A tubular cast-in-place pile forming device and method for bearing horizontal load

Abstract

The present application provides a kind of tubular bored pile device and method for bearing horizontal load, belong to energy-saving building material production technical field.The device includes outer casing, telescopic positioner and inner casing, telescopic positioner is set in bottom, inner casing bottom is rotationally engaged with telescopic positioner, inner casing outside is provided with stirring structure, steel fiber reinforced concrete is filled between the tubular layer of outer casing and inner casing, and is clamped by clamping drive structure to rotate inner casing, to form the effect of stirring steel fiber reinforced concrete, finally by inner and outer casing and concrete solidification into pile.The device combines with the method, compared with traditional bored pile, can save reinforcement cage, reduce the consumption of steel, also can simplify the process of bored pile into pile, reduce construction energy consumption.At the same time, the building bored pile material produced by the method also has good mechanical properties, can bear larger horizontal load.

Description

Technical Field

[0001] This invention belongs to the field of energy-saving building material production technology, and in particular relates to a tubular cast-in-place pile forming device and method for bearing horizontal loads. Background Technology

[0002] Concrete piles are commonly used building materials in construction engineering, often serving as load-bearing foundations to withstand horizontal or axial loads. For example, when piles are used as load-bearing foundations, they bear the loads of the superstructure, primarily axial forces. When piles are installed around underground structures, such as near subways, they are also subjected to horizontal loads, which, due to differences in magnitude and direction at different horizontal levels, often manifest as shear forces on the pile body. Currently, concrete piles are constructed in two ways: factory-produced and transported to the site for insertion into the soil, and directly by excavating and pouring concrete on-site. For piles with larger lengths and diameters, due to transportation difficulties, on-site pouring is generally preferred.

[0003] For cast-in-place piles that primarily bear horizontal loads, the center of the pile cross-section has a relatively small impact on the actual load-bearing capacity. Using a tubular configuration for cast-in-place piles is beneficial for material conservation, significantly reducing the amount of concrete used. In traditional construction methods, when using tubular configuration cast-in-place piles, a dense steel cage needs to be inserted within the thickness of the tubular structure to ensure its strength. Because the length and diameter of the steel cage are matched to the cast-in-place pile, the cage is also very heavy and large, making the installation process extremely complex. This requires the assistance and coordination of various cranes and other equipment, consuming a large amount of steel, and resulting in a complex, energy-intensive, and costly pile-forming process, leading to serious waste of materials and energy. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a tubular cast-in-place pile forming device and method for bearing horizontal loads, so as to solve the problem of serious material and energy consumption in the existing tubular cast-in-place pile forming process for bearing horizontal loads.

[0005] To achieve the above and other related objectives, the present invention provides a tubular cast-in-place pile forming device and method for bearing horizontal loads.

[0006] One of them is a tubular cast-in-place pile forming device that bears horizontal loads, used for grouting cast-in-place piles in boreholes, comprising:

[0007] A telescopic locator installed at the bottom of the borehole and concentric with the borehole;

[0008] An outer protective sleeve whose outer wall matches the drill hole and whose bottom is engaged and limited by the telescopic locator;

[0009] In addition, there is an inner casing concentric with the outer casing and rotating with the telescopic locator. The area between the outer casing and the inner casing is a grouting zone, which is filled with steel fiber reinforced concrete. The inner casing is provided with a mixing structure on the side facing the grouting zone. A clamping drive structure is provided at the ground surface of the borehole, which can clamp and drive the inner casing to rotate.

[0010] Optionally, the inner casing includes a support layer and a stirring layer. A sling is provided on the top of the stirring layer. The stirring layer is slidably sleeved on the outside of the support layer. The stirring structure is disposed on the stirring layer. The clamping drive structure cooperates with the stirring layer.

[0011] Optionally, the stirring structure is a steel rod.

[0012] Optionally, the stirring structure is a stirrer located on the outer periphery of the bottom of the stirring layer, and the stirrer is provided with a slurry inlet channel and a slurry outlet channel;

[0013] The grouting channel is equipped with a shovel at its entrance. The grouting channel is a gentle slope, and the concrete grout enters from the entrance and slowly rises through the grouting channel.

[0014] The discharge channel is located at the end of the inlet channel, and the discharge channel slopes downwards and is open at the bottom.

