Grouting type ground anchor force system for static sounding of soft soil bottom layer and using method of grouting type ground anchor force system

Abstract

The invention relates to the technical field of engineering geological survey, and discloses a grouting type ground anchor force system for static sounding of a soft soil bottom layer and a using method.The grouting type ground anchor force system comprises a casing pipe, a sleeve, a drill bit assembly and an anchoring assembly, and a plurality of grouting openings are formed in the peripheral side of the bottom of the casing pipe; the sleeve is placed in the casing pipe and fixed to the casing pipe, and the drill bit assembly is detachably connected with the casing pipe. The anchoring assembly is detachably connected with the casing pipe, a grouting channel is suitable for being placed in the space between the casing pipe and the sleeve, and the casing pipe is configured in the mode that the anchoring assembly is replaced after the casing pipe is drilled by the drill bit assembly. Through the grouting opening in the bottom of the sleeve and the grouting channel between the sleeve and the sleeve, grout can be accurately injected into a soft soil layer, the soil layer property of an anchoring area is directly improved, the problems that the soft soil strength is insufficient, and enough anchoring force cannot be provided are solved, and a solid bearing foundation is provided for an anchoring assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering geological survey, and in particular to a grouting type ground anchoring force system for static penetration of soft soil bottom layers and a use method thereof. Background Art

[0002] Static penetration testing refers to the use of a pressure device to press a probing rod with a probe head into the test soil layer. By measuring the penetration resistance of the soil through a measurement system, certain basic physical and mechanical properties of the soil can be determined, such as the deformation modulus of the soil, the allowable bearing capacity of the soil, etc. At present, static penetration testing technology has a relatively wide application in field test exploration, but there are also certain problems.

[0003] In actual engineering survey applications, some sites often have poor surface soil properties, such as soft soil. During static penetration testing, the ground cannot provide sufficient anchoring force, nor can it support the heavy penetration vehicle (which itself provides a considerable reaction force). As a result, the penetration depth often does not meet technical requirements, and detailed soil parameters cannot be accurately obtained. Therefore, it is necessary to develop a new ground anchoring force system suitable for static penetration testing in soft soil substrata to ensure that the ground anchor provides sufficient reaction force. Summary of the Invention

[0004] In view of this, the present invention provides a grouting type ground anchoring force system for static penetration of soft soil bottom layer and a method of use to solve the above-mentioned problems.

[0005] In a first aspect, the present invention provides a grouting type ground anchoring force system for static penetration testing of soft soil, comprising:

[0006] The casing has a plurality of grouting ports arranged around the bottom;

[0007] A sleeve, placed inside the sleeve and fixed to the sleeve;

[0008] a drill bit assembly detachably connected to the casing;

[0009] An anchoring assembly, detachably connected to the sleeve;

[0010] The space between the casing and the sleeve is suitable for placing a grouting channel, and the casing is configured to replace the anchor assembly after drilling by the drill bit assembly.

[0011] The grouting type ground anchoring force system realizes the drilling reinforcement and anchoring operation of soft soil strata through the coordinated cooperation of casing, sleeve, drill bit assembly and anchor assembly. The specific process is as follows:

[0012] During the drilling and grouting phase, the drill bit assembly and casing are detachably connected to form a drilling unit. During operation, the casing drives the drill bit assembly into the soft ground. The sleeve is fixed within the casing, providing structural support for drilling. The space between the two sleeves serves as a grouting channel. After drilling to the preset depth, slurry is transported through the grouting channel to the grouting port on the side of the casing bottom and injected into the soft ground, thereby strengthening and improving the soil in the target area and providing a stable foundation for subsequent anchoring.

[0013] Anchoring Phase: After drilling and grouting are complete, the drill bit assembly at the bottom of the casing is removed and replaced with the anchor assembly. The casing, carrying the anchor assembly, is lowered into the grout-reinforced soil. The structural coordination between the casing and the sleeve ensures the anchor assembly is precisely positioned. The action of the anchor assembly forms a secure connection with the grout-reinforced soil, achieving anchoring and providing reaction force support for static penetration.

