Grouting pipe and tunnel vault cavity backfill grouting structure

Abstract

The utility model relates to a grouting pipe and a tunnel vault cavity backfill grouting structure. The grouting pipe comprises a cavity formed between a tunnel vault waterproof layer and a second lining structure, a plurality of grouting holes formed in the second lining structure and communicated with the cavity, and grouting pipes arranged in the grouting holes. The grouting pipe comprises a pipe body with a grouting channel, a plurality of arc-shaped protrusions and a plurality of arc-shaped grooves are arranged on the top of the pipe body along the circumference, and the arc-shaped protrusions and the arc-shaped grooves are alternately arranged. The utility model solves a series of problems caused by the fact that the grouting pipe is easy to damage the waterproof layer and only the grouting pipe and the waterproof layer can be arranged in a gap for grouting in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel cavity repair, and specifically relates to a grouting pipe and a tunnel vault cavity backfill grouting structure. Background Art

[0002] Operating tunnels are usually equipped with waterproof layers made of waterproof sheets, asphalt waterproof membranes and other materials. However, during the construction and use of the tunnel, the secondary lining structure often sinks due to construction process problems, changes in geological conditions, material aging, improper maintenance and management, and environmental factors such as vehicle loads, thereby forming voids between the arch waterproof layer and the secondary lining structure layer. This requires repair construction of the voids, and the current construction of operating tunnels has the following problems: 1) The construction process is complex, usually based on experience, and the construction quality is unstable; 2) Only tunnel reinforcement can be carried out. When the waterproof layer is damaged, the waterproof layer cannot be repaired; 3) The grouting pipe used for repair grouting is usually pointed. Therefore, when grouting, the grouting pipe must be aligned with the waterproof layer or the initial layer. In order to solve a series of problems caused by the pointed head of the grouting pipe, the prior art also discloses a flat-head grouting pipe, which performs grouting by opening a cross-shaped groove on the top of the grouting pipe. However, the grouting pipe still has a large destructive force when it abuts against the waterproof layer. Therefore, it is only applicable to tunnel cavities with waterproof board waterproof layers. For tunnel cavities with weaker waterproof layers such as asphalt waterproof membranes, there is still a problem of easily damaging the waterproof layer and being unable to abut against the waterproof layer during grouting. In addition, the cross-shaped groove has a large resistance to the outflow of grouting slurry made of large particles such as cement, and is not conducive to the outflow of slurry when grouting is abutted against the waterproof layer. Utility Model Content

[0003] The utility model aims to overcome the defect that the grouting pipe in the prior art is easy to damage the waterproof layer, and provides a grouting pipe and a tunnel vault cavity backfill grouting structure.

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

[0005] A grouting pipe comprises a pipe body with a grouting channel, wherein a plurality of arc-shaped protrusions and a plurality of arc-shaped grooves are arranged on the top of the pipe body along the circumference, and the arc-shaped protrusions and the arc-shaped grooves are arranged alternately.

[0006] As a further technical solution, there are two arc-shaped protrusions and two arc-shaped grooves, and they are the same in shape and size.

[0007] As a further technical solution, the height of the arc-shaped protrusion or the depth of the arc-shaped groove is 8-10 mm.

[0008] As a further technical solution, a plurality of serrated rings are provided at the tail of the tube body.

[0009] As a further technical solution, a valve for opening or closing the grouting channel is also provided on the pipe body.

[0010] A tunnel vault cavity backfill grouting structure comprises a cavity arranged between a tunnel vault waterproof layer and a secondary lining structure, a plurality of grouting holes opened on the secondary lining structure and connected to the cavity, and a grouting pipe arranged in the grouting holes.

[0011] As a further technical solution, the grouting pipe is fixed in the grouting hole by epoxy mortar or quick-drying cement.

[0012] As a further technical solution, the length L of the plane projection of the cavity is ≤2 meters, and the width B is ≤2 meters. Several of the grouting holes are opened at the highest point of the tunnel arch and are arranged along the length direction of the tunnel. The spacing between adjacent grouting holes is ≤1.5m. A gap is set between the arc-shaped protrusion of the grouting pipe and the waterproof layer, and the gap is ≤5mm.

[0013] As a further technical solution, the length L of the plane projection of the cavity is greater than 2 meters, and the width B is less than or equal to 2 meters. Several of the grouting holes are opened at the highest point of the tunnel arch and are arranged along the length direction of the tunnel. The spacing between adjacent grouting holes is less than or equal to 1.5m, and the arc-shaped protrusion of the grouting pipe is in contact with the waterproof layer.