[0015] Optionally, a screen is provided at the entrance of the slurry inlet channel.

[0016] Optionally, the mesh size of the screen is larger than the length of the steel fibers in the concrete.

[0017] Optionally, the mixer body is equipped with an ultrasonic detector, which faces the slurry inlet channel and can detect the distribution of steel fibers in the concrete.

[0018] Optionally, a coil group is vertically arranged in the middle of the slurry outlet channel, and the coil group generates a vertical magnetic field to orient the steel fibers in the concrete.

[0019] Optionally, the telescopic positioning device includes a main body disc and a telescopic rod. The upper side of the main body disc is provided with a groove that mates with the inner protective sleeve. The telescopic rod is located radially to the main body disc and slides through the main body disc from the outside to be inserted into the groove. Both ends of the telescopic rod have chamfers. When the inner protective sleeve is lowered and inserted into the groove, it squeezes and pushes out the telescopic rod. The bottom of the outer protective sleeve is provided with a groove that mates with the telescopic rod.

[0020] The clamping drive structure includes a body, a clamping block, an adjusting rod, a gear disk, and a power source. The body is fixedly installed at the surface of the borehole. The gear disk is rotatably installed on the body and concentric with the inner protective sleeve. The power source drives the gear disk to rotate through a gear pair. The clamping block is slidably disposed on the gear disk and the sliding direction is along the radial direction of the gear disk. The adjusting rod is disposed behind the clamping block, and the end of the adjusting rod is connected to the gear disk through a threaded hole.

[0021] One method for constructing a tubular cast-in-place pile subjected to horizontal loads, using the aforementioned pile-construction device, includes the following steps:

[0022] Drill holes at the designated pile locations;

[0023] The telescopic locator is placed at the center of the bottom of the borehole;

[0024] The outer protective sleeve is inserted into the drill hole and engaged with the telescopic positioner for limiting its position.

[0025] The inner casing is inserted into the borehole, the bottom of the inner casing is rotatably engaged with the telescopic locator, and the top of the inner casing is engaged with the clamping drive structure.

[0026] The grouting zone is filled with steel fiber reinforced concrete and is stirred by the mixing structure on the inner protective casing driven by the clamping drive structure.

[0027] The main pile components are retained while the auxiliary construction components are removed, and the concrete is allowed to solidify into a pile.

[0028] As described above, the tubular cast-in-place pile forming device and method for bearing horizontal loads according to the present invention have at least the following beneficial effects:

[0029] Compared to traditional pile-forming processes, the device and method provided by this invention can produce higher-strength building piles with less material and energy consumption. Specifically, the device includes an outer casing, a telescopic locator, and an inner casing. The telescopic locator is located at the bottom, and the inner casing rotates in conjunction with it. The inner casing is equipped with a mixing structure. Steel fiber reinforced concrete is filled between the tubular layers of the outer and inner casings, and a clamping drive structure clamps and rotates the inner casing, thus creating a mixing effect on the steel fiber reinforced concrete. This device and method, compared to traditional cast-in-place piles, saves on reinforcing cages, reduces steel consumption, simplifies the pile-forming process, and lowers construction energy consumption. Furthermore, the cast-in-place pile material produced by this method has better performance and can withstand larger horizontal loads. Attached Figure Description

[0030] Figure 1 The diagram shows the state of the present invention in a borehole.

[0031] Figure 2 This is a schematic diagram showing the overall state of the present invention.

[0032] Figure 3 The image shown is a three-dimensional schematic diagram of the clamping drive structure of the present invention.

[0033] Figure 4 The diagram shown is a top view of the clamping drive structure of the present invention.

[0034] Figure 5 The image shown is a side-view perspective of the stirrer of this invention.

[0035] Figure 6 The image shown is a top-view perspective view of the stirrer of this invention.

[0036] Figure 7 The diagram shown is a schematic of the telescopic positioner of the present invention.

[0037] Figure 8 The diagram shows the magnetic field distribution of the coil group of the present invention.

[0038] Figure 9 The diagram shows the orientation of the steel fibers in the stirrer of this invention.

