CN111155822A - Steel strand installation method for wind driven generator support tower frame prestressed structure - Google Patents
Steel strand installation method for wind driven generator support tower frame prestressed structure Download PDFInfo
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- CN111155822A CN111155822A CN201811383914.5A CN201811383914A CN111155822A CN 111155822 A CN111155822 A CN 111155822A CN 201811383914 A CN201811383914 A CN 201811383914A CN 111155822 A CN111155822 A CN 111155822A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/16—Prestressed 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
- 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
- E04G21/121—Construction of stressing jacks
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Abstract
The invention provides a steel strand installation method for a wind driven generator support tower frame prestressed structure, which comprises the following steps: installing a tower top anchorage device and a tower bottom anchorage device; a winch is used for drawing the single steel strand into a target tower bottom anchor hole, and a tower bottom clamping piece is used for anchoring; indexing the steel strand into a target tower top anchor hole, and anchoring the steel strand by using a tower top clamping piece; changing the target tower top anchor holes and the target tower bottom anchor holes until the first preset number of target tower top anchor holes and the target tower bottom anchor holes are hoisted and anchored; and transforming the tower top anchorage devices and the tower bottom anchorage devices until the suspension and the anchoring of the tower top anchorage devices and the tower bottom anchorage devices of a second preset number are completed. The invention adopts the modes of single hanging, tensioning and diagonal installation to install the steel strands, has high installation efficiency, large safety factor, low energy consumption and stable installation, solves the problems of mutual twisting, winding and interference between the installed steel strands, reduces the height of the basic inner cavity of the tower, and saves the material, construction and labor cost.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a steel strand installation method for a wind driven generator support tower frame prestressed structure.
Background
In the prior art, when the steel strands of the wind driven generator support tower are installed, a large crane or a high-power winch, a large-range jack and other equipment are generally utilized, and the whole bundle of steel strands is heavy, and the whole bundle of steel strands approximately comprises dozens of or even dozens of steel strands, so that the weight of the whole bundle of steel strands is often several tons, the operation efficiency is low, the energy consumption cost is high, the risk coefficient is high, the installed steel strands are easy to stir, the steel strands are easy to loosen, and the tensioning effect is influenced.
Disclosure of Invention
The invention aims to provide a steel strand installation method for a wind driven generator support tower frame prestress structure, which adopts a method of single steel strand hanging and diagonal installation, and solves the problems of low processing efficiency, large danger coefficient, high energy consumption and easiness in twisting, winding and interference of the installed steel strand in the steel strand hoisting operation process.
The invention provides a steel strand installation method for a wind driven generator support tower frame prestressed structure, which comprises the following steps:
s11, respectively installing a tower top anchorage device and a tower bottom anchorage device to the tower top and the tower bottom, and coaxially arranging a target tower top anchor hole on the tower top anchorage device and a target tower bottom anchor hole on the tower bottom anchorage device;
s21, pulling a single steel strand into the target tower bottom anchor hole by using a winch, anchoring the steel strand in the target tower bottom anchor hole by using a tower bottom clamping piece, pulling the steel strand into the target tower top anchor hole corresponding to the target tower bottom anchor hole by using the winch, and anchoring the steel strand in the target tower top anchor hole by using the tower top clamping piece;
tensioning the single steel strand by using the jack;
pulling the other steel strand into a diagonal tower bottom anchor hole by using the winch, anchoring the steel strand in the diagonal tower bottom anchor hole, pulling the steel strand into a diagonal tower top anchor hole corresponding to the diagonal tower bottom anchor hole by using the winch, and anchoring the steel strand in the diagonal tower top anchor hole;
tensioning the steel strand by using a jack;
the diagonal tower top anchor holes and the target tower top anchor holes are distributed at an angle of 180 degrees, and the diagonal anchor bottom anchor holes and the target anchor bottom anchor holes are distributed at an angle of 180 degrees;
s31, changing the target tower bottom anchor holes and the corresponding target tower top anchor holes, and repeatedly executing the step S21 until the steel strands in the first preset number of target tower bottom anchor holes and the target tower top anchor holes are all hung, anchored and tensioned;
s41, transforming the tower bottom anchorage devices and the corresponding tower top anchorage devices, and repeatedly executing the steps S21 and S31 until the steel strands in the tower bottom anchorage devices and the corresponding tower top anchorage devices in a second preset number are all hung, anchored and tensioned.
