A semi-preform of a cast-in-place pile and a pile-forming apparatus

Abstract

This invention discloses a semi-precast component and pile-forming equipment for cast-in-place piles in the field of precast pile technology, aiming to solve the problem of groundwater erosion carrying away the concrete of cast-in-place piles in existing technologies. It includes: an airbag inflated to the designed dimensions and shape of the cast-in-place pile through a gas exchange port; concrete is poured into the inflated airbag through a filling inlet and vented through the gas exchange port; the airbag prevents the concrete from being washed away by groundwater in the pile hole, greatly improving the quality of the cast-in-place pile; a skeleton provides support for the deflated airbag, maintaining its low-resistance shape; the airbag's low-resistance shape facilitates placement into the pile hole; after inflation, the skeleton expands radially within the cast-in-place pile, providing tensile strength, reinforcement, and crack resistance; and mud can be poured into the filling inlet to protect the pile hole and prevent collapse.

Description

Technical Field

[0001] This invention relates to a semi-precast component of a cast-in-place pile, a pile-forming device, a cast-in-place pile, and a method for manufacturing cast-in-place piles, belonging to the field of precast pile technology. Background Technology

[0002] Cast-in-place piles are a type of foundation support structure commonly used in building and foundation engineering. They are typically used to enhance the bearing capacity of soil or rock to support structures such as buildings, bridges, docks, and retaining walls. Cast-in-place piles are long, columnar elements placed vertically underground, capable of transferring structural loads to deeper strata, thereby distributing the load and reducing settlement. In the traditional casting-in-place pile construction process, groundwater can have a significant impact on the quality of the piles. Groundwater issues during pile construction have always been a key and extremely difficult problem to solve. The location of groundwater is difficult to predict, significantly affecting pile foundation construction. Groundwater can wash away concrete grout, greatly affecting pile quality and potentially leading to pile instability. Furthermore, groundwater causes significant time commitment for drainage during construction, often resulting in repeated groundwater inflows and prolonged construction periods. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a semi-prefabricated component, pile forming equipment, cast-in-place pile, and method for manufacturing cast-in-place piles that solve the problem of groundwater impact during cast-in-place pile construction.

[0004] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0005] In a first aspect, the present invention provides a semi-precast component of a cast-in-place pile, comprising an air bladder and a frame disposed inside the air bladder. The shape of the air bladder when inflated reaches the design dimensions of the cast-in-place pile. The frame is used to support the air bladder in a low-resistance shape along the axial direction of the air bladder when the air bladder is deflated. The resistance of the air bladder in the low-resistance shape when inserted into the pile hole is lower than that of the air bladder when inflated. When the air bladder is inflated, the frame expands radially along the air bladder. The inflation material of the air bladder includes gas, mud and / or concrete.

[0006] The airbag has a gas exchange port and a filler injection port for injecting mud or concrete.

[0007] In some embodiments of the first aspect, the skeleton includes an axial skeleton extending along the axial direction of the airbag and a plurality of radial skeletons connected to the axial skeleton, the connection points of the radial skeletons and the axial skeletons being distributed along the axial direction of the airbag.

[0008] Ⅰ. The radial skeleton includes a radial telescopic skeleton, which is arranged intersecting the axial skeleton. The end of the radial telescopic skeleton away from the connection point is movably connected to the rib, and the rib is connected to the airbag along the inner wall of the airbag.

[0009] or,

[0010] II. The connection point is a hinge point. When the airbag is deflated, the radial frame overlaps with the axial frame. When the airbag is inflated, the radial frame rotates and expands radially along the airbag. The radial frame and / or the axial frame are provided with anti-rotation blocks near the connection point, and include at least one of the following three:

[0011] II.a. The radial skeleton includes a heavy side strip on one side of the axial skeleton and a light side strip on the other side. The heavy side strip is heavier than the light side strip. When the airbag is inflated, the heavy side strip rotates downward.

[0012] II.b. The connection point is provided with a spring coil, and the fixing point of the spring coil is connected to the radial skeleton and the axial skeleton respectively. When the radial skeleton and the axial skeleton are superimposed, the spring coil is in a compressed / stretched state.

[0013] II.c. The end of the radial skeleton away from the connection point is movably connected to the rib, and the rib is connected to the airbag along the inner wall of the airbag.

[0014] In some embodiments of the first aspect, the skeleton includes an axial skeleton extending along the axial direction of the airbag and a plurality of radial skeletons connected to the axial skeleton.

[0015] The axial frame extends out of the airbag and forms a coupling, and the axial frame is rotatably connected to the airbag through the hole through which it extends.

[0016] In some embodiments of the first aspect, when the airbag is inflated, the airbag and the skeleton exhibit radial expansion at the pile shoe end of the semi-precast component of the cast-in-place pile.

[0017] Secondly, the present invention provides a pile-forming device, including a walking device, and further including telescopic drill bits that are all facing the ground but at different planar positions, an air inlet and a filler injection outlet, wherein the filler injection outlet is used for injecting mud or concrete; and further including an air compressor connected to the air inlet.

[0018] In some embodiments of the second aspect, the telescopic drill bit is a rotary drilling bit, and the end of the rotary drilling bit is provided with a coupling structure that matches the coupling.

