Construction method for treating sludge soft foundation through pile cap

Abstract

The invention discloses a pile cap treatment silt soft foundation construction method, which relates to the technical field of building construction, and comprises the following steps: S1, firstly determining the positions of a pile cap and a pile foundation; s2, drilling is conducted at the drilling position through a piling and drilling mechanism at the preset position, self-adjusting installation of a grouting mechanism at the drilling position is conducted, and the grouting mechanism and the piling and drilling mechanism are disassembled; s3, other grouting mechanisms are fixed to the piling and drilling mechanism, and the step S2 is repeated; s4, a plurality of main steel bars are inserted into the grouting mechanism, and grouting is conducted; and S5, after cement is solidified, the grouting mechanism is taken out, and the pile bearing platform is poured. According to the method, through cooperation of the grouting mechanism and the piling and drilling mechanism, during drilling, a grouting hollow rod gradually goes deep into a drill hole to form effective isolation on the silt soft foundation, so that the drying and forming speed of the pile foundation is increased, the pile foundation is formed by grouting the grouting hollow rod, and the pile bearing platform is formed. The drill holes can be effectively prevented from staggering and deviating due to the mobility of the soft foundation, and the straightness and perpendicularity of the drill holes are kept.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a construction method for a pile cap to treat a silt soft foundation. Background Art

[0002] In modern architecture and civil engineering, pile cap is a commonly used foundation reinforcement technology. It consists of a series of pile foundations and a concrete platform on top. The pile foundations are deep underground, while the concrete platform is located at or near the ground to support the load of the building to ensure the stability and durability of the building. Especially on soft soil foundations, pile caps can overcome the problem of insufficient bearing capacity of the foundation.

[0003] In the prior art, when constructing pile caps on silt soft foundations, the method of pouring concrete after drilling is generally adopted. However, after drilling holes on the soft foundation, due to the lack of effective support for the holes, the fluidity of the soft foundation will cause the drill holes to deviate, making it difficult to ensure the straightness and verticality of the holes, which will easily lead to interference with the fluidity and solidification process of the concrete during the pouring process, making it difficult to form the pile foundation, affecting the ultimate bearing capacity and durability. At the same time, due to the high moisture content of the soft foundation, the drying speed and forming speed of the poured pile foundation in the soft foundation are slow, which prolongs the construction period.

[0004] Therefore, it is necessary to provide a construction method for treating silt soft foundation with a pile cap to solve the technical problems raised in the above background technology. Summary of the invention

[0005] In view of the above problems, the present invention provides a construction method for a pile cap to treat a silt soft foundation. Through the cooperation of a grouting mechanism and a pile drilling mechanism, while drilling, grouting empty rods gradually penetrate into the borehole to form an effective isolation for the silt soft foundation, and can stabilize the shape of the borehole, thereby improving the drying conditions around the pile foundation, reducing the influence of moisture in the soft foundation on the drying process of the pile foundation, accelerating the drying and forming speed of the pile foundation, shortening the construction period, and after the grouting empty rods are disassembled from the positioning seat, the pile foundation is formed by grouting the grouting empty rods, which can effectively prevent the borehole from staggered deviation due to the fluidity of the soft foundation, maintain the straightness and verticality of the borehole, and thus ensure the bearing capacity of the pile cap.

[0006] To achieve the above object, the present invention provides the following technical solution: a construction method for treating silt soft foundation with a pile cap, comprising:

[0007] S1. First, carry out geological exploration based on the soft foundation to determine the location and specific parameters of the pile cap and pile foundation;

[0008] S2, drilling at the predetermined position by the pile drilling mechanism and self-adjusting the grouting mechanism at the drilling position, and disassembling the grouting mechanism and the pile drilling mechanism;

[0009] S3, fix other grouting mechanisms to the piling and drilling mechanisms, and repeat step S2;

[0010] S4, inserting a plurality of main steel bars into the borehole through each grouting mechanism, injecting grout into the borehole through the grouting mechanism, and then accelerating the curing of cement through the auxiliary curing device;

[0011] S5. After the cement solidifies, the grouting mechanism is taken out using the pile drilling mechanism, and finally the pile cap is poured on the pile foundation.

