An energy pile construction device for weakening the mud skin effect and its construction method

Abstract

The present invention discloses an energy pile construction device for weakening the mud cake effect and its construction method, which includes a drill bit assembly, comprising a shaft rod, a drill bit, an expansion member, a blasting member, a driving member and a splicing member. The drill bit is fixed to the bottom end of the shaft rod, the expansion member is arranged on the surface of the drill bit, the blasting member is arranged on the shaft rod, the driving member is fixed to the top end of the shaft rod, and the splicing member is arranged on the driving member; and a connection assembly, arranged at the end of the shaft rod, including a first connection member, a second connection member and a blocking member. By means of the arrangement of the drill bit assembly, the mud cake is removed during the process of lifting the drill bit upward, and at the same time, the friction force of the energy pile can be increased. And through the arrangement of the connection assembly, the sealing performance of the inner hole of the shaft rod is improved, so as to avoid excessive impurities from entering the shaft rod and affecting its subsequent use.

Description

Technical Field

[0001] The present invention relates to the technical field of energy pile construction, and particularly to an energy pile construction device for weakening the mud cake effect and a construction method thereof. Background Art

[0002] As a new type of building structure with both structural load-bearing and heat exchange functions, energy piles have been widely used in the field of construction engineering in recent years. However, with the increase in engineering application cases, the problems existing in the operation of energy piles have gradually emerged. Specifically, the settlement of the pile body is large. During the operation of energy piles, the cyclic thermal and cold loads not only affect the pile body (such as thermal expansion and contraction), but also affect the soil around the pile (such as changes in saturation and earth pressure). For bored energy piles, they are generally used in combination with the mud slurry support wall technology, so a mud cake will be formed between the pile and the soil. The mud cake is more sensitive to thermal and cold temperatures, forming a significant mud cake effect. The mud cake effect means that for the energy pile structure with a mud cake, affected by the cyclic thermal and cold, the strength of the mud cake between the pile and the soil will gradually decrease, affecting the side friction resistance of the pile body, and further causing the pile body to show a larger settlement. This phenomenon is more significant for friction piles. The drill bits and construction techniques in the prior art are difficult to weaken the mud cake effect, and the existence of the mud cake effect greatly reduces the stability of energy piles, posing certain potential safety hazards. Summary of the Invention

[0003] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title. However, such simplifications or omissions shall not be used to limit the scope of the present invention.

[0004] In view of the above and / or problems existing in the prior art of energy pile construction devices and construction methods for weakening the mud cake effect, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is that the drill bits and construction techniques in the prior art are difficult to weaken the mud cake effect, and the existence of the mud cake effect greatly reduces the stability of energy piles, posing certain potential safety hazards.

[0006] To solve the above technical problems, the present invention provides the following technical solution: An energy pile construction device for weakening the mud skin effect, which includes a drill bit assembly, including a shaft rod, a drill bit, an expansion member, a blasting member, a driving member, and a splicing member. The drill bit is fixed to the bottom end of the shaft rod. The expansion member is arranged on the surface of the drill bit. The blasting member is arranged on the shaft rod. The driving member is fixed to the top end of the shaft rod. The splicing member is arranged on the driving member; and a connection assembly arranged at the end of the shaft rod, including a first connection member, a second connection member, and a blocking member. The first connection member is arranged at the end of the shaft rod. The second connection member is arranged at the end of the shaft rod and is located on one side of the first connection member. The blocking member is arranged in the second connection member.

[0007] As a preferred scheme of the energy pile construction device for weakening the mud skin effect of the present invention, wherein: The expansion member includes an expansion plate, a hinge block, and a guide block. The expansion plate is hinged to the surface of the drill bit through the hinge block. The guide block is fixed to the drill bit. A rectangular hole is opened on the expansion plate. The guide block slides in the rectangular hole.

