Subway channel underground excavation deformation supporting structure

Abstract

The underground excavation deformation supporting structure comprises an anchor rod, a threaded column is installed at one end of the anchor rod, an anchor disc is arranged on the side, close to the threaded column, of the anchor rod, a round opening is formed in the middle of one face of the anchor disc, the threaded column penetrates through the round opening, and the inner diameter of the round opening is larger than the outer diameter of the threaded column. A nut is arranged on the side, away from the anchor rod, of the anchor disc, a supporting ring is arranged between the nut and the anchor disc, an outer ring concentric with the supporting ring is arranged on the outer side of the supporting ring, multiple rows of first screw holes distributed in a circle shape are formed in the inner side of one side face of the supporting ring, and inner screw rods used for supporting the nut are connected into the first screw holes in a threaded mode. A circle of second screw holes are formed in the outer side of one side face of the supporting ring, and outer screw rods used for limiting the position of the nut are connected into the second screw holes in a threaded mode The anchor plate has the advantages that the contact range between the anchor plate and the nut in the inclined state is enlarged, and tension borne by the anchor rod can be evenly transmitted.

Description

TECHNICAL FIELD

[0001] The utility model relates to a subway passage excavation deformation support structure and belongs to the technical field of support. BACKGROUND

[0002] The excavation method has the advantages of little interference to ground traffic and controllable influence on the surrounding environment, and becomes a commonly used method for subway passage construction. However, the excavation construction inevitably disturbs the surrounding soil and breaks the original stress balance, causing deformation of the subway passage. If the deformation cannot be effectively controlled, it will not only endanger the construction safety and lead to serious accidents such as tunnel collapse and ground subsidence, but also affect the long-term operation stability of the subway after completion, causing problems such as track deformation and structure leakage. Therefore, it is of great significance to study the deformation mechanism of the subway passage excavation and adopt scientific and reasonable support technology to ensure the quality and safety of the subway engineering. Anchor rod support is one of the commonly used support methods. After the anchor rod is anchored in the tunnel wall, a nut is screwed on the end of the anchor rod, and an anchor plate is arranged between the nut and the tunnel wall, so that the anchor rod, the nut and the anchor plate jointly form a structure for supporting the tunnel wall. Since the tunnel wall is not flat, when the nut extrudes the anchor plate to make the anchor plate fit the tunnel wall, only a part of the nut will be in contact with the anchor plate. If the nut is partially in contact, the tension force borne by the anchor rod cannot be uniformly transmitted, and the partial contact between the nut and the anchor plate will cause uneven force on the anchor rod, resulting in bending deformation of the anchor rod under the action of eccentric force and affecting the bearing capacity of the anchor rod. CONTENT OF THE UTILITY MODEL

[0003] In view of the deficiencies in the prior art, the utility model aims to provide a subway passage excavation deformation support structure to solve the problems in the background art. The utility model increases the contact range between the anchor plate and the nut in the inclined state, so that the tension force borne by the anchor rod can be uniformly transmitted.

[0004] In order to achieve the above-mentioned purpose, the utility model is implemented by the following technical scheme: a subway passage excavation deformation support structure, comprising an anchor rod, one end of the anchor rod is provided with a threaded column, one side of the anchor rod close to the threaded column is provided with an anchor plate, a circular opening is formed in the middle position of one side of the anchor plate, the threaded column penetrates through the circular opening, the inner diameter of the circular opening is larger than the outer diameter of the threaded column, a nut is arranged on the side of the anchor plate away from the anchor rod, the nut is threadedly connected with the threaded column, a lug ring is arranged between the nut and the anchor plate, an outer ring concentrically arranged with the lug ring is arranged on the outer side of the lug ring, the outer ring is connected and fixed with the anchor plate, two support plates are arranged on the side of the lug ring facing the anchor plate, the end of the support plate away from the lug ring is in contact with the anchor plate, a plurality of rows of first screw holes arranged in a ring shape are formed in the inner side of one side of the lug ring, an inner screw rod for supporting the nut is threadedly connected in the first screw hole, a ring of second screw holes is formed on the outer side of one side of the lug ring, and an outer screw rod for limiting the position of the nut is threadedly connected in the second screw hole.

[0005] Further, the outer ring is arranged concentrically with an inner ring, one end of which is fixedly connected with the anchor disc, the threaded column penetrates the inner ring, and the supporting ring is arranged between the inner ring and the outer ring.

[0006] Further, the nut is fixedly connected with a ring edge on one side facing the supporting ring, the ring edge is integrally formed with the nut, and the ring edge is in contact with the inner screw rod.

[0007] Further, a first inner hexagonal hole for inserting an inner hexagonal wrench is formed in the middle of one side of the inner screw rod facing the anchor disc, a second inner hexagonal hole for inserting an inner hexagonal wrench is formed in the middle of one side of the outer screw rod facing the anchor disc, and the inner screw rod and the outer screw rod are of the same specification.

