A type of mold for a silicate-calcium slag-based cementitious material mixed soil precast pile and a use method thereof

Abstract

This invention relates to the field of precast pile forming equipment technology, specifically disclosing a mold for precast piles made of calcium silicate slag-based cementitious material mixed with soil and rock, and its usage method. The mold includes a rotating shaft and a base. The base and the bottom end of a guide frame are fixedly connected. A sliding support and a mounting seat are installed on the guide frame. A drive mechanism for moving the support is installed on the base. The support is located above the mounting seat. A housing is fixed on the mounting seat. A power mechanism for rotating the rotating shaft is installed on the support. A spiral blade is installed on the rotating shaft. This mold for precast piles made of calcium silicate slag-based cementitious material mixes the soil and calcium silicate slag-based cementitious material evenly, reducing the porosity of the precast pile. The resulting precast pile has high strength, low permeability, and good durability. The method of using this mold for precast piles made of calcium silicate slag-based cementitious material mixed with soil is convenient to operate and facilitates continuous construction.

Description

Technical Field

[0001] This invention relates to the technical field of precast pile forming equipment, belonging to the category of energy-saving building material production equipment, specifically a mold for precast piles made of silicon-calcium slag-based cementitious materials mixed with soil and rock, and its usage method. Background Technology

[0002] With the increasing demands on foundation bearing capacity in construction projects, existing foundation treatment technologies suffer from problems such as high resource consumption and severe construction pollution. Spiral mixing piles are a common technology for reinforcing soft soil foundations. The construction process of spiral mixing piles involves spiral drilling, injecting cement or cement slurry into the soil layer, and mixing the soil with cement or cement slurry. However, this process has the following problems: the mixing range of the spiral drill bit is limited, the soil in the hole cannot be mixed vertically, and there are weak interfaces inside the pile body, resulting in large dispersion of the pile's compressive strength. Summary of the Invention

[0003] The technical problem to be solved by this invention is to overcome the existing defects and provide a mold and method for using precast piles made of calcium silicate slag-based cementitious material mixed with soil and rock. This mold for precast piles made of calcium silicate slag-based cementitious material mixes the soil and calcium silicate slag-based cementitious material evenly, reduces the porosity of the precast pile, and results in precast piles with high strength, low permeability, good durability, and small strength dispersion. It also reduces the number of piles required to achieve the same total bearing capacity, saving energy consumption in mechanical construction. The method for using this mold for precast piles made of calcium silicate slag-based cementitious material mixed with soil and rock is convenient to operate and facilitates continuous construction.

[0004] The technical solution adopted by this invention to solve its technical problem includes: On one hand, a mold for precast piles of mixed soil and rock using calcium silicate slag-based cementitious material is provided, including a rotating shaft and a base. The base and the bottom end of a guide frame are fixedly connected. A sliding support and a mounting seat are installed on the guide frame. A drive mechanism for moving the support is installed on the base. The support is located above the mounting seat. A housing is fixed on the mounting seat. A power mechanism for rotating the rotating shaft is installed on the support. A spiral blade is installed on the rotating shaft.

[0005] The housing includes a conical housing, a tubular housing, a plug, and a fixing component. The cross-sectional area of ​​the inner cavity of the conical housing gradually decreases from top to bottom. The bottom end of the conical housing is connected to the top end of the tubular housing. A tube is installed in the middle of the inner cavity of the conical housing, and a gap is provided between the bottom end of the tube and the inner wall of the conical housing.

[0006] The bottom end of the tubular shell contacts the surface of the soil layer, the helical blades rotate in the forward direction, and the bottom end of the helical blades passes downward through the inner cavity of the tube and the inner cavity of the tubular shell and enters the soil layer. The helical blades transport the soil below the tubular shell into the conical shell, and add a calcium silicate slag-based cementitious material into the conical shell. The calcium silicate slag-based cementitious material and the soil in the conical shell are mixed to obtain a mixture.

