A slurry supply structure for rotary drilling in soft soil foundation and its construction technology

Abstract

The present invention provides a slurry supply structure for rotary drilling in soft soil foundations, which is used for supplying slurry for rotary drilling in soft soil foundations. It includes a steel casing and a slurry pit. Among them, the steel casing is provided with grouting holes and is placed in the soft soil foundation; the slurry pit is filled with slurry and is placed in the soft soil foundation; it also includes a grouting mechanism and a reinforcement mechanism. Among them, the grouting mechanism is arranged on the slurry pit and is used to supply the slurry in the slurry pit into the grouting holes and connect the steel casing and the slurry pit; the reinforcement mechanism is arranged on the slurry pit and is used for the reinforcement of the slurry pit. Through the grouting mechanism, the steel casing and the slurry pit can be fixed, and then the reinforcement mechanism is used to reinforce the slurry pit, so that while the steel casing can be supplied with slurry, the integration of the steel casing and the slurry pit is realized, so that it is not easy to shift and tilt in the soft soil foundation, and the precision of rotary drilling can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of rotary drilling and hole forming, and in particular to a mud supply structure and a construction process for rotary drilling and hole forming in a soft soil foundation. Background Art

[0002] Rotary drilling is carried out under the condition of mud wall protection. The rotary drilling rig uses the cutting tools on the bottom and side opening of the drill bucket to cut the rock and soil. At the same time, the cut rock and soil enter the drill bucket from the opening. After the drill bucket is filled with drill cuttings, the drill bit is lifted to the hole mouth through the telescopic drill rod, the bottom is automatically opened and the soil is unloaded, and then the drill bucket is lowered to the bottom of the hole to continue drilling. During the drilling process, the rotary drilling rig needs to inject grout into the hole to maintain the pressure balance inside and outside the hole to prevent collapse.

[0003] In addition, when the rotary drilling rig works in a soft soil foundation, such as a farmland or riverside with a soft surface, there is loose soil and silt. Most of the existing rotary drilling hole-making processes support the hole outlet with a steel retaining ring, so that it is convenient to put the drill bit into the hole to continue drilling. The steel retaining ring on the soft soil foundation is easy to loosen or shift, which will cause the direction of the drilling to shift.

[0004] A Chinese patent with publication number CN109356530A discloses a work platform for a rotary drilling rig on a soft soil foundation and a method of use. The platform consists of three parts: a cushion foundation, a clay embankment and a rigid roadbed. The rigid roadbed uses prefabricated assembled concrete components, which are connected into a whole using a PBL key-type double-hinged connecting plate. A built-in guide pipe is buried in the component, and angle steel is set to reinforce the edge of the component. The rigid roadbed is placed on the cushion foundation, and a clay embankment is set around it to form a temporary mud storage area with the rigid roadbed. The rigid roadbed effectively distributes the weight of the rotary drilling rig to the soft foundation, so that the bottom stress meets the bearing capacity requirements of the soft stratum. The built-in guide pipe and the temporary mud pool constitute a mud circulation system.

[0005] As for the technical solution mentioned above, the inventors found that the fundamental reason is that the rotary drilling rig is placed on a working platform and used for a long time on a soft foundation, which can easily cause the working platform to shift to one side of the rotary drilling rig, thereby causing the steel guard ring or the drilling position to shift, and ultimately causing the hole to shift and the hole-making accuracy to be low. In order to solve the above technical problems, it is necessary to provide a mud supply structure and construction process for rotary drilling on soft soil foundations. Summary of the invention

[0006] In view of this, the present invention proposes a mud supply structure and a construction process for rotary drilling of holes in soft soil foundations, which can be used on soft soil foundations and can combine the mud pool with the steel guard ring. After the mud pool and the steel guard ring are combined, the overall stability is higher and less likely to shift, thereby ensuring that the steel guard ring will not shift and improving the hole drilling accuracy.

