Fabricated multi-pipe grouting screw anchor structure for reinforcing multiple layers of silt soft soil

Abstract

The utility model discloses an assembly type multi-pipe grouting screw anchor structure for reinforcing multiple layers of silt soft soil. The assembly type multi-pipe grouting screw anchor structure comprises a screw anchor structure and a grouting device. The spiral anchor structure comprises an anchor rod, an anchor disc and an anchor head; the anchor rod sequentially comprises an outer pipe, a middle pipe and an inner pipe from outside to inside, wherein the outer pipe, the middle pipe and the inner pipe are coaxially arranged at intervals. The multiple outer pipes are arranged at intervals, and the outer pipe located at the bottommost end is provided with an anchor disc and an anchor head. The assembly type grouting pipes are arranged between the adjacent outer pipes and detachably connected with the outer pipes. Grouting channels are formed in the positions, corresponding to the middle pipe and the inner pipe, of the assembly type grouting pipe; a plurality of grouting holes which are uniformly distributed in the circumferential direction of the anchor rod are formed in the positions, corresponding to the middle pipe and the inner pipe, of the outer pipe located at the bottommost end; the grouting device is used for inputting grout of different types or concentrations into the interior of the inner pipe, the middle pipe, the inner pipe and the outer pipe at intervals, and the grout is output from the grouting channel and the grouting hole. And the soft soil layer is reinforced through grouting of the spiral anchor structure and the triple pipe structure.

Description

Technical Field

[0001] This utility model relates to the technical field of foundation reinforcement in building engineering, and in particular to a prefabricated multi-pipe grouting spiral anchor structure for reinforcing multi-layered silty soft soil. Background Technology

[0002] Anchored foundations are a unique type of foundation. Compared to traditional foundations, they can provide pull-out resistance to prevent buildings from heaving and overturning. Their working principle is to provide pull-out resistance to the building through the shear friction between the anchored foundation and the surrounding soil, as well as the weight of the soil. This type of foundation is flexible, economical, and reliable, and has been widely used in housing construction, retaining structures, power transmission towers, transportation, and other fields.

[0003] Soft soil is characterized by low strength, low compression modulus, and high organic matter content. A soft soil foundation refers to a foundation composed of soft soil or containing soft soil layers. Due to these engineering characteristics, construction on soft soil foundations carries significant risks. However, reinforcing the weak soil layers in a soft soil foundation using grouting technology can effectively improve its bearing capacity and settlement resistance, thereby enhancing the safety, applicability, and durability of the building. Current grouting spiral anchors are typically hollow circular tubes that can only inject one type of grout at a time. However, actual construction often requires the simultaneous injection of multiple grouts. Utility Model Content

[0004] The purpose of this invention is to provide a prefabricated grouting spiral anchor structure that utilizes a spiral anchor structure and a triple tube structure to grout and reinforce weak soil layers, allowing for the injection of grouts of different concentrations or types.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A prefabricated multi-pipe grouting spiral anchor structure for reinforcing multi-layered silty soft soil includes a spiral anchor structure and a grouting device.

[0007] The spiral anchor structure includes a triple-tube structure anchor rod, anchor plate, and anchor head;

[0008] The anchor rod, from the outside to the inside, includes an outer tube that is coaxially fixed and spaced apart, a middle tube, and an inner tube. The anchor rod also includes multiple assembled grouting pipes.

[0009] The multiple outer tubes are arranged at intervals, with the anchor plate and anchor head installed on the bottommost outer tube;

[0010] The prefabricated grouting pipe is installed between adjacent outer pipes and is detachably connected to the outer pipes.

[0011] The prefabricated grouting pipe has through holes at corresponding positions of the middle pipe and inner pipe, so that multiple grouting channels are evenly distributed around the anchor rod; the outer pipe at the bottom end has multiple grouting holes evenly distributed around the anchor rod at corresponding positions of the middle pipe and inner pipe.

[0012] The grouting device is used to inject different types or concentrations of grout into the inner tube of the triple tube structure and the two-layer interval of the triple tube structure, respectively. The grout is output from the grouting channel and the grouting hole.