Preferably, before the tower top anchor and the tower bottom anchor are respectively installed to the tower top and the tower bottom and the target tower top anchor hole on the tower top anchor and the target tower bottom anchor hole on the tower bottom anchor are coaxially arranged, the method further comprises:
and marking all the target tower bottom anchor holes, all the corresponding target tower top anchor holes, all the diagonal tower bottom anchor holes and all the corresponding diagonal tower top anchor holes.
Preferably, before labeling all of the target tower bottom anchor holes, all of the corresponding target tower top anchor holes, all of the diagonal tower bottom anchor holes, and all of the corresponding diagonal tower top anchor holes, the method further includes:
erecting a reaction frame on the tower top;
arranging the winch, the pulley and the guide wheel on the ground;
respectively installing a tower top tower drum and a tower bottom tower drum at the tower top and the tower bottom;
and installing a plurality of tower top anchors and a plurality of tower bottom anchors on the tower top tower barrel and the tower bottom tower barrel respectively.
Preferably, the pay-off reel is hoisted to the position near the door opening;
erecting a pay-off rack;
paving a colored adhesive tape along the paving path of the steel strand, measuring the length of the steel strand, and marking a first mark at the tail end of the colored adhesive tape;
measuring the blanking cutting-off position and marking a second label;
drawing the steel strand from the steel winch to the first index position;
and cutting the steel strand at the second mark position.
Preferably, utilize the jack to be single the steel strand wires stretch-draw, and utilize the jack to be right after the steel strand wires stretch-draw, still include:
measuring the tension force of the steel strand by using a single-hole jack and a tension oil pump;
tensioning the steel strand with insufficient tensioning force by using tensioning equipment, and loosening the steel strand by loosening the nut of the tower bottom anchorage device.
Preferably, utilize tensioning equipment to the not enough steel strand wires of tensioning force, through the unscrewing the nut of tower bottom ground tackle is to the steel strand wires transfer after loose, still include:
and shock absorbers are respectively arranged in the tower bottom anchorage device, the tower top anchorage device and between the tower bottom anchorage device and the tower top anchorage device.
Preferably, the shock absorbers are respectively installed inside the tower bottom anchorage device, inside the tower top anchorage device and between the tower bottom anchorage device and the tower top anchorage device, and the shock absorbers are specifically as follows:
respectively installing positioners at the anchoring end of the tower top anchorage device and the tensioning end of the tower bottom anchorage device;
and a restraint ring is arranged on the steel strand between the tensioning end and the anchoring end.
Preferably, after the restraint ring is installed on the steel strand between the tensioning end and the anchoring end, the method further includes:
cutting the steel strand;
and filling lubricating grease into a gap between the extension pipe inside the tower top anchorage device and the steel strand and a gap between the extension pipe inside the tower bottom anchorage device and the steel strand, and smearing the lubricating grease on the steel strand which leaks outwards.
Preferably, after the lubricating grease is poured into the gap between the extension pipe inside the tower top anchorage device and the stranded wire and the gap between the extension pipe inside the tower bottom anchorage device and the steel stranded wire, and the lubricating grease is applied to the steel stranded wire which leaks outwards, the method further comprises the following steps:
and a locking nut is arranged on the steel strand at the tensioning end.
