Anchor hole protection method

Abstract

The present invention belongs to the technical field of anchor foundation construction, and discloses an anchor hole protection method, including: S1, measuring and determining the preset plugging depth position of the expansion body in the anchor hole; S2, placing the expansion body at the position of the anchor hole mouth, and driving the expansion body to expand in the anchor hole until the tightening force of the expansion body on the inner wall of the anchor hole reaches a preset range; S3, lowering the expansion body to the preset plugging depth position; S4, driving the expansion body to expand to the expansion degree in S2. Before excavating the foundation pit of the cap, the anchor hole is blocked by the expansion body to prevent debris from falling into the anchor hole during the excavation of the foundation pit, thereby reducing the workload of later cleaning. After the tightening force of the expansion body on the inner wall of the anchor hole is driven to reach a preset range, the expansion degree that the expansion body should have when blocking the anchor hole can be determined. The expansion degree can ensure that the expansion body can reliably and tightly block the anchor hole, avoid the phenomenon that the anchor hole is blocked by foreign objects and the inner wall of the anchor hole collapses and deforms when the foundation pit of the cap is excavated, and effectively protect the formed anchor hole.

Description

Technical Field

[0001] The invention relates to the technical field of anchor rod foundation construction, and in particular to an anchor hole protection method. Background Art

[0002] The multiple legs of the power tower are each located on a cap. The construction process of the cap includes the construction of the anchor foundation and the forming construction of the cap. During construction, the anchor foundation is first constructed, and then the concrete cap is cast. Specifically, the construction process of the anchor foundation includes: determining the center position of all anchor holes according to the center of the cap; drilling holes at the center position of the anchor holes; completing the construction of all anchor holes in a single cap according to the preset drilling sequence; excavating the foundation pit of the cap; removing the blockage of the anchor holes, inserting anchors in the anchor holes and grouting. That is, during construction, all the anchor holes in the cap are drilled first, and then the foundation pit of the cap is excavated, which avoids deep foundation pit operations when constructing anchor holes, effectively reduces the difficulty of construction, and has a high safety factor.

[0003] However, the following defects exist in the method of drilling anchor holes first and then excavating the foundation pit of the cap: debris and residues from the excavation of the foundation pit of the cap fall into the formed anchor holes, causing the anchor holes to be blocked by foreign objects. A lot of cleaning work is required before inserting anchor rods and grouting, which seriously delays the construction period. In addition, the inner wall of the anchor hole may collapse and deform during the excavation of the foundation pit, which requires subsequent repair work, increasing the difficulty of construction.

[0004] Therefore, there is an urgent need for an anchor hole protection method to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide an anchor hole protection method, which can effectively solve the problem that the anchor hole is blocked by foreign objects and the inner wall of the anchor hole is prone to collapse and deformation when excavating a foundation pit.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Provided is an anchor hole protection method, which uses an expansion body to seal and protect the formed anchor hole. The method of using an expansion body to seal and protect the formed anchor hole includes the following steps:

[0008] S1, measuring and determining a preset plugging depth position of the expansion body in the anchor hole;

[0009] S2, placing the expansion body at the opening of the anchor hole, and driving the expansion body to expand in the anchor hole until the tightening force of the expansion body on the inner wall of the anchor hole reaches a preset range;

[0010] S3, lowering the expansion body to the preset plugging depth position;

[0011] S4. Driving the expansion body to expand to the expansion degree in S2.

[0012] As a preferred solution of the anchor hole protection method provided by the present invention, the expansion body is an air bag;

[0013] In S2, the airbag is placed at the opening of the anchor hole and inflated until the tightening force of the airbag on the inner wall of the anchor hole reaches a preset range, and the inflation pressure data is recorded;

[0014] In S3, after part of the gas in the airbag is discharged, the airbag is pushed to the preset blocking depth position;

[0015] In S4, the airbag is inflated to the recorded inflation pressure value.

[0016] As a preferred solution of the anchor hole protection method provided by the present invention, an air nozzle is provided on the airbag, and the airbag is deflated by loosening the air nozzle. An inflation tube is sleeved on the air nozzle, and an inflation device is connected to the end of the inflation tube away from the airbag, and the inflation device inflates the airbag through the inflation tube.

