Pile foundation hole forming equipment and construction method

Abstract

The invention discloses pile foundation hole forming equipment and a construction method, and relates to the technical field of building construction.The equipment comprises a safety barrel used for providing a safety construction space for constructors, and the periphery of the lower half portion of the safety barrel is wrapped with an annular air bag capable of being inflated and deflated; the combined supporting frame is used for supporting the hole wall and comprises a plurality of layers of circular splicing pieces which are sequentially arranged from top to bottom, every two adjacent layers of circular splicing pieces are connected through a connecting piece, and the connecting piece on the bottommost layer is fixedly connected with the top plate; the hoisting system comprises a hoisting support, a first hoisting mechanism used for hoisting the material barrel and constructors, and a second hoisting mechanism used for hoisting the safety barrel. By the adoption of the safety barrel capable of moving up and down, the modular combined supporting frame and the annular air bag, the safety barrel gradually moves downwards through alternate inflation and deflation during construction, a three-dimensional supporting system is formed in cooperation with the combined supporting frame, other protection is not needed, safety and construction efficiency are remarkably improved, and the device is suitable for construction of non-underwater pile foundations with the diameter being 1 m or above.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, in particular to a pile foundation hole-forming device and a construction method. Background Art

[0002] In the field of construction engineering, pile foundation drilling is a key step in foundation construction, and its process selection directly affects the project quality and construction safety. The current mainstream process has the following technical defects:

[0003] (1) Manual excavation is unsafe and prone to collapse accidents. Concrete retaining walls are required, which results in a long construction period and high costs.

[0004] (2) Mechanical drilling equipment is bulky and not suitable for complex terrain. It requires a large amount of mud, which increases costs and damages the environment.

[0005] Therefore, there is an urgent need to develop a new pore-forming technology that is safe, economical and adaptable. Summary of the Invention

[0006] The purpose of the present invention is to provide a pile foundation drilling equipment and construction method to solve the problems existing in the above-mentioned prior art and achieve coordinated optimization of construction safety, cost-effectiveness and environmental friendliness.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] A pile foundation drilling device, characterized by comprising:

[0009] The safety barrel is used to provide a safe construction space for construction workers. The safety barrel has an opening at the bottom and a top plate at the top. The top plate has an opening for construction workers and the barrel to pass through. The outer periphery of the lower half of the safety barrel is wrapped with an inflatable and deflable annular airbag.

[0010] A combined support frame, used to support the hole wall, including multiple layers of circular splicing pieces connected in sequence from top to bottom, wherein the circular splicing pieces at the bottom layer are connected to the top plate;

[0011] The lifting system comprises a lifting bracket and a first lifting mechanism for lifting the material bucket and construction workers, and a second lifting mechanism for lifting the safety bucket and the combined support frame.

[0012] In an exemplary embodiment, the safety barrel is composed of a lower safety barrel and an upper safety barrel that are detachably connected, and the outer circumference of the lower safety barrel is wrapped with the annular airbag.

[0013] In an exemplary embodiment, the circular splicing piece is formed by splicing a plurality of arc-shaped unit pieces distributed circumferentially, and each of the arc-shaped unit pieces includes at least two layers of arc-shaped alloy plates and short alloy bars connecting the arc-shaped alloy plates of adjacent layers, and long alloy bars connecting the arc-shaped unit pieces of adjacent layers.

[0014] In an exemplary embodiment, the arc-shaped alloy plate is provided with a mounting groove and a positioning connection hole, wherein:

[0015] The two mounting grooves are provided at both ends of the arc-shaped alloy plate in the circumferential direction, and are used for allowing the long alloy bars of the circular splicing pieces of this layer to pass through and be fixed;

[0016] One of the positioning connection holes is arranged on the center line between the two installation grooves for allowing the long alloy bars of the circular splicing pieces of the adjacent layers to pass through. The positioning connection hole is arranged to allow two of the long alloy bars to pass through with a margin for movement.

[0017] In an exemplary embodiment, a limiting block is provided at the lower end of the long alloy bar to prevent the long alloy bar from separating from the arc-shaped alloy plate.

[0018] In an exemplary embodiment, a monitoring system is further included, including a lighting device and a video monitoring module, wherein the lighting device is arranged inside the safety barrel and on the combined support frame, and the video monitoring module includes a camera device and a display device, wherein the camera device is arranged inside the safety barrel and on the combined support frame, and the display device is arranged outside the pile hole and is connected to the camera device signal.

