Grouting pipe structure and grouting system suitable for hydraulic tunnel fault zone

Abstract

The utility model discloses a grouting pipe structure and a grouting system suitable for a hydraulic tunnel fault zone, the grouting pipe structure comprises a first grouting pipe and a second grouting pipe, and the first grouting pipe is provided with a grouting hole; one end of the first grouting pipe is fixed in the fault zone, and the other end of the first grouting pipe penetrates through the supporting layer and extends towards the outer side of the supporting layer; one end of the second grouting pipe communicates with the first grouting pipe, the other end of the second grouting pipe penetrates through the lining layer, and an opening in the outer end of the second grouting pipe is located in the tunnel. The utility model solves the technical problem that the pre-buried grouting pipe and the hydraulic tunnel construction passage interfere with each other.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydropower engineering, and particularly relates to a grouting pipe structure and a grouting system applicable to a fault zone of a hydraulic tunnel. Background Technique

[0002] In the practice of water conservancy and hydropower projects, it often occurs that a hydraulic tunnel passes through an area affected by adverse geological structures such as a fault zone and an altered zone. For a hydraulic tunnel, especially a high-pressure tunnel, it is usually necessary to carry out enhanced consolidation grouting treatment on parts such as the fault zone and the concentrated water outlet point to enhance the surrounding rock resistance and impermeability. Specifically, enhanced consolidation grouting holes are arranged along the direction of the fault zone, obliquely through the fault zone, and at the concentrated water outlet point, and grouting pipes are set, and cement grouting or chemical grouting is used for strengthening. During the on-site excavation construction process, after the fault zone is discovered, a support layer is usually set at the fault part to seal the fault zone and pre-buried grouting pipes. After the lining layer outside the support layer is constructed, the fault zone is grouted. Since the pre-buried grouting pipes have a certain length, they often interfere with the construction passage of the hydraulic tunnel. Content of the Utility Model

[0003] Aiming at the existing technical problems, the utility model aims to provide a grouting pipe structure and a grouting system applicable to a fault zone of a hydraulic tunnel, and the grouting pipe structure can solve the technical problem that the pre-buried grouting pipe interferes with the construction passage of the hydraulic tunnel.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A grouting pipe structure applicable to a fault zone of a hydraulic tunnel, and its structural feature is: it includes a first grouting pipe and a second grouting pipe, and the first grouting pipe is provided with grouting holes; one end of the first grouting pipe is fixed in the fault zone, and the other end penetrates through the support layer and extends to the outside of the support layer; one end of the second grouting pipe is communicated with the first grouting pipe, and the other end penetrates through the lining layer, and the outer end opening of the second grouting pipe is located in the tunnel.

[0006] During the construction of the fault zone support, the first grouting pipe is pre-buried, and the outer end of the first grouting pipe exposes the surface of the support layer and does not affect the on-site construction passage. When the steel bar binding construction of the lining layer is carried out, the second grouting pipe is connected to the outer end of the first grouting pipe, and the consolidation grouting construction is carried out after the lining layer is constructed. The grouting pipe structure applicable to the fault zone of the hydraulic tunnel of the utility model adopts a combined two-stage pre-buried grouting pipe method, so that the grouting pipe does not interfere with the construction passage of the hydraulic tunnel.

[0007] Specifically, the first grouting pipe and the second grouting pipe are connected by a first connecting piece. One end of the first connecting piece is fixedly connected to the first grouting pipe. The end of the second grouting pipe is arranged inside the first grouting pipe and is fixedly connected to the first connecting piece. The first grouting pipe can be a galvanized steel flower pipe, and the first connecting piece can be a steel bar, and the steel bar is welded to the galvanized steel flower pipe.

[0008] Preferably, the second grouting pipe is a PVC pipe, and the PVC pipe and the first connecting piece are tied and fixed by a second connecting piece. Using a PVC pipe as the second grouting pipe can greatly save construction costs. The second connecting piece can be a wire or a steel wire, and the PVC pipe is tied and fixed to the steel bar with a wire or a steel wire. When the PVC pipe is extended, it can be adjusted according to the steel bar tying situation to avoid damaging the structural steel bars during the drilling of the consolidated grouting holes.

[0009] Preferably, the length of the second grouting pipe arranged inside the first grouting pipe is greater than or equal to 2 cm, and the length of the second grouting pipe arranged inside the tunnel is less than or equal to 3 cm. After the consolidated grouting construction is completed, the PVC pipe exposed outside the tunnel needs to be removed.

