Method for controlling appearance quality of circular truncated cone structure type concrete

Abstract

The invention provides a circular truncated cone structure type concrete appearance quality control method. The method comprises the following steps that firstly, a chamfering steel mold connected with a slope face is arranged at the lower end of an upper cylindrical steel mold; 2, shortening a handle of the single-roller leveling machine, and configuring a hanging fastener; thirdly, the upper cylindrical steel mold is installed in a suspended mode; a handle of the single-roller leveling machine is mounted on a tightening steel wire rope for hanging the upper cylindrical steel mold through a hanging fastener; a fourth part: paving concrete; the concrete pouring of the lower cylindrical steel mold is sequentially distributed from inside to outside, the slope surface is continuously paved from top to bottom, and the concrete pouring of the upper concrete steel mold is sequentially distributed from bottom to top; 5, slope surface concrete surface finishing; and after slope surface material distribution and finishing are completed, the single-roller leveling machine is operated to carry out surface shaping along the slope surface. According to the method, construction is completed quickly and efficiently, and the overall appearance quality of the slope concrete surface is controlled.

Description

Technical Field

[0001] The invention relates to the field of concrete construction, and in particular to a method for controlling the appearance quality of truncated cone structure concrete. Background Art

[0002] As a clean energy, wind power has far less impact on the environment than fossil energy. In recent years, it has developed rapidly under the country's vigorous promotion.

[0003] At present, the main quality assessment of wind power projects lies in equipment manufacturing and construction quality. As the requirements become higher and higher, the assessment of various details of wind power construction is gradually mentioned.

[0004] Among them, the steel tower fan foundation structure as an integral part of the project quality has always been one of the most concerned issues in the construction process. The steel tower fan foundation structure is mostly a gravity-type extended foundation, and the appearance quality of the cone construction depends only on the workers' sense of responsibility and proficiency.

[0005] After consulting the literature, no new control technology for the appearance quality of gravity-type expansion structure concrete was found. In the conventional construction process, strings are usually arranged along the edge of the formwork, and the workers control the concrete paving thickness mainly based on their intuitive feeling, and manually smoothen the surface for detailed processing.

[0006] However, in reality, during the construction process, personnel walk repeatedly on the slope, and the layout of ropes may easily cause safety risks of personnel falling. In order to speed up the foundation pouring construction rate and avoid cold joints in the concrete, the slump of the slope concrete is often required to be 140-160mm. After paving, the concrete quickly loses its plasticity, and the straightness and flatness of the cone itself are difficult to control, which may easily cause the appearance quality of the concrete to fail to meet the visual requirements.

[0007] In order to improve the appearance quality of wind turbine foundation concrete construction, it is necessary to develop a new method for controlling the appearance quality of truncated cone structure concrete. Summary of the invention

[0008] The purpose of the present invention is to address the deficiencies of the prior art and to provide a method for controlling the appearance quality of truncated cone structure concrete, which can quickly and efficiently complete concrete construction and significantly improve the surface flatness, slope and overall appearance quality of the slope concrete.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is: a method for controlling the appearance quality of truncated cone structure concrete, comprising the following contents: Part 1: Mold modification; the truncated table mold includes an upper cylindrical steel mold and a lower cylindrical steel mold, and a chamfered steel mold connected to the slope surface is arranged at the lower end of the upper cylindrical steel mold; Part Two: Transformation of the single-roller leveling machine; shorten the handle of the single-roller leveling machine to lower the overall center of gravity and configure suspension fasteners; Part Three: Installation of the mold and the single-roller leveling machine; the upper cylindrical steel mold is suspended by hanging; the handle of the single-roller leveling machine is installed on the tight steel wire rope for hanging the upper cylindrical steel mold through the suspension fastener. Before construction, check whether the suspension height at one end of the single-roller leveling machine is close to the chamfer steel mold and whether the other end is aligned with the upper edge of the lower cylindrical steel mold; Part Four: Concrete paving; for the concrete pouring of the lower cylindrical steel mold, the concrete is fed in sequence from the inside to the outside, the slope surface is continuously paved from top to bottom, and the concrete pouring of the upper concrete steel mold is fed from bottom to top; among them, the slope surface needs to be vibrated and replenished after paving; Part Five: Concrete finishing of the slope surface; after the slope surface is fed and trimmed, operate the single-roller leveling machine to perform surface shaping along the slope surface to achieve the design purpose; Finally, cover and cure until the frustum structure solidifies and forms.

[0010] Preferably, in the first part, the chamfer steel mold is fixed to the upper cylindrical steel mold by bolts.

[0011] Preferably, in the first part, the included angle between the chamfer steel mold and the upper cylindrical steel mold is 45°.

[0012] Preferably, in the first part, during the suspension process of the upper cylindrical steel mold, it is temporarily supported by an "L"-shaped steel bar bracket.

[0013] Preferably, in the second part, the handle of the single-roller leveling machine is changed from an "A"-shaped or "U"-shaped handle to a "field"-shaped handle and the height is reduced to lower the center of gravity of the leveling machine.

