CN107447991B - Construction method of prestressed arch center node in lower chord steel pipe - Google Patents
Construction method of prestressed arch center node in lower chord steel pipe Download PDFInfo
- Publication number
- CN107447991B CN107447991B CN201610374406.5A CN201610374406A CN107447991B CN 107447991 B CN107447991 B CN 107447991B CN 201610374406 A CN201610374406 A CN 201610374406A CN 107447991 B CN107447991 B CN 107447991B
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- pipe
- lower chord
- stiffening
- arch
- prestressed
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/32—Arched structures; Vaulted structures; Folded structures
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/32—Arched structures; Vaulted structures; Folded structures
- E04B2001/3229—Arched structures; Vaulted structures; Folded structures constructed using a boom
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
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Abstract
The invention relates to the field of steel structure construction, in particular to a construction method of a prestressed arch center node in a lower chord pipe; determining the positions and the number of cable turning points; determining the length of the guide pipe and the inner diameter of the inner stiffening pipe; determining the thickness of the stiffening pipe and the stiffening plate; bending the arch frame lower chord steel pipe in sections, inserting turning point nodes, and plug welding and fixing the turning point nodes and the arch frame lower chord steel pipe; completing hoisting and welding of the on-site arch centering; penetrating a bonded prestressed steel strand as a lead wire, and penetrating the unbonded prestressed steel strand into the lower chord tube of the arch frame through the lead wire; cutting off redundant steel strands according to tensioning and anchoring requirements; tensioning and anchoring in a grading manner by adopting a mode of tensioning at one end and complementing at the other end; and a protective cover is arranged at the end part of the anti-loosening clamping piece anchor, and anti-corrosion grease is filled in the protective cover. The construction method can save the building space, reduce the construction cost and simplify the stress condition of the truss structure.
Description
Technical Field
The invention relates to the field of steel structure construction, in particular to a construction method of a prestressed arch center node in a lower chord steel pipe.
Background
The prestressed arch structure can be divided into a guyed type and a displacement type, and a mixed mode of a double structure also exists. The displacement type is generally not provided with a stay cable, the load stress of the arch section is adjusted only by means of the horizontal displacement of the hinge point of the support, the process is simple, but the requirement on site conditions is high, so that the design position of the support is ensured. The guy cable of the guy cable type arch centering has the functions of mainly bearing the side thrust of the arch centering and adjusting the stress peak value of the section of the arch centering. The guy cables of the conventional prestressed arch are all arranged outside the arch structure, the guy cables are all linearly arranged, continuous guy cable arrangement or segmented guy cable arrangement can be adopted, the guy cables transmit force better during continuous guy cable arrangement but occupy larger building space, the segmented guy cable arrangement can save building space, but the guy cables are mutually influenced, the tensioning process is complex, and the force transmission effect is influenced to a certain extent.
Disclosure of Invention
The invention aims to provide a prestressed arch center node in a lower chord steel pipe, which can save building space, reduce construction cost and simplify stress conditions.
In order to achieve the above object, the present invention is realized by:
a construction method of a prestressed arch center node in a lower chord steel pipe comprises the following steps
Step 1, determining the positions and the number of cable turning points according to the span, the radius and the diameter of a lower chord steel pipe of an arch frame;
step 3, determining the thickness of the stiffening pipe and the stiffening plate according to the initial tension;
step 7, cutting off redundant steel strands according to tensioning and anchoring requirements;
step 8, performing graded tensioning and anchoring by adopting a mode of tensioning at one end and complementing at the other end;
and 9, mounting a protective cover at the end part of the anti-loosening clamping piece anchor, and filling the protective cover with anti-corrosion grease.
The construction method of the internal prestress arch center node of the lower chord steel pipe comprises the steps that the turning point node comprises an inner stiffening pipe, an outer stiffening pipe and two sections of guide pipes, the inner stiffening pipe is sleeved in the outer stiffening pipe, and the guide pipes are radially arranged at two ends of the inner stiffening pipe.
