Guiding and discharging repairing method and system for annular crack of mixed tower foundation

Abstract

The invention belongs to the technical field of structural engineering maintenance and reinforcement, and provides a drainage repair method and system for an annular crack of a mixed tower foundation, a concrete base layer of an area where the annular crack is located is cleaned, and a drainage groove is dug along the trend of the annular crack; a grouting hole is drilled in the drainage groove to the depth of the annular crack, and high-permeability chemical grout is injected to block the leakage channel and reduce the water burst pressure; an annular drainage pipe is installed at the bottom of the drainage groove, and a water collecting chamber is formed at the lowest point of a pipeline of the annular drainage pipe. A power drainage device is installed in the water collecting chamber, and liquid is led outdoors through the power drainage device; and in the drainage groove, a permeable layer, a rigid filling layer and a flexible sealing layer are sequentially constructed above the annular drainage pipe, and surface layer rigid-flexible composite plugging is formed. According to the method, the repairing strategy can be changed from the mechanism, passive plugging is changed into active drainage decompression, and therefore the long-term and reliable repairing effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of structural engineering maintenance and reinforcement, and particularly relates to a method and system for inducing and draining repair of ring-shaped cracks in a tower foundation. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] The transition area between the cavity bottom plate and the ring-shaped bearing platform of a steel-concrete tower wind turbine foundation is a stress concentration area. Under the coupling action of multiple factors such as long-term operation dynamic load of the wind turbine, structural dead weight, and pile-soil interaction, this area is prone to develop into a through ring-shaped crack. Such a crack destroys the integrity and self-waterproofing ability of the concrete structure, becomes a major channel for groundwater to enter the tower foundation, and in severe cases, can cause a large amount of water to accumulate in the foundation cavity, threatening the safety of electrical equipment, and in freezing and thawing areas, exacerbating structural damage and shortening the service life of the foundation.

[0004] Existing repair technologies are mostly passive plugging, such as applying waterproof mortar to the surface of the crack or high-pressure injection of chemical slurry (such as polyurethane, epoxy resin) into the crack. Such methods have significant technical limitations: The repair layer will directly and long-term bear the static water pressure of external groundwater. Once there are minor imperfections in the bonding interface between the repair material and the concrete base layer, or new defects are generated under the continuous micro-deformation of the structure, high-pressure water will quickly break through the plugging, leading to the recurrence of leakage and failing to fundamentally solve the problem.

[0005] In addition, purely rigid plugging materials are difficult to adapt to the dynamic deformation of the tower foundation, and purely flexible plugging materials have limited water pressure resistance, so the durability of the repair effect is generally insufficient. SUMMARY

[0006] To solve the above problems, the present application proposes a method and system for inducing and draining repair of ring-shaped cracks in a tower foundation, which can change the repair strategy from passive plugging to active induction and pressure reduction, thereby achieving long-term and reliable repair effect.

[0007] According to some embodiments, the present application adopts the following technical solutions: A method for inducing and draining repair of ring-shaped cracks in a tower foundation, comprising the following steps: cleaning the concrete base layer in the area where the ring-shaped crack is located, and excavating a drainage groove along the direction of the ring-shaped crack; drilling a grouting hole in the drainage groove to the depth of the ring-shaped crack and injecting a high-permeability chemical slurry to plug the leakage channel and reduce the water pressure; A ring-shaped drainage pipe is installed at the bottom of the drainage groove, and a water collecting chamber is formed at the lowest point of the pipeline of the ring-shaped drainage pipe; A power drainage device is installed in the water collecting chamber, and the power drainage device is used to guide the liquid to the outside. In the drainage groove, a water permeable layer, a rigid filling layer and a flexible sealing layer are sequentially constructed above the ring-shaped drainage pipe to form a surface layer of rigid and flexible composite sealing.

[0008] As an alternative embodiment, the process of excavating the drainage groove along the direction of the ring-shaped crack includes: excavating a U-shaped drainage groove at the top of the ring-shaped crack along the direction of the ring-shaped crack.

[0009] As an alternative embodiment, the process of installing a ring-shaped drainage pipe at the bottom of the drainage groove includes: installing a ring-shaped drainage pipe in the drainage groove, and the width of the cross section of the side surface of the ring-shaped drainage pipe decreases from top to bottom, which is matched with the shape of the drainage groove, and the ring-shaped drainage pipe is provided with a drainage hole.

[0010] As an alternative embodiment, the process of forming a water collecting chamber at the lowest point of the pipeline of the ring-shaped drainage pipe includes: placing a water tank on the base plate corresponding to the lowest point of the path of the ring-shaped drainage pipe, and the water tank forms the water collecting chamber, and the port of the ring-shaped drainage pipe is connected to the side wall of the water tank through a reserved hole and a pipeline.