[0007] The technical solution of the present invention is achieved in this way:

[0008] The first aspect of the present invention provides a slurry supply structure for rotary drilling of soft soil foundation, which is used for supplying slurry for rotary drilling of soft soil foundation, and comprises a steel retaining ring and a slurry pool, wherein:

[0009] The steel retaining ring is provided with grouting holes and is placed in the soft soil foundation;

[0010] The mud pit is filled with mud and placed in a soft soil foundation;

[0011] It also includes a grouting mechanism and a reinforcement mechanism, wherein:

[0012] The grouting mechanism is arranged on the mud pool, and is used to supply the mud in the mud pool to the grouting hole, and connect the steel retaining ring and the mud pool;

[0013] The reinforcement mechanism is arranged on the mud pool and is used for reinforcing the mud pool.

[0014] On the basis of the above technical solution, preferably, the reinforcement mechanism includes a rotating rod, a driving member, a first connecting member, a reinforcement plate and a second connecting member, wherein:

[0015] The rotating rod is rotatably arranged on the mud pool, and one end of the rotating rod extends into the mud pool;

[0016] The driving member is arranged in the mud pool, and its output end is fixed to the end of the rotating rod;

[0017] The first connecting piece is fixed to an end of the rotating rod away from the mud pool;

[0018] The reinforcement plate is fixed to the mud pool;

[0019] The second connecting member is fixed on the reinforcing plate and is selectively connected to the first connecting member.

[0020] On the basis of the above technical solution, preferably, the first connecting member includes a cylinder and a limit pile, wherein:

[0021] The cylinder is fixed to the end of the rotating rod;

[0022] The limit pile is fixed on the outer circumferential wall of the cylinder.

[0023] On the basis of the above technical solution, preferably, the second connecting member includes a cylinder, the cylinder is fixed on the reinforcement plate, a limiting groove is provided in the cylinder, the limiting groove is an "L"-shaped groove, and is adapted to the limiting pile.

[0024] On the basis of the above technical solution, preferably, the reinforcement plate adopts an arc structure, and there is a gap between the reinforcement plate and the mud pool.

[0025] On the basis of the above technical solution, preferably, the steel guard ring includes a cylinder and a guard ring, wherein the guard ring is fixed on the outside of the cylinder, and the grouting hole is arranged on the guard ring and communicated with the inner wall of the cylinder.

[0026] On the basis of the above technical solution, preferably, the grouting mechanism includes a mounting plate, a grouting plate, an extension arc plate and a grouting pile, wherein:

[0027] The mounting plate is fixed to the mud pool;

[0028] The grouting plate is rotatably arranged on the mounting plate and is connected with the mud pool;

[0029] The extended arc plate is fixed on the grouting plate, communicated with the grouting plate, and selectively abuts against the protective ring;

[0030] The grouting piles are fixed on the grouting plate and the extended arc plate, and are used to be inserted into the grouting holes and communicated with them.

[0031] On the basis of the above technical solution, preferably, the grouting mechanism further includes a power assembly, and the power assembly includes a driving pump, a slurry inlet pipe and a connecting hose, wherein:

[0032] The driving pump is fixed on the inner wall of the mud pool;

[0033] The slurry inlet pipe is fixed to the input end of the driving pump;

[0034] The connecting hose is fixed to the output end of the driving pump, and the other end of the connecting hose is communicated with the grouting plate.

[0035] On the basis of the above technical solution, preferably, it further comprises a fixing mechanism, wherein the fixing mechanism comprises a mounting seat, a fixing frame, a slide plate, a positioning column, a limit spring, a holding plate and an interference plate, wherein:

[0036] The mounting base is fixed to the protective ring;

[0037] The fixing frame is fixed on the mounting seat;

[0038] The slide plate is slidingly arranged in the fixed frame;

[0039] The positioning column is fixed in the fixed frame and passes through the slide plate, and the slide plate slides along the positioning column;

[0040] The limit spring is sleeved on the positioning column, one end of which is against the slide plate and the other end is against the fixed frame;

[0041] The abutment plate is hinged on the slide plate and selectively abuts against the extended arc plate;

[0042] The interference plate is fixed on the slide plate and is used for limiting the position of the supporting plate.