The construction method of the prestressed arch center node in the lower chord steel pipe further comprises an anchoring node used in the step 8, wherein the anchoring node comprises a guide pipe, a stiffening plate, an anti-loosening clamping piece anchor, an end plate and a protective cover which are arranged in a closing-up shape, the stiffening plate is sleeved outside the guide pipe and is connected with the lower chord steel pipe, and the end part of the unbonded prestressed steel strand is limited by the anti-loosening clamping piece anchor and the end plate after penetrating into the guide pipe.
Compared with the traditional prestressed arch center structure, the prestressed arch center structure has the advantages that:
(1) the cable distribution process of exposing the prestressed cable in the traditional prestressed arch truss structure is broken through, and the prestressed cable is distributed in the steel tube of the lower chord of the arch truss, so that the building space is saved.
(2) And the unbonded prestressed steel strand is used as a cable body material, so that the cost is reduced.
(3) A plurality of turning nodes are arranged in the arch center lower chord steel pipe, and the prestressed cables are continuously arranged, so that the force transmission effect is ensured, and the tensioning process is simplified.
Drawings
Fig. 1 is a schematic structural diagram of the node.
Fig. 2 is a schematic structural diagram of a turning point node.
Fig. 3 is a schematic structural diagram of an anchoring node.
Detailed Description
The invention is further illustrated by the following specific examples.
As shown in figures 1, 2 and 3, the construction method of the prestressed arch center node in the lower chord steel pipe comprises the following steps
Step 1, determining the position and the number of cable turning points 2 according to the span and the radius of an arch center 1 and the diameter of a lower chord steel pipe 12;
step 3, determining the thicknesses of the stiffening pipes 5 and the stiffening plates 6 according to the initial tensile force;
7, cutting off redundant steel strands 3 according to tensioning and anchoring requirements;
step 8, performing graded tensioning and anchoring by adopting a mode of tensioning at one end and complementing at the other end;
and 9, installing a protective cover at the end part of the anti-loosening clamping piece anchor 9 stretched at the end part of the arch center 1, and filling the protective cover with anti-corrosion grease.
In the construction method of the lower chord steel pipe internal prestress arch center node, the turning point node 7 comprises an inner stiffening pipe 5, an outer stiffening pipe 8 and two sections of guide pipes 4, wherein the inner stiffening pipe 5 is sleeved in the outer stiffening pipe 8, and the guide pipes 4 are radially arranged at two ends of the inner stiffening pipe 5.
The construction method of the prestressed arch center node in the lower chord steel pipe further comprises an anchoring node used in the step 8, wherein the anchoring node comprises a guide pipe 4, a stiffening plate 6, an anti-loosening clamping piece anchor 9, an end plate 10 and a protective cover 11 which are arranged in a closing-up shape, the stiffening plate 6 is sleeved outside the guide pipe 4 and is connected with the lower chord steel pipe, and the end part of the unbonded prestressed steel strand 3 is limited by the anti-loosening clamping piece anchor 9 and the end plate 10 after penetrating into the guide pipe 4.
Compared with the traditional prestressed arch center structure, the prestressed arch center structure has the advantages that:
(1) the cable distribution process of exposing the prestressed cable in the traditional prestressed arch truss structure is broken through, and the prestressed cable is distributed in the steel tube of the lower chord of the arch truss, so that the building space is saved.
(2) And the unbonded prestressed steel strand is used as a cable body material, so that the cost is reduced.
(3) A plurality of turning nodes are arranged in the arch center lower chord steel pipe, and the prestressed cables are continuously arranged, so that the force transmission effect is ensured, and the tensioning process is simplified.