[0007] In this process, the helical blades move upward and leave the soil layer, with the bottom end of the helical blades located inside the tubular shell. The plugging component is installed at the bottom end of the tubular shell by a fixing component. The helical blades rotate in the opposite direction, and the compacted mixture inside the tubular shell pushes open or breaks the plugging component.

[0008] As a preferred embodiment of the present invention, the blocking component is a metal plate or a plastic plate, the top side of the fixing component has a groove, the middle position of the bottom side of the groove has a through hole, the edge of the bottom side of the blocking component contacts the edge of the bottom side of the groove, and the groove of the fixing component and the bottom end of the tubular shell are detachably connected.

[0009] As a preferred embodiment of the present invention, the middle part of the top side of the plugging member is recessed downward.

[0010] As a preferred embodiment of the present invention, the top or bottom side of the blocking member is provided with a plurality of narrow grooves passing through the middle position of the blocking member.

[0011] As a preferred embodiment of the present invention, the bottom end of the rotating shaft is provided with an elongated groove, and a detachable clip is installed at the bottom end of the elongated groove.

[0012] Before the plugging component is installed at the bottom of the tubular shell by the fixing component, the clip at the bottom of the long groove is removed, and the reinforcing bar is inserted into the long groove.

[0013] As a preferred embodiment of the present invention, the vertical distance between the bottom end of the tube and the inner wall of the conical shell is greater than 2.0 cm.

[0014] As a preferred embodiment of the present invention, the guide frame is provided with a plurality of locking holes along the vertical direction, and at least one locking hole is provided with a limiting pin.

[0015] As a preferred embodiment of the present invention, the support and one end of the connecting rope are fixedly connected, and the other end of the connecting rope is equipped with a hook.

[0016] As a preferred embodiment of the present invention, both the outer periphery of the conical shell and the outer periphery of the tubular shell are fixed with reinforcing ribs.

[0017] On the other hand, a method for using a mold for precast piles made of silica-calcium slag-based cementitious materials in mixed soil and rock is also provided, which includes the following steps: The bottom end of the tubular shell is in contact with the surface of the soil layer. The power mechanism drives the helical blade to rotate forward through the rotating shaft. The drive mechanism drives the helical blade to move downward through the support and rotating shaft. The bottom end of the helical blade passes downward through the inner cavity of the tube and the inner cavity of the tubular shell and enters the soil layer. The helical blade transports the soil below the tubular shell into the conical shell. Silica-calcium slag-based cementitious material is added into the conical shell. The silica-calcium slag-based cementitious material and soil in the conical shell are mixed to obtain a mixture.

[0018] The drive mechanism drives the spiral blades upward through the support and the rotating shaft, so that the spiral blades leave the soil layer and the bottom end of the spiral blades is located inside the tubular shell.

[0019] The blocking component is installed at the bottom of the tubular shell by a fixing component. The power mechanism drives the spiral blade to rotate in the opposite direction through the rotating shaft. The mixture inside the tubular shell is compacted at the bottom of the inner cavity of the tubular shell. The compacted mixture inside the tubular shell pushes open or breaks the blocking component.

[0020] Compared with the prior art, the beneficial effects of the present invention are: 1. The mold for precast piles made of calcium silicate slag-based cementitious material mixed with soil and rock, as exemplified by the present invention, achieves in-situ production of precast piles through a three-step method of soil sampling, mixing, and compaction. The soil and calcium silicate slag-based cementitious material are mixed evenly, and the ratio of calcium silicate slag-based cementitious material, water, and soil can be precisely controlled. This eliminates the strength dispersion problem caused by changes in strata, uneven grouting, and unstable stirring blade speed. Furthermore, the compaction of the mixture of soil and calcium silicate slag-based cementitious material removes excess air, reduces the porosity of the precast pile, and results in precast piles with high strength, low permeability, and good durability.

