Front-supporting type grouting steel pipe pile with adjustable bag and using method of front-supporting type grouting steel pipe pile

Abstract

The invention relates to the technical field of constructional engineering, and provides a bag-adjustable front supporting type grouting steel pipe pile and a using method thereof.The bag-adjustable front supporting type grouting steel pipe pile comprises a first steel pipe section and a second steel pipe section which are connected through threads, and a plurality of open holes distributed in the length direction of a steel pipe are formed in the pipe side of the first steel pipe section; a plurality of pile body grouting holes distributed in the length direction of a steel pipe of the second steel pipe section are formed in the pipe side of the second steel pipe section, the first steel pipe section is configured to move in the axial direction of the second steel pipe section under the action of external force, and the open holes are aligned with the pile body grouting holes; and a layer of chambering bag is bound on the surfaces of the plurality of layers of holes. The position and grouting amount of the bag can be flexibly adjusted by adjusting the axial movement of the first steel pipe section on the second steel pipe in real time according to the density and permeability of a soil layer, so that it is ensured that grouting materials can be evenly distributed in the soil layer, and the stability and bearing capacity of a pile foundation are improved.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a bag-adjustable front-supported grouting steel pipe pile and a use method thereof. Background Art

[0002] In the field of construction engineering, steel pipe piles are a commonly used foundation structure, which is widely used due to its advantages such as strong bearing capacity, fast construction speed and strong adaptability. However, in the construction process of steel pipe piles, grouting is a key step to ensure the stability and bearing capacity of the pile foundation. The purpose of grouting is to inject cement slurry or other filling materials into the soil layer around the pile to fill the voids in the soil layer, improve the integrity and density of the soil, and thus enhance the bearing capacity and stability of the pile foundation.

[0003] The traditional grouting method usually includes the following steps: first, the steel pipe pile is driven or drilled into the soil layer at a predetermined depth; then, a bag is set at the predetermined position of the steel pipe pile; then, cement slurry or other filling materials are injected through the bag; finally, after the filling material solidifies, the pile foundation construction is completed. In this process, the control of the grouting amount and the adjustment of the bag position are crucial to ensure the construction quality and pile foundation performance.

[0004] However, the traditional construction method has some shortcomings. First, the control of the grouting amount often relies on the experience and judgment of the construction personnel, and lacks an accurate measurement and adjustment mechanism. This may lead to too much or too little grouting, affecting the stability and bearing capacity of the pile foundation. Secondly, the adjustment of the bag position is usually limited by site conditions, such as the unevenness of the soil layer, the inclination of the steel pipe pile and other factors, which makes the adjustment of the bag position not accurate enough and it is difficult to achieve uniform distribution of the grouting material. In addition, the traditional grouting method may encounter a variety of uncertain factors during the construction process, such as uneven settlement of the soil layer, changes in the groundwater level, etc., all of which may affect the grouting effect and the performance of the pile foundation.

[0005] Therefore, in order to overcome these shortcomings, technical personnel in this field need to design a bag-adjustable front-supported grouting steel pipe pile to improve the accuracy and efficiency of steel pipe pile construction. Summary of the invention

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a bag-adjustable front-supported grouting steel pipe pile, comprising a first steel pipe section and a second steel pipe section, wherein the first steel pipe section and the second steel pipe section are connected by threads, a plurality of openings distributed along the length direction of the steel pipe are provided on the pipe side of the first steel pipe section, a plurality of pile body grouting holes distributed along the length direction of the steel pipe are provided on the pipe side of the second steel pipe section, the first steel pipe section is configured to move along the axial direction of the second steel pipe section under the action of an external force, and align the openings with the pile body grouting holes; a layer of hole-expanding bag is tied to the surface of the openings of the plurality of layers.

[0008] Preferably, the grouting holes of the pile body are distributed in a 45° ring shape along the pile body of the second steel pipe section, and are arranged in an equidistant array in the axial downward direction of the second steel pipe section.

[0009] Furthermore, the end of the second steel pipe section is a pile tip, and the pile tip is in a conical shape. The pile tip is provided with pile tip slurry outlet holes distributed in an annular manner.

[0010] In order to ensure the grouting effect of the grouting hole at the pile tip of the second steel pipe section and the bearing strength of the first steel pipe section, the area of ​​the opening is three times the area of ​​the grouting hole of the pile body.

[0011] Furthermore, a grouting pipe is symmetrically arranged in the second steel pipe section, and the diameter of the grouting pipe is 1 / 10 of the diameter of the second steel pipe section.