[0010] Preferably, the center lines of the first grouting pipe and the second grouting pipe along the length direction are collinear, and both are inclined.

[0011] Preferably, the length of the first grouting pipe located in the fault zone is greater than or equal to 1 m, and the length of the first grouting pipe extending outward from the fault zone is 0.3 - 0.5 m. The thickness of the support layer outside the fault zone is usually about 250 mm. The length of the first grouting pipe extending outward from the fault zone is 0.3 - 0.5 m, so that the exposed length of the first grouting pipe exposes the surface of the support layer and does not affect the on-site construction traffic.

[0012] Preferably, a detachable cover is provided at the outer end of the second grouting pipe. The cover can be a wooden plug. Setting the cover can temporarily block the end orifice of the second grouting pipe to prevent the grouting pipe from being blocked.

[0013] Specifically, a plurality of grouting holes are arranged along the circumferential direction of the first grouting pipe, and the adjacent grouting holes are staggered along the length direction of the first grouting pipe.

[0014] Based on the same inventive concept, the present application also provides a grouting system applicable to the fault zone of a hydraulic tunnel. A plurality of grouting pipe structures applicable to the fault zone of a hydraulic tunnel as described above are provided on the side wall of the tunnel.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] 1. The grouting pipe structure applicable to the fault zone of a hydraulic tunnel of the present utility model adopts a combined two-stage embedded grouting pipe method, so that the grouting pipe does not interfere with the construction traffic of the hydraulic tunnel.

[0017] 2. The grouting pipe structure applicable to the fault zone of a hydraulic tunnel of the present utility model ensures the accuracy of the hole positions and directions of the consolidation grouting of the lining layer by means of connecting PVC pipes during the stage of binding the concrete steel bars of the lining layer. When connecting the PVC pipes, it can be adjusted according to the binding situation of the steel bars, avoiding the damage to the structural steel bars during the hole drilling process of the consolidation grouting holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the grouting pipe structure applicable to the fault zone of a hydraulic tunnel of this embodiment;

[0019] Figure 2 is Figure 1 a schematic diagram of the first grouting pipe structure during the middle excavation and support stage;

[0020] Figure 3 is Figure 1 a schematic diagram of the connection structure between the first grouting pipe and the first connector in ;

[0021] Figure 4 It is a schematic diagram of the grouting system structure applicable to the fault zone of a hydraulic tunnel of this embodiment.

[0022] In the figure:

[0023] 1 - first grouting pipe, 101 - grouting hole, 2 - second grouting pipe, 3 - fault zone, 4 - support layer, 5 - lining layer, 6 - tunnel, 7 - cover, 8 - first connector, 9 - second connector. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will detail the present utility model with reference to the drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. For the convenience of description, words such as "upper", "lower", "left", and "right" hereinafter only indicate the same directions as the upper, lower, left, and right directions of the drawings themselves, and do not limit the structure.

[0025] As Figure 1 shown, a grouting pipe structure applicable to the fault zone of a hydraulic tunnel provided in this embodiment includes a first grouting pipe 1 and a second grouting pipe 2. The second grouting pipe 2 is a DN75 PVC pipe. The first grouting pipe 1 is a DN80 galvanized steel perforated pipe with a length of 1.5 m. As Figure 3As shown in the figure, a plurality of grouting holes 101 are evenly arranged along the circumferential direction on the first grouting pipe 1, and the grouting holes 101 are arranged in a plum blossom pattern. Along the length direction of the first grouting pipe 1, the adjacent grouting holes 101 are staggered, and the distance between the adjacent grouting holes 101 is 200 mm. The first grouting pipe 1 and the second grouting pipe 2 are connected by a first connecting piece 8 and a second connecting piece 9. The first connecting piece 8 is a φ18 steel bar with a length of 1100 mm, and the second connecting piece 9 is a wire. As Figure 4 As shown, this embodiment also provides a grouting system applicable to the fault zone of a hydraulic tunnel. A plurality of grouting pipe structures applicable to the fault zone of a hydraulic tunnel as described above are provided on the side wall of the tunnel 6.

[0026] The specific construction steps of the grouting pipe structure applicable to the fault zone of a hydraulic tunnel in this embodiment include:

[0027] Step (1), during the support construction in the bad geological area, embed a galvanized steel perforated pipe; the length of the galvanized steel perforated pipe extending into the fault zone 3 is 1.0 m, and the exposed length is 0.5 m; the thickness of the support layer 4 is 250 mm. As Figure 2 As shown, the galvanized steel perforated pipe penetrates through the support layer 4 and extends outward from the support layer 4, and the extension length does not affect the on-site construction passage. The outer end of the galvanized steel perforated pipe is blocked with a temporary wooden plug; the galvanized steel perforated pipe is firmly connected and fixed to the steel bar mesh or steel arch frame to prevent it from falling.