[0012] In a possible implementation, the piling and drilling mechanism can be rotatably arranged on a frame at an angle of 90°, and crawlers are arranged on both sides of the frame.

[0013] In a possible implementation, a limit frame is fixedly provided at one end of the frame, a circular through hole is provided on the limit frame, and a driving motor is provided at the bottom of the frame, and the driving motor can drive the movement of the chain.

[0014] In a possible implementation, the piling and drilling mechanism includes:

[0015] a telescopic frame rotatably disposed on the vehicle frame; and

[0016] The drilling assembly is movably arranged on the telescopic frame through the chain.

[0017] In a possible implementation, the drilling assembly includes:

[0018] A positioning seat, movably arranged on the telescopic frame through the chain; and

[0019] The hydraulic unit is fixedly arranged on the positioning seat, and a push rod is fixedly arranged on the output end of the hydraulic unit, and the push rod can be slidably arranged in the positioning seat.

[0020] In a possible implementation, the grouting mechanism is detachably provided on the piling and drilling mechanism close to one side of the limiting frame, and the grouting mechanism can be inserted into the circular through hole.

[0021] In a possible implementation, the grouting mechanism includes:

[0022] The positioning rod is hollow, one end of which is provided with a sleeve 2 for limited sliding movement, a plurality of flaps 3 are evenly and fixedly provided on the circumference of the sleeve 2, and a plurality of flaps 2 are evenly and fixedly provided on the circumference of the other end of the positioning rod, and a rotating rod is rotatably provided on the plurality of flaps 2;

[0023] The hollow grouting rod is hollow and movably arranged in the positioning rod. A sleeve 1 is fixedly arranged on the circumference of the hollow grouting rod. A plurality of flaps 1 are evenly fixedly arranged on the circumference of the sleeve 1. A support column is rotatably arranged on the plurality of flaps 1. A slide seat is hingedly arranged on the support column close to the rotating rod. The slide seat is movably arranged in the rotating rod; and

[0024] The reset adjustment component is hinged to the sleeve 1, the support column and the sleeve 2 respectively.

[0025] In a possible implementation, the hollow grouting rod near one end of the positioning seat is detachably connected to the positioning seat.

[0026] In a possible implementation, a guide groove is provided on the rotating rod, and the slide seat is movably provided in the guide groove.

[0027] In a possible implementation, the reset adjustment assembly includes telescopic rods hingedly set with the flap one, and the other ends of the telescopic rods are respectively hingedly set with connecting axis one and connecting axis two, the connecting axis one away from the telescopic rods is hingedly set with the support column, and the connecting axis two away from the telescopic rods is hingedly set with the flap three-phase.

[0028] Compared with the prior art, the present invention provides a construction method for treating silt soft foundation with a pile cap, which has the following beneficial effects:

[0029] 1. The present invention cooperates with the grouting mechanism and the pile drilling mechanism. While drilling, the grouting empty rod gradually penetrates into the borehole to form an effective isolation for the silt soft foundation, and can stabilize the shape of the borehole, thereby improving the drying conditions around the pile foundation, reducing the influence of moisture in the soft foundation on the drying process of the pile foundation, accelerating the drying and molding speed of the pile foundation, shortening the construction period, and after the grouting empty rod and the positioning seat are disassembled, the pile foundation is molded by grouting the grouting empty rod, which can effectively prevent the borehole from staggered deviation due to the fluidity of the soft foundation, maintain the straightness and verticality of the borehole, thereby ensuring the bearing capacity of the pile cap.

[0030] 2. The present invention integrates drilling, hole support and pile foundation pouring into one process, thereby improving the overall construction efficiency, reducing the waiting time between processes, reducing material waste, and reducing the rework cost caused by quality problems.

[0031] 3. The present invention can quickly recover the grouting mechanism by fixing the grouting empty rod to the positioning seat and by rising the positioning seat to cooperate with the limiting of the circular hole through the hole, which is conducive to the process of recovering the grouting mechanism being combined with the construction process, reducing additional work steps, making the construction more flexible, and the use and recovery of the grouting mechanism can be adjusted in real time according to the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention.

