CN114059605A - Power tower foundation settlement grouting repair method - Google Patents
Power tower foundation settlement grouting repair method Download PDFInfo
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- CN114059605A CN114059605A CN202010761604.3A CN202010761604A CN114059605A CN 114059605 A CN114059605 A CN 114059605A CN 202010761604 A CN202010761604 A CN 202010761604A CN 114059605 A CN114059605 A CN 114059605A
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- Prior art keywords
- grouting
- power tower
- soil
- foundation
- explosive
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D35/00—Straightening, lifting, or lowering of foundation structures or of constructions erected on foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
A settlement grouting repair method for a foundation of an electric power tower comprises the following steps: s1, pre-packaging the calculated explosive with safe dosage into an explosive package for later use; s2, drilling holes downwards obliquely from a plurality of different directions of the ground position of the power tower foundation by using the drilling device, enabling the bottom ends of the holes to be positioned right below the power tower foundation, and taking out the drilling device; s3, placing explosive bags into different positions in the drill hole, blasting, wherein the explosive sources expand and explode to generate continuous explosion shock waves, so that the soil can be loosened and broken properly in a large range; and s4, inserting the grouting pipe into the fluffy soil after blasting, grouting, and reinforcing and repairing the soil layer of the power tower foundation after the grout is hardened to prevent the foundation from continuously settling. The invention adopts the micro-explosion method to blast the soil, so that the soil is fully loosened and broken, the grouting range of each time is improved, the grouting times are reduced, the method is convenient and quick, and the time cost is saved.
Description
Technical Field
The invention relates to the technical field of power tower construction, in particular to a method for repairing foundation settlement of a power tower through grouting.
Background
The stable structure of electric power tower basis is the prerequisite of guaranteeing electric power tower normal use, and after electric power tower basis appeared subsiding, light then electric power tower slope, and the power tower that leads to the weight of results in collapses, can cause the loss that increases for electric power system, therefore in time restore after electric power tower basis appeared subsiding and just seem to be especially important. Because the foundation of the power tower has higher requirements on settlement control, large-scale excavation treatment is difficult to carry out after the foundation of the power tower is settled, and a good effect can be obtained by repairing the settlement part of the power tower by using a grouting technology.
Common slip casting technique carries out fracturing slip casting in the soil layer to subsiding the position through the pipe, but the soil horizon of electric power tower basis is because the weight of electric power tower self to and the stickness effect of soil horizon self, when adopting fracturing slip casting, the diameter range of the fracturing in soil is little, does not exceed 50cm, and it is little to lead to the slip casting scope at every turn, and the slip casting effect is poor, needs to increase the slip casting number of times, and it is longer to consume time simultaneously.
Disclosure of Invention
The invention provides a settlement grouting repair method for a power tower foundation, which adopts a micro-explosion method to blast soil, so that the soil is sufficiently loosened and broken, the grouting range of each time is enlarged, the grouting times are reduced, the method is convenient and rapid, and the time cost is saved. The technical scheme of the invention is as follows:
a settlement grouting repair method for a foundation of an electric power tower comprises the following steps: s1, pre-packaging the calculated explosive with safe dosage into an explosive package for later use; s2, drilling holes downwards obliquely from a plurality of different directions of the ground position of the power tower foundation by using the drilling device, enabling the bottom ends of the holes to be positioned right below the power tower foundation, and taking out the drilling device; s3, placing explosive bags into different positions in the drill hole, blasting, wherein the explosive sources expand and explode to generate continuous explosion shock waves, so that the soil can be loosened and broken properly in a large range; and s4, inserting the grouting pipe into the fluffy soil after blasting, grouting, and reinforcing and repairing the soil layer of the power tower foundation after the grout is hardened to prevent the foundation from continuously settling.
The drilling device comprises a drill bit and a drill rod.
The grouting pipe is connected with a high-pressure grouting spray head.
Compared with the prior art, the invention has the beneficial effects that:
according to the settlement grouting repair method for the power tower foundation, provided by the invention, the soil is blasted by adopting a micro-explosion method, so that the soil is sufficiently loosened and broken, the grouting range of each time is enlarged, the grouting times are reduced, the convenience and the rapidness are realized, and the time cost is saved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is to be noted that, in the present invention, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention, but do not indicate or imply that the referred devices or elements must have the specific orientations, be configured to operate in the specific orientations, and thus are not to be construed as limitations of the present invention.
The present invention will be described in detail with reference to specific embodiments thereof.