[0014] As a further technical solution, the length L of the plane projection of the cavity is greater than 2 meters, and the width B is greater than 2 meters. A number of grouting holes are arranged in multiple rows on the tunnel vault, the middle row is located at the highest point of the tunnel vault, and the other rows are symmetrically arranged on both sides of the middle row, and the end grouting holes of adjacent rows are staggered; the spacing between adjacent grouting holes in each row is ≤1.5m, and the arc-shaped protrusion of the grouting pipe is in contact with the waterproof layer.

[0015] As a further technical solution, the distance between the end grouting holes of the middle row and the edge of the cavity in the length direction is smaller than the distance between the end grouting holes of the adjacent rows on both sides and the edge of the cavity in the length direction.

[0016] As a further technical solution, a cement reinforcement layer is arranged in the cavity.

[0017] As a further technical solution, a chemical slurry anti-seepage layer is also provided above the cement reinforcement layer.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model improves the structure of the top of the grouting pipe, and sets it to a wavy top composed of arc-shaped protrusions and arc-shaped grooves. Compared with the grouting pipe with a flat top and a cross-shaped notch in the prior art, the top line of the grouting pipe is smooth, and even if it abuts against the waterproof layer, it will not damage the waterproof layer, thereby solving a series of problems in the prior art caused by the inability of the grouting pipe to abut against the waterproof layer.

[0020] The utility model sets two arc-shaped protrusions and two arc-shaped grooves, thereby ensuring that the size of the arc-shaped groove is large enough and the shape thereof has little resistance to the grouting material, making it easy for the cement-type large-particle grouting material to flow out.

[0021] The utility model arranges different grouting holes and grouting pipes for different cavities, which standardizes the distribution of grouting holes and improves the stability of cavity repair quality compared with the traditional technology of setting the grouting hole positions based on experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a grouting pipe in one embodiment of the utility model;

[0023] Figure 2 for Figure 1 A magnified image of point A;

[0024] Figure 3 It is a structural schematic diagram (cross section) of a grouting structure for a small cavity in one embodiment of the utility model;

[0025] Figure 4 Another structural schematic diagram (longitudinal section) of the grouting structure with small cavities in one embodiment of the utility model;

[0026] Figure 5 This is a schematic diagram of the distribution of grouting holes for small cavities in one embodiment of the utility model;

[0027] Figure 6 A schematic diagram of the structure of the grouting structure when the cavity is hollow in one embodiment of the utility model (cross section);

[0028] Figure 7 Another structural schematic diagram (longitudinal section) of the grouting structure when the cavity is hollow in one embodiment of the utility model;

[0029] Figure 8 This is a schematic diagram of the distribution of grouting holes when the cavity is hollow in one embodiment of the utility model;

[0030] Fig. 9 A schematic diagram of the structure of the grouting structure when there is a large cavity in one embodiment of the utility model (cross section);

[0031] Fig.10Another structural schematic diagram (longitudinal section) of the grouting structure at another angle when there is a large cavity in one embodiment of the utility model;

[0032] Fig.11 This is a schematic diagram of the distribution of grouting holes when there is a large cavity in one embodiment of the utility model;

[0033] Fig.12 A schematic diagram of the structure after the cavity grouting repair is completed in one embodiment of the utility model (cross section);

[0034] In the figure, 1. pipe body, 2. arc-shaped protrusion, 3. arc-shaped groove, 4. serrated ring, 5. valve, 6. waterproof layer, 7. primary support structure, 8. cavity, 9. secondary lining structure, 10. grouting hole, 11. grouting pipe, 12. cement reinforcement layer, 13. chemical slurry anti-seepage layer. DETAILED DESCRIPTION

[0035] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The present invention will be described in further detail below with reference to the accompanying drawings.

[0039] Embodiment 1:

[0040] like Figure 1-2 An embodiment of a grouting pipe of the utility model shown includes a pipe body 1 with a grouting channel, and a plurality of arc-shaped protrusions 2 and a plurality of arc-shaped grooves 3 are arranged on the top of the pipe body 1 along the circumference, and the arc-shaped protrusions 2 and the arc-shaped grooves 3 are arranged alternately, so that the whole is wavy. The utility model improves the structure of the top of the grouting pipe 11, and sets it to a wavy top composed of arc-shaped protrusions 2 and arc-shaped grooves 3. Compared with the grouting pipe 11 with a flat top and a cross-shaped notch in the prior art, the top line of the grouting pipe 11 is smooth, and even if it abuts against the waterproof layer 6, it will not damage the waterproof layer 6, thereby solving a series of problems caused by the inability of the grouting pipe 11 to abut against the waterproof layer 6 in the prior art.