[0019] The present invention also provides a pile foundation drilling method, which uses the above-mentioned pile foundation drilling equipment and includes the following steps:

[0020] Step 1: After the site is leveled, an initial hole section is excavated, and the safety barrel provided with the annular airbag is lowered;

[0021] Step 2: Inflate the annular airbag to a predetermined pressure, stabilize the hole wall, and then continue excavating in layers;

[0022] Step 3: The safety barrel is gradually moved downward by alternately inflating and deflating the air, and the combined support frame is installed layer by layer at the orifice;

[0023] Step 4: After reaching the designed depth, the pressure is released, the safety bucket is lifted out, and the combined support frame is removed to complete the hole drilling.

[0024] In an exemplary embodiment, in step 2, when excavating in layers, the excavation depth of each layer is less than the height of the annular airbag.

[0025] In an exemplary embodiment, the status inside the hole is observed in real time through a video monitoring module during the construction process.

[0026] In an exemplary embodiment, in step 3, when the soil quality is poor, the hole wall is reinforced before continuing excavation.

[0027] Compared with the prior art, the present invention has achieved the following technical effects:

[0028] By integrating the dynamic pressure of the annular airbag of the safety barrel and the multi-layer coordinated support of the combined support frame, a dual protection system of "active pressurization of the airbag + passive load-bearing of the rigid support" is formed, which not only avoids the maintenance waiting time of the traditional concrete retaining wall, but also realizes support as the excavation is carried out through modular layered circular splicing parts; the split lifting system including the first lifting mechanism and the second lifting mechanism ensures that the lifting and lowering of personnel, materials and equipment do not interfere with each other. Combined with the dedicated channel design of the top plate of the safety barrel, the working efficiency in a small space is significantly improved, and the overall coordinated optimization of construction safety, cost economy and environmental friendliness is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a structural schematic diagram of the pile foundation hole-forming equipment of the present invention;

[0031] Figure 2 for Figure 1 A top view of the middle circular piece;

[0032] Figure 3 for Figure 2 Side view of

[0033] Figure 4 for Figure 2 Top view of the middle arc unit;

[0034] Figure 5 for Figure 3 Top view of the middle curved alloy plate;

[0035] Figure 6 A schematic diagram showing the circumferential dimension requirements for positioning connection holes, long alloy bars, limit blocks and other connection parts;

[0036] Among them, 1. Safety barrel; 2. Top plate; 3. Material barrel; 4. Opening; 5. Annular airbag; 6. Circular splicing piece; 8. Lifting bracket; 10. Lighting device; 11. Camera device; 12. Display device; 13. Arc-shaped unit component; 14. Air pump; 15. Winch; 16. Power supply; 17. Arc-shaped alloy plate; 18. Short alloy bar; 19. Long alloy bar; 20. Installation groove; 21. Positioning connection hole; 22. Limit block. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. People familiar with this technology can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] The purpose of the present invention is to provide a pile foundation drilling equipment and construction method to solve the problems existing in the prior art and achieve coordinated optimization of construction safety, cost-effectiveness and environmental friendliness.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Example 1

[0041] Please refer to Figures 1 to 2 This embodiment provides a pile foundation drilling device, comprising a safety bucket 1, a combined support frame, and a lifting system. During manual excavation, the safety bucket 1 is positioned within the hole to provide a safe working space for construction workers. The combined support frame is mounted above the safety bucket 1 to support the hole wall and prevent potential collapse. The lifting system is used to transport the safety bucket 1, the combined support frame, the material bucket 3 for transporting excavated soil, and the construction workers. The outer diameters of the combined support frame and safety bucket 1 should be slightly smaller than the designed diameter of the pile hole, allowing the combined support frame and safety bucket 1 to move freely up and down.

