CN110904929A - Integral pre-buried installation method for whole U-shaped prestressed anchor cable - Google Patents
Integral pre-buried installation method for whole U-shaped prestressed anchor cable Download PDFInfo
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- CN110904929A CN110904929A CN201911209946.8A CN201911209946A CN110904929A CN 110904929 A CN110904929 A CN 110904929A CN 201911209946 A CN201911209946 A CN 201911209946A CN 110904929 A CN110904929 A CN 110904929A
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- corrugated pipe
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention belongs to a whole-bundle integral pre-buried installation method of a U-shaped prestressed anchor cable in the technical field of U-shaped anchor cable installation methods, and the technical scheme is as follows: the method comprises the following steps: penetrating an anchor cable into the corrugated pipe on the rope weaving platform to form a rope penetrating corrugated pipe; step two: the whole reeving corrugated pipe is embedded in a reinforcement cage of the gate pier concrete; step three: pouring gate pier concrete section by section from bottom to top, and accurately positioning and fixing the reeving corrugated pipe before pouring each section of gate pier concrete; besides the lowest section, the precise positioning and fixing of the reeving corrugated pipe at the upper section are carried out after the strength of the concrete at the lower section which is poured reaches more than 60 percent. The construction process is simple, the prestressed anchor cables are directly buried, all the prestressed anchor cables can be accurately in place, and the construction quality can be efficiently improved.
Description
Technical Field
The invention relates to a method for installing a U-shaped anchor cable, in particular to a method for integrally pre-burying and installing a whole prestressed anchor cable.
Background
The construction process of the domestic conventional U-shaped anchor cable comprises the following steps: after the anchor cable is manufactured, the anchor cable is coiled on a turntable and conveyed to a working platform which can be covered by vertical conveying equipment; the construction method that the anchor cable is slowly drawn by the low-speed winch and the traction rope pre-embedded in the protective pipe after the anchor cable is adjusted in order causes secondary rope weaving, the construction progress is slow, the protective pipe and the steel strand are easily damaged locally, the rope penetrating difficulty is caused in the past engineering practice, even the situation that the rope penetrating cannot be completed due to clamping is generated, and the situation that the designed tensioning tonnage cannot be reached is caused.
For example, in a certain hydropower station, 32U-shaped prestressed anchor cables are arranged in total in order to improve the stress state of the concrete of the gate pier near the anchor cable without weakening the structural integrity and at the same time, wherein the gate pier is provided with 3 holes multiplied by 9.5m, and the total installation length reaches 1680 m; phi 120 metal corrugated pipes are mainly used for pre-embedding holes, and the bending radius of an arc section is 2.2m to 3.0 m; the U-shaped anchor cable is formed into a bundle by adopting 21 strands of steel stranded wires with the strength grade of 1860MPa and the 7 phi 5, and the design tension of the anchor cable is 3550 kN; because the number of the steel strands of the U-shaped anchor cable cluster is large, the pore passage of the pre-buried corrugated pipe for installing the anchor cable is small, the installation and construction difficulty of the anchor cable is greatly increased due to the factors of small bending radius of the circular arc section of the corrugated pipe, tight construction period and the like, and therefore how to install and construct the U-shaped pre-stressed anchor cable quickly and efficiently becomes a key factor of construction progress.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for integrally pre-burying and installing the whole U-shaped prestressed anchor cables, which has simple construction process, directly buries the prestressed anchor cables, ensures that all the prestressed anchor cables can be accurately in place, and can efficiently improve the construction quality.
The technical scheme of the integral pre-buried installation method of the U-shaped prestressed anchor cable bundle is as follows.
The method comprises the following steps: penetrating an anchor cable into the corrugated pipe on the rope weaving platform to form a rope penetrating corrugated pipe;
step two: the method comprises the following steps that the reeving corrugated pipe is integrally embedded in a steel reinforcement cage of the gate pier concrete, and the reeving corrugated pipe is transported, hoisted, preliminarily positioned and fixed into a pre-designed U-shaped curve type;
step three: pouring gate pier concrete section by section from bottom to top, and accurately positioning and fixing the reeving corrugated pipe before pouring each section of gate pier concrete; besides the lowest section, the precise positioning and fixing of the reeving corrugated pipe at the upper section are carried out after the strength of the concrete at the lower section which is poured reaches more than 60 percent.
Based on the technical characteristics, in the second step, when the reeving corrugated pipe is transported, the distance between the temporary stress fulcrums of the reeving corrugated pipe is not more than 1.5m, and the bending radius of the reeving corrugated pipe is not less than 2.5 m.