[0012] Furthermore, the first steel pipe section and the second steel pipe section are both hollow thin-walled cylindrical steel pipe piles.

[0013] Furthermore, the expanded pore bags are spaced apart by openings of the same number of layers.

[0014] Furthermore, both ends of each layer of hole-expanding bladder are tied and fixed to the outer peripheral surface of the first steel pipe section by a hoop, and the distance between the two hoop of the same hole-expanding bladder is equal.

[0015] Furthermore, barbs are fully welded under the opening of the untied expansion bag.

[0016] Furthermore, the tube side of the first steel pipe section is provided with a plurality of first fixing holes along the length direction of the steel pipe, and the tube side of the second steel pipe section is provided with a plurality of second fixing holes along the length direction of the steel pipe, and the first fixing holes and the second fixing holes are fixed by fasteners. Preferably, the fasteners may be threaded rods and nuts. Preferably, the second fixing holes are arranged at a position 1 / 4 of the thread length of the second steel pipe section from the thread end of the second steel pipe section, and four first fixing holes / second fixing holes are symmetrically arranged on the same horizontal plane of the first steel pipe section / second steel pipe section; the interval between each layer of first fixing holes / second fixing holes is the distance between two openings; the number of first fixing holes / second fixing holes is 1 / 2 of the number of openings. The first fixing holes and the second fixing holes are of the same size.

[0017] To ensure convenience and accuracy during the construction process, when processing and manufacturing the second steel pipe section and the first steel pipe section, it should be ensured that when the first steel pipe section is completely screwed into the second steel pipe section, the center point of the pile body grouting hole on the second steel pipe section corresponds to the center point of the opening of the first steel pipe section.

[0018] Furthermore, a rotating handle for adjustment is provided on the top of the first steel pipe section, and the rotating handles are symmetrically arranged. Furthermore, in order to avoid slipping when adjusting the rotating handle, the rotating handle is equipped with an anti-slip handle cover.

[0019] The preparatory work to be carried out before the present invention starts working includes:

[0020] 1) According to the engineering design drawings, use measuring tools to determine the top or required position of the second steel pipe section and mark the exact installation position of the second steel pipe section;

[0021] 2) Align the hole-expanding bag with the opening of the first steel pipe section according to design requirements, and fix the hole-expanding bag on the first steel pipe section using a hoop;

[0022] 3) Screw the first steel pipe section 2 into the second steel pipe section 14;

[0023] 4) After the first steel pipe section is screwed into the second steel pipe section, preliminary adjustments and tests are performed to ensure the responsiveness and adjustment capabilities of the entire system in actual grouting operations.

[0024] The present invention also provides a method for using the bag-adjustable front-support type grouting steel pipe pile. The method is based on the above-mentioned bag-adjustable front-support type grouting steel pipe pile, and the method comprises:

[0025] Step 1: Determine the exact position of the expansion bag according to the construction drawings and on-site measurements;

[0026] Step 2: The second steel pipe section is threadedly connected to the first steel pipe section by controlling the rotating handle to rotate in a predetermined direction (clockwise or counterclockwise); the rotation should be smooth and powerful to ensure that the first steel pipe section moves smoothly on the second steel pipe section;

[0027] Step 3: Position the drilling rig according to the positioning, prepare and mix the cement slurry, and implement the spraying and jet drilling;

[0028] Step 4: Use hydraulic pressure to slowly press the connecting piles of the second steel pipe section and the first steel pipe section into the soil layer at an angle of 45°;

[0029] Step 5: Start the pile-pressing cylinder to slowly press down the connecting steel pipe pile of the second steel pipe section and the first steel pipe section, and control the pressure speed below 2m / min until the main body of the connecting steel pipe pile is pressed into the soil;

[0030] Step 6: Determine the number and position of the expansion bags required for the connecting steel pipe pile according to the specific conditions of the on-site construction, and change the position of the bags on the first steel pipe section by rotating the first steel pipe section by rotating the handle;

[0031] Step 7: Determine whether the expansion bag reaches the predetermined position by observing the first fixing hole and the second fixing hole, and ensure that the first fixing hole and the second fixing hole of the first steel pipe section are in a line with each other;

[0032] Step 8: After the expanded bladder reaches a predetermined position, the first fixing hole and the second fixing hole are fixed by a fastener;

[0033] Step 9: Carry out constrained grouting in sections from bottom to top through the grouting pipe. The standard for the final outer side of the grouting is: the cement consumption of a single steel pipe is not less than the design value or the final grouting pressure is not less than 2MP.