[0042] Specifically, the safety barrel 1 has an open bottom and a top plate 2 above it, which features an opening 4 for construction workers and a material bucket 3 to pass through. An inflatable annular airbag 5 surrounds the outer periphery of the lower half of the safety barrel 1. This airbag 5 is connected to an air pump 14 outside the pile hole via an inflation pipe. The inflation of the airbag 5 applies radial pressure to the hole wall, compacting and stabilizing the surrounding soil and forming a dynamic pressure support layer. During subsequent layered excavation, the downward movement of the safety barrel 1 is controlled by alternating inflation and deflation. Simultaneously, modular support frames are continuously installed at the hole mouth, forming a three-dimensional support system that fully covers the entire hole wall and provides immediate counterforce to handle localized collapses. In simple terms, in the event of a hole wall collapse, the modular support frames provide a large-scale grid-like support system, preventing large-scale collapse from blocking the pile hole. Any soil or rock that falls into the modular support frames is protected by the safety barrel 1 and prevents it from entering the interior and causing harm to workers.

[0043] As a preferred embodiment of this embodiment, the safety barrel 1 comprises a detachably connected lower and upper sections. The upper section has a top plate 2, which is preferably welded to the upper section. The lower section is surrounded by an annular airbag 5. The lower and upper sections are connected by a flange equipped with a quick-locking mechanism.

[0044] The split structure decomposes the safety bucket 1 into a lower load-bearing section and an upper functional section, achieving functional decoupling through modular design: the lower safety bucket cooperates with the annular airbag to focus on borehole wall pressure control, while the upper safety bucket provides personnel access and equipment integration interfaces, such as the monitoring system described below. This not only meets the need for gradual downward movement of the safety bucket 1 during layered excavation, but also reduces the difficulty of overall lifting. At the same time, the split design allows for local repair and replacement, avoiding overall structural failure due to local faults, and achieving an optimal balance between construction efficiency, safety redundancy, and maintenance economy. In addition, the overall height of the safety bucket 1 is set to about two meters. Although it is made of lightweight materials such as aluminum alloy, its overall weight is still heavy, making it impossible for one person to carry and operate it. By dividing the safety bucket 1 into two sections, the lower safety bucket and the upper safety bucket, the minimum unit weight is reduced, so that in actual work, a single person can independently carry the lower and upper safety buckets.

[0045] Please refer to Figure 1 and Figure 3 The combined support frame includes multiple layers of circular splicing pieces 6 connected in sequence from top to bottom, and the circular splicing piece 6 at the bottom layer is connected to the top plate 2 of the safety barrel 1.

[0046] Please refer to Figure 2 In this embodiment, the circular splicing piece 6 is formed by splicing a plurality of arc-shaped unit elements 13 distributed circumferentially. For example, each circular splicing piece 6 is formed by splicing two semicircular arc-shaped unit elements 13.

[0047] Please refer to Figure 3 Each arc-shaped unit element 13 includes at least two layers of arc-shaped alloy plates 17 and short alloy bars 18 connecting adjacent layers of arc-shaped alloy plates 17 , as well as long alloy bars 19 connecting adjacent layers of arc-shaped unit elements 13 .

[0048] Please refer to Figure 4 The arc-shaped alloy plate 17 has a certain width in the radial direction of the pile hole. The short alloy bars 18 are arranged on the radial inner and outer sides of the arc-shaped alloy plate 17 and are connected to the arc-shaped alloy plate 17 through fasteners, thereby connecting at least two layers of arc-shaped alloy plates 17 into a whole.

[0049] Please refer to Figure 3 The long alloy strip 19 is used to simultaneously pass through the two adjacent arc-shaped alloy plates 17 of the circular splicing pieces 6 of the two adjacent layers and is fixed by fasteners, thereby realizing the connection of the circular splicing pieces 6 of the adjacent layers.

[0050] For details, please refer to Figure 5 , the arc-shaped alloy plate 17 is provided with a mounting groove 20 and a positioning connection hole 21, wherein:

[0051] Two mounting grooves 20 are provided at both circumferential ends of the arc-shaped alloy plate 17 for allowing the long alloy bars 19 of the circular splicing piece 6 of this layer to pass through and be fixed; when multiple arc-shaped unit components 13 are spliced ​​together to form a circular splicing piece 6, the mounting grooves 20 at both ends of the adjacent arc-shaped alloy plates 17 are combined to form a mounting hole, and the two long alloy bars 19 fixed in the two mounting grooves 20 are respectively attached to each other.

[0052] A positioning connection hole 21 is set on the center line between the two mounting grooves 20, for allowing the extended part of the long alloy strip 19 of the adjacent layer of circular splicing pieces 6 - that is, the two long alloy strips 19 fixed in the two mounting grooves 20 and attached to each other - to pass through. In this way, on the one hand, the splicing of multiple arc-shaped unit components 13 is achieved through the positioning connection hole 21, and on the other hand, the connection of adjacent layers of circular splicing pieces 6 is achieved through the long alloy strip 19.

