Stable reinforcing structure for soil body foundation in soft soil area
By arranging a prestressed concrete anchoring reinforcement system at an angle in soft soil, combined with enlarged head anchor cables and double grouting technology, the construction difficulties of traditional anchor cables in soft soil were solved, and the stability and bearing capacity of soft soil were improved.
Patent Information
- Application Number
- CN202520465606.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-17
AI Technical Summary
Traditional anchor cables are difficult to adapt to geological conditions when installed in soft soil, leading to anchor cable failure or unsatisfactory reinforcement effects. Furthermore, the density and uniformity of grouting are difficult to control, which cannot effectively improve the bearing capacity and stability of soft soil.
A prestressed concrete anchoring reinforcement system is adopted, which includes multiple prestressed concrete reinforcement anchor cables arranged at an angle, combined with enlarged head anchor cables, overhead wire rings and stirrup rings. Through double grouting technology and casing drilling technology, the anchoring performance and soil stability are improved.
It significantly improves the bearing capacity and stability of soft soil, enhances anchoring performance, and improves construction efficiency and safety, making it suitable for engineering construction under complex geological conditions.
Smart Images
Figure CN223867233U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a stable and reinforced structure, and more particularly to a stable and reinforced structure for soil foundations in soft soil areas, belonging to the field of civil engineering structure design and construction technology. Background Technology
[0002] Soft soil is characterized by low bearing capacity, high compressibility, and low shear strength, making it prone to problems such as borehole collapse and poor anchoring during construction. Traditional anchoring methods, which involve directly drilling holes in soft soil, placing anchors, and injecting cement grout, are often unsuitable for the geological conditions of soft soil, leading to anchor failure or unsatisfactory reinforcement. Furthermore, the density and uniformity of grouting in existing technologies are difficult to control, resulting in weak overall performance of the anchored section. This fails to adequately strengthen the soft soil, thus failing to improve its bearing capacity, and the stability of the soft soil itself needs further improvement. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a stabilizing and strengthening structure for soil foundations in soft soil areas that can effectively improve the bearing capacity of soft soil and enhance its own stability.
[0004] The technical solution adopted to solve the above-mentioned technical problems is: a stable and reinforced structure for soil foundations in soft soil areas, including soft soil, and the stable and reinforced structure also includes a prestressed concrete anchoring reinforcement system, which is evenly distributed at an incline in the soft soil; the stability and bearing capacity of the soft soil are improved and enhanced with the cooperation of the prestressed concrete anchoring reinforcement system.
[0005] Furthermore, the prestressed concrete anchoring reinforcement system includes multiple prestressed concrete reinforcing anchor cables, each of which is cast in place at an angle in the corresponding position of the soft soil through a corresponding casing drilling hole.
[0006] The preferred embodiment of the above scheme is that each prestressed concrete reinforced anchor cable includes a free section and a prestressed anchoring section along its length from the outside to the inside. The free sections of each prestressed concrete reinforced anchor cable are respectively arranged in the casing drill hole at the corresponding shallow surface position of the soft soil. The prestressed anchoring sections of each prestressed concrete reinforced anchor cable are respectively arranged at the corresponding positions of the corresponding casing drill hole. Except for the shallow surface soft soil, the stability and bearing capacity of other soft soil are improved by the prestressed anchoring sections of each prestressed concrete reinforced anchor cable.
[0007] Furthermore, each prestressed concrete reinforced anchor cable includes an anchor cable body and a cast-in-place concrete body. Each anchor cable body is embedded in the corresponding cast-in-place concrete body and prestress is applied to the cast-in-place concrete body.
[0008] The preferred embodiment of the above scheme is that each anchor cable body is an enlarged head anchor cable body, and the tip of the cast-in-place concrete body also has an enlarged cast-in-place concrete anchor head, with the enlarged end of the enlarged head anchor cable body embedded in the cast-in-place concrete anchor head.
[0009] Furthermore, each prestressed concrete reinforced anchor cable also includes at least two sets of overhead wire rings and at least one stirrup ring. The overhead wire rings are arranged on the corresponding anchor cable body at intervals of 1.9-2.1 meters along the length direction. Each anchor cable body between each two adjacent overhead wire rings is reinforced with at least one stirrup ring. Each anchor cable body is expanded by the corresponding sets of overhead wire rings to increase its cross-sectional area. The expanded anchor cable bodies are stabilized by the corresponding stirrup rings. The cast-in-place concrete body covers each expanded anchor cable body.
[0010] The preferred embodiment of the above scheme is that the cast-in-place concrete body includes a primary grouting body and a secondary grouting body, the cast-in-place concrete anchor head is the primary grouting body, and the cast-in-place concrete body other than the cast-in-place concrete anchor head is the secondary grouting body.