Compared with the prior art, the invention provides a steel strand installation method for a wind driven generator support tower frame prestressed structure, which comprises the steps of firstly, installing a tower top anchorage device and a tower bottom anchorage device, coaxially arranging the tower top anchorage device and the tower bottom anchorage device, and ensuring that each target tower top anchor hole on the tower top anchorage device and each target tower bottom anchor hole on the tower bottom anchorage device are in one-to-one correspondence and coaxially arranged, so that a single steel strand after installation can be in a vertical installation state; then, a winch is used for dragging the single steel strand into a target tower bottom anchor hole, and a tower bottom clamping piece is used for anchoring the steel strand in the target tower bottom anchor hole; the steel strand is pulled to a corresponding target tower top anchor hole through a winch, and the steel strand in the target tower top anchor hole is anchored by using a tower top clamping piece; tensioning the single steel strand by using a jack; thirdly, changing a target tower bottom anchor hole and a corresponding target tower top anchor hole, and repeatedly executing the rope threading step, namely pulling another steel strand to a diagonal tower bottom anchor hole arranged diagonally to the target tower bottom anchor hole by using a winch, and anchoring by using a tower bottom clamping piece; drawing the same steel strand into a diagonal tower top anchor hole diagonally arranged with the target tower top anchor hole, and anchoring by using the tower top clamping piece until a first preset number of steel strands are completely penetrated into the target tower top anchor hole and the target tower bottom anchor hole; and finally, transforming the tower top anchorage devices and the corresponding tower bottom anchorage devices, and repeatedly executing the rope penetrating steps until a second preset number of steel strands are completely penetrated in the tower top anchorage devices and the corresponding tower bottom anchorage devices. Compared with the construction method for mounting the whole steel strand bundle in the prior art, the steel strand mounting method for the wind driven generator support tower frame prestressed structure provided by the invention has the following advantages:
compared with the whole bundle hoisting of the steel strands, the vertical installation of the steel strands can be ensured by penetrating the single steel strand into the target tower top anchor hole and the corresponding target tower bottom anchor hole, so that the inclination, torsion and winding of the steel strands caused by the whole bundle installation of the steel strands in the prior art can be avoided, and the tension and tension force compliance of the steel strands is ensured;
the method for single hoisting and single tensioning remarkably reduces the height of the foundation cavity of the tower cylinder, remarkably reduces the consumption of the foundation reinforced concrete, simultaneously remarkably reduces the power consumption of hoisting equipment such as a winch and the like and tensioning equipment such as a jack and the like, does not need the intervention of a large crane, remarkably reduces the production cost, and simultaneously remarkably improves the cable penetrating efficiency, realizes the streamlined cable penetrating operation and realizes the safe operation in the cable penetrating process;
the synchronous rope penetrating method is adopted, namely, when the steel strand is penetrated through one target tower bottom anchor hole and one corresponding target tower top anchor hole, the steel strand is penetrated through the diagonal tower bottom anchor hole and the diagonal tower top anchor hole which are diagonally arranged with the target tower bottom anchor hole, so that the uniform stress of the anchorage device can be ensured, and the balance of the hoisting process is ensured.
According to the steel strand installation method for the wind driven generator support tower frame prestressed structure, which is provided by the invention, the method of single steel strand hanging, tensioning and diagonal installation is adopted, the installation efficiency of the steel strands is improved, the energy consumption of equipment is reduced, the height of the basic inner cavity of the tower barrel is reduced, the problems of mutual twisting, winding and interference among the steel strands and unbalanced stress are solved, and the safe rope penetrating is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flow chart of a steel strand installation method for a wind turbine support tower prestressed structure provided by the invention.
Detailed Description
The core of the invention is to provide a steel strand installation method for a wind driven generator support tower frame prestress structure, and the method of single steel strand hanging and diagonal installation is adopted, so that the problems of low processing efficiency, large danger coefficient, high energy consumption and easiness in twisting and winding of the installed steel strand in steel strand hoisting operation are solved.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for installing a steel strand for a prestressed structure of a wind turbine tower according to the present invention.
The invention provides a steel strand installation method for a wind driven generator support tower frame prestressed structure, which comprises the step S11 of installing a tower top anchorage device and a tower bottom anchorage device to a tower top and a tower bottom respectively, and coaxially arranging a target tower top anchorage hole on the tower top anchorage device and a target tower bottom anchorage hole on the tower bottom anchorage device.
In the step S11, the top anchorage device and the bottom anchorage device are respectively hoisted into the top tower drum and the bottom tower drum by using a truck crane or a crawler crane, and the tensioning oil pump and the jack are hoisted into the top tower drum and the bottom tower drum for later tensioning; when the tower top anchorage device is installed, the tower top anchorage device is hoisted to a corresponding construction position on a tower by using a crawler crane, the tower top anchorage device is hoisted to an installation position by using a crane, the tower top anchorage device needs to be checked before installation, whether the model is correct or not and whether the outside of the tower top anchorage device is damaged or not are determined, and the like; when the tower bottom anchorage device is installed, a steel strand downwards penetrates out of the bottom embedded pipe to fasten the tower bottom anchorage device, the tower bottom anchorage device is anchored by a tower bottom clamping piece, the other end of the tower bottom anchorage device is connected with a single-hole anchor welded with a hanging ring, the single-hole anchor is hung on the upper opening of an anchoring plate by a chain block, the chain block is tightened, a guide pipe of the tower bottom anchorage device is inserted into a cable guide pipe, and the installation of the tower bottom anchorage device is completed. In order to realize the measurement of the cable force, when the tower bottom anchorage device is installed, an anchor cable meter needs to be installed on the tower bottom anchorage device, so that the measurement of the cable force of the steel strand is convenient to follow.