[0017] As a preferred solution of the anchor hole protection method provided by the present invention, a pressure indicating module is provided on the inflation device, and the pressure indicating module is used to measure and record the inflation pressure of the airbag.

[0018] As a preferred solution of the anchor hole protection method provided by the present invention, S2 also includes checking the airtightness of the airbag: after the tightening force of the airbag on the inner wall of the anchor hole reaches a preset range, the airbag is left to stand for a preset time T, during which the drop in the inflation pressure of the airbag is observed to see whether it exceeds a threshold value.

[0019] As a preferred solution of the anchor hole protection method provided by the present invention, the inflation tube is a hose.

[0020] As a preferred solution of the anchor hole protection method provided by the present invention, the expansion body comprises an outer membrane, the inner part of the outer membrane is sealed and filled with gas or liquid, and the upper and lower sides of the outer membrane are respectively sealed and connected with an upper flange plate and a lower flange plate;

[0021] In S2, the upper flange plate and the lower flange plate are driven to approach each other so as to expand the outer membrane until the tightening force of the outer membrane on the inner wall of the anchor hole reaches a preset range, and the distance between the upper flange plate and the lower flange plate is recorded;

[0022] In S3, after the upper flange plate and the lower flange plate are driven away from each other, the expansion body is lowered to the preset plugging depth position;

[0023] In S4, the upper flange plate and the lower flange plate are driven to approach each other to the recorded distance value.

[0024] As a preferred embodiment of the anchor hole protection method provided by the present invention, in S1, the preset plugging depth position is determined according to the design depth h of the foundation pit of the cap, and in S4, the highest point of the expansion body is lower than the design depth h of the foundation pit of the cap.

[0025] As a preferred solution of the anchor hole protection method provided by the present invention, a pressure sensor is attached to the outer wall of the expansion body, and the detection value of the pressure sensor is monitored to determine whether the tightening force of the expansion body on the inner wall of the anchor hole is within a preset range.

[0026] As a preferred solution of the anchor hole protection method provided by the present invention, the expansion body is made of elastic material.

[0027] Beneficial effects of the present invention:

[0028] The present invention provides an anchor hole protection method. Before excavating the foundation pit of the pedestal, the anchor hole drilled and formed is sealed and protected by an expansion body, so as to prevent debris from falling into the anchor hole during the excavation of the foundation pit, and reduce the workload of later cleaning. Specifically, before the expansion body is placed below, a test is performed at the position of the anchor hole mouth, and the expansion body is driven to expand in the anchor hole until the tightening force of the expansion body on the inner wall of the anchor hole reaches a preset range, so as to determine the expansion degree that the expansion body should have when sealing the anchor hole. The expansion degree can ensure that the expansion body seals the anchor hole securely and tightly, and avoids the phenomenon that the anchor hole is blocked by foreign objects and the inner wall of the anchor hole collapses and deforms when the foundation pit of the pedestal is excavated. After the expansion body is lowered to the preset blocking depth position, the expansion body is driven to expand to the expansion degree in step S2. The present method is reliable in blocking and can effectively protect the formed anchor hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a flow chart of an anchor hole protection method provided by a specific embodiment of the present invention;

[0030] Figure 2 It is a flow chart of using an airbag to protect an anchor hole provided by a specific embodiment of the present invention;

[0031] Figure 3 It is a schematic diagram of placing an airbag in an anchor hole provided by a specific embodiment of the present invention.

[0032] In the figure:

[0033] 1. Anchor hole; 2. Air bag; 3. Inflation tube. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] like Figure 1 As shown, this embodiment provides an anchor hole protection method, which uses an expansion body to seal and protect the formed anchor hole 1. The method of using an expansion body to seal and protect the formed anchor hole 1 includes the following steps:

[0039] S1, measuring and determining the preset plugging depth position of the expansion body in the anchor hole 1;

[0040] S2, placing the expansion body at the opening of the anchor hole 1, and driving the expansion body to expand in the anchor hole 1 until the tightening force of the expansion body on the inner wall of the anchor hole 1 reaches a preset range;

[0041] S3, lowering the expansion body to a preset plugging depth;

[0042] S4. Drive the expansion body to expand to the expansion degree in S2.

