CN110258679B - Jacking and inclination correcting method for fan foundation - Google Patents

Jacking and inclination correcting method for fan foundation Download PDF

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Publication number
CN110258679B
CN110258679B CN201910583433.7A CN201910583433A CN110258679B CN 110258679 B CN110258679 B CN 110258679B CN 201910583433 A CN201910583433 A CN 201910583433A CN 110258679 B CN110258679 B CN 110258679B
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China
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foundation
jacking
fan foundation
pile pier
pile
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CN110258679A (en
Inventor
张志强
刘麾
程鹏
陈爱新
尚敏帅
林伟
李平平
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China Energy Engineering Group Liaoning Electric Power Survey & Design Institute Co ltd
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China Energy Engineering Group Liaoning Electric Power Survey & Design Institute Co ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D35/00Straightening, lifting, or lowering of foundation structures or of constructions erected on foundations

Abstract

The invention discloses a jacking and correcting method of a fan foundation, which comprises the steps of firstly excavating a working pit below the fan foundation to form a circumferential working surface, then arranging pile piers on the circumferential working surface at intervals, arranging jacks on the pile piers, jacking through the jacks to enable the fan foundation to reach a specified levelness, then arranging cushion blocks and wedge-shaped steel plates on the fan foundation to enable the cushion blocks and the wedge-shaped steel plates to stably support the fan foundation, then symmetrically removing the jacks on the pile piers, then planting ribs below the fan foundation and binding with main ribs of the pile piers, carrying out secondary grouting of fine aggregate concrete, carrying out slurry twisting treatment on dry and hard fine aggregate concrete, finally backfilling the working pit, and restoring the ground. The jacking and rectifying method for the fan foundation has reasonable steps, can eliminate the uneven settlement of the fan foundation and achieves the effect of safe and reliable structure.

