Fiber rubber concrete deep foundation pit slope protection structure
Patent Information
- Application Number
- CN202522058316.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-25
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-09-25
AI Technical Summary
然而，传统锚杆在富水松软地层中的锚固可靠性不足，在基坑开挖卸载或地下水渗流作用下，锚杆与土体间的界面易发生滑移，甚至被整体拔出，从而引发锚固失效，导致边坡失稳或坍塌事故，为此，本实用新型提出一种纤维橡胶混凝土深基坑护坡结构
[0014]本装置采用的掺有废旧橡胶颗粒和玄武岩纤维的混凝土浇筑纤维橡胶混凝土面板，橡胶颗粒的加入增强了混凝土的变形能力，有效吸收外部荷载引起的应力，而玄武岩纤维则进一步抑制了混凝土收缩和温度变化导致的微裂缝扩展，从而延长纤维橡胶混凝土面板的使用寿命，适用于复杂地质和富水环境下的深基坑工程；
Smart Images
Figure CN224799513U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of slope protection technology, specifically a fiber rubber concrete deep foundation pit slope protection structure. Background Technology
[0002] Deep foundation pit engineering is a crucial aspect of urban construction, and the safety and reliability of its support structure are of paramount importance. Currently, deep foundation pit slope protection often employs a combination of traditional concrete fiber-reinforced rubber panels and soil nails or anchor bolts.
[0003] In deep foundation pit support engineering, anchor bolt technology is widely used due to its economic efficiency. However, traditional anchor bolts lack sufficient anchoring reliability in water-rich and soft strata. Under the action of foundation pit excavation and unloading or groundwater seepage, the interface between the anchor bolt and the soil is prone to slippage, or even being pulled out entirely, thus causing anchoring failure and leading to slope instability or collapse. To address this, this utility model proposes a fiber-reinforced rubber concrete deep foundation pit slope protection structure. Utility Model Content
[0004] The purpose of this invention is to provide a fiber-reinforced rubber concrete deep foundation pit slope protection structure to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a fiber rubber concrete deep foundation pit slope protection structure, comprising a fiber rubber concrete panel, hollow anchor rods, and a drainage system; the fiber rubber concrete panel is made of concrete mixed with waste rubber particles and basalt fibers, and has a steel mesh inside; the anchor rods are steel rods with spiral anti-slip grooves on the rod body, and are anchored in the soil through a secondary grouting process; the drainage system includes a graded crushed stone filter layer set behind the fiber rubber concrete panel and a perforated corrugated pipe buried in the graded crushed stone filter layer; the slope protection structure is also equipped with a monitoring system, including fiber optic sensors fixed by metal threaded brackets.
[0006] Preferably, the fiber rubber concrete panel has flange edges for assembly and connection, and adjacent fiber rubber concrete panels are aligned by the flange edges and fixed together by bolts.
[0007] Preferably, the nodes of the steel mesh are fixed by binding wire.
[0008] Preferably, the grouting pipe used in the secondary grouting process is equipped with a check valve.
[0009] Preferably, the outer wall of the perforated corrugated pipe is provided with an annular buckle, which engages with the positioning frame in the graded crushed stone filter layer.
[0010] Preferably, the fiber optic sensor is used to monitor the displacement of the fiber-reinforced concrete panel.
[0011] Preferably, the hole diameter of the anchor bolt is matched with the drill rod of the rotary impact drilling rig.
[0012] Preferably, the metal threaded bracket is embedded in the inner surface of the fiber rubber concrete panel.
[0013] Compared with traditional technologies, the beneficial effects of this utility model are:
[0014] This device uses concrete mixed with waste rubber particles and basalt fibers to pour fiber rubber concrete panels. The addition of rubber particles enhances the deformation capacity of the concrete and effectively absorbs the stress caused by external loads, while basalt fibers further inhibit the expansion of microcracks caused by concrete shrinkage and temperature changes, thereby extending the service life of the fiber rubber concrete panels. It is suitable for deep foundation pit projects in complex geological and water-rich environments.
[0015] This device uses anchor rods with spiral anti-slip texture and combines them with secondary grouting process for anchoring, which improves the interfacial bonding force and pull-out resistance between the anchor rod and the soil. The spiral texture structure increases the interlocking effect between the anchor rod and the surrounding soil, while the secondary grouting further fills the voids in the hole wall and reinforces the soil, preventing the anchor rod from slipping or being pulled out under the conditions of foundation pit excavation and unloading or groundwater seepage, thereby enhancing the overall stability and safety of the slope.