[0014] The system can accurately inject slurry into soft soil layers through the grouting port at the bottom of the casing and the grouting channel between the casing and the sleeve, directly improving the soil properties in the anchoring area, solving the problem of insufficient soft soil strength and inability to provide sufficient anchoring force, and providing a solid bearing foundation for the anchoring components.

[0015] In one embodiment, the drill bit assembly includes a metal drill bit, a drill rod and a drill rod connecting ring. The metal drill bit is rotatably connected to the bottom of the casing through the drill bit connecting ring. The drill rod is inserted into the sleeve, and the bottom of the drill rod is fixed to the metal drill bit; the drill rod connecting ring is arranged at the top of the casing.

[0016] In the drill bit assembly, the metal drill bit is rotatably connected to the bottom of the casing via a drill bit connecting ring. The drill rod is inserted into the sleeve and fixed to the metal drill bit at the bottom. The drill rod connecting ring at the top of the casing is used to connect to the drill rod of the drilling rig. During operation, the drilling rig drives the drill rod to rotate via the drill rod connecting ring. The drill rod drives the metal drill bit fixed at the bottom to rotate synchronously, and the metal drill bit's cutting action penetrates the soft soil formation. At the same time, the casing sinks synchronously with the penetration of the metal drill bit. The sleeve serves as a guide structure for the drill rod, ensuring that the drill rod remains vertical during rotation and sinking to avoid deviation. When the drilling depth needs to be adjusted, the metal drill bit is driven downward by the downward movement of the drill rod until it reaches the preset position.

[0017] In an optional embodiment, the drill bit assembly includes:

[0018] A metal drill bit is rotatably connected to the bottom of the casing through a drill bit connecting ring;

[0019] A drill rod is inserted into the sleeve, and the bottom of the drill rod is fixed to the metal drill bit;

[0020] A drill pipe connecting ring is arranged on the top of the casing.

[0021] In an optional embodiment, the anchoring assembly includes:

[0022] a fixing block fixed inside the bottom of the casing;

[0023] A plurality of anchor frames, the upper ends of which are hinged to the bottom of the fixed block; the plurality of anchor frames are distributed in a ring shape;

[0024] An anchor head main rod is inserted into the sleeve;

[0025] A sliding block is provided between the plurality of anchor frames, and the sliding block is connected to the bottom of the anchor head main rod;

[0026] Wherein, when the sliding block moves upward, the anchor frame is forced to open.

[0027] In an optional embodiment, the anchoring assembly further comprises:

[0028] A connecting rod is inserted into the sleeve; the bottom of the connecting rod is fixed to the fixing block, and the anchor head main rod is inserted into the connecting rod;

[0029] The steel strand is passed through the connecting rod, and the bottom of the steel strand is connected to the anchor head main rod.

[0030] In an optional embodiment, the contact surface between the sliding block and the anchor frame is a slope.

[0031] In an optional embodiment, a slip-stop member is provided on the inner side of the anchor frame.

[0032] In an optional embodiment, a grouting stop valve is further included, which is arranged in the casing and located at the grouting port.

[0033] In a second aspect, the present invention further provides a method for using the grouting type ground anchoring force system for static penetration testing of soft soil, comprising the following steps:

[0034] The drill bit assembly is installed at the bottom of the casing, hoisted onto the surface of the soft soil layer to be tested, and a hole is drilled in the soft soil layer to be tested;

[0035] After reaching the predetermined soil layer depth, grouting is injected into the space between the casing and the sleeve. After the grouting is completed, the casing continues to move downward to prepare for grouting reinforcement of the soil layer at the next depth;

[0036] After the soil layer is reinforced by grouting, the casing is removed, the anchor assembly is replaced, and then the casing and the anchor assembly are placed in the drill hole, and anchoring is achieved by using the anchor assembly;

[0037] After the anchoring work is completed, the sleeve and the anchoring assembly are removed.

