A deformation directional grouting device and vacuum combined directional grouting foundation construction method
By combining deformation directional grouting devices and methods with high-pressure grouting and vacuum prepression, the problem of difficult to achieve economical and efficient foundation treatment in deep backfill sites is solved, and a deeper and more stable foundation treatment effect is achieved.
Patent Information
- Application Number
- CN202211325212.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-10-27
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2042-10-27
AI Technical Summary
The prior art is difficult to achieve both economical and efficient foundation treatment on formed deep backfill sites.
The deformation directional grouting device and vacuum combined with directional grouting foundation construction method is adopted, and high-pressure grouting and vacuum combined prepressure are combined, and the slurry is sucked into the vertical drainage body through negative pressure to form a vertebral body with a large bottom and a small top to achieve bottom-up foundation treatment.
This method can stabilize the foundation at depths that cannot be achieved by traditional methods, save materials, improve overall stability, and is faster than vacuum combined prepression and more applicable.
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Figure CN115584717B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of construction engineering, and in particular to a deformation directional grouting device and a vacuum combined directional grouting foundation construction method. Background Art
[0002] Generally, for sites in deep backfill areas, especially the miscellaneous fill areas caused by the previous dumping of mountain backfill areas, the soil layer itself is thick, with high water content, relatively large voids, low shear strength and high compressibility, low permeability, obvious structure and significant rheology, such as silt, silty soil, clay, silt, loess, sandy soil, artificial fill and gravel soil.
[0003] Commonly used foundation treatment methods include dynamic compaction, vibro replacement, piling, vacuum preloading, and surcharge preloading. For thick soil with high clay content, dynamic compaction cannot reach the treatment depth, and piling is expensive. Generally, vacuum preloading, surcharge preloading, and vacuum combined surcharge preloading are used. For example, the actual effect of vacuum preloading is limited and it can only be applied to projects with low load requirements. The vacuum combined surcharge preloading method can achieve a higher load treatment effect, but it requires a large amount of surcharge material and a long molding cycle, so it is rarely used compared to general situations.
[0004] The soft soil foundation is treated by chemical reinforcement method. The most common chemical reinforcement method is high-pressure jet grouting. It uses special high-pressure jet machinery to punch the soil in the foundation through a high-pressure jet stream, and replace part of the soil with slurry to form a cement soil reinforcement. According to the composition of the jet stream, the high-pressure jet grouting method includes single-tube method, double-tube method, and triple-tube method. After treatment, a composite foundation can be formed to increase the bearing capacity and reduce settlement. The grouting method for treating the foundation is difficult to form a uniform consolidation surface due to the different gaps between the soil layers. If there are cracks and voids, it will lead to a large amount of local material consumption, and the surrounding area will not be effectively consolidated, resulting in a large area of weak layers. Increasing the density and deepening of the grouting holes will greatly increase the cost of foundation treatment.
[0005] Therefore, for deep backfill sites that have already been formed, traditional treatment methods are difficult to achieve both economical and efficient results. Summary of the invention
[0006] The purpose of the present invention is to provide a deformable directional grouting device and a vacuum combined directional grouting foundation construction method to solve the technical problem that it is difficult to achieve both economical and efficient results in the conventional method for the formed deep backfill site in the prior art. The preferred technical scheme among the many technical schemes provided by the present invention can produce many technical effects as described below.
[0007] To achieve the above object, the present invention provides the following technical solutions:
[0008] The present invention provides a deformation directional grouting device, comprising a slurry pipeline, a protective sleeve and a cutting blade, wherein:
[0009] A first connection structure is provided on the cutting blade, and a second connection structure is provided on the outer surface of the slurry pipe, and the first connection structure and the second connection structure are hingedly connected via a connecting piece;
[0010] The protective sleeve is sleeved on the outer side of the slurry pipe, and a groove structure for the cutting blade to extend out is opened on the protective sleeve. A sliding tenon is arranged inside the protective sleeve, and a sliding groove matching with the sliding tenon is arranged on the outer side of the cutting blade.
[0011] Preferably, the cutting blades include a plurality of groups, and each group of the cutting blades is configured to include a plurality of blades, wherein:
[0012] The plurality of groups of cutting blades are evenly distributed along the axial direction of the slurry pipeline;
[0013] The plurality of cutting blades in each group are evenly distributed along the circumference of the slurry pipe;
[0014] The groove structures are arranged in one-to-one correspondence with the cutting blades.