[0008] Further, a plurality of rib plates are fixedly arranged on the outer surface of the outer ring in a ring shape at equal intervals, and the rib plates are fixedly connected with the anchor disc.

[0009] Further, two rib strips are integrally formed on the outer surface of the anchor rod, and a plurality of arc-shaped protrusions are arranged uniformly between the two rib strips, and the arc-shaped protrusions are integrally formed with the anchor rod.

[0010] Further, the supporting plate is in an arc-shaped structure and is attached to the inner wall of the outer ring.

[0011] The beneficial effects of the utility model are as follows:

[0012] 1. The supporting ring can be adjusted by the combination of the inner screw rod and the outer screw rod, so as to adapt to the inclination angle of the anchor disc; when the anchor disc is inclined due to uneven tunnel wall, the inner side of the nut is lifted by rotating the inner screw rod, the outer screw rod limits the displacement of the outer side of the nut, the nut is changed from local contact to annular surface contact, the contact area is expanded, and the pulling force borne by the anchor rod can be uniformly transmitted.

[0013] 2. The outer ring and the inner ring form a double-ring hoop structure, the rib plates are fixedly welded with the anchor disc, the overall rigidity is improved, the load transmitted by the nut can be uniformly dispersed to the whole surface of the anchor disc, and stress concentration of the traditional single-ring structure is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0014] Other features, objects and advantages of the utility model will become more apparent through reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0015] Figure 1 It is a structural schematic view of the utility model of a subway passage subsurface excavation deformation support structure;

[0016] Figure 2 It is an assembly schematic view of a threaded column, an anchor disc and an anchor rod in the utility model of a subway passage subsurface excavation deformation support structure;

[0017] Figure 3 It is assembly schematic view of inner screw rod, outer screw rod, support plate and support ring in subway passage subsurface excavation deformation support structure of the utility model;

[0018] Figure 4 It is assembly schematic view of inner ring, outer ring and anchor disc in subway passage subsurface excavation deformation support structure of the utility model;

[0019] In the drawing: 1-anchor rod, 2-anchor disc, 3-rib plate, 4-outer ring, 5-support ring, 6-threaded column, 7-nut, 8-ring edge, 9-round port, 10-rib strip, 11-arc convex, 12-first screw hole, 13-inner screw rod, 14-first inner hexagonal hole, 15-outer screw rod, 16-second inner hexagonal hole, 17-second screw hole, 18-support plate, 19-inner ring. DETAILED DESCRIPTION

[0020] In order to make the technical means, creation features, purposes and effects realized by the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0021] Please refer to Figures 1-4 The utility model provides a technical scheme: a subway passage subsurface excavation deformation support structure, including anchor rod 1, anchor rod 1 one end is equipped with threaded column 6, anchor rod 1 is close to threaded column 6 one side is equipped with anchor disc 2, anchor disc 2 one side middle position is equipped with round port 9, threaded column 6 passes through round port 9, the inner diameter of round port 9 is greater than the outer diameter of threaded column 6, anchor disc 2 is equipped with nut 7 on the side away from anchor rod 1, nut 7 is connected with threaded column 6 by screw thread, after anchor rod 1 is anchored in tunnel wall, the end portion will be screwed on nut 7, at this time anchor disc 2 is between nut 7 and tunnel wall, so that anchor rod 1, nut 7 and anchor disc 2 form the structure for supporting tunnel wall together.Anchor rod 1 outer surface is integrally formed with two rib strips 10, a plurality of evenly arranged arc convexes 11 are arranged between the two rib strips 10, arc convex 11 is integrally formed structure with anchor rod 1, and rib strip 10 and arc convex 11 improve the structural strength of anchor rod 1 together.

[0022] Please refer to Figures 1-4, the nut 7 and the anchor plate 2 are provided with a gudgeon 5, the outer side of the gudgeon 5 is provided with an outer ring 4 arranged concentrically with the gudgeon 5, the outer ring 4 is connected and fixed with the anchor plate 2, the side of the gudgeon 5 facing the anchor plate 2 is provided with two supporting plates 18, the end of the supporting plate 18 away from the gudgeon 5 is in contact with the anchor plate 2, the supporting plate 18 is of arc structure, the supporting plate 18 is in close contact with the inner wall of the outer ring 4, a plurality of rows of first screw holes 12 arranged in a ring shape are formed in the inner side of one side of the gudgeon 5, the first screw holes 12 are threadedly connected with inner screws 13 for supporting the nut 7, a ring of second screw holes 17 is formed in the outer side of one side of the gudgeon 5, the second screw holes 17 are threadedly connected with outer screws 15 for limiting the position of the nut 7, a first inner hexagonal hole 14 for inserting an inner hexagonal wrench is formed in the middle position of the side of the inner screw 13 facing the anchor plate 2, a second inner hexagonal hole 16 for inserting an inner hexagonal wrench is formed in the middle position of the side of the outer screw 15 facing the anchor plate 2, the inner screw 13 and the outer screw 15 are of the same specification, a rim 8 is connected and fixed to the side of the nut 7 facing the gudgeon 5, the rim 8 is of an integral molding structure with the nut 7, the rim 8 is in contact with the inner screw 13, the gudgeon 5 can be adjusted through the combination of the inner screw 13 and the outer screw 15, so as to adapt to the inclination angle of the anchor plate 2, when the anchor plate 2 is inclined due to the unevenness of the tunnel wall, the inner side of the nut 7 is lifted by screwing the inner screw 13, the outer screw 15 limits the displacement of the outer side of the nut 7, so that the nut 7 changes from partial contact to annular surface contact, the contact area is expanded, so that the pulling force borne by the anchor rod 1 can be uniformly transmitted.