[0021] 2. The mold for precast piles made of calcium silicate slag-based cementitious material mixed with soil and rock, as exemplified by this invention, causes minimal compression deformation of the surrounding soil, does not cause ground heave, and has little impact on adjacent buildings and underground pipelines. Under the premise of ensuring the strength of the precast pile, the calcium silicate slag-based cementitious material is fully mixed with the soil, reducing the amount of calcium silicate slag-based cementitious material used and avoiding waste. Due to the small dispersion of the strength of the precast pile, fewer piles are required to achieve the same total bearing capacity, saving energy consumption in mechanical construction.

[0022] 3. In the example of the present invention, the mold for precast piles of mixed soil and rock using silicon-calcium slag-based cementitious material is used. Before the plugging component is installed at the bottom end of the tubular shell by the fixing component, the clamp at the bottom end of the long groove is removed, and the long groove is filled with reinforcing bars. The mixture inside the tubular shell is filled with reinforcing bars during the compaction process to enhance the strength of the precast pile.

[0023] 4. In the example of the present invention, the mold for precast piles made of silica-calcium slag-based cementitious material mixed with soil and rock has a spiral component inside the precast pile, which improves the strength of the precast pile.

[0024] 5. The method of using the mold for precast piles made of calcium silicate slag-based cementitious material in the mixed soil and rock of the present invention allows for on-demand soil extraction, quantitative mixing, and precise insertion into boreholes after precast pile curing. This improves the utilization rate of calcium silicate slag-based cementitious material, eliminates the need for a pumping system, has high equipment integration, and facilitates continuous construction by workers. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of an embodiment of the present invention; Figure 2 for Figure 1 Another perspective structural diagram; Figure 3 for Figure 1 Another perspective structural diagram; Figure 4 This is a partial cross-sectional view of the housing structure of the present invention; Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point A; Figure 6 This is a schematic diagram of the rotating shaft and clamping structure of the present invention.

[0026] In the diagram: 1 Power mechanism, 2 Support, 3 Rotating shaft, 4 Helical blade, 5 Tube body, 6 Housing, 601 Conical housing, 602 Tubular housing, 7 Limit pin, 8 Mounting seat, 9 Drive mechanism, 10 Locking hole, 11 Guide frame, 12 Base, 13 Hook, 14 Connecting rope, 15 Blocking component, 16 Slot, 17 Fixing component, 18 Clamping component, 19 Reinforcing bar. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] Example 1: Please refer to Figures 1-5This embodiment discloses a mold for precast piles of mixed soil and rock using calcium silicate slag-based cementitious materials, including a rotating shaft 3 and a base 12. The base 12 and the bottom end of a guide frame 11 are fixedly connected. A support 2 and a mounting seat 8 that slide along the length of the guide frame 11 are installed on the guide frame 11. A drive mechanism 9 that drives the support 2 to move along the length of the guide frame 11 is installed on the base 12. The support 2 is located above the mounting seat 8. A housing 6 is fixed on the mounting seat 8. A power mechanism 1 is installed on the support 2. The power output shaft of the power mechanism 1 and the top end of the rotating shaft 3 are connected by a coupling. A spiral blade 4 is installed on the rotating shaft 3. The rotating shaft 3 is installed on the support 2 through a bearing seat.

[0029] The housing 6 includes a conical housing 601, a tubular housing 602, a plug 15, and a fixing member 17. The top and bottom of the conical housing 601 are open. The cross-sectional area of ​​the inner cavity of the conical housing 601 in the horizontal direction gradually decreases from top to bottom. The bottom of the conical housing 601 is connected to the top of the tubular housing 602. A tube 5 is installed in the middle of the inner cavity of the conical housing 601 through a fixing bracket. There is a gap between the bottom of the tube 5 and the inner wall of the conical housing 601.

[0030] The bottom end of the tubular shell 602 contacts the surface of the soil layer. The spiral blade 4 rotates in the forward direction. The bottom end of the spiral blade 4 passes downward through the inner cavity of the tube body 5 and the inner cavity of the tubular shell 602 and enters the soil layer. The spiral blade 4 transports the soil below the tubular shell 602 into the conical shell 601. Silica-calcium slag-based cementitious material is added into the conical shell 601. The silica-calcium slag-based cementitious material and soil in the conical shell 601 are mixed to obtain a mixture.