[0028] Step (2), during the steel bar binding construction of the lining layer 5, weld a φ18 steel bar inside the exposed galvanized steel perforated pipe, and the welding position avoids the opening position of the grouting hole 101. The length of the steel bar extending into the galvanized steel perforated pipe is 250 mm; fix a PVC pipe on the steel bar with multiple wires. The length of the PVC pipe extending into the galvanized steel pipe is 2 cm, and the length set inside the tunnel 6 is 3 cm. The thickness of the lining layer 5 is 1200 mm; the PVC pipe and the galvanized steel perforated pipe are collinear in the center and are both inclined.

[0029] Step (3), during the lining concrete pouring process, temporarily block the orifice of the PVC pipe with a capping 7, and the capping 7 is a wooden plug; after the lining concrete pouring is completed, remove the wooden plug, drill a consolidation grouting hole along the direction of the embedded PVC pipe, and conduct consolidation grouting construction after the hole drilling is completed; remove the exposed residual PVC pipe after the grouting construction is completed.

[0030] The content clarified in the above embodiments should be understood that these embodiments are only used to illustrate the present invention more clearly, rather than to limit the scope of the present invention. After reading the present invention, various equivalent forms of modification of this embodiment by those skilled in the art all fall within the scope defined by the appended claims of the present invention.

Claims

1. A grouting pipe structure suitable for hydraulic tunnel fault zone, characterized in that: It comprises a first grouting pipe (1) and a second grouting pipe (2), wherein the first grouting pipe (1) is provided with a grouting hole (101); One end of the first grouting pipe (1) is fixed in the fault zone (3), and the other end penetrates the supporting layer (4) and extends toward the outside of the supporting layer (4); One end of the second grouting pipe (2) is connected to the first grouting pipe (1), and the other end passes through the lining layer (5), and the outer end opening of the second grouting pipe (2) is located in the tunnel (6).

2. The grouting pipe structure suitable for hydraulic tunnel fault zone according to claim 1 is characterized in that: The first grouting pipe (1) and the second grouting pipe (2) are connected via a first connecting piece (8), one end of the first connecting piece (8) being fixedly connected to the first grouting pipe (1); the end of the second grouting pipe (2) is arranged in the first grouting pipe (1) and is fixedly connected to the first connecting piece (8).

3. The grouting pipe structure suitable for hydraulic tunnel fault zone according to claim 2 is characterized in that: The second grouting pipe (2) is a PVC pipe, and the PVC pipe is tied and fixed to the first connecting piece (8) via a second connecting piece (9).

4. The grouting pipe structure suitable for hydraulic tunnel fault zone according to claim 3 is characterized in that: The length of the second grouting pipe (2) arranged in the first grouting pipe (1) is greater than or equal to 2 cm, and the length of the second grouting pipe (2) arranged in the tunnel (6) is less than or equal to 3 cm.

5. The grouting pipe structure suitable for hydraulic tunnel fault zone according to claim 1 is characterized in that: The center lines of the first grouting pipe (1) and the second grouting pipe (2) along the length direction are collinear and both are arranged obliquely.

6. The grouting pipe structure suitable for hydraulic tunnel fault zone according to claim 1 is characterized in that: The length of the first grouting pipe (1) located inside the fault zone (3) is greater than or equal to 1 m, and the length of the first grouting pipe (1) extending outside the fault zone (3) is 0.3 to 0.5 m.

7. The grouting pipe structure suitable for hydraulic tunnel fault zone according to claim 1 is characterized in that: The outer end of the second grouting pipe (2) is provided with a detachably connected sealing cover (7).

8. The grouting pipe structure suitable for hydraulic tunnel fault zone according to claim 1 is characterized in that: The first grouting pipe (1) is provided with a plurality of grouting holes (101) along the circumferential direction, and adjacent grouting holes (101) are arranged in a staggered manner along the length direction of the first grouting pipe (1).

9. A grouting system suitable for hydraulic tunnel fault zones, characterized in that: A plurality of grouting pipe structures suitable for hydraulic tunnel fault zones as claimed in any one of claims 1 to 8 are provided on the side walls of the tunnel (6).

Images