[0011] As an alternative embodiment, in the process of sequentially constructing a water permeable layer, a rigid filling layer and a flexible sealing layer, the water permeable layer is a geotextile or a bean stone layer; the rigid filling layer is a non-shrinkage polymer mortar; and the flexible sealing layer is a polysulfide or silicone building sealing paste.

[0012] A drainage and repair system for a ring-shaped crack of a tower foundation, comprising: A drainage groove is arranged along the direction of the ring-shaped crack. A ring-shaped drainage pipe is installed at the bottom of the drainage groove. A water collecting chamber is in communication with the ring-shaped drainage pipe, and a power drainage device is installed in the water collecting chamber to guide the liquid to the outside. A water permeable layer, a rigid filling layer and a flexible sealing layer are sequentially arranged above the ring-shaped drainage pipe in the drainage groove.

[0013] As an alternative embodiment, the cross section of the drainage groove is U-shaped and arranged at the upper part of the ring-shaped crack.

[0014] As an alternative embodiment, the cross section of the ring-shaped drainage pipe is D-shaped, and a tee joint is connected to the water collecting chamber at the water outlet.

[0015] As an alternative embodiment, the water collecting chamber is a prefabricated water tank made of a high polymer material or stainless steel.

[0016] As an alternative embodiment, the power drainage device comprises a micro-submersible pump and a liquid level sensor; the liquid level sensor is used to monitor the water level in the water collecting chamber, and the start and stop of the micro-submersible pump is controlled according to a preset threshold, the outlet of the micro-submersible pump is connected with a pressure hose, and the pressure hose is laid upward and led to an outdoor safe drainage area of the water collecting chamber.

[0017] Compared with the prior art, the beneficial effects of the present application are: The present application constructs an active drainage system by the strategy of "plugging first and then draining, combination of plugging and draining", which is used to deal with the residual leakage after chemical grouting, fundamentally eliminates the hydrostatic pressure acting on the back of the final sealing layer, and greatly improves the long-term reliability and durability of the repaired structure.

[0018] The present application actively collects the leakage water and forcibly drains it in a powered manner, completely eliminates the hydrostatic pressure acting on the back of the sealing layer, and fundamentally solves the problem of repeated failure of traditional sealing schemes due to water pressure.

[0019] The power drainage device of the present application is automatically controlled by the liquid level sensor, can be intelligently started and stopped according to the actual leakage water quantity, realizes all-weather automatic drainage without manual operation, and has low operation and maintenance cost.

[0020] The system of the present application integrates "deep grouting pressure relief, active drainage pressure reduction, and surface rigid-flexible composite sealing" into one, constructs a three-dimensional and multi-level comprehensive protection system, and has much higher reliability than a single repair technology.

[0021] The present application provides a unique and complete technical solution for the working condition that the water must be drained upward, and solves the engineering problem that gravity flow cannot be implemented.

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are used for explanation. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings accompanying the specification of the present application are used to provide further understanding of the present application, the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application.

[0024] Figure 1 The cross-sectional schematic diagram of the existing mixed tower foundation annular crack leakage state described in the present application is used to show the original problem to be repaired.

[0025] Figure 2 The cross-sectional schematic diagram of the slotting and pressure relief grouting step in the repair method of the present application is used to show the pretreatment work before repair Figure 3This is a top view of the repair system of the present invention, used to show the planar positional relationship between the annular drainage pipe and the water collection chamber.

[0026] Figure 4 This is a detailed cross-sectional view of the water collection and discharge module of the present invention, used to demonstrate the installation method of the power drainage device in the water collection tank.

[0027] Figure 5 This is an enlarged cross-sectional view of the U-shaped drainage channel after the repair of the present invention, used to demonstrate the structure of the multi-layer sealing structure.

[0028] Figure 6 This is a frontal sectional view of the working principle of the power-lifting emission system of the present invention, used to show the overall water flow path of the system.

[0029] Among them, 1. foundation plate, 2. pier, 3. annular crack, 4. leakage path, 5. U-shaped drainage channel, 6. grouting hole, 7. annular drainage pipe, 8. water collection chamber, 9. discharge direction, 10. inlet pipe, 11. miniature submersible pump, 12. liquid level sensor, 13. outlet pipe, 14. permeable layer, 15. rigid filling layer, 16. flexible sealing layer, 17. water flow path. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] Where there is no conflict, the embodiments and features described in this application may be combined with each other.