[0013] Furthermore, both ends of the assembled grouting pipe are threadedly connected to the outer pipe.

[0014] Furthermore, the grouting device includes: a grout tank capable of storing three types of grout in sections, multiple electric pressure pumps, and grouting pipes. The electric pressure pumps provide delivery power to the grouting pipes, and the grouting pipes connect the grout tank and the interior of the top of the anchor bolt. Three grouting sub-pipes are arranged side by side inside the grouting pipes, which are used to respectively input the three types of grout into the inner pipe, the middle pipe and the interval between the inner pipes, and the interval between the outer pipe and the inner pipes.

[0015] Furthermore, the through holes or grouting holes on the outer pipe, middle pipe, inner pipe, and assembled grouting pipe are respectively equipped with anti-backflow devices to prevent grout or groundwater in the soft soil layer from flowing back into the triple pipe structure.

[0016] Furthermore, the anti-backflow device includes multiple rubber rings that are fitted over the corresponding positions of the grouting channels or grouting holes in the assembled grouting pipe, the middle pipe, the inner pipe, and the outer pipe, and the rubber rings have holes at the corresponding positions of the grouting channels or grouting holes.

[0017] When the grouting device performs pressure grouting, the rubber ring expands, and the grout is injected into each soft soil layer under pressure from the grouting hole or grouting channel; when grouting stops, the rubber ring contracts to close the grouting channel or grouting hole.

[0018] Furthermore, the spiral anchor structure is a double-anchor-plate spiral anchor structure.

[0019] Furthermore, the anchor head is an inverted cone shape.

[0020] Furthermore, each prefabricated grouting pipe has four rows of grouting channels evenly distributed around its circumference, and the outer pipe at the bottom end has four rows of grouting holes evenly distributed around its circumference.

[0021] Furthermore, along the axial direction of the anchor bolt, each prefabricated grouting pipe is arranged with at least three rows of grouting channels, and the bottom outer pipe is arranged with at least three rows of column grouting holes.

[0022] Furthermore, each prefabricated grouting pipe is arranged with three rows of grouting channels along the axial direction of the anchor bolt.

[0023] In the above technical solution, the prefabricated multi-pipe grouting spiral anchor structure of this utility model has the following beneficial effects:

[0024] Different types or concentrations of grout enter the triple-tube structure and are then injected into each soft soil layer through the grouting holes or channels of the triple-tube structure. For different types of soft soil layers beneath the building, the triple-tube structure allows for the injection of the appropriate grout for each layer. The two ends of the prefabricated grouting pipes can be removed from the outer pipe, allowing for the design of multiple prefabricated grouting pipes with different hole diameters or intervals. This enables the triple-tube structure to select the appropriate prefabricated grouting pipe based on actual construction conditions, thereby dynamically adjusting the grout output and reinforcing the multiple layers of soft soil beneath the building. Compared with existing technologies, the grouting pipe section of this utility model adopts a prefabricated structure. The prefabricated grouting pipe and the anchor rod are connected by threads to form an integral component, simplifying the production process and reducing construction difficulty. This spiral anchor structure, when buried in soft soil, can simultaneously reinforce multiple layers of soft soil at different burial depths. The anchor rod of the spiral anchor is a triple-tube structure, and the triple-tube structure and grouting device are used to reinforce the multiple layers of soft soil beneath the building. Different types or concentrations of grout enter the triple tubes and are then injected into each soft soil layer through the grouting holes and grouting pipes of the triple tubes. This allows for efficient and economical reinforcement of different types of soft soil layers beneath the building. The soft soil layer is reinforced by the shear friction and pull-out resistance of the grouting body and the anchor plate itself against the soil. This prefabricated multi-tube grouting spiral anchor structure can simply, accurately, efficiently, and safely reinforce multiple layers of soft soil beneath the building foundation. The soft soil layer is reinforced by the combined effect of grouting and the anchoring effect of the spiral anchor structure, thereby improving the performance of the building foundation. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0026] Figure 1 A schematic diagram of the prefabricated multi-pipe grouting spiral anchor structure provided by this utility model;