In addition, when the tower top anchorage device and the tower bottom anchorage device are installed, the coaxial arrangement of the tower top anchorage device and the tower bottom anchorage device is ensured, and each tower top anchor hole on the tower top anchorage device and each tower bottom anchor hole on the tower bottom anchorage device are ensured to be in one-to-one correspondence and coaxial arrangement, namely, each tower top anchor hole is correspondingly arranged right above each tower top anchor hole respectively, so that under the constraint of each anchor hole, the steel strand after installation can be ensured to be in a vertical installation state, and each steel strand is arranged in parallel, and thus, the mutual interference between the steel strands can be prevented.
After the installation of the tower top anchorage and the tower bottom anchorage of the step S11 is performed, the step S21 is performed: the method comprises the following steps of (1) dragging a single steel strand into a target tower bottom anchor hole by using a winch, anchoring the steel strand in the target tower bottom anchor hole by using a tower bottom clamping piece, dragging the steel strand into a target tower top anchor hole corresponding to the target tower bottom anchor hole by using the winch, and anchoring the steel strand in the target tower top anchor hole by using a tower top clamping piece;
tensioning the single steel strand by using a jack;
the other steel strand is pulled into a diagonal tower bottom anchor hole by a winch, the steel strand in the diagonal tower bottom anchor hole is anchored, the steel strand is pulled into a diagonal tower top anchor hole corresponding to the diagonal tower bottom anchor hole by the winch, and the steel strand in the diagonal tower top anchor hole is anchored;
tensioning the steel strand by using a jack;
wherein, the diagonal tower top anchor hole and the target tower top anchor hole are distributed at an angle of 180 degrees, and the diagonal anchor bottom anchor hole and the target anchor bottom anchor hole are distributed at an angle of 180 degrees.
In the step S21, the steel cable of the hoist is placed around the bottom door opening from the corresponding anchor hole of the anchor on the tower through the tackle, and the steel cable is ensured to pass through the restraint ring before being placed; then, peeling off PE skin at the end part of the steel strand positioned at the tower top according to the expected length, opening seven steel strands with the skin peeled off, and cutting off six steel strands at the periphery according to the specification; secondly, upsetting the central filament, and installing a bullet head and a connector; thirdly, connecting the steel strand with the head of the steel strand with the steel wire rope placed at the top of the tower; and finally, starting a winch, slowly pulling the steel strand to a target tower bottom anchor hole of the tower bottom anchor, clamping the steel strand in the tower bottom anchor hole by using a tower bottom clamping piece, pulling the steel strand to a target tower top anchor hole positioned right above the target tower bottom anchor hole by using the winch, anchoring the steel strand by using a tower top clamping piece, tensioning the single steel strand which is completely penetrated by the tower top clamping piece by using a jack, and thus, completing the hanging of the single steel strand in one target tower top anchor hole and one target tower bottom anchor hole.
And then, pulling another steel strand into a diagonal tower bottom anchor hole diagonally arranged with the target tower bottom anchor hole by using the winch again, anchoring the steel strands in the diagonal tower bottom anchor hole by using the tower bottom clamping piece, pulling the same steel strand into a diagonal tower top anchor hole arranged right above the diagonal tower bottom anchor hole, anchoring the steel strands in the diagonal tower top anchor hole by using the tower top clamping piece, and tensioning the steel strands by using a jack, so that the hanging of the single steel strand in the diagonal tower bottom anchor hole and the single steel strand in the diagonal tower top anchor hole is completed.
It should be noted that, the installation of the steel strand of the target tower bottom anchor hole and the target tower top anchor hole may be performed first, and then the installation of the diagonal tower bottom anchor hole and the diagonal tower top anchor hole may be performed, and certainly, the simultaneous hanging of the steel strand in the target tower bottom anchor hole and the diagonal tower bottom anchor hole, and the target tower top anchor hole and the diagonal tower top anchor hole may be performed, so as to improve the installation efficiency.