[0039] The components include: telescopic positioning device 3, main body disc 30, groove 301, telescopic rod 31, outer protective casing 2, inner protective casing 4, support layer 40, mixing layer 41, lifting cable 410, grouting area 5, steel rod 10, agitator 11, slurry inlet channel 111, shovel 1110, gentle slope 1112, screen 1113, slurry outlet channel 112, coil group 1121, ultrasonic detector 113, clamping drive structure 6, machine body 60, clamping block 61, adjusting rod 62, gear disc 63, power source 64, and steel fiber 99. Detailed Implementation

[0040] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0041] Please see Figures 1 to 9It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0042] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.

[0043] Please refer to this embodiment. Figure 1 The present invention provides an embodiment of a tubular cast-in-place pile forming device for bearing horizontal loads, used for grouting cast-in-place piles in boreholes, comprising: a telescopic locator 3 disposed at the bottom of the borehole and concentric with the borehole; an outer casing 2 whose outer wall matches the borehole and whose bottom is engaged with and limited by the telescopic locator 3, the engagement and limitation preventing the telescopic locator 3 from rotating; specifically, a protrusion can be provided on the outer periphery of the telescopic locator 3, and a groove can be provided on the bottom of the outer casing 2, the engagement and limitation being achieved by the cooperation of the protrusion and the groove; and an inner casing 4 concentric with the outer casing 2 and whose bottom is rotatably engaged with the telescopic locator 3. Between the outer casing 2 and the inner casing 4 is the grouting zone 5, which is filled with steel fiber reinforced concrete. Steel fiber reinforced concrete is a reinforced composite material formed by adding short steel fibers to ordinary concrete. The length and diameter of the steel fibers can be determined as needed, ranging from several millimeters to tens of millimeters in length and around 1 millimeter in diameter. Due to the reinforcement, toughening, and crack resistance of the matrix by the steel fibers, the mechanical properties and durability of the concrete are greatly improved. However, using steel fiber reinforced concrete increases the difficulty of mixing the concrete materials, and using conventional methods for pile formation will lead to difficulties in ensuring quality. Therefore, in this embodiment, a mixing structure is provided on the side of the inner casing 4 facing the grouting zone 5, and a clamping drive structure 6 is provided at the surface of the borehole. The clamping drive structure 6 can clamp and drive the inner casing 4 to rotate, thereby preparing and mixing the steel fiber reinforced concrete on site. In practice, the mixing structure can be a steel rod 10 vertically welded to the surface of the inner casing 4. The inner casing 4 rotates to drive the steel rod 10 to mix the grouting area 5. After the mixing is completed, the inner and outer casings and the steel rod 10 are solidified with the steel fiber concrete to form the final grouting pile.

[0044] The advantages of the above embodiments are that, compared with traditional cast-in-place pile construction methods, they overcome the problems of traditional processes. For example, as the length and diameter of cast-in-place piles continue to increase, the volume of the reinforcing cage becomes excessive, resulting not only in a large consumption of steel but also increasing the complexity of the pile construction process. The reinforcing cage is also prone to damage during hoisting, affecting the final mechanical properties of the pile. The above embodiments, by employing a double-layer pipe pile plus steel fiber reinforced concrete method, not only reduce steel consumption but also decrease the amount of concrete used, while ensuring the overall quality of the pile construction and guaranteeing that the mechanical properties of the pile meet the requirements of the application scenario.

[0045] Furthermore, the inner casing 4 includes a support layer 40 and a mixing layer 41. A sling 410 is provided on the top of the mixing layer 41. The mixing layer 41 is slidably sleeved on the outside of the support layer 40. The mixing structure is set on the mixing layer 41, and the clamping drive structure 6 cooperates with the mixing layer 41. In this embodiment, since the mixing layer 41 is slidably sleeved on the outside of the support layer 40, after the mixing work is completed and before the concrete solidifies, the mixing layer 41 can be lifted by the top sling 410 to retrieve the mixing layer. The outer casing 2 and the support layer 40 form the final cast-in-place pile, further saving material consumption.

