CN114457837A - Tower footing construction method for high-voltage power transmission and transformation project - Google Patents
Tower footing construction method for high-voltage power transmission and transformation project Download PDFInfo
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- CN114457837A CN114457837A CN202210140898.7A CN202210140898A CN114457837A CN 114457837 A CN114457837 A CN 114457837A CN 202210140898 A CN202210140898 A CN 202210140898A CN 114457837 A CN114457837 A CN 114457837A
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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
- E02D27/42—Foundations for poles, masts or chimneys
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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Abstract
The invention relates to the field of electric tower bases and discloses a tower base construction method for high-voltage power transmission and transformation engineering, which comprises the steps of cleaning a construction field area, excavating a foundation, manufacturing and installing reinforcing steel bars, constructing concrete and pouring and air-drying, wherein in the field cleaning process, all obstacles in the pile foundation range need to be cleaned, before an iron tower foundation pit is excavated, according to a line central pile and a foundation pit central pile which are determined during pit division, when the foundation pit is excavated to about a preset depth, a measuring tape or a measuring rod is used for repeatedly measuring the pit depth, and a cement sand-wrapped method is adopted for stirring and mixing when concrete is stirred, so that a material production coefficient and a utilization coefficient of a stirring cylinder are produced when concrete raw materials are stirred and mixed, so that the inner part of the stirring cylinder is sufficiently stirred, the uniformity of concrete mixing is improved.
Description
Technical Field
The invention relates to the technical field of electric tower bases, in particular to a tower base construction method for high-voltage power transmission and transformation engineering.
Background
The electric tower is a tower-shaped building with a trapezoid or triangle shape, the height of the tower-shaped building is usually 25-40 meters, and the tower-shaped building is of a steel frame structure. The electric tower is mostly built near a power plant and a power distribution station in the field, is an important facility of an electric power department, and can be used for overhead electric wires and play a role in protection and support. Design, manufacture, installation, maintenance and quality detection of the electric power iron tower are important guarantees for operation and development of modern electric power systems.
The tower footing of common high-voltage transmission and transformation engineering generally adopts the concrete to pour when being under construction, but generally all adopt rabbling mechanism to carry out the single stirring of disposable reinforced between the raw materials of general concrete, this kind of mode can make the inside of rabbling mechanism not have abundant space to mix, and then influence the homogeneity of concrete mixing, thereby the intensity of concrete has been reduced, the tower footing of messenger takes place to split when using for a long time, phenomenons such as sediment, the support intensity of tower footing to the electricity tower has been reduced, can not satisfy the operating requirement of the tower footing of high-voltage transmission and transformation engineering, provide a tower footing construction method for high-voltage transmission and transformation engineering for this.
Disclosure of Invention
The technical problem to be solved by the invention is
Aiming at the defects of the prior art, the invention provides a tower footing construction method for high-voltage power transmission and transformation engineering, so as to solve the problems in the background technology.
The technical scheme of the invention is as follows:
a tower footing construction method for high-voltage power transmission and transformation engineering comprises the following steps:
s1, cleaning the construction site:
carrying out rubble cleaning and soil pile or soil pit filling operation on the land to be constructed, removing the tree branches and weeds in the field, and finally paving a transportation road and a construction road in the construction field;
s2, foundation excavation:
determining the position of a central pile according to a construction drawing, digging a foundation pit at the position of the central pile, fixing the central pile in the foundation pit, and finally respectively determining 8 auxiliary piles according to the central pile, wherein the auxiliary piles are in a shape of a Chinese character 'jing';
s3, selecting reinforcing steel bars and mixing with concrete:
selecting a proper type of steel bar according to construction requirements, screening concrete raw materials including cement, river sand and stones, and conveying a stirring mechanism to a construction site to stir the raw materials in proportion by adopting a cement sand-coating method;
s4, pouring and air drying:
and pouring the mixed concrete into the foundation pit immediately, determining the pouring height of the concrete according to requirements, air-drying the poured concrete, and pulling the warning line warning device.
Preferably, in the field cleaning process, all obstacles in the range of the pile foundation need to be cleaned, so that the drilling of the drilling machine can be smoothly carried out, roads in the construction site need to be paved, so that the material transportation during construction can be met, all lines need to be retested for the second time before the construction, the phenomena of deflection and unevenness during the construction of the tower foundation are prevented, and the quality of the electric tower construction is improved.