[0008] As a preferred scheme of the energy pile construction device for weakening the mud skin effect of the present invention, wherein: The blasting member includes an airbag and a carbon dioxide blasting package. The airbag is fixed to the top and bottom of the shaft rod. The carbon dioxide blasting package is fixed to the surface of the shaft rod and is located between the two airbags. An air vent hole is opened in the shaft rod, which is communicated with the airbag.

[0009] As a preferred scheme of the energy pile construction device for weakening the mud skin effect of the present invention, wherein: The driving member includes a driving rod and a driving tooth. The driving rod is fixed to the top of the surface of the shaft rod. The driving tooth is fixed to the end of the driving rod.

[0010] As a preferred scheme of the energy pile construction device for weakening the mud skin effect of the present invention, wherein: The splicing member includes a fixing plate, a movable plate, a convex block, a first spring, and a fixing column. The fixing plate is fixed to the driving rod, and a groove is opened at its top. The movable plate slides on both sides of the inner wall of the groove. The convex block is fixed to the end of the movable plate. The two ends of the first spring are respectively fixed to the groove and the convex block. The fixing column is fixed to the bottom of the surface of the shaft rod and cooperates with the movable plate.

[0011] As a preferred scheme of the energy pile construction device for weakening the mud skin effect of the present invention, wherein: The first connection member includes a first fixed pipe, a second fixed pipe, and a sealing ring. The first fixed pipe is fixed to the top end of the shaft rod. The second fixed pipe is fixed to the bottom end of the shaft rod. The sealing ring is fixed to the top end of the first fixed pipe. A grouting hole is opened in the middle of the shaft rod.

[0012] As a preferred embodiment of the energy pile construction device for weakening the mud cake effect according to the present invention, wherein: the second connecting member includes a connecting pipe and a mounting pipe. The connecting pipe is fixed to the top end of the shaft rod and is located outside the ventilation hole. The mounting pipe is fixed to the bottom end of the shaft rod and cooperates with the connecting pipe.

[0013] As a preferred embodiment of the energy pile construction device for weakening the mud cake effect according to the present invention, wherein: the blocking member includes a fixed shaft, a first sealing plate, a second sealing plate and a top rod. The fixed shaft is rotatably connected inside the mounting pipe. The first sealing plate is fixed to the fixed shaft. The second sealing plate is rotatably connected to the fixed shaft. The top rod is fixed to both sides of the top end of the connecting pipe.

[0014] As a preferred embodiment of the energy pile construction device for weakening the mud cake effect according to the present invention, wherein: the blocking member further includes a first limiting block, a second limiting block, a baffle and a second spring. The first limiting block and the second limiting block are respectively fixed to the fixed shaft and the second sealing plate. The baffle is fixed to the surface of the mounting pipe. Both ends of the second spring are fixed to the baffle and the limiting block respectively.

[0015] As a preferred embodiment of the construction method of the energy pile construction device for weakening the mud cake effect according to the present invention, wherein: positioning design;

[0016] Drilling operation with a drill bit;

[0017] Inject mud and extend the shaft rod;

[0018] Inject cement slurry and lift the drill bit upward;

[0019] Inflate the airbag and detonate the carbon dioxide blasting package;

[0020] Deflate the airbag and repeat injecting cement slurry while lifting the drill bit upward synchronously.

[0021] The beneficial effects of the present invention are as follows: By setting the drill bit assembly, the mud cake is removed during the process of lifting the drill bit upward, and at the same time, the friction of the energy pile can be increased. And by setting the connecting assembly, the sealing performance of the hole inside the shaft rod is improved, avoiding excessive impurities from entering the shaft rod and affecting its subsequent use. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings. Among them:

[0023] Figure 1 Overall structure diagram of an energy pile construction device for weakening the mud skin effect.

[0024] Figure 2 Structure diagram of the splicing parts of an energy pile construction device for weakening the mud skin effect.

[0025] Figure 3 Cross-sectional view of the drill bit of an energy pile construction device for weakening the mud skin effect.

[0026] Figure 4 Cross-sectional view of the expansion part of an energy pile construction device for weakening the mud skin effect.