[0038] This method uses a layered process of "drilling-grouting-re-drilling-re-grouting" to precisely inject grout according to the characteristics of soft soil at different depths, forming a multi-layered reinforcement structure. This gradually increases the bearing capacity of the soil layer, addresses the overall strength deficiency of the soft soil, and provides a stable load-bearing foundation for the anchor components. The anchor components are anchored in the grout-reinforced soil layer, leveraging the high strength of the improved soil layer to ensure sufficient and stable anchoring force, providing a continuous reaction force for static penetration testing, avoiding test deviations caused by soft soil deformation, and ensuring test depth and data accuracy.

[0039] In an optional embodiment, the step of installing the drill bit assembly at the bottom of the casing, hoisting it onto the surface of the soft soil layer to be tested, and drilling the soft soil layer to be tested includes:

[0040] The top of the drill rod in the drill bit assembly is connected to an external drilling rig, and the metal drill bit is driven to rotate through the drill rod.

[0041] In an optional embodiment, after the soil layer grouting reinforcement is completed, the casing is removed, the anchor assembly is replaced, and then the casing and the anchor assembly are placed in the above-mentioned drilled hole. The anchoring step of using the anchor assembly includes:

[0042] Pull the steel strand, pull the anchor head main rod and the sliding block upward through the steel strand, and then push the anchor frame to open into an umbrella-shaped structure through the upward movement of the sliding block until the stroke reaches the preset angle, thereby achieving anchoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 This is a schematic diagram of the operation of a grouting type ground anchoring force system for static penetration testing of soft soil subsoil according to an embodiment of the present invention;

[0045] Figure 2 This is a schematic structural diagram of a drill bit assembly in a grouting-type ground anchoring force system for static penetration testing of soft soil substratum according to an embodiment of the present invention;

[0046] Figure 3 Schematic diagram of the structure of an anchoring assembly in a grouting type ground anchoring force system for static penetration testing of soft soil layers according to an embodiment of the present invention (closed);

[0047] Figure 4Schematic diagram of the structure of an anchoring assembly in a grouting-type ground anchoring force system for static penetration testing of soft soil subsoil according to an embodiment of the present invention (open);

[0048] Figure 5 The present invention is a bottom view of an anchoring assembly in a grouting-type ground anchoring force system for static penetration testing of soft soil substratum according to an embodiment of the present invention.

[0049] Description of reference numerals:

[0050] 1. Casing;

[0051] 2. Grouting port;

[0052] 3. Sleeve;

[0053] 4. Grouting channel;

[0054] 51. Metal drill bit; 52. Drill rod; 53. Drill bit connecting ring; 54. Drill rod connecting ring;

[0055] 61. Fixed block; 62. Anchor frame; 63. Anchor head main rod; 64. Sliding block; 65. Connecting rod; 66. Steel strand; 67. Anti-slip member; 68. Hinge;

[0056] 7. Slurry stop valve;

[0057] 8. High-pressure grouting pump. DETAILED DESCRIPTION

[0058] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments 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 those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0059] Static penetration testing refers to the use of a pressure device to press a probing rod with a probe head into the test soil layer. By measuring the penetration resistance of the soil through a measurement system, certain basic physical and mechanical properties of the soil can be determined, such as the deformation modulus of the soil, the allowable bearing capacity of the soil, etc. At present, static penetration testing technology has a relatively wide application in field test exploration, but there are also certain problems.

[0060] In actual engineering survey applications, some sites often have poor surface soil properties, such as soft soil. During static penetration testing, the ground cannot provide sufficient anchoring force, nor can it support the heavy penetration vehicle (which itself provides a considerable reaction force). As a result, the penetration depth often does not meet technical requirements, and detailed soil parameters cannot be accurately obtained. Therefore, it is necessary to develop a new ground anchoring force system suitable for static penetration testing in soft soil substrata to ensure that the ground anchor provides sufficient reaction force.

