A device and method for secondary utilization of super-poured concrete of a cast-in-place pile

Abstract

The application belongs to the technical field of concrete pile construction, and particularly discloses a secondary utilization device and method for super-poured concrete of a cast-in-place pile. The secondary utilization device for the super-poured concrete of the cast-in-place pile comprises an upper pile cutting jig and a lower pile cutting jig. The upper pile cutting jig is arranged on the lower pile cutting jig. The secondary utilization device can lift the super-poured concrete in the pile out of the pile in the initial setting stage, and then the super-poured concrete can be utilized in a diversified way. The height of the pile cutting head is greatly reduced, the pile head steel is protected from damage, the artificial ring cutting process is avoided, the pile cutting head time is saved, the pile cutting head efficiency is improved, the noise and dust pollution are reduced, and the source control of the super-poured concrete resources is realized.

Description

Technical Field

[0001] This invention belongs to the field of concrete pile construction technology, specifically relating to a device and method for the secondary utilization of over-poured concrete in cast-in-place piles. Background Technology

[0002] Concrete piles are an essential part of the foundation work for many buildings. However, current construction techniques for concrete piles have the following shortcomings: I. Problems of Concrete Waste. Clause 6.3.30 of the "Technical Specification for Building Pile Foundations" (JGJ94-2008) stipulates the requirements for over-pouring height: the over-pouring height of the final pour should be controlled within the range of 0.8-1m to ensure the quality of the pile top concrete, effectively remove the laitance layer, and ensure that the pile head strength meets design requirements. In traditional concrete pile construction processes, the over-pouring portion of concrete needs to be removed 7-14 days after final setting. For concrete with an over-pouring height of 0.8-1m, because it cannot be reused in its initial setting stage, this portion of resources is directly discarded, resulting in resource waste.

[0003] Second, there is the problem of inconvenience in cutting off pile heads. During the construction of cast-in-place piles, after the concrete is injected into the pile hole, it carries mud and sediment from the bottom back up. Before the end of the pouring, the top of the pile will be mixed with mud and sediment, forming a concrete layer with low strength and unstable quality. This is called the "slurry layer" or "inferior section". If this part is not removed and the pile head is directly connected to the pile cap or foundation beam, it may lead to insufficient strength at the top of the pile. Therefore, in order to ensure the strength of the entire pile, the top section of the cast-in-place concrete pile needs to be cut off. Traditionally, pile head cutting is mainly done manually. Workers drill pile holes around the cutting point based on experience. When drilling the pile holes, the force direction on the pile head is uneven, which has a significant impact on the reinforcing steel of the pile head and the lower pile body. At the same time, the pile cutting speed is slow. Although there are pile head cutting machines on the market, they are expensive, cause greater damage to the reinforcing steel of the pile head, and may even break the reinforcing steel, resulting in a lot of repairs later and affecting the quality of the pile body. In addition, the traditional circumferential cutting process for pile heads is time-consuming and labor-intensive. The circumferential cutting process generates a lot of noise and dust, and workers inhale a lot of dust, making them prone to occupational diseases such as pneumoconiosis. Summary of the Invention

[0004] The present invention aims to provide a device and method for the secondary utilization of over-poured concrete in cast-in-place piles, so as to realize the recycling of over-poured concrete during the pouring process and avoid concrete waste.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A device for the secondary utilization of over-poured concrete in cast-in-place piles is provided, comprising an upper pile-cutting cauldron and a lower pile-cutting cauldron. The upper pile-cutting cauldron includes a first outer sleeve, a first inner sleeve at the upper part of the first outer sleeve, and a first conical cylinder at the lower part of the first outer sleeve. The first inner sleeve is fixed to the top of the first conical cylinder, and the first conical cylinder is fixed to the bottom of the first outer sleeve. The first conical cylinder communicates with the first inner sleeve. The first outer sleeve, the first conical cylinder, and the outer side of the first inner sleeve form a first over-poured concrete receiving cavity. The lower pile cauldron includes a second outer sleeve, a second inner sleeve in the upper part of the second outer sleeve, and a second conical cylinder in the lower part of the second outer sleeve. The second inner sleeve is fixed to the top of the second conical cylinder, and the second conical cylinder is fixed to the bottom of the second outer sleeve. The second conical cylinder communicates with the second inner sleeve. The second outer sleeve, the second conical cylinder, and the outer side of the second inner sleeve form a second overfilled concrete receiving cavity. The upper pile cauldron is mounted on the lower pile cauldron, thereby connecting the first inner sleeve and the second inner sleeve.

