A removable advanced pre-stabilized reinforcement pile structure and method

Abstract

This invention discloses a removable pre-stabilization reinforcement pile structure and method, comprising a pile hole drilled in the soil and rock and a removable pipe placed in the pile hole. The removable pipe includes an outer pipe, a middle pipe, and an inner pipe. The outer, middle, and inner pipes are all threaded on their inner and outer sides and are all hollow tubular structures. Under normal working conditions, the removable pipe structure can reinforce the slope soil and rock. After removing the middle pipe, the force transmission path of the removable pipe within the pile structure is cut off, and the pile quickly loses its bearing capacity. The pile will no longer be able to withstand the sliding force generated by the slope and will fail. This removable pipe structure not only meets the pre-stabilization requirements of open-pit mine slopes but also solves the problem of the difficulty in removing existing support structures during widening mining, thereby improving construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of open-pit mine slope treatment technology, and in particular to a removable pre-stabilization reinforcement pile structure and method. Background Technology

[0002] During the side-mounted mining process in open-pit mines, most stopes will form stepped, steep slopes. These slopes are prone to landslides and instability under the disturbance of mining operations and blasting. To improve the stability of stope slopes, the mining industry currently widely adopts methods such as piles, anchor bolts, frame beams, shotcrete, pre-stabilization support, or combined reinforcement to support and reinforce stope slopes.

[0003] While the aforementioned engineering measures can control slope deformation and improve slope stability to some extent, with the continuous expansion of open-pit metal mining in my country, open-pit mines face engineering demands such as mining optimization, recovery of ore resources outside the boundary, and adjustment of development and transportation systems. Many mines require side-expansion mining. Existing conventional slope support methods form permanent support structures within the rock and soil, significantly increasing the difficulty and cost of side-expansion mining, and are unable to meet the functional requirements of temporary support and subsequent dismantling during side-expansion mining in open-pit mines. Summary of the Invention

[0004] (a) Purpose of the invention In view of this, the purpose of this invention is to propose a removable pre-stabilized reinforcement pile structure and method, so as to achieve temporary reinforcement of the mining slope and rapid removal before the expansion mining, thus better meeting the construction needs of open-pit mining expansion.

[0005] (II) Technical Solution To achieve the above technical objectives, the present invention provides a removable pre-stabilized reinforcement pile structure: It includes pile holes drilled in rock and soil and removable pipes placed in the pile holes. The removable pipes include an outer pipe, a middle pipe, and an inner pipe. The outer, middle, and inner pipes are all threaded on their inner and outer sides. The outer, middle, and inner pipes are all hollow tubular structures. The middle pipe is coaxially disposed inside the outer pipe. The threads on the inner wall of the outer pipe and the threads on the outer wall of the middle pipe are mutually engaged and connected. The inner pipe is coaxially disposed inside the middle pipe. The threads on the inner wall of the middle pipe and the threads on the outer wall of the inner pipe are mutually engaged and connected. The outer, middle, and inner pipes are connected by threads to form a coaxial integral structure.

[0006] As a preferred embodiment of the removable pre-stabilized reinforcement pile structure of the present invention, wherein: the threads of the outer, middle, and inner layers of the pipe have the same direction of rotation, the length of the middle layer of the pipe is greater than the length of the outer layer of the pipe, and the length of the inner layer of the pipe is greater than the length of the middle layer of the pipe.

[0007] As a preferred embodiment of the removable pre-stabilized reinforcement pile structure of the present invention, wherein: the gap between the pile hole and the outer side of the outer pipe is filled with pile perimeter concrete, and the inner cavity of the inner pipe is filled with core-filling concrete.

[0008] The present invention also provides a removable pre-stabilization reinforcement method, the specific steps of which are as follows: Step 1: Drilling of pile holes Drilling is carried out at the designed pile hole locations in the soil and rock conditions. After drilling is completed, rock powder and sediment in the hole are removed. Step 2: Installation of removable pipes The inner and middle pipes are threaded together, and then the middle and outer pipes are threaded together, so that the three pipes are coaxially interlocked by the threads to form a detachable pipe. The assembled detachable pipe is then hoisted into the pile hole. Step 3: Pile Forming Construction Filling concrete is poured into the inner cavity of the inner pipe, and pile perimeter concrete is poured into the gap between the pile hole and the outer side of the outer pipe. After the concrete is poured, an advanced pre-stabilized pile structure is formed and then cured. Step 4: Pile Demolition Construction When expanding the slope of a reinforced slope, the pre-stabilized piles are removed. During the removal, the middle pipe is screwed out from the outer and inner pipes. After all the middle pipes in all the piles are screwed out, the failed piles are excavated along with the slope rock mass during the subsequent expansion mining operation.