[0015] Preferably, the cross-section of the sliding tenon is a triangular structure.
[0016] Preferably, the first connection structure and the second connection structure both adopt an articulated seat, and the connecting member adopts an articulated shaft.
[0017] Preferably, it also includes a spraying pipe, which is arranged in the slurry pipeline.
[0018] A vacuum combined directional grouting foundation construction method, using the above-mentioned deformation directional grouting device, comprises the following steps:
[0019] S1: laying the lower sand cushion layer, installing the vertical drainage board, constructing the outer sealing ditch, laying the horizontal drainage pipe, connecting the vertical drainage board with the horizontal drainage pipe, laying the geotextile and the sealing membrane, and connecting the vacuum equipment;
[0020] S2: The geotextile is laid on the sealing membrane, and the periphery is laid all the way to the edge of the sealing ditch, and is compacted and fixed with clay, and then a sand cushion is laid to protect the sealing layer, on which a preloading load can be applied;
[0021] S3: Directional drilling a hole on the side of the foundation to be treated, and after the hole is drilled, the grouting pipe and the deformable directional grouting device are dragged into the predetermined position;
[0022] S4: one side of the grouting hole is blocked, the gas in the grouting pipe is emptied, and the other side is grouted and pressurized, and the vacuum equipment is turned on to assist the slurry to move upward;
[0023] S5: When the grouting slurry flowing out of the drainage hole of the horizontal drainage pipe is close to the prepared slurry in consistency, the grouting of a certain layer is considered to be completed. After the grouting pipe is pulled out, the grouting hole is sealed and the next layer of grouting is carried out. After the grouting is completed, the vacuum equipment is shut down for a delay to allow the slurry to fully diffuse.
[0024] Preferably, in step S3, the directional drilling is:
[0025] When drilling holes between drain boards, the gap distance and directional drilling accuracy should be fully considered to ensure that the integrity of the drain board is not damaged during the drilling process. If damage occurs during the drilling process, a vertical drain board needs to be drilled near the location.
[0026] The grouting layering is determined by the depth of foundation treatment and can be one or more layers.
[0027] Preferably, when the processing depth is deep and the directional drilling accuracy is not high, step one and step three can be performed in a swapped order.
[0028] Preferably, the grouting material is prepared on-site, and the preparation and conveying equipment includes a stirring tank, a conveying pipeline, a mixing tank, a grouting pump and a slurry collection tank connected in sequence.
[0029] Preferably, in step S4, if multi-layer grouting is adopted, grouting should be started from the deep holes, and then shallow holes should be filled after completion.
[0030] The present invention provides a deformable directional grouting device and a vacuum combined directional grouting foundation construction method, which combine high-pressure grouting with vacuum combined preloading foundation treatment to form a bottom-up treatment method different from the traditional method. The slurry injected in the lower layer is sucked into the vertical drainage body by relying on negative pressure to form a cone-shaped body with a large bottom and a small top. Compared with the traditional grouting treatment method, this method is more stable in treating the foundation; compared with the traditional simple grouting treatment, the depth is deeper and the treatment effect is better, and the speed is faster than the vacuum combined preloading and the applicability is stronger; due to the use of the vacuum negative pressure drainage and guiding effect, the slurry shape is basically controllable, a large amount of material is saved, and the overall stability is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] 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.
[0032] Figure 1 It is a structural schematic diagram of an embodiment of a deformation directional grouting device of the present invention;
[0033] Figure 2 yes Figure 1 Schematic diagram of the main structure;
[0034] Figure 3 is a cross-sectional view of the deformation directional grouting device of the present invention;
[0035] Figure 4 is a longitudinal section view of the deformation directional grouting device of the present invention;
[0036] Figure 5 is a cross-sectional view of a cutting blade in the deformable directional grouting device of the present invention;
[0037] Figure 6 It is a longitudinal section view of a cutting blade in the deformable directional grouting device of the present invention;
[0038] Figure 7 It is a schematic structural diagram of the expansion of the cutting blades in the deformation directional grouting device of the present invention;
[0039] Figure 8 yes Figure 7 Schematic diagram of the main structure;
[0040] Fig. 9 It is a cross-sectional view of the cutting blade in the deformation directional grouting device of the present invention;
[0041] Fig.10 It is a longitudinal section view of the cutting blade in the deformation directional grouting device of the present invention;
[0042] Fig.11 It is a structural schematic diagram of the cutting blade in the deformation directional grouting device of the present invention in a closed state;
[0043] Fig.12 It is a structural schematic diagram of the cutting blade in the deformation directional grouting device of the present invention in an expanded state;
[0044] Fig.13 It is a cross-sectional view of the vacuum combined directional grouting foundation of the present invention;
[0045] Fig.14 It is a top view of the vacuum combined directional grouting foundation of the present invention;
[0046] Fig.15 It is a double-layer stereogram of the vacuum combined directional grouting foundation of the present invention.