[0014] Preferably, in the third part, the upper cylindrical steel mold is fastened and suspended by steel wire ropes and chain hoists, and the handle of the single-roller leveling machine is installed on the steel wire rope used for suspending the upper cylindrical steel mold through fasteners.

[0015] Preferably, in the fourth part, during the process of concrete paving on the slope surface, control the concrete slump at 140 mm - 160 mm, and evenly spread the concrete material by the cooperation of a pump truck / 布料 machine and manual method.

[0016] Preferably, in the fourth part, during the process of replenishing the slope surface, it is judged whether to feed or reduce the concrete material during the single vibration process of the single-roller leveling machine to achieve rough leveling.

[0017] Preferably, the material for covering finally is plastic film covering.

[0018] Preferably, the curing process adopts sprinkler curing.

[0019] Compared with the prior art, the present invention has outstanding substantial features and significant progress. Specifically, the present invention is mainly used for the appearance quality control of concrete pouring construction of wind turbine foundation. In the traditional method, the slope surface construction is completed, and then a certain period of time is waited before the construction of the connection with the upper cylinder is completed. After reaching stability, it is necessary to wait for 1-2 hours before continuing the upper cylindrical concrete construction. The overall construction efficiency is very low, and the quality of the concrete connection is very poor due to the lack of control measures for the appearance. Under the new scheme, the shape of the upper cylindrical steel mold is modified to include the shape of the connection, and the new structure of the single-drum leveling machine is used for suspended construction, so that the construction of the slope surface and the upper cylinder can be carried out continuously, which greatly improves the construction efficiency. Under the constraint of the mold, the overall appearance quality can also be controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a construction principle diagram of the method for controlling the appearance quality of the truncated cone structure type concrete in the present invention.

[0021] In the figure: 1. Upper cylindrical steel mold; 2. Handle of the single roller leveling machine; 3. Single roller leveling machine; 4. Chamfering steel mold; 5. Roller; 6. Lower cylindrical steel mold. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0023] like Figure 1 As shown, a method for controlling the appearance quality of a truncated cone structure type concrete includes the following contents: Part 1: Mold modification; the truncated cone mold includes an upper cylindrical steel mold 1 and a lower cylindrical steel mold 6. The lower end of the upper cylindrical steel mold 1 is provided with a chamfered steel mold 4 connected with the slope surface. The chamfered steel mold is fixed to the upper cylindrical steel mold by bolts, and the angle between the chamfered steel mold and the upper cylindrical steel mold is 45°.

[0024] When designing the upper cylindrical steel formwork, the lower part is usually processed into a flat surface for ease of installation. In order to reduce the equal-strength time during the pouring process and prevent the concrete from surging at the bottom of the joint, a 45° slope is processed at the bottom of the steel formwork. Since steel formworks are mostly manufactured in an assembled manner, two bolt holes are added to a single formwork, and an additional inclined steel formwork with a width of 20 cm is added to connect to the cylindrical steel formwork. The contact surface is fixed with ordinary bolts to fix the entire upper cylindrical steel formwork.

[0025] During the actual pouring process under the original technology, the concrete at the junction of the steel formwork and the slope surface needs to reach a stable state. Often, after pouring the slope surface, it is necessary to wait for 1-2 hours before continuing to pour the upper cylindrical concrete, which affects the pouring construction rate of the fan foundation, and the appearance quality of the concrete at the junction is poor after removing the formwork.

[0026] Under the new reconstructed structure, continuous pouring can be achieved, improving efficiency and ensuring aesthetics.

[0027] Part Two: Transformation of the single-roller screed 3; The single-roller screed 3 commonly used in the market is mostly used for the flat operation of cast-in-place concrete, and can quickly complete the leveling and vibrating operations on the concrete surface. The screed can select parameters such as power and roller length according to the working surface.

[0028] The conical frustum structure type is the most difficult to control the thickness of the concrete paving material. If it is necessary to achieve the slope ratio and fix the slope of the working surface of the roller 5 according to the design requirements, the screed needs to be transformed before operation so that the roller 5 can level and vibrate closely against the slope surface according to a unified slope ratio.

[0029] Specifically, shorten the handle of the single-roller screed 3 to reduce the overall center of gravity and configure suspension fasteners; Specifically, the handle 2 of the single-roller screed is changed from an "A"-shaped or "U"-shaped handle to a "field"-shaped handle and the height is reduced to lower the center of gravity of the screed.

[0030] Part Three: Installation of the mold and the single-roller screed; The upper cylindrical steel mold is suspended and installed in a hanging manner; Specifically, 8# steel wire rope + chain hoist are used for fastening during fixation. During the suspension process of the upper cylindrical steel mold, it is temporarily supported by an "L"-shaped steel bar bracket, and the "L"-shaped steel bar bracket can be temporarily fixed on the ground.