[0043] The anchor hole protection method provided in this embodiment is to seal and protect the drilled and formed anchor hole 1 by an expansion body before excavating the foundation pit, so as to prevent debris from falling into the anchor hole 1 during the excavation of the foundation pit, and reduce the workload of later cleaning. Specifically, before the expansion body is placed below, a test is performed at the mouth of the anchor hole 1, and the expansion body is driven to expand in the anchor hole 1 until the tightening force of the expansion body on the inner wall of the anchor hole 1 reaches a preset range, thereby determining the expansion degree that the expansion body should have when sealing the anchor hole 1. The expansion degree can ensure that the expansion body seals the anchor hole 1 securely and tightly, and avoids the phenomenon that the anchor hole 1 is blocked by foreign objects and the inner wall of the anchor hole 1 collapses and deforms when the foundation pit is excavated. After the expansion body is lowered to the preset blocking depth position, the expansion body is driven to expand to the expansion degree in step S2. The present method is reliable in blocking and can effectively protect the formed anchor hole 1.

[0044] It can be understood that the expansion body is made of elastic material so as to adapt to expansion and deformation.

[0045] Embodiment 1

[0046] In the anchor hole protection method provided in this embodiment, the expansion body is an airbag 2, and the airbag 2 is expanded by inflation. Figure 3 As shown, the airbag 2 is provided with an air nozzle, and the airbag 2 is exhausted by loosening the air nozzle. An inflation tube 3 is sleeved on the air nozzle, and an inflation device is connected to the end of the inflation tube 3 away from the airbag 2. The inflation device inflates the airbag 2 through the inflation tube 3. The inflation device can be an air supply device such as an air pump or an air pump. The inflation tube 3 is preferably a hose, which is highly flexible and convenient for connecting the airbag 2 with the inflation device on the construction ground.

[0047] Figure 2 The flowchart shown is when the airbag 2 is used to seal the anchor hole 1. Specifically, in step S2, the airbag 2 is placed at the opening of the anchor hole 1 and inflated until the tightening force of the airbag 2 on the inner wall of the anchor hole 1 reaches a preset range, and the inflation pressure data is recorded. Furthermore, when the airbag 2 is inflated, the tightening and sealing effect can be felt through the resistance encountered during inflation. When the inflation resistance is large, it means that the tightening force of the airbag 2 on the inner wall of the anchor hole 1 has reached a preset range, and the inflation pressure data of the airbag 2 at this time is recorded.

[0048] In step S3, after part of the gas in the airbag 2 is discharged, the airbag 2 is pushed to the preset blocking depth position. Specifically, the airbag 2 is deflated by loosening the air nozzle, but it is not necessary to exhaust all the gas. It only needs to be exhausted until the airbag 2 can move smoothly in the anchor hole 1. After part of the gas is exhausted, the air nozzle is tightened again. In addition, it is not necessary to remove the inflation tube 3 when exhausting the gas. The air nozzle can be loosened or tightened across the inflation tube 3. When lowering the airbag 2, a flexible tool can be used to push it into the anchor hole 1 to avoid damaging the airbag 2.

[0049] In step S4, the airbag 2 is inflated to the recorded inflation pressure value. At this time, the airbag 2 can be tightened in the anchor hole 1, firmly blocking the anchor hole 1, and preventing debris and residues from falling into the deep part of the anchor hole 1 during the excavation of the foundation pit. At the same time, the airbag 2 tightened in the anchor hole 1 can be stably located at the preset blocking depth position and will not move during the subsequent construction process.

[0050] Preferably, the inflation device is provided with a pressure indicating module, which is used to measure and record the inflation pressure of the airbag 2. The construction personnel can obtain the inflation pressure value of the airbag 2 when it is inflated by reading the data displayed by the pressure indicating module. In step S4, the inflation pressure value displayed by the pressure indicating module is observed while inflating. When the inflation pressure value recorded in step S2 is reached, the inflation is stopped. Due to the presence of the air nozzle, the gas will not leak out of the airbag 2 after the inflation is stopped. At this time, the tightening force of the airbag 2 on the inner wall of the anchor hole 1 is within the preset range.

[0051] It is understandable that the inflation pressure of the airbag 2 should be less than the bearing pressure value of the airbag 2 itself (maximum allowable inflation pressure).