[0041] As an embodiment of a grouting pipe of the utility model, the arc-shaped protrusion 2 and the arc-shaped groove 3 are both 2 in number and have the same shape and size. The utility model sets the arc-shaped protrusion 2 and the arc-shaped groove 3 to 2 in number, thereby ensuring that the size of the arc-shaped groove 3 is large enough and its shape has little resistance to the grouting material, making it easy for large cement-type grouting materials to flow out.

[0042] As an embodiment of a grouting pipe of the utility model, the height of the arc-shaped protrusion 2 or the depth of the arc-shaped groove 3 is 8-10 mm.

[0043] As an embodiment of a grouting pipe of the utility model, a plurality of serrated rings 4 are provided at the tail of the pipe body 1, which improves the connection strength between the grouting pipe 11 and the grouting hose connected to the grouting machine, and avoids the grouting hose from coming out of the grouting pipe 11 during the grouting process.

[0044] As an embodiment of a grouting pipe of the utility model, the pipe body 1 is further provided with a valve 5 for opening or closing the grouting channel.

[0045] As an embodiment of a grouting pipe of the utility model, the valve 5 is a ball valve.

[0046] As an embodiment of a grouting pipe of the utility model, the outer diameter of the grouting pipe 11 is 20-22 mm or 14 mm; when the outer diameter of the grouting pipe is 20-22 mm, it can be used for grouting of cement slurry or chemical slurry, and when the outer diameter of the grouting pipe is 14 mm, it can only be used for grouting of chemical slurry.

[0047] Embodiment 2:

[0048] like Figure 3-11An embodiment of the utility model of a tunnel vault cavity backfill grouting structure is shown, comprising a cavity 8 arranged between a tunnel vault waterproof layer 6 and a secondary lining structure 9, a plurality of grouting holes 10 opened on the secondary lining structure 9 and connected to the cavity 8, a grouting pipe 11 arranged in the grouting hole 10, the grouting pipe 11 also serving as an exhaust pipe and a return grouting pipe, comprising a pipe body 1 with a grouting channel, a plurality of arc-shaped protrusions 2 and a plurality of arc-shaped grooves 3 are arranged on the top of the pipe body 1 along the circumference, the arc-shaped protrusions 2 and the arc-shaped grooves 3 are alternately arranged to make the whole body wavy.

[0049] As an embodiment of the utility model of a tunnel vault cavity backfill grouting structure, the grouting pipe 11 is fixedly arranged in the grouting hole 10 by epoxy mortar or quick-drying cement, which can not only realize the fixation of the grouting pipe 11, but also realize the sealing of the gap between the grouting pipe 11 and the grouting hole 10. The epoxy mortar and quick-drying cement are both commercially available products and belong to the prior art.

[0050] As an embodiment of a tunnel vault cavity backfill grouting structure of the utility model, there are two arc-shaped protrusions 2 and two arc-shaped grooves 3, and they are the same in shape and size.

[0051] As an embodiment of the tunnel vault cavity backfill grouting structure of the utility model, the height of the arc-shaped protrusion 2 or the depth of the arc-shaped groove 3 is 8-10 mm.

[0052] As an embodiment of a grouting pipe of the utility model, the outer diameter of the grouting pipe 11 is 20-22 mm or 14 mm; when the outer diameter of the grouting pipe is 20-22 mm, it can be used for grouting of cement slurry or chemical slurry, and when the outer diameter of the grouting pipe is 14 mm, it can only be used for grouting of chemical slurry.

[0053] As an embodiment of a tunnel vault cavity backfill grouting structure of the utility model, a plurality of serrated rings 4 are provided at the tail of the pipe body 1, which improves the connection strength between the grouting pipe 11 and the grouting hose connected to the grouting machine, and avoids the grouting hose from escaping from the grouting pipe 11 during the grouting process.

[0054] As an embodiment of the tunnel vault cavity backfill grouting structure of the utility model, the pipe body 1 is further provided with a valve 5 for opening or closing the grouting channel.

[0055] As an embodiment of the tunnel vault cavity backfill grouting structure of the utility model, the valve 5 is a ball valve.