Description

Jacking and inclination correcting method for fan foundation
Technical Field
The invention belongs to the technical field of electric power engineering, and particularly provides a jacking and rectifying method for a fan foundation.
Background
With the strategy of vigorously developing new energy in China, the utilization of many new energy sources, such as wind energy, solar energy and nuclear energy, has been rapidly developed in recent years, wherein the renewable resource, wind energy, is particularly widely popularized for life and work services.
In a wind power plant, a fan foundation is a particularly important structure, once problems occur, huge economic loss and adverse social influence are brought, but various problems cannot be avoided by the fan foundation in individual projects due to various reasons, the problem of uneven settlement is particularly obvious, and if dismantling measures are taken, huge influence is brought to construction period and construction cost, so scientific measures and measures are taken for treatment.
Therefore, a jacking and inclination correcting method for a fan foundation is provided to effectively solve the problem of uneven settlement of the fan foundation, which is a problem to be solved urgently.
Disclosure of Invention
In view of this, the present invention provides a method for jacking and correcting a wind turbine foundation, so as to solve the problem of uneven settlement of the wind turbine foundation.
The technical scheme provided by the invention is as follows: the jacking and rectifying method of the wind turbine foundation comprises the following steps:
step 1: excavating a working pit around the fan foundation with uneven settlement, and forming a circumferential working surface below the fan foundation so as to facilitate construction by constructors;
step 2: excavating pile pier holes on the circumferential working surface at intervals, and meeting the depth requirement of a foundation bearing layer;
and step 3: after the pile pier hole is formed, a bound reinforcement cage is put in and concrete is poured to form a pile pier, wherein the top surface of the pile pier is higher than a working surface, the reinforcement cage comprises a pile pier main reinforcement and a pile pier stirrup, the pile pier main reinforcement is higher than the top surface of the pile pier, and a connecting space is reserved between the top surface of the pile pier and the fan foundation;
and 4, step 4: after the concrete strength of the pile pier meets the requirement, at least one group of jacks is symmetrically arranged above each pile pier, and strain gauges are uniformly adhered to the top surface of the fan foundation and used for monitoring whether the fan foundation cracks or not;
and 5: jacking the deposition side of the fan foundation through the jack until the fan foundation reaches a specified levelness, wherein in the jacking process of the jack, continuously observing the resistance value change of the strain gauge, and if the resistance value change exceeds a preset threshold value, finishing jacking in advance;
step 6: when the wind turbine foundation reaches the specified levelness, the jack stops jacking, then a cushion block is arranged at the top of each pile pier, a wedge-shaped steel plate is stuffed between the cushion block and the bottom surface of the wind turbine foundation to realize stable support of the wind turbine foundation, then the jack on each pile pier is symmetrically removed until the jack is completely removed, wherein in the process of removing the jack, the resistance value change of the strain gauge and the levelness change of the wind turbine foundation are continuously observed, if the change exceeds a threshold value, the removal of the jack is finished in advance, and the removal is continued after adjustment;
and 7: drilling a hole below the fan foundation, inserting a fan foundation embedded bar into the hole and filling a bar planting adhesive, wherein the fan foundation embedded bar corresponds to the pile pier main bar higher than the top surface of the pile pier one by one, after the bar planting adhesive is solidified, binding the pile pier main bar and the fan foundation embedded bar, arranging a hoop bar, watering and wetting the top surface of the pile pier, erecting a template, and pouring concrete to form a fine aggregate concrete secondary grouting layer, wherein a gap is reserved between the fine aggregate concrete secondary grouting layer and the bottom surface of the fan foundation, after the strength of the fine aggregate concrete secondary grouting layer meets the requirement, watering and wetting the bottom surface of the fan foundation, and performing mortar twisting treatment by using dry and hard fine aggregate concrete to form a dry and hard fine aggregate concrete mortar twisting layer;
and 8: and backfilling the working pit and recovering the ground.
Preferably, in the step 2, the pile pier is an expanded-head pile pier, so that the bearing capacity of the pile pier can be increased, and the pile length can be reduced.
Further preferably, in step 4, the upper and lower portions of the jack are provided with steel plates for jacking, so that loads can be dispersed, and local cracking of the structure is avoided.
Preferably, in the step 5, the jack jacks the fan foundation at a constant speed, and the jacking speed is less than 3 mm/min.