Preferably, before the iron tower foundation pit is excavated, 8 auxiliary piles are respectively determined according to the line center pile and the foundation pit center pile determined during pit division, the auxiliary pile leads are utilized to enable the auxiliary piles to be in a shape like a Chinese character 'jing', the intersection point of the shape like the Chinese character 'jing' is the center point of the iron tower foundation pit, the accuracy of the tower foundation construction position is improved, and the follow-up electric tower construction position is prevented from generating large errors.
Preferably, after the center point of the foundation pit is determined, secondary verification is carried out on the foundation pit, under the condition that the verification is correct, 8 paving-assisting piles are protected by using warning lines or railings, the situation that the foundation pit shakes and moves due to collision in subsequent construction is avoided, then according to the size shown in a basic diagram, the pit opening line is marked by taking the center pile of the foundation pit as the center to carry out manual excavation, and the firmness and the quality of tower foundation construction are improved.
Preferably, when digging the predetermined degree of depth at the foundation ditch, carry out measurement repeatedly to the hole depth with tape measure or measuring staff to guarantee that the hole depth is in reasonable error range, meet the stone ore and need take out it when the in-process of digging, and bury the soil pit of leaving over, need use grit, earth to make level the foundation ditch bottom after digging the specified degree of depth, promoted the stability of the follow-up construction of column foot.
Preferably, the steel bars are subjected to a tensile test before use, are firmly installed according to the designed quantity and mode during installation, and are in the concrete raw materials;
cement: adopting silicate cement;
river sand: selecting the species with the average particle diameter of 0.3;
stone: the species having an average particle diameter of between 20mm were selected.
The quality of the mixed concrete is improved.
Preferably, after the concrete raw material is selected, the concrete raw material is stirred and mixed, and the discharge capacity, the feeding capacity and the geometric capacity of the concrete raw material need to be controlled in real time during stirring;
wherein the ratio of the discharge capacity to the feed capacity is called as discharge coefficient and needs to be controlled at 0.60;
the ratio of the feeding capacity to the geometric capacity is called the utilization coefficient of the mixing drum, and needs to be controlled to be 0.20, so that the uniformity of the concrete during mixing is improved, and the mixing efficiency of the concrete is improved.
Preferably, when the concrete is stirred, a cement sand wrapping method is adopted for stirring and mixing, a certain amount of water is firstly added to wet the surface of river sand, then stones are added and mixed with wet sand uniformly, then all cement is put into and mixed with the sand to form a cement paste shell with a low cement-cement ratio on the surface of the sand, and finally the rest water and additives are added and stirred, wherein the dosage ratio of the water, the cement, the river sand and the stones is 0.51:1:1.81:3.68, and the strength of the concrete after mixing is improved.
Preferably, the concrete method during pouring is as follows;
a. before pouring, checking the condition of the template, the connection strength of the steel bars and the clearance between the steel bars and the template according to a design drawing;
b. removing accumulated water in the foundation pit, and binding the screw thread part of the foundation bolt;
c. when pouring is carried out, the phenomenon of slurry leakage of the template is ensured, and when concrete is poured from a high position, the natural pouring height of the concrete is not more than 2 meters;
d. when the thickness of the concrete is 300mm, the concrete is tamped once by using a vibrating rod, a diaphragm is paved on the surface of the concrete after the pouring is finished, and protective railings or warning lines are covered around the concrete to enable the concrete to be naturally air-dried, so that the pouring quality of the concrete of the tower footing is improved, and the cracking phenomenon in subsequent use is prevented.
The invention has the advantages that;
this a column foot construction method for high pressure transmission and transformation engineering, through the utilization coefficient of control material coefficient and churn when stirring the concrete raw materials and mixing for there is abundant space in the churn to mix, has promoted the homogeneity of concrete mixing, and the cement of adoption wraps up the sand method and stirs the mixture, has promoted the intensity of concrete, makes it be difficult to take place the phenomenon of segregation and bleeding, has prevented to take place the phenomenon of fracture and falling the sediment at the column foot after last time using.
Drawings
FIG. 1 is a main flow diagram of the present invention;
FIG. 2 is a flow chart of the present invention for reinforcing bar fabrication and installation and concrete construction;
fig. 3 is a flow chart of the pouring and air drying of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments 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.