[0043] A second aspect of the present invention provides a construction process for rotary drilling a hole in a soft soil foundation using the above-mentioned slurry supply structure, the construction process comprising the following steps:

[0044] S1. Dig a placement groove for placing the steel retaining ring and the mud pool on the soft soil foundation, place the steel retaining ring and the mud pool in the placement groove, and backfill;

[0045] S2, rotating the grouting plate so that the grouting piles on the grouting plate and the extended arc plate are inserted into the grouting holes, and the grouting piles and the extended arc plate are supported on the protective ring;

[0046] S3, the rotary drilling rig is used to drill holes by positioning the steel retaining ring, and the mud in the mud pool is added to the hole by driving the pump, so that the internal and external pressures of the hole tend to be balanced;

[0047] S4. After the hole is drilled, the first connecting member and the second connecting member are separated by a driving member, and the reinforcement plate is left in the soft soil foundation. Finally, the steel retaining ring and the mud pool are taken out.

[0048] The slurry supply structure for rotary drilling of soft soil foundation of the present invention has the following beneficial effects compared with the prior art:

[0049] (1) The steel retaining ring and the mud pool can be fixed by the grouting mechanism, and then the mud pool can be reinforced by the reinforcement mechanism, so that the steel retaining ring can be supplied with slurry while realizing the integration of the steel retaining ring and the mud pool, so that it is not easy to deviate and tilt in the soft soil foundation, and the accuracy of rotary drilling can be improved;

[0050] (2) By fixing the protective ring on the outside of the cylinder, the contact area between the steel retaining ring and the foundation is increased, and it is convenient to connect with the grouting mechanism, and the stability of the steel retaining ring is better;

[0051] (3) The driving member drives the rotating rod to rotate, and the first connecting member rotates inside the second connecting member. After rotating a certain angle, the first connecting member will be separated from the second connecting member, so that the mud pool can be taken out and recycled for reuse, thereby leaving the reinforcement plate in the soft soil foundation. Since the reinforcement plate is made of degradable materials, it will not damage the soil environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1A three-dimensional diagram of a mud supply structure for rotary drilling of a hole in a soft soil foundation according to the present invention;

[0054] Figure 2 It is a front view of the mud supply structure for rotary drilling of holes in soft soil foundation of the present invention;

[0055] Figure 3 It is a right-side stereoscopic view of a mud supply structure for rotary drilling of a hole in a soft soil foundation according to the present invention;

[0056] Figure 4 It is a structural schematic diagram of a mud pool in a mud supply structure for rotary drilling of a hole in a soft soil foundation of the present invention;

[0057] Figure 5 The invention relates to a slurry supply structure for rotary drilling of a hole in a soft soil foundation. Figure 4 sectional view of

[0058] Figure 6 It is a structural schematic diagram of a reinforcement plate in a mud supply structure for rotary drilling of a hole in a soft soil foundation according to the present invention;

[0059] Figure 7 It is a schematic diagram of a first connecting member and a second connecting member in a mud supply structure for rotary drilling of a hole in a soft soil foundation according to the present invention;

[0060] Figure 8 It is a structural schematic diagram of a grouting mechanism in a slurry supply structure for rotary drilling of a hole in a soft soil foundation according to the present invention;

[0061] Fig. 9 It is a right side view of the grouting mechanism in the mud supply structure for rotary drilling of holes in soft soil foundation of the present invention;

[0062] Fig.10 A bottom view of a mud supply structure for rotary drilling of a hole in a soft soil foundation according to the present invention;

[0063] Fig.11 It is a structural schematic diagram of a grouting plate in a slurry supply structure for rotary drilling of a hole in a soft soil foundation according to the present invention;

[0064] Fig.12 It is a structural schematic diagram of a steel retaining ring in a mud supply structure for rotary drilling of a hole in a soft soil foundation according to the present invention;

[0065] Fig.13 It is a structural schematic diagram of a fixing mechanism in a mud supply structure for rotary drilling of a hole in a soft soil foundation according to the present invention;

[0066] Fig.14 It is an enlarged schematic diagram of point A of the mud supply structure for rotary drilling of a hole in a soft soil foundation of the present invention. DETAILED DESCRIPTION

[0067] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0068] like Figure 1-14 As shown, the mud supply structure for rotary drilling of soft soil foundation of the present invention is used for supplying mud for rotary drilling of soft soil foundation, and comprises a steel retaining ring 1 and a mud pool 2, wherein the steel retaining ring 1 is provided with a grouting hole 10 and is placed in the soft soil foundation; the mud pool 2 is filled with mud and is placed in the soft soil foundation; it also comprises a grouting mechanism 3 and a reinforcement mechanism 4, wherein the grouting mechanism 3 is provided on the mud pool 2, and is used to supply the mud in the mud pool 2 to the grouting hole 10, and connect the steel retaining ring 1 and the mud pool 2; the reinforcement mechanism 4 is provided on the mud pool 2, and is used to reinforce the mud pool 2.

