A layered grouting reinforcement device for silty sand foundation

Abstract

This utility model discloses a layered grouting reinforcement device for silty sand foundations, belonging to the technical field of foundation grouting equipment. It includes a multi-section grouting pipe, consisting of detachably connected rigid and flexible pipe sections that are alternately assembled via flanges and quick-release clamps. Grouting holes are provided on the pipe wall of the multi-section grouting pipe, and these holes adopt a stepped aperture design. The flexible pipe section has a double-layer corrugated pipe structure, with an outer layer covered by a 1-2mm thick corrosion-resistant silicone film and an inner layer embedded with a 0.3-0.5mm thick carbon fiber reinforcement layer. This utility model improves upon existing grouting casing designs by using a multi-section grouting pipe, allowing for the addition or removal of additional pipe sections according to different foundation grouting depths, thus enhancing applicability and facilitating layered grouting at different depths. The double-layer corrugated pipe structure of the flexible pipe section effectively solves the problems of chemical corrosion and mechanical deformation that easily occur with traditional grouting pipes in silty sand strata.

Description

Technical Field

[0001] This utility model relates to the technical field of foundation grouting equipment, specifically a layered grouting reinforcement device for silty sand foundation. Background Technology

[0002] Due to its high water content, high compressibility, and high permeability, silty sand geology presents challenges for concrete structures compared to conventional soil conditions. These challenges include poor forming stability, difficulty in ensuring structural integrity, and insufficient long-term durability. These problems not only affect the service life of the project but may also lead to safety hazards.

[0003] The foundation refers to the soil or rock mass that supports the foundation of a building. It plays a very important role in ensuring the strength and durability of the building. When carrying out foundation treatment, it is necessary to reinforce it. Generally, this is done by injecting mud into the foundation to fill the gaps and strengthen it, thereby increasing the strength of the foundation and extending the service life of the building.

[0004] Chinese Patent No. CN214832577U discloses a layered dual-channel underground grouting structure. This structure includes a grout supply system, an injection system, and a monitoring system. The tandem grouting sleeves and tension-fixed separators in the injection system enable layered grouting of the soil. The synergistic effect of the dual-channel grout supply, the openable / closable grouting holes, and the tension-fixed separator allows for time-sharing and channel-based grouting of different types of grout. An acoustic detector can monitor and assess the soil's cementation level in real time. This invention's structure requires only one drilling operation to meet the different cementation levels needed in grouting reinforcement of strata, reducing the number of grout pipe movements and improving work efficiency and grout utilization.

[0005] However, when using the above-mentioned grouting device, it is difficult to adjust the grouting depth of the grouting sleeve in the grouting system. Since the length structure of the sleeve is integrally formed, the whole unit needs to be replaced when grouting at different foundation depths. This process is relatively troublesome and labor-intensive, consuming different amounts of time and manpower, increasing costs. Consequently, the above-mentioned grouting sleeve is not conducive to grouting at different depths in layers. At the same time, traditional grouting pipes are prone to chemical corrosion and mechanical deformation in silty sand strata, which requires periodic replacement of the entire grouting pipe set, affecting the performance. Utility Model Content

[0006] The purpose of this invention is to provide a layered grouting reinforcement device for silty sand foundations to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a layered grouting reinforcement device for silty sand foundation, comprising a multi-section grouting pipe, wherein the multi-section grouting pipe is alternately assembled from detachably connected rigid pipe sections and flexible pipe sections through flanges and quick-release clamps, and grouting holes are provided on the pipe wall of the multi-section grouting pipe.

[0008] Furthermore, the grouting holes are arranged in a ring array, and the axial spacing between adjacent hole groups is 15-20cm.

[0009] Furthermore, the flange is located at both ends of the rigid pipe section and the flexible pipe section.

[0010] Furthermore, the quick-release clamps are installed on the flanges adjacent to the pipe section to achieve a fixed connection.

[0011] Furthermore, the grouting holes adopt a stepped diameter design, with an inner hole diameter of 3-5mm and an outer hole diameter of 6-8mm.