[0034] Example 1 A method for draining and repairing annular cracks in a mixed-structure tower foundation includes the following steps: For example Figure 1 The concrete base layer of the foundation slab 1 in the area where the annular crack 3 is located is cleaned, and a U-shaped drainage channel 5 is excavated along the crack direction, as shown. Figure 2 As shown; A grouting hole 6 is drilled in the drainage groove to the depth of the crack, and a high-permeability chemical slurry is injected to block the main leakage channel and reduce the water gushing pressure; A D-shaped cross-section annular drainage pipe 7 with drainage holes in the upper part is installed at the bottom of the drainage groove; at the lowest point of the pipe line of the annular drainage pipe 7, a water tank is connected to form a water collecting chamber 8, as shown in Figure 3 、 Figure 4 ; A set of power drainage devices is installed in the water collecting chamber 8, and the outlet pipe line 13 of the power drainage devices is led to the outdoor from the foundation, as shown in Figure 6 ; In the drainage groove, above the annular drainage pipe 7, a water-permeable layer, a rigid filling layer and a flexible sealing layer are sequentially constructed, as shown in Figure 5 .

[0035] In this embodiment, the annular drainage pipe 7 is a hard polymer material pipe with a D-shaped cross-section, and the circular arc top surface with drainage holes faces the inside of the groove.

[0036] In this embodiment, the power drainage device includes a micro-submersible pump 11 and a liquid level sensor 12; the liquid level sensor 12 is used to monitor the water level in the water collecting chamber 8 and control the start and stop of the micro-submersible pump 11 according to the preset threshold value.

[0037] In this embodiment, in the combined sealing and protection step, the water-permeable layer 14 is a geotextile or a bean stone layer; the rigid filling layer 15 is a non-shrinkage polymer mortar; and the flexible sealing layer 16 is a polysulfide or silicone building sealing paste.

[0038] Embodiment Two A combined sealing and protection system for repairing a ring-shaped crack in a tower foundation, comprising: A ring-shaped drainage module arranged in a U-shaped drainage groove 5 along the crack, which is composed of a ring-shaped drainage pipe 7 with a circular arc hole and a water-permeable layer covering it; A water collecting and discharging module, which includes a water collecting chamber 8 communicating with the ring-shaped drainage pipe 7, and a set of power drainage devices installed in the water collecting chamber 8, and the outlet pipe line 13 of the power drainage devices is led to the outdoor; A combined sealing and protection module filled in the U-shaped drainage groove 5 and located above the ring-shaped drainage module, which is composed of a rigid filling layer and a flexible sealing layer on the surface.

[0039] In this embodiment, the cross-section of the ring-shaped drainage pipe 7 is D-shaped, and a tee joint is connected at the water outlet.

[0040] In this embodiment, the power drainage device includes a micro-submersible pump 11 and at least one liquid level sensor 12 for controlling the start and stop of the micro-submersible pump 11.

[0041] Example 3 A method for draining and repairing annular cracks in a mixed-structure tower foundation, for Figure 1 The inner wall of the concrete tower foundation, which has developed annular crack 3 and is leaking water, was treated. Using tools such as an angle grinder and a high-pressure water gun, the concrete surface near the crack was cleaned. Then, using a cutting machine and an electric hammer, a U-shaped drainage channel, 50mm wide and 60mm deep, was chiseled into the inner wall along the direction of the annular crack 3.

[0042] Next, as Figure 2 As shown, grouting holes 6 are drilled at an angle of approximately 45 degrees within the drainage channel using an impact drill, with the hole depth required to penetrate the area affected by the crack. After installing a check valve-type grouting nozzle, a hydrophilic polyurethane chemical grout is injected using a high-pressure grouting pump. This grout rapidly expands and solidifies upon contact with water, sealing the main leakage channels and reducing the pressure of the surface water.

[0043] It should be noted that the main purpose of this pressure relief grouting step is to seal the active, visible main leakage channels and solve the "open water" problem, thereby providing the necessary dry working surface for subsequent processes. However, chemical grouting cannot guarantee 100% filling of all microscopic capillary cracks, nor can it prevent the structure from generating new micro-leakage paths under future continuous stress.

[0044] Then, as Figure 3 As shown, the drainage channel is cleaned after grouting, and a rigid PVC annular drainage pipe 7 with a D-shaped cross-section is installed at the bottom of the channel. Figure 4 As shown, at the lowest point of the path of the annular drainage pipe 7, a prefabricated water tank made of polymer material or stainless steel is placed, which constitutes the water collection chamber 8. The port of the annular drainage pipe 7 is connected to the side wall of the water collection tank through a reserved hole.

[0045] Subsequently, as Figure 4 and Figure 6 As shown, a miniature submersible pump 11 is installed in the water collection chamber 8, with a float-type level switch integrated at its bottom. The pump outlet is connected via a pressure-resistant hose that extends upwards to an outdoor safe drainage area. The pump's waterproof cable is also led through a sealed conduit to a maintenance power supply inside the foundation. When the water level in the water collection chamber 8 rises and lifts the float, the miniature pump automatically starts, forcibly discharging the water; when the water level drops, the pump automatically stops.