[0019] In some embodiments of the second aspect, a slag pipe is provided inside the telescopic drill bit, and the slag pipe and the end of the telescopic drill bit are connected to the outside.

[0020] In some embodiments of the second aspect, the inner contour of the slag pipe at the end of the rotary drilling bit matches the coupling, and the coupling is drivenly connected to the rotary drilling bit when inserted into the slag pipe.

[0021] Thirdly, the present invention provides a cast-in-place pile, comprising a semi-precast component of the cast-in-place pile as described in any one of the first aspects, wherein the air bladder is inflated and the inflating material is concrete.

[0022] Fourthly, the present invention also provides a method for manufacturing cast-in-place piles, characterized in that,

[0023] An airbag was placed inside the pile hole;

[0024] The inflatable airbag reaches the design dimensions of the cast-in-place pile, and a frame is installed inside the airbag;

[0025] Concrete is poured into the airbag to replace the inflator until the concrete reaches the design dimensions of the cast-in-place pile.

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0027] The semi-precast component of the cast-in-place pile provided by this invention has an air bladder that is inflated to the designed size and shape of the cast-in-place pile through a gas exchange port. When the air bladder is inflated, concrete is poured into it through the filling port and the air is vented through the gas exchange port. The air bladder can prevent the concrete from being washed away by groundwater in the pile hole, which greatly improves the quality of the cast-in-place pile. The skeleton provides support for the deflated air bladder and maintains the low resistance of the air bladder. The air bladder is kept in a low resistance state, which makes it easy to place into the pile hole. After the air bladder is inflated, the skeleton expands radially and plays a role in tensile strength, reinforcement and crack resistance of the concrete in the cast-in-place pile. Mud can also be poured into it through the filling port to protect the pile hole and prevent the pile hole from collapsing.

[0028] The axial skeleton supports the airbag axially. The distribution of the axial skeleton and radial skeleton increases the contact area between the skeleton and the concrete. When the airbag is inflated, the ribs pull the radial telescopic skeleton to unfold, reducing the shape resistance of the semi-precast pile when it is dry and improving the radial unfolding efficiency of the skeleton. The ribs increase the contact area between the skeleton and the concrete. Alternatively: the weight difference between the heavy side strip and the light side strip, the release of elastic potential energy of the spring coil from the overlap to the rotation of the radial skeleton and / or the ribs pulling the radial skeleton to rotate when the airbag is inflated, improve the radial unfolding efficiency of the skeleton. The anti-rotation block prevents the further unfolding of the radial skeleton after the skeleton has unfolded radially, so that the skeleton maintains the optimal unfolded radial width.

[0029] The coupling is used to drive the frame to rotate, mix, and vibrate the concrete inside the air chamber;

[0030] The pile shoe tip exhibits radial expansion, which improves the bearing capacity of the cast-in-place pile;

[0031] The piling equipment provided by this invention includes a telescopic drill bit for drilling pile holes, an air inlet pressurized by an air compressor to output air into the air bladder inside the pile hole, and a filler injection outlet for injecting mud and / or concrete into the air bladder inside the pile hole. The walking device only needs to move the planar position of the piling equipment to control the telescopic drill bit, air inlet or filler injection outlet to align with the pile hole, thereby improving piling efficiency.

[0032] Rotary drilling bits can be connected to the drive mechanism of a coupling to enable the frame to mix and vibrate concrete.

[0033] An opening for a slag pipe at the end of the telescopic drill bit facilitates the removal of slag.

[0034] The cast-in-place piles provided by this invention avoid the concrete being washed away by groundwater, resulting in excellent pile quality and mechanical properties.

[0035] The method for manufacturing cast-in-place piles provided by this invention avoids groundwater washing away the concrete, and the resulting cast-in-place piles have excellent mechanical properties. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the pile-forming equipment provided in the embodiment of the present invention.

[0037] Figure 2 This is a schematic diagram illustrating the structural principle of a semi-precast cast-in-place pile in a deflated airbag state, as provided in an embodiment of the present invention.

[0038] Figure 3 This is a schematic diagram illustrating the structural principle of a semi-precast cast-in-place pile in an inflated airbag state, as provided in an embodiment of the present invention.

[0039] Figure 4 yes Figure 3 A schematic diagram illustrating the radial expansion structure of the pile shoe end;

[0040] Figure 5 yes Figure 1 Schematic diagram of the structural principle of rotary drilling bit or telescopic drilling bit (1-1);

[0041] Figure 6 yes Figure 2 , Figure 3 or Figure 4 A schematic diagram illustrating the structural principle of the intermediate connection point;

[0042] Figure 7 This is a schematic diagram of the steps in the pile-making method provided in an embodiment of the present invention;

[0043] Figure 8 This is a step diagram of the pile fabrication method provided in the embodiment of the present invention;

[0044] Figure 9 yes Figure 2 , Figure 3 A schematic diagram of the bending and folding structure of a semi-precast component of a cast-in-place pile when the air bladder is deflated;

[0045] Figure 10 yes Figure 1 Schematic diagram of the telescopic drill bit and hydraulic pump;

[0046] Figure 11 yes Figure 10 The front view;

