CN113123377A - Method for replacing anchor plate bolt of foundation of wind driven generator by excavating roadway - Google Patents
Method for replacing anchor plate bolt of foundation of wind driven generator by excavating roadway Download PDFInfo
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- CN113123377A CN113123377A CN202110516059.6A CN202110516059A CN113123377A CN 113123377 A CN113123377 A CN 113123377A CN 202110516059 A CN202110516059 A CN 202110516059A CN 113123377 A CN113123377 A CN 113123377A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000004567 concrete Substances 0.000 claims abstract description 34
- 238000010276 construction Methods 0.000 claims abstract description 21
- 238000007689 inspection Methods 0.000 claims abstract description 13
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 238000009412 basement excavation Methods 0.000 claims description 15
- 238000004140 cleaning Methods 0.000 claims description 10
- 239000002283 diesel fuel Substances 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000009966 trimming Methods 0.000 claims description 4
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000011083 cement mortar Substances 0.000 claims description 3
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/44—Foundations for machines, engines or ordnance
Abstract
The invention relates to a method for replacing anchor plate bolts of a foundation of a wind driven generator by excavating a roadway, which comprises the steps of excavating an open roadway, a horizontal roadway and an annular roadway, enabling personnel to enter the bottom of the foundation of the wind driven generator under the condition of not damaging the foundation of the wind driven generator, and carrying out maintenance and replacement on anchor bolts by chiseling the bottom of the anchor bolts, wherein the replacement method adopts clockwise symmetrical replacement; after the replacement is finished, performing under-tension inspection and over-tension inspection, finally filling grouted rubble blocks in the roadway in a segmented mode, and finally pumping micro-expansion concrete to fill and compact gaps between the grouted rubble and a foundation bottom plate, including a concrete chiseled part on the bottom plate; the invention solves the problems that the prior art has long construction period, needs to destroy the foundation of a fan, needs large-tonnage hoisting equipment to enter a field, has higher requirements on environmental places, has high cost and the like; the invention has the advantages of small engineering quantity and short construction period; the cost is saved, the foundation of the fan is not damaged, and large-tonnage hoisting equipment is not needed.
Description
Technical Field
The invention relates to the field of construction of large wind generating sets, in particular to a method for replacing anchor plate bolts of a foundation of a wind generating set by excavating a roadway.
Background
Sometimes, when 100% torque supertension construction is carried out on the hoisted fan anchor bolt, the phenomenon of failure of nut thread tripping on individual anchor bolts occurs due to the problems of nuts or anchor bolt materials and the like; the conventional method is to remove a fan and a tower frame, break the fan foundation and rebuild the fan foundation, then reassemble the unit, the cost is higher than that of a newly-built wind generating set, the construction period is more than 3 months, the construction difficulty is high, a large-tonnage crane needs to be organized to enter a field, the field requirement is high, and great loss is caused.
Disclosure of Invention
The invention aims to solve the problems and provides a method for excavating a roadway to replace bolts of a foundation anchor plate of a wind driven generator.