[0034] The present invention has the following beneficial effects:

[0035] (1) The present invention can accurately adjust the position of the expansion bag in the steel pipe pile by rotating the first steel pipe section. The entire device is easy to operate, saving time and effort;

[0036] (2) The present invention can adjust the position of the expansion bag in real time according to the density and permeability of the soil layer, thereby ensuring the uniform distribution of the grouting material, thereby improving the effect of grouting reinforcement;

[0037] (3) The present invention can flexibly adjust the position and grouting amount of the bag by adjusting the axial movement of the first steel pipe section on the second steel pipe according to actual needs, thereby ensuring that the grouting material can be evenly distributed in the soil layer and improving the stability and bearing capacity of the pile foundation.

[0038] (4) The construction personnel of the present invention can quickly adjust the position of the bag by rotating the handle and observing the positions of the first fixing hole and the second fixing hole, thereby improving construction efficiency and reducing construction time;

[0039] (5) The present invention has a simple structure, is easy to manufacture, has a low cost, and can be mass-produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the overall structure in Example 1.

[0041] Figure 2 It is a schematic diagram of the three-dimensional structure of the second steel pipe section in Example 1.

[0042] Figure 3 It is a top view of the second steel pipe section in Example 1.

[0043] Figure 4 It is a schematic diagram of the three-dimensional structure of the first steel pipe section in Example 1.

[0044] Figure 5 yes Figure 4 Partial schematic diagram of section A.

[0045] Figure 6 yes Figure 4 Partial schematic diagram of section B. DETAILED DESCRIPTION

[0046] The specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. It should be pointed out that the embodiments are only specific explanations of the invention and should not be regarded as limitations of the invention. The purpose of the embodiments is to enable those skilled in the art to better understand and reproduce the technical solutions of the present invention. The protection scope of the present invention shall still be based on the scope defined by the claims.

[0047] Example 1

[0048] like Figure 1-2 As shown, this embodiment provides a bag-adjustable front-supported grouting steel pipe pile, comprising a first steel pipe section 2 and a second steel pipe section 1, wherein the first steel pipe section 2 and the second steel pipe section 1 are connected by threads.

[0049] The end of the second steel pipe section 1 is a pile tip 11, which is in a conical shape. The pile tip 11 is provided with pile tip slurry outlet holes 111 distributed in an annular manner. Preferably, in order to prevent the backflow of slurry during the grouting process, each pile tip slurry outlet hole 111 is equipped with a check valve, and the diameter of the check valve is slightly larger than the diameter of the pile tip slurry outlet hole. The pile tip slurry outlet hole 111 is preferably elliptical; the interval between the pile tip slurry outlet holes 111 should be determined according to actual conditions; the length of the second steel pipe section 1 generally exceeds the drilling depth, and the length and outer diameter of the second steel pipe section 1 should be determined according to the actual project. Preferably, the outer diameter of the second steel pipe section 1 is generally 80% of the drilling diameter. Preferably, in order to enable the second steel pipe section 1 to provide the necessary strength while maintaining a certain toughness and ductility, the second steel pipe section 1 is made of high-strength low-alloy steel ASTM A36.

[0050] like Figure 3 As shown, a grouting pipe hole 15 is provided at the end of the second steel pipe section 1, and a grouting pipe 4 is symmetrically provided inside the second steel pipe section. The grouting pipe 4 is fixed to the grouting pipe hole 15 by seamless welding, and the diameter of the grouting pipe 4 is 1 / 10 of the second steel pipe section. The length of the grouting pipe 4 is equal to the length of the second steel pipe section 1, and the end of the grouting pipe 4 is connected to a grouting device. The grouting pipe 4 is fixed to the grouting pipe hole 15 and is symmetrically arranged.