[0011] Furthermore, the grouting material is a pure cement grout.
[0012] The preferred method of the above scheme is that at least one grouting body is evenly distributed on the hole wall at the root of the casing drilling hole.
[0013] Furthermore, each anchor cable body is composed of steel strands, and the free section of the prestressed concrete reinforced anchor cable is composed of the free section of steel strands. Each free section of the steel strands is fitted with a plastic protective tube, and the steel strands inside the plastic protective tubes are coated with an anti-corrosion grease layer; guide caps are also installed on the steel strands located outside the soft soil.
[0014] The beneficial effects of this utility model are as follows: The technical solution provided in this application is based on existing soft soil. By adding a prestressed concrete anchoring reinforcement system, a stable and reinforced structure is constructed, and the prestressed concrete anchoring reinforcement system is evenly distributed at an angle within the soft soil. Then, the stability and bearing capacity of the soft soil are improved and enhanced with the cooperation of the prestressed concrete anchoring reinforcement system. In this way, because the prestressed concrete anchoring reinforcement system, which is evenly distributed at an angle within the soft soil, crowds out the soft soil itself and simultaneously reinforces the soft soil through a network, it not only effectively improves the bearing capacity of the weak soil but also significantly enhances its own stability. Attached Figure Description
[0015] Figure 1 This utility model relates to the arrangement and structural diagram of a single prestressed concrete reinforced anchor cable for the stabilization and reinforcement structure of soil foundations in soft soil areas. It also serves as a tensioning and locking diagram for the final stage of construction.
[0016] Figures 2-5 This utility model relates to a schematic diagram of the construction process of a single prestressed concrete reinforced anchor cable for the stabilization and reinforcement structure of soil foundation in soft soil areas. The diagram shows the steps of pipe drilling, steel strand placement, two grouting operations, and steel pipe extraction.
[0017] The markings in the diagram are: 1. Soft soil, 2. Pipe drilling hole, 3. Free section, 4. Prestressed anchorage section, 5. Stringing ring, 6. Stirrup ring, 7. Guide cap, 8. Anchor cable body. Detailed Implementation
[0018] like Figures 1-5 This invention illustrates a stabilizing and reinforcing structure for foundations in soft soil areas, which effectively improves the bearing capacity and enhances the stability of soft soil. The stabilizing and reinforcing structure includes a soft soil mass 1 and a prestressed concrete anchoring reinforcement system, which is evenly distributed at an angle within the soft soil mass 1. The stability and bearing capacity of the soft soil mass 1 are improved and enhanced with the assistance of the prestressed concrete anchoring reinforcement system. The technical solution provided in this application is based on existing soft soil, and the stabilizing and reinforcing structure is constructed by adding a prestressed concrete anchoring reinforcement system, which is evenly distributed at an angle within the soft soil mass. The stability and bearing capacity of the soft soil mass are then improved and enhanced with the assistance of the prestressed concrete anchoring reinforcement system. Thus, because the evenly distributed prestressed concrete anchoring reinforcement system in the soft soil mass crowds out the soft soil mass itself and simultaneously reinforces it through a network, it not only effectively improves the bearing capacity of the soft soil but also significantly enhances its own stability.
[0019] Accordingly, considering the existing technology, and for ease of construction, the prestressed concrete anchoring reinforcement system of this application includes multiple prestressed concrete reinforcing anchor cables. Each prestressed concrete reinforcing anchor cable is cast-in-place at a corresponding position in the soft soil 1 through a corresponding casing drill hole 2. Furthermore, considering the actual construction conditions, each prestressed concrete reinforcing anchor cable of this application includes a free section 3 and a prestressed anchoring section 4 along its length from the outside in. The free sections 3 of each prestressed concrete reinforcing anchor cable are respectively arranged in the casing drill hole 2 at the corresponding shallow surface position of the soft soil, and the prestressed anchoring sections 4 of each prestressed concrete reinforcing anchor cable are respectively arranged at the corresponding positions in the corresponding casing drill hole 2. Except for the shallow surface soft soil, the stability and bearing capacity of other soft soil masses 1 are improved through the prestressed anchoring sections 4 of each prestressed concrete reinforcing anchor cable. More specifically, each prestressed concrete reinforced anchor cable includes an anchor cable body 8 and a cast-in-place concrete body. Each anchor cable body 8 is embedded in the corresponding cast-in-place concrete body and prestresses the cast-in-place concrete body.