1. The specific scheme of the invention is as follows: a method for excavating a roadway to replace bolts of anchor plates of a foundation of a wind driven generator comprises the following steps:
s1, excavating an open channel; digging an open channel at the periphery of the fan;
s2, erecting a steel channel; after the open channel is finished, a steel channel is erected at the front end;
s3, excavating a horizontal roadway; after the open channel is excavated, erecting a steel channel, covering earthwork on the steel channel, and excavating a horizontal roadway at the extending part of the steel channel;
s4, excavating an annular roadway; taking the midpoint of the horizontal roadway at the underground ring beam as a reference point, calibrating the excavation direction by calculating the change values of the arch height and the chord length of each interval set value in the center line of the annular roadway, and excavating the annular roadway;
s5, measuring, positioning and marking the nut; measuring the coordinates of the lengthened anchor bolts by using a total station on the ground, recording, then turning to a point to a roadway, marking the corresponding anchor bolt positions by using a polar coordinate method, then positioning the center line positions of the prestressed anchor bolts on the ring beam according to the coordinates, and marking the center lines of the anchor bolts by using red paint along the basic ring beam; the positions of other prestressed anchor bolts are measured in sections by marking elongated anchor bolts on the foundation bottom and are respectively marked on the foundation bottom plate;
s6, cutting off the lower anchor plate supporting column by using a cutting tool;
s7, chiseling the concrete around the anchor bolt at the bottom of the foundation;
s8, checking the corresponding relation of the upper end and the lower end of the anchor bolt, after drilling the concrete at the window of the anchor bolt, slightly knocking the end part of the anchor bolt on the ground by using a wooden hammer, and recognizing the position of the lower end of the re-checking anchor bolt by hearing sound to ensure the consistency of loosening and replacing the nut of the prestressed anchor bolt in the next step;
s9, loosening and unloading anchor bolts for prestress, wherein when a group of prestressed anchor bolts which are rechecked and chiseled are in one-to-one correspondence from top to bottom, the top of an anchor plate on a fan is symmetrically loosened one by a solid wrench matched with a hydraulic stretcher, and the prestress is unloaded to 0;
s10, chiseling concrete in the periphery range of the prestressed anchor bolt, chiseling the inverted plate concrete outside the anchor bolt area, and then continuing to visually chiseling the hard concrete in the interval of anchor bolts in the area from outside to inside;
s11, cleaning the prestressed anchor bolt and finishing the external thread of the prestressed anchor bolt, brushing the surface of the exposed anchor bolt with diesel oil, and then polishing and removing slag with a steel wire brush;
s12, replacing a new nut, and after cleaning and finishing the anchor bolt, dismantling the old nut by using a self-made steel sleeve and a torque wrench; cleaning an original nut gasket and installing a new matched nut after an old nut is removed, fastening the nut after the nut is installed, replacing the nut, and finally screwing down to reach a design requirement torsion value, wherein no gap exists between the newly arranged nut, the gasket and the anchor plate;
s13, performing supertension on the prestressed anchor bolt, applying 70% of tensioning prestress for the first time to perform primary fastening when performing prestressed tensioning on the anchor bolt with the replaced nut, performing secondary tensioning after stabilizing for a set time, and applying 100% of prestress; performing under-tension inspection and over-tension inspection at the moment;
s14, when a fan foundation is completely replaced by all nuts, and the construction is completed by re-tensioning, filling and sealing the grouted rubble in a roadway in sections, and finally pumping micro-expansion concrete to fill and compact the gap between the grouted rubble and the foundation bottom plate, including the gap of the concrete chiseled part on the bottom plate;
and S15, chiseling bottom plate concrete at the position of the anchor bolt according to the clockwise direction after the anchor bolt tensioning is finished after each group of nuts are replaced, and replacing the nuts and tensioning the anchor bolts according to the sequence.
Further, in step S3, the construction is directed by the theodolite to the center direction of the tower body, a horizontal roadway with a width of 0.9m, a height of 1.8m and a length of 7.5m is excavated by the pneumatic pick, and the earthwork is manually transported out of the field.
Further, in the step S4, for each 2 m of the horizontal tunnel and the annular tunnel, cement mortar with a thickness of 100mm and a ratio of 1: 3 is used for wall protection.
Further, the method for excavating the roadway to replace the anchor plate bolt of the foundation of the wind driven generator according to claim 1 is characterized in that: in step S6, the lower anchor plate support post is cut off using an oxygen, acetylene cutter.
Further, in step S7, when the first group of chiseling constructions is performed, a 50cm chiseling window area is first defined at the bottom of the foundation according to the pre-stressed anchor rod positions marked on the foundation slab and the 12 symmetrical loosening replacement plans; then, three crack guide holes ∅ 50mm with the depth of 250mm are drilled at the outer, middle and inner rows of three positions at the middle part of the window area, avoiding the anchor bolt position, and then concrete except the prestressed anchor bolt is chiseled by an electric hammer along the crack guide holes, wherein the electric hammer is prevented from contacting and damaging the anchor bolt in the chiseling process of the concrete.