[0047] In the figure: 1. sand cushion layer; 2. pile loading; 3. sealing ditch; 4. vertical drainage board; 5. grouting pipe; 6. deformation directional grouting device; 61. slurry pipeline; 611. second connection structure; 62. protective sleeve; 620. sliding tenon; 63. cutting blade; 630. slide groove; 631. first connection structure; 64. spraying pipe; 7. vacuum equipment; 8. sealing membrane; 9. horizontal drainage pipe. DETAILED DESCRIPTION
[0048] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.
[0049] The present invention provides a deformation directional grouting device. Figure 1 is a schematic diagram of the structure of this embodiment, Figure 2 yes Figure 1 The main structure diagram is as follows: Figure 1 and Figure 2 As shown, it includes a slurry pipeline 61, a protective sleeve 62 and a cutting blade 63.
[0050] Specifically, in this embodiment, the cutting blades 63 include multiple groups, and each group of cutting blades 63 is configured to include multiple groups, wherein the multiple groups of cutting blades 63 are evenly distributed along the axial direction of the slurry pipe 61; the multiple cutting blades 63 in each group are evenly distributed along the circumferential direction of the slurry pipe 61; and the groove structure is arranged one-to-one with the cutting blades 63.
[0051] in, Figure 3 is a cross-sectional view of this embodiment, Figure 4 is a longitudinal sectional view of this embodiment, Figure 5 is a cross-sectional view of the cutting blade in this embodiment, Figure 6 is the longitudinal section of the cutting blade, such as Figure 3-Figure 6 As shown, a first connection structure 631 is provided on the cutting blade 63, and a second connection structure 611 is provided on the outer surface of the slurry pipe 61. The first connection structure 631 and the second connection structure 611 are hingedly connected via a connecting piece.
[0052] The protective sleeve 62 is sleeved on the outer side of the slurry pipe 61, and a groove structure for the cutting blade 63 to extend is provided on the protective sleeve 62. A sliding tenon 620 is provided inside the protective sleeve 62, and a sliding groove 630 matching the sliding tenon 620 is provided on the outer side of the cutting blade 63. A grouting pipe 64 is also included, and the grouting pipe 64 is provided in the slurry pipe 61.
[0053] Figure 7 is a schematic diagram of the structure in which the cutting blades are unfolded in this embodiment, Figure 8 yes Figure 7 The main structure diagram is as follows: Figure 7 and Figure 8As shown, through the slurry pipe 61 arranged on the inner side, the slidable protective sleeve 62 outside the slurry pipe 61 and the foldable cutting blade 63, during installation, the protective sleeve 62 is fixed to the outside of the slurry pipe 61 by means of the sliding tenon 620 connected thereto, and ensures that the sliding tenon 620 is aligned with the slide groove 630.
[0054] in, Fig. 9 is a cross-sectional view of the cutting blade in this embodiment, Fig.10 is a longitudinal section view of the cutting blade in this embodiment, as shown in FIG. Fig. 9 and Fig.10 As shown, when in use, the deformation process is that the protective sleeve 62 drives the sliding tenon 620 thereon to move toward the cutting blade 63, and the sliding tenon 620 slides into the sliding groove 630.
