A piling device for a reinforced composite drainage pile and a construction method thereof

Abstract

The application discloses a piling equipment for a stiff-core composite drainage pile, which comprises a stiff-core steel pipe, an outer steel pipe support coaxially arranged outside the stiff-core steel pipe, and a pile body excavation and pouring assembly detachably connected at the bottom and comprising an air pipeline vertically penetrating through the pile body excavation and pouring assembly along an axial direction and arranged between the stiff-core steel pipe and the outer steel pipe support, a first grouting channel arranged above a water-permeable layer, a second grouting channel arranged above an inner layer of the stiff core, a first grouting channel arranged above the water-permeable layer, and a second grouting channel arranged above the inner layer of the stiff core. The stiff-core composite drainage pile is formed by simultaneously performing cast-in-situ construction on the water-permeable shell and the stiff core through the equipment, the construction efficiency is accelerated, the use of a prefabricated pile stacking site can be greatly reduced, the site space utilization rate is increased, and the excavation method instead of the prefabricated static pressure pile is used, so that the soil squeezing effect is not generated and the construction is facilitated.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of geotechnical engineering, and particularly relates to a pile-forming equipment for a stiff-core composite drainage pile and a construction method thereof. BACKGROUND

[0002] Soft soil mainly refers to silt deposits and a small amount of humus material, which has the characteristics of high natural water content, high compressibility, low bearing capacity and very low shear strength. Therefore, when a building uses soft soil as a foundation soil, the soft soil foundation needs to be treated. The drainage consolidation method is usually used for treatment in engineering. The drainage consolidation method usually uses a drainage pile with certain bearing capacity and good water permeability as a drainage passage, which can accelerate the drainage consolidation. Although the current traditional drainage pile can meet the drainage requirements, its supporting capacity is obviously insufficient. Increasing the number of pile foundations will greatly increase the engineering budget, and the effect is limited. The insufficient pile bearing capacity will lead to an increase in foundation settlement and differential settlement, and even may cause the building to tilt, change the stress of the pile cap or raft, and cause construction hazards. SUMMARY

[0003] The present application provides a pile-forming equipment for a stiff-core composite drainage pile and a construction method thereof, which can effectively solve the problem of soft soil foundation needing to be treated by simultaneously casting the water-permeable shell and the stiff core through the equipment to form a stiff-core composite drainage pile with strong bearing capacity.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: a pile-forming equipment for a stiff-core composite drainage pile, comprising:

[0005] a stiff-core steel pipe;

[0006] an outer steel pipe support coaxially arranged outside the stiff-core steel pipe;

[0007] a water-permeable layer between the stiff-core steel pipe and the outer steel pipe support, and a stiff-core inner layer inside the stiff-core steel pipe;

[0008] a pile body excavation and pouring assembly, the bottom of which is detachably connected with the stiff-core steel pipe and the outer steel pipe support, and is used for fixing and installing the stiff-core steel pipe and the outer steel pipe support into a pre-buried hole, comprising:

[0009] an air pipeline vertically penetrating the pile body excavation and pouring assembly along the axial direction, and being arranged between the stiff-core steel pipe and the outer steel pipe support, and being used for injecting inert gas into the soil;

[0010] a grouting channel, comprising a first grouting channel arranged above the water-permeable layer, and a second grouting channel arranged above the stiff-core inner layer; a water jet is connected below the first grouting channel for water-permeable layer construction, and a stiff-core water jet is connected below the second grouting channel.

[0011] The suction channel includes a first suction channel arranged above the water-permeable layer and a second suction channel arranged above the inner layer of the steel pipe;

[0012] The steel pipe is connected to the bottom of the pile body excavation and pouring assembly through a first driving member, and the outer steel pipe support is connected to the bottom of the pile body excavation and pouring assembly through a second driving member, and a distance measuring instrument is arranged on the first driving member and the second driving member;

[0013] The water-permeable layer construction water knife supplies water through the first grouting channel to excavate the first soil layer between the steel pipe and the outer steel pipe support, and the first suction channel is used to extract the mud excavated in the first soil layer;

[0014] The steel pipe construction water knife supplies water through the second grouting channel to excavate the second soil layer in the steel pipe, and the second suction channel is used to extract the mud excavated in the second soil layer.

[0015] As a preferred embodiment of the present application: the first driving member and the second driving member are connected to the pile body excavation and pouring assembly through a connecting member, and the connecting member includes:

[0016] A sliding block sliding rail is arranged between the steel pipe and the first driving member;

[0017] A roller sliding rail is arranged between the outer steel pipe support and the second driving member.