[0027] Figure 2 A schematic diagram of the spiral anchor structure provided by this utility model;

[0028] Figure 3 A plan view of the assembled multi-pipe grouting spiral anchor structure provided by this utility model;

[0029] Figure 4A top view schematic diagram of the spiral anchor structure provided by this utility model;

[0030] Figure 5 A schematic diagram of the connection between the assembled grouting pipe and the outer pipe provided by this utility model;

[0031] Figure 6 A schematic diagram of the anti-backflow device provided by this utility model;

[0032] Figure 7 A top view of the triple tube structure provided by this utility model;

[0033] Figure 8 A schematic diagram of the assembled multi-pipe grouting spiral anchor structure provided by this utility model for grouting.

[0034] Figure label:

[0035] 1. Spiral anchor structure; 2. Anchor bolt; 3. Anchor plate; 4. Anchor head; 5. Outer pipe; 6. Middle pipe; 7. Inner pipe; 8. Prefabricated grouting pipe; 9. Grout chamber; 10. Electric pressure pump; 11. Grouting pipe; 12. Grouting hole; 13. Rubber ring; 14. Grouting channel. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0037] It should be noted that the terms "above," "one end," "up," etc. used in this document indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Similar expressions are only for illustrative purposes and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "part," "two parts," etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] like Figure 1-8 The diagram shows a prefabricated multi-pipe grouting spiral anchor structure for reinforcing multi-layered silty soft soil, including a spiral anchor structure 1 and a grouting device.

[0039] The spiral anchor structure 1 includes a triple-tube anchor rod 2, an anchor disc 3, and an anchor head 4.

[0040] The anchor rod 2 includes, from the outside to the inside, an outer pipe 5, a middle pipe 6, and an inner pipe 7 that are coaxially fixed and spaced apart. The anchor rod 2 also includes multiple assembled grouting pipes 8.

[0041] There are multiple outer tubes 5, which are arranged vertically and horizontally along the axial direction of the anchor rod 2. An anchor plate 3 and anchor head 4 are installed on the bottom outer tube 5.

[0042] The prefabricated grouting pipe 8 is installed between adjacent outer pipes 5 and is detachably connected to the outer pipes 5. The prefabricated grouting pipe 8 is designed to be detachable, and prefabricated grouting pipes 8 of different diameters and quantities can be manufactured. Before use, the appropriate prefabricated grouting pipe 8 is selected and installed as needed, which facilitates the adjustment of grout output.

[0043] The two ends of the prefabricated grouting pipe 8 are threadedly connected to the outer pipe 5.

[0044] Each prefabricated grouting pipe 8 has through holes at corresponding positions on the middle pipe 6 and inner pipe 7, resulting in multiple grouting channels 14 evenly distributed around the circumference of the anchor rod 2. Meanwhile, the outer pipe 5 at the bottom has multiple grouting holes 12 evenly distributed around the circumference of the anchor rod 2 at corresponding positions on the middle pipe 6 and inner pipe 7. In other words, grouting holes 12 are provided on the outer pipe 5, middle pipe 6, and inner pipe 7. The positions of the grouting holes 12 on these three pipes correspond, and their function is similar to that of the grouting channels 14. The grouting holes 12 are radial through holes.

[0045] The grouting device is used to inject different types or concentrations of grout into the inner pipe 7 of the triple-tube structure and the two-layer intervals of the triple-tube structure. Different types or concentrations of grout can be injected into the intervals between the inner pipe 7, the middle pipe 6 and the inner pipe 7, and the outer pipe 5 and the inner pipe 7. The grout is output from the grouting channel 14 and the grouting hole 12. A portion of one type of grout flows out from the grouting channel 14 of the inner pipe 7, sequentially through the middle pipe 6 and the assembled grouting pipe 8, while another portion flows out from the grouting hole 12 at the bottom, sequentially through the middle pipe 6 and the bottommost outer pipe 5. Another type or concentration of grout flows out from the middle pipe 6 and the grouting channel 14 of the assembled grouting pipe 8, or from the middle pipe 6 and the grouting hole 12 of the bottommost outer pipe 5. Yet another type or concentration of grout flows out from the grouting channel 14 of the assembled grouting pipe 8 and the grouting hole 12 of the bottommost outer pipe 5.