[0047] In the diagram: 1: Pile driving equipment; 1-1: Cab; 1-2: Satellite positioning antenna; 1-3: Satellite positioning signal processor; 1-4: Vehicle body; 1-5: Walking device; 1-5.1: Wheel hub; 1-6: Telescopic drill bit; 1-7: Filler injection outlet; 1-8: Filler receiving inlet; 1-9: Air compressor; 1-10: Valve controller; 1-11: Pneumatic control valve; 1-12: Slag pipeline; 1-13: Reaction frame; 1-14: Drive turntable; 1-15: Hydraulic pump; 1-16: Air inlet; 1-6.1: Rotary drilling bit; 1-6.1.1: Coupling structure;

[0048] 2: Semi-precast component of cast-in-place pile; 2-1: Filler injection port; 2-2: Skeleton; 2-2.1: Axial skeleton; 2-2.2: Radial skeleton; 2-2.2.1: Heavy edge strip; 2-2.2.2: Light edge strip; 2-2.3: Rib; 2-2.2.3: Radial expansion skeleton; 2-3: Connection point; 2-3.1: Spring ring; 2-3.1.1: Fixing point; 2-4: Airbag; 2-5: Coupling; 2-6: Bolt; 2-7: Gas exchange port; 2-8: Anti-rotation block; 2-9: Pile shoe end;

[0049] 3: Pile holes;

[0050] 4: Cast-in-place piles. Detailed Implementation

[0051] The technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments and specific features in the embodiments are detailed descriptions of the technical solution of this application, rather than limitations thereof. In the absence of conflict, the embodiments and technical features in the embodiments can be combined with each other. Example 1

[0052] This embodiment provides a semi-precast component 2 for cast-in-place piles to solve the problem in the prior art where groundwater washes away the concrete during concrete pouring, resulting in poor pile quality.

[0053] refer to Figure 2 , Figure 3 and Figure 4The semi-precast component 2 of the cast-in-place pile provided in this embodiment includes an air bladder 2-4 and a frame 2-2 disposed inside the air bladder 2-4. The shape of the air bladder 2-4 when inflated reaches the design dimensions of the cast-in-place pile 4. In this embodiment, the design dimensions include the most typical standard cylindrical shape, a design shape that expands into a trumpet shape at the pile shoe end 2-9 at the bottom of the axial direction, a hexagonal cross-section, and of course, other shapes are also possible. The frame 2-2 is used to support the air bladder 2-4 in a low-resistance shape along the axial direction of the air bladder 2-4 when the air bladder 2-4 deflates. (Refer to...) Figure 2 The airbag 2-4 can be cigar-shaped or rugby ball-shaped, or it can be slender or folded. The resistance of the low-resistance airbag 2-4 when inserted axially into the pile hole 3 is lower than that of the airbag 2-4 when inflated. When the airbag 2-4 is inflated, the skeleton 2-2 expands radially along the airbag 2-4. The inflation material of the airbag 2-4 includes gas (such as air), mud and / or concrete. When the airbag 2-4 is inflated with gas, if the bottom of the pile hole 3 is found to collapse, it will be partially replaced with mud for inflation. When concrete is poured after inflation, the inflation material in the airbag 2-4 includes gas, mud and concrete. The airbag 2-4 has a gas exchange port 2-7 and a filler injection port 2-1 for pouring mud or concrete. The skeleton 2-2 can adopt a composite lever structure or an umbrella skeleton shape. The skeleton 2-2 can be fixedly connected to the airbag 2-4 axially, hinged, or / and physically separated but in contact with each other under force.

[0054] When using it, you can Figure 2 The shriveled, cigar-shaped airbags 2-4 shown are hoisted to... Figure 7 In the pile hole 3 shown, the axial position of the airbag 2-4 (or the semi-precast component 2 of the cast-in-place pile) is aligned with the axial position of the pile hole 3 to ensure the correct positioning of the airbag 2-4; air is then introduced into the airbag 2-4 through the gas exchange port 2-7 to inflate the airbag 2-4 to its maximum capacity. Figure 3 or Figure 4 The design dimensions of the cast-in-place pile 4 are determined by injecting concrete through the filling inlet 2-1 until the injected gas or concrete is displaced and the design dimensions of the cast-in-place pile 4 are achieved. During this process, the gas is discharged through the gas exchange port 2-7. The gas exchange port 2-7 and the filling inlet 2-1 are then closed, and the concrete is cured until it reaches the design strength. During this process, groundwater cannot wash away the concrete due to the obstruction of the air bladder 2-4, and the quality of the concrete inside the air bladder 2-4 will not decrease. This solves the problem of groundwater washing away the concrete during the casting of cast-in-place piles, which leads to a significant decrease in the quality of the cast-in-place pile 4 in the existing technology. If the hole collapses, mud can be partially or completely injected through the filling inlet 2-1 to protect the wall while the air bladder 2-4 is being inflated. The concrete injection pipe can be inserted from the filling inlet 2-1 into the bottom of the bladder 2-4 and the mud can be replaced by the mud replacement method (the mud can be discharged from the gas exchange port 2-7) to avoid the problem of mud being difficult to remove.