[0069] The steel guard ring 1 and the mud pool 2 can be fixed by the grouting mechanism 3, and then the mud pool 2 can be reinforced by the reinforcement mechanism 4, so that the steel guard ring 1 can be supplied with slurry while realizing the integration of the steel guard ring 1 and the mud pool 2, so that it is not easy to deviate and tilt in the soft soil foundation, and the accuracy of rotary drilling can be improved.

[0070] As a preferred embodiment, the reinforcement mechanism 4 includes a rotating rod 41, a driving member 42, a first connecting member 43, a reinforcement plate 44 and a second connecting member 45, wherein the rotating rod 41 is rotatably arranged on the mud pool 2, and one end of the rotating rod 41 extends into the mud pool 2; the driving member 42 is arranged in the mud pool 2, and its output end is fixed to the end of the rotating rod 41; the first connecting member 43 is fixed to the end of the rotating rod 41 away from the mud pool 2; the reinforcement plate 44 is fixed on the mud pool 2; the second connecting member 45 is fixed on the reinforcement plate 44, and is selectively connected to the first connecting member 43.

[0071] Specifically, a bearing is provided on the mud pool 2, and the rotating rod 41 is rotatably set on the mud pool 2 through the bearing, and the rotating rod 41 is made of metal, so that the overall strength is higher and not easy to bend, and the driving member 42 can be a motor; specifically, the reinforcement plate 44 is made of degradable material, such as wooden boards. Wooden boards are not only easy to obtain and convenient to process, but also degradable, and there is no pollution to the soil.

[0072] The driving member 42 drives the rotating rod 41 to rotate. The first connecting member 43 rotates within the second connecting member 45. After rotating a certain angle, the first connecting member 43 will disengage from the second connecting member 45, so that the slurry pit 2 can be taken out and recycled. Thus, the reinforcement plate 44 is left in the soft soil foundation. Since the reinforcement plate 44 is made of degradable material, it will not damage the soil environment.

[0073] As a preferred embodiment, the first connecting member 43 includes a cylinder 431 and a limiting pile 432. Among them, the cylinder 431 is fixed at the end of the rotating rod 41; the limiting pile 432 is fixed on the outer circumferential wall of the cylinder 431.

[0074] As a preferred embodiment, the second connecting member 45 includes a cylinder 451. The cylinder 451 is fixed on the reinforcement plate 44. A limiting groove 452 is formed in the cylinder 451. The limiting groove 452 is an "L"-shaped groove and is adapted to the limiting pile 432.

[0075] In order to enable the first connecting member 43 and the second connecting member 45 to disengage, during use, the cylinder 431 can enter the cylinder 451. Under the action of the limiting groove 452, after the limiting pile 432 moves into the limiting groove 452 and rotates, the first connecting member 43 and the second connecting member 45 can be fixed. When disassembling, just rotate the cylinder 431 in the opposite direction and then pull it out, and the cylinder 431 can disengage from the cylinder 451.

[0076] As a preferred embodiment, the reinforcement plate 44 adopts an arc structure, and there is a gap between the reinforcement plate 44 and the slurry pit 2.

[0077] In order to ensure that there is a sufficiently large gap between the bottom of the reinforcement plate 44 and the slurry pit 2, the reinforcement plate 44 adopts an arc structure, and the reinforcement plate 44 and the slurry pit 2 can fill more loose soil or silt, so as to ensure the stability of the slurry pit 2 and the soft foundation and prevent it from sliding easily.