[0006] Preferably, it also includes a circumferential rubber strip for placement on the outside of the reinforcing cage, used at the concrete protective layer of the pile. After peeling off the rubber strip, a circumferential groove is formed to eliminate the need for manual circumferential cutting.

[0007] Preferably, a plurality of hollow pre-embedded pipes are provided circumferentially through the lower part of the rubber strip, and a portion of the hollow pre-embedded pipes extends into the interior of the rubber strip to form a broken pile hole in the concrete pile.

[0008] Preferably, a guide mechanism is provided between the upper and lower pile cauldrons.

[0009] Preferably, the guiding mechanism includes a guide rod disposed on the outer wall of the second outer sleeve and a guide bolt disposed on the outer wall of the first outer sleeve, and the guide rod is provided with a guide groove corresponding to the guide bolt.

[0010] Preferably, the first outer sleeve of the upper pile cauldron is fitted inside the second outer sleeve of the lower pile cauldron, and the two overlap at the second outer sleeve; a lifting position is provided on the first outer sleeve.

[0011] Preferably, a stepped surface is provided at the junction of the first inner sleeve and the first conical cylinder, and the top of the second inner sleeve is supported under the stepped surface.

[0012] This invention also provides a method for the secondary utilization of over-poured concrete in cast-in-place piles. This method employs the aforementioned device for the secondary utilization of over-poured concrete in cast-in-place piles, comprising: Measure and mark the location of the pile hole, position the drilling rig, drill to form the pile hole, inspect the completed hole and measure the pile top elevation; Fabricate a reinforcing cage, mark the measured pile top elevation on the reinforcing cage, clean the hole, and hoist the reinforcing cage into the pile hole; At a position a certain distance above the pile top elevation marked on the reinforcing cage, the rubber strip is pre-embedded. The rubber strip is sleeved on the outside of the reinforcing cage, and multiple hollow pre-embedded pipes are circumferentially inserted through the lower part of the rubber strip. The upper and lower pile cauldrons are pre-embedded and placed inside the steel cage. The bottom of the lower pile cauldron is supported on the annular inner reinforcement of the steel cage. During the installation of the upper and lower pile cauldrons, the guide mechanism aligns the upper and lower pile cauldrons. Once the upper pile cauldron is in place, the top of the second inner sleeve of the lower pile cauldron is supported under the stepped surface of the upper pile cauldron. The top of the upper pile cauldron is supported to prevent the reinforcing cage, the embedded rubber strip, and the upper and lower pile cauldrons from floating during the process of pouring concrete into the pile hole. A guide tube is placed downwards from the first inner sleeve of the upper pile cauldron and the second inner sleeve of the lower pile cauldron, and then the pile hole is cleaned a second time. Concrete is poured into the pile hole from bottom to top through a guide pipe. The concrete gradually fills the pile hole from bottom to top until it reaches the bottom of the lower section pile cauldron. The amount of concrete to be poured over is estimated, and then the pile hole is over-poured. After the over-pour amount is reached, the concrete pouring is stopped, and the concrete pouring is completed. During the over-pouring process, the over-pouring concrete flows upward along the second inner sleeve and the first inner sleeve into the first over-pouring concrete receiving cavity of the upper pile cauldron; if the over-pouring process ends and the guide tube is pulled out, and the first over-pouring concrete receiving cavity is full, then the upper pile cauldron is lifted first, and the upper pile cauldron slides upward along the guide mechanism. During the separation process from the lower pile cauldron, the over-pouring concrete flows downward along the first inner sleeve into the second over-pouring concrete receiving cavity of the lower pile cauldron. The upper and lower pile cauldrons are lifted out, and the concrete in them is reused in various ways, such as to make concrete bricks, drainage ditches, cover plates, curb stones or cast-in-place foundation pads. After curing the poured concrete pile for 7-14 days, the soil around the top of the pile is excavated to expose the pile head. At the top of the pile, after peeling off the rubber strip in the concrete protective layer, a circumferential groove is formed in the concrete protective layer, eliminating the need for manual circumferential cutting. Multiple steel rods are inserted along the pre-reserved broken pile holes of each hollow pre-embedded pipe, and horizontal force is applied alternately by manual or mechanical means to form a regular horizontal crack along the circumference of the pile top, thereby completing the operation of cutting the pile head. The severed pile head was lifted out, and the top of the pile was manually repaired.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The secondary utilization device for over-filled concrete in cast-in-place piles includes an upper pile-cutting cauldron and a lower pile-cutting cauldron, with the upper pile-cutting cauldron set on the lower pile-cutting cauldron. This secondary utilization device for over-filled concrete in cast-in-place piles can make secondary and diversified uses of the over-filled concrete in the pile. Since a large amount of concrete is lifted out of the pile hole, the height of the pile head is significantly reduced, protecting the pile head reinforcement from damage, avoiding the manual circumferential cutting process, saving pile head cutting time, improving pile head cutting efficiency, and reducing noise and dust pollution. It achieves the goal of source control, turning waste into treasure, and comprehensive utilization of over-filled concrete resources. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a front view of an embodiment of the device for the secondary utilization of over-poured concrete in cast-in-place piles according to the present invention.