[0051] like Figure 4-5As shown, a plurality of openings 22 distributed along the length direction of the steel pipe are provided on the pipe side of the first steel pipe section 2, preferably the openings 22 are shaped openings, and a plurality of pile body grouting holes 12 distributed along the length direction of the steel pipe are provided on the pipe side of the second steel pipe section, and the number of pile body grouting holes 12 is determined according to the actual engineering conditions. The first steel pipe section 2 is configured to move along the axial direction of the second steel pipe section 1 under the action of external force, and align the openings 22 with the pile body grouting holes 12; a layer of expansion bag 24 is tied on the surface of the openings 22 of several layers. Preferably, in order to ensure the performance and durability of the expansion bag 24 in long-term use, the expansion bag 24 is made of high-density polyethylene as a manufacturing material. The expansion bags 24 are spaced by the same number of openings 22. In order to avoid collision between the pile body grouting holes 12 and the first steel pipe section 2 during rotation and movement, the inner diameter of the first steel pipe section 2 should be the sum of the outer diameter of the second steel pipe section 1 and twice the length of the pile body grouting holes 12. In order to ensure the grouting effect of the grouting holes of the pile body of the second steel pipe section 1 and the bearing strength of the first steel pipe section 2, the area of ​​the opening 22 is three times the area of ​​the pile body grouting holes 12. Preferably, the pile body grouting holes 12 are distributed in a 45° ring along the pile body of the second steel pipe section 1, and are equidistantly arrayed in the axial downward direction of the second steel pipe section 1.

[0052] A layer of pore-expanding bag 24 is arranged outside every two openings 22 , and each layer of pore-expanding bag 24 is spaced apart by a distance of two openings 22 .

[0053] The top of the first steel pipe section 2 is provided with a rotating handle 26 for adjustment, and four rotating handles are symmetrically arranged. To prevent the rotating handle 26 from slipping when adjusting, the rotating handle 26 is equipped with an anti-slip handle cover 27.

[0054] In order to make the first steel pipe section 2 have the function of expanding the soil outside and reduce the probability of mud and sand entering the pile body grouting hole 12 and causing the pile body grouting hole 12 to be blocked, the opening without the expansion bag is fully welded and arranged with barbs 21.

[0055] Both ends of each layer of hole-expanding bag 24 are tied and fixed to the outer peripheral surface of the first steel pipe section 2 through a hoop 23, and the distance between the two hoop 23 of the same hole-expanding bag 24 is equal.

[0056] The pipe side of the first steel pipe section 2 is provided with a plurality of first fixing holes 25 along the length direction of the steel pipe, and the pipe side of the second steel pipe section 1 is provided with a plurality of second fixing holes 13 along the length direction of the steel pipe, and the first fixing holes 25 and the second fixing holes 13 are fixed by fasteners. Preferably, the fasteners may be threaded rods 31 and nuts 32. To prevent the threaded rods 31 from moving during the grouting process, both sides are fixed with nuts 32. Preferably, the second fixing holes 13 are arranged at a position 1 / 4 of the thread length of the second steel pipe section from the thread end of the second steel pipe section, and four first fixing holes 25 / second fixing holes 13 are symmetrically arranged on the same horizontal plane of the first steel pipe section 2 / second steel pipe section 1; the interval between each layer of first fixing holes 25 / second fixing holes 13 is the distance between two openings 22; the number of first fixing holes 25 / second fixing holes 13 is 1 / 2 of the number of openings 22. The first fixing holes 25 and the second fixing holes 13 are of the same size. The size of the first fixing hole 25 / the second fixing hole 13 is determined according to the size of the first steel pipe section 2 / the second steel pipe section 1 .

[0057] like Figure 5 As shown, two groups of first fixing holes 25 of the first steel pipe segment 2 are arranged, each group has only two first fixing holes 25 on the same surface, and the first fixing holes 25 in the two groups are arranged vertically, one group of first fixing holes 25 coincides with the second fixing holes 13 at the bottom of the second steel pipe segment 1, and the other group coincides with the second to last second fixing hole 13 at the bottom of the second steel pipe segment 1, and the second fixing holes 13 of the second steel pipe segment 1 are the same size as the first fixing holes 25.

[0058] The first steel pipe section 2 and the second steel pipe section 1 are both hollow thin-walled cylindrical steel pipe piles. The pile body of the second steel pipe section 1 is processed with a unified international standard external thread 14, which adopts ISO metric thread, and the length of the external thread 14 is about 1 / 10 of the length of the second steel pipe section 1. The length and inner diameter of the first steel pipe section 2 should be determined according to the length and inner diameter of the second steel pipe section 1. The inner surface of the first steel pipe section 2 is processed with a unified international standard internal thread 28, which adopts ISO metric thread, and the length of the internal thread 28 is 1 / 2 of the length of the external thread 12. The spacing of the internal thread 28 should ensure that after the first steel pipe section 2 rotates one circle, the first steel pipe section 2 rises by the axial spacing distance of the opening 22. Figure 6 As shown,

[0059] To ensure convenience and accuracy during the construction process, when processing and manufacturing the second steel pipe section 1 and the first steel pipe section 2, it should be ensured that when the first steel pipe section 2 is completely screwed into the second steel pipe section 1, the center point of the pile body grouting hole 12 on the second steel pipe section 1 corresponds one to one with the center point of the opening 22 on the first steel pipe section 2.