[0053] As a preferred solution of this embodiment, the positioning connection holes 21 are configured to allow two long alloy bars 19 to pass through with room for movement. This configuration, rather than having the long alloy bars 19 fixedly connected to the positioning connection holes 21, is because when multiple layers of circular splicing pieces 6 are installed layer by layer from bottom to top, if a completely fixed connection method is used, the cumulative installation of multiple layers may cause the combined support frame to gradually tilt. The circular splicing pieces 6 at the bottom are all located in the pile holes, and the staff assembling the circular splicing pieces 6 outside the holes cannot adjust them, resulting in an inability to correct them later. However, by providing the long alloy bars 19 with room for movement within the positioning connection holes 21, the entire combined support frame can move like the human spine. Even if the installation is found to be tilted later, the staff outside the holes can adjust it by applying force outside the holes.

[0054] Similarly, the top plate 2 of the safety barrel 1 is also provided with positioning connection holes 21 that allow two long alloy bars 19 to pass through and have room for movement. The number of positioning connection holes 21 is consistent with the number of arc-shaped unit elements 13 contained in each layer of circular splicing pieces 6. The long alloy bars 19 of the bottom layer of circular splicing pieces 6 are connected to the safety barrel 1 by passing through the positioning connection holes 21 on the top plate 2.

[0055] When the adjacent circular splicing pieces 6 are installed, the mounting grooves 20 on the arc-shaped alloy plates 17 of the current circular splicing pieces 6 correspond to the positioning connection holes 21 on the arc-shaped alloy plates 17 of the adjacent circular splicing pieces 6, for the same long alloy strip 19 to pass through. Figure 3 As shown, the staggered arrangement of the long alloy bars 19 and the arc-shaped unit elements 13 of the circular splicing pieces 6 of adjacent layers is naturally achieved, so that the combined support frame as a whole forms a criss-cross grid support system.

[0056] Furthermore, the lower end of the long alloy bar 19 is provided with a limit block 22 to prevent the long alloy bar 19 from detaching from the arc-shaped alloy plate 17. The lower end of a single long alloy bar 19 with a limit block 22 can pass through the positioning connection hole 21, while the lower ends of two single long alloy bars 19 with a limit block 22 merged together cannot pass through the positioning connection hole 21. Therefore, during installation, the first arc-shaped unit component 13 needs to be installed first. When installing the adjacent second arc-shaped unit component 13, the first arc-shaped unit component 13 needs to be moved slightly to the side so that the positioning connection hole 21 exposes enough space for the long alloy bar 19 with the limit block 22 of the second arc-shaped unit component 13 to pass through. After installation, the two long alloy bars 19 that are attached to each other are located in the middle of the positioning connection hole 21.

[0057] The purpose of this arrangement is to prevent the occurrence of a gradual tilt of the combined support frame during the subsequent excavation and installation of the pile foundation hole method described below. When the annular airbag 5 releases pressure, causing the safety barrel 1 and the combined support frame to move downward under their own weight, a circular assembly 6 of a certain layer may become stuck on the hole wall and unable to fall freely. At this time, the stopper 22 at the bottom of the long alloy bar 19 comes into play. The curved alloy plate 17 of the next layer of circular assembly 6 will abut against the stopper 22 after it falls, exerting downward tension on the stuck circular assembly 6, thereby driving it downward.

[0058] Among them, the arc-shaped alloy plate 17, the short alloy bars 18 and the long alloy bars 19 are all made of light alloy, such as aluminum alloy. In this way, only two people are needed on the construction site, one to dig below and the other to install the combined support frame above.

[0059] The lifting system includes a lifting bracket 8, a first lifting mechanism and a second lifting mechanism (not shown in the figure). The first lifting mechanism includes a winch 15, which is used to lift the material bucket 3 and construction personnel; the second lifting mechanism is used to lift the safety bucket 1 and the combined support frame above it out of the pile hole after excavation reaches the designed depth.