[0046] The grouting device includes: a grout tank 9 that can store three types of grout in sections, multiple electric pressure pumps 10, and grouting pipes 11. The electric pressure pumps 10 provide power to the grouting pipes 11. The grouting pipes 11 connect the grout tank 9 and the top interior of the anchor bolt 2, which is the inner pipe of the triple-pipe structure and the three input ports formed by the two layers of spacing. Three grouting sub-pipes are arranged inside the grouting pipes 11. The grouting sub-pipes are used to input the three types of grout into the inner pipe 7, the middle pipe 6 and the interval between the inner pipe 7, and the interval between the outer pipe 5 and the inner pipe 7, respectively.

[0047] Preferably, the through holes or grouting holes 12 on the outer pipe 5, middle pipe 6, inner pipe 7, and assembled grouting pipe 8 are respectively equipped with anti-backflow devices to prevent grout or groundwater in the soft soil layer from flowing back into the triple pipe structure.

[0048] Specifically, the anti-backflow device includes multiple rubber sleeves 13 which are fitted and covered on the corresponding positions of the grouting channels 14 or grouting holes 12 in the assembled grouting pipe 8, the middle pipe 6, the inner pipe 7, and the outer pipe 5. The rubber sleeves 13 have holes at the corresponding positions of the grouting channels 14 or grouting holes 12. It is easy to imagine that multiple grouting channels 14 or multiple grouting holes 12 are arranged at the same height along the axial direction of the anchor rod 2, so as to facilitate the installation of the minimum number of rubber sleeves 13.

[0049] When the grouting device performs pressure grouting, the hole on the rubber ring 13 is opened, and the grout is injected into each soft soil layer under pressure from the grouting hole 12 or the grouting channel 14; when grouting is stopped, the rubber ring 13 contracts to close the grouting channel 14 or the grouting hole 12.

[0050] Preferably, the spiral anchor structure 1 is a double-anchor-plate spiral anchor structure. Two anchor plates 3 are set on the outer pipe at the bottom, and the grouting hole 12 is set between the two anchor plates 3.

[0051] Preferably, the anchor head 4 is an inverted cone shape.

[0052] Preferably, each prefabricated grouting pipe 8 has four rows of grouting channels 14 evenly distributed around its circumference, and the outer pipe 5 at the bottom end has four rows of grouting holes 12 evenly distributed around its circumference. Along the circumference of the anchor rod 2, two adjacent rows of grouting channels 14 or two rows of grouting holes 12 are arranged at 90°.

[0053] Along the axial direction of the anchor bolt 2, each prefabricated grouting pipe 8 is provided with at least three rows of grouting channels 14, and the bottommost outer pipe 5 is provided with at least three rows of column grouting holes 12.

[0054] Preferably, each assembled grouting pipe 8 is provided with three rows of grouting channels 14 along the axial direction of the anchor bolt 2.

[0055] Example 1:

[0056] like Figure 1 As shown, the spiral anchor structure is arranged at the four corners of the building and connected to the grouting device. Different types or concentrations of electrolyte solutions are delivered to the gaps between the three grouts in the grout chamber 9 through the electric pressure pump 10 and the grouting pipe 11. The grouts reach the interior of the soft soil layer through the grouting holes 12 and grouting channels 14 on the pipe wall.

[0057] like Figure 2 , Figure 3As shown, the spiral anchor structure 1 has an anchor rod 2, an anchor plate 3, and an anchor head 4. Two anchor plates 3 and four rows of grouting holes 12 are set at the lower end of the anchor rod 2. The soil layer at the bottom of the anchor rod is reinforced by grouting and the shear friction and pull-out action between the anchor plate 2 and the soil. The anchor head 4 of the spiral anchor structure is an inverted cone shape, which facilitates the embedding of the spiral anchor structure in the soil. Prefabricated grouting pipes 8 are arranged within the elevation range of the lower soft soil layer to be reinforced. Three rows of grouting channels 14 are evenly arranged along the circumference of the prefabricated grouting pipe 8. Several rubber rings 13 are fitted on the pipe wall of each of the outer pipe 5, middle pipe 6, inner pipe 7 and prefabricated grouting pipe 8 to prevent backflow. The rubber rings 13 cover the grouting holes 12 or grouting channels 14. Small holes are opened on the rubber rings 13 corresponding to the positions of the grouting holes 12 or grouting channels 14.