[0031] The spiral blade 4 moves upward and away from the soil layer, and the bottom end of the spiral blade 4 is located inside the tubular shell 602. The plug 15 is installed at the bottom end of the tubular shell 602 by the fixing member 17. The spiral blade 4 rotates in the opposite direction, and the compacted mixture inside the tubular shell 602 pushes open or breaks the plug 15.

[0032] Furthermore, the vertical distance between the bottom end of the tube 5 and the inner wall of the conical shell 601 is greater than 2.0 cm.

[0033] Furthermore, when the helical blade 4 rotates in the forward direction, it transports the soil from the soil layer into the conical shell 601 and leaves a borehole in the soil layer; when the helical blade 4 rotates in the reverse direction, it transports the soil from the conical shell 601 into the tubular shell 602.

[0034] Furthermore, the outer diameter of the helical blade 4 is equal to the inner diameter of the tube body 5 and the inner diameter of the tubular shell 602.

[0035] Furthermore, reinforcing ribs are fixed to the outer periphery of both the conical shell 601 and the tubular shell 602, which increase the structural strength of the conical shell 601 and the tubular shell 602.

[0036] Furthermore, the drive mechanism 9 is a hydraulic cylinder or an electric push rod, and the power mechanism 1 is an electric motor or a hydraulic motor. The power mechanism 1 and drive mechanism 9 used in this invention are common power components in the prior art, and their working methods and structures are well-known technologies, so they will not be described in detail here.

[0037] Furthermore, the base 12 is mounted on an external towing vehicle, or the base 12 is equipped with wheels.

[0038] The working process and principle of this embodiment are as follows: The worker brings the bottom end of the tubular shell 602 into contact with the surface of the soil layer. The worker drives the power mechanism 1 to rotate the spiral blade 4 in the forward direction through the rotating shaft 3. The worker drives the drive mechanism 9 to move the spiral blade 4 downward through the support 2 and the rotating shaft 3. The bottom end of the spiral blade 4 passes through the inner cavity of the pipe body 5 and the inner cavity of the tubular shell 602 and enters the soil layer. The rotating spiral blade 4 transports the soil below the tubular shell 602 into the conical shell 601 and leaves a borehole in the soil layer. The worker adds a calcium silicate slag-based cementitious material into the conical shell 601. The calcium silicate slag-based cementitious material and soil at the bottom of the inner cavity of the conical shell 601 are continuously carried by the spiral blade 4 through the inner cavity of the pipe body 5 to the upper part of the inner cavity of the conical shell 601. The calcium silicate slag-based cementitious material and soil in the conical shell 601 are fully mixed to obtain a mixture.

[0039] The staff uses the drive mechanism 9 to drive the spiral blade 4 upward through the support 2 and the rotating shaft 3. The spiral blade 4 leaves the soil layer and the bottom end of the spiral blade 4 is located inside the tubular shell 602.

[0040] The worker installs the blocking component 15 at the bottom end of the tubular shell 602 via the fixing component 17. The blocking component 15 covers the bottom end of the tubular shell 602. The worker causes the power mechanism 1 to drive the spiral blade 4 to rotate in the opposite direction via the rotating shaft 3. The spiral blade 4 brings the mixture in the conical shell 601 to the bottom of the inner cavity of the tubular shell 602. The rotating spiral blade 4 compacts the mixture at the bottom of the inner cavity of the tubular shell 602. The rotating spiral blade 4 causes the compacted mixture in the tubular shell 602 to push open or break the blocking component 15. The friction between the compacted mixture in the tubular shell 602 and the inner wall of the tubular shell 602 causes the mixture in the tubular shell 602 to continue to be compacted, thus realizing the production of precast piles.

