Protective device for rotary digging hole-forming cast-in-place pile hole

Abstract

The utility model relates to the field of cast-in-place pile hole protection, in particular to a rotary drilling cast-in-place pile hole protection device which comprises an internal supporting assembly and an external protection assembly. The inner wall of the pile hole can be supported by arranging the inner supporting assembly, the inner wall of the pile hole is prevented from collapsing or generating falling objects, the pile hole can be protected from the outside by arranging the outer protection assembly, the objects are prevented from being transferred into the pile hole from the upper portion, and the situation that people accidentally fall into the pile hole when passing by at night can also be prevented; therefore, the construction safety can be ensured, the environmental influence is reduced, and various potential safety accidents are prevented.

Description

Technical Field

[0001] This utility model relates to the field of protection for cast-in-place pile holes, and in particular to a protection device for cast-in-place pile holes formed by rotary drilling. Background Technology

[0002] Rotary drilling rigs are used to drill holes at predetermined locations using a rotary drilling machine to create pile holes that meet design requirements. These holes are primarily used to form cast-in-place piles, increasing the bearing capacity, stability, and lateral force resistance of the foundation. Due to their advantages such as fast construction speed, high hole quality, low environmental pollution, flexible and convenient operation, and strong applicability, rotary drilling rigs are widely used in foundation engineering projects for railways, highway bridges, municipal construction, and high-rise buildings.

[0003] Existing rotary-drilled cast-in-place pile holes are usually not protected after drilling. They are prone to collapse, falling objects, and other safety accidents when left for a long time or when construction workers are working inside. They are also prone to falling into the pile hole at night when people pass by, resulting in low safety.

[0004] Therefore, in view of the existing problems of large safety hazards and low safety of rotary-drilled cast-in-place pile holes, a protective device for rotary-drilled cast-in-place pile holes with internal structure and external protection structure can be designed. Whether the pile hole is idle or when workers are working inside, it can provide double protection for the pile hole from the inside and outside, making it safer and more reliable. Utility Model Content

[0005] In order to overcome the problem that existing rotary-drilled cast-in-place pile holes usually have significant safety hazards and low safety.

[0006] The technical solution of this utility model is: a protective device for rotary drilling cast-in-place pile holes, including an internal support component and an external protective component. The internal support component is arranged sequentially from top to bottom along the inner wall of the pile hole to support the inner wall of the pile hole. The number of internal support components is flexibly set according to the depth of the pile hole. The upper end of the internal support component is provided with an external protective component to prevent personnel from accidentally falling and to prevent objects from falling into the pile hole. The external protective component can be detachably installed on the ground outside the pile hole.

[0007] Preferably, the internal support components include ring plates, support columns, fall protection nets, bolts, and elastic blocks. The ring plates are evenly distributed in four groups from top to bottom. Adjacent ring plates are fixedly connected by the four groups of support columns that are evenly distributed around them. The size of the ring plates can be flexibly set according to the actual size of the pile hole.

[0008] Preferably, the outer sides of the four sets of ring plates are fitted with anti-fall nets to prevent sand from falling from the inner wall of the pile hole, and five sets of first mounting holes for installing and fixing the anti-fall nets are evenly distributed around the outer sides of the ring plates.

[0009] Preferably, the fall protection net is detachably connected to the ring plates by bolts, and multiple sets of elastic blocks for buffering and shock absorption are evenly and fixedly installed around the two outermost sets of ring plates at their ends that are far apart from each other.

[0010] Preferably, the external protective components include a fence, a mounting plate, a protective cover, a warning sticker, and a handle. The lower end of the fence is fixedly connected to a mounting plate for increasing the stability of the fence. The surface of the mounting plate is evenly provided with four sets of second mounting holes for mounting and fixing the mounting plate.

[0011] Preferably, the upper end of the fence is fitted with a protective cover for opening and closing via a hinge, and a warning sticker for alerting people is affixed to the upper center of the protective cover.

[0012] Preferably, a handle for opening and closing the protective cover is fixedly installed on the upper side of the protective cover, and multiple sets of through slots are evenly distributed around the side of the enclosure.

[0013] The beneficial effects of this utility model are:

[0014] 1. By setting up internal support components, the inner wall of the pile hole can be supported to prevent the inner wall of the pile hole from collapsing or falling objects. By setting up external protection components, the pile hole can be protected from the outside to prevent objects from falling into the pile hole from above, and to prevent people from accidentally falling into the pile hole when passing by at night. This can ensure construction safety, reduce environmental impact, and prevent various potential safety accidents. Attached Figure Description

[0015] Figure 1 The diagram shown is a three-dimensional structural schematic of the protective device for rotary drilling and grouting piles of this utility model.