[0009] As a preferred embodiment of the removable pre-stabilization reinforcement method of the present invention, in step one, the diameter of the pile hole drilled in the soil is larger than the outer diameter of the outer pipe.

[0010] As a preferred embodiment of the removable pre-stabilization reinforcement method of the present invention, in step two, before assembling the outer pipe, the middle pipe and the inner pipe, lubricant is applied to the threads on the inner and outer sides of the middle pipe, the threads on the outer side of the inner pipe and the threads on the inner side of the outer pipe.

[0011] As a preferred embodiment of the removable pre-stabilization reinforcement method of the present invention, in step two, the removable pipe is kept vertical and lowered steadily during the process of being hoisted into the pile hole.

[0012] As a preferred embodiment of the removable pre-stabilization reinforcement method of the present invention, in step three, the filling speed of the core concrete and the pile perimeter concrete is controlled during filling to avoid displacement of the removable pipe due to excessive speed or uneven filling around the pile.

[0013] As a preferred embodiment of the removable pre-stabilization reinforcement method of the present invention, in step three, after the core filling concrete and pile perimeter concrete have been cured and the pile has the bearing capacity, the slope reinforcement work begins to be carried out to ensure the stability of the reinforced slope under excavation or blasting disturbance conditions.

[0014] As a preferred embodiment of the removable pre-stabilization reinforcement method of the present invention, in step four, when all the intermediate pipes in all the piles are unscrewed, the force transmission path of the removable pipes in the pile structure is cut off, and the pile will be unable to continue to bear the sliding force generated by the slope and will be damaged.

[0015] As can be seen from the above technical solutions, this application has the following beneficial effects: the removable pipe composed of the outer pipe, the middle pipe and the inner pipe can strengthen the slope rock and soil under normal working conditions. After the middle pipe is removed, the force transmission path of the removable pipe in the pile structure is cut off, the pile quickly loses its bearing capacity, and the pile will be unable to continue to bear the sliding force generated by the slope and will be damaged. This makes the removable pipe not only meet the needs of pre-stabilization of open-pit mine slopes, but also solve the problem that the existing support structure is difficult to remove during the expansion mining, thereby improving construction efficiency and having strong engineering application value. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 A top view of a removable pre-stabilized reinforcement pile structure provided by the present invention; Figure 2 A side sectional view of a removable pre-stabilized reinforcement pile structure provided by the present invention; Figure 3 The flowchart illustrates a removable pre-stabilization reinforcement method provided by this invention.

[0018] Attached diagram descriptions: 1. Pile perimeter concrete; 2. Removable pipe; 21. Outer pipe; 22. Middle pipe; 23. Inner pipe; 24. Thread; 3. Core-filling concrete; 4. Pile hole. Detailed Implementation

[0019] The following description is exemplary in nature and is not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. The figures are merely schematic representations of the concept and principles of embodiments of this disclosure and do not necessarily show the specific dimensions and scale of the various embodiments of this disclosure. Certain details or structures of embodiments of this disclosure may be exaggerated in particular portions of certain figures.

[0020] Reference Figure 1-3 : Example 1 A removable pre-stabilized reinforcement pile structure includes a pile hole 4 drilled in the soil or rock and a removable pipe 2 placed inside the pile hole 4. The removable pipe 2 includes an outer pipe 21, a middle pipe 22, and an inner pipe 23. Threads 24 are provided on both the inner and outer sides of the outer pipe 21, the middle pipe 22, and the inner pipe 23. The outer pipe 21, the middle pipe 22, and the inner pipe 23 are all hollow tubular structures. The middle pipe 22 is coaxially arranged inside the outer pipe 21. The threads 24 on the inner wall of the outer tube 21 and the threads 24 on the outer wall of the middle tube 22 are connected to each other. The inner tube 23 is coaxially arranged inside the middle tube 22. The threads 24 on the inner wall of the middle tube 22 and the threads 24 on the outer wall of the inner tube 23 are connected to each other. The outer tube 21, the middle tube 22, and the inner tube 23 are connected by threads to form a coaxial integral structure. The threads 24 on the inner and outer sides of the outer tube 21, the middle tube 22, and the inner tube 23 have the same thread direction.