[0060] The working principle of the present invention is as follows:

[0061] The external thread 14 of the second steel pipe section matches the internal thread 28 of the first steel pipe section 2. The first steel pipe section 2 can be moved axially on the second steel pipe section 1 by adjusting the rotating handle 26 manually or by power drive. Since the expansion bag 24 is fixed on the first steel pipe section 2, when the first steel pipe section 2 moves, it will directly drive the expansion bag 24 to move along the axial direction of the second steel pipe section 1. According to the spacing design between the external thread 14 of the second steel pipe section 1 and the internal thread 28 of the first steel pipe section 2 and the spacing design between the first fixing hole 25 and the second fixing hole 13, when the first steel pipe section 2 rotates a number of integer circles (n circles), the first fixing hole 25 of the first steel pipe section 2 coincides with the second fixing hole 13 of the second steel pipe section 1, and it can be determined that the center point of the opening 22 of the first steel pipe section 2 coincides with the pile tip slurry hole 12 of the second steel pipe section 1, and according to the rotation of the first steel pipe section 2 for a number of integer circles (n circles), the second steel pipe section 1 is calculated to have risen by a number (n) of the spacing between the pile tip slurry holes 12. After it is determined that the expansion bag 24 has reached the designated position, the first fixing hole 25 and the second fixing hole 13 are fixed by fasteners to prevent the device from moving during grouting.

[0062] Example 2

[0063] This embodiment provides a method for using a bag-adjustable front-supported grouting steel pipe pile.

[0064] The preparatory work to be carried out before the present invention starts working includes:

[0065] 1) According to the engineering design drawings, use measuring tools to determine the top or required position of the second steel pipe section and mark the exact installation position of the second steel pipe section;

[0066] 2) Align the hole-expanding bag 24 with the opening 22 of the first steel pipe section 2 according to design requirements, and use the hoop 23 to fix the hole-expanding bag 24 on the first steel pipe section 2;

[0067] 3) Screw the first steel pipe section 2 into the second steel pipe section 1;

[0068] 4) After the first steel pipe section 2 is screwed into the second steel pipe section 1, preliminary adjustments and tests are performed to ensure the responsiveness and adjustment capability of the entire system in the actual grouting operation. The present invention is slowly pressed into the soil layer at an angle of 45° using hydraulic pressure; then the pile-pressing cylinder is started to slowly press the present invention down, and the pressure speed is controlled to be below 2m / min until the main body of the present invention is pressed into the soil.

[0069] A method for using a bag-adjustable front-support grouting steel pipe pile comprises:

[0070] Step 1: Determine the exact position of the expansion bag according to the construction drawings and on-site measurements;

[0071] Step 2: The second steel pipe section 1 is connected to the first steel pipe section 2 by rotating the rotating handle 26 in a predetermined direction (clockwise or counterclockwise); the rotation should be smooth and powerful to ensure that the first steel pipe section 2 moves smoothly on the second steel pipe section 1;

[0072] Step 3: Position the drilling rig according to the positioning, prepare and mix the cement slurry, and implement the spraying and jet drilling;

[0073] Step 4: Use hydraulic pressure to slowly press the connecting piles of the second steel pipe section 1 and the first steel pipe section 2 into the soil layer at an angle of 45°;

[0074] Step 5: Start the pile-pressing cylinder to slowly press down the connecting steel pipe pile of the second steel pipe section 1 and the first steel pipe section 2, and control the pressure speed below 2 m / min until the main body of the connecting steel pipe pile is pressed into the soil;

[0075] Step 6: Determine the number and position of the expansion bags 24 required for the connecting steel pipe pile according to the specific conditions of the on-site construction, and rotate the first steel pipe section 2 by rotating the handle 26 to change the position of the expansion bags 24 on the first steel pipe section 2;

[0076] Step 7: Determine whether the expansion bag 24 has reached the predetermined position by observing the first fixing hole 25 and the second fixing hole 13, and ensure that the first fixing hole 25 and the second fixing hole 13 of the first steel pipe section 2 and the second steel pipe section 1 are in a line;

[0077] Step 8: After the expanded bag 24 reaches the predetermined position, the first fixing hole 25 and the second fixing hole 13 are fixed by fasteners;

[0078] Step 9: Perform constrained grouting in sections from bottom to top through the grouting pipe 4. The standard for the final outer side of the grouting is: the cement consumption of a single steel pipe is not less than the design value or the final grouting pressure is not less than 2MP.