[0055] Inflate the airbag 2-4 by introducing air into the air exchange port 2-7 until the airbag 2-4 is fully inflated. Figure 3 or Figure 4 In the process of designing the dimensions of the cast-in-place pile 4, reference was made to Figure 3 The skeleton 2-2 is radially expanded through a combination of methods, including the connection point between the airbag 2-4 and the skeleton 2-2, the release of the elastic potential energy of the springs at the joints inside the skeleton 2-2, the use of shape memory metal, and the downward fall of the self-weight of the internal rods of the skeleton 2-2. After radial expansion, the skeleton 2-2 performs the functions of constraining the pile concrete, improving the pile's seismic resistance, increasing the pile's bearing capacity, and resisting tension and cracking. The skeleton 2-2 is generally a steel skeleton.

[0056] The semi-precast component 2 of the cast-in-place pile provided in this embodiment is mainly used for the production of plain piles and semi-plain piles where the requirements for the reinforcing cage are not high. The airbag 2-4 can be made of nylon cloth, canvas, or plastic, preferably a rubber bag. In some embodiments, the airbag 2-4 is not completely impermeable; the airbag 2-4 only needs to ensure that it basically prevents the outward seepage of cement particles.

[0057] This embodiment also provides a pile-forming device 1, which is one of the devices used to manufacture the semi-precast component 2 of the cast-in-place pile provided in this embodiment into a cast-in-place pile 4. (Refer to...) Figure 1 The system includes a walking device 1-5, which is used to propel the pile-forming equipment 1 to different construction sites. The walking device 1-5 can have four hubs 1-5.1. The walking device 1-5 is used to change the planar position of the pile-forming equipment 1 so that different components are aligned with the pile hole 3. It also includes a telescopic drill bit 1-6, an air inlet 1-16, and a filler injection outlet 1-7, all facing the ground but with different planar positions. The walking device 1-5 can control the planar position of the pile-forming equipment 1 on the ground so that the telescopic drill bit 1-6, the air inlet 1-16, or the filler injection outlet 1-7 can be positioned accordingly. The filler outlet 1-7 is aligned with the pile hole 3. The filler outlet 1-7 is used for injecting mud or concrete. The filler outlet 1-7 can be directly or indirectly connected to the filler inlet 2-1 via a pipeline. It also includes an air compressor 1-9 connected to the air inlet 1-16. The air inlet 1-16 can be directly (the air bladder 2-4 is mostly made of soft material and can be directly pulled upwards to connect the gas exchange port 2-7 to the air inlet 1-16) or indirectly connected to the gas exchange port 2-7 via a pipeline. The air compressor 1-9 collects air and drives the air inlet 2-4 to inflate it. Therefore, refer to... Figure 2 , Figure 3 and Figure 4The gas exchange port 2-7 and the filler injection port 2-1 can be located at the end of the airbag 2-4 axially close to the ground, facilitating direct alignment and connection of the gas exchange port 2-7 and the filler injection port 2-1 with the gas supply port 1-16 and the filler injection outlet 1-7. The telescopic drill bit 1-6 is used to drill the pile hole 3. When the cast-in-place pile 4 is a displacement pile, the diameter of the pile hole 3 drilled by the telescopic drill bit 1-6 can be smaller than the diameter of the cast-in-place pile 4. The airbag 2-4 includes airbags for ordinary cast-in-place piles and airbags for irregularly shaped cast-in-place piles. Air compressor 1-9, air supply port 1-16, and gas exchange port 2-7 can be used to supply air into the concrete to create inflatable concrete. Example 2

[0058] This embodiment provides a semi-precast component 2 for cast-in-place piles, which is a further improvement on the semi-precast component 2 for cast-in-place piles provided in Embodiment 1. For details not covered, please refer to Embodiment 1.

[0059] This embodiment describes two schemes, I and II, in which the skeleton 2-2 expands radially along the airbag 2-4 when the airbag 2-4 is inflated. Other schemes will not be described here as they are based on similar principles to those in this embodiment.

[0060] First, refer to Figure 2 , Figure 3 and Figure 4 The skeleton 2-2 includes an axial skeleton 2-2.1 extending along the axis of the airbag 2-4 and multiple radial skeletons 2-2.2 connected to the axial skeleton 2-2.1. The connection points 2-3 between the radial skeletons 2-2.2 and the axial skeleton 2-2.1 are distributed along the axis of the airbag 2-4. Generally, the axial skeleton 2-2.1 is also distributed along the axis of the airbag 2-4. The radial skeletons 2-2.2 are not all located at the same cross section; they can be connected to the axial skeleton 2-2.1 from various radial angles to form a three-dimensional skeleton structure. Figure 2 , Figure 3 and Figure 4 This is only for the purpose of facilitating the understanding and demonstration of the two-dimensional skeleton structure.