[0018] As a preferred embodiment of the present application: the first driving member and the second driving member are both hydraulic push rods, and an electromagnet is fixedly arranged at the bottom end of the hydraulic push rod to fixedly connect the steel pipe and the outer steel pipe support to the bottom of the pile body excavation and pouring assembly.

[0019] As a preferred embodiment of the present application: a crossbar is symmetrically arranged on the outer side of the steel pipe along its axis, the crossbar is arranged along the length direction of the steel pipe, the length of the crossbar gradually increases from top to bottom along the steel pipe, and a ring-shaped steel sheet with holes is fixedly arranged on the crossbar, and the steel sheet is used to coordinate the stress of the material.

[0020] As a preferred embodiment of the present application: the steel pipe is provided with multiple sections, and each section of the steel pipe is connected through a splicing groove.

[0021] On the other hand, a construction method of a piling equipment for a steel pipe composite drainage pile, characterized in that it comprises the following steps:

[0022] A, pre-buried positioning hole: pre-buried positioning hole to determine the piling depth and position;

[0023] B, installation device: the pile body excavation pouring assembly is hoisted to the above of the designated position, the distance measuring instrument is opened, and the driving member is controlled to move so that it is on a circle, at this time the outer steel pipe support is installed to the bottom of the pile body excavation pouring assembly;

[0024] C, press into the outer steel pipe support: the outer steel pipe support is pressed into the soil body through the driving member, and the next section of the outer steel pipe support is connected on the driving member repeatedly;

[0025] D, excavate the pile body space: the high-pressure water is sprayed to excavate the soil body by using the water jet of the construction of the permeable layer and the water jet of the construction of the core below the grouting channel of the permeable layer and the grouting channel of the core; at the same time, the air pipeline is injected into the soil body, and inert gas is injected into the air pipeline; the mud after construction is extracted by using the water jet of the construction of the permeable layer and the water jet of the construction of the core of the grouting channel of the permeable layer and the grouting channel of the core;

[0026] E, put the core steel pipe: the distance measuring instrument is opened, the driving member and the steel pipe support are ensured to be concentric, the segmented core steel pipe is fixed on the driving member, and is sequentially placed into the pile body space, and each section of the core steel pipe is connected through the splicing groove;

[0027] F, inject the pile-forming material: the construction waste is injected between the outer steel pipe support and the core steel pipe by using the water jet of the construction of the permeable layer connected with the grouting pipeline of the permeable layer, and the concrete liquid is injected into the pile body space in the core steel pipe by using the water jet of the construction of the core connected with the grouting channel of the core;

[0028] G, recover the outer steel pipe support: after the outer steel pipe support and the driving member are fixed, the outer steel pipe support is taken out of the soil body by hoisting the pile body excavation pouring assembly;

[0029] H, the whole device is hoisted to other positions, and steps A-G are repeated until the remaining pile construction is completed;

[0030] I, recover and clean the device.

[0031] As a preferred embodiment of the present application: in step E, the splicing groove is rotated by an angle by rotating the core steel pipe around the axis by an angle, the constraint of the clamping groove is released, and the plurality of core steel pipes are separated.

[0032] As a preferred embodiment of the present application: in step F, when the plastic and the construction waste are injected to each cross rod, a ring-shaped steel sheet with holes is placed, the outer diameter of the steel sheet matches the outer diameter of the cross rod, and the inner diameter of the steel sheet gradually increases from top to bottom along the length direction of the core steel pipe.

[0033] Compared with the prior art, the present application has the following beneficial effects:

[0034] (1) The method of the present application changes the traditional method of using prefabricated pile construction to form a stiff core composite drainage pile, and uses equipment to simultaneously cast the water permeable shell and the stiff core to form a stiff core composite drainage pile, which can greatly reduce the use of prefabricated pile stacking site and increase the space utilization rate; and uses the method of digging a hole instead of prefabricated static pressure pile, which does not have the effect of soil compaction, and is beneficial to the construction;

[0035] (2) The present application uses building debris as the material for making the water permeable shell, which realizes the engineering reuse of building debris, and at the same time, uses the space between the building debris as a drainage channel on the water permeable shell, which improves the utilization rate of resources and saves labor cost and construction cost;

[0036] (3) The present application uses high-pressure water jet to excavate soil, and at the same time, the mud discharge pipe in the excavation device discharges mud, which has the advantages of green and high efficiency compared with the traditional excavation mode;

