Anchoring cable applied to deep foundation pit and construction method of deep foundation pit supporting anchoring cable

Abstract

The application provides an anchor cable applied to a deep foundation pit, which comprises a free section and an anchoring section, two ends of the anchoring section are connected with a group of free sections respectively, the free section and the anchoring section are arranged in a borehole, a supporting steel disc is arranged on the free section and the anchoring section, a supporting groove is formed in an edge surface of the supporting steel disc, a steel strand is arranged in the supporting groove, one end of the steel strand, which is away from the anchoring section, is fixedly connected with an anchor, a steel plate strip and a steel gasket are further arranged on the end of the anchor, which is away from the free section, a fixing ring is further arranged on the anchoring section, the anchor cable is constructed by pulling two adjacent deep foundation pits, the influence on the opposite anchor supporting system caused by the independent anchor construction of the two deep foundation pits is effectively avoided, the instability and insecurity of the deep foundation pit slope supporting system are avoided, the construction lag caused by the cross collision with other anchor cables is avoided, the overall stability and safety of the adjacent slope supporting system of the deep foundation pit are improved, and the anchor cable has high reliability and practicality.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support technology, specifically to an anchor cable applied to deep foundation pits and a construction method for the anchor cable for deep foundation pit support. Background Technology

[0002] Anchor cable support for foundation pits is a reinforcement and support method used in the construction of deep foundation pits. Anchor cable support involves inserting cable members into pre-drilled holes in the foundation pit, with one end inserted into the hole connecting to the pit surface to create a suspension effect, a composite beam effect, and a reinforcement effect, thereby achieving the purpose of support. It has advantages such as low cost, good support effect, simple operation, flexible use, and minimal occupation of construction clearance.

[0003] After the drilling of the foundation pit is completed, the anchor cable structure, consisting of anchor bolts, steel strands, and casings, needs to be bundled together. Then, the anchor cable structure is inserted into the borehole, and the end of the anchor cable structure located outside the borehole is locked. Then, pressurized grouting is injected into the borehole through the casing to make the anchor cable structure and the borehole form a whole. However, this is only for anchor cable construction of a single foundation pit. In the construction process, sometimes there are two adjacent deep foundation pits during the construction of super high-rise buildings. In this case, the independent anchor cable construction of the two deep foundation pits may affect the anchor cable support system of the other, resulting in unstable and unsafe deep foundation pit slope support, and cross-collision with other anchor cables, causing construction delays. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a construction method for anchor cables applied to deep foundation pits and anchor cables for deep foundation pit support, thereby solving the problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: an anchor cable for use in deep foundation pits, comprising a free section and an anchoring section, wherein each end of the anchoring section is connected to a set of free sections, and both the free section and the anchoring section are disposed within a borehole. Supporting steel discs are provided on both the free section and the anchoring section, and support grooves are formed on the edge surface of the supporting steel discs. Steel strands are disposed within the support grooves, and one end of the steel strands facing away from the anchoring section is fixedly connected to an anchor. A steel plate strip and a steel washer are also provided on the end of the anchor facing away from the free section, and a fixing ring is also provided on the anchoring section.

[0008] As a further preferred embodiment, at least one set of supporting steel discs is provided at equal intervals on the free section, and at least one set of supporting steel discs is also provided at equal intervals on the anchoring section, wherein the spacing of the supporting steel discs on the anchoring section is twice the spacing of the supporting steel discs on the free section.

[0009] As a further preferred embodiment, a fixing ring is provided between any two sets of supporting steel discs on the anchoring section. The supporting steel disc on one side of the fixing ring is rotated 360° in the forward direction, and the supporting steel disc on the other side of the fixing ring is rotated 360° in the reverse direction. The fixing ring holds the steel strand inside.

[0010] As a further preferred embodiment, the fixing ring is specifically a steel bar ring with a diameter of 8mm, and both ends of the steel bar ring are welded.

[0011] As a further preferred embodiment, the support grooves are evenly distributed on the support steel plate, and the support grooves are tangent to the outer diameter of the support steel plate.

[0012] As a further preferred embodiment, the length and width of the steel strip are 3000mm each. 300mm, and the thickness of the steel strip is 30mm.