Further, in step S10, chiseling is performed using a BOSH electric hammer.
Further, in step S11, after cleaning, if the outer anchor wire is found to be slightly damaged, the M42 inner wire sleeve is used to perform torque wire feeding trimming on the slightly bent anchor wire opening.
Further, in the step S12, the homemade sleeve is formed by welding an old nut to the lower end of the sleeve, wherein the inner diameter of the upper part of the homemade sleeve is matched with the outer diameter of the M42 nut.
Further, in step S12, the replacement nut is finally tightened to the design torque value of 300N · M.
Further, in step S13, an under-tension check: stretching the anchor bolt until the acceptance tension is 508kN, and if no gap exists between the nut and the anchor plate and the nut cannot be screwed by applying 100 N.m of torque by using a spanner, the anchor bolt is qualified; and (4) over-tension inspection: stretching the anchor bolt to a tension of 585kN, and if no gap exists between the nut and the anchor plate and the nut cannot be screwed by applying a torque of 100 N.m by using a spanner, indicating that the anchor bolt is over-stretched; and (3) continuously and slowly pressurizing the prestress, loosening the nut when the nut can be screwed, re-pressurizing to 585kN of over-tension force after the hydraulic stretcher is relieved, and screwing the nut to finish the re-fastening of the anchor bolt.
The invention has the following beneficial effects:
1. the invention has short construction period, saves working hours and greatly improves working efficiency;
2. the invention does not need large-tonnage hoisting equipment, and has low construction environment requirement;
3. the invention does not need to break the foundation and rebuild, and does not need to reassemble the machine set;
4. the invention greatly saves the construction cost and the material cost.
Drawings
FIG. 1 is a schematic view of a wind turbine infrastructure;
FIG. 2 is a schematic view of the excavation section of an open channel, a horizontal roadway and an annular roadway;
FIG. 3 is a schematic view of a support post installation;
FIG. 4 is an enlarged view of section I of FIG. 1;
FIG. 5 is an enlarged view of section K of FIG. 1;
FIG. 6 is a schematic plan view of a horizontal roadway and a circular roadway;
FIG. 7 is a schematic plan view of the support columns of the lower anchor plate;
FIG. 8 is a schematic view of a tamper drill hole;
FIG. 9 is a schematic view of the corresponding relationship between the composite upper and lower anchors;
FIG. 10 is a schematic view of anchor bolt relaxation unloading;
FIG. 11 is a schematic diagram illustrating a prestressed anchor bolt being painted with diesel oil for wetting and cleaned with a steel wire brush;
FIG. 12 is a schematic view of the removal of an old nut and the replacement of a new nut using a torque wrench and a home-made sleeve;
FIG. 13 is a schematic diagram of overstretching of a prestressed anchor bolt;
in the figure: 1-a fan foundation, 2-an open channel, 3-a steel channel, 4-a horizontal roadway, 5-a circular roadway, 6-an anchor bolt, 7-an upper anchor plate, 8-a lower anchor plate, 9-a self-made sleeve, 10-a torque wrench, 11-a hydraulic stretcher, 12-a solid plum wrench, 13-a support column and 14-red paint.
Detailed Description
Referring to fig. 1 to 13, the embodiment is a method for replacing anchor plate bolts of a foundation of a wind driven generator by excavating a roadway, and the method specifically includes the following steps:
1. determining the replacement sequence and process of the nuts;
the engineering fan foundation 1 is provided with one hundred, seventy-six anchor bolts 6, wherein eight lengthened positioning anchor bolts 6 are 4015mm long, the rest length is about 3975mm, and each lengthened positioning anchor bolt 6 corresponds to each lower anchor plate 8 to support an embedded part;
and (4) replacing the nuts to construct the balance, replacing six groups of the nuts at two symmetrical sides every time, and sequentially and circularly constructing twelve groups of the nuts at two sides.