[0027] Figure 5 Another perspective view of the shaft rod of an energy pile construction device for weakening the mud skin effect.

[0028] Figure 6 Cross-sectional view of the connection assembly of an energy pile construction device for weakening the mud skin effect.

[0029] Figure 7 Another perspective view of the plugging part of an energy pile construction device for weakening the mud skin effect. Detailed implementation manners

[0030] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following provides a detailed description of the specific implementation manners of the present invention in conjunction with the accompanying drawings of the specification.

[0031] Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0032] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that can be included in at least one implementation manner of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or alternative embodiments that exclude each other with other embodiments.

[0033] Embodiment 1

[0034] Referring to Figure 1 and Figure 2 , this is the first embodiment of the present invention. This embodiment provides an energy pile construction device for weakening the mud skin effect and its construction method. The energy pile construction device for weakening the mud skin effect and its construction method include a drill bit assembly 100 and a connection assembly 200. The energy pile is constructed through the drill bit assembly 100, and the convenience of using the drill bit assembly 100 is improved through the connection assembly 200.

[0035] Specifically, the drill bit assembly 100 includes a shaft rod 101, a drill bit 102, an expansion member 103, a blasting member 104, a driving member 105, and a splicing member 106. The drill bit 102 is fixed to the bottom end of the shaft rod 101. The expansion member 103 is disposed on the surface of the drill bit 102. The blasting member 104 is disposed on the shaft rod 101. The driving member 105 is fixed to the top end of the shaft rod 101. The splicing member 106 is disposed on the driving member 105.

[0036] The shaft rod 101 is set in a multi-section synthesis manner. The lowermost shaft rod 101 is fixed to the drill bit 102, and the upper shaft rods 101 can be sequentially connected and extended upward to facilitate long-distance drilling during the drilling process. The expansion member 103 is used to expand the inner wall of the pile hole when the drill bit 102 is lifted upward to scrape off the mud skin and eliminate the mud skin effect. The blasting member 104 can perform fixed-point blasting at various places in the pile hole to form an oval hole, thereby increasing the friction force after the formation of the energy pile and making it more stable. The driving member 105 is used to drive the shaft rod 101 and the drill bit 102 to perform drilling operations. The splicing member 106 is used to connect two adjacent shaft rods 101, making the disassembly and assembly more efficient and the connection more stable.

[0037] The connection assembly 200 is disposed at the end of the shaft rod 101 and includes a first connection member 201, a second connection member 202, and a plugging member 203. The first connection member 201 is disposed at the end of the shaft rod 101. The second connection member 202 is disposed at the end of the shaft rod 101 and is located on one side of the first connection member 201. The plugging member 203 is disposed in the second connection member 202.

[0038] The first connection member 201 is used to seal the hole between two adjacent shaft rods 101 to prevent side leakage when pouring cement slurry or mud. The second connection member 202 is used to seal the inflation hole of the blasting member 104 to prevent mud from entering its interior during use and affecting its inflation effect. Then, the hole is closed by the plugging member 203 to prevent excessive dust and impurities from entering the hole when the shaft rod 101 is in an idle state and affecting its subsequent use.

[0039] Embodiment 2

[0040] Refer to Figures 1 to 7 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment.

[0041] Specifically, the expansion member 103 includes an expansion plate 103a, a hinge block 103b, and a guide block 103c. The expansion plate 103a is hinged to the surface of the drill bit 102 through the hinge block 103b. The guide block 103c is fixed to the drill bit 102. A rectangular hole M is formed in the expansion plate 103a. The guide block 103c slides in the rectangular hole M.

[0042] The expansion plate 103a is divided into two parts. The first part is hinged to the side wall of the drill bit 102 through a hinge block 103b and is inclined. The second part is fixed to the top of the first part and is vertical. When the drill bit 102 is lifted upward and rotated, the expansion member 103 is pressed outward by the pressure from the inner side of the pile hole wall, so that the mud skin on the inner wall of the pile hole is scraped off during the process of the drill bit 102 moving upward and rotating, to eliminate the mud skin effect of the pile hole. And at least three expansion plates 103a are provided, which are evenly distributed in a ring on the surface of the drill bit 102. The guide block 103c and the rectangular hole M are used to limit the expansion plate 103a, preventing it from deviating too large an angle during the process of deviating outward and affecting the removal of the mud skin effect.