[0016] Figure 2 The diagram shown is a three-dimensional structural schematic of the internal support components of the protective device for rotary drilling and grouting piles of this utility model.

[0017] Figure 3 The diagram shown is a three-dimensional structural diagram of the ring plate of the protective device for rotary drilling cast-in-place piles according to this utility model.

[0018] Figure 4 The diagram shown is a three-dimensional structural schematic of the external protective components of the rotary drilling and grouting pile hole protection device of this utility model.

[0019] Explanation of reference numerals in the attached drawings: 101, ring plate; 102, support column; 103, fall protection net; 104, first mounting hole; 105, bolt; 106, elastic block; 201, enclosure; 202, through groove; 203, mounting plate; 204, second mounting hole; 205, protective cover; 206, warning sticker; 207, handle. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Rotary drilling cast-in-place pile holes refer to pile holes formed by drilling operations using rotary drilling rigs during foundation construction of building engineering. The rotary drilling rig drives the drill rod and drill bit to rotate through the power head, while applying downward pressure to make the drill bit cut into the strata. After breaking up the rock and soil, the drill cuttings are transported to the ground through the internal channels of the drill rod or the spiral blades, thus gradually forming a cylindrical hole with a certain depth and diameter. This hole is the rotary drilling cast-in-place pile hole.

[0022] Construction process

[0023] Positioning and setting out: At the construction site, according to the requirements of the design drawings, use surveying instruments (such as total station, theodolite, etc.) to accurately position and set out the pile positions, determine the center position of each pile hole, and mark it. This is a key step to ensure the accuracy of the pile hole position and provide a benchmark for subsequent construction.

[0024] Drilling rig positioning: Move the rotary drilling rig to the pre-positioned pile location. By adjusting the position of the chassis and the verticality of the mast, ensure that the center of the drill bit coincides with the center of the pile location and that the mast is vertical. During this process, the operator needs to use tools such as a level to check the flatness and verticality of the drilling rig to ensure that the drilling rig is in good working condition during operation.

[0025] Drilling: Start the power head of the rotary drilling rig to make the drill rod and drill bit start rotating. At the same time, use the pressurization device to apply downward pressure to the drill rod. The drill bit begins to cut into the strata. During drilling, adjust the speed, torque and pressure of the power head and drill rod according to the properties of the strata (such as soft soil, hard soil, rock, etc.). For example, in soft soil layers, the speed can be increased and the pressure reduced; in hard soil or rock layers, the speed needs to be reduced and the torque and pressure increased. As the drill bit continues to penetrate deeper, the broken rock and soil are lifted to the ground through the hollow channel inside the drill rod (for drill rods with internal channels) or along the helical blades of the drill rod (for auger drill bits), gradually forming the pile hole.

[0026] Hole cleaning: Once the pile hole reaches the designed depth, a hole cleaning operation is required. The purpose of hole cleaning is to remove sediment from the bottom of the pile hole and mud cake from the hole wall to ensure good friction between the pile body and the foundation soil, thereby improving the pile's bearing capacity. There are several methods for hole cleaning, such as using the mud replacement method, replacing the mud in the hole with fresh, lower-density mud, and using the circulation of the mud to carry the sediment out of the hole; or using a slag removal cylinder to directly remove the sediment from the bottom of the hole.

[0027] Reinforcing cage fabrication and placement: While cleaning the hole, the reinforcing cage can be fabricated. The reinforcing cage is a frame structure welded from reinforcing bars according to design requirements. Its function is to enhance the strength of the pile body. After the reinforcing cage is fabricated, it is slowly placed into the pile hole by a crane, and it is necessary to ensure that the position of the reinforcing cage is accurate and vertically centered.

[0028] Concrete pouring: After the steel cage is placed, concrete pouring can begin. Concrete is usually poured using the tremie pipe method, where concrete is slowly poured into the pile hole through the tremie pipe, gradually filling the pile hole. During the pouring process, it is important to control the pouring speed and the immersion depth of the tremie pipe to prevent quality problems such as pile breakage and necking. As concrete is continuously poured in, the pile hole is gradually filled, eventually forming a rotary-dug cast-in-place pile.

[0029] Piling hole quality requirements

[0030] Pile hole diameter: It must meet the design requirements, and its deviation is generally controlled within a certain range. For example, the allowable deviation is usually around ±50mm. If the pile hole diameter is too large, it may lead to an increase in the amount of concrete used, resulting in waste; if the diameter is too small, it may affect the bearing capacity of the pile body.