Example one
The invention provides a technical scheme, and discloses a tower footing construction method for high-voltage power transmission and transformation engineering, which comprises the following steps:
s1, cleaning the construction site:
during cleaning, the construction field must be ensured to be flat, the measurement positioning paying-off and pile foundation construction requirements are met, during on-site cleaning, all obstacles in the pile foundation range must be cleaned, so that drilling by a drilling machine can be smoothly carried out, roads in the construction field should be paved to meet material transportation during construction, and all lines must be retested for the second time before operation;
s2, foundation excavation:
before foundation excavation, the position of a center pile is determined according to a construction drawing, a foundation pit is excavated at the position of the center pile, before an iron tower foundation pit is excavated, 8 auxiliary piles are respectively determined according to a line center pile and a foundation pit center pile determined during pit division, the auxiliary piles are led to form a shape like a Chinese character 'jing', the intersection point of the shape like the Chinese character 'jing' is the center point of the iron tower foundation pit, after the center point of the foundation pit is determined, secondary verification is carried out on the center point of the foundation pit, under the condition that the verification is correct, 8 paving auxiliary piles are protected by using a warning line or a railing to avoid the situation that the foundation pit shakes and moves due to collision in subsequent construction, then manual excavation is carried out by marking a pit opening line by using the foundation pit center pile as the center according to the size shown by a foundation map, when the foundation pit is excavated to the preset depth, a measuring tape or a measuring rod is used for repeatedly measuring the pit depth so as to ensure that the pit depth is within a reasonable error range, when the excavation is carried out, the ores such as stones and the like need to be taken out, the left soil pit needs to be buried, and when the excavation is carried out to a specified depth, gravels, soil and the like need to be used for leveling the bottom of the foundation pit;
s3, selecting reinforcing steel bars and mixing with concrete:
selecting a proper type of steel bar according to construction requirements, mixing and stirring raw materials of concrete, including cement, river sand and stones for multiple times, performing a tensile test on the steel bar before use, and firmly installing the steel bar in the concrete raw materials according to the designed quantity and mode during installation;
cement: adopting silicate cement;
river sand: selecting the type with the average particle diameter not less than 0.3 mm;
stone: selecting the type with the average particle diameter of 20 mm;
after the concrete raw materials are selected, stirring and mixing the concrete raw materials, wherein the discharge capacity, the feeding capacity and the geometric capacity of the concrete raw materials need to be controlled in real time during stirring;
wherein the ratio of the discharge capacity to the feed capacity is called as discharge coefficient and needs to be controlled at 0.60;
wherein the ratio of the feeding capacity to the geometric capacity is called as the utilization coefficient of the mixing drum and needs to be controlled between 0.20;
the concrete is stirred and mixed by adopting a cement sand-wrapping method, a certain amount of water is firstly added to wet the surface of river sand, then stones are added and mixed with wet sand to be uniform, then all cement is put into sand and mixed together to form a cement paste shell with low water-cement ratio on the surface of the sand, finally the rest water and additives are added and stirred, and the dosage ratio of the water, the cement, the river sand and the stones is 0.51:1:1.81: 3.68.
S4, pouring and air drying:
pouring the mixed concrete immediately, wherein the concrete method for pouring is divided into;
a. before pouring, checking the condition of the template, the connection strength of the steel bars and the clearance between the steel bars and the template according to a design drawing;
b. draining accumulated water in the foundation pit, and binding the screw thread part of the foundation bolt;
c. when pouring is carried out, the phenomenon of slurry leakage of the template is ensured, and when concrete is poured from a high position, the natural pouring height of the concrete is not more than 2 meters;
d. in the pouring process, a vibrating rod is adopted to carry out primary tamping every time the thickness of the material is poured to be 300 mm; and after the pouring is finished, laying a diaphragm on the surface of the concrete, and covering a protective railing or a warning line around the diaphragm to enable the concrete to be naturally air-dried.
Example two
The difference from the first embodiment is that:
s3, selecting reinforcing steel bars and mixing with concrete:
selecting a proper type of steel bar according to construction requirements, mixing and stirring raw materials of concrete, including cement, river sand and stones for multiple times, performing a tensile test on the steel bar before use, and firmly installing the steel bar in the concrete raw materials according to the designed quantity and mode during installation;
cement: adopting silicate cement;
river sand: selecting the type with the average particle diameter of 0.4 mm;
stone: the species having an average particle diameter of between 30mm were selected.