[0013] As a further preferred embodiment, a construction method for anchor cables used in deep foundation pit support includes the following steps:

[0014] S1: Determine that the two deep foundation pit support pile positioning points are on the same straight line to facilitate anchor cable construction;

[0015] S2: Drill holes at the positioning points of the two deep foundation pit support piles simultaneously to form anchor cable placement holes, so that the two deep foundation pits are connected to each other.

[0016] S3: Use anchors to lock both ends of the anchor cable, put the anchor cable into the anchor cable placement hole, and lock the anchor cable as you dig. No more than three anchor cables should be locked each time you dig. After the hole is opened, put the anchor cable into the hole, and suspend the steel plate strip on both sides at the same position using a boom truck. Then tension and lock the anchor cable until the design value is reached.

[0017] S4: After all the anchor cables are locked, use an anchor drilling machine to excavate holes in the soil above the adjacent side of the two deep foundation pits until the holes are connected to the anchor cable placement holes.

[0018] S5: After the hole is formed, grouting, wire mesh installation and spraying are carried out;

[0019] S6: Steel waist beams and anchorages are used to prestress and lock the anchor cables on both sides.

[0020] As a further preferred embodiment, the diameter of the anchor cable placement hole in S2 is larger than the diameter of the anchor cable.

[0021] As a further preferred embodiment, in S6, the steel waist beam and the anchor cable are connected by a steel plate strip, and the steel waist beam is hoisted by a crane and the angle is ensured by using wedges.

[0022] (III) Beneficial Effects

[0023] This invention provides an anchor cable for use in deep foundation pits, which has the following beneficial effects:

[0024] 1. This invention uses two adjacent deep foundation pits to construct anchor cables, which effectively avoids the impact on the anchor cable support system of the other side that may be caused by independent anchor cable construction in two deep foundation pits, thus preventing instability and insecurity of the deep foundation pit slope support and construction delays caused by cross-collision with other anchor cables. It improves the overall stability and safety of the adjacent slope support system of the deep foundation pit, and has high reliability and practicality.

[0025] 2. This invention, by setting a fixing ring and supporting steel discs on the anchoring section, with the fixing ring positioned between any two sets of supporting steel discs, allows the supporting steel discs on one side of the fixing ring to twist 360° in the forward direction and the supporting steel discs on the other side of the fixing ring to twist 360° in the reverse direction. This 360° twisting of the supporting steel discs creates a torsion node in the steel strand, and the fixing ring is positioned between the two torsion nodes formed by the steel strand. Furthermore, the fixing ring secures the steel strand after it has twisted. The length of the fixing ring is greater than the perimeter of the cross-section of the twisted steel strands. Consequently, when the ends of the anchor cable are subjected to tension, the steel strands between the two sets of supporting steel discs in the anchoring section will first undergo torsion recovery, converting the tension at both ends into torsional recovery force. Concrete is then poured into the anchor cable, and the torsional recovery force is provided by the friction between the steel strands and the concrete, as well as the clamping force of the fixing ring and the concrete on the steel strands, effectively improving the tensile strength of the anchor cable. Attached Figure Description

[0026] Figure 1 This is a front sectional view of an anchor cable applied to a deep foundation pit according to the present invention;

[0027] Figure 2 for Figure 1 AA sectional view of the structure;

[0028] Figure 3 for Figure 1 BB cross-sectional structural diagram.

[0029] In the diagram: 1 Free section, 2 Anchoring section, 3 Fixing ring, 4 Steel plate strip, 5 Anchor, 6 Steel gasket, 7 Supporting steel disc, 8 Steel strand, 9 Supporting groove. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0035] This invention provides an anchor cable for use in deep foundation pits, comprising a free section 1 and an anchoring section 2. The anchoring section 2 is characterized by having a set of free sections 1 connected to each end, and both free sections 1 and anchoring sections 2 are located within a borehole. Both free sections 1 and anchoring sections 2 are provided with supporting steel discs 7. Supporting grooves 9 are formed on the edge surface of the supporting steel discs 7, and steel strands 8 are arranged within the supporting grooves 9. One end of the steel strands 8 facing away from the anchoring section 2 is fixedly connected to an anchor 5. The anchor 5, facing away from the free section 1, is also provided with a steel plate strip 4 and a steel gasket 6. A fixing ring 3 is also provided on the anchoring section 2.