[0015] Figure 2 This is a three-dimensional structural diagram of the upper and lower pile cauldrons in one embodiment of the secondary utilization device for over-poured concrete in cast-in-place piles according to the present invention.

[0016] Figure 3 This is a schematic diagram of the internal structure of an embodiment of the device for the secondary utilization of over-poured concrete in cast-in-place piles according to the present invention.

[0017] Figure 4 This is a schematic diagram of the internal structure of the upper section pile cauldron in one embodiment of the secondary utilization device for over-poured concrete in cast-in-place piles according to the present invention.

[0018] Figure 5 This is a schematic diagram of the internal structure of the lower pile-cutting cauldron in one embodiment of the secondary utilization device for over-poured concrete in cast-in-place piles according to the present invention.

[0019] Figure 6 This is a construction schematic diagram of an embodiment of the method for secondary utilization of over-poured concrete in cast-in-place piles according to the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In one embodiment, a device for the secondary utilization of over-poured concrete in cast-in-place piles is provided, such as... Figure 1-3As shown, the secondary utilization device for over-poured concrete in cast-in-place piles includes an upper pile cauldron 10 and a lower pile cauldron 20. The upper pile cauldron 10 and the lower pile cauldron 20 cooperate with each other and are used to install on the top of the pile hole. When pouring concrete piles, the over-poured concrete is removed and reused to avoid concrete waste.

[0022] like Figure 4 As shown, the upper pile cauldron 10 includes a first outer sleeve 11, a first inner sleeve 12 is provided in the upper part of the first outer sleeve 11, a conduit for grouting concrete is placed in the first inner sleeve 12, and a first conical cylinder 13 is provided in the lower part of the first outer sleeve 11. The first inner sleeve 12 is fixed to the top of the first conical cylinder 13, and the first conical cylinder 13 is fixed to the bottom of the first outer sleeve 11. The first conical cylinder 13 is connected to the first inner sleeve 12. Here, the first outer sleeve 11, the first inner sleeve 12 and the first conical cylinder 13 are all steel cylinders. The bottom of the first conical cylinder 13 is welded to the inside of the first outer sleeve 11, and the bottom of the first inner sleeve 12 is welded to the top of the first conical cylinder. The inside of the first outer sleeve 11 and the outside of the first conical cylinder 13 and the first inner sleeve 12 form a first over-grouting concrete receiving cavity 14.