[0060] This embodiment also includes a monitoring system for real-time monitoring of construction status. The system comprises an illumination device 10 and a video monitoring module. The illumination device 10 is located within the safety barrel 1 and on the combined support frame. The video monitoring module comprises a camera 11 and a display device 12. The camera 11 is located within the safety barrel 1 and on the combined support frame. The display device 12 is located outside the pile hole and is signal-connected to the camera 11. A battery power supply 16 is also located outside the pile hole to power electrical equipment such as the illumination device 10, camera 11, display device 12, air pump 14, and winch 15.

[0061] The lighting device 10 and the camera device 11 integrated on the top of the safety barrel 1 collect the working scenes in the hole in real time, and timely identify abnormal signs such as cracks in the hole wall and water seepage through visual supervision. Combined with the linkage analysis of the airbag pressure data, risk warnings are provided to construction personnel; at the same time, sufficient lighting ensures the visibility of the operation, reduces the operating error rate, and forms a full-process safety management and control closed loop of "real-time monitoring-intelligent warning-rapid response", which significantly improves the risk prevention and control capabilities under complex working conditions.

[0062] Example 2

[0063] The present invention also provides a pile foundation drilling method, which uses the above-mentioned pile foundation drilling equipment and includes the following steps:

[0064] Step 1: After the site is leveled, an initial hole section is excavated, and the safety barrel 1 provided with the annular airbag 5 is lowered;

[0065] Specifically, weeds and debris within 5m around the pile position should be removed and compacted;

[0066] Use instruments to accurately lay out and calibrate the pile center position to ensure accuracy;

[0067] and assembling a certain number of arc-shaped unit elements 13;

[0068] Use a manual shovel and hopper to start digging until the depth is slightly greater than the height of the safety bucket 1;

[0069] Place the safety barrel 1 into the hole, use the centering instrument to adjust the center of the barrel to coincide with the pile center, and fix it with a fixing device.

[0070] When the safety barrel 1 is composed of a lower safety barrel and an upper safety barrel that are detachably connected:

[0071] Step 101: When the manual excavation reaches a depth slightly greater than the height of the lower safety bucket, the lower safety bucket with the airbag is placed into the hole, the center of the bucket is adjusted to coincide with the pile center using an alignment tool, and then fixed with a fixing device;

[0072] Step 102: Open the air inlet valve, inflate the annular airbag 5 to a predetermined pressure, and continue digging after stabilizing the hole wall;

[0073] Specifically, manual excavation is adopted in combination with soil transportation by a winch 15 , and the excavation depth is slightly less than the height of the annular airbag 5 .

[0074] Step 103: Open the deflation valve of the annular airbag 5 and slowly deflate the air. The lower safety barrel begins to move downward under its own weight. After reaching the bottom of the hole, the upper safety barrel is docked with the lower safety barrel and connected via fasteners.

[0075] Step 2: Inflate the annular airbag 5 to a predetermined pressure, stabilize the hole wall, and then continue excavating in layers;

[0076] Step 3: Alternately inflate and deflate the annular airbag 5 to gradually move the safety bucket 1 downwards. At the same time, composite support frames are installed layer by layer at the hole mouth to support and protect the entire hole wall. If the soil quality is poor, the hole wall is reinforced before continuing excavation.

[0077] Specifically include:

[0078] 1) Charge and discharge cycle operation

[0079] Preparation for downward movement: When the excavation depth reaches 0.8 times the height of the annular airbag 5, open the air release valve of the annular airbag 5 and slowly release the air;

[0080] The barrel moves downward: when the air pressure in the annular airbag 5 drops to a certain value, the safety barrel 1 and the combined support frame will begin to move downward under the action of their own weight;

[0081] Reset and pressurization: After the safety barrel 1 is lowered to the bottom of the hole, it is centered, fixed, and then re-inflated to the working pressure.

[0082] 2) Installation of combined support frame

[0083] Displacement installation: The installation groove 20 on the arc-shaped alloy plate 17 of the circular splicing piece 6 of this layer corresponds to the positioning connection hole 21 on the arc-shaped alloy plate 17 of the circular splicing piece 6 of the adjacent layer, for the same long alloy bar 19 to pass through;

[0084] Install lighting and monitoring devices: Install lighting devices 10 and camera devices 11 on the top plate 2 and the combined support frame of the safety barrel 1, and set a display device 12 at the hole to ensure that there is no blind spot in lighting and camera;

[0085] Dynamic control: To ensure safety and ease of construction, the top of the combined support frame must be close to the ground, but not higher than the ground.