[0041] This precast pile mold for mixed soil and rock using calcium silicate slag-based cementitious material achieves in-situ production of precast piles through a three-step method of soil sampling, mixing, and compaction. The soil and calcium silicate slag-based cementitious material are mixed evenly, allowing for precise control of the ratio of cementitious material, water, and soil. This eliminates the strength dispersion problem caused by stratum changes, uneven grouting, and unstable mixing blade speed in spiral mixing piles. Furthermore, the compacted mixture removes excess air, reducing the porosity of the precast pile, resulting in precast piles with high strength, low permeability, and good durability.

[0042] The precast pile mold made of calcium silicate slag-based cementitious material for mixed soil and rock has minimal compression deformation of the surrounding soil during operation, preventing ground heave and minimizing impact on adjacent buildings and underground pipelines. While ensuring the strength of the precast pile, the calcium silicate slag-based cementitious material is thoroughly mixed with the soil, reducing the amount of cementitious material used and avoiding waste. Due to the small dispersion in the strength of the precast pile, fewer piles are needed to achieve the same total bearing capacity, saving energy consumption in mechanical construction.

[0043] Compared to spiral mixing piles, the mold for precast piles using calcium silicate slag-based cementitious materials in mixed soil and rock requires less energy to overcome soil shear resistance during the mixing process.

[0044] This silicon-calcium slag-based cementitious material mold for mixed soil and rock precast piles reduces cement consumption during the precast pile production process and utilizes the silicon-calcium slag-based cementitious material as the raw material for precast piles, thus realizing the utilization of solid waste.

[0045] Preferably, after the spiral blade 4 leaves the soil layer and the bottom end of the spiral blade 4 is inside the tubular shell 602, the staff will simultaneously raise the height of the support 2 and the mounting base 8 to facilitate the staff to move and store the precast piles extruded from the tubular shell 602 for curing. The staff will then insert the cured precast piles into the borehole; or the precast piles that come out of the tubular shell 602 will enter the borehole.

[0046] Furthermore, the staff causes the drive mechanism 9 to move the spiral blade 4 downward through the support 2 and the rotating shaft 3. The spiral blade 4 causes the compacted mixture inside the tubular shell 602 to move downward, so that the precast pile is completely separated from the tubular shell 602.

[0047] Furthermore, the length of the precast piles is 0.5m-2.5m.

[0048] Furthermore, the soil moisture content inside the conical shell 601 is 35%-60%. When the soil moisture content is below 35%, the staff replenishes the soil moisture by spraying.

[0049] Furthermore, when the helical blade 4 leaves the soil layer and the bottom end of the helical blade 4 is located inside the tubular shell 602, the workers adjust the distance between the bottom end of the helical blade 4 and the bottom end of the tubular shell 602 to adjust the hardness of the precast pile: under the premise that the bottom end of the helical blade 4 is inside the tubular shell 602, the greater the distance between the bottom end of the helical blade 4 and the bottom end of the tubular shell 602, the greater the hardness of the precast pile.

[0050] Example 2: Figures 3-5 As shown, this embodiment discloses a mold for precast piles of mixed soil and rock using calcium silicate slag-based cementitious materials. Its structure is roughly the same as that of Embodiment 1. The difference is that in this embodiment, the blocking component 15 is a circular metal plate or a circular plastic plate, the top side of the fixing component 17 is provided with a groove, the middle position of the bottom side of the groove is provided with a through hole, the edge of the bottom side of the blocking component 15 is in contact with the edge of the bottom side of the groove, and the groove of the fixing component 17 and the bottom end of the tubular shell 602 are detachably connected.

[0051] Furthermore, the inner wall of the groove is threaded to the bottom of the outer periphery of the tubular housing 602, and the edge of the bottom side of the groove and the bottom end of the tubular housing 602 clamp the edge of the plug 15; or the inner wall of the groove and the bottom of the outer periphery of the tubular housing 602 are interference-fitted, the edge of the plug 15 is provided with a protruding ring, and the bottom side of the groove is provided with an annular groove that matches the protruding ring.