Claims (1)
1. A construction method of a prestressed arch center node in a lower chord steel pipe is characterized by comprising the following steps: comprises that
Step 1, determining the positions and the number of cable turning point nodes according to the span, the radius and the diameter of a lower chord steel pipe of an arch frame;
step 2, determining the length of the guide pipe and the inner diameter of the inner stiffening pipe according to the number and the diameter of the steel strands;
step 3, determining the thicknesses of the inner stiffening pipe, the outer reinforced pipe and the stiffening plate according to the initial tension;
step 4, bending the arch center lower chord steel pipe in sections, inserting turning point nodes, and plug welding and fixing the turning point nodes and the arch center lower chord steel pipe;
step 5, completing field arch frame hoisting and welding;
step 6, firstly, penetrating a bonded prestressed steel strand into the arch center as a lead, and then penetrating the unbonded prestressed steel strand into a lower chord steel pipe of the arch center through the lead;
step 7, cutting off redundant steel strands according to tensioning and anchoring requirements;
step 8, performing graded tensioning and anchoring by adopting a mode of tensioning at one end and complementing at the other end;
step 9, mounting a protective cover at the end part of the anti-loosening clamping piece anchor, and filling anti-corrosion grease into the protective cover;
the turning point node comprises an inner stiffening pipe, an outer stiffening pipe and two sections of guide pipes, wherein the inner stiffening pipe is sleeved in the outer stiffening pipe, and the guide pipes are radially arranged at two ends of the inner stiffening pipe;
and furthermore, the steel wire rope anchoring device further comprises an anchoring node used in the step 8, wherein the anchoring node comprises a guide tube, a stiffening plate, an anti-loosening clamping piece anchor, an end plate and a protective cover, the guide tube is in a closed-up shape, the stiffening plate is sleeved outside the guide tube and is connected with the lower chord steel tube, and the end part of the non-bonding prestressed steel strand is limited by the anti-loosening clamping piece anchor and the end plate after penetrating into the guide tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610374406.5A CN107447991B (en) | 2016-05-31 | 2016-05-31 | Construction method of prestressed arch center node in lower chord steel pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610374406.5A CN107447991B (en) | 2016-05-31 | 2016-05-31 | Construction method of prestressed arch center node in lower chord steel pipe |
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| Publication Number | Publication Date |
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| CN107447991A CN107447991A (en) | 2017-12-08 |
| CN107447991B true CN107447991B (en) | 2020-02-28 |
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| CN201610374406.5A Active CN107447991B (en) | 2016-05-31 | 2016-05-31 | Construction method of prestressed arch center node in lower chord steel pipe |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108229001B (en) * | 2017-12-29 | 2020-12-25 | 自贡华西能源工业有限公司 | Method for applying prestress to tube bundle or tube panel of photo-thermal heat absorber |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01250543A (en) * | 1988-03-31 | 1989-10-05 | Shimizu Corp | Construction of tensed beam |
| CN1036426A (en) * | 1988-11-30 | 1989-10-18 | 谢锡范 | Bracing-cable arch |
| JPH0913504A (en) * | 1995-07-04 | 1997-01-14 | Ohbayashi Corp | Arrangement method for tendon of prestressed concrete arch |
| CN1405418A (en) * | 2002-07-23 | 2003-03-26 | 赵之娟 | Post-stretching prestressed concrete arch bar roof and its construction method |
| CN101798874A (en) * | 2010-03-08 | 2010-08-11 | 东南大学 | Pre-stress construction method of parallel steel stranded wire assembled cable in annular sealed steel pipe |
| CN102099536A (en) * | 2008-07-14 | 2011-06-15 | 阿贝欧股份有限公司 | Light-weight load-bearing structures reinforced by core elements made of segments and a method of casting such structures |
-
2016
- 2016-05-31 CN CN201610374406.5A patent/CN107447991B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01250543A (en) * | 1988-03-31 | 1989-10-05 | Shimizu Corp | Construction of tensed beam |
| CN1036426A (en) * | 1988-11-30 | 1989-10-18 | 谢锡范 | Bracing-cable arch |
| JPH0913504A (en) * | 1995-07-04 | 1997-01-14 | Ohbayashi Corp | Arrangement method for tendon of prestressed concrete arch |
| CN1405418A (en) * | 2002-07-23 | 2003-03-26 | 赵之娟 | Post-stretching prestressed concrete arch bar roof and its construction method |
| CN102099536A (en) * | 2008-07-14 | 2011-06-15 | 阿贝欧股份有限公司 | Light-weight load-bearing structures reinforced by core elements made of segments and a method of casting such structures |
| CN101798874A (en) * | 2010-03-08 | 2010-08-11 | 东南大学 | Pre-stress construction method of parallel steel stranded wire assembled cable in annular sealed steel pipe |
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| CN107447991A (en) | 2017-12-08 |
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