[0061] In view of this, the present embodiment provides a grouting type ground anchoring force system and a method of use for static penetration testing of soft soil bottom layers to solve the above-mentioned problems.

[0062] The following combination Figures 1 to 5 , describing embodiments of the present invention.

[0063] According to an embodiment of the present invention, on the one hand, a grouting type ground anchoring force system for static penetration of soft soil bottom is provided, comprising a casing 1, a sleeve 3, a drill bit assembly and an anchoring assembly, wherein a plurality of grouting ports 2 are provided on the circumferential side of the bottom of the casing 1; the sleeve 3 is placed inside the casing 1 and fixed to the casing 1, and the drill bit assembly is detachably connected to the casing 1; the anchoring assembly is detachably connected to the casing 1, wherein the space between the casing 1 and the sleeve 3 is suitable for placing a grouting channel 4, and the casing 1 is configured to replace the anchoring assembly after drilling by the drill bit assembly.

[0064] The grouting type ground anchoring force system realizes the drilling reinforcement and anchoring operation of the soft soil layer through the coordinated cooperation of the casing 1, the sleeve 3, the drill bit assembly and the anchor assembly. The specific process is as follows:

[0065] During the drilling and grouting phase, the drill bit assembly is removably connected to the casing 1 to form a drilling unit. During operation, the casing 1 drives the drill bit assembly into the soft ground. The sleeve 3 is fixed within the casing 1, providing structural support for drilling. The space between the casing 1 and the sleeve 3 serves as a grouting channel 4. After drilling to the preset depth, slurry is transported through the grouting channel 4 to the grouting port 2 on the bottom side of the casing 1 and injected into the soft ground. This reinforces and improves the soil in the target area, providing a stable foundation for subsequent anchoring.

[0066] Anchoring Phase: After drilling and grouting are complete, the drill bit assembly at the bottom of casing 1 is removed and replaced with the anchor assembly. Casing 1, carrying the anchor assembly, is lowered into the grout-reinforced soil. The structural coordination between casing 1 and sleeve 3 ensures the anchor assembly is precisely positioned. The action of the anchor assembly forms a secure connection with the grout-reinforced soil, achieving anchoring and providing reaction force support for static penetration.

[0067] The system can accurately inject slurry into the soft soil layer through the grouting port 2 at the bottom of the casing 1 and the grouting channel 4 between the casing 1 and the sleeve 3, directly improving the soil properties in the anchoring area, solving the problem of insufficient soft soil strength and inability to provide sufficient anchoring force, and providing a solid bearing foundation for the anchoring component.

[0068] In one embodiment, the drill bit assembly includes a metal drill bit 51, a drill rod 52 and a drill rod connecting ring 54. The metal drill bit 51 is rotatably connected to the bottom of the casing 1 through the drill bit connecting ring 53. The drill rod 52 is inserted into the sleeve 3, and the bottom of the drill rod 52 is fixed to the metal drill bit 51; the drill rod connecting ring 54 is arranged at the top of the casing 1.

[0069] In the drill bit assembly, the metal drill bit 51 is rotatably connected to the bottom of the casing 1 via a drill bit connecting ring 53. The drill rod 52 is inserted into the sleeve 3 and fixed to the metal drill bit 51 at the bottom. The drill rod connecting ring 54 at the top of the casing 1 is used to connect with the drill rod 52 of the drilling rig. During operation, the drilling rig drives the drill rod 52 to rotate via the drill rod connecting ring 54. The drill rod 52 drives the metal drill bit 51 fixed at the bottom to rotate synchronously, and the metal drill bit 51 penetrates the soft soil layer with the cutting action of the metal drill bit 51. At the same time, the casing 1 sinks synchronously with the penetration of the metal drill bit 51. The sleeve 3 serves as a guide structure for the drill rod 52, ensuring that the drill rod 52 remains vertical during the rotation and sinking process to avoid deviation. When the drilling depth needs to be adjusted, the metal drill bit 51 continues to drill downward by moving the drill rod 52 downward until it reaches the preset position.