2. Excavating an open channel 2;
each fan digs an annular tunnel 5, a horizontal tunnel 4 and an open-air channel 2 under the basic ring beam; the number of the open-air channels 2 is one, the landform which is favorable for roadway excavation and the cable trench avoiding are selected, the open-air channels 2 are excavated by an excavator, the horizontal projection length is 14m, and the depth is 5.5 m.
3. Excavating a horizontal roadway 4;
after the open channel 2 is excavated, erecting a steel channel 3, covering earthwork on the steel channel, and excavating a horizontal roadway 4 at the extending part of the steel channel 3;
the construction is guided by the theodolite aiming at the center direction of the tower body, a horizontal roadway 4 with the width of 0.9m, the height of 1.8m and the length of 7.5m is excavated by an air pick, and the earthwork is manually transported out of the field.
4. Excavating an annular roadway 5;
taking the midpoint of the horizontal tunnel 4 at the underground ring beam as a datum point, calibrating the excavation direction by calculating the change values of arch height and chord length at intervals of 50cm of the center line of the annular tunnel 5, and excavating the annular tunnel 5 by adopting a pick excavation and manual trolley deslagging method; when the construction is carried out to the underground cable pipe embedding position, the construction needs to be carried out carefully, and the cable pipe is forbidden to be chiseled;
the horizontal tunnel 4 and the annular tunnel 5 are used for wall protection by cement mortar with the thickness of 100mm and the ratio of 1: 3 every two meters.
5. Measuring, positioning and marking the nut;
firstly, measuring the coordinates of the lengthened anchor bolt 6 on the ground by using a total station, recording, then turning to a point to a roadway and marking the corresponding position of the anchor bolt 6 by using a polar coordinate method, positioning the anchor bolt 6 when the anchor bolt 6 is embedded and installing the support column 13 at the position of the lengthened anchor bolt 6, then positioning the position of the center line of the prestressed anchor bolt 6 on the ring beam according to the position, and marking the center line of the anchor bolt 6 by using red paint 14 along the basic ring beam;
and the positions of other prestressed anchor bolts 6 are measured in sections by marking the lengthened anchor bolts 6 on the foundation bottom and are respectively marked on the foundation bottom plate.
6. And cutting off 8 supporting columns 13 of the lower anchor plate 8 by adopting an oxygen and acetylene cutter.
7. Chiseling the concrete around the anchor bolt 6 at the bottom of the foundation;
when the first group of chiseling construction is carried out, a 50cm chiseling window area is marked at the bottom of the foundation through the position of a prestressed anchor rod marked on a foundation bottom plate; secondly, drilling ∅ 50mm three crack guide holes with the depth of 250mm at three positions of an outer row, a middle row and an inner row at the middle part of the window area, avoiding the position of the anchor bolt 6, and then chiseling concrete except the prestressed anchor bolt 6 by using an electric hammer along the crack guide holes, wherein in the chiseling process of the concrete, the electric hammer is prevented from contacting and damaging the anchor bolt 6;
8. rechecking the corresponding relation of the upper anchor bolt and the lower anchor bolt 6;
after drilling the concrete at the window of the anchor bolt 6, lightly tapping the head of the anchor bolt 6 on the ground by using a wooden hammer, and hearing to distinguish and recheck the position of the head of the anchor bolt 6, so as to ensure the consistency of loosening and replacing the nut of the prestressed anchor bolt 6 in the next step.
9. Loosening and unloading the prestress of the anchor bolt 6;
after a group of twelve pre-stressed anchor bolts 6 which are rechecked and chiseled are in one-to-one correspondence from top to bottom, a solid wrench 12 is used for matching with a hydraulic stretcher 11 to symmetrically loosen the top of an anchor plate 7 on the fan one by one, and the pre-stress is unloaded to 0.