And after the installation of the steel strand arranged at the opposite angle is finished, executing the step S31, converting the target tower bottom anchor holes and the corresponding target tower top anchor holes, and repeatedly executing the step S21 until the steel strands in the first preset number of target tower top anchor holes and the target tower bottom anchor holes are completely hung and anchored.
In step S31, the target tower bottom anchor hole and the corresponding target tower top anchor hole are changed, a steel strand is threaded into the next target tower bottom anchor hole and the next target tower top anchor hole by using equipment such as a winch, and after the threading of the other target tower bottom anchor hole and the target tower top anchor hole is completed, the threading of the diagonal tower bottom anchor hole arranged diagonally to the target tower bottom anchor hole and the diagonal tower top anchor hole arranged diagonally to the target tower top anchor hole is performed until the first preset number of tower bottom anchor holes and tower top anchor holes are all threaded.
And (5) executing the step (S41), transforming the tower bottom anchors and the corresponding tower top anchors, and repeatedly executing the steps (S21) and (S31) until the second preset number of tower bottom anchors and the corresponding tower top anchors are hung and anchored.
That is, after the first preset number of tower bottom anchor holes and the corresponding tower top anchor holes are completely penetrated, the tower top anchorage device and the tower bottom anchorage device are transformed, the step S21 is repeated, the cable is penetrated and anchored to each tower bottom anchor hole on the transformed tower bottom anchorage device, and the cable is penetrated and anchored to each tower top anchor hole on the transformed tower top anchorage device, until the second preset number of tower bottom anchorage devices and the tower top anchorage devices are completely clamped.
According to the construction method for synchronously installing the single hoisting, tensioning and diagonal angles, the steel strands can be prevented from being penetrated wrongly under the constraint of the tower top anchor hole and the tower bottom anchor hole, so that the steel strands can be prevented from inclining, twisting and winding, the tension force compliance of the steel strands is ensured, and more importantly, the single hoisting and tensioning method remarkably reduces the power consumption of a winch and a jack, reduces the height of a basic inner cavity of a tower barrel and saves the production cost. In addition, the method for diagonally installing the steel strand can ensure the balance of the tower top anchorage and the tower bottom anchorage in the cable penetrating process, and obviously improves the installation efficiency of the steel strand.
In this application the term "steel strand" is used to denote a sheathed strand, or simply a strand, but of course also cables, wires and hoses. As a possible component of the steel strand, the steel strand may be used for transmitting any type of signal or energy or liquid. In addition, the first preset number and the second preset number may be equal to or different from each other, and the specific number thereof should be set according to actual needs, and the present disclosure is not limited herein.
And step S11, before the tower top anchor and the tower bottom anchor are coaxially installed to the tower top and the tower bottom, respectively, and the target tower top anchor hole on the tower top anchor and the target tower bottom anchor hole on the tower bottom anchor are coaxially installed, marking all target tower bottom anchor holes, all corresponding target tower top anchor holes, all corresponding diagonal tower bottom anchor holes, and all corresponding diagonal tower top anchor holes.
That is, before the tower top anchorage and the tower bottom anchorage are installed, of course, after the tower top anchorage and the tower bottom anchorage are installed, the physical structures near the target tower top anchor hole, the target tower bottom anchor hole, the diagonal tower top anchor hole and the diagonal tower bottom anchor hole are marked with the same marks for the convenience of quick identification, for example, the reference numbers 1, 2, and 3 … … are marked on each target tower top anchor hole, then the reference numbers 1, 2, and 3 … … are marked on each target tower bottom anchor hole, and as such, before, during and after reeving, the worker identifies the labels at the anchor holes, the identification before the threading and the determination in the threading process can be carried out, and the checking is carried out after the main threading is finished, so that the steel strand is prevented from passing through wrong hole positions, and the correct threading of the steel strand is ensured.
Before all target tower top anchor holes, target tower bottom anchor holes, diagonal tower top anchor holes and diagonal tower bottom anchor holes are labeled, the method further comprises the installation steps of each installation device, namely:
erecting a reaction frame on the top of the tower;
arranging a winch, a pulley and a guide wheel on the ground;
respectively installing a tower top tower drum and a tower bottom tower drum at the tower top and the tower bottom;
and a plurality of tower top anchors and a plurality of tower bottom anchors are respectively arranged on the tower top tower barrel and the tower bottom tower barrel.