[0046] Please refer to this embodiment. Figure 2 , Figure 5 and Figure 6 This embodiment provides another mixing structure, which is a mixer 11 located on the outer periphery of the bottom of the mixing layer 41. The mixer 11 has an inlet channel 111 and an outlet channel 112. A shovel 1110 is provided at the inlet of the inlet channel 111 to facilitate the loading of concrete into the mixer during the rotation of the mixer 11. The inlet channel 111 is a gentle slope 1112, which extends the flow path of the concrete slurry and reduces the drastic degree of height change. The outlet channel 112 is located at the end of the inlet channel 111. The outlet channel 112 is steeply downward and open at the bottom. Once the concrete slurry reaches the top of the outlet channel 112, it flows vertically downward and leaves the mixer. When the mixer 11 rotates with the mixing layer 41, the concrete slurry enters from the inlet of the inlet channel 111, slowly rises through the inlet channel 111, and falls at the end of the inlet channel 111 through the outlet channel 112, thus leaving the mixer 11. A cover plate can be installed on the upper part of the stirrer 11 to form a closed channel. The cover plate is not shown in the attached figure for easy observation of the internal structure of the stirrer.

[0047] Now combined Figure 9The beneficial effects of the above process will be explained. Assume that the steel fiber reinforced concrete poured into the grouting zone 5 has been pre-mixed, meaning that the steel fibers 99 are randomly distributed in the concrete slurry. When the steel fiber reinforced concrete containing randomly distributed steel fibers 99 flows through the mixer 11, the steel fibers 99 within it will tend to distribute along its flow direction. Thus, at the slurry outlet channel 112, the steel fibers 99 in the steel fiber reinforced concrete exiting the mixer will tend to be vertically distributed. This is because, during the flow of the mixture, the mixture exerts shear force on the steel fibers, causing the steel fibers 99 to rotate and tend to align with the flow direction of the mixture. Specifically, when the mixture flows through the narrow slurry channel within the mixer, due to the friction between the sidewalls and the fluid, the flow velocity at various points gradually increases from zero at the sidewalls to a maximum value at the centerline of the channel. The presence of a velocity difference causes the two ends of the steel fibers 99, which are not aligned with the flow direction of the mixture, to move at different speeds. The end with the higher velocity will rotate towards the end with the lower velocity, causing the steel fibers to tend to orient themselves along the velocity gradient and ultimately distribute along the flow direction of the mixture. In this embodiment, multiple stirring operations using the rotating mixer 11 ensure that most of the steel fibers in the final steel fiber reinforced concrete are vertically distributed. This improves the overall ability of the cast-in-place pile to withstand horizontal loads and provides strong resistance to shear forces caused by differential loads at different horizontal depths. This is because the vertically distributed steel fibers 99 are perpendicular to the direction of the horizontal load, allowing the shear forces exerted on the pile by the horizontal load to be absorbed by the steel fibers, thus preventing pile cracking.

[0048] Please refer to this embodiment. Figure 5 and Figure 6A screen 1113 is installed at the entrance of the grout inlet channel 111. The mesh size of the screen 1113 is larger than the length of the steel fibers in the concrete. The flow direction of the concrete grout is perpendicular to the screen surface. When the flow direction of the steel fibers in the concrete is the same as that of the concrete grout, the steel fibers 99 are also perpendicular to the screen surface, and the projection of the steel fibers 99 onto the screen surface is a point, so the screen does not obstruct the passage of the steel fibers 99. When the steel fibers 99 form a certain angle with the flow direction of the concrete grout, the projection of the steel fibers 99 onto the screen surface is a line segment. And when the steel fibers 99 are perpendicular to the flow direction of the concrete grout, the projection of the steel fibers 99 onto the screen surface is the actual shape of the steel fibers 99. At this time, the length of the projection of the steel fibers 99 onto the screen surface is the longest. In other words, the probability of the steel fibers 99 being intercepted by the screen is greater. Because the mesh size of screen 1113 is larger than the length of the steel fibers in the concrete, for most steel fibers 99, when the screen blocks them, the fibers will rotate around the point of contact with the screen under the push of the slurry, eventually tending to flow in the same direction as the concrete slurry and pass through screen 1113. The larger mesh size of screen 1113 prevents the steel fibers 99 from accumulating and clogging due to ineffective rotation. Once the steel fibers 99 reach the outlet channel 112 along the flow direction of the concrete slurry, the flow direction becomes downward, and the steel fibers 99 in the concrete slurry tend to be vertically distributed. After the steel fiber reinforced concrete has solidified, it will have good horizontal load-bearing capacity and is less prone to cracking when subjected to horizontal shear forces.

