitudinal direction Set.
2. a kind of king-tower containing prestressed strand as claimed in claim 1, it is characterised in that:The J-shaped steel beam includes Line part (4) and bending section (5), and the bending radius of the bending section (5) is more than or equal to 4m.
3. a kind of king-tower containing prestressed strand as claimed in claim 2, it is characterised in that:The two of the J-shaped steel beam End is respectively stretching end and anchored end, and the stretching end is located at the line part (4) of J-shaped steel beam.
4. a kind of king-tower containing prestressed strand as claimed in claim 1, it is characterised in that:The J-shaped steel beam is steel Twisted wire.
5. a kind of construction method containing prestressed strand king-tower, it is characterised in that the method is:Using concreting bridge King-tower, and at least a set of prestressed strand is arranged in the anchor-hold area on king-tower top, often covering prestressed strand includes 4 bursts of positions In on same vertical plane and spaced J-shaped steel beam (2), the two strands of J-shaped steel beams up and down often covered in prestressed strand are First group of steel beam, middle two strands of J-shaped steel beams are second group of steel beam, two gangs of J in first group of steel beam and second group of steel beam Zee bar steel Z Shu Jun is symmetrical arranged along bridge lateral direction, and first group of steel beam and second group of steel interfascicular are symmetrical along bridge longitudinal direction Set.
6. a kind of construction method containing prestressed strand king-tower as claimed in claim 5, it is characterised in that:It is described J-shaped Steel beam includes line part (4) and bending section (5), and the bending radius of the bending section (5) is more than or equal to 4m.
7. a kind of construction method containing prestressed strand king-tower as claimed in claim 6, it is characterised in that:The bending section (5) near the side wall of king-tower.
8. a kind of construction method containing prestressed strand king-tower as claimed in claim 6, it is characterised in that:It is described J-shaped The two ends of steel beam are respectively stretching end and anchored end, and the stretching end is located at the line part (4) of J-shaped steel beam.
CN201611086990.0A 2016-12-01 2016-12-01 Prestressed steel strands contained main tower and construction method thereof CN106702896A (en)

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Application Number Priority Date Filing Date Title
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0820910A (en) * 1994-07-05 1996-01-23 Kajima Corp Construction method of pc cable stayed bridge
CN104294747A (en) * 2014-09-23 2015-01-21 同济大学 Double-tower hybrid beam cable-stayed bridge system and construction method thereof
CN204252001U (en) * 2014-11-07 2015-04-08 中国市政工程东北设计研究总院有限公司 A kind of cable stayed bridge and Sarasota thereof
CN105926448A (en) * 2016-05-03 2016-09-07 中交第三航务工程局有限公司 Construction method for cable-stayed bridge main tower with curve single tower double cable planes
CN106012797A (en) * 2016-07-25 2016-10-12 同济大学 All-ground-anchor type single-tower double-span cable-stayed bridge structure and construction method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0820910A (en) * 1994-07-05 1996-01-23 Kajima Corp Construction method of pc cable stayed bridge
CN104294747A (en) * 2014-09-23 2015-01-21 同济大学 Double-tower hybrid beam cable-stayed bridge system and construction method thereof
CN204252001U (en) * 2014-11-07 2015-04-08 中国市政工程东北设计研究总院有限公司 A kind of cable stayed bridge and Sarasota thereof
CN105926448A (en) * 2016-05-03 2016-09-07 中交第三航务工程局有限公司 Construction method for cable-stayed bridge main tower with curve single tower double cable planes
CN106012797A (en) * 2016-07-25 2016-10-12 同济大学 All-ground-anchor type single-tower double-span cable-stayed bridge structure and construction method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
肖伟: ""国内外桥梁设计理念差异性对比"", 《江西建材》 *

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