[0023] like Figure 5 As shown, the lower pile cauldron 20 includes a second outer sleeve 21, and a second inner sleeve 22 is provided in the upper part of the second outer sleeve 21. The second inner sleeve 22 is also used to put in the conduit for pouring concrete. A second conical cylinder 23 is provided in the lower part of the second outer sleeve 21. The second inner sleeve 22 is fixed to the top of the second conical cylinder 23, and the second conical cylinder 23 is fixed to the bottom of the second outer sleeve 21. The second conical cylinder 23 is connected to the second inner sleeve 22. Similarly, the second outer sleeve 21, the second inner sleeve 22, and the second conical cylinder 23 are all steel cylinders. The bottom of the second conical cylinder 23 is welded to the inside of the second outer sleeve 21, and the bottom of the second inner sleeve 22 is welded to the top of the second conical cylinder 23. The inside of the second outer sleeve 21 and the outside of the second conical cylinder 23 and the second inner sleeve 22 form a second over-poured concrete receiving cavity 24.

[0024] like Figure 1-3As shown, the upper pile cauldron 10 is mounted on the lower pile cauldron 20, connecting the first inner sleeve 12 and the second inner sleeve 22 to facilitate the downward placement of the concrete pouring conduit. In use, this secondary utilization device for overfilled concrete in cast-in-place piles has the upper pile cauldron 10 and the lower pile cauldron 20 positioned inside the reinforcing cage at the top of the pile hole. When the pile hole is filled with concrete, any overfilling will cause the concrete at the top of the pile hole to flow upwards along the second inner sleeve 22 and the first inner sleeve 12 into the first overfilled concrete receiving cavity 14 of the upper pile cauldron 10. If the over-pouring process is completed and the conduit is pulled out, the first over-pouring concrete receiving cavity 14 is now full of concrete. The upper pile cauldron 10 can then be lifted up, allowing it to slide upwards along the guide mechanism 30. During the separation of the upper pile cauldron 10 and the lower pile cauldron 20, the over-pouring concrete flows downwards along the first inner sleeve 12 into the second over-pouring concrete receiving cavity 24 of the lower pile cauldron 20, until the upper pile cauldron 10 and the lower pile cauldron 20 are lifted out of the pile.

[0025] Furthermore, such as Figure 1-3 As shown, the secondary utilization device for over-poured concrete in the cast-in-place pile has a guiding mechanism 30 between the upper pile cauldron 10 and the lower pile cauldron 20. The guiding mechanism 30 is used to guide the upper pile cauldron 10 when it is stacked on the lower pile cauldron 20, so as to prevent the upper pile cauldron 10 and the lower pile cauldron 20 from being misaligned.

[0026] Combination Figure 2-3 As shown, the guiding mechanism 30 includes guide rods 31 disposed on the outer wall of the second outer sleeve 21 and guide bolts 32 disposed on the outer wall of the first outer sleeve 11. There are three guide rods 31 and three guide bolts 32 respectively. Each guide rod 31 is provided with a guide groove 311 corresponding to the guide bolt 32. The top of the guide groove 311 is sealed to prevent the guide bolt 32 from disengaging from the guide groove 311 when it moves upward. When the upper pile ding 10 is stacked on the lower pile ding 20, the guide bolt 32 moves along the guide groove 311 to play a guiding role.

[0027] Under the action of guide rod 31 and guide bolt 32, the upper pile cauldron 10 and the lower pile cauldron 20 can only move up and down along the guide mechanism 30. The upper pile cauldron 10 will not detach from the lower pile cauldron 20. After the upper pile cauldron 10 is lifted, it will move to the top along the guide mechanism 30 and then lift the lower pile cauldron 20 through the guide bolt 32 and guide rod 31.