[0046] Finally, as Figure 5As shown, above the annular drainage pipe 7 in the U-shaped drainage groove, first cover a layer of geotextile as a filter layer to prevent small particles from clogging the drainage pipe. Then, 35mm thick non-shrinkage polymer mortar is poured as a rigid filling layer. After curing to the design strength, high-performance polysulfide sealing paste is embedded in the 5mm deep notch reserved in the groove, serving as a flexible sealing layer with high elongation. At this point, the repair construction is completed.

[0047] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principles of the present application without creative labor should be included in the protection scope of the present application.

Claims

1. A method for draining and repairing annular cracks in a mixed-structure tower foundation, characterized in that, The method comprises the following steps: cleaning the concrete base layer in the area where the ring-shaped crack is located and excavating a drainage groove along the direction of the ring-shaped crack; drilling a grouting hole in the drainage groove to the depth of the ring-shaped crack and injecting a high-permeability chemical grout to block the leakage channel and reduce the water gushing pressure; installing a ring-shaped drainage pipe at the bottom of the drainage groove and forming a water collecting chamber at the lowest point of the pipeline of the ring-shaped drainage pipe; installing a powered drainage device in the water collecting chamber and using the powered drainage device to guide the liquid to the outdoor; in the drainage groove, sequentially constructing a water-permeable layer, a rigid filling layer and a flexible sealing layer above the ring-shaped drainage pipe to form a surface layer rigid-flexible composite sealing.

2. The method of claim 1, wherein the method further comprises the step of: The process of excavating the drainage groove along the direction of the ring-shaped crack comprises: along the direction of the ring-shaped crack, excavating a U-shaped drainage groove at the top of the ring-shaped crack. ​ 3. The method for draining and repairing annular cracks in a mixed-structure foundation as described in claim 1, characterized in that, The process of installing the ring-shaped drainage pipe at the bottom of the drainage groove comprises: arranging the ring-shaped drainage pipe in the drainage groove, and the width of the cross section of the side surface of the ring-shaped drainage pipe decreases from top to bottom, which is matched with the shape of the drainage groove, and the ring-shaped drainage pipe is provided with a drainage hole.

4. The method for draining and repairing annular cracks in a mixed-structure foundation as described in claim 1, characterized in that, The process of forming the water collecting chamber at the lowest point of the pipeline of the ring-shaped drainage pipe comprises: placing a water tank on the base plate corresponding to the lowest point of the path of the ring-shaped drainage pipe, and the water tank forms the water collecting chamber, and the port of the ring-shaped drainage pipe is connected to the side wall of the water tank through a reserved hole and a pipeline.

5. The method for draining and repairing annular cracks in a mixed-structure foundation as described in claim 1, characterized in that, In the process of sequentially constructing the water-permeable layer, the rigid filling layer and the flexible sealing layer, the water-permeable layer is a geotextile or a bean stone layer; the rigid filling layer is a non-shrinkage polymer mortar; and the flexible sealing layer is a polysulfide or silicone building sealing paste.

6. A drainage and repair system for annular cracks in a mixed-structure tower foundation, characterized in that, The method comprises the following steps: a drainage groove is arranged along the direction of the ring-shaped crack; a ring-shaped drainage pipe is installed at the bottom of the drainage groove; a water collecting chamber is in communication with the ring-shaped drainage pipe, and a powered drainage device is installed in the water collecting chamber to guide the liquid to the outdoor; a water-permeable layer, a rigid filling layer and a flexible sealing layer are sequentially arranged above the ring-shaped drainage pipe in the drainage groove.

7. A system for repairing a circumferential crack in a tower foundation according to claim 6, wherein: The cross section of the drainage groove is U-shaped and arranged at the upper part of the ring-shaped crack.

8. A system for repairing a circumferential crack in a tower foundation according to claim 6, wherein: The cross section of the ring-shaped drainage pipe is D-shaped, and a tee joint is connected to the water collecting chamber at the water outlet.

9. A mixed tower foundation annular crack inducing and draining repair system according to claim 6, characterized in that, The water collecting chamber is a prefabricated water tank made of a high polymer material or stainless steel.

10. A system for repairing a circumferential crack in a tower foundation according to claim 6, wherein The powered drainage device comprises a micro-submersible pump and a liquid level sensor; the liquid level sensor is used to monitor the water level in the water collecting chamber and control the start and stop of the micro-submersible pump according to a preset threshold value; the outlet of the micro-submersible pump is connected to a pressure-resistant hose, and the pressure-resistant hose is laid upward and guided to the outdoor safe drainage area of the water collecting chamber.

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