[0033] Figure 1 It is a schematic diagram of the overall structure of a construction method for treating silt soft foundation with a pile cap;

[0034] Figure 2 It is a structural schematic diagram of a pile driving and drilling mechanism in a construction method for treating silt soft foundation with a pile cap;

[0035] Figure 3 A schematic diagram of the structure of a drilling assembly in a construction method for treating a soft foundation of silt with a pile cap;

[0036] Figure 4 It is a structural schematic diagram of a grouting mechanism in a construction method for treating silt soft foundation with a pile cap;

[0037] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0038] Figure 6 for Figure 4 A schematic diagram of the enlarged structure at B in the middle;

[0039] 1. Track; 2. Frame; 3. Pile drilling mechanism; 4. Grouting mechanism; 21. Limiting frame; 22. Driving motor; 23. Chain; 31. Telescopic frame; 32. Drilling assembly; 321. Positioning seat; 322. Hydraulic unit; 323. Push rod; 40. Positioning rod; 41. Grouting empty rod; 42. Sleeve one; 43. Flange one; 44. Support column; 45. Sliding seat; 46. Flange two; 47. Rotating rod; 48. Sleeve two; 49. Flange three; 410. Reset adjustment assembly; 471. Guide groove; 4101. Telescopic rod; 4102. Connecting shaft one; 4103. Connecting shaft two. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0042] See also Figure 1-Figure 6 The embodiment of the present invention provides a method for constructing a pile cap for treating a silt soft foundation, which comprises:

[0043] S1. First, carry out geological exploration based on the soft foundation to determine the location and specific parameters of the pile cap and pile foundation;

[0044] S2, drilling at the predetermined position by the pile drilling mechanism 3 and self-adjusting the grouting mechanism 4 at the drilling position, and disassembling the grouting mechanism 4 from the pile drilling mechanism 3;

[0045] S3, fix the other grouting mechanism 4 to the piling drilling mechanism 3, and repeat step S2;

[0046] S4, inserting a plurality of main steel bars into the borehole through each grouting mechanism 4, and injecting grout into the borehole through the grouting mechanism 4, and then accelerating the curing of cement through the auxiliary curing device;

[0047] S5. After the cement is solidified, the grouting mechanisms 4 are taken out by using the pile drilling mechanism 3, and finally the pile cap is poured on the pile foundation.

[0048] It should be noted that the natural water content of the silt soft foundation is usually very high. The drying and forming speed of the pile foundation after pouring in the soft foundation is slow, which can easily lead to an extension of the construction period. The porosity ratio of the silt soft foundation is usually greater than 1.0, and its structure is loose and the pore space is relatively large, which makes the density of the silt soft foundation low and the bearing capacity weak. Under the action of load, the stability of the silt soft foundation is poor, and the foundation will undergo large settlement deformation. In addition, the permeability coefficient of the silt soft foundation is low, which makes it difficult to effectively drain water during the construction process, increasing the difficulty of construction. After drilling holes in the silt soft foundation, the holes are easily staggered and deviated due to the fluidity of the soft foundation, making it difficult to form the pile foundation during the pouring process.

[0049] Through the above technical scheme, the grouting mechanism 4 can effectively isolate the silt soft foundation in the borehole, and can stabilize the shape of the borehole, thereby improving the drying conditions around the pile foundation, reducing the influence of moisture in the soft foundation on the drying process of the pile foundation, accelerating the drying and forming speed of the pile foundation, and ensuring the straightness and verticality of the borehole, thereby ensuring the bearing capacity of the pile cap, and integrating drilling, hole support and pile foundation pouring into one process, thereby improving the overall operation and construction efficiency, reducing the waiting time between processes, reducing material waste, and reducing the rework cost caused by quality problems.

[0050] In a possible embodiment, the piling drilling mechanism 3 can be rotatably arranged on the frame 2 at an angle of 90°, and tracks 1 are arranged on both sides of the frame 2. In the initial state, the piling drilling mechanism 3 is parallel to the ground. After the frame 2 travels to a predetermined position through the tracks 1, when drilling, the steering direction of the piling drilling mechanism 3 is adjusted so that the piling drilling mechanism 3 performs drilling operations perpendicular to the ground direction; after the drilling work is completed, the piling drilling mechanism 3 returns to a state parallel to the ground.