[0055] Fig.11 : is a schematic diagram of the structure of the cutting blade in the closed state in this embodiment, Fig.12 FIG. 1 is a schematic diagram of the structure of the cutting blade in the expanded state in this embodiment. Fig.11 and Fig.12 As shown, by utilizing the lever principle, the cutting blade 63 is opened outward with the connection between the first connecting structure 631 and the second connecting structure 611 as the rotation axis. After the grouting is completed, the protective sleeve 62 drives the sliding tenon 620 away from the cutting blade 63. The pipeline drags the soil pressure on the cutting blade 63, and the cutting blade 63 is closed with the connection between the first connecting structure 631 and the second connecting structure 611 as the rotation axis.
[0056] As an optional implementation, in this embodiment, the cross-section of the sliding tenon 620 is a triangular structure to make the connection more stable and avoid the problem of the sliding tenon 620 falling out of the sliding groove 630 during use.
[0057] As an optional implementation, both the first connection structure 631 and the second connection structure 611 use hinged seats, and the connecting member uses a hinged shaft.
[0058] A vacuum combined directional grouting foundation construction method, using the above-mentioned deformation directional grouting device, Fig.13 is a cross-sectional view of the vacuum combined directional grouting foundation of this embodiment, Fig.14 is a top view of the vacuum combined directional grouting foundation of this embodiment, Fig.15 It is a double-layer stereogram of the vacuum joint directional grouting foundation, such as Figure 13-Figure 15 As shown, the following steps are included:
[0059] S1: Lay the lower sand cushion layer 1, install the vertical drainage board 4, construct the outer sealing ditch 3, lay the horizontal drainage pipe 9, connect the vertical drainage board 4 with the horizontal drainage pipe 9, lay the geotextile and the sealing membrane 8, and connect the vacuum equipment 7. In this embodiment, the vacuum equipment adopts a vacuum pump.
[0060] S2: The geotextile laid on the sealing membrane 8 is laid all the way to the edge of the sealing ditch 3 and is compacted and fixed with clay. Then a sand cushion layer is laid to protect the sealing layer, on which the pile material 2 can be used for preloading.
[0061] S3: Directional drilling is performed on the side of the foundation to be treated. After the drilling is completed, the grouting pipe 5 and the deformable directional grouting device 6 are dragged into the predetermined position.
[0062] Specifically, in this embodiment, the deformable directional grouting device 6 adopts a columnar grouting device that pops up a grouting nozzle as needed. By connecting the deformable directional grouting device 6 to the grouting pipe 5 and towing it with a directional drill, the directional drill can be driven to rotate and cut the soil.
[0063] The grouting layering is determined by the depth of the foundation treatment, and may be one or more layers. In this embodiment, the directional drilling is: drilling holes between the plastic drain boards, and the gap distance and directional drilling accuracy should be fully considered to ensure that the integrity of the plastic drain board is not damaged during the drilling process. If damage occurs during the drilling process, a vertical drain board needs to be added near the location.
[0064] When the processing depth is deep and the directional drilling accuracy is not high, steps one and three can be performed in reverse order.
[0065] The specific working process is: push the protective sleeve 62 to complete the ejection of the cutting blade 63, and perform high-pressure grouting while rotating and cutting the soil. When in use, negative pressure suction is performed with the assistance of the upper vacuum combined with pre-pressure, so that the slurry can be fully diffused into the soil near the stratum to be treated and the vertical drainage body to form a whole. After the grouting is completed, the deformation directional grouting device will be pulled out for reuse.
[0066] S4: One side of the grouting hole is blocked, the gas in the grouting pipe 5 is emptied, and the other side is pressurized for grouting, and the vacuum equipment 7 is turned on to assist the slurry to go up; if multi-layer grouting is used, grouting should start from the deep hole, and then the shallow hole should be filled after completion.
[0067] S5: When the grouting slurry flowing out of the drainage hole of the horizontal drainage pipe 9 has a consistency close to the prepared slurry, it is considered that a certain layer of grouting is completed. After the grouting pipe is pulled out, the grouting hole is sealed and the next layer of grouting is carried out. After the grouting is completed, the vacuum equipment 7 is shut down for a delay to allow the slurry to fully diffuse.
[0068] The grouting material in this embodiment is prepared on-site, and the preparation and transportation equipment includes a stirring tank, a transportation pipeline, a mixing tank, a grouting pump and a slurry collection tank connected in sequence.