Further preferably, in step 5, the levelness of the fan foundation is obtained by a level detection device arranged on a foundation ring above the fan foundation.
Preferably, in step 5, if the resistance value change exceeds a preset threshold value, the jacking is ended in advance, the circumferential working surface is expanded inwards under the fan foundation, then, according to steps 2 to 4, the pile pier and the jack are additionally arranged on the inner side of the original pile pier, and then, the step 5 is continuously executed.
Further preferably, in step 6, the cushion blocks arranged at the top of the pile pier comprise a large cushion block and a small cushion block, wherein the large cushion block is arranged in the middle above the pile pier, and the small cushion blocks are multiple and are arranged around the large cushion block at intervals.
Further preferably, in the step 7, a gap of 50-100 mm is reserved between the fine aggregate concrete secondary grouting layer and the bottom surface of the fan foundation.
Preferably, the level measuring device on the foundation ring and the resistance value monitoring device of the strain gauge are connected with a controller for controlling the lifting of the jack.
The invention provides a jacking and rectifying method of a fan foundation, which comprises the steps of firstly excavating a working pit below the fan foundation to form a circumferential working surface, then arranging pile piers on the circumferential working surface at intervals, arranging jacks on the pile piers, enabling the fan foundation to reach a specified levelness through jacking of the jacks, then arranging cushion blocks and wedge-shaped steel plates on the fan foundation, enabling the cushion blocks and the wedge-shaped steel plates to stably support the fan foundation, then symmetrically removing the jacks on the pile piers, then planting ribs below the fan foundation and binding with main ribs of the pile piers, carrying out secondary grouting of fine aggregate concrete, carrying out slurry treatment on dry and hard fine aggregate concrete, finally backfilling the working pit, restoring the ground, and completing jacking and rectifying of the fan foundation.
The jacking and rectifying method for the fan foundation provided by the invention has reasonable steps, can eliminate the uneven settlement of the fan foundation and achieves the effect of safe and reliable structure.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a cross-sectional view of a wind turbine foundation and pier;
fig. 2 is a plan layout view of the pier;
FIG. 3 is a plan view of the location of the piers, blocks and jacks;
FIG. 4 is a connection diagram of a wind turbine foundation and a pile pier;
in the figure, 1, a fan foundation; 2. a foundation ring; 3. pile pier; 4. pile pier main reinforcement; 5. pile pier stirrups; 6. a working pit; 7. planting ribs in the fan foundation; 8. a jack; 9. a steel plate for jacking; 10. a strain gauge; 11. a small cushion block; 12. a large cushion block; 13. a wedge-shaped steel plate; 14. secondary grouting of fine aggregate concrete; 15. and (5) twisting the slurry layer with the dry and hard fine aggregate concrete.
Detailed Description
The invention will be further explained with reference to specific embodiments, without limiting the invention.
As shown in fig. 1 to 4, the invention provides a jacking and rectifying method of a wind turbine foundation, which comprises the following steps:
step 1: excavating a working pit 6 around the fan foundation with uneven settlement, and forming a circumferential working surface below the fan foundation 1 so as to facilitate construction by constructors;
step 2: excavating pile pier holes on the circumferential working surface at intervals, and meeting the depth requirement of a foundation bearing layer;
and step 3: after the pile pier hole is formed, a bound reinforcement cage is put in and concrete is poured to form a pile pier 3, wherein the top surface of the pile pier 3 is higher than a working surface, the reinforcement cage comprises a pile pier main rib 4 and a pile pier stirrup 5, the pile pier main rib 4 is higher than the top surface of the pile pier 3, and a connecting space is reserved between the top surface of the pile pier 3 and the fan foundation 1;
and 4, step 4: after the concrete strength of the pile pier 3 meets the requirement, at least one group of jacks 8 are symmetrically arranged above each pile pier 3, and strain gauges 10 are uniformly adhered to the top surface of the fan foundation 1 and used for monitoring whether cracks occur in the fan foundation 1;
and 5: jacking the deposition side of the fan foundation 1 through the jack 8 until the fan foundation 1 reaches a specified levelness, wherein in the jacking process of the jack 8, continuously observing the resistance value change of the strain gauge 10, and if the resistance value change exceeds a preset threshold value, finishing jacking in advance;