[0049] Please refer to this embodiment. Figure 6 and Figure 9 An ultrasonic detector 113 is installed in the body of the mixer 11, facing the grout channel 111 and capable of detecting the distribution of steel fibers in the concrete. During the mixing process of the steel fiber reinforced concrete, as the number of mixing cycles increases, the distribution direction of the steel fibers 99 tends to become more uniform. However, in actual engineering, more vertically distributed steel fibers 99 are not necessarily better; it depends on the actual stress conditions of the pile. Steel fibers can withstand large loads perpendicular to the fibers. In actual engineering, the stress environment of the pile is complex, requiring not only vertically distributed steel fibers but also horizontally distributed steel fibers and some randomly distributed steel fibers. The ultrasonic detector 113 can detect the specific gravity of steel fibers in various directions within the concrete. It mainly utilizes physical principles such as electromagnetic waves or ultrasound, sending signals through a probe into the fluid mixture and then receiving the reflected signals to determine the distribution of steel fibers within the mixture. When the specific gravity of steel fibers in each direction reaches a suitable level, mixing can be stopped to prevent insufficient or excessive mixing that would fail to meet the actual stress conditions of the cast-in-place pile.

[0050] Please refer to this embodiment. Figure 5 , Figure 6 and Figure 8 A coil assembly 1121 is vertically arranged in the middle of the grout outlet channel 112. The coil assembly 1121 generates a vertical magnetic field and orients the steel fibers in the concrete. In this embodiment, the steel fibers 99 can be pre-magnetized steel fibers, or they can be magnetized when passing through both sides of the coil assembly 1121 during the stirring process. Once the steel fibers 99 are magnetized, they become small magnetic needles with their two ends magnetized as N poles and S poles. When they pass through both sides of the coil assembly 1121, they are exposed to the magnetic field generated by the coils. The two poles are simultaneously subjected to equal and opposite magnetic field forces. Driven by the magnetic force, the steel fibers rotate to be parallel to the direction of the magnetic field, thereby achieving orientation, that is, vertical orientation, thus improving the horizontal load bearing capacity of the pile.

[0051] For this embodiment, please refer to Figure 7 The telescopic positioning device 3 includes a main body disc 30 and a telescopic rod 31. The main body disc 30 has a groove 301 on its upper side that mates with the inner casing 4. The telescopic rod 31 is located radially to the main body disc 30 and slides through the main body disc 30 from the outside, inserting into the groove 301. Both ends of the telescopic rod 31 have chamfers. When the inner casing 4 is lowered and inserted into the groove 301, it squeezes and pushes out the telescopic rod 31. The bottom of the outer casing 2 has a groove that mates with the telescopic rod 31. Before the telescopic rod 31 is squeezed out by the inner casing 4, its outer end is flush with the outer wall of the outer casing 2 and inserted into the groove. When the inner casing 4 is lowered and inserted into the groove 301, it squeezes and pushes out the telescopic rod 31, which extends beyond the outer wall of the outer casing 2 and inserts into the borehole soil layer, thus increasing stability to a certain extent. The telescopic rod 31 enables the telescopic locator 3 and the outer casing 2 to be fixed together. It also reduces the diameter of the main body disc 30 of the telescopic locator 3, saving steel. At the same time, it allows the concrete grout to directly contact the soil layer, penetrate into the soil layer, and enhance the embedment state between the pile and the soil layer.

[0052] Combination Figure 3 and Figure 4The clamping drive structure 6 includes a body 60, a clamping block 61, an adjusting rod 62, a gear disk 63, and a power source 64. The body 60 is fixedly installed at the borehole surface. The gear disk 63 is rotatably installed on the body 60 and concentric with the inner protective sleeve 4. The power source 64 drives the gear disk 63 to rotate through a gear pair. Multiple power sources 64 can be set to drive the gear disk 63 synchronously, thereby reducing the volume of a single power source 64. For example, three power sources 64 can be set at equal intervals, which can also improve the stability of the drive and balance the driving force on the gear disk 63. The clamping block 61 is slidably installed on the gear disk 63, and the sliding direction is radial along the gear disk 63. The adjusting rod 62 is rotatably installed behind the clamping block 61. The end of the adjusting rod 62 is connected to the gear disk 63 through a threaded hole. By turning the adjusting rod 62, the clamping or loosening state can be controlled. The clamping block 61 and the adjusting rod 62 are connected by rotation. When the adjusting rod 62 is turned, the clamping block 61 maintains its original direction and will not flip. Three sets of support blocks are also provided on the lower side of the gear disk 63. Their support structure is the same as that of the clamping block 61, but they are only used for centering support rather than clamping. The support blocks are in sliding contact with the inner protective sleeve 4 and will not hinder the rotation of the inner protective sleeve 4. By separating the rotation support structure and the clamping drive design, the stability of support and drive can be improved.