After the concrete raw materials are selected, stirring and mixing the concrete raw materials, wherein the discharge capacity, the feeding capacity and the geometric capacity of the concrete raw materials need to be controlled in real time during stirring;
wherein the ratio of the discharge capacity to the feed capacity is called as discharge coefficient and needs to be controlled at 0.70;
the ratio between the feeding capacity and the geometric capacity is called the utilization coefficient of the mixing drum and is controlled to be between 0.30.
EXAMPLE III
The differences from the first and second embodiments are:
s3, selecting reinforcing steel bars and mixing with concrete:
selecting a proper type of steel bar according to construction requirements, mixing and stirring raw materials of concrete, including cement, river sand and stones for multiple times, performing a tensile test on the steel bar before use, and firmly installing the steel bar in the concrete raw materials according to the designed quantity and mode during installation;
cement: adopting silicate cement;
river sand: selecting the type with the average particle diameter of 0.5 mm;
stone: the species having an average particle diameter of between 40mm were selected.
After the concrete raw materials are selected, stirring and mixing the concrete raw materials, wherein the discharge capacity, the feeding capacity and the geometric capacity of the concrete raw materials need to be controlled in real time during stirring;
wherein the ratio of the discharge capacity to the feed capacity is called as discharge coefficient and needs to be controlled at 0.80;
the ratio between the feeding capacity and the geometric capacity is called the utilization coefficient of the mixing drum and is controlled to be between 0.40.
The working principle of the device is as follows: firstly, cleaning a construction field area, then carrying out reinforcing steel bar manufacturing and installation and concrete manufacturing according to a line center pile and a foundation pit center pile determined during pit division, selecting cement, river sand and stones as raw materials, controlling a discharge coefficient to be 0.60-0.70, usually 0.67 and a utilization coefficient of a mixing drum to be 0.22-0.40, carrying out mixing and stirring by a cement sand-wrapping method, and finally pouring the interior of a tower foundation, wherein the pouring process is divided into the following steps;
a. before pouring, checking the condition of the template, the connection strength of the steel bars and the clearance between the steel bars and the template according to a design drawing;
b. removing accumulated water in the foundation pit, and binding the screw thread part of the foundation bolt;
c. when pouring is carried out, the phenomenon that the template leaks slurry is ensured, and when concrete is poured from a high position, the natural pouring height of the concrete should not exceed 2 meters;
d. in the pouring process, a vibrating rod is adopted to carry out primary tamping on the concrete when the thickness of the concrete is 300 mm;
and after the pouring is finished, laying a diaphragm on the surface of the concrete, and covering a protective railing or a warning line around the diaphragm to enable the concrete to be naturally air-dried.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A tower footing construction method for high-voltage power transmission and transformation engineering is characterized by comprising the following steps: the method comprises the following steps:
s1, cleaning the construction site:
carrying out rubble cleaning and soil pile or soil pit filling operation on the land to be constructed, removing the tree branches and weeds in the field, and finally paving a transportation road and a construction road in the construction field;
s2, foundation excavation:
determining the position of a central pile according to a construction drawing, digging a foundation pit at the position of the central pile, fixing the central pile in the foundation pit, and finally respectively determining 8 auxiliary piles according to the central pile, wherein the auxiliary piles are in a shape of a Chinese character 'jing';
s3, selecting reinforcing steel bars and mixing with concrete:
selecting a proper type of steel bar according to construction requirements, screening concrete raw materials including cement, river sand and stones, and conveying a stirring mechanism to a construction site to stir the raw materials in proportion by adopting a cement sand-coating method;
s4, pouring and air drying:
and pouring the mixed concrete into the foundation pit immediately, determining the pouring height of the concrete according to requirements, air-drying the poured concrete, and pulling the warning line warning device.
2. The tower footing construction method for high-voltage power transmission and transformation engineering according to claim 1, wherein the method comprises the following steps: in the field cleaning process, all obstacles in the range of the pile foundation need to be cleaned, the road in the field is paved in the construction field, and all lines need to be retested for the second time before the operation.
3. The tower footing construction method for high-voltage power transmission and transformation engineering according to claim 1, wherein the method comprises the following steps: before the iron tower foundation pit is excavated, 8 auxiliary piles are respectively determined according to the line central pile and the foundation pit central pile determined during pit division, the auxiliary piles are led to be in a shape like a Chinese character 'jing', and the intersection point of the Chinese character 'jing' is the center point of the iron tower foundation pit.