[0021] It should be noted that since the threads 24 on the inner and outer sides of the outer pipe 21, the middle pipe 22, and the inner pipe 23 have the same direction of rotation, the three layers of pipe can be synchronously tightened by rotating in the same direction during assembly. When disassembling, the middle pipe 22 can be unscrewed by rotating in the opposite direction. It is worth adding that the leads of the threads 24 on the inner and outer sides of the outer pipe 21, the middle pipe 22, and the inner pipe 23 are equal. Equal leads ensure that the three layers of pipe can be synchronously fed axially during rotational assembly and disassembly, avoiding thread misalignment or jamming caused by inconsistent feed speeds.

[0022] Among them, the length of the middle pipe 22 is greater than the length of the outer pipe 21, the length of the inner pipe 23 is greater than the length of the middle pipe 22, the gap between the pile hole 4 and the outer side of the outer pipe 21 is filled with pile perimeter concrete 1, and the inner cavity of the inner pipe 23 is filled with core-filling concrete 3.

[0023] It should be noted that, since the length of the middle pipe 22 is greater than the length of the outer pipe 21, and the length of the inner pipe 23 is greater than the length of the middle pipe 22, this structural design with increasing length makes the ends of the three pipes staggered in a stepped manner. The purpose of this design is that, during the pile demolition stage, the stepped end structure makes it easier to identify the end position of each pipe layer, and also avoids the problem of difficulty in applying force separately due to the flush ends of each pipe layer.

[0024] Example 2 A removable pre-stabilization reinforcement method, based on Embodiment 1, specifically includes the following steps: Step 1: Drilling of pile holes Drilling should be carried out at the designed pile hole 4 position. The diameter of the borehole should be larger than the outer diameter of the outer pipe. After drilling is completed, the rock powder and sediment in the hole should be removed. Step 2: Installation of removable pipes Connect the inner pipe 23 and the middle pipe 22 with threads, and then connect the middle pipe 22 and the outer pipe 21 with threads, so that the three pipes are coaxially interlocked into a whole by threads. Before assembly, apply lubricant to the threads 24 to avoid thread jamming during disassembly. Then, hoist the assembled removable pipe 2 into the pile hole 4. Keep it vertical and lower it steadily during the hoisting process to avoid collision with the hole wall and cause the hole to collapse. Step 3: Pile Forming Construction Filling concrete 3 is poured inside the inner pipe 23, and pile perimeter concrete 1 is poured in the gap between the pile hole 4 and the outer side of the outer pipe 21. When filling the concrete, avoid excessive speed or uneven filling around the pile to prevent displacement of the removable pipe 2. After the concrete is poured, wrap the removable pipe 2 to form an advanced pre-stabilized pile structure and carry out curing. After the curing is completed and the pile has the bearing capacity, the slope reinforcement work is started to ensure the stability of the reinforced slope under excavation or blasting disturbance conditions. Step 4: Pile Demolition Construction When it is necessary to expand the slope for mining, the pre-stabilized piles should be removed first. During the removal, the intermediate pipe 22 should be unscrewed along the thread. After all the intermediate pipes 22 in all the piles are unscrewed, the force transmission path of the removable pipes 2 in the pile structure is cut off. The piles will no longer be able to bear the sliding force generated by the slope and will be damaged. At this time, the expansion mining operation can be carried out. The failed piles are excavated together with the slope rock mass and do not need to be removed or blasted separately.