[0031] Pile hole verticality: This is one of the important indicators for measuring the quality of pile holes. The verticality deviation of pile holes is generally required to be no more than 1%. If the verticality of the pile hole is insufficient, it will cause the pile to tilt, resulting in uneven distribution of the pile's bearing capacity, which may affect the stability of the building in severe cases.

[0032] Pile hole depth: The design depth must be reached, and the thickness of the sediment at the bottom of the hole must meet the specified standards. For example, for friction piles, the sediment thickness at the bottom of the hole is generally required to be no more than 300mm; for end-bearing piles, the sediment thickness requirement is even stricter, generally no more than 50mm. Excessive sediment at the bottom of the hole will reduce the bearing capacity of the pile tip and affect the overall performance of the pile.

[0033] Rotary drilling of bored piles is mainly used to form bored piles to increase the bearing capacity of the foundation, improve the stability of the foundation, and enhance its lateral force resistance. Its main functions are as follows:

[0034] 1. Increase the bearing capacity of the foundation: By rotary drilling and pouring concrete, the bearing capacity of the foundation can be effectively increased. The poured concrete piles can penetrate deep into the soil or rock layers, transferring the load of the superstructure to deeper and more stable soil or rock layers, thereby improving the bearing capacity of the entire foundation.

[0035] 2. Improve foundation stability: The construction process of rotary drilling piles can improve the foundation conditions. By pouring concrete to form a stable pile foundation, the stability of the foundation is effectively improved. This improvement in stability helps to prevent the foundation from settling or tilting under load, ensuring the safety of the building.

[0036] 3. Enhanced lateral force resistance: Rotary-drilled piles can also enhance the lateral force resistance of the foundation. Under horizontal loads such as earthquakes and wind loads, the piles can act as "anchors" to fix the building and prevent it from horizontal displacement or toppling, thereby improving the seismic and wind resistance of the building.

[0037] Rotary drilling of cast-in-place piles plays a crucial role in the construction of building foundations. It ensures the stability and safety of buildings, improves construction efficiency and quality, enhances the seismic and wind resistance of buildings, and adapts to various geological conditions.

[0038] Please see Figure 1 This utility model provides an embodiment of a protective device for rotary-drilled cast-in-place pile holes, which includes an internal support component and an external protective component. The internal support component is arranged sequentially from top to bottom along the inner wall of the pile hole to support the inner wall of the pile hole. The number of internal support components is flexibly set according to the depth of the pile hole. The upper end of the internal support component is provided with an external protective component to prevent personnel from accidentally falling and to prevent objects from falling into the pile hole. The external protective component can be detachably installed on the ground outside the pile hole.

[0039] Please see Figures 2-3 In this embodiment, the internal support assembly includes a ring plate 101, support columns 102, a fall arrest net 103, bolts 105, and elastic blocks 106. The ring plates 101 are evenly distributed in four groups from top to bottom. Adjacent ring plates 101 are fixedly connected by the four groups of support columns 102 that are evenly distributed around them. The size of the ring plates 101 is flexibly set according to the actual size of the pile hole. The fall arrest net 103 for preventing sand from falling from the inner wall of the pile hole is attached to the outer side of the four groups of ring plates 101. Five sets of first mounting holes 104 for installing and fixing the fall arrest net 103 are evenly distributed around the outer side of the ring plates 101. The fall arrest net 103 is detachably connected to the ring plates 101 by bolts 105. Multiple sets of elastic blocks 106 for buffering and shock absorption are evenly distributed and fixedly installed around the two outermost groups of ring plates 101 at their far ends.

[0040] Please see Figure 4 In this embodiment, the external protective components include a fence 201, a mounting plate 203, a protective cover 205, a warning sticker 206, and a handle 207. The lower end of the fence 201 is fixedly connected to the mounting plate 203 for increasing the stability of the fence 201. The surface of the mounting plate 203 is evenly distributed with four sets of second mounting holes 204 for mounting and fixing the mounting plate 203. The upper end of the fence 201 is hinged to a protective cover 205 for opening and closing. A warning sticker 206 for warning and reminder is pasted on the upper middle part of the protective cover 205. A handle 207 for opening and closing the protective cover 205 is fixedly installed on the upper side of the protective cover 205. Multiple sets of through slots 202 are evenly distributed around the side of the fence 201.