Based on the technical characteristics, the temporary support is erected for positioning and fixing the reeving corrugated pipe, the temporary support is a well-shaped frame, the outer wall of the reeving corrugated pipe is clamped by the center of the well-shaped frame, and the extending section of the well-shaped frame is bound and fixed with the peripheral steel reinforcement cage or scaffold members.
Based on the technical characteristics, the track ribs are arranged outside the reeving corrugated pipe, the intersection parts of the well-shaped frame and the track ribs are bound and fixed with each other, and two ends of the track ribs are anchored in the lower-section concrete which is poured in advance respectively.
Based on the technical characteristics: setting up a temporary support to position and fix the reeving corrugated pipe, wherein the temporary support is a well-shaped frame, the center of the well-shaped frame clamps the outer wall of the reeving corrugated pipe and is vertically arranged, a track rib is arranged outside the reeving corrugated pipe, and two ends of the track rib are respectively anchored in the lower section of concrete which is poured in advance; and binding and fixing the intersection of the well-shaped frame and the rail rib.
The rail ribs are matched with the well-shaped frame for use, and further provide binding fixing points of the well-shaped frame or independently provide the binding fixing points of the well-shaped frame. Namely, the shaft-type frame can be bound and fixed with a reinforcement cage or a scaffold member or/and a rail rib.
Compared with the prior art, the whole-bundle integral pre-buried installation method of the U-shaped prestressed anchor cable has the following advantages:
firstly, a U-shaped anchor cable penetrates into the corrugated pipe on a braiding working platform, and the braided corrugated pipe is integrally transported and hoisted to a working surface to complete primary positioning and fixing. The reeving corrugated pipe is accurately positioned and fixed section by section from bottom to top according to the pouring stage of concrete, and meanwhile, the reeving corrugated pipe can adopt support measures such as rail ribs, well-shaped frames and the like to ensure that the positioning of the reeving corrugated pipe meets the design requirements and prevent a cable body from sliding, moving and displacing. The invention has simple process flow and convenient operation, greatly reduces the mutual damage caused by mutual extrusion and friction of the anchor cable and the corrugated pipe in the cable penetrating process, greatly improves the cable penetrating speed, and more effectively improves the construction quality. The beneficial effects are that:
1. and the rear rope threading is not needed, so that the failure rate of rope threading in the middle and later periods in the prior art is avoided.
2. By adopting the integral pre-buried installation method, the diameter of the corrugated pipe can be reduced to the maximum extent, and the weakening of the gate pier structure is reduced.
3. The anchor cable can be tightly attached to the gate pier concrete at the initial tensioning stage, and the anchor cable prestress loss caused by the tiny deformation of later-stage corrugated pipes due to the adoption of pre-embedded corrugated pipes and post reeving is reduced.
Drawings
FIG. 1 is a first process diagram of the integral pre-buried installation method of the U-shaped prestressed anchor cable bundle of the present invention.
FIG. 2 is a second process diagram of the integral pre-buried installation method of the U-shaped pre-stressed anchor cable bundle of the present invention.
Fig. 3 is a schematic diagram of a derrick.
Fig. 4 is a schematic view of a rail rib.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The concrete implementation of the method for integrally pre-burying and installing the whole bundle of U-shaped prestressed anchor cables in the engineering is further explained below.
The method comprises the following steps: and penetrating an anchor cable into the corrugated pipe on the braiding platform to form a cable-threading corrugated pipe.
Penetrating an anchor cable into the corrugated pipe on the cable weaving platform; before cable threading, carefully checking whether the corrugated pipe pore passage is smooth, if impurities exist in the pore passage, flushing the corrugated pipe pore passage by using high-pressure water, and driving residual water out of the pore passage by using high-pressure air; the connecting pipe of the anchor cable metal corrugated pipe is preferably connected by a metal corrugated pipe with the pipe diameter being one larger than that of the metal corrugated pipe, the length can be 200mm to 300mm, and the two ends of the connecting pipe are wrapped by waterproof latex tapes or other materials.
Step two: as shown in fig. 1, the reeving corrugated pipe 1 is integrally embedded in a reinforcement cage 2 of the gate pier concrete, and comprises the steps of conveying, hoisting, primarily positioning and fixing the reeving corrugated pipe into a pre-designed U-shaped curve type.
