Anchoring device capable of actively regulating and controlling anchor rod stress and enclosure deformation and implementation method

Abstract

The invention discloses an anchoring device capable of actively regulating and controlling anchor rod stress and enclosure deformation and an implementation method, the anchoring device comprises an anchor rod, the outer end of the anchor rod is provided with an openable hook, and the anchor rod is arranged perpendicular to an enclosure structure and penetrates through an enclosure structure gap to be inserted into a soil body; the enclosure structure is a row pile, a steel pile or a profile steel structure arranged along the contour line of the foundation pit; and the recyclable profile steel anchoring piles are arranged in pairs. According to the anchoring device capable of actively regulating and controlling the anchor rod stress and the enclosure deformation and the implementation method, the anchoring device capable of actively regulating and controlling the anchor rod stress and the enclosure deformation can dynamically regulate and control the axial force of the anchor rod in real time through a control system and a hydraulic jack in the construction period; and meanwhile, the tensile bearing capacity of the anchor rod can be greatly improved through the recyclable profile steel anchoring pile on the outer side of the protected object, the counter force borne by the enclosure structure can be dynamically adjusted in real time according to the development condition of enclosure deformation, the aim of accurately controlling enclosure deformation is achieved, and disturbance of foundation pit construction to the surrounding environment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, and in particular to an anchoring device capable of actively regulating anchor stress and enclosure deformation and an implementation method thereof. Background Art

[0002] Excavation of foundation pits will cause stress release in the surrounding rock and soil, resulting in surface settlement, soil displacement and other phenomena. Therefore, foundation pit construction must control the deformation of the enclosure according to the surrounding environmental conditions to prevent excessive deformation from endangering the safety of facilities in the surrounding environment. Anchor rods are common foundation pit support structures. Traditional anchor rods will be directly locked after the prestress is in place. The anchor rods and the enclosure structure are in a locked connection state. The prestress will no longer be adjusted according to the deformation in the subsequent construction stage.

[0003] Since the prestress of traditional anchor rods is no longer dynamically adjusted after tensioning, if the retaining structure deforms too much during the subsequent construction phase, the traditional anchor rods will not be able to provide a greater reaction force to the retaining structure by active loading, which is very detrimental to the environmental protection around the foundation pit.

[0004] The tensile bearing capacity of traditional anchor rods is limited by the friction between the grouting anchor body and the soil, which cannot give full play to the tensile strength of the anchor rod itself. The anchor tension reaction value of the anchor rod on the retaining structure is low, which is also very unfavorable to control the deformation of the retaining structure.

[0005] In response to the above problems, existing technologies attempt to improve anchoring performance by optimizing anchor structure (such as enlarging head anchor) or improving grouting technology (such as secondary splitting grouting), but they still cannot break through the inherent limitations of passive anchoring. In recent years, some projects have adopted detachable anchors to achieve rod recovery, but their adjustment mechanism is still limited to the initial stage of prestressing, and a real-time coupling control system with enclosure deformation has not been established. Therefore, the development of a high-performance anchoring system with active regulation capabilities that can fully utilize the strength of materials has become an important research direction for improving the safety and environmental friendliness of deep foundation pit projects. Summary of the invention

[0006] The purpose of the present invention is to provide an anchoring device and an implementation method that can actively regulate anchor stress and enclosure deformation, so as to solve the problem proposed in the above background technology that the enclosure structure may produce excessive deformation due to insufficient anchoring reaction force. At this time, the traditional anchor system lacks active reinforcement capability, which is very likely to cause safety accidents in the surrounding environment.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solution: an anchoring device capable of actively regulating anchor stress and monitoring surrounding deformation, comprising:

[0008] An anchor rod, with an expandable hook at its outer end, is arranged perpendicular to the retaining structure and inserted into the soil through the gap of the retaining structure;

[0009] The retaining structure is a row of piles, steel piles or steel structures arranged along the contour of the foundation pit;

[0010] Recyclable steel anchor piles are arranged in pairs, parallel to the enclosure structure and outside the protected object, with each group of anchor piles corresponding to one anchor rod position;

[0011] The perimeter purlin is made of double H-shaped steel welded in parallel, fixed to the enclosure structure through a steel bracket and provided with a reserved hole;

[0012] Steel chuck, welded and fixed to the enclosure structure, including curved plates, vertical stiffening plates, transverse ribs and cross plates;

[0013] Hydraulic jack, set between the steel chuck and the purlin;

[0014] Monitoring system, including anchor stress monitoring, enclosure deformation monitoring and surrounding environment monitoring devices;

[0015] The control system connects the monitoring system and the hydraulic jack to achieve dynamic adjustment of the jacking force.