[0043] The blasting member 104 includes an airbag 104a and a carbon dioxide blasting package 104b. The airbag 104a is fixed to the top and bottom of the shaft rod 101, and the carbon dioxide blasting package 104b is fixed to the surface of the shaft rod 101 and is located between the two airbags 104a. An air vent V is opened in the shaft rod 101, which is communicated with the airbag 104a.

[0044] The material of the airbag 104a can withstand the impact force during the fixed-point blasting of carbon dioxide, avoiding the diffusion of the impact force to the top and bottom, so that a circular hole is micro-exploded in the soil area between the two airbags 104a, so that the friction between the energy pile and the soil is greater after pouring and forming, greatly improving its stability. A remote blasting mechanism is provided on the carbon dioxide blasting package 104b, which is an existing technology and will not be elaborated here. A plurality of them are provided and are evenly distributed in a ring on the surface of the shaft rod 101, so that a complete circle can be formed during blasting, and it is a micro-blast, which will not affect the strength of the shaft rod 101.

[0045] The air vent V is used to inflate the two airbags 104a. When inflation is required, only need to connect the air pipe to the air vent V at the top of the topmost shaft rod 101, greatly improving the convenience of inflation and deflation.

[0046] The driving member 105 includes a driving rod 105a and a driving tooth 105b. The driving rod 105a is fixed to the top of the surface of the shaft rod 101, and the driving tooth 105b is fixed to the end of the driving rod 105a.

[0047] A plurality of driving rods 105a are provided and are evenly distributed in a ring on the top of the surface of each shaft rod 101. The driving tooth 105b is fixed to the end of the driving rod 105a. The device can adopt three driving motors and be driven in a three-axis linkage manner to improve the convenience and stability of drilling. This is an existing mature technology and will not be elaborated here.

[0048] The splicing member 106 includes a fixing plate 106a, a movable plate 106b, a convex block 106c, a first spring 106d, and a fixing column 106e. The fixing plate 106a is fixed on the driving rod 105a, and a groove K is formed at the top thereof. The movable plate 106b slides on both sides of the inner wall of the groove K. The convex block 106c is fixed at the end of the movable plate 106b. Both ends of the first spring 106d are fixed to the groove K and the convex block 106c respectively. The fixing column 106e is fixed at the bottom of the surface of the shaft rod 101 and cooperates with the movable plate 106b.

[0049] The fixing plate 106a is fixed on each driving rod 105a. The movable plate 106b symmetrically slides on the inner wall of the groove K, and a limiting strip is fixed at the bottom thereof to limit the movable plate 106b to prevent it from shifting during the left - right movement. The convex block 106c is fixed at the ends of the two movable plates 106b, and the top thereof is chamfered. The first spring 106d applies a force to the convex block 106c and the movable plate 106b to move them inward into the groove K. The number of the fixing columns 106e is the same as that of the driving rods 105a. When two adjacent shaft rods 101 need to be spliced, the top shaft rod 101 is moved downward to the top of the bottom shaft rod 101, so that the fixing column 106e is correspondingly inserted into the groove K, and the movable plate 106b and the convex block 106c are pushed outward. When the fixing column 106e is completely located in the groove K, the two movable plates 106b are pushed to the top of the fixing column 106e by the first spring 106d to limit it, preventing the top shaft rod 101 from accidentally falling off during use, and at the same time enabling the bottom shaft rod 101 to rotate following the top shaft rod 101.

[0050] The first connecting member 201 includes a first fixing pipe 201a, a second fixing pipe 201b, and a sealing ring 201c. The first fixing pipe 201a is fixed at the top end of the shaft rod 101, the second fixing pipe 201b is fixed at the bottom end of the shaft rod 101, the sealing ring 201c is fixed at the top end of the first fixing pipe 201a, and a grouting hole S is formed in the middle of the shaft rod 101.