[0036] In this embodiment, at least one set of supporting steel plates 7 are equally spaced on the free section 1, and at least one set of supporting steel plates 7 are also equally spaced on the anchoring section 2. The spacing of the supporting steel plates 7 on the anchoring section 2 is twice the spacing of the supporting steel plates 7 on the free section 1. The supporting steel plates 7 are used uniformly on the free section 1 and the anchoring section 2 to achieve the uniformity of the original components, which facilitates the collection of materials and reduces procurement costs.

[0037] In this embodiment, a fixing ring 3 is provided between any two sets of supporting steel discs 7 on the anchoring section 2. The supporting steel disc 7 on one side of the fixing ring 3 is rotated 360° in the forward direction, and the supporting steel disc 7 on the other side of the fixing ring 3 is rotated 360° in the reverse direction. The fixing ring 3 clamps the steel strand 8 inside.

[0038] In the construction of anchoring section 2, the steel strands 8 are first framed using supporting steel discs 7. Then, the steel strands 8 are twisted 360° in the forward direction, causing a connection node to form on the supporting steel discs 7. A fixing ring 3 is used to completely secure the twisted node of the steel strands 8 on the side away from the supporting steel discs 7. The two ends of the fixing ring 3 are then welded together. The steel strands 8 on the side of the fixing ring 3 away from the supporting steel discs 7 are then secured again using another set of supporting steel discs 7. The second set of supporting steel discs 7 used to secure the steel strands 8 is then used. The anchor cable is twisted 360° in the opposite direction. This places the fixing ring 3 between the two torsion nodes formed by the steel strands 8 formed by the two sets of supporting steel discs 7 twisting 360° respectively. When the two ends of the anchor cable are subjected to tension, the steel strands 8 between the two sets of supporting steel discs 7 in the anchoring section 2 will first undergo torsional recovery, so that the tension at both ends is converted into torsional recovery force. The anchor cable will be poured with concrete. The torsional recovery force is provided by the friction between the steel strands 8 and the concrete and the clamping force of the fixing ring 3 and the concrete on the steel strands 8, which effectively improves the tensile strength of the anchor cable.

[0039] In this embodiment, as Figure 3 As shown, the fixing ring 3 is specifically a steel bar ring with a diameter of 8mm, and the two ends of the steel bar ring are welded. The fixing ring 3 can also be a steel bar on the construction site. The fixing ring 3 fixes the steel strand 8 after it is twisted. The length of the fixing ring 3 is greater than the perimeter of the cross section of the steel strand 8 after it is twisted together.

[0040] Specifically, the support grooves 9 are evenly distributed on the support steel plate 7, and the support grooves 9 are tangent to the outer diameter of the support steel plate 7.

[0041] Furthermore, the length and width of steel strip 4 are 3000mm respectively. 300mm, and the thickness of steel plate strip 4 is 30mm.

[0042] This embodiment also provides a construction method for anchor cables used in deep foundation pit support, including the following steps:

[0043] S1: Determine that the two deep foundation pit support pile positioning points are on the same straight line to facilitate anchor cable construction;

[0044] S2: Drill holes at the positioning points of the two deep foundation pit support piles simultaneously to form anchor cable placement holes, so that the two deep foundation pits are connected to each other.

[0045] S3: Use anchor 5 to lock both ends of the anchor cable, put the anchor cable into the anchor cable placement hole, and lock the anchor cable as it is dug. No more than three anchor cables should be locked each time the excavation is carried out. After the hole is opened, the anchor cable is put into the hole, and the steel plate strip 4 is suspended on both sides at the same position by the boom truck. Then the anchor cable is tensioned and locked until the design value is reached.

[0046] S4: After all the anchor cables are locked, use an anchor drilling machine to excavate holes in the soil above the adjacent side of the two deep foundation pits until the holes are connected to the anchor cable placement holes.

[0047] S5: After the hole is formed, grouting, wire mesh installation and spraying are carried out;

[0048] S6: Steel waist beams and anchorages are used to prestress and lock the anchor cables on both sides.