4. The tower footing construction method for high-voltage power transmission and transformation engineering according to claim 3, wherein: after the position of the center pile is determined, secondary verification is carried out on the center pile, under the condition that the verification is correct, 8 paving-assisting piles are protected by using warning lines or railings, and then according to the size shown in a basic diagram, a pit opening line is marked by taking the center pile of the foundation pit as the center for manual excavation.
5. The tower footing construction method for high-voltage power transmission and transformation engineering according to claim 1, wherein the method comprises the following steps: when digging the predetermined degree of depth at the foundation ditch, carry out the measurement that relapses with tape measure or measuring arm to the hole depth, meet the stone ore and need take out it when the in-process of digging to bury the soil hole of leaving over, need make level to the foundation ditch bottom with grit, earth after digging specified degree of depth.
6. The tower footing construction method for high-voltage power transmission and transformation engineering according to claim 1, wherein the method comprises the following steps: the used steel bars are subjected to a tensile test before use, are firmly installed according to the designed quantity and mode during installation, and are in concrete raw materials;
cement: adopting silicate cement;
river sand: selecting the type with the average particle diameter of 0.3-0.5 mm;
stone: the average particle diameter is selected from 20-40 mm.
7. The tower footing construction method for high-voltage power transmission and transformation engineering according to claim 1, wherein the method comprises the following steps: after the concrete raw materials are selected, stirring and mixing the concrete raw materials, wherein the discharge capacity, the feeding capacity and the geometric capacity of the concrete raw materials need to be controlled in real time during stirring;
wherein the ratio of the discharge capacity to the feed capacity is called as discharge coefficient and needs to be controlled at 0.60-0.80;
the ratio between the feeding capacity and the geometric capacity is called the utilization coefficient of the mixing drum and is controlled between 0.20 and 0.40.
8. The tower footing construction method for high-voltage power transmission and transformation engineering according to claim 1, wherein the method comprises the following steps: the concrete is stirred and mixed by adopting a cement sand-wrapping method, a certain amount of water is firstly added to moisten the surface of river sand, then stones are added and mixed with wet sand to be stirred uniformly, then all cement is put into the sand and mixed together with the sand to form a cement paste shell with low water-cement ratio on the surface of the sand, finally the rest water and the additive are added and stirred, and the dosage ratio of the water, the cement, the river sand and the stones is 0.51:1:1.81: 3.68.
9. The tower footing construction method for high-voltage power transmission and transformation engineering according to claim 1, wherein the method comprises the following steps: the concrete method during pouring comprises the following steps:
a. before pouring, checking the condition of the template, the connection strength of the steel bars and the clearance between the steel bars and the template according to a design drawing;
b. removing accumulated water in the foundation pit, and binding the screw thread part of the foundation bolt;
c. when pouring is carried out, the phenomenon of slurry leakage of the template is ensured, and when the concrete is poured from a high place, the natural pouring height of the concrete is not more than 2 meters;
d. in the pouring process, when the thickness of the concrete is 300mm, the concrete is tamped once by adopting a vibrating spear, a diaphragm is paved on the surface of the concrete after the pouring is finished, and protective railings or warning lines are covered around the concrete to enable the concrete to be dried naturally.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210140898.7A CN114457837A (en) | 2022-02-16 | 2022-02-16 | Tower footing construction method for high-voltage power transmission and transformation project |
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| CN202210140898.7A CN114457837A (en) | 2022-02-16 | 2022-02-16 | Tower footing construction method for high-voltage power transmission and transformation project |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002256573A (en) * | 2001-03-02 | 2002-09-11 | Chubu Electric Power Co Inc | Foundation for existing foundation reinforcing steel tower and construction method for it |
| CN108343082A (en) * | 2018-02-27 | 2018-07-31 | 国网山东省电力公司泗水县供电公司 | A kind of foundation construction method of high pressure shaft tower |
-
2022
- 2022-02-16 CN CN202210140898.7A patent/CN114457837A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002256573A (en) * | 2001-03-02 | 2002-09-11 | Chubu Electric Power Co Inc | Foundation for existing foundation reinforcing steel tower and construction method for it |
| CN108343082A (en) * | 2018-02-27 | 2018-07-31 | 国网山东省电力公司泗水县供电公司 | A kind of foundation construction method of high pressure shaft tower |
Non-Patent Citations (1)
| Title |
|---|
| 中国电力企业家协会供电分会编: "《土木工程施工（第2版）》", 武汉理工大学出版社 * |
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