Existing anchor cable locking device

Abstract

The utility model relates to an existing anchor cable locking device. When a tunnel to be built is constructed close to an existing foundation pit, mutual construction interference is caused due to the fact that the relative distance is small, and the problems of long construction period, high engineering cost, large construction risk and the like are caused by the fact that the construction period of the adjacent tunnel is usually staggered in the traditional construction process. The anchor cable fastening device comprises a first anchor cable bearing plate, a second anchor cable bearing plate and an anchor cable fastening nut, and the first anchor cable bearing plate penetrates through an exposed existing foundation pit anchor cable steel strand to be arranged on the side, opposite to the existing foundation pit anchor cable, of a primary support grating steel frame. The second anchor cable bearing plate penetrates through the exposed existing foundation pit anchor cable steel strand to be arranged on the first anchor cable bearing plate, and the anchor cable fastening nut penetrates through the exposed existing foundation pit anchor cable steel strand to be arranged on the second anchor cable bearing plate. According to the utility model, the proposed tunnel construction can be carried out in the same period under the working condition of the existing foundation pit.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit engineering, in particular to an existing anchor cable locking device. Background Art

[0002] At present, the development of rail transit has made great progress and has become an indispensable part of the urban transportation system. Due to its rapid development, it also faces many challenges. When the proposed tunnel is close to the existing foundation pit, the relative distance is small, which leads to interference between the construction, which has always been a major problem plaguing subway construction. Traditional construction technology usually staggers the construction period of adjacent tunnels, but it will cause problems such as long construction period, high project cost, and high construction risk.

[0003] Therefore, there is an urgent need for a device that can carry out tunnel construction simultaneously while ensuring the safety of the existing foundation pit. Summary of the invention

[0004] The utility model aims to provide an existing anchor cable locking device, so as to at least solve the problem that the prior art cannot carry out tunnel construction simultaneously under the premise of ensuring the safety of the existing foundation pit.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] An existing anchor cable locking device, the device comprising a first anchor cable bearing plate, a second anchor cable bearing plate and an anchor cable fastening nut, the existing foundation pit anchor cable is cut and located on one side of the primary support grid steel frame, and the existing foundation pit anchor cable steel strand in the existing foundation pit anchor cable is tensioned through the primary support grid steel frame and exposed on the other side of the primary support grid steel frame;

[0007] The first anchor cable pressure plate passes through the exposed existing foundation pit anchor cable steel strand and is arranged on the side of the primary support grid steel frame opposite to the existing foundation pit anchor cable; the second anchor cable pressure plate passes through the exposed existing foundation pit anchor cable steel strand and is arranged on the first anchor cable pressure plate; the anchor cable fastening nut passes through the exposed existing foundation pit anchor cable steel strand and is arranged on the second anchor cable pressure plate, thereby locking the existing foundation pit anchor cable.

[0008] Furthermore, the cut surface of the existing foundation pit anchor cable is fitted with one side of the primary support grid steel frame.

[0009] Furthermore, the first anchor cable pressure plate is a rectangular parallelepiped and has a hole 1 in the middle.

[0010] Furthermore, the first anchor cable pressure plate is 180-220 mm long, 160-200 mm wide and 18-22 mm thick.

[0011] Furthermore, the diameter of the hole is 30-40 mm.

[0012] Furthermore, the second anchor cable pressure plate is a rectangular parallelepiped and has a second hole in the middle.

[0013] Furthermore, the second anchor cable pressure plate is 230-270 mm long, 160-200 mm wide and 18-22 mm thick.

[0014] Furthermore, the diameter of the second hole is 45-55 mm.

[0015] Furthermore, the primary grid steel frame is provided with hollow grouting anchor rods.

[0016] Furthermore, the diameter of the hollow grouting anchor is 20-30 mm.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] The utility model arranges a first anchor cable pressure plate, a second anchor cable pressure plate and an anchor cable fastening nut in sequence on one side of the primary support grid steel frame where the existing foundation pit anchor cable steel strand is exposed, so as to lock the existing foundation pit anchor cable, thereby avoiding affecting the safety of the existing foundation pit, and enabling the proposed tunnel construction or foundation pit construction to be carried out simultaneously with the existing foundation pit, thus solving the problem of construction interference caused by the proposed tunnel being close to the existing foundation pit, and not only overcoming the technical difficulty of safety protection of the existing foundation pit by the proposed tunnel being built in a short distance, but also utilizing the tensioning effect of the existing foundation pit anchor cable to optimize the proposed support measures, thereby greatly reducing the construction cost while ensuring safety, having high economic and social benefits, and having broad application prospects in urban rail transit, railways and building construction projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a cross-sectional view of the positional relationship between the proposed tunnel and the existing foundation pit installed with the present embodiment;