[0061] Two main schemes, I and II, for radial deployment during the inflation of the accompanying airbags 2-4 of the radial skeleton 2-2.2:

[0062] I. Radial frame 2-2.2 includes radial telescopic frame 2-2.2.3, which is arranged intersecting with axial frame 2-2.1, as shown in the reference. Figure 2 The radial telescopic frame 2-2.2.3 can be arranged perpendicularly to the axial frame 2-2.1. The end of the radial telescopic frame 2-2.2.3 furthest from the connection point 2-3 is movably connected to the rib 2-2.3, which can be a flexible transition, hinge, or ball-and-groove connection. The rib 2-2.3 is connected to the airbag 2-4 along the inner wall of the airbag 2-4. When the airbag 2-4 inflates, the rib 2-2.3 pulls the radial telescopic frame 2-2.2.3 to expand radially. Figure 2 Hanghe Figure 3 As shown by the arrow, it expands radially to Figure 3 or Figure 4 The specific design of the radial telescopic frame 2-2.2.3 can be a folding rod structure (refer to the folding shrink cup), a structure in which at least two rods are slidably connected by a slide rail, or a continuous cross bracing structure (refer to the telescopic gate); when the airbag 2-4 is deflated, atmospheric pressure can keep the radial telescopic frame 2-2.2.3 in a contracted state without extending.

[0063] Option I satisfies the requirement that connection points 2-3 must be fixed points, while Option II is suitable when connection points 2-3 do not have the requirement to be fixed points.

[0064] II. First, connection point 2-3 is a hinge point. Connection point 2-3 can connect the axial frame 2-2.1 and the radial frame 2-2.2 via bolt 2-6. Bolt 2-6 can be used to adjust the rotational resistance of the radial frame 2-2.2 and the axial frame 2-2.1 or to stop rotation. When the airbag 2-4 is deflated, the radial frame 2-2.2 and the axial frame 2-2.1 overlap (i.e., the intersection angle between the radial frame 2-2.2 and the axial frame 2-2.1 is 0° or close to 0°). Atmospheric pressure can cause the radial frame 2-2.2 and the axial frame 2-2.1 to overlap. When the airbag 2-4 is inflated, the radial frame 2-2.2 rotates and expands radially along the airbag 2-4. The radial expansion scheme of the radial frame 2-2.2 includes at least one of the following three sub-II schemes II.a, II.b, and II.c, which can be used in combination:

[0065] II.a: Reference Figure 3 The radial skeleton 2-2.2 includes a heavy edge strip 2-2.2.1 on one side of the axial skeleton 2-2.1 and a light edge strip 2-2.2.2 on the other side. The heavy edge strip 2-2.2.1 is heavier than the light edge strip 2-2.2.2. This can be achieved by installing a counterweight on the heavy edge strip 2-2.2.1, or by making the heavy edge strip 2-2.2.1 longer, denser, or thicker than the light edge strip 2-2.2.2. (Refer to...) Figure 3 The arrow, based on the torque around the connection point 2-3 caused by the gravity difference between the heavy edge strip 2-2.2.1 and the light edge strip 2-2.2.2, when the airbag 2-4 is inflated, the heavy edge strip 2-2.2.1 and the light edge strip 2-2.2.2 have sufficient rotation space. The heavy edge strip 2-2.2.1 rotates downwards and exhibits radial expansion with the radial skeleton 2-2.2 rotating and the intersection angle with the axial skeleton 2-2.1 gradually increasing.

[0066] II.b: Reference Figure 3 and Figure 5A spring coil 2-3.1 is provided at connection point 2-3. The fixing point 2-3.1.1 of the spring coil 2-3.1 is connected to the radial skeleton 2-2.2 and the axial skeleton 2-2.1 respectively. In this embodiment, the two fixing points 2-3.1.1 are located at the center and edge of the spring coil 2-3.1 respectively, and are connected to the axial skeleton 2-2.1 and the radial skeleton 2-2.2 respectively. When the radial skeleton 2-2.2 and the axial skeleton 2-2.1 are stacked, the spring coil 2-3.1 is in a compressed / stretched state. When the airbag 2-4 is inflated, in order to release the elastic potential energy, the spring coil 2-3.1 drives the radial skeleton 2-2.2 to rotate and the radial expansion with the intersection angle with the axial skeleton 2-2.1 gradually increases.

[0067] II.c, Reference Figure 3 The radial skeleton 2-2.2 is movably connected to the rib 2-2.3 at one end away from the connection point 2-3. This connection can be flexible, articulated, or ball-and-groove. The rib 2-2.3 is connected to the airbag 2-4 along the inner wall of the airbag 2-4. When the airbag 2-4 is inflated, the movement of the airbag 2-4 causes the rib 2-2.3 to move away from the axial skeleton 2-2.1. The rib 2-2.3 drives the radial skeleton 2-2.2 to rotate around the connection point 2-3, and the angle between the rib 2-2.1 and the axial skeleton 2-2.1 gradually increases, which is the radial expansion of the radial skeleton 2-2.2.

[0068] In the above-mentioned Scheme II, refer to Figure 5 The radial skeleton 2-2.2 and / or the axial skeleton 2-2.1 are provided with anti-rotation blocks 2-8 near the connection point 2-3. When the radial skeleton 2-2.2 rotates to the set intersection angle with the axial skeleton 2-2.1, the excessive rotation of the radial skeleton 2-2.2 is prevented. In this embodiment, when the radial skeleton 2-2.2 rotates to the set intersection angle with the axial skeleton 2-2.1, the anti-rotation block 2-8 is located on the side opposite to the rotation direction of the radial skeleton 2-2.2, for example, below the heavy edge strip 2-2.2.1 and / or above the light edge strip 2-2.2.2.