Firstly, erecting a reaction frame for cable penetration on the tower top, installing a winch, a pulley, a guide wheel and a pay-off reel on the ground, installing the winch and the pay-off reel at a position 1m outside a door opening, and placing two winches at two sides of the door opening; then, a tower top tower drum and a tower bottom tower drum are respectively arranged at the tower top and the tower bottom; finally, a plurality of tower top anchors are respectively installed on the tower top tower barrel, a plurality of tower bottom anchors are installed on the tower bottom tower barrel, when the plurality of tower top anchors and the plurality of tower bottom anchors are installed, the fact that each target tower top anchor hole and each diagonal tower top anchor hole are distributed along the tower top anchors in a 180-degree diagonal mode is guaranteed, similarly, each target tower bottom anchor hole and each diagonal tower bottom anchor hole are distributed along the tower bottom anchors in a 180-degree diagonal mode is guaranteed, and therefore the fact that the steel strands are vertically installed is guaranteed.
After the tower top anchorage device and the tower bottom anchorage device are installed, the method further comprises the step of steel strand blanking, namely:
hoisting the steel strand to the vicinity of the door opening;
erecting a pay-off rack;
paving a colored adhesive tape along the paving path of the steel strand, measuring the length of the required steel strand, and marking a first mark at the tail end of the colored adhesive tape;
measuring the blanking cutting-off position and marking a second label;
drawing the steel strand from the steel winch to a first marked position;
and cutting the steel strand at the position of the second mark.
In the blanking process, firstly, hoisting a pay-off reel wound with steel strands to the position near a door opening, and erecting a pay-off rack; secondly, paving a colored adhesive tape or a wood board or asbestos at the lower end of the steel strand along the paving path of the steel strand so as to prevent the PE skin of the steel strand from being damaged, and marking a first mark at the tail end of the colored adhesive tape; then, drawing the steel strand from a pay-off reel to the calculated length through a pay-off rack according to the blanking length, and marking a first mark at the tail end of the steel strand; thirdly, measuring the blanking cutting position and marking a second mark; and finally, pulling the steel strand out of the steel capstan, and cutting the steel strand by using a grinding machine when the end of the steel strand reaches the second mark position. It should be noted that during the blanking process, the heavy object rolling and the personnel trampling are strictly prohibited, and meanwhile, no open fire or welding spark contact is needed, so as to avoid the above situation, the method can adopt the methodFireproof asbestos covers the steel strands. In the blanking process, if the steel strand has PE skin damage, the steel strand needs to be wound by multiple times by using a black adhesive tape, and if the damage exceeds 3cm2The damaged PE skin of the steel strand section needs to be cut off.
In addition, before reeving, whether the equipment is intact and the trial run should be examined, still need to examine and reeve whether have debris or barrier in the passageway to clear up debris or barrier, in the way of advancing of steel strand wires, clear up edges and corners and iron plate that probably meet, in order to avoid damaging steel strand wires PE skin.
After the single steel strand is hung and established, need carry out the tension test to it, consequently, when carrying out the tension test, specifically carry out the following step:
measuring the tension force on the diagonally arranged steel strand by using a jack and a tension oil pump, and comparing the measured tension force with the specified minimum value and maximum value of the tension force;
tensioning the steel strand with insufficient tensioning force by using tensioning equipment, and loosening the steel strand by loosening the nut of the tower bottom anchorage device.
That is to say, after the reeving is accomplished, utilize haplopore jack and stretch-draw oil pump to stretch-draw single steel strand wires at the lower extreme of top end ground tackle, in this application, single steel strand wires are reeved and are accomplished the back, carry out tension test to it promptly, that is, every installation steel strand wires, stretch-draw once to it promptly, and single steel strand wires stretch-draw is accomplished the back, stretch-draw to the steel strand wires after the installation of diagonal department to ensure the tension force of each steel strand wires and close the rule. When the measured tension force is insufficient, the tensioning equipment is used for tensioning the steel strand with insufficient tension force to increase the tension force, and when the measured tension force is too large, the nut of the tower bottom anchorage device is unscrewed to adjust the tension force of the steel strand to decrease the tension force of the steel strand.