[0021] Figure 2 yes Figure 1 The enlarged structural diagram of this embodiment;

[0022] Figure 3 is a schematic diagram of the structure of the first anchor cable bearing plate;

[0023] Figure 4 is a schematic diagram of the structure of the second anchor cable bearing plate;

[0024] The symbols in the figure are:

[0025] 1-existing foundation pit anchor cable, 2-primary support grid steel frame, 3-first anchor cable pressure plate, 4-second anchor cable pressure plate, 5-anchor cable fastening nut, 6-hollow grouting anchor rod, 7-existing foundation pit anchor cable steel strand. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0027] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Meanwhile, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. Of course, such objects can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0030] Example:

[0031] like Figure 1-Figure 4 As shown, this embodiment provides an existing anchor cable locking device, including a first anchor cable pressure bearing plate 3, a second anchor cable pressure bearing plate 4 and an anchor cable fastening nut 5.

[0032] The construction unit locates the position of the existing foundation pit anchor cable 1 in advance during construction. When constructing the planned tunnel, the relative relationship between the initial support grid steel frame 2 and the existing foundation pit anchor cable 1 is adjusted according to its own construction process to avoid arranging the existing foundation pit anchor cable 1 and the initial support grid steel frame 2 in the same row to prevent the initial support grid steel frame 2 from interfering with the installation space of the existing foundation pit anchor cable 1 tray.

[0033] After the tunnel rock excavation is completed, the surface scum is removed, and the existing foundation pit anchor cable 1 intruding into the primary support grid steel frame 2 is cut. After the existing foundation pit anchor cable 1 is cut, it is located on one side of the primary support grid steel frame 2, and the cut surface of the existing foundation pit anchor cable 1 is in contact with one side of the primary support grid steel frame 2. The steel mesh is hung in time and 50mm thick wet sprayed concrete is sprayed. The existing foundation pit anchor cable 1 tray is close to the sprayed concrete base surface, the primary support grid steel frame 2 is erected and the concrete is sprayed again to the designed thickness. The existing foundation pit anchor cable steel strand 7 in the existing foundation pit anchor cable 1 is tensioned through the primary support grid steel frame 2 and exposed on the other side of the primary support grid steel frame 2 to ensure that the existing foundation pit anchor cable 1 is not unloaded, and the present embodiment is installed at one end of the existing foundation pit anchor cable steel strand 7 exposed on the primary support grid steel frame 2.

[0034] The first anchor cable pressure plate 3 passes through the exposed existing foundation pit anchor cable steel strand 7 and is arranged on the primary support grid steel frame 2 on the opposite side of the existing foundation pit anchor cable 1. The second anchor cable pressure plate 4 passes through the exposed existing foundation pit anchor cable steel strand 7 and is arranged on the first anchor cable pressure plate 3. The anchor cable fastening nut 5 passes through the exposed existing foundation pit anchor cable steel strand 7 and is arranged on the second anchor cable pressure plate 4. The existing foundation pit anchor cable 1 is locked by sequentially installing the first anchor cable pressure plate 3, the second anchor cable pressure plate 4 and the anchor cable fastening nut 5 on the exposed existing foundation pit anchor cable steel strand 7 to form a pulling measure between the proposed tunnel and the existing foundation pit.

[0035] The hollow grouting anchor rod 6 has a diameter of 25 mm and a length of 3 m. The longitudinal spacing of the ring is 1 mx1.5 m. It is arranged in a plum blossom shape on the primary support grid steel frame 2. The arch wall system is constructed. The hollow grouting anchor rod 6 can be optimized within the scope of the pulling measures to realize the simultaneous implementation of the proposed cableway near the existing foundation pit and save the construction cost of the proposed tunnel while ensuring the safety of the existing foundation pit.

[0036] In this embodiment, the first anchor cable pressure plate 3 is a rectangular parallelepiped with a hole 1 in the middle. The first anchor cable pressure plate 3 is 200 mm long, 180 mm wide and 20 mm thick.