[0052] Preferably, step S2 also includes checking the airtightness of the airbag 2. Specifically, after the tightening force of the airbag 2 on the inner wall of the anchor hole 1 reaches a preset range (i.e., after the airbag 2 is tightened to a suitable inflation pressure), the airbag 2 is left stationary for a preset time T, during which the drop in the inflation pressure of the airbag 2 is observed to see whether it exceeds a threshold. If the drop in the inflation pressure of the airbag 2 is 0 or close to 0, it indicates that the airbag 2 and the air nozzle are well sealed. If the drop in the inflation pressure of the airbag 2 exceeds a specified threshold, it indicates that there is a leak on the surface of the airbag 2 or at the air nozzle, and a new airbag 2 can be replaced.

[0053] The airtightness test of the airbag 2 can ensure that the airbag 2 is always at the recorded inflation pressure after being inflated in step S4, and there will be no leakage, thereby avoiding the failure of the sealing effect of the airbag 2 during the foundation pit excavation process.

[0054] In step S1, the preset plugging depth position is determined according to the designed depth h of the foundation pit of the cap, and in step S4, the highest point of the expansion body is lower than the designed depth h of the foundation pit of the cap. Figure 3After the airbag 2 is lowered to the preset plugging depth and inflated, the uppermost end of the airbag 2 should be lower than the design depth h of the foundation pit, that is, below the bottom wall of the foundation pit, to avoid the airbag 2 being scratched by the crushing tool during the excavation of the foundation pit. At the same time, the uppermost end of the airbag 2 should not be too much lower than the design depth h, preferably within 20 mm, which is more convenient for cleaning the debris above the airbag 2 later.

[0055] Optionally, a pressure sensor is attached to the outer wall of the expansion body (the airbag 2 in this embodiment), and the detection value of the pressure sensor is monitored to determine whether the tightening force of the expansion body on the inner wall of the anchor hole 1 is within a preset range. Before construction, the preset range of the tightening force of the expansion body on the inner wall of the anchor hole 1 when the expansion body is firmly sealed can be determined by testing. The diameter size of the anchor hole 1 drilled during specific construction may vary, so the expansion degree of the expansion body when it is firmly sealed in the anchor hole 1 varies, but regardless of the diameter size of the anchor hole 1, the tightening force of the expansion body on the inner wall of the anchor hole 1 should be within a preset range. Specifically in step S2, the detection value of the pressure sensor can be used to intuitively know whether the tightening force of the airbag 2 on the inner wall of the anchor hole 1 reaches the preset range. After reaching the preset range, the inflation pressure at this time can be recorded. Specifically in step S4, when the airbag 2 is inflated to the recorded inflation pressure, it is also possible to simultaneously observe whether the detection value of the pressure sensor is within the preset range.

[0056] Embodiment 2

[0057] The anchor hole protection method provided in this embodiment is different from that in the first embodiment in that:

[0058] The expansion body includes an outer membrane, the inner part of the outer membrane is sealed and filled with gas or liquid, and the upper and lower sides of the outer membrane are respectively sealed and connected with an upper flange plate and a lower flange plate; in step S2, the upper flange plate and the lower flange plate are driven to approach each other to expand the outer membrane until the outer membrane's pressing force on the inner wall of the anchor hole 1 reaches a preset range, and the spacing between the upper flange plate and the lower flange plate is recorded; in step S3, after the upper flange plate and the lower flange plate are driven to move away from each other by a certain distance, the expansion body is lowered to a preset plugging depth position; in step S4, the upper flange plate and the lower flange plate are driven to approach each other to the recorded spacing value. At this time, the pressing force of the outer membrane of the expansion body on the inner wall of the anchor hole 1 can reach a preset range, so as to reliably seal and protect the anchor hole 1.