[0086] Step 4: After reaching the designed depth, the pressure is released, the safety bucket 1 and the combined support frame are hoisted out, and the combined support frame is removed to complete the hole drilling;

[0087] Specifically include:

[0088] 1) Air pressure requirements

[0089] After reaching the designed depth, the annular airbag 5 is inflated to a predetermined pressure and maintained for a specified time;

[0090] 2) Equipment dismantling

[0091] Open the deflation valve of the annular airbag 5 to release the pressure to normal pressure, and use the second lifting mechanism to lift out the safety bucket 1. During the process of lifting out the safety bucket 1, the combined support frame slowly moves up, and the combined support frame is removed layer by layer at the hole mouth until the safety bucket 1 is lifted out and the hole-making work is completed.

[0092] It should be noted that:

[0093] 1. Function of the annular airbag 5

[0094] (1) When inflating, pressure is applied to the hole wall, making the hole wall denser and more stable, and less likely to collapse;

[0095] (2) When inflated, the pressure on the hole wall increases → the friction force increases → it is greater than the deadweight of the safety barrel 1 and the combined support frame → it can be fixed on the hole wall;

[0096] (3) When the air is released, the air pressure decreases → the friction force decreases → becomes smaller than the dead weight of the safety barrel 1 and the combined support frame → the safety barrel gradually moves downward.

[0097] 2. Composition of combined support frame

[0098] The basic parts include: arc-shaped alloy plates 17, short alloy bars 18, long alloy bars 19, limit blocks 22, screw nuts and other fasteners. A certain number of the above five constitute an arc-shaped unit component 13, and several arc-shaped unit components 13 are assembled to form a circular splicing component 6. Several layers of circular splicing components 6 are stacked and connected to form a combined support frame.

[0099] 3. The connection method of inserting the two long alloy bars 19 of the limit block 22 into the same positioning connection hole 21 is called plug-in connection in this embodiment. In this embodiment, the connection of the arc-shaped unit elements 13 adopts the plug-in connection.

[0100] (1) Function:

[0101] a. Achieved by a number (two in this embodiment) of arc-shaped unit elements 13 spliced ​​into a circular splicing member 6 (embodied in the horizontal plane);

[0102] b. Achieve a connection between the layers of the circular splicing piece 6 (indicated in the longitudinal direction);

[0103] c. The bottom circular splicing piece 6 is connected to the top plate 2 in the same way.

[0104] (2) Features: Do not fix the connection,

[0105] (3) Requirements: Construction requirements must ensure that the two long alloy bars 19 that are bonded together to the limit block 22 can be inserted or pulled out in sequence, and cannot be inserted or pulled out at the same time. In order to meet the above construction requirements, certain matching dimensions must be met, such as Figure 6 The following are the circumferential dimension requirements for the connector:

[0106] Set the size of the positioning connection hole 21 to A, the size of the long alloy bar 19 to B, and the size of the limit block 22 to C. The size requirements are as follows:

[0107] a.2B+2C>A

[0108] b.2B+C

[0109] 4. Assembly sequence

[0110] The arc-shaped unit element 13 includes a limit block 22 and is assembled outside the hole. Each long alloy bar 19 can only be provided with a limit block 22 at one end, otherwise the plug-in connection cannot be achieved;

[0111] The plug-in connection between the arc-shaped units 13 is completed in the hole.

[0112] ​In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only used to facilitate the description of the present invention, and do not imply or require that the device or element referred to must have a specific orientation or construction method, and therefore should not be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the objects of description and should not be understood as limiting the importance or order, and the features defined by such terms may explicitly or implicitly include one or more such features. Unless otherwise specified, "multiple" in the description of the present invention refers to two or more.

[0113] The terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly defined, including but not limited to fixed connection, detachable connection or one-piece connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two elements. Those skilled in the art can understand their meaning based on the specific technical solution. The fixed connection involved in the present invention, unless otherwise stated, includes both detachable fixed connections (such as bolts, screw connections) and non-detachable fixed connections (such as riveting, welding), and may also include an integral structure achieved by an one-piece molding process (such as casting) (except for those that obviously cannot be one-piece molded).

[0114] Unless otherwise stated, the terms used in any technical solution disclosed in the present invention to express positional relationships or shapes all cover states or shapes that are approximate, similar or close thereto.