[0069] The axial skeleton 2-2.1 can be a single, continuous piece, or multiple discrete / intersecting pieces; see reference. Figure 3 Schemes I and II can be used in combination. Multiple axial skeletons 2-2.1 are hinged through connection points 2-3, and the deflated air bladders 2-4 are bent, causing the semi-precast component 2 of the cast-in-place pile to bend and fold.

[0070] refer to Figure 4 For the radial expansion exhibited at the pile shoe ends 2-9, Schemes I and II also made adaptive matches.

[0071] refer to Figure 2 , Figure 3 and Figure 4The axial skeleton 2-2.1 extends out of the airbag 2-4 and forms a coupling 2-5. The axial skeleton 2-2.1 is rotatably connected to the airbag 2-4 through the hole through which it extends out of the airbag 2-4. The skeleton 2-2 rotates around the axial skeleton 2-2.1 (the axial direction of the airbag 2-4). The problem of concrete mixing and vibration inside the airbag 2-4 can be solved by rotating the coupling 2-5. The cross-section of the coupling 2-5 can be a geometric shape with torsion transmission capacity, such as a square head. The hole through which the axial skeleton 2-2.1 extends out of the airbag 2-4 is the filling inlet 2-1, which can reduce the number of openings in the airbag 2-4.

[0072] refer to Figure 4 When the airbag 2-4 is inflated, the airbag 2-4 and the skeleton 2-2 expand radially at the pile shoe end 2-9 of the semi-precast component 2 of the cast-in-place pile. After being made into a cast-in-place pile 3, it can improve the pile foundation bearing capacity of the cast-in-place pile 3. Example 3

[0073] This embodiment provides a pile-forming device 1, which is a further improvement on the pile-forming device 1 provided in Embodiment 1. It can also be used to manufacture the semi-precast component 2 of the cast-in-place pile provided in Embodiment 2 into a cast-in-place pile 4. For details not covered, please refer to Embodiment 1 and Embodiment 2.

[0074] refer to Figure 1 and Figure 6 The telescopic drill bit 1-6 has a soil pipe 1-12 inside. The soil pipe 1-12 and the end (or tip) of the telescopic drill bit 1-6 are connected to the outside. Specifically, an opening can be set at the end of the telescopic drill bit 1-6, and the other end of the soil pipe 1-12 can be set at a position on the telescopic drill bit 1-6 that is easy to connect to external equipment. After other external equipment or the pile-forming equipment 1 itself is connected to the soil pipe 1-12, it can directly suck up the soil deep inside the pile hole 3 through the telescopic drill bit 1-6 or spray out the soil through the opening at the end of the telescopic drill bit 1-6 which is the soil pipe 1-12.

[0075] refer to Figure 1 The telescopic drill bit 1-6 is a rotary drill bit 1-6.1. The end of the rotary drill bit 1-6.1 is provided with a coupling structure 1-6.1.1 that matches the coupling 2-5. In addition to drilling the pile hole 3, the rotary drill bit 1-6.1 can also make the coupling structure 1-6.1.1 connected to the coupling 2-5 in the second embodiment for transmission, and use the rotation of the rotary drill bit 1-6.1 to drive the frame 2-2 to mix and vibrate the concrete.

[0076] The slag pipe 1-12 and the coupling structure 1-6.1.1 can be combined. The inner contour of the slag pipe 1-12 at the end of the rotary drilling bit 1-6.1 matches the coupling 2-5. When the coupling 2-5 is inserted into the slag pipe 1-12 (or screwed in by thread), the coupling 2-5 is connected to the rotary drilling bit 1-6.1 for transmission. Specifically, for example, when the cross-section of the coupling 2-5 is a geometric shape with torsion transmission capability, such as a square head, the inner contour of the slag pipe 1-12 at the end of the rotary drilling bit 1-6.1 transitions to a geometric groove that can be connected to the coupling 2-5 for torsion transmission, such as a square head groove.

[0077] refer to Figure 1 The pile driving equipment 1 also includes a driver's cab 1-1, a satellite positioning antenna 1-2, and a satellite positioning signal processor 1-3 electrically connected to the satellite positioning antenna 1-2. The satellite positioning antenna 1-2 and the satellite positioning signal processor 1-3 are used for remote control of the planar displacement and driving of the pile driving equipment 1. The satellite positioning antenna 1-2 and the satellite positioning signal processor 1-3 are electrically connected to the driver's cab 1-1. It also includes a vehicle body 1-4 for mounting the foundations of the various components of the pile driving equipment 1. The vehicle body 1-4 has a filler injection outlet 1-7 and a filler receiving inlet 1-8 connected to the filler injection outlet 1-7. The filler receiving inlet 1-8 is located at the rear of the vehicle body 1-4 and is used to receive mud and concrete from the outside. A pneumatic control valve 1-11 is installed on the channel connecting the filler injection outlet 1-7 and the filler receiving inlet 1-8. A valve controller 1-10 for controlling the pneumatic control valve 1-11 is installed on the vehicle body 1-4. A reaction frame 1-13 is located at the bottom of the vehicle body 1-4. refer to Figure 10 and Figure 11 The telescopic drill bit 1-6 has drive turntables 1-14 at both ends. The two sides of one end of the drive turntable 1-14 are connected to the hydraulic pump 1-15. The hydraulic pump 1-15 is installed on the vehicle body 1-4. The part of the telescopic drill bit 1-6 inside the vehicle body 1-4 is threaded. The other end of the drive turntable 1-14 is connected to the thread of the telescopic drill bit 1-6. When the telescopic drill bit 1-6 is used as the observation reference, the drive turntable 1-14 rolls on the thread of the telescopic drill bit 1-6. When the drive turntable 1-14 is used as the reference, the telescopic drill bit 1-6 rotates and extends and retracts up and down. At the same time, the slag pipe 1-12 is coaxially arranged with the thread of the telescopic drill bit 1-6. The hydraulic pump 1-15 provides kinetic energy to drive the turntable 1-14 to drive the extension and retraction of the telescopic drill bit 1-6 or to drive the extension and rotation of the rotary drilling bit 1-6.1. The hydraulic pump 1-15 can be a hydraulic motor. Valve controller 1-10 is electrically connected to air compressor 1-9. When air compressor 1-9 is working, valve controller 1-10 is closed to prevent conflict between air filling and priming. Example 4

