CN-121992787-A - Large-volume concrete structure construction method for wind power foundation

CN121992787ACN 121992787 ACN121992787 ACN 121992787ACN-121992787-A

Abstract

The invention provides a construction method of a large-volume concrete structure of a wind power foundation, which comprises the following steps of S1, excavating a foundation pit, S2, erecting a template, constructing a support template in the foundation pit according to construction requirements, S3, reinforcing bars, bundling reinforcing bars according to construction requirements, S4, setting temperature measuring points, arranging the temperature measuring points at designed positions, embedding temperature measuring lines, S5, pouring concrete, pouring in sequence according to the good areas, measuring the temperature in real time in the pouring process, and performing temperature control and moisture preservation. The method can effectively avoid the structural cracking problem in the pouring process through strict temperature monitoring and reasonable pouring modes.

Inventors

SUN CHUNE
SONG CHENGLONG
Zong Luchao
ZHOU JIN
Su mingzhu
Xiao Saigang

Assignees

中建二局第二建筑工程有限公司

Dates

Publication Date: 20260508
Application Date: 20260226

Claims (10)

1. The construction method of the large-volume concrete structure of the wind power foundation is characterized by comprising the following steps of: s1, excavating a foundation pit, namely excavating a foundation pit required by a wind power foundation in a target place; S2, erecting a template, and erecting a support template in the foundation pit according to construction requirements; s3, reinforcing bars are arranged, and the reinforcing bars are bundled according to construction requirements; s4, setting temperature measuring points, arranging the temperature measuring points at the designed positions, and embedding temperature measuring lines; And S5, pouring concrete, namely pouring the concrete in sequence in the areas, measuring the temperature in real time in the pouring process, and controlling the temperature and keeping moisture.
2. The method according to claim 1, wherein in step S1, the foundation pit comprises a trapezoid cross-section part at the bottom and a rectangular cross-section part at the upper part, the top of the trapezoid cross-section part of the foundation pit is the same as the bottom of the rectangular cross-section part in width, and the bottom of the foundation pit is provided with a concrete cushion.
3. The method for constructing a large-volume concrete structure of a wind power foundation according to claim 2, wherein in the step S2, the outer side of the supporting template is close to the inner wall of the foundation pit, and the inner side of the supporting template is provided with a cavity in the wind power foundation.
4. The method for constructing the large-volume concrete structure of the wind power foundation according to claim 1, wherein in the step S3, the steel bars of the annular wall portion of the wind power foundation comprise a plurality of vertical bars, annular bars and longitudinal bars, the annular bars are arranged around the circumference, the longitudinal bars are arranged radially on the horizontal plane, the vertical bars are arranged vertically, the steel bars of the cantilever plate portion of the wind power foundation comprise a plurality of vertical bars, longitudinal bars and inclined bars, the steel bars of the bottom of the wind power foundation comprise two layers of mesh steel bars, and a plurality of erection steel bars are arranged between the two layers of mesh steel bars.
5. The method for constructing the large-volume concrete structure of the wind power foundation according to claim 4, wherein a reserved pipeline is arranged at the suspended part on the inner side of the annular wall of the wind power foundation, prestress ribs are arranged in the reserved pipeline and uniformly distributed in the circumferential direction of the wind power foundation at equal intervals, the prestress ribs comprise embedded steel pipes, the top ends of the embedded steel pipes are exposed out of the top ends of the annular wall of the wind power foundation, anchor backing plates are arranged at the bottom ends of the embedded steel pipes, spiral ribs are sleeved on the embedded steel pipes and connected to the anchor backing plates, the top ends of the embedded steel pipes are obliquely arranged towards the inner side of the annular wall of the wind power foundation, one side of a wedge-shaped surface of each anchor backing plate faces downwards, and the thickness of one side of each anchor backing plate, close to the inner side of the annular wall of the wind power foundation, is smaller than that of the other side.
6. The method for constructing the large-volume concrete structure of the wind power foundation according to claim 5, wherein the top surface of the wind power foundation is provided with annular top surface grooves on the inner side of the prestressed tendons, a plurality of embedded positioning pieces are arranged in the top surface grooves, the positioning embedded pieces are uniformly distributed along the top surface grooves at equal intervals, the positioning embedded pieces are arranged at the bottoms of the top surface grooves, and the positioning embedded pieces are used for positioning concrete towers of fan equipment.
7. The method for constructing a large-volume concrete structure of a wind power foundation according to claim 1, comprising the steps of: S401, arranging temperature measuring points which are respectively arranged at the junction of the suspended part of the wind power foundation annular wall, the middle part of the wind power foundation cantilever plate and the bottom of the wind power foundation, wherein each temperature measuring point is provided with three upper, middle and lower parts; S402, determining the depth of a temperature measuring point, wherein the depth of the temperature measuring point above is within 50mm below the surface of the concrete, the temperature measuring point in the middle is positioned in the center of the thickness of the concrete, and the temperature measuring point below is positioned within 50mm above the bottom surface of the concrete; S403, selecting a proper temperature measuring line, wherein the length of the temperature measuring line is prolonged by more than 200mm on the basis of the depth of a temperature measuring point; S404, embedding a temperature measuring wire, binding the temperature measuring wire on the steel bars, binding and fixing the steel bars bound with the temperature measuring wire on a foundation main bar before pouring concrete, positioning a temperature sensor at a temperature measuring point, and covering the temperature sensor with a plastic bag after a plug is left outside the concrete, so that the temperature measuring wire is prevented from being wet and kept clean.
8. The method for constructing the large-volume concrete structure of the wind power foundation according to claim 1, wherein in the step S5, the wind power foundation is divided into a first block, a second block and a third block from bottom to top, the wind power foundation is horizontally pushed in parallel, an inclined layering, thin layer pouring, natural flowing, sequential pushing and one-time in-place continuous pouring mode is adopted vertically, the concrete moisture-preserving maintenance time is not less than 28d, and water is sprayed for not less than 2 times per day, so that the surface of the concrete is in a wet state.
9. The method for constructing the large-volume concrete structure of the wind power foundation according to claim 8, wherein the temperature of the concrete is monitored from the beginning of pouring, the whole process of raising the temperature, lowering the temperature, approaching to the ambient temperature and removing the heat preservation layer in the concrete is included, the temperature is measured 6 times every day and night for the first 3 days, the temperature is measured 4 times every day and night after the 3 days, and the temperature measuring time is continued for 14 days.
10. The method for constructing a large-volume concrete structure for a wind power foundation according to claim 9, wherein in step S5, the temperature control index includes: the temperature of the concrete entering the mould is 5-30 ℃; The temperature rise value of the concrete casting body on the basis of the mold entering temperature is not more than 50 ℃; the temperature difference of the inner surface of the concrete casting body is not more than 25 ℃; the cooling rate of the concrete casting body is not more than 2 ℃ per day; and when the heat preservation cover is removed, the temperature difference between the surface of the concrete pouring body and the atmosphere is not more than 20 ℃.