[0059] Specifically, openings are provided at both the upper and lower ends of the outer membrane, the upper opening is sealed and connected to the upper sealing plate, the lower opening is sealed and connected to the lower sealing plate, the upper sealing plate is fixedly connected to the upper flange plate, and the lower sealing plate is fixedly connected to the lower flange plate. The enclosed space surrounded by the upper sealing plate, the lower sealing plate and the outer membrane is filled with gas or liquid. Furthermore, a driving mechanism (cylinder or oil cylinder) is connected between the upper sealing plate and the lower sealing plate, the housing of the driving mechanism is fixedly mounted on the lower sealing plate, and the telescopic rod is fixedly mounted on the upper sealing plate. When the telescopic rod is driven to extend and retract relative to the housing, the spacing between the upper flange plate and the lower flange plate can be adjusted so that the expansion body can expand to a suitable expansion degree. The control part of the driving mechanism can be set on the construction ground to facilitate the control of the extension and retraction of the telescopic rod.

[0060] In this embodiment, a lowering rod is connected to the upper flange plate, and the expansion body can be lowered to a preset plugging depth position through the lowering rod.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Anchor hole protection method, characterized in that: The method of using an expansion body to seal and protect the formed anchor hole (1) comprises the following steps: S1, measuring and determining a preset plugging depth position of the expansion body in the anchor hole (1); S2, placing the expansion body at the opening of the anchor hole (1), and driving the expansion body to expand in the anchor hole (1) until the tightening force of the expansion body on the inner wall of the anchor hole (1) reaches a preset range; S3, after reducing the expansion degree of the expansion body, lowering the expansion body to the preset plugging depth position; S4. Driving the expansion body to expand to the expansion degree in S2.

2. The anchor hole protection method according to claim 1, characterized in that: The expansion body is an air bag (2); In S2, the airbag (2) is placed at the opening of the anchor hole (1) and inflated until the tightening force of the airbag (2) on the inner wall of the anchor hole (1) reaches a preset range, and the inflation pressure data is recorded; In S3, after part of the gas in the airbag (2) is discharged, the airbag (2) is pushed to the preset blocking depth position; In S4, the airbag (2) is inflated to the recorded inflation pressure value.

3. The anchor hole protection method according to claim 2, characterized in that: The airbag (2) is provided with an air nozzle, and the airbag (2) is exhausted by loosening the air nozzle. An inflation tube (3) is sleeved on the air nozzle, and an inflation device is connected to one end of the inflation tube (3) away from the airbag (2). The inflation device inflates the airbag (2) through the inflation tube (3).

4. The anchor hole protection method according to claim 3, characterized in that: The inflation device is provided with a pressure indicating module, and the pressure indicating module is used to measure and record the inflation pressure of the airbag (2).

5. The anchor hole protection method according to claim 3, characterized in that: The step S2 also includes checking the airtightness of the airbag (2): after the tightening force of the airbag (2) on the inner wall of the anchor hole (1) reaches a preset range, the airbag (2) is left to stand for a preset time T, during which the drop value of the inflation pressure of the airbag (2) is observed to determine whether it exceeds a threshold value.

6. The anchor hole protection method according to claim 3, characterized in that: The inflation tube (3) is a hose.

7. The anchor hole protection method according to claim 1, characterized in that: The expansion body comprises an outer membrane, the inner part of the outer membrane is sealed and filled with gas or liquid, and the upper and lower sides of the outer membrane are respectively sealed and connected with an upper flange plate and a lower flange plate; In S2, the upper flange plate and the lower flange plate are driven to approach each other so as to expand the outer membrane until the tightening force of the outer membrane on the inner wall of the anchor hole (1) reaches a preset range, and the distance between the upper flange plate and the lower flange plate is recorded; In S3, after the upper flange plate and the lower flange plate are driven away from each other, the expansion body is lowered to the preset plugging depth position; In S4, the upper flange plate and the lower flange plate are driven to approach each other to the recorded distance value.

8. The anchor hole protection method according to any one of claims 1 to 7, characterized in that: In the S1, the preset plugging depth position is determined according to the design depth h of the foundation pit of the cap, and in the S4, the highest point of the expansion body is lower than the design depth h of the foundation pit of the cap.

9. The anchor hole protection method according to any one of claims 1 to 7, characterized in that: A pressure sensor is attached to the outer wall of the expansion body, and the detection value of the pressure sensor is monitored to determine whether the tightening force of the expansion body on the inner wall of the anchor hole (1) is within a preset range.

10. The anchor hole protection method according to any one of claims 1 to 7, characterized in that: The expansion body is made of elastic material.

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