[0028] In addition, combined Figure 6 As shown, the secondary utilization device for over-poured concrete in the cast-in-place pile also includes a circumferential rubber strip 40 for setting on the outer side of the top of the reinforcing cage 60. The rubber strip 40 is used to form a circumferential groove on the outer circumferential surface of the concrete protective layer 51 and the top of the pile, eliminating the need for manual circumferential cutting and facilitating pile cutting.

[0029] Furthermore, in combination Figure 6 As shown, the secondary utilization device for over-poured concrete in the cast-in-place pile has multiple hollow pre-embedded pipes 41 circumferentially inserted at the lower part of the rubber belt 40. A portion of the hollow pre-embedded pipes 41 extends into the interior of the rubber belt 40 to form radial break holes in the concrete pile, which facilitates the later cutting of the pile head.

[0030] In addition, such as Figure 4 As shown, a stepped surface 15 is provided at the joint between the first inner sleeve 12 and the first conical cylinder 13, such as... Figure 3-5 As shown, after the first outer sleeve 11 of the upper pile cauldron 10 is fitted onto the second conical cylinder 23 of the lower pile top 20, the top of the second inner sleeve 22 is supported under the step surface 15.

[0031] In addition, a lifting position can be provided on the top of the first outer sleeve 11 for connecting the hook during lifting. In this embodiment, the lifting position is provided on the top of the first outer sleeve 11 and connected to the hook of the lifting device.

[0032] Based on the above embodiments, it can be seen that the secondary utilization device for over-filled concrete in cast-in-place piles can make secondary and diversified use of the over-filled concrete in the pile, significantly reduce the height of the pile head, protect the pile head reinforcement from damage, avoid the manual circumferential cutting process, save pile head cutting time, improve pile head cutting efficiency, and reduce noise and dust pollution, thereby achieving the goals of resource source control, turning waste into treasure, and comprehensive utilization.

[0033] The upper and lower pile-cutting cauldrons can collect the excess concrete at the top of the pile. The collected, initially set concrete is then lifted out of the pile by the pile-cutting cauldron for reuse, reducing the amount of concrete above the pile top and thus lowering the height of the waste portion of the pile head. The concrete lifted out of the pile can be used to make concrete components, such as concrete bricks, drainage ditches and covers, curb stones, or foundation pads.

[0034] A rubber strip is fitted on the outer side of the top of the reinforcing cage, and hollow pre-embedded pipes 41 are set around the bottom of the rubber strip. The hollow pre-embedded pipes 41 can be PVC pipes. Hollow PVC pipes (hollow pre-embedded pipes 41) with a length of 10-15cm are inserted at intervals of 20-30cm along the circumference of the pile top. This allows for the pre-reservation of pile cutting holes for the steel chisels used to cut the pile head in advance (avoiding drilling holes after the concrete has hardened). During the pile cutting process, because a ring of pre-reserved pile cutting holes is reserved, the traditional method of applying pile cutting force during pile cutting is changed. The force can be uniformly applied in the same horizontal direction, which facilitates the rapid cutting of the pile head manually or mechanically (fully utilizing the low tensile strength of concrete, applying horizontal force makes the pile head easier to cut off), thereby reducing the impact on the lower pile body and eliminating the need for manual circumferential cutting of the pile head.

[0035] In one embodiment, a method for the secondary use of over-poured concrete in cast-in-place piles is provided. This method employs the secondary use device for over-poured concrete in cast-in-place piles described in the previous embodiment, combined with... Figure 1-6 As shown, the method includes the following steps: (1) Measure and lay out the location of the pile hole, position the drilling rig, drill to form a pile hole of 50, accept the hole and measure the elevation of the pile top.

[0036] Combination Figure 6 As shown, a concrete protective layer 51 is formed on the inner wall of the pile hole 50 to protect the reinforcing cage 60 from corrosion by the soil 52 on the side wall of the pile hole 50.