[0037] (4) The prefabricated steel pipe used in the present application can be used as a supporting structure during the construction of the stiff core, which can effectively prevent the water permeable shell and the stiff core from collapsing and forming pile quality problems, and can effectively improve the pile quality;

[0038] (5) The present application has a water permeable shell construction assembly and a stiff core construction assembly to form a stiff core composite drainage pile, which has good bearing capacity and can greatly improve the uniformity and overall strength of the foundation;

[0039] (6) The present application has an air pipe and uses air flushing method to effectively avoid soil liquefaction during excavation;

[0040] (7) The present application has a group of crossbars and perforated steel sheets, which have the same function as ordinary pile caps and can ensure the deformation coordination of the inner and outer piles;

[0041] (8) The present application has multiple tracks that can adapt to different prefabricated steel pipes and can meet various construction requirements. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 A-A' cross-sectional view of the pile forming equipment of the present application;

[0043] Figure 2 B-B' cross-sectional view of the pile forming equipment of the present application;

[0044] Figure 3 Top view of the present application;

[0045] Figure 4 Local view of the slide block slide rail and water jet in the pile forming equipment of the present application;

[0046] Figure 5 Local view of the slide block slide rail and water jet in the pile forming equipment of the present application;

[0047] Figure 6 Figure is a schematic diagram of the roller slide rail in the pile-forming equipment of the present application;

[0048] Figure 7 Figure is a schematic diagram of the steel pipe of the present application;

[0049] Figure 8 Figure is a schematic diagram of the water jet distribution of the present application;

[0050] Figure 9 Figure is a schematic diagram of the slide rail distribution of the present application;

[0051] In the figure, the reference signs are as follows: 1-1, air duct; 1-2-1, water-permeable layer grouting passage ①; 1-2-2, water-permeable layer grouting passage ②; 1-3-1, stiff core grouting passage ①; 1-3-2, stiff core grouting passage ②; 1-4-1, stiff core grouting passage ①; 1-4-2, stiff core grouting passage ②; 1-5, distance measuring instrument; 1-6-1, water-permeable layer grouting passage ①; 1-6-2, water-permeable layer grouting passage ②; 1-7, roller slide rail; 1-8, hydraulic push rod; 1-9, electromagnet; 1-10-1, water-permeable layer construction water jet; 1-10-2, stiff core construction water jet; 1-11, slide block slide rail; 2-1, outer steel pipe support; 2-2, cross bar; 2-3, stiff core steel pipe; 2-4, perforated steel sheet; 2-5, splicing groove. DETAILED DESCRIPTION

[0052] The present application will be further illustrated below in conjunction with the accompanying drawings and specific examples, which should be understood as merely illustrative of the present application and not intended to limit the scope of the present application, and after reading the present application, those skilled in the art can make various equivalent modifications to the present application, which all fall within the scope defined by the claims attached hereto.

[0053] Referring to Figures 1 to 8 The technical solution provided by the present application is a kind of stiff core composite drainage pile and pile-forming equipment thereof, which comprises a pile body excavation and pouring assembly, a stiff core steel pipe and an outer steel pipe support structure.

[0054] The pile body excavation pouring assembly is overall a flat cylinder, ten channels are opened at the top of the device and four groups of distance measuring instruments 1-5 are embedded, the channels are two groups of air pipes 1-1, water permeable layer grouting channel 1-2-1, water permeable layer grouting channel 1-2-2, water permeable layer pumping channel 1-6-1, water permeable layer pumping channel 1-6-2, core pumping channel 1-4-1, core pumping channel 1-4-2, core grouting channel 1-3-1 and core grouting channel 1-3-2;

[0055] The column steel pipe and outer steel pipe support structure include an outer steel pipe support 2-1 and a core steel pipe 2-3, the outer steel pipe support 2-1 refers to a steel pipe of a certain specification, and the outer steel pipe support 2-1 is connected to the pile body excavation pouring assembly by the electromagnet 1-9. The core steel pipe 2-3 is connected to the pile body excavation pouring assembly by the electromagnet 1-9, and the core steel pipe 2-3 has a horizontal rod 2-2 gradually lengthening downward outside; during construction, the horizontal rod 2-2 is placed with a hole steel sheet 2-4;

[0056] Further, the pile body excavation pouring assembly is provided with two groups of air pipes 1-1, sliding block rails 1-11, roller rails 1-7, distance measuring instruments 1-5, water permeable layer construction water knives 1-10-1 and core construction water knives 1-10-2;