When the reeving corrugated pipe is transported, the whole bottom of the reeving corrugated pipe is preferably lifted, only the reeving corrugated pipe is strictly pulled, the distance between stress fulcrums of the reeving corrugated pipe in the transportation process is not larger than 1.5m, and the bending radius of the reeving corrugated pipe is not smaller than 2.5m, so that the anchor cable and the corrugated pipe are prevented from being damaged. The reeving corrugated pipe is carefully operated during carrying, loading and unloading, and is prevented from being rubbed with hard objects, so that the outer PE protective layer and the corrugated pipe wall of the anchor cable are prevented from being damaged.
Construction scaffold is set up to reeving bellows installation forward position steel reinforcement cage both sides to fix when the installation location, preferably adopt the portal crane to hoist, and rationally set up the hoisting point, manual work cooperation fixes a position. The reasonable standard is to enable the reeving corrugated pipe to be integrally hung, so that the corrugated pipe and an anchor cable inside the corrugated pipe are synchronously stressed, the anchor cable is relatively heavy, the corrugated pipe is light and fragile, and the reeving corrugated pipe is prevented from being torn, and the reeving corrugated pipe is required to be uniformly stressed as many as possible as hanging points.
Step three: as shown in fig. 2, pouring the gate pier concrete section by section from bottom to top, and accurately positioning and fixing the reeving corrugated pipe before pouring each section of the gate pier concrete; besides the lowest section, the precise positioning and fixing of the reeving corrugated pipe at the upper section are carried out after the strength of the concrete at the lower section which is poured reaches more than 60 percent.
The method is characterized in that a U-shaped prestressed anchor cable is adopted, a reeving corrugated pipe which penetrates into an anchor cable in advance has a larger inclination, so that the reeving corrugated pipe needs to be positioned and fixed section by section from bottom to top, the height difference from the lowest point to the highest point of the reeving corrugated pipe is large, after the reeving corrugated pipe is initially positioned, the reeving corrugated pipe cannot be poured into the gate pier concrete at all at one time, when the lower section of concrete is poured, the upper section of the reeving corrugated pipe cannot be accurately positioned in place at one time, a temporary support can be erected to support the reeving corrugated pipe at the upper section, the position and the type of the temporary support can be continuously changed according to the concrete pouring progress of each section, but when the reeving corrugated pipe is accurately positioned and fixed, the strength of the concrete poured at the lower section can be ensured to be more than 60%.
If a plurality of reeving corrugated pipes are embedded simultaneously, the two ends of each reeving corrugated pipe are suitable to be marked, and the two ends of the same reeving corrugated pipe are ensured to be the same mark, so that drawing errors cannot occur during later single pre-tightening.
The installation of the reeving corrugated pipe is correct, smooth, firm and reliable. The reeving corrugated pipe can adopt temporary support measures such as rail ribs, a well-shaped frame and the like to prevent the reeving corrugated pipe from sliding, moving and displacing. The temporary support can be applied to preliminary positioning and fixing, accurate positioning and fixing.
As shown in fig. 3, the center of the shaft-type frame 3 is clamped on the outer wall of the reeving corrugated pipe 1, and the overhanging section of the shaft-type frame 3 is bound and fixed with the intersecting steel bars 5 of the peripheral steel reinforcement cage or scaffold members. As shown in fig. 4, a track rib 4 is arranged outside the reeving corrugated pipe, the intersection of the well-shaped frame 3 and the track rib 4 is bound and fixed, and two ends of the track rib 4 are respectively anchored in the lower-section concrete which is poured in advance. The reinforcing bars constituting the shaft frame 3 may be bound to each other at the intersections.
Before each section of concrete is poured, the sealing performance and the like of the accurately positioned and installed reeving corrugated pipe are comprehensively checked, and the orifices at two ends are temporarily blocked and protected. In the concrete pouring process, a specially-assigned person should take care of the concrete, prevent impact, touch injury or move the pore canal pipe, and prevent the perforated corrugated pipe from being blocked.
The cable-penetrating corrugated pipe which is preliminarily positioned and fixed but not poured into concrete is covered and wrapped by plastic cloth, so that the cable and the corrugated pipe are protected from sun, rain and dirt, and the like, and particularly, the pipe opening and the exposed steel strand are sealed by adopting strict protection measures.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (5)
1. A whole-bundle integral pre-buried installation method for U-shaped prestressed anchor cables is characterized by comprising the following steps:
the method comprises the following steps: penetrating an anchor cable into the corrugated pipe on the rope weaving platform to form a rope penetrating corrugated pipe;
step two: the whole reeving corrugated pipe is embedded in a reinforcement cage of the gate pier concrete, and the reeving corrugated pipe is transported, hoisted, preliminarily positioned and fixed into a pre-designed U-shaped curve type;
step three: pouring the gate pier concrete section by section from bottom to top, and accurately positioning and fixing the reeving corrugated pipe before pouring each section of the gate pier concrete; and besides the lowest section, the precise positioning and fixing of the reeving corrugated pipe at the upper section are carried out after the strength of the concrete at the lower section which is poured reaches more than 60 percent.