[0016] Preferably, the retaining structure is made of any one of row piles, steel sheet piles or steel piles.

[0017] Preferably, the recyclable steel anchor piles are H-shaped steel or steel pipe piles, two piles are arranged in each group and the spacing is such that the anchor rods can pass through.

[0018] Preferably, the anchor rod is made of steel pipe, steel bar or steel strand, and its hook passes through the anchor pile and then opens to form a mechanical lock.

[0019] Preferably, the spacing of the reserved holes of the purlin matches the spacing of the anchor rods, and the anchor rods are fixed by the lock buckle.

[0020] Preferably, the hydraulic jack is arranged at intervals from the anchor rod, and the top force control range satisfies the conditions of F0<F1<0.8Fmax. Anchoring device and implementation method that can actively regulate anchor rod stress and enclosure deformation

[0021] Preferably, the monitoring system includes a stress sensor embedded in the anchor rod, a displacement monitoring device installed in the enclosure structure, and a deformation monitoring device for surrounding buildings.

[0022] Preferably, an anchoring device and implementation method capable of actively regulating anchor stress and enclosure deformation comprises the following steps:

[0023] Step 1: Construct the enclosure structure and recyclable steel anchor piles simultaneously;

[0024] Step 2: During the layered excavation process, anchor rods are installed as needed, and after being fixed by grouting, graded tensioning is performed;

[0025] Step 3: Dynamically adjust the hydraulic jack force according to real-time monitoring data, and increase the force to F1 when the deformation exceeds the limit;

[0026] Step 4: After the foundation pit is completed, the anchor piles are recovered and grouting backfill is implemented

[0027] Preferably, the first jacking force F0 applied by the hydraulic jack is 60-70% of the design value, and the warning jacking force F1 does not exceed 0.8 times the ultimate bearing capacity Fmax of the anchor rod. The anchoring device and implementation method can actively regulate the anchor rod stress and the enclosure deformation.

[0028] Preferably, when installing the anchor rod, an unopened hook is first inserted, and then opened and locked to the anchor pile after grouting is completed.

[0029] Compared with the prior art, the beneficial effects of the present invention are: the anchoring device and implementation method that can actively adjust the anchor stress and the enclosure deformation, the anchoring device that can actively adjust the anchor stress and the enclosure deformation, can perform real-time dynamic regulation of the anchor axial force through a control system and a hydraulic jack during construction, and at the same time can utilize the recyclable steel anchor piles on the outside of the protected object to greatly improve the tensile bearing capacity of the anchor, and can dynamically adjust the reaction force exerted on the enclosure structure in real time according to the development of the enclosure deformation, so as to achieve the purpose of accurately controlling the enclosure deformation and reduce the disturbance of the foundation pit construction to the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the plane layout of the present invention;

[0031] Figure 2 It is a schematic diagram of the cross-sectional arrangement of the present invention;

[0032] Figure 3 It is a schematic diagram of the purlin of the present invention;

[0033] Figure 4 It is a schematic diagram of the steel chuck of the present invention.