[0012] Furthermore, the flexible pipe section has a double-layer corrugated pipe structure, with the outer layer covered by a 1-2mm thick corrosion-resistant silicone film and the inner layer embedded with a 0.3-0.5mm thick carbon fiber reinforcement layer.

[0013] Furthermore, the rigid pipe section is made of No. 45 steel.

[0014] The beneficial effects of this utility model are: 1. By designing the existing grouting sleeve, this layered grouting reinforcement device uses a multi-section grouting pipe, which consists of detachable rigid and flexible pipe sections that can be alternately assembled using flanges and quick-release clamps. Additional pipe sections can be added or removed according to the foundation grouting operation at different depths, thereby improving applicability, saving time and effort, and facilitating the layered grouting at different depths.

[0015] 2. By setting stepped grouting hole diameters on the wall of the multi-section grouting pipe, the inner hole diameter is used for the initial stage of high-pressure grouting, and the outer hole diameter is used for the grout diffusion stage. Enlarging the hole diameter can reduce flow resistance and promote radial penetration of grout, thereby increasing the grouting effect of the grouting pipe during the grouting process and improving its practical performance.

[0016] 3. The flexible pipe section is designed with a double-layer corrugated pipe structure. The outer layer is covered with a 2mm thick corrosion-resistant silicone film, which has excellent acid and alkali resistance and can maintain structural integrity in a highly corrosive grout environment with pH 3-11. The inner layer is embedded with a 0.5mm thick carbon fiber reinforcement layer, which ensures that the pipe section maintains its flexibility while ensuring a pressure bearing capacity of ≥8MPa. This structural design effectively solves the problems of chemical corrosion and mechanical deformation that are prone to occur in traditional grouting pipes in silty sand strata. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the rigid pipe section structure of this utility model; Figure 3 This is a schematic diagram of the flexible pipe section structure of this utility model; Figure 4 This is a cross-sectional view of the flexible pipe section structure of this utility model; Figure 5 This is an enlarged view of structure A of this utility model.

[0018] In the picture: 1. Multi-section grouting pipe, 101. Rigid pipe section, 102. Flexible pipe section, 1021. Silicone membrane, 1022. Carbon fiber reinforcement layer, 103. Flange, 104. Quick-release clamp, 105. Grouting hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-5 This utility model provides a technical solution: a layered grouting reinforcement device for silty sand foundation, including a multi-section grouting pipe 1. The multi-section grouting pipe 1 adopts a modular design, consisting of a detachable rigid pipe section 101 and a flexible pipe section 102, which are alternately assembled through flanges 103 and quick-release clamps 104. Additional pipe sections can be added or removed according to different foundation grouting depths, improving applicability, saving time and labor, and facilitating layered grouting at different depths. The rigid pipe section 101 is made of 45# steel, with standard flanges 103 welded to both ends. The flexible pipe section 102 also has standard flanges 103 welded to both ends, and they are alternately assembled through quick-release clamps 104. The quick-release clamps 104 are existing technology, using a grooved clamp form to facilitate the fixed connection between flanges 103. Sealing rings can be installed at the pipe section connections to achieve sealing and waterproofing performance. Meanwhile, one end of the multi-section grouting pipe 1 is connected to the existing grouting transmission pipe through a pipe conversion joint and is equipped with an electromagnetic flow meter, while the other end is connected to the existing drill bit for the bottom drilling process. Grouting holes 105 are provided on the pipe wall of the multi-section grouting pipe 1, and grouting operations of different layers are realized through the grouting holes 105.

[0021] It should be noted that, according to the prior art, a tension fixing barrier is set between adjacent grouting holes 105 (see patent number CN214832577U). By adjusting the opening and closing of the tension fixing barrier, layered grouting can be performed.