step 6: when the wind turbine foundation 1 reaches a specified levelness, the jack 8 stops jacking, then a cushion block is arranged at the top of each pile pier 3, the cushion block is a prefabricated cushion block, a wedge-shaped steel plate 13 is stuffed between the cushion block and the bottom surface of the wind turbine foundation to realize stable support of the wind turbine foundation 1, then the jack 8 on each pile pier 3 is symmetrically removed until the jack is completely removed, wherein in the process of removing the jack, the resistance value change of a strain gauge and the levelness change of the wind turbine foundation are continuously observed, if the change exceeds a threshold value, the removal of the jack is finished in advance, and the jack is continuously removed after adjustment;
and 7: drilling a hole below the fan foundation 1, inserting the fan foundation embedded bar 7 into the hole and filling the embedded bar glue, wherein, the embedded bars 7 of the fan foundation are in one-to-one correspondence with the main bars 4 of the pile pier which are higher than the top surface of the pile pier, after the embedded bar glue is solidified, binding the pile pier main reinforcement 4 and the fan foundation embedded reinforcement 7, arranging stirrups, watering and wetting the top surface of the pile pier, erecting a template, pouring concrete to form a fine aggregate concrete secondary grouting layer 14, wherein, a gap is reserved between the fine aggregate concrete secondary grouting layer 14 and the bottom surface of the fan foundation 1, after the strength of the fine aggregate concrete secondary grouting layer 14 meets the requirement, watering and wetting the top surface of the fan foundation, watering and wetting the bottom surface of the fan foundation, and performing slurry twisting treatment by using dry and hard fine aggregate concrete to form a dry and hard fine aggregate concrete slurry twisting layer 15, wherein the dry and hard fine aggregate concrete slurry twisting treatment can better increase the compressive strength;
and 8: and backfilling the working pit and recovering the ground.
The jacking and rectifying method of the fan foundation comprises the steps of firstly excavating a working pit below the fan foundation to form a circumferential working surface, then arranging pile piers on the circumferential working surface at intervals, arranging jacks on the pile piers, jacking through the jacks to enable the fan foundation to reach a specified levelness, then arranging cushion blocks and wedge-shaped steel plates on the fan foundation to enable the cushion blocks and the wedge-shaped steel plates to be symmetrically removed from the pile piers after the cushion blocks stably support the fan foundation, then planting ribs below the fan foundation and binding with main ribs of the pile piers, carrying out secondary grouting of fine aggregate concrete, carrying out dry and hard fine aggregate concrete slurry twisting treatment, finally backfilling the working pit, recovering the ground, and completing jacking and rectifying of the fan foundation.
As an improvement of the technical solution, as shown in fig. 1, in step 2, the pier 3 is an enlarged head pier, which can increase the bearing capacity of the pier and reduce the pile length.
As an improvement of the technical scheme, as shown in fig. 1, in step 4, steel plates for jacking are arranged above and below the jack and used for dispersing load and avoiding local cracking of the structure.
As an improvement of the technical scheme, in the step 5, the jack jacks the fan foundation at a constant speed, and the jacking speed is less than 3 mm/min.
As an improvement of the technical solution, as shown in fig. 1 and 2, in step 5, the levelness of the fan foundation is obtained by a level detection device arranged on the foundation ring 2 above the fan foundation.
As an improvement of the technical scheme, in the step 5, if the resistance value change exceeds a preset threshold value, the jacking is finished in advance, the circumferential working surface is expanded inwards below the fan foundation, then, according to the steps 2 to 4, the pile pier and the jack are additionally arranged on the inner side of the original pile pier, and then, the step 5 is continuously executed.
As an improvement of the technical scheme, as shown in fig. 3 and 4, in step 6, the cushion blocks arranged at the top of the pile comprise a large cushion block 12 and a small cushion block 11, wherein the large cushion block 12 is arranged in the middle above the pile, and the small cushion blocks 11 are arranged at intervals around the large cushion block 12.
As the improvement of the technical scheme, in the step 7, a gap of 50-100 mm is reserved between the secondary fine aggregate concrete grouting layer and the bottom surface of the fan foundation and is used for arranging a dry and hard fine aggregate concrete twisting layer.
As an improvement of the technical scheme, the level measuring device on the foundation ring and the resistance value monitoring device of the strain gauge are both connected with a controller for controlling the lifting of the jack, so that the controller can directly obtain the levelness detected by the level detecting device and the resistance value of the strain gauge, and the working state (such as lifting and stopping) of the jack is controlled according to a preset rule by utilizing the levelness and the resistance value.
The embodiments of the present invention have been written in a progressive manner with emphasis placed on the differences between the various embodiments, and similar elements may be found in relation to each other.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (8)