[0051] The diameter of the first fixing pipe 201a is smaller than that of the second fixing pipe 201b. When two adjacent shaft rods 101 are spliced, the bottom end of the second fixing pipe 201b is inserted into the top of the first fixing pipe 201a, and the contact position between the two is sealed by the sealing ring 201c to prevent leakage when grouting slurry or cement slurry into the grouting hole S. Moreover, the bottom end of the grouting hole S extends to both sides of the bottom of the drill bit 102, so that the cement slurry and the slurry can be directly poured from the bottom end of the drill bit 102. Compared with the existing side - pouring method, this method can greatly improve the drilling efficiency and stability of the drill bit 102.

[0052] The second connecting member 202 includes a connecting pipe 202a and an installation pipe 202b. The connecting pipe 202a is fixed to the top end of the shaft rod 101 and is located outside the ventilation hole V. The installation pipe 202b is fixed to the bottom end of the shaft rod 101 and cooperates with the connecting pipe 202a.

[0053] The diameter of the connecting pipe 202a is smaller than that of the installation pipe 202b. When the top shaft rod 101 is spliced on the top of the bottom shaft rod 101, the connecting pipe 202a will be inserted into the interior of the installation pipe 202b from the bottom end thereof. The ventilation hole V penetrates the shaft rod 101 and communicates with the two air bags 104a. When it is necessary to inflate the air bags 104a, the staff can connect an external air pipe to the connecting pipe 202a and prevent the gas inside the ventilation hole V from leaking through the seal between the connecting pipe 202a and the installation pipe 202b.

[0054] The blocking member 203 includes a fixed shaft 203a, a first sealing plate 203b, a second sealing plate 203c and a top rod 203d. The fixed shaft 203a is rotatably connected inside the installation pipe 202b. The first sealing plate 203b is fixed to the fixed shaft 203a. The second sealing plate 203c is rotatably connected to the fixed shaft 203a. The top rod 203d is fixed to both sides of the top end of the connecting pipe 202a.

[0055] The fixed shaft 203a is located in the middle of the installation pipe 202b, and its two ends extend to the outside of the installation pipe 202b. The first sealing plate 203b and the second sealing plate 203c combine to form a complete circle to seal the entire installation pipe 202b. The first sealing plate 203b is rotatably connected to the fixed shaft 203a, and the circular rings on both sides thereof also extend to both ends of the installation pipe 202b and are rotatably connected thereto through bearings, so that the two sealing plates can rotate upward or downward simultaneously. The top rod 203d is L-shaped. When the connecting pipe 202a is inserted into the installation pipe 202b, the two sealing plates are pushed upward by the top rod 203d to open the installation pipe 202b.

[0056] The blocking member 203 further includes a first limiting block 203e, a second limiting block 203f, a baffle plate 203g and a second spring 203h. The first limiting block 203e and the second limiting block 203f are respectively fixed to the fixed shaft 203a and the second sealing plate 203c. The baffle plate 203g is fixed to the surface of the installation pipe 202b. The two ends of the second spring 203h are respectively fixed to the baffle plate 203g and the limiting block.

[0057] The first limiting block 203e and the second limiting block 203f are arranged in a staggered manner. Through the arrangement of the baffle plate 203g, the two sealing plates can just close the installation pipe 202b when they are closed, preventing them from rotating downward too much and causing air leakage in the installation pipe 202b. Then, the two limiting blocks and the sealing plates are pulled by the second spring 203h to make it more convenient for them to reset.