The foundation of the power tower needs to be repaired after being settled, a grouting method is a commonly used method, but the traditional fracturing grouting method has small fracturing radius in soil, so that the grouting range is small, the grouting effect is poor, the grouting times need to be increased, and the time consumption is long. Therefore, it is necessary to enlarge the fracture radius of the soil or the gap of the soil to increase the grouting range.
As shown in fig. 1, a power tower foundation structure, including supporting the cushion cap 1 of installing whole power tower, it has gap 3 to distribute in the soil layer 2 of cushion cap 1 below, it has solidification cement, and cement and soil solidification are as an organic whole to fill in the gap 3. Namely, cement slurry is injected into the soil layer 2 below the bearing platform 1, and after the cement slurry is hardened, the bearing capacity and stability of the soil layer below the bearing platform are improved, so that the settlement of the foundation structure of the power tower is reduced or avoided in the subsequent use of the power tower.
The bearing platform 1 is a concrete pouring bearing platform.
The angle steel fixing piece 4 for installing the tower foot 6 (or the tower leg) is arranged on the bearing platform 1, and the angle steel fixing piece 4 is detachably connected with the bearing platform 1 through an anchor rod connecting piece 5 which is prefabricated and poured in the bearing platform 1.
The cement slurry can be injected into the soil layer below the bearing platform by adopting a fracturing grouting method or an explosion grouting method.
When an explosion grouting method is adopted, the method comprises the following steps: s1, pre-packaging the calculated safe explosive into explosive bags for standby use, or using non-explosive explosion sources; s2, drilling holes downwards obliquely from a plurality of different directions of the ground position of the power tower foundation by using the drilling device, enabling the bottom ends of the holes to be positioned right below the power tower foundation, and taking out the drilling device (the drilling depth can be the same or different); s3, placing the packaged explosive bags into different positions in the drill holes (when viewed from the vertical direction, the explosives are placed into different depths, and the corresponding number of explosive bags required by design are placed on the same horizontal plane where each drill hole is located), blasting the soil sections, wherein the explosive sources expand and explode to generate continuous explosion shock waves, so that the soil is properly loosened and broken in a large range; s4, inserting the grouting pipe into the fluffy soil after blasting, injecting cement paste, pulling out the injection pipe in stages in the process of injecting the cement paste to enable the cement paste in each injection area to reach the design strength, pulling out the grouting pipe after the cement paste injection is finished, and enabling the soil layer to reach the corresponding design strength after the cement paste is hardened.
The soil is loosened and cracked under the action of the explosive, and the process is as follows:
blasting explosive, wherein the blasting shock wave impacts the outer wall of the blasting cavity to enable the outer wall soil to move outwards and press the peripheral soil to form shock waves in the soil; under the action of the shock wave, an explosion cavity is formed firstly, so that the surrounding soil is torn or crushed; the explosion cavity is continuously expanded, the pressure in the cavity is reduced, the soil moves outwards and is blocked by the soil on the outer side, the moving speed is reduced, and when the pressure in the soil is greater than the pressure on the wall of the cavity, the stress direction of the soil unit body faces the cavity, so that the soil moves in a deceleration and reverse direction, and radial tensile stress is generated. The loose soil around the cavity moves to the center of the cavity, and the loose soil around the cavity moves to the center of the cavity, so that radial cracks (tensile cracks), shearing cracks, annular cracks and original cracks in the soil are promoted to be expanded to form a crack ring.
The explosive is exploded in the soil, and the radius of an explosion cavity is related to the physical property of the soil, the type of the explosive used, the charging depth and other parameters. The radius of the cavity formed by explosion in the soil body is in direct proportion to the charging radius of the explosive package; the test result shows that the influence radius (fracture radius) of the explosion effect on the soil body is 4-6 times of the radius of the explosion cavity.
It should be noted that in order to prevent personnel injury and damage to surrounding buildings, the amount of charge in the charge and the safe distance of the blast wave are calculated and overdosing is prohibited.
The reference calculation formula is as follows:
(1) safe distance R (m)
R＝(k/v)1/αQ1/3
(2) Calculating the velocity v (cm/s)
v＝k(Q1/3/R)α
(3) Allowable safe dose Q (kg)
Q＝R3v3/α/k3/α
In the formula: k. the alpha-coefficient related to the blasting site and the terrain needs to be selected according to actual conditions.
v-safe allowable vibration speed, cm/s
Q-charge, kg
When drilling, the drilling can not be carried out along the direction vertical to the horizontal plane of the foundation, namely, the drilling can be carried out on the power tower foundation along the vertical direction. The electric power tower foundation is drilled along the vertical direction, so that the construction is inconvenient on one hand, and the electric power tower foundation can be damaged secondarily in the drilling process on the other hand.