[0049] In this embodiment, the two deep foundation pits are supported by anchor cables. In the actual construction process, considering that the positioning points of the support piles of the two deep foundation pits may not be on the same straight line, it is necessary to communicate with the adjacent construction unit about the positioning points of the support piles before construction. If they are not on the same straight line, one party needs to communicate with the design institute to change the positioning points of the support piles to ensure that the positioning points of the support piles on both sides are on the same straight line.

[0050] In S2, the diameter of the anchor cable placement hole is larger than the diameter of the anchor cable, which facilitates smooth grouting.

[0051] In this embodiment, the steel waist beam and the anchor cable in S6 are connected by steel plate strips. The steel waist beam is hoisted by a crane and wedges are used to ensure the angle.

[0052] In summary, the present invention provides a construction method for anchor cables and deep foundation pit support anchor cables applied to deep foundation pits. By constructing anchor cables in two adjacent deep foundation pits, it effectively avoids the impact on the anchor cable support system of the other two deep foundation pits that may be caused by independent anchor cable construction, which could lead to instability and insecurity of the deep foundation pit slope support, as well as construction delays due to cross-collision with other anchor cables. This improves the overall stability and safety of the adjacent slope support system of the deep foundation pit, and has high reliability and practicality.

[0053] Secondly, by setting a fixing ring 3 and a supporting steel plate 7 on the anchoring section 2, the fixing ring 3 is positioned between any two sets of supporting steel plates 7. The supporting steel plate 7 on one side of the fixing ring 3 is twisted 360° in the forward direction, and the supporting steel plate 7 on the other side of the fixing ring 3 is twisted 360° in the reverse direction. The 360° twist of the supporting steel plate 7 will cause the steel strand 8 to form a torsion node, and the fixing ring 3 is positioned between the two torsion nodes formed by the steel strand 8. The fixing ring 3 fixes the steel strand 8 after it has twisted. The length of the fixing ring 3 is greater than the perimeter of the cross section of the steel strand 8 after it has twisted together. Therefore, when the two ends of the anchor cable are subjected to tension, the steel strand 8 between the two sets of supporting steel plates 7 in the anchoring section 2 will first undergo torsion recovery, so that the tension at both ends is converted into torsion recovery force. The anchor cable will be poured with concrete, and the torsion recovery force is provided by the friction between the steel strand 8 and the concrete and the clamping force of the fixing ring 3 and the concrete on the steel strand 8, which effectively improves the tensile strength of the anchor cable.

[0054] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An anchor cable for use in deep foundation pits, comprising a free section (1) and an anchoring section (2), characterized in that: The anchoring section (2) is connected to a set of free sections (1) at both ends, and both the free sections (1) and the anchoring section (2) are set inside the borehole. Both the free sections (1) and the anchoring section (2) are provided with supporting steel discs (7). At least one set of supporting steel discs (7) is provided at equal intervals on the free section (1), and at least one set of supporting steel discs (7) is also provided at equal intervals on the anchoring section (2). The spacing of the supporting steel discs (7) on the anchoring section (2) is twice the spacing of the supporting steel discs (7) on the free section (1). The edge surface of the supporting steel discs (7) is provided with a supporting groove (9). A steel strand (8) is provided in the supporting groove (9). The end of the steel strand (8) away from the anchoring section (2) is fixedly connected to the anchor (5). The end of the anchor (5) away from the free section (1) is also provided with a steel plate strip (4) and a steel gasket (6). The anchoring section (2) is also provided with a fixing ring (3). A fixing ring (3) is provided between any two sets of supporting steel discs (7) on the anchoring section (2). The supporting steel disc (7) on one side of the fixing ring (3) is rotated 360° in the positive direction, and the supporting steel disc (7) on the other side of the fixing ring (3) is rotated 360° in the negative direction. The fixing ring (3) holds the steel strand (8) inside. The fixing ring (3) is specifically a steel bar ring with a diameter of 8mm, and the two ends of the steel bar ring are welded.

2. The anchor cable for deep foundation pits according to claim 1, characterized in that: The support grooves (9) are evenly arranged on the support steel plate (7), and the support grooves (9) are tangent to the outer diameter of the support steel plate (7).

3. The anchor cable for deep foundation pits according to claim 1, characterized in that: The length and width of the steel strip (4) are 3000mm and 3000mm respectively. 300mm, and the thickness of the steel strip (4) is 30mm.

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