[0058] During use, when drilling a hole, the driving mechanism drives the shaft rod 101 and the drill bit 102 to rotate and move into the pile hole. At this time, the expanding plate 103a is subjected to the pressure of the soil and moves towards the direction of the drill bit 102. After moving down a certain distance, it is necessary to extend the shaft rod 101. At this time, the extended bearing is installed downward on the bottom shaft rod 101, so that the fixing column 106e is correspondingly inserted into the groove K, and the movable plates 106b and the convex blocks 106c are pushed outward. When the fixing column 106e is completely located in the groove K, the two movable plates 106b are pushed to the top of the fixing column 106e by the first spring 106d to limit it and prevent the top shaft rod 101 from accidentally falling off during use. At the same time, the bottom shaft rod 101 can rotate following the top shaft rod 101. Meanwhile, the bottom end of the second fixed pipe 201b is inserted into the top of the first fixed pipe 201a, and the contact position between the two is sealed by the sealing ring 201c to prevent leakage when pouring mud or cement slurry into the grouting hole S. And the installation pipe 202b is correspondingly inserted into the top end of the connecting pipe 202a, and the two sealing plates are pushed upward by the ejector rod 203d to open the installation pipe 202b. After the drilling is completed, the device is parked at the designated position, and then the air vent V and the airbag 104a are inflated, so that the two airbags 104a are attached to the inner wall of the pile hole. Then, the carbon dioxide blasting package 104b is detonated through external control, so that a circular hole is formed on the inner wall of the pile hole, improving the pile side friction resistance, effectively improving the lateral friction resistance of the pile body, making its deformation small. Then, the drill bit 102 is lifted upward and rotated. At this time, the top of the expanding plate 103a is subjected to the pressure of the soil and expands outward, removing the mud skin on the inner wall of the pile hole, eliminating the mud skin effect, and effectively solving the influence of the mud skin between the pile and the soil on the lateral friction resistance of the pile body.

[0059] Example 3

[0060] Refer to Figures 1 to 7 , which is the third embodiment of the present invention, and this embodiment is based on the first two embodiments.

[0061] Specifically, positioning design; the staff locates and designs the position of the pile hole at the construction site through on-site surveys, etc., to provide guarantee for subsequent construction.

[0062] Then, drill a hole with the drill bit 102 according to the operation in the above embodiment.

[0063] During the drilling process, inject mud through the grouting hole S and lengthen the shaft rod 101 according to the actual length of the pile hole.

[0064] After the drilling is completed, inject cement slurry into the grouting hole S, and lift the drill bit 102 upward according to the operation of the above embodiment to eliminate the mud skin effect.

[0065] The airbag 104a is inflated and the carbon dioxide blasting package 104b is detonated to increase the skin friction of the pile, effectively improving the lateral skin friction of the pile shaft and minimizing its deformation.

[0066] Deflate the airbag 104a and repeat the above operation of injecting cement slurry while simultaneously lifting the drill bit 102 upward to complete the construction.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered within the scope of the claims of the present invention.

Claims

1. An energy pile construction device for weakening the mud cake effect, characterized in that: comprising, a drill bit assembly (100), including a shaft rod (101), a drill bit (102), an expansion member (103), a blasting member (104), a driving member (105) and a splicing member (106), the shaft rod (101) is arranged in a multi-section synthesis manner, the lowermost shaft rod (101) is fixed to the drill bit (102), and the upper shaft rods (101) are sequentially connected and extended upward, the expansion member (103) is arranged on the surface of the drill bit (102), the blasting member (104) is arranged on the shaft rod (101), the driving member (105) is fixed to the top of the shaft rod (101), and the splicing member (106) is arranged on the driving member (105); and, a connection assembly (200), arranged at the end of the shaft rod (101), including a first connection member (201), a second connection member (202) and a plugging member (203), the first connection member (201) is arranged at the end of the shaft rod (101), the second connection member (202) is arranged at the end of the shaft rod (101) and is located on one side of the first connection member (201), the plugging member (203) is arranged in the second connection member (202), the blasting member (104) includes an airbag (104a) and a carbon dioxide blasting package (104b), and a ventilation hole (V) is opened in the shaft rod (101), which is communicated with the airbag (104a); the first connection member (201) includes a first fixing pipe (201a), a second fixing pipe (201b) and a sealing ring (201c), the first fixing pipe (201a) is fixed to the top of the shaft rod (101), the second fixing pipe (201b) is fixed to the bottom of the shaft rod (101), the sealing ring (201c) is fixed to the top of the first fixing pipe (201a), and a grouting hole (S) is opened in the middle of the shaft rod (101); the second connection member (202) includes a connecting pipe (202a) and an installation pipe (202b), the connecting pipe (202a) is fixed to the top of the shaft rod (101) and is located outside the ventilation hole (V), and the installation pipe (202b) is fixed to the bottom of the shaft rod (101) and cooperates with the connecting pipe (202a).