10. Picking and chiseling concrete within 6 circles of the prestressed anchor bolt;
adopt BOSH electric hammer with 6 outside fall board concrete chisels the back, continue again to carry out visual inspection chisels to 6 interval internal hard concrete outside-in of crab-bolt in the region, when chiseling 6 regions of crab-bolt soon, need be under construction carefully, avoid causing the harm to crab-bolt 6, forbid blind chisel strictly and lead to chiseling 6 screw mouths of crab-bolt.
11. Cleaning a prestressed anchor bolt 6 and trimming an external thread of the prestressed anchor bolt 6;
after the surface of the exposed anchor bolt 6 is coated with diesel oil, a steel wire brush is adopted for polishing and slag removal; after cleaning, if the outer wire of the anchor bolt 6 is found to be slightly damaged, torque wire feeding trimming is carried out on the wire opening of the slightly-bent anchor bolt 6 by using the M42 inner wire sleeve.
12. Replacing the new nut;
after the anchor bolts 6 are cleaned and finished, the old nuts are dismantled by the self-made steel sleeves and the torque wrench 10; the inner diameter of the upper part of the self-made sleeve 9 is matched with the outer diameter of an M42 nut, an old nut is welded at the lower end of the sleeve, an original nut gasket is cleaned and a new M42 nut is installed after the old nut is removed, a torque wrench and a sleeve are adopted to fasten the nut after the nut is installed, the nut is replaced, the final tightening is carried out until the design requirement torsion is 300 N.M, and no gap exists between the newly-arranged nut, the gasket and an anchor plate; when the first group of nuts are replaced, the windows are chiseled out in the previous group as free surfaces, the positions of the anchor bolts 6 are avoided, and concrete except the prestressed anchor bolts 6 is chiseled out by using a hammer until the concrete at the position of the anchor bolt 6 in the next group is chiseled out.
13. The prestressed anchor bolt 6 is subjected to over-tensioning;
when the twelve anchor bolts 6 with the replaced nuts are subjected to prestress tensioning, 70 percent of tensioning prestress is applied for the first time to carry out initial fastening, namely 410KN prestress is applied, and the reading of a hydraulic stretcher reaches 599 MP; after stabilizing for two minutes, performing second tensioning, and applying 100% prestress, namely the tension reaches 585KN, and the torque reading of the hydraulic stretcher reaches 855 MP; performing under-tension inspection and over-tension inspection at the moment;
under-tension inspection: stretching the anchor bolt 6 to an acceptance tension 508kN, wherein no gap exists between the nut and the anchor plate, and the nut cannot be screwed by applying a torque of 100 N.m by using a spanner, so that the anchor bolt 6 is qualified;
and (4) over-tension inspection: stretching the anchor bolt 6 to a tension of 585kN, and if no gap exists between the nut and the anchor plate and the nut cannot be screwed by applying a torque of 100 N.m by using a spanner, indicating that the anchor bolt 6 is over-stretched; and (3) continuously and slowly pressurizing the prestress, loosening the nut when the nut can be screwed, re-pressurizing to 585kN of over-tension force after the pressure of the stretcher is relieved, and screwing the nut to finish the re-fastening of the anchor bolt 6.
14. After each group of nuts is replaced and the anchor bolts 6 are tensioned, the bottom plate concrete at the next group of anchor bolts 6 is chiseled in the clockwise direction, and the nuts and the anchor bolts 6 are replaced according to the sequence.
15. When one fan foundation 1 is completely replaced by all nuts and the re-tensioning construction is finished, filling and plugging the grouted rubble in the roadway in sections, and finally filling and compacting the gap between the grouted rubble and the foundation bottom plate, including the gap of the concrete chiseled on the bottom plate, by pumping micro-expansion concrete.