[0078] As a preferred embodiment, the steel casing 1 includes a cylinder body 11 and a protective ring 12. Among them, the protective ring 12 is fixed on the outside of the cylinder body 11, and the grouting holes 10 are arranged on the protective ring 12 and communicate with the inner wall of the cylinder body 11.

[0079] Specifically, in order to ensure the stability of the cylinder body 11, by fixing the protective ring 12 on the outside of the cylinder body 11, the contact area between the steel casing 1 and the foundation is increased, and it is also convenient to connect with the grouting mechanism 3.

[0080] As a preferred embodiment, the grouting mechanism 3 includes a mounting plate 31, a grouting plate 32, an extension arc plate 33 and a grouting pile 34, wherein the mounting plate 31 is fixed on the mud pool 2; the grouting plate 32 is rotatably set on the mounting plate 31 and is connected to the mud pool 2; the extension arc plate 33 is fixed on the grouting plate 32, is connected to the grouting plate 32, and selectively abuts against the protective ring 12; the grouting pile 34 is fixed on the grouting plate 32 and the extension arc plate 33, and is used to be inserted into the grouting hole 10 and connected thereto.

[0081] Specifically, in order to fix the steel retaining ring 1 and the mud pool 2, a driving motor 36 is also provided on the mounting plate 31, and the driving motor 36 can drive the grouting plate 32 to rotate until the grouting pile 34 is inserted into the grouting hole 10, thereby realizing the communication between the steel retaining ring 1 and the mud pool 2, and grouting can be performed for the steel retaining ring 1;

[0082] Meanwhile, the number of the grouting holes 10 is four, and the number of the grouting piles 34 is the same as that of the grouting holes 10 and corresponds one to one.

[0083] As a preferred embodiment, the grouting mechanism 3 also includes a power assembly 35, which includes a driving pump 351, a slurry inlet pipe 352 and a connecting hose 353, wherein the driving pump 351 is fixed on the inner wall of the mud pool 2; the slurry inlet pipe 352 is fixed to the input end of the driving pump 351; the connecting hose 353 is fixed to the output end of the driving pump 351, and the other end of the connecting hose 353 is connected to the grouting plate 32.

[0084] In order to inject the mud in the mud pool 2 into the steel guard ring 1, the driving pump 351 can inject the mud in the mud pool 2 into the guard ring 12, and the mud pool 2 and the grouting plate 32 can be connected through the connecting hose 353 to facilitate grouting.

[0085] As a preferred embodiment, it also includes a fixing mechanism 5, which includes a mounting seat 51, a fixing frame 52, a slide plate 53, a positioning column 54, a limit spring 55, a support plate 56 and an interference plate 57, wherein the mounting seat 51 is fixed on the protective ring 12; the fixing frame 52 is fixed on the mounting seat 51; the slide plate 53 is slidably set in the fixing frame 52; the positioning column 54 is fixed in the fixing frame 52 and passes through the slide plate 53, and the slide plate 53 slides along the positioning column 54; the limit spring 55 is mounted on the positioning column 54, one end of which is supported on the slide plate 53, and the other end is supported on the fixing frame 52; the support plate 5 is hinged on the slide plate 53, and selectively supports on the extended arc plate 33; the interference plate 57 is fixed on the slide plate 53, and is used to limit the support plate 56.

[0086] Specifically, after the grouting piles 34 and the extended arc plate 33 are abutted against the protective ring 12, it is only necessary to lift the slide plate 53 upwards and rotate the abutting plate 56, so that the limit spring 55 is compressed. Under the action of the interference plate 57, the abutting plate 56 can be rotated to an angle parallel to the extended arc plate 33. After releasing the slide plate 53, under the push of the limit spring 55, the abutting plate 56 abuts against the extended arc plate 33, thereby achieving the fixation of the extended arc plate 33 and the steel guard ring 1.