[0037] (2) Make a steel cage 60, mark the measured pile top elevation on the steel cage 60, clean the hole and hoist the steel cage 60 into the pile hole 50.

[0038] In this step, the reinforcing cage 60 can be fabricated in sections and then joined together. The measured pile top elevation is marked on the last section of the reinforcing cage. Hole cleaning involves removing the mud and debris from the bottom of the pile hole.

[0039] (3) At a position a distance above the pile top elevation marked on the steel cage 60, a rubber strip 40 is pre-embedded. The rubber strip 40 is sleeved on the outer side of the top of the steel cage 60, and multiple hollow pre-embedded pipes 41 are circumferentially inserted at the bottom of the rubber strip 40.

[0040] The pre-embedded rubber strip 40 is a 5cm thick rubber strip, and the pre-embedded hollow pre-embedded pipe 41 can be a 2cm diameter PVC pipe. The hollow pre-embedded pipe 41 passes through the rubber strip at intervals of 20-30cm, and the depth of the hollow pre-embedded pipe 41 inserted into the rubber strip is 10-15cm.

[0041] (4) Pre-embed the upper pile cauldron 10 and the lower pile cauldron 20, and set the upper pile cauldron 10 and the lower pile cauldron 20 inside the steel cage 60. The bottom of the lower pile cauldron 20 is supported on the annular inner bar 61 at the top of the steel cage 60.

[0042] Under the action of the guide mechanism 30, the upper pile cauldron 10 and the lower pile cauldron 20 are an integrated device that can move up and down along the guide mechanism. The upper pile cauldron 10 moves down along the guide mechanism so that the lower part of the upper pile cauldron 10 is fitted onto the lower pile cauldron 20. During the installation process, the guide mechanism 30 aligns the upper pile cauldron 10 and the lower pile cauldron 20. After the upper pile cauldron 10 is installed in place, the top of the second inner sleeve 22 of the lower pile cauldron 20 is supported under the stepped surface 15 of the upper pile cauldron 10.

[0043] (5) Support the top of the upper pile cauldron 10 to prevent the steel cage 60, the pre-embedded rubber strip 40, the upper pile cauldron 10 and the lower pile cauldron 20 from floating during the process of pouring concrete into the pile hole 50.

[0044] The upper opening of the pile cap 10 can be vertically supported by a bracket made of steel pipes and anchor rods and anchored in the soil 52, thereby preventing the steel cage and pre-embedded devices from floating during the pouring process.

[0045] (6) Place the guide pipe downward from the first inner sleeve 12 of the upper pile cauldron 10 and the second inner sleeve 22 of the lower pile cauldron 20, and then perform secondary cleaning of the pile hole 50.

[0046] (7) Concrete is poured into the pile hole 50 from bottom to top through the guide pipe. The concrete gradually fills the pile hole 50 from bottom to top until it reaches the bottom of the lower pile cauldron 20. The amount of concrete for the over-pouring height is estimated. Then, the pile hole 50 is over-pouring concrete. After the over-pouring amount is reached, the concrete pouring is stopped. The concrete pouring is completed. The upper pile cauldron 10 and the lower pile cauldron 20 are lifted out. During the over-pouring process, the over-pouring concrete flows upward along the first inner sleeve 12 and the second inner sleeve 22 into the first over-pouring concrete receiving cavity 14 of the upper pile cauldron 10. If the over-pouring process ends and the guide pipe is pulled out, the first over-pouring concrete receiving cavity 14 is already full. Then the upper pile cauldron 10 is lifted out first. The upper pile cauldron 10 slides upward along the guide mechanism 30. During the separation of the upper pile cauldron 10 and the lower pile cauldron 20, the over-pouring concrete flows downward along the first inner sleeve 12 into the second over-pouring concrete receiving cavity 24 of the lower pile cauldron 20.