[0069] The beneficial effects of this embodiment are:
[0070] Combining high-pressure grouting with vacuum combined preloading foundation treatment forms a bottom-up treatment method that is different from the traditional method. The slurry injected into the lower layer is sucked into the vertical drainage body by relying on negative pressure to form a cone-shaped body with a large bottom and a small top. Compared with the traditional grouting treatment method, this method is more stable in foundation treatment; compared with the traditional simple grouting treatment, the depth is deeper and the treatment effect is better, and it is faster than vacuum combined preloading and has strong applicability; due to the use of vacuum negative pressure drainage and guiding effect, the slurry shape is basically controllable, saving a lot of materials and improving overall stability.
[0071] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.
Claims
1. A deformation directional grouting device, characterized in that: It includes a slurry pipeline, a protective casing and a cutting blade, wherein: A first connection structure is provided on the cutting blade, and a second connection structure is provided on the outer surface of the slurry pipe, and the first connection structure and the second connection structure are hingedly connected via a connecting piece; The protective sleeve is sleeved on the outer side of the slurry pipe, a groove structure for the cutting blade to extend is provided on the protective sleeve, a sliding tenon is provided inside the protective sleeve, and a sliding groove matching with the sliding tenon is provided on the outer side of the cutting blade; The cutting blades include multiple groups, and each group of cutting blades is configured to include multiple cutting blades, wherein: The plurality of groups of cutting blades are evenly distributed along the axial direction of the slurry pipeline; The plurality of cutting blades in each group are evenly distributed along the circumference of the slurry pipe; The groove structures are arranged in one-to-one correspondence with the cutting blades; The cross section of the sliding tenon is a triangular structure; The first connection structure and the second connection structure both adopt an articulated seat, and the connection member adopts an articulated shaft.
2. A deformation directional grouting device according to claim 1, characterized in that: It also includes a spraying pipe, which is arranged in the slurry pipeline.
3. A vacuum combined directional grouting foundation construction method, characterized in that: The deformation directional grouting device according to claim 1 or 2 comprises the following steps: S1: laying the lower sand cushion layer, installing the vertical drainage board, constructing the outer sealing ditch, laying the horizontal drainage pipe, connecting the vertical drainage board with the horizontal drainage pipe, laying the geotextile and the sealing membrane, and connecting the vacuum equipment; S2: The geotextile is laid on the sealing membrane, and the periphery is laid all the way to the edge of the sealing ditch, and is compacted and fixed with clay, and then a sand cushion is laid to protect the sealing layer, and a preload is applied thereon; S3: Directional drilling a hole on the side of the foundation to be treated, and after the hole is drilled, the grouting pipe and the deformable directional grouting device are dragged into the predetermined position; S4: one side of the grouting hole is blocked, the gas in the grouting pipe is emptied, and the other side is grouted and pressurized, and the vacuum equipment is turned on to assist the slurry to move upward; S5: When the grouting slurry flowing out of the drainage hole of the horizontal drainage pipe is close to the prepared slurry in consistency, the grouting of a certain layer is considered to be completed. After the grouting pipe is pulled out, the grouting hole is sealed and the next layer of grouting is carried out. After the grouting is completed, the vacuum equipment is shut down for a delay to allow the slurry to fully diffuse.
4. The vacuum combined directional grouting foundation construction method according to claim 3 is characterized in that: In step S3, the directional drilling is: When drilling holes between drain boards, the gap distance and directional drilling accuracy should be fully considered to ensure that the integrity of the drain board is not damaged during the drilling process. If damage occurs during the drilling process, a vertical drain board needs to be drilled near the location. The grouting layering is determined by the depth of foundation treatment and can be one or more layers.
5. The vacuum combined directional grouting foundation construction method according to claim 3 or 4, characterized in that: When the processing depth is deep and the directional drilling accuracy is not high, steps one and three can be performed in reverse order.
6. The vacuum combined directional grouting foundation construction method according to claim 3 is characterized in that: The grouting material is prepared on site, and the preparation and transportation equipment includes a stirring tank, a transportation pipeline, a mixing tank, a grouting pump and a slurry collection tank connected in sequence.
7. The vacuum combined directional grouting foundation construction method according to claim 3 is characterized in that: In step S4, if multi-layer grouting is adopted, grouting should be started from the deep hole, and then the shallow hole should be grouting after completion.
Citation Information
Patent Citations
Deformation directional grouting device
CN218757411U