[0087] A construction process for rotary drilling a hole in a soft soil foundation using the above-mentioned slurry supply structure, the construction process comprising the following steps:

[0088] S1. Dig a placement groove for placing the steel retaining ring 1 and the mud pool 2 on the soft soil foundation, place the steel retaining ring 1 and the mud pool 2 in the placement groove, and backfill;

[0089] S2, rotating the grouting plate 32, so that the grouting piles 34 on the grouting plate 32 and the extended arc plate 33 are inserted into the grouting hole 10, and the grouting piles 34 and the extended arc plate 33 are supported on the protective ring 12;

[0090] S3, the rotary drilling rig drills a hole by positioning the steel retaining ring 1, and replenishes the mud in the mud pool 2 into the hole by driving the pump 351, so that the internal and external pressures of the hole tend to be balanced;

[0091] S4. After the hole is drilled, the first connecting member 43 and the second connecting member 45 are separated by the driving member 42, and the reinforcing plate 44 is left in the soft soil foundation. Finally, the steel retaining ring 1 and the mud pool 2 are taken out.

[0092] The working principle of this embodiment is:

[0093] First, the steel retaining ring 1 and the mud pool 2 are designed to be split. A placement groove for placing the steel retaining ring 1 and the mud pool 2 is dug on the soft soil foundation. The steel retaining ring 1 and the mud pool 2 are placed in the placement groove and backfilled. The position between the steel retaining ring 1 and the mud pool 2 needs to be measured in advance to ensure that the grouting mechanism 3 can connect and fix the steel retaining ring 1 and the mud pool 2.

[0094] After the steel retaining ring 1 and the mud pool 2 are connected, not only can the steel retaining ring 1 be grouted, but also the steel retaining ring 1 and the mud pool 2 can be formed into a whole. The mud pool 2 is filled with mud. Under the action of the mud pool 2 itself, the steel retaining ring 1 is fixed to prevent the steel retaining ring 1 from tilting and deviating.

[0095] Next, the grouting plate 32 is rotated so that the grouting piles 34 on the grouting plate 32 and the extended arc plate 33 are inserted into the grouting hole 10, and the grouting piles 34 and the extended arc plate 33 are held against the protective ring 12. Since the inner cavities of the grouting plate 32 and the extended arc plate 33 are connected, the grout will be discharged from the grouting piles 34 into the grouting hole 10;

[0096] Then, the rotary drilling rig drills a hole by positioning the steel retaining ring 1, and replenishes the mud in the mud pool 2 into the hole by driving the pump 351, so that the internal and external pressures of the hole tend to be balanced, thereby preventing the hole from collapsing;

[0097] Finally, after the hole is drilled, the driving member 42 drives the rotating rod 41 to rotate, so that the first connecting member 43 and the second connecting member 45 are separated, and then the steel retaining ring 1 and the mud pool 2 can be directly taken out, and the reinforcement plate 44 is left in the soft soil foundation. Since the reinforcement plate 44 is made of degradable materials, it will not damage the soil environment;

[0098] In addition, when the grouting pile 34 and the extended arc plate 33 are abutted against the protective ring 12, the extended arc plate 33 and the protective ring 12 can be fixed by the fixing mechanism 5, so as to prevent the extended arc plate 33 and the protective ring 12 from being separated, and the steel retaining ring 1 and the mud pool 2 can be connected and fixed to form a whole;

[0099] It should be noted that, according to the actual soil environment of the operation, the reinforcement plate 44 and the mud pool 2 can be selectively disassembled and installed. When there is silt in the foundation, they can be installed as a whole, and the backfilled silt can automatically slide into the gap between the reinforcement plate 44 and the mud pool 2 and fill it, thereby fixing the mud pool 2. When the soil in the foundation cannot slide into the gap between the reinforcement plate 44 and the mud pool 2, it can be manually filled and disassembled for installation, so that it can be suitable for rotary drilling in different soil environments.