[0070] In one embodiment, the anchoring assembly includes a fixed block 61, several anchor frames 62, an anchor head main rod 63 and a sliding block 64. The fixed block 61 is fixed inside the bottom of the casing 1; the upper end of the anchor frame 62 is hinged to the bottom of the fixed block 61 through a hinge 68; the several anchor frames 62 are distributed in a ring shape; the anchor head main rod 63 is passed through the inside of the sleeve 3; the sliding block 64 is arranged between the several anchor frames 62, and the sliding block 64 is connected to the bottom of the anchor head main rod 63; wherein, when the sliding block 64 moves upward, it forces the anchor frame 62 to open.

[0071] A fixed block 61 is fixed to the bottom of the casing 1, providing a mounting base for the anchor frames 62. Several anchor frames 62 are arranged in a ring, their upper ends hinged to the bottom of the fixed block 61, allowing them to rotate around the hinge point. Anchor rods 63 pass through the interior of the sleeve 3, their bottoms connected to sliding blocks 64 located between the anchor frames 62. When anchoring is required, the anchor rods 63 move upward, driving the sliding blocks 64 at the bottom to move upward simultaneously. The sliding blocks 64 squeeze the inner sides of the anchor frames 62, forcing the ring-shaped anchor frames 62 to expand outward around the hinge point, making close contact with the soft soil layer improved by grouting, thus forming an anchoring effect.

[0072] In this anchoring assembly, several anchor frames 62 are distributed in a ring shape. When opened, they can evenly act on the surrounding soft soil layer improved by grouting, increase the contact area, improve the stability of the anchoring force, provide sufficient reaction force for static probing, and solve the problem of insufficient anchoring force in the soft soil layer.

[0073] In one embodiment, the anchoring assembly also includes a connecting rod 65 and a steel strand 66. The connecting rod 65 is passed through the inside of the sleeve 3; the bottom of the connecting rod 65 is fixed to the fixed block 61, and the anchor head main rod 63 is passed through the connecting rod 65; the steel strand 66 is passed through the connecting rod 65, and the bottom of the steel strand 66 is connected to the anchor head main rod 63.

[0074] The connecting rod 65 is inserted into the sleeve 3, and its bottom is fixed to the fixed block 61. The anchor rod 63 is inserted into the connecting rod 65. The steel strand 66 is also inserted into the connecting rod 65 and its bottom is connected to the anchor rod 63. When anchoring is required, the steel strand 66 is pulled upward by an external mechanical device. The steel strand 66 drives the anchor rod 63 inserted into the connecting rod 65 to move upward, which in turn causes the sliding block 64 at the bottom of the anchor rod 63 to move upward, squeezing the anchor frame 62 to expand into a ring structure, tightly interlocking with the soft soil layer improved by grouting, thus forming an anchoring effect.

[0075] In one embodiment, the contact surface between the sliding block 64 and the anchor frame 62 is a sloped surface.

[0076] The contact surface between the sliding block 64 and the anchor frame 62 is designed as a slope. When the anchor head main rod 63 drives the sliding block 64 upward, the slope of the sliding block 64 contacts the inner side of the anchor frame 62, generating a compressive effect. Due to the inclined angle of the slope, the axial force of the upward movement of the sliding block 64 is converted by the slope into a radial force that pushes the anchor frames 62 outward. This causes the multiple anchor frames 62 distributed in a ring to rotate synchronously outward around the hinge point at the bottom of the fixed block 61 until they tightly adhere to the soft soil layer improved by grouting, forming a stable anchor.

[0077] In one embodiment, a slip-stop member 67 is provided inside the anchor bracket 62 .