[0078] This embodiment provides a cast-in-place pile 4, in which the semi-precast component 2 of the cast-in-place pile of Embodiment 1 or Embodiment 2 has an inflated air bladder 2-4, the inflating material being concrete. The pile forming equipment 1 provided in Embodiment 1 or Embodiment 3 can be used, and the cast-in-place pile manufacturing method provided in Embodiment 5 can be used.

[0079] The cast-in-place pile 4 provided in this embodiment has better concrete quality due to the barrier of airbags 2-4 against groundwater in the pile hole 3, which solves the problem of concrete performance deterioration caused by groundwater erosion in the pile hole 3 in the prior art. Example 5

[0080] refer to Figure 8 This embodiment provides a method for manufacturing cast-in-place piles, which can be used to manufacture the cast-in-place pile 4 provided in Embodiment 4. It can be used in conjunction with the pile forming equipment 1 and the semi-prefabricated component 2 of the cast-in-place pile in Embodiments 1, 2 and 3 to manufacture the cast-in-place pile 4 provided in Embodiment 4.

[0081] Including the following steps:

[0082] An airbag 2-4 is placed inside the pile hole 3, and the pile hole 3 can be drilled by a telescopic drill bit 1-6.

[0083] The inflatable airbag 2-4 reaches the design size of the cast-in-place pile 4. A skeleton 2-2 is set inside the airbag 2-4. The airbag 2-4 can be inflated through the air inlet 1-16 (or mud can be injected through the filling outlet 1-7). The skeleton 2-2 is set so that it expands radially when the airbag 2-4 is inflated.

[0084] Concrete is injected into the airbag 2-4 to replace the expansion material inside the airbag 2-4 until the concrete reaches the design size of the cast-in-place pile 4. The injection of concrete into the airbag 2-4 can be achieved by injecting concrete into the filling inlet 2-1 through the filling outlet 1-7. The displaced expansion material includes gas or mud.

[0085] The concrete is cured until it reaches its design strength.

[0086] refer to Figure 7 Optionally, it can be further expanded:

[0087] a: Use satellite positioning signal processor 1-3 and satellite positioning antenna 1-2 to control / direct the pile driving equipment 1 to the position of the excavated pile hole 3;

[0088] b: Use rotary drill bit 1-6.1 to excavate pile hole 3. At the same time, waste mud is sucked out through slag pipe 1-12 during the process. Hub 1-5.1 moves the plane position of pile forming equipment 1 and injects high-quality mud into pile hole 3 through filling outlet 1-7. Injecting high-quality mud can prevent drill jamming and can also be used as mud wall protection outside airbag 2-4 / when airbag 2-4 is not inserted.

[0089] c: Move the hub 1-5.1 to the plane position of the pile-forming equipment 1, put the deflated airbag 2-4 into the pile hole 3, and connect the filling inlet 2-1 at the upper end of the airbag 2-4 with the filling outlet 1-7, and at the same time connect the gas exchange port 2-7 at the upper end of the airbag 2-4 with the gas supply port 1-16.

[0090] d: Inject air into the gas exchange port 2-7 of the air bag 2-4 through the air inlet 1-16 and the air compressor 1-9, and the air bag 2-4 gradually inflates;

[0091] e: Turn off the air compressor 1-9, open the air control valve 1-11, and pour concrete from the filling outlet 1-7 into the filling inlet 2-1. At the same time, air is discharged through the gas exchange port 2-7. Concrete and settled slag in the slag pipe 1-12 can also be poured at the same time (as functional pile foundation).

[0092] f: The hub 1-5.1 moves the pile-forming equipment 1 to a horizontal position. The rotary drilling bit 1-6.1 connects the coupling structure 1-6.1.1 with the coupling 2-5. Through the rotation of the rotary drilling bit 1-6.1, the frame 2-2 rotates in the air bag 2-4, causing the concrete to vibrate and compact.

[0093] g: Seal all openings of airbags 2-4 using hot-melt equipment, or cast them together with the upper structure;

[0094] h: The inferior mud in the slag pipe 1-12 will be settled, and the settled slag will be backfilled above the cast-in-place pile 4 through the slag pipe 1-12 and the rotary drilling bit 1-6.1.