[0100] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mud supply structure for rotary drilling in soft soil foundation, which is used for supplying slurry for rotary drilling in soft soil foundation. It includes a steel casing (1) and a mud pit (2). Among them, The steel casing (1) is provided with a grouting hole (10) and is placed in the soft soil foundation; The mud pit (2) is filled with mud and is placed in the soft soil foundation; It is characterized in that: it further includes a grouting mechanism (3) and a reinforcement mechanism (4). Among them, The grouting mechanism (3) is arranged on the mud pit (2) and is used to supply the mud in the mud pit (2) into the grouting hole (10) and connect the steel casing (1) and the mud pit (2); The reinforcement mechanism (4) is arranged on the mud pit (2) and is used for the reinforcement of the mud pit (2); The reinforcement mechanism (4) includes a rotating rod (41), a driving part (42), a first connecting part (43), a reinforcement plate (44) and a second connecting part (45). Among them, The rotating rod (41) is rotatably arranged on the mud pit (2), and one end of the rotating rod (41) extends into the mud pit (2); The driving part (42) is arranged in the mud pit (2), and its output end is fixed to the end of the rotating rod (41); The first connecting part (43) is fixed to the end of the rotating rod (41) far from the mud pit (2); The reinforcement plate (44) is fixed to the mud pit (2); The second connecting part (45) is fixed to the reinforcement plate (44) and is selectively connected to the first connecting part (43).

2. The mud supply structure for rotary drilling in soft soil foundation according to claim 1, It is characterized in that: The first connecting part (43) includes a cylinder (431) and a limit pile (432). Among them, The cylinder (431) is fixed to the end of the rotating rod (41); The limit pile (432) is fixed on the outer circumferential wall of the cylinder (431).

3. The mud supply structure for rotary drilling in soft soil foundation according to claim 2, It is characterized in that: The second connecting part (45) includes a cylinder (451). The cylinder (451) is fixed to the reinforcement plate (44). A limit groove (452) is opened in the cylinder (451). The limit groove (452) is an "L"-shaped groove and is adapted to the limit pile (432).

4. The mud supply structure for rotary drilling in soft soil foundation according to claim 1, It is characterized in that: The reinforcement plate (44) adopts an arc structure, and there is a gap between the reinforcement plate (44) and the mud pit (2).

5. The mud supply structure for rotary drilling in soft soil foundation according to claim 1, It is characterized in that: The steel casing (1) includes a cylinder body (11) and a protection ring (12). Among them, the protection ring (12) is fixed on the outside of the cylinder body (11), and the grouting hole (10) is arranged on the protection ring (12) and is communicated with the inner wall of the cylinder body (11).

6. The mud supply structure for rotary drilling in soft soil foundation according to claim 5, It is characterized in that: The grouting mechanism (3) includes a mounting plate (31), a grouting plate (32), an extending arc plate (33) and a grouting pile (34). Among them, The mounting plate (31) is fixed to the mud pit (2); The grouting plate (32) is rotatably arranged on the mounting plate (31) and is communicated with the mud pit (2); The extension arc plate (33) is fixed on the grouting plate (32), communicates with the grouting plate (32), and selectively abuts against the protective ring (12); The grouting pile (34) is fixed on the grouting plate (32) and the extension arc plate (33) for inserting into the grouting hole (10) and communicating with it.

7. The mud supply structure for rotary drilling in soft soil foundation as described in claim 6, characterized in that: The grouting mechanism (3) further includes a power assembly (35), and the power assembly (35) includes a driving pump (351), a slurry inlet pipe (352) and a connecting hose (353), wherein, The driving pump (351) is fixed on the inner wall of the mud pool (2); The slurry inlet pipe (352) is fixed at the input end of the driving pump (351); The connecting hose (353) is fixed at the output end of the driving pump (351), and the other end of the connecting hose (353) communicates with the grouting plate (32).

8. The mud supply structure for rotary drilling in soft soil foundation as described in claim 6, characterized in that: It further includes a fixing mechanism (5), and the fixing mechanism (5) includes a mounting seat (51), a fixing frame (52), a sliding plate (53), a positioning column (54), a limiting spring (55), a abutting plate (56) and an interfering plate (57), wherein, The mounting seat (51) is fixed on the protective ring (12); The fixing frame (52) is fixed on the mounting seat (51); The sliding plate (53) is slidably arranged in the fixing frame (52); The positioning column (54) is fixed in the fixing frame (52) and penetrates through the sliding plate (53), and the sliding plate (53) slides along the positioning column (54); The limiting spring (55) is sleeved on the positioning column (54), one end abuts against the sliding plate (53), and the other end abuts against the fixing frame (52); The abutting plate (56) is hinged on the sliding plate (53) and selectively abuts against the extension arc plate (33); The interfering plate (57) is fixed on the sliding plate (53) for limiting the abutting plate (56).

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