The cable force can be checked in each stage of construction or after bridge formation. The method comprises the steps of extracting 20% of steel strands from the whole cable body, and carrying out cable force inspection by using a calibrated single-hole jack and a digital display oil meter. By the method, the actual cable force in the whole construction process can be traced.
After the full-bridge steel cable is installed and adjusted, final assembly and protection of the stay cable are required. Specifically, shock absorbers are installed inside the tower top anchorage, inside the tower bottom anchorage, and between the tower top anchorage and the tower bottom anchorage. Through the installation of the shock absorber, the steel strand can be fixed at the center of the anchorage device, and the anchorage device is protected from being bent under the action of variable load and wind load, so that the installation firmness of the steel strand is improved.
That is to say, install the locator at the anchor end of top of the tower ground tackle and the stretch-draw end of tower ground tackle respectively to install the restraint circle on the steel strand wires between stretch-draw end and anchor end, the locator can be fixed the steel strand wires in the central point of top of the tower ground tackle and tower ground tackle, prevents steel strand wires installation skew, and the restraint circle can restrain the steel strand wires motion, thereby protects top of the tower ground tackle and tower ground tackle not receive variable load's influence, thereby promotes the fastness of top of the tower ground tackle and tower ground tackle installation.
After the restraint rings are installed at the tensioning end and the anchoring end, steel and chips after being cut need to be cut and cleaned according to the specified length of the steel strand, after the cutting and cleaning are completed, anticorrosion construction is carried out, namely, lubricating grease is filled into a gap between the extension pipe inside the tower top anchorage device and the steel strand and a gap between the extension pipe inside the tower bottom anchorage device and the steel strand, and the lubricating grease is coated on the steel strand which leaks outwards, so that the effects of corrosion prevention and rust prevention are achieved, the steel strand is effectively protected, and the service life of the steel strand is prolonged.
After the step of corrosion prevention of the steel strand, a locking nut needs to be installed on the steel strand leaking out of the tensioning end, so that the end part of the steel strand is clamped and fixed.
The method for installing the steel strand for the prestressed structure of the wind turbine support tower provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A steel strand installation method for a wind turbine support tower prestressed structure is characterized by comprising the following steps:
s11, respectively installing a tower top anchorage device and a tower bottom anchorage device to the tower top and the tower bottom, and coaxially arranging a target tower top anchor hole on the tower top anchorage device and a target tower bottom anchor hole on the tower bottom anchorage device;
s21, pulling a single steel strand into the target tower bottom anchor hole by using a winch, anchoring the steel strand in the target tower bottom anchor hole by using a tower bottom clamping piece, pulling the steel strand into the target tower top anchor hole corresponding to the target tower bottom anchor hole by using the winch, and anchoring the steel strand in the target tower top anchor hole by using the tower top clamping piece;
tensioning the single steel strand by using the jack;
pulling the other steel strand into a diagonal tower bottom anchor hole by using the winch, anchoring the steel strand in the diagonal tower bottom anchor hole, pulling the steel strand into a diagonal tower top anchor hole corresponding to the diagonal tower bottom anchor hole by using the winch, and anchoring the steel strand in the diagonal tower top anchor hole;
tensioning the steel strand by using a jack;
the diagonal tower top anchor holes and the target tower top anchor holes are distributed at an angle of 180 degrees, and the diagonal anchor bottom anchor holes and the target anchor bottom anchor holes are distributed at an angle of 180 degrees;
s31, changing the target tower bottom anchor holes and the corresponding target tower top anchor holes, and repeatedly executing the step S21 until the steel strands in the first preset number of target tower bottom anchor holes and the target tower top anchor holes are all hung, anchored and tensioned;
s41, transforming the tower bottom anchorage devices and the corresponding tower top anchorage devices, and repeatedly executing the steps S21 and S31 until the steel strands in the tower bottom anchorage devices and the corresponding tower top anchorage devices in a second preset number are all hung, anchored and tensioned.