[0095] i: Repeat the process of ag to complete the construction work on the entire site.

[0096] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0097] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "located in," "equipped with," "located in," "installed," "set," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0098] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A semi-precast component of a cast-in-place pile, characterized in that, The system includes an airbag (2-4) and a frame (2-2) disposed inside the airbag (2-4). When the airbag (2-4) is inflated, its shape reaches the design dimensions of the cast-in-place pile (4). The frame (2-2) is used to support the airbag (2-4) in a low-resistance state along the axial direction of the airbag (2-4) when the airbag (2-4) is deflated. The resistance of the low-resistance airbag (2-4) when inserted into the pile hole (3) is lower than the resistance when the airbag (2-4) is inflated. When the airbag (2-4) is inflated, the frame (2-2) expands radially along the airbag (2-4). The inflation material of the airbag (2-4) includes gas, mud and / or concrete. The airbag (2-4) has a gas exchange port (2-7) and a filler injection port (2-1) for injecting mud or concrete. The skeleton (2-2) includes an axial skeleton (2-2.1) extending along the axis of the airbag (2-4) and a plurality of radial skeletons (2-2.2) connected to the axial skeleton (2-2.1), and the connection points (2-3) between the radial skeletons (2-2.2) and the axial skeleton (2-2.1) are distributed along the axis of the airbag (2-4). The connection point (2-3) is a hinge point. When the airbag (2-4) is deflated, the radial frame (2-2.2) overlaps with the axial frame (2-2.1). When the airbag (2-4) is inflated, the radial frame (2-2.2) rotates and unfolds radially along the airbag (2-4). The radial frame (2-2.2) and / or the axial frame (2-2.1) are provided with anti-rotation blocks (2-8) near the connection point (2-3). The radial frame (2-2.2) includes a heavy edge strip (2-2.2.1) on one side of the axial frame (2-2.1) and a light edge strip (2-2.2.2) on the other side. The heavy edge strip (2-2.2.1) is heavier than the light edge strip (2-2.2.2). When the airbag (2-4) is inflated, the heavy edge strip (2-2.2.1) rotates downward. The connection point (2-3) is provided with a spring ring (2-3.1). The fixing point (2-3.1.1) of the spring ring (2-3.1) is connected to the radial skeleton (2-2.2) and the axial skeleton (2-2.1) respectively. When the radial skeleton (2-2.2) and the axial skeleton (2-2.1) are superimposed, the spring ring (2-3.1) is in a compressed / stretched state.

2. The semi-precast component of the cast-in-place pile according to claim 1, characterized in that, The radial skeleton (2-2.2) is movably connected to the rib (2-2.3) at one end away from the connection point (2-3), and the rib (2-2.3) is connected to the airbag (2-4) along the inner wall of the airbag (2-4).

3. The semi-precast component of the cast-in-place pile according to claim 1, characterized in that, The axial frame (2-2.1) extends through the airbag (2-4) and forms a coupling (2-5). The axial frame (2-2.1) is rotatably connected to the airbag (2-4) through the hole through which it extends.

4. The semi-precast component of the cast-in-place pile according to claim 1, characterized in that, When the airbag (2-4) is inflated, the airbag (2-4) and the skeleton (2-2) expand radially at the pile shoe end (2-9) of the semi-precast component (2) of the cast-in-place pile.

5. A pile-forming device applied to a semi-prefabricated component of the cast-in-place pile as described in claim 3, characterized in that, It includes a walking device (1-5), a telescopic drill bit (1-6) that is oriented towards the ground but at different planar positions, an air inlet (1-16), and a filler injection outlet (1-7), the filler injection outlet (1-7) being used for injecting mud or concrete; it also includes an air compressor (1-9) connected to the air inlet (1-16).

6. The pile-forming equipment according to claim 5, characterized in that, The telescopic drill bit (1-6) is a rotary drilling bit (1-6.1), and the end of the rotary drilling bit (1-6.1) is provided with a coupling structure (1-6.1.1) that matches the coupling (2-5).

7. The pile-forming equipment according to claim 6, characterized in that, The telescopic drill bit (1-6) has a slag pipe (1-12) inside, and the slag pipe (1-12) is connected to the end of the telescopic drill bit (1-6) and the outside.

8. The pile-forming equipment according to claim 7, characterized in that, The inner contour of the slag pipe (1-12) at the end of the rotary drilling bit (1-6.1) matches the coupling (2-5). When the coupling (2-5) is inserted into the slag pipe (1-12), the coupling (2-5) is connected to the rotary drilling bit (1-6.1) for transmission.

9. A cast-in-place pile, characterized in that, The invention includes a semi-precast pile as described in any one of claims 1 to 4, wherein the air bladder (2-4) is inflated and the inflating material is concrete.

10. A method for manufacturing a cast-in-place pile as described in claim 9, characterized in that, Place airbags (2-4) inside the pile hole (3); The inflatable airbag (2-4) reaches the design size of the cast-in-place pile (4), and the skeleton (2-2) expands radially when the airbag (2-4) is inflated; Concrete is poured into the airbag (2-4) to replace the inflator inside the airbag (2-4) until the concrete reaches the design size of the cast-in-place pile (4).

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