2. The integral pre-buried installation method of the U-shaped prestressed anchor cable bundle as claimed in claim 1, wherein: in the second step, when the reeving corrugated pipe is transported, the distance between each temporary stress fulcrum of the reeving corrugated pipe is not more than 1.5m, and the bending radius of the reeving corrugated pipe is not less than 2.5 m.
3. The integral pre-buried installation method of the U-shaped prestressed anchor cable bundle as claimed in claim 1, wherein: the temporary support is a well-shaped frame, the center of the well-shaped frame clamps the outer wall of the reeving corrugated pipe and is vertically arranged, and the extending section of the well-shaped frame is bound and fixed with the intersection of the reinforcing cage or the component of the built scaffold.
4. The integral pre-buried installation method of the U-shaped prestressed anchor cable bundle as claimed in claim 3, wherein: and track ribs are arranged outside the cable-penetrating corrugated pipe, the intersection parts of the well-shaped frame and the track ribs are bound and fixed, and two ends of the track ribs are respectively anchored in the lower-section concrete which is poured in advance.
5. The integral pre-buried installation method of the U-shaped prestressed anchor cable bundle as claimed in claim 1, wherein: setting up a temporary support to position and fix the reeving corrugated pipe, wherein the temporary support is a well-shaped frame, the center of the well-shaped frame clamps the outer wall of the reeving corrugated pipe and is vertically arranged, a track rib is arranged outside the reeving corrugated pipe, and two ends of the track rib are respectively anchored in the lower section of concrete which is poured in advance; and binding and fixing the intersection of the well-shaped frame and the rail rib.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911209946.8A CN110904929A (en) | 2019-11-29 | 2019-11-29 | Integral pre-buried installation method for whole U-shaped prestressed anchor cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911209946.8A CN110904929A (en) | 2019-11-29 | 2019-11-29 | Integral pre-buried installation method for whole U-shaped prestressed anchor cable |
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| CN110904929A true CN110904929A (en) | 2020-03-24 |
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| CN201911209946.8A Pending CN110904929A (en) | 2019-11-29 | 2019-11-29 | Integral pre-buried installation method for whole U-shaped prestressed anchor cable |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410125A (en) * | 2013-08-22 | 2013-11-27 | 中国水利水电第八工程局有限公司 | Integral U-shaped anchor rope embedded duct and mounting method thereof |
| CN104121423A (en) * | 2014-07-16 | 2014-10-29 | 中国水利水电第七工程局成都水电建设工程有限公司 | U-shaped pipe diameter limit clamp and construction method of U-shaped pipe diameter limit clamp in pore way embedment |
| CN107476263A (en) * | 2017-09-29 | 2017-12-15 | 中国水利水电第八工程局有限公司 | A kind of construction method of prestressed pier anchor cable |
| KR102023086B1 (en) * | 2018-07-06 | 2019-09-20 | 김수철 | End compression and tension type permanent anchor |
-
2019
- 2019-11-29 CN CN201911209946.8A patent/CN110904929A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410125A (en) * | 2013-08-22 | 2013-11-27 | 中国水利水电第八工程局有限公司 | Integral U-shaped anchor rope embedded duct and mounting method thereof |
| CN104121423A (en) * | 2014-07-16 | 2014-10-29 | 中国水利水电第七工程局成都水电建设工程有限公司 | U-shaped pipe diameter limit clamp and construction method of U-shaped pipe diameter limit clamp in pore way embedment |
| CN107476263A (en) * | 2017-09-29 | 2017-12-15 | 中国水利水电第八工程局有限公司 | A kind of construction method of prestressed pier anchor cable |
| KR102023086B1 (en) * | 2018-07-06 | 2019-09-20 | 김수철 | End compression and tension type permanent anchor |
Non-Patent Citations (4)
| Title |
|---|
| 北京城建集团: "《路桥、市政工程施工工艺标准》", 31 July 2004, 中国计划出版社 * |
| 童文威: "大连市香炉礁立交桥预应力段施工", 《城市道桥与防洪》 * |
| 谢泽良: "铜街子水电站溢流坝闸墩预应力锚索施工", 《四川水力发电》 * |
| 黄亚雄: "安哥拉公司项目群施工新技术应用", 《红水河》 * |
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