[0053] The pile driving process using the aforementioned pile driving device includes the following steps:

[0054] First, a borehole is drilled at the predetermined pile location as the pile hole. Then, the telescopic locator 3 is placed at the center of the bottom of the borehole for positioning. Subsequently, the outer casing 2 is placed into the borehole and engages with the telescopic locator 3 for limiting its movement. Specifically, the telescopic rod 31 or protrusion on the outer periphery of the telescopic locator 3 is engaged in the groove at the bottom of the outer casing 2, thereby restricting the relative rotation between the outer casing 2 and the telescopic locator 3. Next, the inner casing 4 is placed into the borehole, with its bottom engaging with the telescopic locator 3. That is, the bottom of the inner casing 4 is inserted into the groove 301 at the top of the telescopic locator 3, allowing the inner casing 4 to rotate within the groove 301. The top of the inner casing 4 engages with the clamping drive structure 6, with three sets of support blocks providing rotational support for the inner casing 4. The clamping block 61 clamps the inner casing 4, which rotates around the borehole axis under the drive of the power source 64. After the grouting zone 5 is filled with steel fiber reinforced concrete, the clamping drive structure 6 drives the mixing structure on the inner casing 4 to mix. Previous embodiments provided two mixing structures: one is to weld steel rods directly onto the casing, and the other is to install a mixer at the bottom of the casing. When using welded steel rods, the steel fibers can be mixed, suitable for scenarios where the direction of steel fiber distribution is not critical. If the direction of steel fiber distribution needs to be controlled, a mixer is required. When using a mixer, the mixer is installed at the bottom of the inner casing 4, and a double-layer inner casing 4 is required. The steel fiber concrete can be added and mixed layer by layer. For example, after pouring steel fiber concrete at a certain height, the mixing layer 41 of the inner casing 4 is lifted and moved upwards, so that the bottom mixer is positioned precisely at the top layer of the steel fiber concrete slurry. Then, the clamping drive structure 6 drives the mixer to rotate, causing the concrete slurry to circulate between the mixer's inlet channel 111 and outlet channel 112. The more times it circulates, the more vertically distributed steel fibers are present in the steel fiber concrete. After the distribution of steel fibers in the concrete is detected and identified by ultrasonic detector 113 and meets the requirements, the inner casing 4 and the mixer are moved upwards. Steel fiber reinforced concrete is then added and mixed at the new height layer. This process of moving upwards layer by layer not only ensures that the steel fibers in the concrete are fully mixed but also allows for the orientation of the steel fibers. Furthermore, it allows for control of the concentration and direction of steel fibers at different height layers based on the actual load-bearing capacity of the cast-in-place pile, reducing material consumption and improving pile quality. After construction, the pile body components, mainly the inner and outer casings, are retained; auxiliary construction components, mainly the clamping and driving devices, are removed. When using a double-layer inner casing, the mixing layer can also be removed. The pile is then allowed to solidify.

[0055] In summary, the present invention effectively overcomes the various shortcomings of the prior art, produces beneficial technical effects, and has made significant progress.

[0056] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A tubular cast-in-place pile forming device for bearing horizontal loads, used for casting cast-in-place piles in boreholes, characterized in that, include: A telescopic locator (3) is located at the bottom of the borehole and concentric with the borehole; an outer casing (2) has an outer wall that matches the borehole and a bottom that engages with and limits the telescopic locator (3); and an inner casing (4) is concentric with the outer casing (2) and rotatably engages with the telescopic locator (3). A grouting zone (5) is located between the outer casing (2) and the inner casing (4). The grouting zone (5) is filled with steel fiber reinforced concrete. The inner casing (4) is positioned on the side facing the grouting zone (5). The inner casing (4) has a stirring structure and a clamping drive structure (6) is provided at the surface of the borehole, which can clamp and drive the inner casing (4) to rotate. The inner casing (4) includes a support layer (40) and a stirring layer (41). A sling (410) is provided on the top of the stirring layer (41). The stirring layer (41) is slidably sleeved on the outside of the support layer (40). The stirring structure is provided on the stirring layer (41). The clamping drive structure (6) cooperates with the stirring layer (41).