[0052] The plug 15 is easy to install at the bottom of the tubular housing 602.

[0053] Example 3: Figure 4 and Figure 5 As shown, this embodiment discloses a mold for precast piles in mixed soil and rock using calcium silicate slag-based cementitious materials. Its structure is roughly the same as that of Embodiment 2. The difference is that the middle part of the top side of the plugging member 15 in this embodiment is recessed downwards, so that the precast pile extruded from the tubular shell 602 forms a pile tip, which facilitates the insertion of the precast pile into the soil or borehole. Example

[0054] like Figure 3 As shown, this embodiment discloses a mold for precast piles of mixed soil and rock using calcium silicate slag-based cementitious material. Its structure is roughly the same as that of Embodiment 3. The difference is that in this embodiment, the top or bottom side of the blocking member 15 is provided with a number of slots 16 passing through the middle position of the blocking member 15.

[0055] The working process and principle of this embodiment are as follows: During the process of the compacted mixture inside the tubular shell 602 breaking through the plug 15, the plug 15 cracks along the slot 16, and the compacted mixture inside the tubular shell 602 leaves the tubular shell 602 through the crack in the plug 15.

[0056] Example 5: Figure 6 As shown, this embodiment discloses a mold for precast piles of mixed soil and rock using calcium silicate slag-based cementitious materials. Based on any of the embodiments from Embodiment 1 to Embodiment 4, the bottom end of the rotating shaft 3 in this embodiment is provided with a long groove, and a detachable clamp 18 is installed at the bottom end of the long groove.

[0057] Among them, the plug 15 is installed before the bottom end of the tubular shell 602 by the fixing member 17, the clamp 18 at the bottom end of the long groove is removed, and the steel bar 19 is inserted into the long groove.

[0058] The working process and principle of this embodiment are as follows: During the compaction process, steel bars 19 are added to the mixture inside the tubular shell 602 to enhance the strength of the precast pile.

[0059] Example 6: Figure 6 As shown, this embodiment discloses a mold for precast piles of mixed soil and rock using calcium silicate slag-based cementitious materials. Its structure is roughly the same as that of Embodiment 1. The difference is that the top and / or bottom sides of the spiral blade 4 are provided with several spiral components, which are fiber filaments, iron wires or steel bars. One end of the spiral component is snapped or bonded to the bottom end of the spiral blade 4.

[0060] After the helical blade 4 leaves the soil layer and the bottom end of the helical blade 4 is located inside the tubular shell 602, the bottom end of the helical blade 4 and the end of the helical component separate, and the helical component enters the compacted mixture inside the tubular shell 602 to improve the strength of the precast pile.

[0061] Preferably, there are no fewer than three spiral components, which are fixed on several support rods, and the support rods are arranged radially along the spiral blades 4, so that the spiral components are evenly distributed in the precast pile.

[0062] Example 7: Figures 1-3 As shown, this embodiment discloses a mold for precast piles of mixed soil and rock using calcium silicate slag-based cementitious material. Its structure is roughly the same as that of Embodiment 1. The difference is that in this embodiment, the guide frame 11 has several holes 10 along the vertical direction, and at least one hole 10 has a limiting pin 7.

[0063] The working process and principle of this embodiment are as follows: The operator slides the mounting base 8 along the length of the guide frame 11, and then inserts the limit pin 7 into the nearest locking hole 10 below the mounting base 8 to adjust the height of the housing 6.

[0064] Example 8: As Figure 1 and Figure 2As shown, this embodiment discloses a mold for precast piles of mixed soil and rock using calcium silicate slag-based cementitious materials. Its structure is roughly the same as that of Embodiment 7. The difference is that in this embodiment, one end of the support 2 and the connecting rope 14 are fixedly connected, and the other end of the connecting rope 14 is equipped with a hook 13.