2. The method of installing steel strands for a wind turbine generator support tower prestressed structure, according to claim 1, wherein said installing tower top anchorage and tower bottom anchorage to tower top and tower bottom, respectively, further comprises, before coaxially arranging a target tower top anchor hole on said tower top anchorage and a target tower bottom anchor hole on said tower bottom anchorage:
and marking all the target tower bottom anchor holes, all the corresponding target tower top anchor holes, all the diagonal tower bottom anchor holes and all the corresponding diagonal tower top anchor holes.
3. The method of claim 2, wherein said labeling all of said target tower bottom anchor openings, corresponding all of said target tower top anchor openings, all of said diagonal tower bottom anchor openings, and corresponding all of said diagonal tower top anchor openings further comprises:
erecting a reaction frame on the tower top;
arranging the winch, the pulley and the guide wheel on the ground;
respectively installing a tower top tower drum and a tower bottom tower drum at the tower top and the tower bottom;
and installing a plurality of tower top anchors and a plurality of tower bottom anchors on the tower top tower barrel and the tower bottom tower barrel respectively.
4. The method of installing steel strands for a wind turbine support tower prestressed structure, according to claim 3, wherein said installing a plurality of said tower top anchors and a plurality of said tower bottom anchors on said tower top tower and said tower bottom tower, respectively, further comprises:
hoisting the pay-off spool to the position near the door opening;
erecting a pay-off rack;
paving a colored adhesive tape along the paving path of the steel strand, measuring the length of the required steel strand, and marking a first mark at the tail end of the colored adhesive tape;
measuring the blanking cutting-off position and marking a second label;
drawing the steel strand from the steel winch to the first index position;
and cutting the steel strand at the second mark position.
5. The method for installing the steel strand for the wind turbine generator support tower prestressed structure according to any one of claims 1 to 4, wherein said tensioning the single steel strand by using a jack, and said tensioning the steel strand by using a jack further comprises:
measuring the tension force of the steel strand by using a single-hole jack and a tension oil pump;
tensioning the steel strand with insufficient tensioning force by using tensioning equipment, and loosening the steel strand by loosening the nut of the tower bottom anchorage device.
6. The method of installing steel strands for a wind turbine support tower prestressed structure as set forth in claim 5, wherein said tensioning said steel strands with insufficient tension force by means of a tensioning device, and after loosening said steel strands by unscrewing a nut of said tower bottom anchorage, further comprising:
and shock absorbers are respectively arranged in the tower bottom anchorage device, the tower top anchorage device and between the tower bottom anchorage device and the tower top anchorage device.
7. The method for installing steel strands for a wind turbine generator support tower prestressed structure, according to claim 6, characterized in that shock absorbers are installed respectively inside said tower bottom anchorage device, inside said tower top anchorage device and between said tower bottom anchorage device and said tower top anchorage device, specifically:
respectively installing positioners at the anchoring end of the tower top anchorage device and the tensioning end of the tower bottom anchorage device;
and a restraint ring is arranged on the steel strand between the tensioning end and the anchoring end.
8. The method of installing steel strands for a wind turbine support tower prestressed structure according to claim 7, wherein said installing a constraining ring on said steel strands between said tension end and said anchoring end further comprises:
cutting the steel strand;
and filling lubricating grease into a gap between the extension pipe inside the tower top anchorage device and the steel strand and a gap between the extension pipe inside the tower bottom anchorage device and the steel strand, and smearing the lubricating grease on the steel strand which leaks outwards.
9. The method of installing steel strands for a wind turbine support tower prestressed structure according to claim 8,
after lubricating grease is poured into the gap between the extension pipe inside the tower top anchorage device and the stranded wire and the gap between the extension pipe inside the tower bottom anchorage device and the steel stranded wire, and the steel stranded wire which leaks outwards is coated with the lubricating grease, the method further comprises the following steps:
and a locking nut is arranged on the steel strand at the tensioning end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811383914.5A CN111155822A (en) | 2018-11-20 | 2018-11-20 | Steel strand installation method for wind driven generator support tower frame prestressed structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811383914.5A CN111155822A (en) | 2018-11-20 | 2018-11-20 | Steel strand installation method for wind driven generator support tower frame prestressed structure |
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| CN111155822A true CN111155822A (en) | 2020-05-15 |
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| CN201811383914.5A Pending CN111155822A (en) | 2018-11-20 | 2018-11-20 | Steel strand installation method for wind driven generator support tower frame prestressed structure |
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Application publication date: 20200515 |