[0047] According to regulations, the amount of concrete needed to overfill the pile height is estimated to be 0.8-1m. The concrete volume can be accurately estimated using the rope and hammer ball method (the height between the ground surface and the actual concrete surface, the height between the ground surface and the bottom of the first conical cylinder 13, the height difference between the two plus the height of the upper pile cauldron 10, to obtain an accurate estimated height), thereby controlling the amount of concrete used.

[0048] (8) Lift out the upper pile cauldron 10 and the lower pile cauldron 20, and reuse the concrete in the upper pile cauldron 10 and the lower pile cauldron 20 for secondary diversification, such as making concrete bricks, drainage ditches, cover plates, curb stones or cast-in-place foundation pads.

[0049] (9) After curing the poured concrete pile for 7-14 days, excavate the soil around the top of the pile to expose the pile head. At the top of the pile, peel off the rubber strip 40 in the concrete pile protective layer 51 to form a circumferential groove in the concrete pile protective layer 51, thus eliminating the need for manual circumferential cutting.

[0050] (10) Insert multiple steel rods along the pre-reserved pile holes of each hollow pre-embedded pipe 41, and apply horizontal force manually or mechanically at intervals to form a regular horizontal crack along the perimeter of the pile top, thereby completing the operation of cutting the pile head.

[0051] (11) Lift out the cut-off pile head and manually repair the pile top.

[0052] Based on the above embodiments, it can be seen that the secondary utilization method of the over-poured concrete in the cast-in-place pile can use a secondary utilization device for the over-poured concrete in the cast-in-place pile to be pre-embedded at the pile top. The over-poured concrete at the pile top can be lifted out of the pile for secondary utilization during its initial setting stage, until the various steps of cutting the pile head are completed. This method realizes the recycling of concrete resources, avoids the manual ring cutting process, reduces the height of the pile head, and improves the efficiency of pile cutting.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0054] 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, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for the secondary utilization of over-poured concrete in cast-in-place piles, characterized in that, The system includes an upper pile-cutting cauldron and a lower pile-cutting cauldron. The upper pile-cutting cauldron includes a first outer sleeve, an inner sleeve at the upper part of the first outer sleeve, and a first conical cylinder at the lower part of the first outer sleeve. The first inner sleeve is fixed to the top of the first conical cylinder, and the first conical cylinder is fixed to the bottom of the first outer sleeve. The first conical cylinder communicates with the first inner sleeve. The first outer sleeve, the first conical cylinder, and the outer side of the first inner sleeve form a first overfilled concrete receiving cavity. The lower pile cauldron includes a second outer sleeve, a second inner sleeve in the upper part of the second outer sleeve, and a second conical cylinder in the lower part of the second outer sleeve. The second inner sleeve is fixed to the top of the second conical cylinder, and the second conical cylinder is fixed to the bottom of the second outer sleeve. The second conical cylinder communicates with the second inner sleeve. The second outer sleeve, the second conical cylinder, and the outer side of the second inner sleeve form a second overfilled concrete receiving cavity. The upper pile cauldron is mounted on the lower pile cauldron, thereby connecting the first inner sleeve and the second inner sleeve.

2. The device for secondary utilization of over-poured concrete in cast-in-place piles according to claim 1, characterized in that: It also includes a circumferential rubber strip set on the outside of the reinforcing cage for use at the concrete protective layer of the pile. After the rubber strip is peeled off, a circumferential groove is formed to eliminate the need for manual circumferential cutting.

3. The device for secondary utilization of over-poured concrete in cast-in-place piles according to claim 2, characterized in that: Multiple hollow pre-embedded pipes are circumferentially inserted through the lower part of the rubber strip. A portion of the hollow pre-embedded pipes extends into the interior of the rubber strip to form a broken pile hole in the concrete pile.

4. The device for secondary utilization of over-poured concrete in cast-in-place piles according to claim 3, characterized in that: A guide mechanism is provided between the upper and lower pile cauldrons.