[0025] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A removable pre-stabilized reinforcement pile structure, comprising a pile hole (4) drilled in the soil or rock and a removable pipe (2) placed in the pile hole (4), characterized in that, The removable pipe (2) includes an outer pipe (21), a middle pipe (22), and an inner pipe (23). The outer pipe (21), the middle pipe (22), and the inner pipe (23) are all threaded (24) on their inner and outer sides. The outer pipe (21), the middle pipe (22), and the inner pipe (23) are all hollow tubular structures. The middle pipe (22) is coaxially disposed inside the outer pipe (21). 1) The inner wall thread (24) is connected to the outer wall thread (24) of the intermediate pipe (22). The inner layer pipe (23) is coaxially disposed inside the intermediate pipe (22). The inner wall thread (24) of the intermediate pipe (22) is connected to the outer wall thread (24) of the inner layer pipe (23). The outer layer pipe (21), intermediate pipe (22), and inner layer pipe (23) are connected by threads to form a coaxial integral structure.

2. The removable pre-stabilized reinforcement pile structure according to claim 1, characterized in that, The threads (24) on the inner and outer sides of the outer tube (21), the middle tube (22), and the inner tube (23) have the same direction of rotation. The length of the middle tube (22) is greater than the length of the outer tube (21), and the length of the inner tube (23) is greater than the length of the middle tube (22).

3. The removable pre-stabilized reinforcement pile structure according to claim 1, characterized in that, The gap between the pile hole (4) and the outer side of the outer pipe (21) is filled with pile perimeter concrete (1), and the inner cavity of the inner pipe (23) is filled with core-filling concrete (3).

4. A removable pre-stabilization reinforcement method, comprising the removable pre-stabilization reinforcement pile structure as described in any one of claims 1-3, wherein the specific steps are as follows: Step 1: Drilling of pile holes Drilling is carried out at the location of the designed pile hole (4) in the soil and rock. After drilling is completed, rock powder and sediment in the hole are removed. Step 2: Installation of removable pipes The inner pipe (23) and the middle pipe (22) are threaded together, and the middle pipe (22) and the outer pipe (21) are threaded together so that the three pipes are coaxially interlocked by the threads to form a detachable pipe (2). Then the assembled detachable pipe (2) is hoisted into the pile hole (4). Step 3: Pile Forming Construction Filling concrete (3) is poured into the inner cavity of the inner pipe (23), and pile perimeter concrete (1) is poured into the gap between the pile hole (4) and the outer side of the outer pipe (21). After the concrete is poured, an advanced pre-stabilized pile structure is formed and cured. Step 4: Pile Demolition Construction When expanding the slope, the pre-stabilized piles are removed. During the removal, the middle pipe (22) is screwed out from the outer pipe (21) and inner pipe (23). After all the middle pipes (22) in all the piles are screwed out, the failed piles are excavated together with the slope rock mass during the subsequent expansion mining operation.

5. The removable pre-stabilization reinforcement method according to claim 4, characterized in that, In step one, the diameter of the pile hole (4) drilled in the soil and rock is larger than the outer diameter of the outer pipe (21).

6. The removable pre-stabilization reinforcement method according to claim 4, characterized in that, In step two, before assembling the outer tube (21), the middle tube (22) and the inner tube (23), lubricant is applied to the threads (24) on the inner and outer sides of the middle tube (22), the threads (24) on the outer side of the inner tube (23) and the threads (24) on the inner side of the outer tube (21).

7. The removable pre-stabilization reinforcement method according to claim 4, characterized in that, In step two, the removable pipe (2) is lowered vertically and steadily into the pile hole (4).

8. The removable pre-stabilization reinforcement method according to claim 4, characterized in that, In step three, the filling speed of the core concrete (3) and the pile perimeter concrete (1) is controlled during filling to avoid displacement of the removable pipe (2) due to excessive speed or uneven filling around the pile.

9. The removable pre-stabilization reinforcement method according to claim 4, characterized in that, In step three, after the core filling concrete (3) and pile perimeter concrete (1) have been cured, the pile body has the bearing capacity and then enters the slope reinforcement work state to ensure the stability of the reinforced slope under excavation or blasting disturbance conditions.

10. A removable pre-stabilization reinforcement method according to claim 4, characterized in that, In step four, when all the intermediate pipes (22) in all the piles are unscrewed, the force transmission path of the removable pipes in the pile structure is cut off, and the pile will be unable to continue to bear the sliding force generated by the slope and will be damaged.

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