[0057] Further, two of the water permeable layer construction water knives 1-10-1 are connected to the water permeable layer grouting channel 1-2-1 and the water permeable layer grouting channel 1-2-2, and the other two water permeable layer construction water knives 1-10-1 are connected to the water permeable layer pumping channel 1-6-1 and the water permeable layer pumping channel 1-6-2. Two of the core construction water knives 1-10-2 are connected to the core grouting channel 1-3-1 and the core grouting channel 1-3-2, and the other two core construction water knives 1-10-2 are connected to the core pumping channel 1-4-1 and the core pumping channel 1-4-2;

[0058] Further, the air pipe 1-1 is in the form of a cylinder and penetrates through the entire device, so that it can be deeply inserted into the excavation part;

[0059] Further, the roller rails 1-7 and the sliding block rails 1-11 are both installed below the pile body excavation pouring assembly;

[0060] Further, the distance measuring instrument 1-5, a group is installed on the hydraulic push rod 1-8 connected with the roller slide rail 1-7, another group is installed at the middle of the pile body excavation pouring device, the distance measuring instrument 1-5 uses satellite positioning technology, its technical principle is that all the distance measuring instruments 1-5 work simultaneously, the position on the earth is determined respectively, so as to determine the steel pipe layout;

[0061] Further, the outside of the stiff core steel pipe 2-3 in the stiff core steel pipe and outer steel pipe supporting structure has a series of cross bars 2-2, and the cross bars 2-2 gradually lengthen downward; the hole steel sheet 2-4 is annular, which is matched with the cross bar 2-2, and has different specifications of inner and outer diameters.

[0062] In order to better achieve the above-mentioned purposes, according to the above-mentioned construction method, characterized in that, comprising the following steps:

[0063] A pre-buried positioning hole: pre-buried positioning hole, determine the pile depth and position;

[0064] B installation device: hoist the pile body excavation pouring assembly to the upper 2m of the specified position, check whether the distance measuring instrument 1-5, the hydraulic push rod 1-8, the electromagnet 1-9 and other devices can work normally. Turn on the distance measuring instrument 1-5 in the middle of the pile body excavation pouring assembly and the pre-installed distance measuring instrument 1-5 on the outermost hydraulic push rod 1-8 connected with the roller slide rail 1-7, so that the outermost hydraulic push rod 1-8 connected with the roller slide rail 1-7 moves to the appropriate position and ensures that it is on a circle. Turn on the upper connected electromagnet 1-9, and adsorb the 1.8m outer steel pipe support 2-1;

[0065] C press into outer steel pipe support structure: use the hydraulic push rod 1-8 to press the outer steel pipe support 2-1 into the soil, and repeatedly connect the next section of the outer steel pipe support 2-1 on the electromagnet 1-9, first connect with the previous section of the outer steel pipe support 2-1 through the splicing groove 2-5, and then press into the soil, until pressed into the pile control depth;

[0066] D excavate the pile body space: use two water permeable layer construction water knives 1-10-1 connected with the water permeable layer grouting channel 1-2-1 and the water permeable layer grouting channel 2 respectively, and two stiff core construction water knives 1-10-2 connected with the stiff core grouting channel 1-3-1 and the stiff core grouting channel 2 respectively, to spray high-pressure water to excavate the soil. At the same time, inject the air pipeline 1-1 into the soil, and inject inert gas into it; use two water permeable layer construction water knives 1-10-1 connected with the water permeable layer grouting channel 1-6-1 and the water permeable layer grouting channel 2 respectively, and two stiff core construction water knives 1-10-2 connected with the stiff core grouting channel 1-4-1 and the stiff core grouting channel 2 respectively, to extract the mud after construction;

[0067] E. Put the steel pipe: open the distance measuring instrument 1-5 on the hydraulic push rod 1-8 connected with the roller slide rail 1-7, ensure that the hydraulic push rod 1-8 and the outer steel pipe support 2-1 are concentric circles, and meet the construction requirements; connect the segmented steel pipe 2-3 on the electromagnet 1-9 on the hydraulic push rod 1-8, and put it into the pile space that has been excavated in turn, and connect each segment of the steel pipe 2-3 through the splicing groove 2-5;