[0065] The working process and principle of this embodiment are as follows: The operator hooks the hook 13 onto the mounting base 8, and then drives the drive mechanism 9 to slide the mounting base 8 along the length of the guide frame 11 via the support 2, connecting rope 14, and hook 13. Finally, the operator inserts the limit pin 7 into the nearest locking hole 10 below the mounting base 8 to adjust the height of the housing 6.

[0066] Example 9: This example discloses a method for using a mold for precast piles made of calcium silicate slag-based cementitious materials in mixed soil and rock. Applied to the molds for precast piles made of calcium silicate slag-based cementitious materials in any of Examples 1 to 8, the method includes the following steps: The bottom end of the tubular shell 602 contacts the surface of the soil layer. The power mechanism 1 drives the spiral blade 4 to rotate in the forward direction through the rotating shaft 3. The drive mechanism 9 drives the spiral blade 4 to move downward through the support 2 and the rotating shaft 3. The bottom end of the spiral blade 4 passes through the inner cavity of the pipe body 5 and the inner cavity of the tubular shell 602 and enters the soil layer. The spiral blade 4 transports the soil below the tubular shell 602 into the conical shell 601. Silica-calcium slag-based cementitious material is added into the conical shell 601. The silica-calcium slag-based cementitious material and soil in the conical shell 601 are mixed to obtain a mixture.

[0067] The drive mechanism 9 drives the spiral blade 4 to move upward through the support 2 and the rotating shaft 3. The spiral blade 4 leaves the soil layer, and the bottom end of the spiral blade 4 is located inside the tubular shell 602.

[0068] The blocking component 15 is installed at the bottom of the tubular shell 602 via the fixing component 17. The power mechanism 1 drives the spiral blade 4 to rotate in the opposite direction via the rotating shaft 3. The mixture inside the tubular shell 602 is compacted at the bottom of the inner cavity of the tubular shell 602. The compacted mixture inside the tubular shell 602 pushes open or breaks the blocking component 15. The friction between the compacted mixture inside the tubular shell 602 and the inner wall of the tubular shell 602 causes the mixture inside the tubular shell 602 to continue to be compacted, thereby realizing the production of precast piles.

[0069] This method of using molds for precast piles made of calcium silicate slag-based cementitious materials in mixed soil and rock allows for on-demand soil extraction, quantitative mixing, and precise insertion into boreholes after precast pile curing. This improves the utilization rate of calcium silicate slag-based cementitious materials, eliminates the need for a pumping system, and features high equipment integration, facilitating continuous construction by workers.

[0070] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A mold for precast piles in mixed soil and rock using a silica-calcium slag-based cementitious material, characterized in that: Includes a rotating shaft (3) and a base (12). The base (12) and the bottom end of the guide frame (11) are fixedly connected. A sliding support (2) and a mounting seat (8) are installed on the guide frame (11). A drive mechanism (9) that drives the support (2) to move is installed on the base (12). A housing (6) is fixed on the mounting seat (8). A power mechanism (1) that drives the rotating shaft (3) to rotate is installed on the support (2). A spiral blade (4) is installed on the rotating shaft (3). The housing (6) includes a conical housing (601), a tubular housing (602), a plug (15), and a fixing member (17). The cross-sectional area of ​​the inner cavity of the conical housing (601) gradually decreases from top to bottom. The bottom end of the conical housing (601) is connected to the top end of the tubular housing (602). A tube (5) is installed in the middle of the inner cavity of the conical housing (601). A gap is provided between the bottom end of the tube (5) and the inner wall of the conical housing (601). The bottom end of the tubular shell (602) is in contact with the surface of the soil layer. The spiral blade (4) rotates in the forward direction. The bottom end of the spiral blade (4) passes downward through the inner cavity of the tube (5) and the inner cavity of the tubular shell (602) and enters the soil layer. The spiral blade (4) transports the soil below the tubular shell (602) into the conical shell (601). Calcium silicate slag-based cementitious material is added into the conical shell (601). The calcium silicate slag-based cementitious material in the conical shell (601) is mixed with the soil to obtain a mixture. In this process, the spiral blade (4) moves upward and leaves the soil layer, and the bottom end of the spiral blade (4) is located inside the tubular shell (602). The plug (15) is installed at the bottom end of the tubular shell (602) by the fixing member (17). The spiral blade (4) rotates in the opposite direction, and the compacted mixture inside the tubular shell (602) pushes open or breaks the plug (15).