Description

Large-volume concrete structure construction method for wind power foundation Technical Field The invention relates to the technical field of engineering construction, in particular to a method for constructing a large-volume concrete structure of a wind power foundation. Background The fan foundation is a base of the fan tower barrel and bears the whole weight of the fan tower barrel, and all stress conditions including the conditions of supporting, anti-seismic, strong wind resistance and the like are borne on the base. The fan is firm and durable, plays a key role in safe and stable operation of the fan, and directly determines whether the fan is in existence or not. The concrete structure of the fan is characterized by larger structural size and volume, belongs to large-volume concrete, and has good durability and impermeability besides meeting the strength requirement under the environment condition of being moist or in contact with water for a long time. In addition, the unit cement consumption of the mass concrete is large, so that the hydration heat and shrinkage easily cause structural cracking, structural cracks are generated, and the damage is caused. How to control the temperature in the concrete pouring process is a great difficulty in construction. Disclosure of Invention In order to overcome the defects of the prior art, the invention provides a large-volume concrete structure construction method for a wind power foundation, which can effectively avoid the problem of structural cracking in the pouring process through strict temperature monitoring and reasonable pouring modes. In order to achieve the purpose, the method for constructing the large-volume concrete structure of the wind power foundation comprises the following steps: s1, excavating a foundation pit, namely excavating a foundation pit required by a wind power foundation in a target place; S2, erecting a template, and erecting a support template in the foundation pit according to construction requirements; s3, reinforcing bars are arranged, and the reinforcing bars are bundled according to construction requirements; s4, setting temperature measuring points, arranging the temperature measuring points at the designed positions, and embedding temperature measuring lines; And S5, pouring concrete, namely pouring the concrete in sequence in the areas, measuring the temperature in real time in the pouring process, and controlling the temperature and keeping moisture. Further, in step S1, the foundation pit includes a trapezoid cross section portion of the bottom and a rectangular cross section portion of the upper portion, the top of the trapezoid cross section portion of the foundation pit is the same as the bottom width of the rectangular cross section portion, and the bottom of the foundation pit is provided with a concrete cushion. Further, in step S2, the outer side of the supporting template is close to the inner wall of the foundation pit, and the inner side of the supporting template forms a cavity in the wind power foundation. Further, in step S3, the steel bars of the annular wall portion of the wind power foundation include a plurality of vertical bars, annular bars and longitudinal bars, the annular bars are arranged around the circumference, the longitudinal bars are arranged radially on the horizontal plane, the vertical bars are arranged vertically, the steel bars of the cantilever plate portion of the wind power foundation include a plurality of vertical bars, annular bars and oblique bars, the steel bars of the bottom of the wind power foundation include upper and lower layers of mesh steel bars, and a plurality of erection steel bars are arranged between the two layers of mesh steel bars. Further, the unsettled part of wind-powered electricity generation basis rampart inboard is equipped with the reservation pipeline, be equipped with the prestressing tendons in the reservation pipeline, the prestressing tendons is equidistant equipartition on the circumference of wind-powered electricity generation basis, the prestressing tendons includes pre-buried steel pipe, the top of pre-buried steel pipe exposes the top of wind-powered electricity generation basis rampart, the bottom of pre-buried steel pipe is equipped with the anchor backing plate, the cover has the spiral muscle on the pre-buried steel pipe, the spiral muscle is connected on the anchor backing plate, the top of pre-buried steel pipe sets up towards the inboard slope of wind-powered electricity generation basis rampart, one side orientation below of anchor backing plate wedge, the thickness that the thickness of the inboard one side of wind-powered electricity generation basis rampart is close to the anchor backing plate is less than the thickness of another side. Further, the wind power foundation top surface is located the prestressing tendons inboard and is equipped with annular top surface recess, is equipped with a plurality of pre-buried locating pieces i