[0068] F. Inject pile-forming material: use two water-permeable layer construction water knives 1-10-1 connected with water-permeable layer grouting pipeline 1-2-1 and water-permeable layer grouting channel 1-2-2 respectively to inject plastic and construction waste between the outer steel pipe support 2-1 and the steel pipe 2-3, and put a ring-shaped steel sheet 2-4 into each cross bar 2-2; at the same time, use the steel pipe construction water knife 1-10-2 connected with the steel pipe grouting channel 1-3-1 and the steel pipe grouting channel 1-3-2 respectively to inject concrete liquid into the inside of the steel pipe 2-3;

[0069] G. Recover the outer steel pipe support structure: use the splicing groove 2-5 on the outer steel pipe support 2-1 to separate each segment of the outer steel pipe support 2-1, and take it out of the soil body through the hydraulic push rod 1-8 and the electromagnet 1-9;

[0070] H. Repeat steps A to G to complete the construction of the remaining pile body: lift the device as a whole to other positions, and continue construction by repeating steps a-g; I. Recover and clean the device: recover the device, check whether the device is damaged, and clean it thoroughly before storing it properly;

[0071] In steps B and C, the electromagnet 1-9 is turned on and off to attract and release the outer steel pipe support 2-1 and the steel pipe 2-3.

[0072] In steps C and E, the outer steel pipe support 2-1 and the steel pipe 2-3 used can be made of various specifications of prefabricated steel pipes through the roller slide rail 1-7 to adapt to different site requirements for different foundation bearing capacities.

[0073] In steps D and F, the water-permeable layer construction water knife 1-10-1 and the steel pipe construction water knife 1-10-2 have a certain moving ability in space through the sliding block slide rail 1-11 and the hydraulic push rod 1-8.

[0074] The soil excavation mode in step D is to use two water jetting tools 1-10-1 connected with the water permeable layer grouting channel 1-2-1 and the water permeable layer grouting channel 1-2-2 respectively and two rigid core construction water jetting tools 1-10-2 connected with the rigid core grouting channel 1-3-1 and the rigid core grouting channel 1-3-2 respectively to spray high pressure water for construction. At the same time, the water jetting tools 1-10-1 connected with the water permeable layer grouting channel 1-6-1 and the water permeable layer grouting channel 1-6-2 and the rigid core construction water jetting tools 1-10-2 connected with the rigid core grouting channel 1-4-1 and the rigid core grouting channel 1-4-2 are used to discharge mud outside the pile space.

[0075] In step D, the inert gas is injected into the soil through the air pipe 1-1, which can prevent the soil from liquefying during the excavation process.

[0076] In steps C, E and G, the process of connecting or separating each section of the prefabricated steel pipe by using the splicing groove 2-5 refers to rotating the steel pipe around the axis by an angle, rotating the splicing groove (2-5) and separating the steel pipe from the clamping groove.

[0077] In step F, the grouting process refers to using two water jetting tools 1-10-1 connected with the water permeable layer grouting channel 1-2-1 and the water permeable layer grouting channel 1-2-2 to spray plastic and building debris between the outer steel pipe support 2-1 and the rigid core steel pipe 2-3; at the same time, two rigid core construction water jetting tools 1-10-2 connected with the rigid core grouting channel 1-3-1 and the rigid core grouting channel 1-3-2 are used to spray concrete.

[0078] In step F, the hole steel sheet 2-4 is placed on the cross bar 2-2 to ensure the coordinated deformation of the inner and outer rigid bodies.

[0079] In step F, the voids in the plastic and building debris used in the construction of the rigid core composite drainage pile can be used as drainage channels.

[0080] The above description is only the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the scope of protection of the present application.