[0058] like Figure 3 , Figure 4 As shown, the anchor rod 2 of the spiral anchor structure 1 is composed of a triple tube structure. The triple tube structure consists of three concentric hollow circular tubes with holes of different diameters: outer tube 5, middle tube 6, and inner tube 7. The bottom of the inner tube and the middle tube of the triple tube are closed and fixed to each other to prevent the grout from mixing. The triple tube structure is rotated and buried in the soil.

[0059] like Figure 5 As shown, the prefabricated grouting pipe 8 and the anchor rod 2 are connected by threads to form an integral component in each layer. The length of the prefabricated grouting pipe 8 (standard section and non-standard section) can be installed and disassembled according to the depth and number of layers of soft soil.

[0060] The prefabricated spiral anchor structure is arranged at the four corners of the building and buried in the soil. Different types or concentrations of electrolyte solutions are delivered to the gaps between the triple pipes through an electric pressure pump 10 and a grouting pipe 11 with three outlets that can output three types of grout. The triple pipe structure can separate different types and kinds of grout. The different grouts are delivered to the interior of each soft soil layer for grouting and reinforcement through the grouting holes 12 and grouting channels 14 on the pipe wall.

[0061] Based on the elevation range of the multiple soft soil layers below the building, prefabricated grouting pipes 8 are installed within the soft soil layer elevation range. Four rows of grouting channels 14 are evenly arranged along the circumference of the prefabricated grouting pipe 8, or four rows of grouting holes 12 are evenly distributed along the circumference of the outer pipe 5 at the bottom. The prefabricated grouting pipe 8 and the anchor rod 2 are connected by threads to form an integral component. The prefabricated grouting pipe 8 can be installed and disassembled according to the depth and number of soft soil layers. Four rows of grouting holes are set at the bottom of the anchor rod. During grouting, the electric pressure pump 10 pressurizes and injects various grouts into the triple pipe structure. For different soft soil layers, different types and concentrations of grouts are pressed into each soft soil layer through the grouting holes 12 and grouting channels 14. The grouting channels 14 can prevent the grouts from mixing. At the same time, the soft soil layer is reinforced by grouting reinforcement and the shear friction and pull-out action of the anchor plate 3 at the lower end of the spiral anchor rod 2 with the soil.

[0062] When not in operation, the rubber sleeve 13 covers the inner, middle and outer grouting holes 12. The function of the rubber sleeve 13 is to expand when the grouting pipe section is grouting under pressure, so that the grout is injected into each soft soil layer under pressure from the inner, middle and outer grouting holes 12. When grouting stops, the rubber sleeve 13 retracts and seals the grouting holes 12 to prevent the grout or groundwater in the soft soil layer from flowing back into the triple pipe structure.

[0063] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A prefabricated multi-pipe grouting spiral anchor structure for reinforcing multi-layered silty soft soil, characterized in that, Includes a spiral anchor structure (1) and a grouting device; The spiral anchor structure (1) includes a triple-tube structure anchor rod (2), an anchor plate (3), and an anchor head (4); The anchor rod (2) includes, from the outside to the inside, an outer tube (5) that is coaxially fixed and spaced apart, a middle tube (6) and an inner tube (7). The anchor rod (2) also includes multiple assembled grouting pipes (8). Multiple outer tubes (5) are arranged vertically at intervals, and the anchor plate (3) and anchor head (4) are set on the outer tube (5) at the bottom. The assembled grouting pipe (8) is arranged between adjacent outer pipes (5) and is detachably connected to the outer pipe (5); The prefabricated grouting pipe (8) and the corresponding positions of the middle pipe (6) and inner pipe (7) are respectively provided with through holes so that multiple grouting channels (14) are evenly distributed around the anchor rod (2); the outer pipe (5) at the bottom end and the corresponding positions of the middle pipe (6) and inner pipe (7) are respectively provided with multiple grouting holes (12) evenly distributed around the anchor rod (2). The grouting device is used to inject different types or concentrations of grout into the inner tube (7) of the triple tube structure and the two-layer interval of the triple tube structure respectively. The grout is output from the grouting channel (14) and the grouting hole (12) respectively.