When the power tower foundation is drilled along the horizontal direction, a cross section needs to be excavated around the power tower foundation, and then soil below the power tower foundation is drilled along the horizontal direction from the position of the cross section, so that the mode has the disadvantages of large workload and long time consumption. Therefore, the mode of drilling holes obliquely downwards from the ground position of the power tower foundation is adopted, and the trouble caused by the two modes can be well avoided.
The drilling device comprises a drill bit and a drill rod.
The grouting pipe is connected with a high-pressure grouting spray head. The grouting pipe injects cement slurry into surrounding soil through a grouting pump, and is also provided with a grouting valve which can control the flow of the slurry.
According to the settlement grouting repair method for the power tower foundation, provided by the invention, the soil is blasted by adopting a micro-explosion method, so that the soil is sufficiently loosened and broken, the grouting range of each time is enlarged, the grouting times are reduced, the convenience and the rapidness are realized, and the time cost is saved.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. The method for repairing the foundation settlement and grouting of the power tower is characterized by comprising the following steps: s1, pre-packaging the calculated explosive with safe dosage into an explosive package for later use; s2, drilling holes downwards obliquely from a plurality of different directions of the ground position of the power tower foundation by using the drilling device, enabling the bottom ends of the holes to be positioned right below the power tower foundation, and taking out the drilling device; s3, placing explosive bags into different positions in the drill hole, blasting, wherein the explosive sources expand and explode to generate continuous explosion shock waves, so that the soil can be loosened and broken properly in a large range; and s4, inserting the grouting pipe into the fluffy soil after blasting, grouting, and reinforcing and repairing the soil layer of the power tower foundation after the grout is hardened to prevent the foundation from continuously settling.
2. The electric power tower foundation settlement grouting repair method of claim 1, characterized in that: the drilling device comprises a drill bit and a drill rod.
3. The electric power tower foundation settlement grouting repair method of claim 1, characterized in that: the grouting pipe is connected with a high-pressure grouting spray head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010761604.3A CN114059605A (en) | 2020-07-31 | 2020-07-31 | Power tower foundation settlement grouting repair method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010761604.3A CN114059605A (en) | 2020-07-31 | 2020-07-31 | Power tower foundation settlement grouting repair method |
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| Publication Number | Publication Date |
|---|---|
| CN114059605A true CN114059605A (en) | 2022-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010761604.3A Pending CN114059605A (en) | 2020-07-31 | 2020-07-31 | Power tower foundation settlement grouting repair method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3222872A (en) * | 1960-05-05 | 1965-12-14 | Nitroglycerin Ab | Method of strengthening and sealing rock |
| CN102878874A (en) * | 2012-10-09 | 2013-01-16 | 北京科技大学 | Deep-hole pre-splitting blasting grouting method |
| CN106761852A (en) * | 2017-03-24 | 2017-05-31 | 中国矿业大学 | Wide area coal petrography deep hole pressure-bearing microexplosion grouting water blocking method under water |
| CN107268596A (en) * | 2016-04-09 | 2017-10-20 | 河南城建学院 | Star basis and its construction method |
| CN110453673A (en) * | 2019-09-03 | 2019-11-15 | 机械工业勘察设计研究院有限公司 | A kind of pier foundation ruggedized construction and method |
-
2020
- 2020-07-31 CN CN202010761604.3A patent/CN114059605A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3222872A (en) * | 1960-05-05 | 1965-12-14 | Nitroglycerin Ab | Method of strengthening and sealing rock |
| CN102878874A (en) * | 2012-10-09 | 2013-01-16 | 北京科技大学 | Deep-hole pre-splitting blasting grouting method |
| CN107268596A (en) * | 2016-04-09 | 2017-10-20 | 河南城建学院 | Star basis and its construction method |
| CN106761852A (en) * | 2017-03-24 | 2017-05-31 | 中国矿业大学 | Wide area coal petrography deep hole pressure-bearing microexplosion grouting water blocking method under water |
| CN110453673A (en) * | 2019-09-03 | 2019-11-15 | 机械工业勘察设计研究院有限公司 | A kind of pier foundation ruggedized construction and method |
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