[0079] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0080] It should be noted that the technical features not described in detail in the present invention can be implemented by any existing technology.

Claims

1. Bag-adjustable front-supported grouting steel pipe pile, characterized in that: It comprises a first steel pipe section and a second steel pipe section, wherein the first steel pipe section and the second steel pipe section are connected by threads, a plurality of openings are provided on the pipe side of the first steel pipe section and distributed along the length direction of the steel pipe, and a plurality of pile body grouting holes are provided on the pipe side of the second steel pipe section and distributed along the length direction of the steel pipe, and the first steel pipe section is configured to move along the axial direction of the second steel pipe section under the action of an external force and align the openings with the pile body grouting holes; a layer of expansion bag is tied on the surface of the openings of the plurality of layers.

2. The bag-adjustable front-support grouting steel pipe pile according to claim 1 is characterized in that: The end of the second steel pipe section is a pile tip, and the pile tip is in a conical shape. The pile tip is provided with pile tip slurry outlet holes distributed in an annular manner.

3. The bag-adjustable front-supported grouting steel pipe pile according to claim 1 is characterized in that: Grouting pipes are symmetrically arranged in the second steel pipe section.

4. The bag-adjustable front-supported grouting steel pipe pile according to claim 1, characterized in that: The first steel pipe section and the second steel pipe section are both hollow thin-walled cylindrical steel pipe piles.

5. The bag-adjustable front-supported grouting steel pipe pile according to claim 1, characterized in that: The expanded pore bags are spaced apart from each other by the same number of openings.

6. The bag-adjustable front-supported grouting steel pipe pile according to claim 1, characterized in that: Both ends of each layer of hole-expanding bladder are tied and fixed to the outer peripheral surface of the first steel pipe section through a hoop, and the distance between the two hoop of the same hole-expanding bladder is equal.

7. The bag-adjustable front-supported grouting steel pipe pile according to claim 1, characterized in that: Barbs are arranged under the opening of the untied expansion bag and fully welded.

8. The bag-adjustable front-supported grouting steel pipe pile according to claim 1, characterized in that: The first steel pipe section has a plurality of first fixing holes on its pipe side along the length direction of the steel pipe, and the second steel pipe section has a plurality of second fixing holes on its pipe side along the length direction of the steel pipe. The first fixing holes and the second fixing holes are fixed by fasteners.

9. The bag-adjustable front-supported grouting steel pipe pile according to claim 1, characterized in that: A rotating handle for adjustment is provided on the top of the first steel pipe section.

10. A method for using a bag-adjustable front-support grouting steel pipe pile, characterized in that: The method of use is based on the bag-adjustable front-support grouting steel pipe pile according to any one of claims 1 to 9, and the method of use comprises: Step 1: Determine the exact position of the expansion bag according to the construction drawings and on-site measurements; Step 2: The second steel pipe section is threadedly connected to the first steel pipe section by controlling the rotating handle to rotate in a predetermined direction; Step 3: Position the drilling rig according to the positioning, prepare and mix the cement slurry, and implement the spraying and jet drilling; Step 4: Use hydraulic pressure to slowly press the connecting piles of the second steel pipe section and the first steel pipe section into the soil layer at an angle of 45°; Step 5: Start the pile-pressing cylinder to slowly press down the connecting steel pipe pile of the second steel pipe section and the first steel pipe section, and control the pressure speed below 2m / min until the main body of the connecting steel pipe pile is pressed into the soil; Step 6: Determine the number and position of the expansion bags required for the connecting steel pipe pile according to the specific conditions of the on-site construction, and change the position of the bags on the first steel pipe section by rotating the first steel pipe section by rotating the handle; Step 7: Determine whether the expansion bag reaches the predetermined position by observing the first fixing hole and the second fixing hole, and ensure that the first fixing hole and the second fixing hole of the first steel pipe section are in a line with each other; Step 8: After the expanded bladder reaches a predetermined position, the first fixing hole and the second fixing hole are fixed by a fastener; Step 9: Carry out constrained grouting in sections from bottom to top through the grouting pipe.

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