[0078] The anti-slip member 67, located on the inside of the anchor frame 62, plays a key role in the upward movement of the sliding block 64, forcing the anchor frame 62 to open. When the slope of the sliding block 64 contacts the inside of the anchor frame 62 and pushes the anchor frame 62 outward to a preset angle, the anti-slip member 67 forms a mechanical engagement with the sliding block 64, preventing the sliding block 64 from moving downward due to soil reaction or its own gravity during the anchoring operation. This maintains the anchor frame 62 in its open state and ensures that the anchor frame 62 maintains close contact with the soft soil layer after grouting.

[0079] Specifically, the anti-slip member 67 can be embedded in the groove on the slope of the sliding block 64.

[0080] When recovery is required, the steel strand 66 is loosened, the anchor head main rod 63 and the sliding block 64 lose tension, and the casing 1 and the anchor assembly are pulled upward together. After the anchor frame 62 loses support, under the pressure of the soil layer, the anti-slip member 67 disengages from the groove on the slope of the sliding block 64, and the anchor frame 62 is retracted, completing the recovery action.

[0081] In one embodiment, the grouting type ground anchoring force system for static penetration testing of soft soil layers further includes a grouting stop valve 7 , which is disposed in the casing 1 and at the grouting port 2 .

[0082] The stop valve 7 is arranged in the casing 1 and located at the grouting port 2. Its core function is to control the communication state between the grouting channel 4 and the grouting port 2. When grouting is carried out, the high-pressure grouting pump 8 conveys the slurry through the grouting channel 4 between the casing 1 and the sleeve 3 to the stop valve 7. Under the action of high pressure, the slurry pushes open the stop valve 7 and is injected into the soft soil layer through the grouting port 2 to reinforce the soil layer in the target area. After grouting is completed, the stop valve 7 is closed under the action of its own reset force (such as spring elasticity) or external pressure.

[0083] According to another aspect of an embodiment of the present invention, there is provided a method for using a grouting type ground anchoring force system for static penetration testing of a soft soil bottom layer, comprising the following steps:

[0084] Install the drill bit assembly at the bottom of the casing 1, hoist it onto the surface of the soft soil layer to be tested, and drill a hole in the soft soil layer to be tested;

[0085] After reaching the predetermined soil layer depth, grouting is performed in the space between the casing 1 and the sleeve 3. After the grouting is completed, the grouting continues to move downward to prepare for grouting reinforcement of the soil layer at the next depth;

[0086] After the soil layer is reinforced by grouting, the casing 1 is removed, the anchor assembly is replaced, and then the casing 1 and the anchor assembly are placed in the above-mentioned drilled hole and anchored by the anchor assembly;

[0087] After the anchoring work is completed, the sleeve 1 and the anchoring assembly are removed.

[0088] This method realizes drilling, grouting reinforcement and anchoring operations in soft soil formations through the step-by-step operation of the drill bit assembly, casing 1, sleeve 3 and anchor assembly. The specific process is as follows:

[0089] During the drilling phase, the drill bit assembly is installed at the bottom of casing 1 and hoisted to the surface of the soft soil layer to be tested. The drilling action of the drill bit assembly drives casing 1 to form a hole in the soft soil layer. Sleeve 3 is fixed inside casing 1, providing structural support and ensuring stable drilling direction. During this phase, mechanical force drives the drill bit assembly to continuously penetrate the soil until the preset first grouting depth is reached.

[0090] Layered grouting reinforcement stage: After reaching the predetermined soil depth, grouting is injected into the soft soil layer surrounding the borehole through the space between casing 1 and sleeve 3 (grouting channel 4). The slurry is injected into the soil through grouting port 2 at the bottom of casing 1, where it solidifies with the soft soil to form a reinforcement layer. After grouting is completed, the casing 1 and drill bit assembly are driven downward, repeating the drilling and grouting steps until the full depth of the soil layer is grouted and reinforced, forming a multi-layered continuous reinforcement structure in the soft soil layer, providing a bearing foundation for anchoring.