[0051] In a possible implementation, a limiting frame 21 is fixedly provided at one end of the frame 2 , a circular through hole is provided on the limiting frame 21 , and a driving motor 22 is provided at the bottom of the frame 2 , and the driving motor 22 can drive the movement of the chain 23 .

[0052] In a possible implementation, the piling and drilling mechanism 3 includes:

[0053] a telescopic frame 31 rotatably disposed on the vehicle frame 2; and

[0054] The drilling assembly 32 is movably arranged on the telescopic frame 31 via the chain 23 .

[0055] By adopting the above technical solution, when drilling, the telescopic frame 31 is rotated to be perpendicular to the ground, and the driving motor 22 is rotated to drive the drilling assembly 32 to be continuously lowered on the telescopic frame 31, and the distance between the drilling assembly 32 and the ground is adjusted to be continuously reduced; after the drilling work is completed, the driving motor 22 is rotated to drive the drilling assembly 32 to be continuously raised on the telescopic frame 31, and the drilling assembly 32 is away from the ground, and the telescopic frame 31 is rotated to restore to be parallel to the ground.

[0056] In a possible implementation, the drilling assembly 32 includes:

[0057] A positioning seat 321 is movably disposed on the telescopic frame 31 through the chain 23; and

[0058] The hydraulic unit 322 is fixedly disposed on the positioning seat 321 . A push rod 323 is fixedly disposed at the output end of the hydraulic unit 322 , and the push rod 323 is slidably disposed in the positioning seat 321 .

[0059] Based on the above technical solution, the hydraulic unit 322 starts to control the extension of the push rod 323, and as the drilling assembly 32 descends as a whole, drilling operations are performed on the silt soft foundation; when grouting, the hydraulic unit 322 starts to control the contraction of the push rod 323, and as the driving motor 22 drives the drilling assembly 32 to rise as a whole, the piling drilling mechanism 3 moves away from the borehole and returns to being parallel to the ground.

[0060] In a possible implementation manner, the grouting mechanism 4 is detachably provided on the pile drilling mechanism 3 near the side of the limit frame 21, and the grouting mechanism 4 can be inserted into the circular through hole. When performing grouting work, the grouting mechanism 4 is first disassembled from the pile drilling mechanism 3, the pile drilling mechanism 3 is away from the drilled hole and restored to be parallel to the ground, the frame 2 travels to other predetermined positions to be piled, and other grouting mechanisms 4 are fixed to the pile drilling mechanism 3, the above steps are repeated to drill holes and install the grouting mechanism 4, and then steel bars are inserted into each grouting mechanism 4 and grouting is performed. After the cement is solidified, the grouting mechanism 4 needs to be removed from When taking out from the borehole, the frame 2 travels to each predetermined position, the telescopic frame 31 rotates to be perpendicular to the ground, and the driving motor 22 rotates to drive the drilling assembly 32 to continuously lower on the telescopic frame 31, and adjusts the distance between the drilling assembly 32 and the ground to continuously reduce, and the grouting mechanism 4 and the pile drilling mechanism 3 are installed and fixed, and the driving motor 22 is started to drive the drilling assembly 32 to continuously rise on the telescopic frame 31, and finally the grouting mechanism 4 is recovered, which is conducive to combining the process of recovering the grouting mechanism 4 with the construction process, reducing additional work steps, making the construction more flexible, and the use and recovery of the grouting mechanism 4 can be adjusted in real time according to the construction progress.

[0061] In a possible implementation, the grouting mechanism 4 includes:

[0062] The positioning rod 40 is hollow, and a sleeve 2 48 is provided at one end thereof for limited sliding. A plurality of flaps 3 49 are evenly and fixedly provided on the circumference of the sleeve 2 48. A plurality of flaps 2 46 are evenly and fixedly provided on the other end of the positioning rod 40. A rotating rod 47 is rotatably provided on the plurality of flaps 2 46.