2. The energy pile construction device for weakening the mud cake effect according to claim 1, characterized in that: the expansion member (103) includes an expansion plate (103a), a hinge block (103b) and a guide block (103c), the expansion plate (103a) is hinged to the surface of the drill bit (102) through the hinge block (103b), the guide block (103c) is fixed to the drill bit (102), a rectangular hole (M) is opened in the expansion plate (103a), and the guide block (103c) slides in the rectangular hole (M).

3. The energy pile construction device for weakening the mud cake effect according to claim 1 or 2, characterized in that: The air bags (104a) are fixed to the top and bottom of the shaft rod (101), and the carbon dioxide blasting packages (104b) are fixed to the surface of the shaft rod (101) and are located between the two air bags (104a).

4. The energy pile construction device for weakening the mud cake effect according to claim 3, characterized in that: The driving member (105) includes a driving rod (105a) and a driving tooth (105b). The driving rod (105a) is fixed to the top of the surface of the shaft rod (101), and the driving tooth (105b) is fixed to the end of the driving rod (105a).

5. The energy pile construction device for weakening the mud cake effect according to claim 4, characterized in that: The splicing member (106) includes a fixing plate (106a), a movable plate (106b), a convex block (106c), a first spring (106d) and a fixing column (106e). The fixing plate (106a) is fixed to the driving rod (105a), and a groove (K) is formed at the top thereof. The movable plate (106b) slides on both sides of the inner wall of the groove (K). The convex block (106c) is fixed to the end of the movable plate (106b). The two ends of the first spring (106d) are respectively fixed to the groove (K) and the convex block (106c). The fixing column (106e) is fixed to the bottom of the surface of the shaft rod (101) and cooperates with the movable plate (106b).

6. The energy pile construction device for weakening the mud cake effect according to claim 5, characterized in that: The blocking member (203) includes a fixing shaft (203a), a first sealing plate (203b), a second sealing plate (203c) and a top rod (203d). The fixing shaft (203a) is rotatably connected to the inside of the installation pipe (202b). The first sealing plate (203b) is fixed to the fixing shaft (203a). The second sealing plate (203c) is rotatably connected to the fixing shaft (203a). The top rod (203d) is fixed to both sides of the top end of the connecting pipe (202a).

7. The energy pile construction device for weakening the mud cake effect according to claim 6, characterized in that: The blocking member (203) further includes a first limiting block (203e), a second limiting block (203f), a baffle plate (203g) and a second spring (203h). The first limiting block (203e) and the second limiting block (203f) are respectively fixed to the fixing shaft (203a) and the second sealing plate (203c). The baffle plate (203g) is fixed to the surface of the installation pipe (202b). The two ends of the second spring (203h) are respectively fixed to the baffle plate (203g) and the limiting block.

8. The construction method of an energy pile construction device for weakening the mud cake effect, characterized in that: It includes the drill bit assembly (100) and the connection assembly (200) according to any one of claims 1-7, and further includes the following steps: Positioning design; Drilling operation with the drill bit (102); Injecting mud and lengthening the shaft rod (101); Inject cement slurry and lift the drill bit (102) upward; Inflate the airbag (104a) and detonate the carbon dioxide blasting package (104b); Deflate the airbag (104a) and repeat injecting cement slurry while synchronously lifting the drill bit (102) upward.

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