[0091] Anchoring Stage: After grouting, remove the casing 1 and disassemble the drill bit assembly at the bottom, replacing it with the anchor assembly. Replace the casing 1, now equipped with the anchor assembly, into the grout-reinforced layer. By manipulating the anchor assembly (e.g., by moving the slider 64 upward to open the anchor frame 62), it securely engages the reinforced soil layer, forming a secure anchor and providing reaction force support for the static penetration test.

[0092] Recovery stage: After the anchoring work is completed, operate the anchoring components to release the anchoring state.

[0093] In one embodiment, the drill bit assembly is installed at the bottom of the casing 1 and hoisted onto the surface of the soft soil layer to be tested. The step of drilling a hole in the soft soil layer to be tested includes:

[0094] The top of the drill rod 52 in the drill bit assembly is connected to an external drilling rig, and the metal drill bit 51 is driven to rotate by the drill rod 52.

[0095] In the process of "installing the drill bit assembly at the bottom of the casing 1, hoisting it onto the surface of the soft soil layer to be tested, and drilling the soft soil layer to be tested", after the drill bit assembly and the casing 1 are assembled and hoisted into place, the top of the drill rod 52 in the drill bit assembly is connected to the external drilling rig. The external drilling rig provides a rotational driving force, which transmits the torque to the metal drill bit 51 fixed at its bottom through the drill rod 52, so that the metal drill bit 51 rotates synchronously with the drill rod 52. The rotating metal drill bit 51 produces a cutting effect on the soft soil layer, and at the same time, under the action of external pressure, drives the casing 1 to gradually penetrate the soil layer to form a borehole. The sleeve 3 inside the casing 1 provides guide support for the drill rod 52, ensuring that the rotation axis of the drill rod 52 and the metal drill bit 51 remains stable to avoid drilling deviation.

[0096] In one embodiment, after the soil layer is grouting reinforced, the casing 1 is removed, the anchor assembly is replaced, and then the casing 1 and the anchor assembly are placed in the above-mentioned drilled hole. The anchoring step using the anchor assembly includes:

[0097] Pull the steel strand 66, pull the anchor head main rod 63 and the sliding block 64 upward through the steel strand 66, and then push the anchor frame 62 to open into an umbrella-shaped structure through the upward movement of the sliding block 64 until the stroke reaches a preset angle, thereby achieving anchoring.

[0098] After the grouting reinforcement of the soil layer is completed, the casing 1 is removed and replaced with an anchor assembly, and the casing 1 and the anchor assembly are placed in the drill hole. At this time, the steel strand 66 in the anchor assembly is passed through the connecting rod 65, and its bottom is connected to the anchor head main rod 63. The steel strand 66 is pulled by an external mechanical device, and the steel strand 66 transmits the tension to the anchor head main rod 63, driving the anchor head main rod 63 to move upward along the inside of the connecting rod 65, thereby prompting the sliding block 64 at the bottom of the anchor head main rod 63 to move upward synchronously. Since the contact surface between the sliding block 64 and the anchor frame 62 is a slope, when the sliding block 64 moves upward, it will produce an extrusion effect on the annularly distributed anchor frame 62, forcing the anchor frame 62 to rotate outward around the hinge point at the bottom of the fixed block 61, gradually opening into an umbrella-shaped structure. When the anchor frame 62 is opened to a preset angle, the anti-slip member 67 starts to work to prevent the sliding block 64 from moving downward, ensuring that the anchor frame 62 is tightly engaged with the soft soil layer after grouting reinforcement, forming a stable anchoring state.

[0099] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A grouting type ground anchoring force system for static penetration of soft soil bottom, characterized in that: include: The casing (1) has a plurality of grouting ports (2) arranged around the bottom side; A sleeve (3) is placed inside the sleeve (1) and fixed to the sleeve (1); A drill bit assembly detachably connected to the casing (1); An anchoring assembly, detachably connected to the sleeve (1); The space between the casing (1) and the sleeve (3) is suitable for accommodating a grouting channel (4), and the casing (1) is configured to replace the anchor assembly after drilling by the drill assembly.