2. The prefabricated multi-pipe grouting spiral anchor structure for reinforcing multi-layered silty soft soil according to claim 1, characterized in that, The two ends of the assembled grouting pipe (8) are threadedly connected to the outer pipe (5).

3. The prefabricated multi-pipe grouting spiral anchor structure for reinforcing multi-layered silty soft soil according to claim 1, characterized in that, The grouting device includes: a grout tank (9) capable of storing three types of grout in sections, multiple electric pressure pumps (10) and grouting pipes (11). The electric pressure pumps (10) provide power to the grouting pipes (11). The grouting pipes (11) are connected to the grout tank (9) and the top of the anchor bolt (2). Three grouting sub-pipes are arranged in parallel inside the grouting pipes (11). The grouting sub-pipes are used to respectively input the three types of grout into the inner pipe (7), the middle pipe (6) and the interval between the inner pipe (7), and the interval between the outer pipe (5) and the inner pipe (7).

4. The prefabricated multi-pipe grouting spiral anchor structure for reinforcing multi-layered silty soft soil according to claim 1, characterized in that, The through holes or grouting holes (12) on the outer pipe (5), middle pipe (6), inner pipe (7), and assembled grouting pipe (8) are respectively equipped with anti-backflow devices to prevent grout or groundwater in the soft soil layer from flowing back into the triple pipe structure.

5. The prefabricated multi-pipe grouting spiral anchor structure for reinforcing multi-layered silty soft soil according to claim 4, characterized in that, The anti-backflow device includes multiple rubber sleeves (13) which are fitted and covered on the corresponding positions of the grouting channels (14) or grouting holes (12) of the assembled grouting pipe (8), middle pipe (6), inner pipe (7) and outer pipe (5). The rubber sleeves (13) have holes at the corresponding positions of the grouting channels (14) or grouting holes (12). When the grouting device performs pressure grouting, the hole on the rubber ring (13) is opened, and the grout is injected into each soft soil layer under pressure from the grouting hole (12) or the grouting channel (14); when grouting is stopped, the rubber ring (13) contracts to close the grouting channel (14) or the grouting hole (12).

6. The prefabricated multi-pipe grouting spiral anchor structure for reinforcing multi-layered silty soft soil according to claim 1, characterized in that, The spiral anchor structure (1) is a double-anchor-plate spiral anchor structure.

7. The prefabricated multi-pipe grouting spiral anchor structure for reinforcing multi-layered silty soft soil according to claim 1, characterized in that, The anchor head (4) is an inverted cone shape.

8. The prefabricated multi-pipe grouting spiral anchor structure for reinforcing multi-layered silty soft soil according to claim 1, characterized in that, Each prefabricated grouting pipe (8) has four rows of grouting channels (14) evenly distributed around its circumference, and the outer pipe (5) at the bottom end has four rows of grouting holes (12) evenly distributed around its circumference.

9. A prefabricated multi-pipe grouting spiral anchor structure for reinforcing multi-layered silty soft soil according to claim 8, characterized in that, Along the axial direction of the anchor rod (2), each prefabricated grouting pipe (8) is provided with at least three rows of grouting channels (14), and the bottom outer pipe (5) is provided with at least three rows of column grouting holes (12).

10. A prefabricated multi-pipe grouting spiral anchor structure for reinforcing multi-layered silty soft soil according to claim 1, characterized in that, Along the axial direction of the anchor bolt (2), each prefabricated grouting pipe (8) has three rows of grouting channels (14).

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