[0115] Any component provided by the present invention may be assembled from multiple separate components, or may be a separate component manufactured by an integral molding process.

[0116] It should be noted that the structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0117] In the embodiments of the present application, the same reference numerals are used to represent the same component or the same part.

[0118] Adaptive changes based on actual needs are all within the scope of protection of the present invention.

[0119] It should be noted that it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be encompassed within the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

Claims

1. A pile foundation drilling equipment, characterized in that: include: A safety barrel (1) is used to provide a safe construction space for construction workers. The safety barrel (1) is open at the bottom and has a top plate (2) at the top. The top plate (2) is provided with an opening (4) for construction workers and a material barrel (3) to pass through. An inflatable and deflable annular airbag (5) is provided around the outer periphery of the lower half of the safety barrel (1). A combined support frame, used for supporting the hole wall, comprising multiple layers of circular splicing pieces (6) connected in sequence from top to bottom, wherein the circular splicing pieces (6) at the bottom layer are connected to the top plate (2); The lifting system comprises a lifting bracket (8), a first lifting mechanism (9) for lifting the material bucket (3) and construction workers, and a second lifting mechanism for lifting the safety bucket (1) and the combined support frame.

2. The pile foundation drilling equipment according to claim 1, characterized in that: The safety barrel (1) is composed of a lower safety barrel and an upper safety barrel that are detachably connected, and the outer periphery of the lower safety barrel is wrapped with the annular airbag (5).

3. The pile foundation drilling equipment according to claim 1, characterized in that: The circular splicing piece (6) is formed by splicing a plurality of arc-shaped unit pieces (13) distributed in the circumferential direction, and each of the arc-shaped unit pieces (13) comprises at least two layers of arc-shaped alloy plates (17) and short alloy bars (18) connecting the arc-shaped alloy plates (17) of adjacent layers, and long alloy bars (19) connecting the arc-shaped unit pieces (13) of adjacent layers.

4. The pile foundation drilling equipment according to claim 3, characterized in that: The arc-shaped alloy plate (17) is provided with a mounting groove (20) and a positioning connection hole (21), wherein: The two mounting grooves (20) are arranged at both ends of the arc-shaped alloy plate (17) in the circumferential direction, and are used for allowing the long alloy strips (19) of the circular splicing pieces (6) of this layer to pass through and be fixed; A positioning connection hole (21) is provided on the center line between the two mounting grooves (20) for allowing the long alloy bars (19) of the circular splicing pieces (6) of adjacent layers to pass through. The positioning connection hole (21) is configured to allow two long alloy bars (19) to pass through with a margin for movement.

5. The pile foundation drilling equipment according to claim 4, characterized in that: A limiting block (22) is provided at the lower end of the long alloy bar (19) to prevent the long alloy bar (19) from separating from the arc-shaped alloy plate (17).

6. The pile foundation drilling equipment according to claim 1, characterized in that: The utility model also includes a monitoring system, comprising a lighting device (10) and a video monitoring module, wherein the lighting device (10) is arranged inside the safety barrel (1) and on the combined support frame, and the video monitoring module includes a camera device (11) and a display device (12), wherein the camera device (11) is arranged inside the safety barrel (1) and on the combined support frame, and the display device (12) is arranged outside the pile hole and is connected to the camera device (11) by signal.

7. A pile foundation drilling method, using the pile foundation drilling equipment according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: After the site is leveled, an initial hole section is excavated, and the safety barrel (1) provided with the annular airbag (5) is lowered; Step 2, inflating the annular airbag (5) to a predetermined pressure, stabilizing the hole wall, and then continuing the layered excavation; Step 3, by alternately inflating and deflating the air, the safety barrel (1) is gradually moved downward, and at the same time, the combined support frame is installed layer by layer at the orifice; Step 4: After reaching the designed depth, the pressure is released, the safety bucket (1) is lifted out, and the combined support frame is removed to complete the hole formation.

8. The pile foundation drilling method according to claim 7, characterized in that: In the step 2, when excavating in layers, the excavation depth of each layer is less than the height of the annular airbag (5).

9. The pile foundation drilling method according to claim 7, characterized in that: During the construction process, the status inside the hole is observed in real time through the video monitoring module.

10. The pile foundation drilling method according to claim 7, characterized in that: In step 3, when the soil quality is poor, the hole wall is reinforced before continuing excavation.

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