[0041] When carrying out the work, firstly, according to the depth and width of the pile hole, set up internal support components and external protection components with matching dimensions and a corresponding number of internal support components, and then set up a fall protection net 103 on the outside of the ring plate 101 of the internal support component, and use bolts 105 to install and fix the fall protection net 103.

[0042] Then, the internal support components are stacked and placed into the pile hole in sequence, so that the internal support components support the inner wall of the pile hole. During the placement of the internal support components, the elastic blocks 106 between the ring plates 101 of adjacent internal support components buffer and dampen the shock to prevent the ring plates 101 from being damaged during stacking.

[0043] During the operation of the internal support components, the inner wall of the pile hole is supported by the ring plate 101 in conjunction with the support column 102, and the anti-fall net 103 on the outside of the ring plate 101 prevents sand and gravel from falling from the inner wall of the pile hole.

[0044] Then, install and fix the external protective components on the ground outside the upper end of the pile hole. Install and fix the mounting plate 203 at the lower end of the external protective component enclosure 201 on the ground through the second mounting hole 204. Close the protective cover 205 at the upper end of the enclosure 201. Finally, affix the relevant warning sticker 206 to the upper end of the protective cover 205 for warning and reminder.

[0045] Through the above steps, by setting up internal support components, the inner wall of the pile hole can be supported to prevent collapse or falling objects from the inner wall. By setting up external protective components, the pile hole can be protected from the outside to prevent objects from being dropped into the pile hole from above, and to prevent people from accidentally falling into the pile hole when passing by at night. This can ensure construction safety, reduce environmental impact, and prevent various potential safety accidents. This solves the problem that existing rotary-drilled cast-in-place pile holes usually do not have protective measures inside after drilling, and are prone to collapse, falling objects, and other safety accidents when left for a long time or when construction workers are working inside, or people can easily fall into the pile hole when passing by at night, resulting in low safety.

Claims

1. A protective device for rotary-drilled cast-in-place pile holes, comprising an internal support assembly; characterized in that: It also includes external protective components and internal support components arranged sequentially from top to bottom along the inner wall of the pile hole to support the inner wall of the pile hole. The number of internal support components is flexibly set according to the depth of the pile hole. The upper end of the internal support components is provided with external protective components to prevent personnel from accidentally falling and to prevent objects from falling into the pile hole. The external protective components can be detached and installed on the ground outside the pile hole.

2. The protective device for rotary-drilled cast-in-place pile holes according to claim 1, characterized in that: The internal support components include ring plates (101), support columns (102), fall protection nets (103), bolts (105), and elastic blocks (106). The ring plates (101) are evenly distributed in four groups from top to bottom. Adjacent ring plates (101) are fixedly connected by the four groups of support columns (102) that are evenly distributed around them. The size of the ring plates (101) can be flexibly set according to the actual size of the pile hole.

3. The protective device for rotary-drilled cast-in-place pile holes according to claim 2, characterized in that: The outer sides of the four sets of ring plates (101) are fitted with anti-fall nets (103) to prevent sand from falling from the inner wall of the pile hole. Five sets of first mounting holes (104) for installing and fixing the anti-fall nets (103) are evenly distributed around the outer sides of the ring plates (101).

4. The protective device for rotary-drilled cast-in-place pile holes according to claim 2, characterized in that: The fall protection net (103) is detachably connected to the ring plate (101) by bolts (105). The two outermost ring plates (101) are surrounded by multiple sets of elastic blocks (106) for buffering and shock absorption, which are evenly distributed and fixed at their ends.

5. The protective device for rotary-drilled cast-in-place pile holes according to claim 1, characterized in that: The external protective components include a fence (201), a mounting plate (203), a protective cover (205), a warning sticker (206), and a handle (207). The lower end of the fence (201) is fixedly connected to a mounting plate (203) for increasing the stability of the fence (201). The surface of the mounting plate (203) is evenly provided with four sets of second mounting holes (204) for mounting and fixing the mounting plate (203).

6. The protective device for rotary-drilled cast-in-place pile holes according to claim 5, characterized in that: The upper end of the enclosure (201) is fitted with a protective cover (205) for opening and closing via a hinge, and a warning sticker (206) for warning and reminder is affixed to the middle of the upper end of the protective cover (205).

7. The protective device for rotary-drilled cast-in-place pile holes according to claim 5, characterized in that: A handle (207) for opening and closing the protective cover (205) is fixedly installed on the upper side of the protective cover (205), and multiple sets of through slots (202) are evenly distributed around the side of the enclosure (201).

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