[0056] As an embodiment of a tunnel vault cavity backfill grouting structure of the utility model, the plane projection length L of the cavity 8 is ≤2 meters, and the width B is ≤2 meters. This is a small cavity. At this time, as shown in 3-5, several grouting holes 10 are opened at the highest point of the tunnel vault and are arranged along the length direction of the tunnel. The spacing between adjacent grouting holes 10 is ≤1.5m, and a gap is set between the arc-shaped protrusion 2 of the grouting pipe 11 and the waterproof layer 6, and the gap is ≤5mm.

[0057] As an embodiment of the utility model of a tunnel vault cavity backfill grouting structure, the plane projection length L of the cavity 8 is greater than 2 meters, and the width B is less than 2 meters. This is a hollow cavity. At this time, Figure 6-8 As shown, the plurality of grouting holes 10 are opened at the highest point of the tunnel vault and are arranged along the length direction of the tunnel. The spacing between adjacent grouting holes 10 is ≤1.5m. The arc-shaped protrusion 2 of the grouting pipe 11 abuts against the waterproof layer 6.

[0058] As an embodiment of a tunnel vault cavity backfill grouting structure of the utility model, the plane projection length L of the cavity 8 is greater than 2 meters, and the width B is greater than 2 meters. This is a large cavity. At this time, as shown in 9-11, a plurality of grouting holes 10 are arranged in multiple rows on the tunnel vault, the middle row is located at the highest point of the tunnel vault, and the other rows are symmetrically arranged on both sides of the middle row, and the end grouting holes of adjacent rows are staggered; the spacing between adjacent grouting holes in each row is ≤1.5m, and the arc-shaped protrusion of the grouting pipe is in contact with the waterproof layer.

[0059] As a further technical solution, the distance between the end grouting holes of the middle row and the edge of the cavity in the length direction is smaller than the distance between the end grouting holes of the adjacent rows on both sides and the edge of the cavity in the length direction.

[0060] As a further technical solution, Figure 9-11 As shown, the length L of the plane projection of the cavity 8 is greater than 2 meters, and the width B is greater than 2 meters. This is a large cavity 8. At this time, as shown in 9-11, a number of grouting holes 10 are arranged in 3 rows on the tunnel vault. The grouting holes in the middle row are located at the highest point of the tunnel vault, and the other 2 rows are symmetrically arranged on both sides of the middle row. The distance between the end grouting holes of the middle row and the edge of the cavity in the length direction is less than or equal to 0.6m, and the distance between the end grouting holes of the two rows on both sides and the edge of the cavity in the length direction is less than or equal to 1.0m.

[0061] Different grouting holes 10 and grouting pipes 11 are distributed and arranged in different cavities 8 in the present invention. Compared with the traditional technology of setting the positions of the grouting holes 10 based on experience, the distribution of the grouting holes 10 is standardized and the stability of the repair quality of the cavities 8 is improved.

[0062] As an embodiment of the utility model of a tunnel vault cavity backfill grouting structure, Fig.12 As shown, a cement reinforcement layer 12 is provided in the cavity;

[0063] As an embodiment of the utility model of a tunnel vault cavity backfill grouting structure, Fig.12 As shown, a chemical slurry anti-seepage layer 13 is also provided above the cement reinforcement layer 12. After the void treatment is completed, the utility model performs chemical slurry anti-seepage grouting treatment between the secondary lining concrete structure and the waterproof layer to form the chemical slurry anti-seepage layer 13, thereby improving the waterproof and anti-seepage performance of the concrete secondary lining structure and improving the durability of the secondary lining structure.

[0064] As an embodiment of the utility model of a tunnel vault cavity backfill grouting structure, a primary support structure 7 is also arranged above the waterproof layer 6, and the primary support structure 7 adopts a reinforced concrete primary support structure;

[0065] As an embodiment of the utility model of a tunnel vault cavity backfill grouting structure, the secondary lining structure 9 is a concrete secondary lining structure;

[0066] As an embodiment of a tunnel vault cavity backfill grouting structure of the utility model, the waterproof layer 6 adopts any one of a waterproof board waterproof layer 6, an asphalt waterproof membrane waterproof layer 6, an ECB waterproof layer 6, a HDBP waterproof layer 6, and an EV waterproof layer 6.