2. The tubular cast-in-place pile forming device for bearing horizontal loads as described in claim 1, characterized in that, The stirring structure is a steel rod (10).

3. The tubular cast-in-place pile forming device for bearing horizontal loads as described in claim 1, characterized in that: The mixing structure is a mixer (11) located on the outer periphery of the bottom of the mixing layer (41). The mixer (11) is provided with an inlet channel (111) and an outlet channel (112). A shovel (1110) is provided at the entrance of the inlet channel (111). The inlet channel (111) is a gentle slope (1112). After entering from the entrance, the concrete slurry slowly rises through the inlet channel (111). The outlet channel (112) is located at the end of the inlet channel (111). The outlet channel (112) is steeply downward and open at the bottom.

4. The tubular cast-in-place pile forming device for bearing horizontal loads as described in claim 3, characterized in that, A screen (1113) is provided at the entrance of the slurry inlet channel (111).

5. The tubular cast-in-place pile forming device for bearing horizontal loads as described in claim 4, characterized in that, The mesh size of the screen (1113) is larger than the length of the steel fibers in the concrete.

6. The tubular cast-in-place pile forming device for bearing horizontal loads as described in claim 3, characterized in that, An ultrasonic detector (113) is provided in the body of the mixer (11), the ultrasonic detector (113) is oriented toward the grout inlet channel (111) and can detect the distribution of steel fibers in the concrete.

7. The tubular cast-in-place pile forming device for bearing horizontal loads as described in claim 3, characterized in that, A coil group (1121) is vertically arranged in the middle of the slurry outlet channel (112). The coil group (1121) generates a vertical magnetic field and orients the steel fibers in the concrete.

8. The tubular cast-in-place pile forming device for bearing horizontal loads as described in claim 1, characterized in that: The telescopic positioning device (3) includes a main body disc (30) and a telescopic rod (31). The upper side of the main body disc (30) is provided with a groove (301) that mates with the inner protective sleeve (4). The telescopic rod (31) is located radially on the main body disc (30) and slides through the main body disc (30) from the outside and is inserted into the groove (301). Both ends of the telescopic rod (31) are chamfered. When the inner protective sleeve (4) is lowered and inserted into the groove (301), it squeezes and pushes out the telescopic rod (31). The bottom of the outer protective sleeve (2) is provided with a groove that mates with the telescopic rod (31). The clamping drive structure (6) includes a machine The machine body (60), clamping block (61), adjusting rod (62), gear disk (63), and power source (64) are fixedly installed at the surface of the borehole. The gear disk (63) is rotatably installed on the machine body (60) and concentric with the inner protective sleeve (4). The power source (64) drives the gear disk (63) to rotate through a gear pair. The clamping block (61) is slidably disposed on the gear disk (63) and the sliding direction is along the radial direction of the gear disk (63). The adjusting rod (62) is rotatably disposed behind the clamping block (61), and the end of the adjusting rod (62) is connected to the gear disk (63) through a threaded hole.

9. A method for constructing tubular cast-in-place piles subjected to horizontal loads, characterized in that, The pile-forming device as described in claim 8 includes the following steps: drilling a borehole at a predetermined pile-forming position; placing the telescopic locator (3) at the center of the bottom of the borehole; placing the outer casing (2) into the borehole and engaging with the telescopic locator (3) for positioning; placing the inner casing (4) into the borehole, with the bottom of the inner casing (4) rotatably engaging with the telescopic locator (3) and the top of the inner casing (4) engaging with the clamping drive structure (6); filling the grouting zone (5) with steel fiber reinforced concrete and having the mixing structure on the inner casing (4) stirred by the clamping drive structure (6); retaining the pile body components and removing the auxiliary construction components, and allowing the concrete to solidify into a pile.

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