[0031] The handle of the single-roller screed is installed on the tightened steel wire rope suspending the upper cylindrical steel mold through a suspension fastener. Before construction, check whether the suspension height at one end of the single-roller screed is close to the chamfer steel mold and whether the other end is aligned with the upper edge of the lower cylindrical steel mold. No fixing measures are required and manual control is sufficient.

[0032] Part Four: Concrete paving; The concrete of the lower cylindrical steel mold is poured in sequence from the inside to the outside. When pouring to the slope surface, it is continuously paved from top to bottom. At this time, the concrete slump is controlled at 140 - 160 mm, and it is evenly spread on the slope surface by a pump truck / boom pump + manual method. The screed first performs single vibration, and judges whether local replenishment or reduction of concrete is needed based on the surface formed by vibration to achieve the purpose of rough leveling.

[0033] The concrete of the upper concrete steel mold is poured from bottom to top.

[0034] Part Five: After completing the local trimming of the slope surface, the single-roller screed vibrates carefully along the slope surface to achieve a flat surface and the slope ratio of the slope surface meets the design requirements. After finishing the finishing, immediately cover it with a plastic film and carry out the watering and curing work.

[0035] Finally, cover and cure until the conical frustum structure solidifies and takes shape.

[0036] This solution is mainly used in the concrete pouring construction of wind turbine foundations. Compared with conventional methods, it can complete concrete construction quickly and significantly improve the surface flatness, slope and overall appearance quality of the concrete on the slope, which has been unanimously recognized by all parties involved in the construction.

[0037] Finally, it should be noted that: The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. A method for controlling the appearance quality of truncated cone structure concrete, characterized in that: It includes the following contents: The first part: Die modification; The frustum die includes an upper cylindrical steel die and a lower cylindrical steel die, and a chamfer steel die connected to a slope surface is arranged at the lower end of the upper cylindrical steel die; The second part: Modification of the single-roller leveling machine; Shorten the handle of the single-roller leveling machine to lower the overall center of gravity, and configure a suspension fastener; The third part: Installation of the die and the single-roller leveling machine; The upper cylindrical steel die is suspended and installed in a hanging manner; The handle of the single-roller leveling machine is installed on the tight steel wire rope for hanging the upper cylindrical steel die through a suspension fastener. Before construction, check whether the suspension height at one end of the single-roller leveling machine is close to the chamfer steel die and whether the other end is aligned with the upper edge of the lower cylindrical steel die; The fourth part: Concrete paving; The concrete of the lower cylindrical steel die is poured in sequence from the inside to the outside, the slope surface is continuously paved from top to bottom, and the concrete of the upper concrete steel die is poured from bottom to top; Among them, the slope surface needs to be vibrated and replenished after paving; The fifth part: Concrete finishing of the slope surface; After the paving and trimming of the slope surface are completed, operate the single-roller leveling machine to perform surface shaping along the slope surface to achieve the design purpose; Finally, cover and cure until the frustum structure solidifies and takes shape.

2. The method for controlling the appearance quality of truncated cone structure concrete according to claim 1, characterized in that: In the first part, the chamfer steel die is fixed to the upper cylindrical steel die by bolts.

3. The method for controlling the appearance quality of truncated cone structure concrete according to claim 2, characterized in that: In the first part, the included angle between the chamfer steel die and the upper cylindrical steel die is 45°.

4. The method for controlling the appearance quality of truncated cone structure concrete according to claim 3 is characterized in that: In the first part, during the suspension process of the upper cylindrical steel die, it is temporarily supported by an "L"-shaped steel bar bracket.

5. The method for controlling the appearance quality of truncated cone structure concrete according to claim 4, characterized in that: In the second part, the handle of the single-roller leveling machine is changed from an "A"-shaped or "U"-shaped handle to a "field"-shaped handle and the height is reduced to lower the center of gravity of the leveling machine.

6. The method for controlling the appearance quality of truncated cone structure concrete according to claim 5, characterized in that: In the third part, the upper cylindrical steel die is fastened and suspended by a steel wire rope and a chain block, and the handle of the single-roller leveling machine is installed on the steel wire rope for suspending the upper cylindrical steel die through a fastener.

7. The method for controlling the appearance quality of truncated cone structure concrete according to claim 6, characterized in that: In the fourth part, during the process of paving the concrete on the slope surface, control the concrete slump at 140mm - 160mm, and evenly spread the concrete material in a manner coordinated by a pump truck / agitator and manual labor.

8. The method for controlling the appearance quality of truncated cone structure concrete according to claim 7, characterized in that: In the fourth part, during the process of replenishing the material on the slope surface, it is judged whether to distribute or reduce the concrete material during the single vibration process of the single-roller leveling machine to achieve rough leveling.

9. The method for controlling the appearance quality of truncated cone structure concrete according to claim 8, characterized in that: The material for the final covering is plastic film covering.

10. The method for controlling the appearance quality of truncated cone structure concrete according to claim 8, characterized in that: The curing process adopts sprinkler curing.

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