[0020] Furthermore, to improve the load-bearing capacity of each prestressed concrete reinforced anchor cable and its bonding ability with the soft soil 1, the anchor cable body 8 of this application is an enlarged head anchor cable body, and the tip of the cast-in-place concrete body also has an enlarged cast-in-place concrete anchor head, with the enlarged end of the enlarged head anchor cable body embedded in the cast-in-place concrete anchor head. Simultaneously, each prestressed concrete reinforced anchor cable of this application also includes at least two sets of overhead wire rings 5 and at least one stirrup ring 6. The overhead wire rings 5 are arranged at intervals of 1.9-2.1 meters along the length direction on the corresponding anchor cable body 8. At least one stirrup ring 6 is attached to each anchor cable body 8 between each two adjacent overhead wire rings 5. Each anchor cable body 8 is expanded and its cross-sectional area is increased by the corresponding sets of overhead wire rings, and the expanded anchor cable bodies 8 are stabilized by the corresponding stirrup rings 6. The cast-in-place concrete body covers each expanded anchor cable body 8.
[0021] Accordingly, in the specific construction process, the cast-in-place concrete body of this application includes a primary grouting body and a secondary grouting body. The cast-in-place concrete anchor head is the primary grouting body, and the cast-in-place concrete body other than the cast-in-place concrete anchor head is the secondary grouting body. The primary grouting body is a pure cement grout. The primary grout is evenly distributed on the hole wall at least at the base of the casing drill hole. Furthermore, each anchor cable body 8 of this application is composed of steel strands, and the free section 3 of the prestressed concrete reinforced anchor cable is composed of the free section of steel strands. A plastic protective tube is sleeved on the free section of each steel strand, and an anti-corrosion grease layer is applied to the steel strand inside the plastic protective tube; a guide cap 7 is also installed on the steel strand located outside the soft soil 1.
[0022] In summary, the technical solution provided in this application also has the following advantages:
[0023] 1. The drilling stability is significantly improved. The use of casing drilling technology effectively solves problems such as borehole collapse, insufficient anchorage strength, and low construction efficiency in soft soil, ensuring the stability of the drilling process and making it suitable for construction environments with complex geological conditions.
[0024] 2. Significantly improved anchoring performance: The use of enlarged head anchor cables, stringing rings, and stirrup rings increases the stress-bearing area of the anchoring section, significantly improving the strength and pull-out resistance of the anchor cable itself, ensuring the reliability and long-term effectiveness of the anchor cable in soft soil layers. The double grouting technology not only improves the density of the grouting material but also optimizes the strength distribution of the anchor body, resulting in superior anchoring performance.
[0025] 3. Construction efficiency is significantly improved. The optimized construction process, combined with casing drilling and double grouting technology, shortens the construction cycle, improves operational efficiency, and greatly enhances the construction quality and reliability of anchor cables. It is particularly suitable for projects with strict time requirements.
[0026] 4. Enhanced durability and reliability: The free section of the steel strand is protected by a grease coating and plastic tubing, effectively preventing corrosion and fatigue damage and extending the service life of the anchor cable. The sealing treatment ensures the long-term reliability of the anchor cable under load.
[0027] 5. Wide applicability: This method is applicable to various engineering scenarios in soft soil, including slope reinforcement, foundation pit support and foundation reinforcement. It not only solves the adaptability problem of traditional construction technology in soft soil, but also shows significant advantages in terms of project quality and economic benefits.
[0028] 6. Improved project safety: By precisely controlling the drilling, grouting, and tensioning processes, uncertainties and risks during construction are reduced, thereby improving the overall safety and quality stability of the construction.
[0029] The technical solution of this application will be further described below through specific embodiments:
[0030] Example 1
[0031] The purpose of this application is to provide a prestressed anchor cable construction method suitable for soft soil, which effectively solves problems such as borehole collapse, insufficient anchorage strength, and low construction efficiency in soft soil construction.
[0032] The specific technical solutions include the following points:
[0033] 1. Casing drilling technology
[0034] Using a casing drilling rig to simultaneously advance the drill rod and casing ensures the stability of the borehole in soft soil and prevents borehole collapse. Casing drilling is suitable for deep and large-diameter boreholes in soft soil, ensuring that the borehole quality meets design requirements.
[0035] 2. Anchor cable optimization design and installation
[0036] 1) Anchorage Section: Within the anchorage section, a wire-laying ring is installed every 2 meters, with a stirrup ring tied between each two rings to enhance the structural stability of the anchor cable. Enlarged-head anchor cables are used to increase the stress-bearing area of the anchor body, thereby improving the pull-out resistance and load-bearing capacity of the anchorage section.
[0037] 2) Free section: The free section of steel strand is protected by plastic tubes and coated with grease for corrosion prevention. Guide caps are installed at the ends to facilitate installation.
[0038] 3. Double grouting technology
[0039] 1) Single grouting: Pure cement grout with a strength of M30 is injected into the bottom of the hole, and the grouting pressure is controlled at 0.4MPa to ensure that the grout fills the hole wall of the anchoring section evenly.