[0022] Specifically, the grouting holes 105 are arranged in a ring array, and the axial spacing between adjacent hole groups is 15-20cm. This spacing design ensures uniform penetration of the grout into the silty sand layer. Figure 5 As shown, the grouting hole 105 adopts a stepped aperture design. The inner aperture is 5mm, used in the initial stage of high-pressure grouting, when the grout viscosity is high and precise control of the grouting pressure is required. The outer aperture is 8mm, used in the grout diffusion stage. Enlarging the aperture reduces flow resistance and promotes radial penetration of the grout. This dual-aperture structure allows the inner small aperture to form an initial jet to enhance grout penetration, while the outer large aperture achieves uniform diffusion of the grout in the pores of the silt through the Bernoulli effect. Preferably, the hole wall is electrolytically polished to achieve a surface finish of Ra0.8μm, effectively reducing the boundary layer effect during grout flow. A pressure-triggered grouting channel can be formed by combining the grouting hole 105 with a medical-grade silicone one-way valve (not shown in the figure, representing existing technology), effectively preventing grout backflow.

[0023] Specifically, the flexible pipe section 102 adopts an innovative double-layer composite structure design, which is a double-layer corrugated pipe structure. The outer layer is a precision-formed corrugated pipe substrate, covered with a 2mm thick corrosion-resistant silicone film 1021. This film layer is treated with a vulcanization process and has excellent acid and alkali resistance, maintaining structural integrity in highly corrosive slurry environments with pH 3-11. The inner layer uses a prepreg process to embed a 0.5mm thick carbon fiber reinforcement layer 1022, forming a three-dimensional reinforcement network through orthogonal fiber arrangement. This allows the pipe section to maintain its flexibility while achieving an axial compressive strength of over 8MPa and a 40% increase in radial deformation resistance. This structural design effectively solves the problems of chemical corrosion and mechanical deformation that easily occur in traditional grouting pipes in silty sand strata.

[0024] In this embodiment, the device is used only as the grouting pipe in a complete grouting system. The rigid pipe section is fixed to the existing grout delivery pipe using flanges and clamps, while the other end is connected to a flexible pipe section via clamps. The number of flexible pipe sections installed alternately is selected based on the depth of the grouting foundation to improve applicability, save time and labor, and facilitate layered grouting at different depths. Simultaneously, the stepped aperture design of the grouting holes ensures uniform diffusion of the grout in the pores of the silty sand. The flexible pipe section employs an innovative double-layer composite structure design, effectively solving the problems of chemical corrosion and mechanical deformation that easily occur with traditional grouting pipes in silty sand strata. According to existing technology, after the target area is treated, the grouting hole corresponding to that target stratum is closed, and the grouting hole corresponding to another target soil layer is opened. All the above grouting operation steps are repeated until the grouting treatment of the entire target area is completed.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A layered grouting reinforcement device for silty sand foundation, comprising a multi-section grouting pipe (1), characterized in that: The multi-section grouting pipe (1) is assembled alternately by a detachable rigid pipe section (101) and a flexible pipe section (102) through a flange (103) and a quick-release clamp (104), and grouting holes (105) are provided on the pipe wall of the multi-section grouting pipe (1).

2. The layered grouting reinforcement device for silty sand geological foundation according to claim 1, characterized in that: The grouting holes (105) are arranged in a ring array, and the axial spacing between adjacent hole groups is 15-20cm.

3. The layered grouting reinforcement device for silty sand geological foundation according to claim 1, characterized in that: The flange (103) is located at both ends of the rigid pipe section (101) and the flexible pipe section (102).

4. The layered grouting reinforcement device for silty sand foundation according to claim 1, characterized in that: The quick-release clamp (104) is installed on the flange (103) adjacent to the pipe section to achieve a fixed connection.

5. The layered grouting reinforcement device for silty sand geological foundation according to claim 4, characterized in that: The grouting hole (105) adopts a stepped hole diameter design, with an inner hole diameter of 3-5mm and an outer hole diameter of 6-8mm.

6. The device for silt geology foundation layer grouting reinforcement according to claim 1, characterized in that: The flexible pipe section (102) has a double-layer corrugated pipe structure, with the outer layer covered by a 1-2 mm thick corrosion-resistant silicone film (1021) and the inner layer embedded with a 0.3-0.5 mm thick carbon fiber reinforcement layer (1022).

7. The device for silt geology foundation layer grouting reinforcement according to claim 1, characterized in that: The rigid pipe section (101) is made of No. 45 steel.

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