2. The mold for precast piles in mixed soil and rock using silicon-calcium slag-based cementitious materials according to claim 1, characterized in that: The blocking component (15) is a metal plate or a plastic plate. The top side of the fixing component (17) has a groove, and the middle position of the bottom side of the groove has a through hole. The edge of the bottom side of the blocking component (15) is in contact with the edge of the bottom side of the groove. The groove of the fixing component (17) and the bottom end of the tubular shell (602) are detachably connected.

3. The mold for precast piles in mixed soil and rock using silicon-calcium slag-based cementitious materials according to claim 2, characterized in that: The middle part of the top side of the plug (15) is recessed downward.

4. The mold for precast piles in mixed soil and rock as described in claim 3, characterized in that: The top or bottom side of the blocking member (15) is provided with a number of slots (16) passing through the middle position of the blocking member (15).

5. The mold for precast piles in mixed soil and rock as described in claim 4, characterized in that: The bottom end of the rotating shaft (3) is provided with a long groove, and a detachable clip (18) is installed at the bottom end of the long groove. Before the plug (15) is installed at the bottom of the tubular shell (602) by the fixing member (17), the clamp (18) at the bottom of the long groove is removed, and the reinforcing bar (19) is inserted into the long groove.

6. The mold for precast piles in mixed soil and rock as described in claim 1, characterized in that: The vertical distance between the bottom end of the tube (5) and the inner wall of the conical shell (601) is greater than 2.0 cm.

7. The mold for precast piles in mixed soil and rock as described in claim 1, characterized in that: The guide frame (11) has several holes (10) along the vertical direction, and at least one hole (10) has a limiting pin (7).

8. The mold for precast piles in mixed soil and rock as described in claim 7, characterized in that: The support (2) is fixedly connected to one end of the connecting rope (14), and the other end of the connecting rope (14) is equipped with a hook (13).

9. The mold for precast piles in mixed soil and rock as described in claim 1, characterized in that: Reinforcing ribs are fixed to the outer periphery of both the conical shell (601) and the tubular shell (602).

10. A method for using a mold for precast piles made of silica-calcium slag-based cementitious materials in mixed soil and rock, applied to the mold for precast piles made of silica-calcium slag-based cementitious materials in mixed soil and rock as described in any one of claims 1-9, characterized in that... Includes the following steps: The bottom end of the tubular shell (602) is in contact with the surface of the soil layer. The power mechanism (1) drives the spiral blade (4) to rotate in the forward direction through the rotating shaft (3). The drive mechanism (9) drives the spiral blade (4) to move downward through the support (2) and the rotating shaft (3). The bottom end of the spiral blade (4) passes downward through the inner cavity of the tube body (5) and the inner cavity of the tubular shell (602) and enters the soil layer. The spiral blade (4) transports the soil below the tubular shell (602) into the conical shell (601). Calcium silicate slag-based cementitious material is added into the conical shell (601). The calcium silicate slag-based cementitious material and the soil in the conical shell (601) are mixed to obtain a mixture. The drive mechanism (9) drives the spiral blade (4) to move upward through the support (2) and the rotating shaft (3), the spiral blade (4) leaves the soil layer, and the bottom end of the spiral blade (4) is located inside the tubular shell (602); The blocking component (15) is installed at the bottom of the tubular shell (602) by the fixing component (17). The power mechanism (1) drives the spiral blade (4) to rotate in the opposite direction through the rotating shaft (3). The mixture in the tubular shell (602) is compacted at the bottom of the inner cavity of the tubular shell (602). The compacted mixture in the tubular shell (602) pushes open or breaks the blocking component (15).

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