1. The jacking and rectifying method of the fan foundation is characterized by comprising the following steps:
step 1: excavating a working pit around the fan foundation with uneven settlement, and forming a circumferential working surface below the fan foundation so as to facilitate construction by constructors;
step 2: excavating pile pier holes on the circumferential working surface at intervals, and meeting the depth requirement of a foundation bearing layer;
and step 3: after the pile pier hole is formed, a bound reinforcement cage is put in and concrete is poured to form a pile pier, wherein the top surface of the pile pier is higher than a working surface, the reinforcement cage comprises a pile pier main reinforcement and a pile pier stirrup, the pile pier main reinforcement is higher than the top surface of the pile pier, and a connecting space is reserved between the top surface of the pile pier and the fan foundation;
and 4, step 4: after the concrete strength of the pile pier meets the requirement, at least one group of jacks is symmetrically arranged above each pile pier, and strain gauges are uniformly adhered to the top surface of the fan foundation and used for monitoring whether the fan foundation cracks or not;
and 5: jacking the deposition side of the fan foundation through the jack until the fan foundation reaches a specified levelness, wherein in the jacking process of the jack, continuously observing the resistance value change of the strain gauge, and if the resistance value change exceeds a preset threshold value, finishing jacking in advance;
step 6: when the wind turbine foundation reaches the specified levelness, the jack stops jacking, then a cushion block is arranged at the top of each pile pier, a wedge-shaped steel plate is stuffed between the cushion block and the bottom surface of the wind turbine foundation to realize stable support of the wind turbine foundation, then the jack on each pile pier is symmetrically removed until the jack is completely removed, wherein in the process of removing the jack, the resistance value change of the strain gauge and the levelness change of the wind turbine foundation are continuously observed, if the change exceeds a threshold value, the removal of the jack is finished in advance, and the removal is continued after adjustment;
and 7: drilling a hole below the fan foundation, inserting a fan foundation embedded bar into the hole and filling a bar planting adhesive, wherein the fan foundation embedded bar corresponds to the pile pier main bar higher than the top surface of the pile pier one by one, after the bar planting adhesive is solidified, binding the pile pier main bar and the fan foundation embedded bar, arranging a hoop bar, watering and wetting the top surface of the pile pier, erecting a template, and pouring concrete to form a fine aggregate concrete secondary grouting layer, wherein a gap is reserved between the fine aggregate concrete secondary grouting layer and the bottom surface of the fan foundation, after the strength of the fine aggregate concrete secondary grouting layer meets the requirement, watering and wetting the bottom surface of the fan foundation, and performing mortar twisting treatment by using dry and hard fine aggregate concrete to form a dry and hard fine aggregate concrete mortar twisting layer;
and 8: backfilling the working pit and recovering the ground;
and 5, if the resistance value change exceeds a preset threshold value, finishing jacking in advance, expanding a circumferential working surface in the lower direction of the fan foundation, then additionally arranging a pile pier and a jack on the inner side of the original pile pier according to the steps 2 to 4, and then continuously executing the step 5.
2. The jacking and rectifying method for the wind turbine foundation as claimed in claim 1, wherein: in the step 2, the pile pier is an expanded-head pile pier, so that the bearing capacity of the pile pier is increased, and the pile length is reduced.
3. The jacking and rectifying method for the wind turbine foundation as claimed in claim 1, wherein: and 4, arranging steel plates for jacking on the upper part and the lower part of the jack, dispersing load and avoiding local cracking of the structure.
4. The jacking and rectifying method for the wind turbine foundation as claimed in claim 1, wherein: and 5, jacking the fan foundation by the jack at a constant speed, wherein the jacking speed is less than 3 mm/min.
5. The jacking and rectifying method for the wind turbine foundation as claimed in claim 1, wherein: in the step 5, the levelness of the fan foundation is obtained through a horizontal detection device arranged on a foundation ring above the fan foundation.
6. The jacking and rectifying method for the wind turbine foundation as claimed in claim 1, wherein: and 6, arranging cushion blocks at the tops of the pile piers, wherein the cushion blocks comprise large cushion blocks and small cushion blocks, the large cushion blocks are arranged in the middle above the pile piers, and the small cushion blocks are multiple and are arranged at intervals around the large cushion blocks.
7. The jacking and rectifying method for the wind turbine foundation as claimed in claim 1, wherein: in the step 7, a gap of 50-100 mm is reserved between the fine aggregate concrete secondary grouting layer and the bottom surface of the fan foundation.
8. The jacking and rectifying method for the wind turbine foundation according to claim 5, wherein: and the horizontal measuring device on the foundation ring and the resistance value monitoring device of the strain gauge are connected with a controller for controlling the lifting of the jack.
CN201910583433.7A 2019-07-01 2019-07-01 Jacking and inclination correcting method for fan foundation Active CN110258679B (en)

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Application Number Priority Date Filing Date Title
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CN110258679B true CN110258679B (en) 2021-05-18

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Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3002126B2 (en) * 1995-11-24 2000-01-24 三井建設株式会社 Temporary receiving method for structures
US8720139B2 (en) * 2012-03-30 2014-05-13 Allan P. Henderson Cementitious foundation cap with post-tensioned helical anchors
CN109680737B (en) * 2017-10-18 2021-05-07 中车株洲电力机车研究所有限公司 Foundation deviation correction construction method for wind generating set
CN207739297U (en) * 2017-11-27 2018-08-17 广东中青建筑科技有限公司 A kind of strengthening of foundation error-correction structure
CN108643255A (en) * 2018-05-24 2018-10-12 山东建筑大学 Frame structure building lifting inclination-correcting method
CN109056859A (en) * 2018-09-11 2018-12-21 中国电建集团华东勘测设计研究院有限公司 A kind of tubular type slip casting blower foundation method for correcting error
CN109797787A (en) * 2019-03-06 2019-05-24 中国电建集团北京勘测设计研究院有限公司 A kind of levelling device adjusting the relative settlement of runtime wind driven generator base

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