[0037] The diameter of hole 1 is 35mm.

[0038] The second anchor cable pressure plate 4 is a rectangular parallelepiped with a second hole in the middle. The second anchor cable pressure plate 4 is 250 mm long, 180 mm wide and 20 mm thick.

[0039] The diameter of hole 2 is 50mm.

[0040] The first anchor cable pressure bearing plate 3 and the second anchor cable pressure bearing plate 4 are both made of Q235 steel.

[0041] When cutting the existing foundation pit anchor cables 1, the number of existing foundation pit anchor cables 1 cut off in a single construction should be reduced, and it is strictly forbidden to expand the excavation cycle footage in the affected area; during the construction, the on-site monitoring and measurement work and geological advance forecasting work should be strengthened, and information should be fed back in time to adjust the relevant design parameters.

[0042] The use process of this embodiment is as follows:

[0043] When constructing the proposed tunnel, horizontal excavation is performed in advance to locate the existing foundation pit anchor cable 1 and find out its position. Then, the initial support grid steel frame 2 of the proposed tunnel is constructed, and the intruding existing foundation pit anchor cable 1 is cut synchronously. Then, the existing foundation pit anchor cable steel strand 7 in the existing foundation pit anchor cable 1 is passed through the initial support grid steel frame 2 for tensioning to ensure that the existing foundation pit anchor cable 1 is not unloaded. Then, the first anchor cable pressure plate 3, the second anchor cable pressure plate 4 and the anchor cable fastening nut 5 are installed in sequence on the side of the initial support grid steel frame 2 where the existing foundation pit anchor cable steel strand 7 is exposed, and the existing foundation pit anchor cable 1 is locked to form a pulling measure between the proposed tunnel and the existing foundation pit.

[0044] The above specific examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. For those skilled in the art of the present invention, some simple deductions, deformations or substitutions can be made based on the idea of ​​the present invention.

Claims

1. An existing anchor cable locking device, characterized in that: The device comprises a first anchor cable pressure plate (3), a second anchor cable pressure plate (4) and an anchor cable fastening nut (5); the existing foundation pit anchor cable (1) is cut and located on one side of the primary support grid steel frame (2); the existing foundation pit anchor cable steel strand (7) in the existing foundation pit anchor cable (1) is tensioned and passed through the primary support grid steel frame (2) to be exposed on the other side of the primary support grid steel frame (2); The first anchor cable pressure plate (3) passes through the exposed existing foundation pit anchor cable steel strand (7) and is arranged on the side of the primary support grid steel frame (2) opposite to the existing foundation pit anchor cable (1); the second anchor cable pressure plate (4) passes through the exposed existing foundation pit anchor cable steel strand (7) and is arranged on the first anchor cable pressure plate (3); the anchor cable fastening nut (5) passes through the exposed existing foundation pit anchor cable steel strand (7) and is arranged on the second anchor cable pressure plate (4), thereby locking the existing foundation pit anchor cable (1).

2. An existing anchor cable locking device according to claim 1, characterized in that: The cut surface of the existing foundation pit anchor cable (1) is in contact with one side of the primary support grid steel frame (2).

3. The existing anchor cable locking device according to claim 1, characterized in that: The first anchor cable pressure plate (3) is a rectangular parallelepiped and is provided with a first hole in the middle.

4. The existing anchor cable locking device according to claim 1, characterized in that: The first anchor cable pressure plate (3) is 180-220 mm long, 160-200 mm wide and 18-22 mm thick.

5. The existing anchor cable locking device according to claim 3, characterized in that: The diameter of the hole is 30-40 mm.

6. The existing anchor cable locking device according to claim 1, characterized in that: The second anchor cable pressure plate (4) is a rectangular parallelepiped and is provided with a second hole in the middle.

7. An existing anchor cable locking device according to claim 1, characterized in that: The second anchor cable pressure plate (4) is 230-270 mm long, 160-200 mm wide and 18-22 mm thick.

8. An existing anchor cable locking device according to claim 6, characterized in that: The diameter of the second hole is 45-55 mm.

9. The existing anchor cable locking device according to claim 1, characterized in that: The primary grid steel frame (2) is provided with a hollow grouting anchor rod (6).

10. An existing anchor cable locking device according to claim 9, characterized in that: The diameter of the hollow grouting anchor rod (6) is 20-30 mm.

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