[0067] The method for backfilling and grouting a tunnel vault cavity 8 using the utility model comprises the following steps:

[0068] Step 1: Use a geological radar detector to detect the range of the concrete cavity 8 to determine the range of the secondary lining arch concrete cavity 8;

[0069] Step 2: design the number and arrangement of the grouting holes 10 according to the size of the cavity 8, and drill the grouting holes 10;

[0070] Step 3, placing the grouting pipe 11 in the grouting hole 10, the distance between the grouting pipe 11 and the waterproof layer 6 is set according to regulations, and then epoxy mortar or quick-drying cement is used to pour the gap between the grouting pipe 11 and the grouting hole 10, and the grouting pipe 11 is sealed and fixed after solidification;

[0071] Step 4, perform steady-pressure grouting, the grouting slurry is cement slurry to form a cement reinforcement layer 12. During grouting, if there are multiple rows of grouting pipes 11, grouting is first performed from the low position on both sides to the high position, and the grouting of the next row is performed after grouting one row; when grouting each row of grouting pipes 11, grouting is performed in sequence, and other adjacent grouting pipes 11 that are not in the grouting state are used for exhaust. During grouting, when the adjacent grouting pipes 11 return grouting, the grouting is stopped; after the slurry penetrates, secondary grouting can be performed;

[0072] Step 5: If necessary, chemical slurry grouting is also required to form a chemical slurry anti-seepage layer 13 above the cement reinforcement layer 12; when performing chemical slurry grouting, the grouting holes and grouting pipes set in the above steps 2-3 can be used, or the grouting holes can be newly opened and the grouting pipes can be set in the same manner as in steps 2-3;

[0073] Step 6: After grouting, an inspection is performed to determine whether the cavity 8 behind the lining has been fully filled.

[0074] The above-mentioned embodiments are only preferred embodiments of the present invention, and are not exhaustive of the feasible implementations of the present invention. For those skilled in the art, any obvious changes made to the present invention without departing from the principle and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.

Claims

1. A grouting pipe, characterized in that: The utility model comprises a pipe body with a grouting channel, wherein a plurality of arc-shaped protrusions and a plurality of arc-shaped grooves are arranged along the circumference of the top of the pipe body, and the arc-shaped protrusions and the arc-shaped grooves are arranged alternately.

2. A grouting pipe according to claim 1, characterized in that: There are two arc-shaped protrusions and two arc-shaped grooves, and they are the same in shape and size.

3. A grouting pipe according to claim 1, characterized in that: The height of the arc-shaped protrusion or the depth of the arc-shaped groove is 8-10 mm.

4. A grouting pipe according to claim 1, characterized in that: The tail of the tube body is provided with a plurality of sawtooth rings.

5. A grouting pipe according to claim 1, characterized in that: The pipe body is also provided with a valve for opening or closing the grouting channel.

6. A tunnel vault cavity backfill grouting structure, characterized in that: It comprises a cavity arranged between the tunnel vault waterproof layer and the secondary lining structure, a plurality of grouting holes opened on the secondary lining structure and connected with the cavity, and a grouting pipe as described in any one of claims 1 to 5 arranged in the grouting holes.

7. The tunnel vault cavity backfill grouting structure according to claim 6, characterized in that: The grouting pipe is fixed in the grouting hole by epoxy mortar or quick-drying cement.

8. The tunnel vault cavity backfill grouting structure according to claim 6, characterized in that: The plane projection of the cavity has a length L≤2 meters and a width B≤2 meters. The plurality of grouting holes are opened at the highest point of the tunnel vault and are arranged along the length direction of the tunnel. The spacing between adjacent grouting holes is ≤1.5m. A gap is provided between the arc-shaped protrusion of the grouting pipe and the waterproof layer, and the gap is ≤5mm. Alternatively, the length L of the plane projection of the cavity is greater than 2 meters, and the width B is less than or equal to 2 meters. The plurality of grouting holes are all opened at the highest point of the tunnel vault and are arranged along the length direction of the tunnel. The spacing between adjacent grouting holes is less than or equal to 1.5 meters. The arc-shaped protrusion of the grouting pipe abuts against the waterproof layer. Alternatively, the length L of the plane projection of the cavity is greater than 2 meters, and the width B is greater than 2 meters. A plurality of grouting holes are arranged in multiple rows on the tunnel vault, with the middle row located at the highest point of the tunnel vault, and the other rows are symmetrically arranged on both sides of the middle row, and the end grouting holes of adjacent rows are staggered; the spacing between adjacent grouting holes in each row is ≤1.5m, and the arc-shaped protrusion of the grouting pipe abuts against the waterproof layer.

9. The tunnel vault cavity backfill grouting structure according to claim 6, characterized in that: A cement reinforcement layer is arranged in the cavity.

10. The tunnel vault cavity backfill grouting structure according to claim 9, characterized in that: A chemical slurry anti-seepage layer is also arranged above the cement reinforcement layer.

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