[0040] 2) Secondary grouting: Secondary grouting is carried out after the initial setting and before the final setting of the first grouting (usually 1-2 hours later). The grouting pressure is increased to 2.2-2.8MPa to further improve the compactness and strength of the anchoring section.
[0041] 4. Anchor cable tensioning and locking
[0042] After the cement strength of the anchorage section reaches 75% of the design strength, the anchor cable is tensioned, the design prestress value is applied, and the anchor cable is locked. After three days of observation, excess steel strands are cut off and the anchor cable is sealed to ensure its long-term reliability.
[0043] The above technical solutions effectively overcome the construction difficulties of traditional methods in soft soil layers, and significantly improve construction efficiency and anchoring quality.
Claims
1. A stabilizing and reinforcing structure for foundations in soft soil areas, including loose soil (1), characterized in that: The aforementioned stabilizing and reinforcing structure also includes a prestressed concrete anchoring reinforcement system, which is inclined and evenly distributed in the soft soil (1); the stability and bearing capacity of the soft soil (1) are improved and enhanced with the cooperation of the prestressed concrete anchoring reinforcement system.
2. The stabilizing and reinforcing structure for soil foundations in soft soil areas according to claim 1, characterized in that: The prestressed concrete anchoring reinforcement system includes multiple prestressed concrete reinforcing anchor cables, each of which is cast in place at the corresponding position in the soft soil (1) through a corresponding casing drilling hole (2).
3. The stabilizing and reinforcing structure for soil foundations in soft soil areas according to claim 2, characterized in that: Each prestressed concrete reinforced anchor cable includes a free section (3) and a prestressed anchoring section (4) along its length from the outside to the inside. The free sections (3) of each prestressed concrete reinforced anchor cable are respectively arranged in the casing drilling holes (2) at the corresponding shallow soft soil layer. The prestressed anchoring sections (4) of each prestressed concrete reinforced anchor cable are respectively arranged at the corresponding positions of the corresponding casing drilling holes (2). The stability and bearing capacity of other soft soil layers (1) except for the shallow soft soil layer are improved by the prestressed anchoring sections (4) of each prestressed concrete reinforced anchor cable.
4. The stabilizing and reinforcing structure for soil foundations in soft soil areas according to claim 2 or 3, characterized in that: Each prestressed concrete reinforced anchor cable includes an anchor cable body (8) and a cast-in-place concrete body. Each anchor cable body (8) is embedded in the corresponding cast-in-place concrete body and prestress is applied to the cast-in-place concrete body.
5. The stabilizing and reinforcing structure for soil foundations in soft soil areas according to claim 4, characterized in that: Each anchor cable body (8) is an enlarged head anchor cable body, and the tip of the cast-in-place concrete body also has an enlarged cast-in-place concrete anchor head. The enlarged end of the enlarged head anchor cable body is embedded in the cast-in-place concrete anchor head.
6. The stabilizing and reinforcing structure for soil foundations in soft soil areas according to claim 5, characterized in that: Each prestressed concrete reinforced anchor cable also includes at least two sets of overhead wire rings (5) and at least one stirrup ring (6). The overhead wire rings (5) are arranged on the corresponding anchor cable body (8) with a spacing of 1.9-2.1 meters between each other along the length direction. Each anchor cable body (8) between each two adjacent overhead wire rings (5) is tied with at least one stirrup ring (6). Each anchor cable body (8) is opened up by the corresponding sets of overhead wire rings to increase its cross-sectional area. The opened anchor cable bodies (8) are stabilized by the corresponding stirrup rings (6). The cast-in-place concrete body covers each opened anchor cable body (8).
7. The stabilizing and reinforcing structure for soil foundations in soft soil areas according to claim 6, characterized in that: Cast-in-place concrete bodies include primary grouting bodies and secondary grouting bodies. Cast-in-place concrete anchor heads are primary grouting bodies, while cast-in-place concrete bodies other than the primary grouting bodies are secondary grouting bodies.
8. The stabilizing and reinforcing structure for soil foundations in soft soil areas according to claim 7, characterized in that: The primary grouting body is a pure cement grout.
9. The stabilizing and reinforcing structure for soil foundations in soft soil areas according to claim 8, characterized in that: At least one layer of grout is evenly distributed on the hole wall at the root of the casing drilling hole.
10. The stabilizing and reinforcing structure for soil foundations in soft soil areas according to claim 3, characterized in that: Each anchor cable body (8) is made of steel strands. The free section (3) of the prestressed concrete reinforced anchor cable is made of the free section of steel strands. Each free section of steel strands is fitted with a plastic protective tube. The steel strands inside the plastic protective tube are coated with an anti-corrosion grease layer. A guide cap (7) is also installed on the steel strands located outside the soft soil (1).