[0016] This device uses the synergistic effect of graded crushed stone filter layer and perforated corrugated pipe to divert groundwater and reduce hydrostatic pressure; the pre-embedded fiber optic sensors can monitor the displacement changes of fiber rubber concrete panels in real time, and provide early warning of potential deformation and damage risks, providing data support and safety assurance for deep foundation pit construction and subsequent operation and maintenance. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0018] Figure 2 This is a schematic diagram of the drainage system structure of this utility model;
[0019] Figure 3 This is a schematic diagram of the steel mesh structure of this utility model;
[0020] Figure 4 This is a partial schematic diagram of the structure of the anchor bolt, perforated corrugated pipe, and fiber optic sensor in this practical application.
[0021] Figure 5 This is a schematic diagram of the structure of the grouting pipe connected to the anchor rod during grouting.
[0022] In the diagram: 1-Fiber rubber concrete panel; 2-Anchor bolt; 3-Drainage system; 4-Reinforcing mesh; 5-Spiral anti-slip texture; 6-Graded crushed stone filter layer; 7-Perforated corrugated pipe; 8-Metal threaded bracket; 9-Fiber optic sensor; 10-Flange edge; 11-Bolt; 12-Grouting pipe; 13-Check valve; 14-Ring buckle; 15-Positioning frame. Detailed Implementation
[0023] 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.
[0024] Example 1:
[0025] Please see Figures 1-5 The diagram illustrates a fiber-reinforced rubber concrete (FRP) deep foundation pit slope protection structure, comprising a FRP panel 1, hollow anchor rods 2, and a drainage system 3. The hollow anchor rods 2 facilitate subsequent secondary grouting. The FRP panel 1 is constructed from concrete mixed with waste rubber particles and basalt fibers. The rubber particles impart high elasticity and toughness to the concrete, effectively absorbing and dissipating the stress generated by the deformation of the foundation pit soil, reducing the risk of brittle cracking of the FRP panel 1. The basalt fibers act as reinforcing bars, evenly distributed within the concrete matrix, inhibiting plastic shrinkage and load cracking of the concrete matrix, thus improving the impact resistance, crack resistance, and durability of the FRP panel 1. The FRP panel 1 is internally reinforced with steel mesh 4, providing strong bending and tensile strength to ensure that the FRP panel 1 can withstand continuous pressure from the lateral soil of the foundation pit. The anchor rods 2 are steel rods with spiral anti-slip grooves 5 on their bodies and are anchored in the soil through a secondary grouting process to prevent the anchor rods 2 from being easily pulled out in soft soil layers.
[0026] The drainage system 3 includes a graded crushed stone filter layer 6 installed behind the fiber rubber concrete panel 1 and a perforated corrugated pipe 7 buried in the graded crushed stone filter layer 6. The perforated corrugated pipe 7 serves as an efficient main drainage channel, which orderly discharges the collected groundwater to the outside of the site, reduces the pore water pressure around the foundation pit, and alleviates the burden of hydrostatic pressure on the fiber rubber concrete panel 1.
[0027] The slope protection structure is also equipped with a monitoring system, including fiber optic sensors 9 fixed by metal threaded brackets 8. The metal threaded brackets 8 are pre-embedded in the inner surface of the fiber rubber concrete panel 1. The metal threaded brackets 8 ensure that the fiber optic sensors 9 are accurately positioned and do not slip during the concrete pouring and hardening process, and are well connected to the concrete, so as to continuously and reliably collect data, provide key information for assessing the structural status and warning of potential risks, and realize intelligent monitoring of the slope protection structure.
[0028] The following describes some embodiments of this application in detail with reference to the accompanying drawings:
[0029] Please see Figures 1-5 The fiber rubber concrete panel 1 used in this device is made of concrete mixed with waste rubber particles and basalt fiber. The addition of rubber particles enhances the deformation capacity of the concrete and effectively absorbs the stress caused by external loads, while basalt fiber further inhibits the expansion of microcracks caused by concrete shrinkage and temperature changes, thereby extending the service life of the fiber rubber concrete panel 1. It is suitable for deep foundation pit projects in complex geological and water-rich environments.