[0023] Referring to Figure 1 and Figure 4 , the inner side of the outer ring 4 is provided with an inner ring 19 arranged concentrically with the outer ring 4, one end of the inner ring 19 is connected and fixed with the anchor plate 2, the threaded column 6 penetrates the inner ring 19, the gudgeon 5 is arranged between the inner ring 19 and the outer ring 4, a plurality of rib plates 3 are fixed at equal intervals on the outer surface of the outer ring 4 in a ring shape, the rib plates 3 are connected and fixed with the anchor plate 2, the outer ring 4 and the inner ring 19 form a double-ring hoop structure, which is welded and fixed with the anchor plate 2 through the rib plates 3, the overall rigidity is improved, and the structure can uniformly disperse the load transmitted by the nut 7 to the full surface of the anchor plate 2, avoiding stress concentration of the traditional single-ring structure.

[0024] Although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A support structure for deformation during underground excavation of a subway tunnel, comprising anchor bolts (1), characterized in that: One end of the anchor rod (1) is fitted with a threaded post (6). An anchor plate (2) is located on the side of the anchor rod (1) near the threaded post (6). A circular opening (9) is located in the middle of one side of the anchor plate (2). The threaded post (6) passes through the circular opening (9). The inner diameter of the circular opening (9) is larger than the outer diameter of the threaded post (6). A nut (7) is located on the side of the anchor plate (2) away from the anchor rod (1). The nut (7) is threadedly connected to the threaded post (6). A retainer ring (5) is located between the nut (7) and the anchor plate (2). An outer ring (4) is arranged concentrically with the retainer ring (5) on the outer side of the retainer ring (5). The outer ring (4) is connected and fixed to the anchor plate (2). Two support plates (18) are installed on the side of the support ring (5) facing the anchor plate (2). The end of the support plate (18) away from the support ring (5) is in contact with the anchor plate (2). Multiple rows of first screw holes (12) are opened on the inner side of one side of the support ring (5). The first screw hole (12) is internally threaded with an inner screw rod (13) for supporting the nut (7). A second screw hole (17) is opened on the outer side of one side of the support ring (5). The second screw hole (17) is internally threaded with an outer screw rod (15) for limiting the position of the nut (7).

2. The deformation support structure for subway tunnel excavation according to claim 1, characterized in that: The outer ring (4) has an inner ring (19) arranged concentrically with the outer ring (4) on its inner side. One end of the inner ring (19) is connected and fixed to the anchor plate (2). The threaded column (6) passes through the inner ring (19). The support ring (5) is set between the inner ring (19) and the outer ring (4).

3. The deformation support structure for subway tunnel excavation according to claim 1, characterized in that: The nut (7) has a ring edge (8) fixed to the side facing the ring (5). The ring edge (8) and the nut (7) are integrally formed. The ring edge (8) is in contact with the inner screw (13).

4. The support structure for deformation during underground excavation of a subway tunnel according to claim 1, characterized in that: The inner screw (13) has a first hexagonal hole (14) for inserting an internal hexagonal wrench at the center of the side facing the anchor plate (2), and the outer screw (15) has a second hexagonal hole (16) for inserting an internal hexagonal wrench at the center of the side facing the anchor plate (2). The inner screw (13) and the outer screw (15) have the same specifications.

5. The support structure for deformation during underground excavation of a subway tunnel according to claim 1, characterized in that: The outer ring (4) has multiple stiffening plates (3) fixed at equal intervals on its outer surface in a ring shape, and the stiffening plates (3) are connected and fixed to the anchor plate (2).

6. The deformation support structure for subway tunnel excavation according to claim 1, characterized in that: The anchor rod (1) has two ribs (10) integrally formed on its outer surface, and a plurality of evenly arranged arc-shaped protrusions (11) are provided between the two ribs (10). The arc-shaped protrusions (11) and the anchor rod (1) are integrally formed.

7. The support structure for deformation during underground excavation of a subway tunnel according to claim 1, characterized in that: The support plate (18) has an arc-shaped structure and is attached to the inner wall of the outer ring (4).

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