[0034] In the figure: 1. Anchor rod; 12. Hook; 2. Enclosure structure; 3. Purlin; 31. Stiffening rib; 32. Reserved hole; 4. Recyclable steel anchor pile; 5. Hydraulic jack; 6. Lock; 7. Steel chuck; 71. Arc plate; 72. Vertical stiffening plate; 73. Transverse rib plate; 74. Transverse plate; 8. Steel bracket. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figure 1-4 The present invention provides a technical solution: an anchoring device capable of actively regulating anchor stress and enclosure deformation, comprising:

[0037] An anchor rod 1, with an expandable hook 12 at its outer end, is arranged perpendicular to the enclosure structure 2 and inserted into the soil through the gap of the enclosure structure. The anchor rod 1 is made of steel pipe, steel bar or steel strand, and its hook 12 is opened after passing through the anchor pile to form a mechanical lock;

[0038] The retaining structure 2 is a row of piles, steel piles or steel structures arranged along the contour of the foundation pit. The retaining structure 2 is any one of the row of piles, steel sheet piles or steel piles;

[0039] Recyclable steel anchor piles 4 are arranged in pairs, parallel to the enclosure structure 2 and arranged outside the protected object, each group of anchor piles corresponds to an anchor rod 1 position, and the recyclable steel anchor piles 4 are made of H-shaped steel or steel pipe piles, two are arranged in each group and the spacing allows the anchor rod 1 to pass through;

[0040] The purlin 3 is formed by welding double H-shaped steel in parallel, fixed to the enclosure structure 2 through a steel bracket 8 and provided with a reserved hole 32. The spacing of the reserved holes 32 of the purlin 3 matches the spacing of the anchor rods 1, and the anchor rods are fixed in cooperation with the lock buckle 6;

[0041] The steel chuck 7 is welded and fixed on the enclosure structure 2, and comprises an arc plate 71, a vertical stiffening plate 72, a transverse rib plate 73 and a transverse plate 74;

[0042] The hydraulic jack 5 is arranged between the steel chuck 7 and the purlin 3. The hydraulic jack 5 is arranged at intervals from the anchor rod 1. The jacking force control range meets the conditions of F0<F1<0.8Fmax. The anchoring device and implementation method that can actively regulate the anchor rod stress and the enclosure deformation;

[0043] The monitoring system includes anchor stress monitoring, enclosure deformation monitoring and surrounding environment monitoring devices. The monitoring system includes a stress sensor buried in the anchor 1, a displacement monitoring device set in the enclosure 2 and a deformation monitoring device of surrounding buildings;

[0044] The control system is connected with the monitoring system and the hydraulic jack 5 to realize dynamic adjustment of the jacking force.

[0045] The implementation of this specific embodiment includes the following steps:

[0046] (1) constructing a retaining structure 2 along the excavation boundary and installing a deformation monitoring system for the retaining structure 2;

[0047] (2) constructing a recyclable steel anchor pile 4 outside the protected object;

[0048] (3) setting the deformation warning value of the enclosure structure 2 and the deformation warning value of the surrounding environmental protection object in the control system, and setting the warning value Fmax of the safety tension of the anchor rod 1;

[0049] (4) After excavation to the predetermined elevation, drill holes in the gaps between the retaining structures 2 and install anchor rods 1. The outer ends of the anchor rods 1 should extend beyond the recyclable steel anchor piles 4;

[0050] (5) The hook 12 is fixed to the outer end of the anchor rod 1, and the hook 12 passes through the anchor rod 1 and clamps the recyclable steel anchor pile 4;

[0051] (6) After the hook 12 is in place, grouting is performed in the drilled hole;

[0052] (7) Install the steel chuck 7, the purlin 3, the steel bracket 8, the hydraulic jack 5 and the control system;

[0053] (8) The inner end of the anchor rod 1 extends beyond the purlin 3. After the grouting reaches the required strength, the anchor rod 1 is tensioned for the first time and the anchor rod 1 is fixed to the purlin 3 using the lock buckle 6;

[0054] (9) The hydraulic jack 5 applies the jacking force F0 for the first time;

[0055] (10) Continue to dig downwards and monitor the deformation of the retaining structure 2 and the internal force of the anchor 1 in real time;

[0056] (11) When the deformation of the enclosure structure 2 or the deformation of the surrounding environmental protection object exceeds the warning value, the hydraulic jack 5 applies a top force F1 (F1>F0, and F1<0.8Fmax) to apply a larger reaction force to the enclosure structure 2 to reduce the deformation of the enclosure structure 2, thereby achieving the purpose of protecting the surrounding environmental objects.