Claims (10)
1. A method for replacing a bolt of a foundation anchor plate of a wind driven generator by excavating a roadway is characterized by comprising the following steps:
s1, excavating an open channel; digging an open channel at the periphery of the fan;
s2, erecting a steel channel; after the open channel is finished, a steel channel is erected at the front end;
s3, excavating a horizontal roadway; after the open channel is excavated, erecting a steel channel, covering earthwork on the steel channel, and excavating a horizontal roadway at the extending part of the steel channel;
s4, excavating an annular roadway; taking the midpoint of the horizontal roadway at the underground ring beam as a reference point, calibrating the excavation direction by calculating the change values of the arch height and the chord length of each interval set value in the center line of the annular roadway, and excavating the annular roadway;
s5, measuring, positioning and marking the nut; measuring the coordinates of the lengthened anchor bolts by using a total station on the ground, recording, then turning to a point to a roadway, marking the corresponding anchor bolt positions by using a polar coordinate method, then positioning the center line positions of the prestressed anchor bolts on the ring beam according to the coordinates, and marking the center lines of the anchor bolts by using red paint along the basic ring beam; the positions of other prestressed anchor bolts are measured in sections by marking elongated anchor bolts on the foundation bottom and are respectively marked on the foundation bottom plate;
s6, cutting off the lower anchor plate supporting column by using a cutting tool;
s7, chiseling the concrete around the anchor bolt at the bottom of the foundation;
s8, checking the corresponding relation of the upper end and the lower end of the anchor bolt, after drilling the concrete at the window of the anchor bolt, slightly knocking the end part of the anchor bolt on the ground by using a wooden hammer, and recognizing the position of the lower end of the re-checking anchor bolt by hearing sound to ensure the consistency of loosening and replacing the nut of the prestressed anchor bolt in the next step;
s9, loosening and unloading anchor bolts for prestress, wherein when a group of prestressed anchor bolts which are rechecked and chiseled are in one-to-one correspondence from top to bottom, the top of an anchor plate on a fan is symmetrically loosened one by a solid wrench matched with a hydraulic stretcher, and the prestress is unloaded to 0;
s10, chiseling concrete in the periphery range of the prestressed anchor bolt, chiseling the inverted plate concrete outside the anchor bolt area, and then continuing to visually chiseling the hard concrete in the interval of anchor bolts in the area from outside to inside;
s11, cleaning the prestressed anchor bolt and finishing the external thread of the prestressed anchor bolt, brushing the surface of the exposed anchor bolt with diesel oil, and then polishing and removing slag with a steel wire brush;
s12, replacing a new nut, and after cleaning and finishing the anchor bolt, dismantling the old nut by using a self-made steel sleeve and a torque wrench; cleaning an original nut gasket and installing a new matched nut after an old nut is removed, fastening the nut after the nut is installed, replacing the nut, and finally screwing down to reach a design requirement torsion value, wherein no gap exists between the newly arranged nut, the gasket and the anchor plate;
s13, performing supertension on the prestressed anchor bolt, applying 70% of tensioning prestress for the first time to perform primary fastening when performing prestressed tensioning on the anchor bolt with the replaced nut, performing secondary tensioning after stabilizing for a set time, and applying 100% of prestress; performing under-tension inspection and over-tension inspection at the moment;
s14, when a fan foundation is completely replaced by all nuts, and the construction is completed by re-tensioning, filling and sealing the grouted rubble in a roadway in sections, and finally pumping micro-expansion concrete to fill and compact the gap between the grouted rubble and the foundation bottom plate, including the gap of the concrete chiseled part on the bottom plate;
and S15, chiseling bottom plate concrete at the position of the anchor bolt according to the clockwise direction after the anchor bolt tensioning is finished after each group of nuts are replaced, and replacing the nuts and tensioning the anchor bolts according to the sequence.