Claims

1. A piling apparatus for a reinforced composite displacement pile, characterized by, The utility model relates to a kind of pile body excavation and pouring assembly, including: Rigid core steel pipe; Outer steel pipe support, coaxially arranged outside the rigid core steel pipe; Water-permeable layer between the rigid core steel pipe and outer steel pipe support, and rigid core inner layer inside the rigid core steel pipe; The bottom of the pile body excavation and pouring assembly is detachably connected with the rigid core steel pipe and outer steel pipe support, and is used to fix and install the rigid core steel pipe and outer steel pipe support into the pre-buried hole, comprising: Air duct, vertically penetrating the pile body excavation and pouring assembly along the axial direction, is arranged between the rigid core steel pipe and outer steel pipe support, and is used to inject inert gas into the soil body; Grouting channel, including first grouting channel arranged above water-permeable layer, and second grouting channel arranged above rigid core inner layer;The first grouting channel is connected with water-permeable layer construction water knife below, and the second grouting channel is connected with rigid core construction water knife below; Suction channel, including first suction channel arranged above water-permeable layer, and second suction channel arranged above rigid core inner layer; The rigid core steel pipe is connected with the bottom of the pile body excavation and pouring assembly through the first driving element, and the outer steel pipe support is connected with the bottom of the pile body excavation and pouring assembly through the second driving element, and distance measuring instrument is arranged on the first driving element and the second driving element; The first driving element, the second driving element and the pile body excavation and pouring assembly are connected through the connecting piece, and the connecting piece comprises: Slide rail, arranged between the rigid core steel pipe and the first driving element; Roller slide rail, arranged between the outer steel pipe support and the second driving element; The water-permeable layer construction water knife is supplied with water through the first grouting channel, and the first soil layer between the rigid core steel pipe and the outer steel pipe support is excavated, and the first suction channel is used to extract the mud after construction excavation in the first soil layer; The rigid core construction water knife is supplied with water through the second grouting channel, and the second soil layer in the rigid core steel pipe is excavated, and the second suction channel is used to extract the mud after construction excavation in the second soil layer.

2. A piling apparatus for a stiff core composite displacement pile according to claim 1, wherein The first driving element and the second driving element are both hydraulic push rods, and the bottom end of the hydraulic push rod is fixedly provided with an electromagnet, which is used to fixedly connect the rigid core steel pipe and the outer steel pipe support with the bottom of the pile body excavation and pouring assembly.

3. A piling apparatus for a stiff core composite displacement pile according to claim 1, wherein The outer side of the rigid core steel pipe is symmetrically provided with a crossbar along its axis, the crossbar is arranged along the length direction of the rigid core steel pipe, and the length of the crossbar gradually increases from top to bottom along the rigid core steel pipe, and a ring-shaped steel sheet with holes is fixedly arranged on the crossbar, and the steel sheet is used to coordinate material stress.

4. A piling apparatus for a stiff core composite displacement pile according to claim 1, wherein The rigid core steel pipe is provided with multiple sections, and each section of the rigid core steel pipe is connected through a splicing groove.

5. A construction method based on the piling equipment for the core composite drainage pile according to any one of claims 1-4, characterized in that, The utility model relates to a kind of pile body excavation and pouring assembly, including following steps: A, pre-buried positioning hole: pre-buried positioning hole is determined to be piled depth and position; B, installation device: the pile body excavation and pouring assembly is hoisted to the specified position above, the distance measuring instrument is opened, and the driving element is controlled to move, so that it is on a circle, at this time, the outer steel pipe support is installed to the bottom of the pile body excavation and pouring assembly; C, press into outer steel pipe support: the outer steel pipe support is pressed into the soil body by the driving element, and the next section of outer steel pipe support is connected on the driving element repeatedly; D. Excavate the pile space: use the water jet set in the permeable layer grouting channel and the core grouting channel to spray high pressure water to excavate the soil; at the same time, inject air pipes into the soil and inject inert gas into the soil; use the water jet set in the permeable layer grouting channel and the core grouting channel to extract the mud after construction; E. Put the core steel pipe: open the distance measuring instrument, ensure that the driving part and the steel pipe support are concentric, fix the segmented core steel pipe on the driving part, and put it into the pile space in turn, and each segment of the core steel pipe is connected through the splicing groove; F. Inject pile-forming material: use the water jet connected with the permeable layer grouting pipe to inject construction waste between the outer steel pipe support and the core steel pipe, and use the core construction water jet connected with the core grouting channel to inject concrete liquid into the pile space in the core steel pipe; G. Recover the outer steel pipe support: after fixing the outer steel pipe support and the driving part, use the pile excavation and pouring assembly to take out the outer steel pipe support from the soil; H. Lift the whole device to another position, repeat steps A-G until the remaining pile construction is completed; I. Recover and clean the device.

6. The construction method of a piling apparatus for a stiff core composite pile according to claim 5, wherein In step E, rotate the core steel pipe around the axis by an angle, rotate the splicing groove by an angle, separate the multiple core steel pipes from the clamping groove, and separate the multiple core steel pipes.

7. The construction method of a piling apparatus for a stiff core composite pile according to claim 5, wherein In step F, when injecting plastic and construction waste into each horizontal rod, put a ring-shaped steel sheet with holes into it, the outer diameter of the steel sheet matches the outer diameter of the horizontal rod, and the inner diameter of the steel sheet gradually increases from top to bottom along the length direction of the core steel pipe.

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