[0057] (12) After the foundation pit is completed, the recyclable steel anchor piles 4 are removed, and the holes in the soil after the removal are filled with grouting.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anchoring device capable of actively regulating anchor stress and enclosure deformation, characterized in that: include: An anchor rod (1) is provided with an expandable hook (12) at its outer end, is arranged perpendicular to the retaining structure (2) and is inserted into the soil through the gap of the retaining structure; Retaining structure (2): piles, steel piles or steel structures arranged along the contour of the foundation pit; Recyclable steel anchor piles (4) are arranged in pairs and parallel to the enclosure structure (2) outside the protected object, and each group of anchor piles corresponds to an anchor rod (1) position; The enclosure purlin (3) is formed by welding double H-shaped steels in parallel, is fixed to the enclosure structure (2) through a steel bracket (8) and is provided with a reserved hole (32); The steel chuck (7) is welded and fixed on the enclosure structure (2), and comprises an arc-shaped plate (71), a vertical stiffening plate (72), a transverse rib plate (73) and a transverse plate (74); A hydraulic jack (5) is arranged between the steel chuck (7) and the purlin (3); Monitoring system, including anchor stress monitoring, enclosure deformation monitoring and surrounding environment monitoring devices; The control system is connected with the monitoring system and the hydraulic jack (5) to realize dynamic adjustment of the jacking force.

2. The anchoring device capable of actively regulating anchor stress and enclosure deformation according to claim 1, characterized in that: The enclosure structure (2) is selected from any one of row piles, steel sheet piles or profiled steel piles.

3. The anchoring device capable of actively regulating anchor stress and enclosure deformation according to claim 1, characterized in that: The recyclable steel anchor piles (4) are made of H-shaped steel or steel pipe piles, two of which are arranged in each group and the spacing is such that the anchor rod (1) can pass through.

4. The anchoring device capable of actively regulating anchor stress and enclosure deformation according to claim 1, characterized in that: The anchor rod (1) is made of a steel pipe, a steel bar or a steel strand, and its hook (12) is opened after passing through the anchor pile to form a mechanical lock.

5. The anchoring device capable of actively regulating anchor stress and enclosure deformation according to claim 1, characterized in that: The spacing of the reserved holes (32) of the purlin (3) matches the spacing of the anchor rods (1), and the anchor rods are fixed by cooperating with the lock buckles (6).

6. The anchoring device capable of actively regulating anchor stress and enclosure deformation according to claim 1, characterized in that: The hydraulic jack (5) and the anchor rod (1) are arranged at intervals, and the jacking force control range satisfies the conditions of F0<F1<0.8Fmax, and the anchoring device and implementation method can actively regulate the anchor rod stress and the surrounding deformation.

7. The anchoring device capable of actively regulating anchor stress and enclosure deformation according to claim 1, characterized in that: The monitoring system comprises a stress sensor buried in the anchor rod (1), a displacement monitoring device arranged on the enclosure structure (2), and a deformation monitoring device for surrounding buildings.

8. An implementation method of an anchoring device capable of actively regulating anchor stress and enclosure deformation, characterized in that: According to claims 1-7, the following steps are included; Step 1: synchronously construct the enclosure structure (2) and the recyclable steel anchor piles (4); Step 2: during the layered excavation process, anchor rods (1) are installed as needed, and after being fixed by grouting, staged tensioning is performed; Step 3: dynamically adjust the jacking force of the hydraulic jack (5) according to the real-time monitoring data, and increase the jacking force to F1 when the deformation exceeds the limit; Step 4: After the foundation pit is completed, the anchor piles (4) are recovered and grouting backfill is performed.

9. The method for implementing the anchoring device capable of actively regulating anchor stress and enclosure deformation according to claim 8, characterized in that: The hydraulic jack (5) applies a first jacking force F0 of 60-70% of the design value, and the warning jacking force F1 does not exceed 0.8 times the ultimate bearing capacity Fmax of the anchor rod. The anchoring device and implementation method can actively regulate the anchor rod stress and the surrounding deformation.

10. The method for implementing the anchoring device capable of actively regulating anchor stress and enclosure deformation according to claim 8, characterized in that: When the anchor rod (1) is installed, the unopened hook (12) is first passed through, and then opened and locked to the anchor pile (4) after grouting is completed.

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