[0030] The fiber-reinforced concrete panel 1 has flange edges 10 for assembly and connection. Adjacent fiber-reinforced concrete panels 1 are aligned via the flange edges 10 and fixed together with bolts 11. During construction, operators only need to align the flange edges 10 of adjacent fiber-reinforced concrete panels 1 and then fix them together with bolts 11. This connection method not only ensures fast construction speed and high efficiency while maintaining assembly accuracy, but also forms a continuous retaining surface with good integrity, effectively and evenly transmitting and distributing earth pressure, and avoiding local instability caused by displacement of a single fiber-reinforced concrete panel 1. At the same time, this detachable connection method also provides convenience for local maintenance or replacement.
[0031] Meanwhile, the nodes of the steel mesh 4 are fixed by binding wire. Each intersection is tightened by binding wire manually or mechanically to ensure that the steel mesh 4 will not be misaligned or deformed during the concrete pouring and vibration process. This ensures that the steel mesh 4 can fully exert its tensile strength according to the design intention and jointly bear the load, which is the basis for ensuring the structural performance of the fiber rubber concrete panel 1.
[0032] Furthermore, the secondary grouting process employs a check valve 13 on the grouting pipe 12. The secondary grouting process is as follows: First, a hole is drilled in the soil using a rotary impact drill and an anchor rod 2 with spiral anti-slip texture 5 is inserted. Then, a first-stage atmospheric pressure grouting is performed, filling most of the voids in the hole to form an initial anchor body. After the primary grout has initially set, a second-stage high-pressure fracturing grouting is carried out through the pre-embedded grouting pipe 12. The specially designed check valve 13 on the grouting pipe 12 is a key component for achieving secondary grouting. It allows the grout to spray out of the pipe under high pressure, but effectively prevents mud or soil outside the hole from flowing back into the grouting pipe 12 after the pressure is released, thus avoiding pipe blockage and ensuring the reliability and effectiveness of the secondary grouting. Under high pressure, the grout fractures the primary grout and seeps into the surrounding soil fissures, forming a larger diameter, higher-strength composite anchor body that grips the surrounding soil, thereby increasing the anchoring force of the anchor rod 2.
[0033] It is worth noting that the hole diameter of anchor rod 2 is matched with the drill rod of rotary impact drilling rig. The hole diameter is designed according to the standard diameter of the selected drill rod and the construction process, aiming to form a drill hole of appropriate size and complete hole wall. This ensures that anchor rod 2 can be inserted smoothly and provides a sufficiently thick coating layer for grouting, thereby giving full play to the interlocking effect of spiral anti-slip texture 5 and grout and the bonding effect of grout and hole wall soil, ensuring the quality of final anchoring.
[0034] In this technical solution, the fiber optic sensor 9 is used to monitor the displacement of the fiber rubber concrete panel 1. By sensing the physical changes of light signals transmitted in the optical fiber, it can accurately measure the minute deformations and displacement trends of the fiber rubber concrete panel 1 at different positions along the depth direction in real time. It can promptly capture abnormal changes of the fiber rubber concrete panel 1 during the excavation and support of the foundation pit, providing the most direct data support for judging the stability of the slope.
[0035] The working principle of the device is as follows:
[0036] When lateral earth pressure from the foundation pit acts on the fiber-reinforced rubber concrete panel 1, the basalt fibers and waste rubber particles incorporated inside work together to improve the toughness, tensile strength, and crack resistance of the concrete. The fibers act as reinforcement, inhibiting the propagation of microcracks; the rubber particles give the concrete higher elastic deformation capacity, absorbing and dissipating stress, so that the fiber-reinforced rubber concrete panel 1 undergoes controllable micro-deformation under load rather than brittle cracking. The internal steel mesh 4 provides the main flexural strength, ensuring that the fiber-reinforced rubber concrete panel 1 will not suffer structural damage. At the same time, the fiber-reinforced rubber concrete panel 1 transmits the earth pressure it receives to the anchor rods 2 anchored behind it.
[0037] The spiral anti-slip texture 5 on the shaft of anchor rod 2 tightly interlocks with the grout body formed by the secondary grouting process, creating a strong mechanical interlock. The first grouting fills the voids in the hole, forming the initial anchor body; the second high-pressure grouting splits the grout body and penetrates into the surrounding soil, forming an anchor body with a larger diameter and higher strength, increasing the resistance and pull-out resistance between anchor rod 2 and the soil. At this point, anchor rod 2 can disperse the tensile force transmitted from fiber rubber concrete panel 1 into the deep stable soil, thereby reinforcing the soil around the foundation pit and forming a stable reinforced area.