[0063] The hollow grouting rod 41 is hollow and movably arranged in the positioning rod 40. A sleeve 42 is fixedly arranged on the circumference of the hollow grouting rod 41. A plurality of flaps 43 are evenly fixedly arranged on the circumference of the sleeve 42. A support column 44 is rotatably arranged on the plurality of flaps 43. A slide 45 is hingedly arranged on the support column 44 near the rotating rod 47. The slide 45 is movably arranged in the rotating rod 47; and

[0064] The reset adjustment assembly 410 is hinged to the sleeve 1 42, the support column 44 and the sleeve 2 48 respectively.

[0065] Through the above technical solution, when the drilling operation is carried out, the driving motor 22 and the hydraulic unit 322 are started, the grouting empty rod 41 contacts the ground first, and when the top rod 323 moves downward perpendicularly to the ground, the top rod 323 drills a hole on the soft mud foundation, and the grouting empty rod 41 gradually penetrates into the borehole under the pressure of the positioning seat 321 and the vibration of the hydraulic unit 322, and the rotating rod 47 gradually contacts the ground and unfolds until each rotating rod 47 is completely in contact with the ground. As the grouting empty rod 41 descends, the support column 44 opens, and the slide seat 45 slides on the rotating rod 47. After the drilling work is completed, the grouting empty rod 41 It also gradually penetrates deeper into the borehole to form an effective isolation for the silt soft foundation. At the same time, the rotating rod 47 and the positioning rod 40 can form a stable support according to the silt soft foundation ground. On the one hand, it prevents the support function of the grouting hollow rod 41 alone, and the grouting hollow rod 41 is easy to move with the silt soft foundation. On the other hand, it prevents the verticality of the pile foundation from being reduced after grouting the grouting hollow rod 41. Under the joint action of the grouting hollow rod 41 and the positioning rod 40, the shape of the borehole can be stabilized, thereby improving the drying conditions around the pile foundation, reducing the influence of moisture in the soft foundation on the drying process of the pile foundation, accelerating the drying and forming speed of the pile foundation, and shortening the construction period.

[0066] In a possible embodiment, the grouting hollow rod 41 near one end of the positioning seat 321 is detachably connected to the positioning seat 321. During the grouting work, after the grouting hollow rod 41 and the positioning seat 321 are disassembled, the pile foundation is formed by grouting the grouting hollow rod 41, which can effectively prevent the drilling hole from staggered deviation due to the fluidity of the soft foundation, maintain the straightness and verticality of the drilling hole, thereby ensuring the bearing capacity of the pile cap, and then accelerate the solidification of the cement through the auxiliary solidification device. After the cement is solidified, the telescopic frame 31 is rotated to be perpendicular to the ground direction, the positioning seat 321 and the grouting hollow rod 41 are fixed, the drive motor 22 is started to drive the positioning seat 321 to continuously rise on the telescopic frame 31, and the support column 44 is retracted through the circular through hole. When the positioning seat 321 rises to a fixed position, the telescopic frame 31 is rotated to be parallel to the ground direction to complete the recovery work of the grouting mechanism 4.

[0067] In a possible implementation manner, a guide groove 471 is provided on the rotating rod 47 , and the slide seat 45 is movably provided in the guide groove 471 , and the slide seat 45 can reciprocate along the guide groove 471 .

[0068] In a possible embodiment, the reset adjustment component 410 includes a telescopic rod 4101 which is hinged to the flap 1 43, and the other ends of the telescopic rod 4101 are respectively hinged with a connecting shaft 1 4102 and a connecting shaft 2 4103, the connecting shaft 1 4102 away from the telescopic rod 4101 is hinged to the support column 44, and the connecting shaft 2 4103 away from the telescopic rod 4101 is hinged to the flap 3 49. When drilling, the support column 44 is not restricted by the circular hole, so that the rotating rod 47 and the support column 44 are both opened by the reset adjustment component 410. When the grouting mechanism 4 is recovered, as the grouting empty rod 41 rises, the support column 44 is restricted by the circular hole, so that the rotating rod 47 and the support column 44 are both contracted by the reset adjustment component 410, which is beneficial to the recovery of the grouting mechanism 4.