2. The grouting type ground anchoring force system for static penetration testing of soft soil according to claim 1 is characterized in that: The drill bit assembly comprises: A metal drill bit (51) is rotatably connected to the bottom of the casing (1) via a drill bit connecting ring (53); A drill rod (52) is inserted into the sleeve (3), and the bottom of the drill rod (52) is fixed to the metal drill bit (51); A drill pipe connecting ring (54) is arranged on the top of the casing (1).

3. The grouting type ground anchoring force system for static penetration testing of soft soil according to claim 1 is characterized in that: The anchoring assembly comprises: A fixing block (61) fixed inside the bottom of the sleeve (1); A plurality of anchor frames (62), the upper ends of which are hinged to the bottom of the fixing block (61); the plurality of anchor frames (62) are distributed in a ring shape; An anchor head main rod (63) is inserted into the sleeve (3); A sliding block (64) is provided between the plurality of anchor frames (62), and the sliding block (64) is connected to the bottom of the anchor head main rod (63); When the sliding block (64) moves upward, it forces the anchor frame (62) to open.

4. The grouting type ground anchoring force system for static penetration testing of soft soil according to claim 3 is characterized in that: The anchor assembly further comprises: A connecting rod (65) is inserted into the sleeve (3); the bottom of the connecting rod (65) is fixed to the fixing block (61), and the anchor head main rod (63) is inserted into the connecting rod (65); The steel strand (66) is passed through the connecting rod (65), and the bottom of the steel strand (66) is connected to the anchor head main rod (63).

5. The grouting type ground anchoring force system for static penetration testing of soft soil according to claim 3 is characterized in that: The contact surface between the sliding block (64) and the anchor frame (62) is a slope surface.

6. The grouting type ground anchoring force system for static penetration testing of soft soil according to claim 3, characterized in that: An anti-slip member (67) is provided inside the anchor frame (62).

7. The grouting type ground anchoring force system for static penetration testing of soft soil according to claim 1, characterized in that: It also includes a grouting stop valve (7), which is arranged in the casing (1) and located at the grouting port (2).

8. A method for using the grouting type ground anchoring force system for static penetration testing of soft soil bottom according to any one of claims 1 to 7, characterized in that: The steps include: The drill bit assembly is mounted on the bottom of the casing (1), hoisted onto the surface of the soft soil layer to be tested, and a hole is drilled in the soft soil layer to be tested; After reaching the predetermined soil layer depth, grouting is injected into the space between the casing (1) and the sleeve (3). After the grouting is completed, the grouting continues to move downward to prepare for grouting reinforcement of the soil layer at the next depth; After the soil layer grouting reinforcement is completed, the casing (1) is removed, the anchor assembly is replaced, and then the casing (1) and the anchor assembly are placed in the above-mentioned drill hole, and anchoring is achieved using the anchor assembly; After the anchoring work is completed, the sleeve (1) and the anchoring assembly are removed.

9. The method of use according to claim 8, characterized in that: The step of installing the drill bit assembly at the bottom of the casing (1), hoisting it onto the surface of the soft soil layer to be tested, and drilling the soft soil layer to be tested comprises: The top of the drill rod (52) in the drill bit assembly is connected to an external drilling machine, and the metal drill bit (51) is driven to rotate through the drill rod (52).

10. The method of use according to claim 8, characterized in that: After the soil layer grouting reinforcement is completed, the casing (1) is removed, the anchor assembly is replaced, and then the casing (1) and the anchor assembly are placed in the above-mentioned drill hole. The anchoring step of using the anchor assembly includes: The steel strand (66) is pulled to pull the anchor head main rod (63) and the sliding block (64) upward, and the sliding block (64) is then moved upward to push the anchor frame (62) to open into an umbrella-shaped structure until the stroke reaches a preset angle, thereby achieving anchoring.

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