[0038] Under the influence of soil pressure, groundwater seeps into the pit, first entering the graded crushed stone filter layer 6. This layer allows water to pass through but prevents fine soil particles from being carried away, thus preventing soil erosion. The water then enters the perforated corrugated pipe 7 through its openings and is guided to an external collection well for discharge. This process continuously lowers the groundwater level and pore water pressure within the pit slope, reducing the hydrostatic pressure acting on the fiber-reinforced concrete panel 1 and the soil, fundamentally improving the slope's stability.
[0039] The fiber optic sensor 9 is securely embedded inside the fiber rubber concrete panel 1 via a metal threaded bracket 8. It monitors the displacement changes of the fiber rubber concrete panel 1 in real time, converts the offset into optical signal data, and transmits it to the monitoring center. By analyzing this data, personnel can accurately grasp the stress and deformation state of the slope protection structure. Once the data exceeds the preset safety threshold, the system can issue an early warning to remind engineers to take timely reinforcement measures.
[0040] Example 2:
[0041] This embodiment is an optimization of the structure in Embodiment 1. Specifically, as follows: Figure 2 and Figure 4 As shown, the outer wall of the perforated corrugated pipe 7 is provided with an annular buckle 14, which engages with the positioning frame 15 in the graded crushed stone filter layer 6. This allows the perforated corrugated pipe 7 to be precisely fixed at the design elevation and position during the backfilling of graded crushed stone to form the graded crushed stone filter layer 6, preventing it from shifting, settling or deforming due to the impact and crushing of crushed stone. This ensures the continuity and unobstructed flow of the drainage channel and guarantees the long-term effective operation of the drainage system 3.
[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.
[0043] 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 fiber-reinforced rubber concrete deep foundation pit slope protection structure, comprising a fiber-reinforced rubber concrete panel (1), hollow anchor rods (2), and a drainage system (3); Its features are: The fiber rubber concrete panel (1) is made of concrete mixed with waste rubber particles and basalt fiber, and has a steel mesh (4) inside; the anchor rod (2) is a steel rod with spiral anti-slip texture (5) on the rod body, and is anchored in the soil through a secondary grouting process. The drainage system (3) includes a graded crushed stone filter layer (6) disposed behind the fiber rubber concrete panel (1) and a perforated corrugated pipe (7) embedded in the graded crushed stone filter layer (6); The slope protection structure is also equipped with a monitoring system, including an optical fiber sensor (9) fixed by a metal threaded bracket (8).
2. The fiber-reinforced rubber concrete deep foundation pit slope protection structure according to claim 1, characterized in that: The fiber rubber concrete panel (1) has a flange edge (10) for assembly and connection. Adjacent fiber rubber concrete panels (1) are aligned through the flange edge (10) and fixedly connected by bolts (11).
3. The fiber-reinforced rubber concrete deep foundation pit slope protection structure according to claim 1, characterized in that: The nodes of the steel mesh (4) are fixed by binding wire.
4. The fiber-reinforced rubber concrete deep foundation pit slope protection structure according to claim 1, characterized in that: The secondary grouting process uses a grouting pipe (12) equipped with a check valve (13).
5. The fiber-reinforced rubber concrete deep foundation pit slope protection structure according to claim 1, characterized in that: The outer wall of the perforated corrugated pipe (7) is provided with an annular buckle (14), which engages with the positioning frame (15) in the graded crushed stone filter layer (6).
6. The fiber-reinforced rubber concrete deep foundation pit slope protection structure according to claim 1, characterized in that: The fiber optic sensor (9) is used to monitor the displacement of the fiber rubber concrete panel (1).
7. The fiber-reinforced rubber concrete deep foundation pit slope protection structure according to claim 1, characterized in that: The hole diameter of the anchor rod (2) is adapted to the drill rod of the rotary impact drill.
8. The fiber-reinforced rubber concrete deep foundation pit slope protection structure according to claim 1, characterized in that: The metal threaded bracket (8) is embedded in the inner surface of the fiber rubber concrete panel (1).