2. The method for replacing the anchor plate bolt of the foundation of the wind driven generator in the excavation roadway according to claim 1, which is characterized in that: in the step S3, the construction is guided by the theodolite to the center direction of the tower body, a horizontal roadway with the width of 0.9m, the height of 1.8m and the length of 7.5m is excavated by an air pick, and earthwork is manually transported out of the site.
3. The method for replacing the anchor plate bolt of the foundation of the wind driven generator in the excavation roadway according to claim 1, which is characterized in that: in the step S4, for each 2 m of horizontal and circular tunnels, cement mortar with a thickness of 100mm and a ratio of 1: 3 is used for wall protection.
4. The method for replacing the anchor plate bolt of the foundation of the wind driven generator in the excavation roadway according to claim 1, which is characterized in that: in step S6, the lower anchor plate support post is cut off using an oxygen, acetylene cutter.
5. The method for replacing the anchor plate bolt of the foundation of the wind driven generator in the excavation roadway according to claim 1, which is characterized in that: in step S7, when the first group of chiseling constructions is performed, a 50cm chiseling window area is first cut at the bottom of the foundation according to the pre-stressed anchor rod positions marked on the foundation slab and a 12-group symmetrical tension-loosening replacement plan; then, three crack guide holes ∅ 50mm with the depth of 250mm are drilled at the outer, middle and inner rows of three positions at the middle part of the window area, avoiding the anchor bolt position, and then concrete except the prestressed anchor bolt is chiseled by an electric hammer along the crack guide holes, wherein the electric hammer is prevented from contacting and damaging the anchor bolt in the chiseling process of the concrete.
6. The method for replacing the anchor plate bolt of the foundation of the wind driven generator in the excavation roadway according to claim 1, which is characterized in that: in step S10, chiseling is performed using a BOSH electric hammer.
7. The method for replacing the anchor plate bolt of the foundation of the wind driven generator in the excavation roadway according to claim 1, which is characterized in that: in step S11, after cleaning, if the outer anchor wire is found to be slightly damaged, the M42 inner wire sleeve is used to perform torque wire-moving trimming on the slightly-bent anchor wire opening.
8. The method for replacing the anchor plate bolt of the foundation of the wind driven generator in the excavation roadway according to claim 1, which is characterized in that: in the step S12, the self-made sleeve is formed by welding an old nut at the lower end of the sleeve, wherein the inner diameter of the upper part of the self-made sleeve is matched with the outer diameter of the M42 nut.
9. The method for replacing the anchor plate bolt of the foundation of the wind driven generator in the excavation roadway according to claim 1, which is characterized in that: in step S12, the replacement nut is finally tightened to the design required torque value of 300N · M.
10. The method for replacing the anchor plate bolt of the foundation of the wind driven generator in the excavation roadway according to claim 1, which is characterized in that: in step S13, under-tension inspection: stretching the anchor bolt until the acceptance tension is 508kN, and if no gap exists between the nut and the anchor plate and the nut cannot be screwed by applying 100 N.m of torque by using a spanner, the anchor bolt is qualified; and (4) over-tension inspection: stretching the anchor bolt to a tension of 585kN, and if no gap exists between the nut and the anchor plate and the nut cannot be screwed by applying a torque of 100 N.m by using a spanner, indicating that the anchor bolt is over-stretched; and (3) continuously and slowly pressurizing the prestress, loosening the nut when the nut can be screwed, re-pressurizing to 585kN of over-tension force after the hydraulic stretcher is relieved, and screwing the nut to finish the re-fastening of the anchor bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110516059.6A CN113123377A (en) | 2021-05-12 | 2021-05-12 | Method for replacing anchor plate bolt of foundation of wind driven generator by excavating roadway |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110516059.6A CN113123377A (en) | 2021-05-12 | 2021-05-12 | Method for replacing anchor plate bolt of foundation of wind driven generator by excavating roadway |
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| CN113123377A true CN113123377A (en) | 2021-07-16 |
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| CN (1) | CN113123377A (en) |
Citations (5)
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Application publication date: 20210716 |