5. The device for secondary utilization of over-poured concrete in cast-in-place piles according to claim 4, characterized in that: The guiding mechanism includes a guide rod disposed on the outer wall of the second outer sleeve and a guide bolt disposed on the outer wall of the first outer sleeve, and a guide groove corresponding to the guide bolt is provided on the guide rod.

6. The device for secondary utilization of over-poured concrete in cast-in-place piles according to claim 5, characterized in that: The first outer sleeve of the upper pile cauldron is fitted inside the second outer sleeve of the lower pile cauldron, and the two overlap at the second outer sleeve; a lifting position is provided in the first outer sleeve.

7. The device for secondary utilization of over-poured concrete in cast-in-place piles according to claim 6, characterized in that: A stepped surface is provided at the junction of the first inner sleeve and the first conical cylinder, and the top of the second inner sleeve is supported under the stepped surface.

8. A method for the secondary utilization of over-poured concrete in cast-in-place piles, characterized in that, This method employs the secondary utilization device for over-poured concrete in cast-in-place piles as described in claim 7, comprising: Measure and mark the location of the pile hole, position the drilling rig, drill to form the pile hole, inspect the completed hole and measure the pile top elevation; Fabricate a reinforcing cage, mark the measured pile top elevation on the reinforcing cage, clean the hole, and hoist the reinforcing cage into the pile hole; At a position a certain distance above the pile top elevation marked on the reinforcing cage, the rubber strip is pre-embedded. The rubber strip is sleeved on the outside of the reinforcing cage, and multiple hollow pre-embedded pipes are circumferentially inserted through the lower part of the rubber strip. The upper and lower pile cauldrons are pre-embedded and placed inside the steel cage. The bottom of the lower pile cauldron is supported on the annular inner reinforcement of the steel cage. During the installation of the upper and lower pile cauldrons, the guide mechanism aligns the upper and lower pile cauldrons. Once the upper pile cauldron is in place, the top of the second inner sleeve of the lower pile cauldron is supported under the stepped surface of the upper pile cauldron. The top of the upper pile cauldron is supported to prevent the reinforcing cage, the embedded rubber strip, and the upper and lower pile cauldrons from floating during the process of pouring concrete into the pile hole. A guide tube is placed downwards from the first inner sleeve of the upper pile cauldron and the second inner sleeve of the lower pile cauldron, and then the pile hole is cleaned a second time. Concrete is poured into the pile hole from bottom to top through a guide pipe. The concrete gradually fills the pile hole from bottom to top until it reaches the bottom of the lower section pile cauldron. The amount of concrete to be poured over is estimated, and then the pile hole is over-poured. After the over-pour amount is reached, the concrete pouring is stopped, and the concrete pouring is completed. During the over-pouring process, the over-pouring concrete flows upward along the second inner sleeve and the first inner sleeve into the first over-pouring concrete receiving cavity of the upper pile cauldron; if the over-pouring process ends and the guide tube is pulled out, and the first over-pouring concrete receiving cavity is full, then the upper pile cauldron is lifted first, and the upper pile cauldron slides upward along the guide mechanism. During the separation process from the lower pile cauldron, the over-pouring concrete flows downward along the first inner sleeve into the second over-pouring concrete receiving cavity of the lower pile cauldron. The upper and lower pile cauldrons are lifted out, and the concrete in them is reused in various ways, such as to make concrete bricks, drainage ditches, cover plates, curb stones or cast-in-place foundation pads. After curing the poured concrete piles for 7-14 days, the soil around the pile top is excavated to expose the pile head. At the pile top, the rubber strip in the concrete protective layer is peeled off to form a circumferential groove in the concrete protective layer, eliminating the need for manual circumferential cutting. Multiple steel rods are inserted along the pre-reserved broken pile holes of each hollow pre-embedded pipe, and horizontal force is applied alternately by manual or mechanical means to form a regular horizontal crack along the circumference of the pile top, thereby completing the operation of cutting the pile head. The severed pile head was lifted out, and the top of the pile was manually repaired.

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