[0069] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for constructing a pile cap to treat a soft foundation of silt, characterized in that: The specific steps are as follows: S1. First, carry out geological exploration based on the soft foundation to determine the location and specific parameters of the pile cap and pile foundation; S2, drilling at the predetermined position by the pile-driving and drilling mechanism (3) and self-adjusting the grouting mechanism (4) at the drilling position, and disassembling the grouting mechanism (4) and the pile-driving and drilling mechanism (3); S3, fix the other grouting mechanism (4) to the pile drilling mechanism (3), and repeat step S2; S4, inserting a plurality of main steel bars into the borehole through each grouting mechanism (4), injecting grout into the borehole through the grouting mechanism (4), and then accelerating the solidification of cement through the auxiliary solidification device; S5. After the cement is solidified, the grouting mechanism (4) is taken out by using the pile drilling mechanism (3), and finally the pile cap is poured on the pile foundation.

2. A pile cap treatment silt soft foundation construction method according to claim 1, characterized in that: The pile-driving and drilling mechanism (3) can be rotatably arranged on the vehicle frame (2) at an angle of 90°, and crawlers (1) are arranged on both sides of the vehicle frame (2).

3. A pile cap treatment silt soft foundation construction method according to claim 2, characterized in that: A limiting frame (21) is fixedly arranged at one end of the frame (2), a circular through hole is provided on the limiting frame (21), and a driving motor (22) is arranged at the bottom of the frame (2), and the driving motor (22) can drive the movement of the chain (23).

4. A pile cap treatment silt soft foundation construction method according to claim 3, characterized in that: The pile driving and drilling mechanism (3) comprises: a telescopic frame (31) rotatably arranged on the vehicle frame (2); and The drilling assembly (32) is movably arranged on the telescopic frame (31) via the chain (23).

5. A pile cap construction method for treating silt soft foundation according to claim 4, characterized in that: The drilling assembly (32) comprises: A positioning seat (321) is movably arranged on the telescopic frame (31) via the chain (23); and The hydraulic unit (322) is fixedly arranged on the positioning seat (321); a push rod (323) is fixedly arranged at the output end of the hydraulic unit (322), and the push rod (323) is slidably arranged in the positioning seat (321).

6. A pile cap construction method for treating silt soft foundation according to claim 3, characterized in that: The grouting mechanism (4) is detachably provided on the pile-driving and drilling mechanism (3) on one side close to the limiting frame (21), and the grouting mechanism (4) can be inserted into the circular through hole.

7. A pile cap construction method for treating silt soft foundation according to claim 6, characterized in that: The grouting mechanism (4) comprises: The positioning rod (40) is hollow, and one end of the positioning rod (40) is provided with a sleeve (48) for limiting sliding. A plurality of flaps (49) are evenly and fixedly provided on the circumference of the sleeve (48). A plurality of flaps (46) are evenly and fixedly provided on the circumference of the other end of the positioning rod (40). A rotating rod (47) is rotatably provided on the plurality of flaps (46). The hollow grouting rod (41) is hollow and movably arranged in the positioning rod (40); a sleeve (42) is fixedly arranged on the circumference of the hollow grouting rod (41); a plurality of flaps (43) are evenly fixedly arranged on the circumference of the sleeve (42); a support column (44) is rotatably arranged on each of the plurality of flaps (43); a slide seat (45) is hingedly arranged on the support column (44) near the rotating rod (47); and the slide seat (45) is movably arranged in the rotating rod (47); and The reset adjustment assembly (410) is hingedly connected to the sleeve 1 (42), the support column (44) and the sleeve 2 (48) respectively.

8. A pile cap construction method for treating silt soft foundation according to any one of claims 5 and 6, characterized in that: The hollow grouting rod (41) near one end of the positioning seat (321) is detachably connected to the positioning seat (321).

9. A pile cap construction method for treating silt soft foundation according to claim 7, characterized in that: The rotating rod (47) is provided with a guide groove (471), and the slide seat (45) is movably arranged in the guide groove (471).

10. A pile cap construction method for treating silt soft foundation according to claim 8, characterized in that: The reset adjustment component (410) includes a telescopic rod (4101) hingedly set to the flap one (43), and the other end of the telescopic rod (4101) is hingedly set with a connecting axis one (4102) and a connecting axis two (4103), respectively, the connecting axis one (4102) away from the telescopic rod (4101) is hingedly set to the support column (44), and the connecting axis two (4103) away from the telescopic rod (4101) is hingedly set to the flap three (49).

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