Pressure steel pipe backfill grouting structure

Abstract

The utility model belongs to the technical field of backfill grouting, and particularly discloses a penstock backfill grouting structure which comprises two sets of grouting pipelines pre-buried between tunnel surrounding rock and a penstock lining, and the two sets of grouting pipelines are arranged on the two sides of the top of a tunnel section respectively. Each group of grouting pipelines comprises a grout inlet pipe, a grout return pipe and a plurality of grouting branches; the slurry inlet pipe and the slurry return pipe are arranged in parallel and are communicated, and the slurry inlet pipe is close to the pressure steel pipe lining; one end of each grouting branch is communicated with the grout inlet pipe, and the other end of each grouting branch extends into the surrounding rock. According to the backfill grouting structure, holes do not need to be reserved in the pressure steel pipe, radial reinforcement of the holes is not needed, damage to the pressure steel pipe can be reduced, operation is easy, and the construction period can be greatly shortened. Furthermore, the two groups of grouting pipelines are arranged on the two sides of the top of the section of the tunnel, so that a cavity between the pressure steel pipe lining and the surrounding rock can be fully filled with grout, and the backfill grouting effect is good.

Description

TECHNICAL FIELD

[0001] The utility model discloses a pressure steel pipe backfill grouting structure belongs to backfill grouting technical field. BACKGROUND

[0002] The pressure steel pipe backfill grouting is the method of filling the cavity between the surrounding concrete and the surrounding rock of the pressure steel pipe, which fills the slurry in the cavity between the surrounding concrete and the surrounding rock of the pressure steel pipe, so that the surrounding concrete and the surrounding rock form an integral structure, and then the stability and durability are improved.

[0003] The traditional concrete backfill grouting, surrounding rock consolidation grouting and steel pipe contact grouting need to reserve openings on the pressure steel pipe and carry out radial reinforcement of the orifice, and the manufacturing and hole sealing welding process of the pressure steel pipe are complex, the requirements for the environmental temperature and humidity are higher, and the construction period is not favorable. SUMMARY

[0004] The utility model discloses a pressure steel pipe backfill grouting structure to solve the technical problem of complex process and inconvenient construction caused by reserving openings on the pressure steel pipe in the prior art.

[0005] The utility model provides a pressure steel pipe backfill grouting structure, including two groups of grouting pipelines that are embedded between the surrounding rock of tunnel and pressure steel pipe lining, two groups of grouting pipelines are arranged at the both sides of the top of tunnel section respectively,

[0006] Each group of grouting pipelines includes grout inlet pipe, grout return pipe and multiple grouting branches,

[0007] The grout inlet pipe and the grout return pipe are arranged side by side and communicated, and the grout inlet pipe is close to the pressure steel pipe lining,

[0008] One end of the multiple grouting branches is communicated with the grout inlet pipe, and the other end extends into the surrounding rock.

[0009] Preferably, each grouting branch includes grouting branch pipe and multiple grout outlet pipes,

[0010] One end of the grouting branch pipe is connected with the grout inlet pipe, and the other end extends into the surrounding rock,

[0011] The multiple grout outlet pipes are arranged on the pipe body of the grouting branch pipe and communicated with the grouting branch pipe.

[0012] Preferably, one end of the grouting branch pipe extending into the surrounding rock is provided with an exhaust groove.

[0013] Preferably, the diameter of the grout outlet pipe is smaller than the diameter of the grout inlet pipe.

[0014] Preferably, the diameter of the grout inlet pipe is greater than or equal to 5cm.

[0015] Preferably, the grouting branch pipe extends into the surrounding rock to a depth greater than or equal to 10 cm.

[0016] Preferably, the plurality of grouting branches are arranged on the grout inlet pipe in sequence, and the spacing between adjacent grouting branches is less than or equal to 2 m.

[0017] Preferably, the two groups of grouting pipes are symmetrically arranged on both sides of the top of the tunnel section.

[0018] The included angle between the grout inlets of the two grout inlet pipes is greater than 120°.

[0019] Preferably, the material of the grouting pipe is PVC.

[0020] The pressure steel pipe backfill grouting structure of the utility model has the following beneficial effects compared with the prior art:

[0021] The pressure steel pipe backfill grouting structure of the utility model does not need to reserve an opening on the pressure steel pipe and radially reinforce the orifice, can reduce damage to the steel pipe, and is simple to operate and can greatly save construction period.

[0022] The two groups of grouting pipes of the utility model are symmetrically arranged on both sides of the top of the tunnel section, and a plurality of grouting branches are arranged along the tunnel axis, so that the cavity between the pressure steel pipe lining and the surrounding rock can be fully filled with grout, and the backfill grouting effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The utility model discloses a pressure steel pipe backfill grouting structure.

[0024] Figure 2 It is Figure 1 The A-A section view.

[0025] In the drawing: 1, grout inlet pipe; 2, grouting branch pipe; 3, grout outlet pipe; 4, grout return pipe; 5, exhaust groove; 6, pressure steel pipe lining; 7, surrounding rock. DETAILED DESCRIPTION

[0026] In the following description, specific details are set forth such as particular system configurations, techniques, etc., in order to provide a thorough understanding of the embodiments of the utility model. However, it should be apparent to those skilled in the art that the utility model can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted in order to not obscure the description of the utility model with unnecessary detail.

[0027] The utility model embodiment provides a pressure steel pipe backfill grouting structure, such as Figure 1 And Figure 2As shown, the two groups of grouting pipes are pre-embedded between the surrounding rock 7 and the pressure steel pipe lining 6 of the tunnel, and are arranged on both sides of the top of the tunnel section. Each group of grouting pipes comprises a grouting inlet pipe 1, a grouting return pipe 4 and a plurality of grouting branches. The grouting inlet pipe 1 and the grouting return pipe 4 are arranged side by side and communicate with each other, and the grouting inlet pipe 1 is close to the pressure steel pipe lining 6. One end of the plurality of grouting branches communicates with the grouting inlet pipe 1, and the other end extends into the surrounding rock 7. In order to ensure the uniformity of grouting, the plurality of grouting branches of the utility model are arranged on the grouting inlet pipe 1 in sequence, and the spacing between adjacent grouting branches is less than or equal to 2m.

[0028] The pressure steel pipe lining 6 is obtained by pouring concrete on the pressure steel pipe as a formwork for pouring concrete. The pressure steel pipe not only plays a role in resisting internal pressure, but also serves as a formwork for pouring concrete. The utility model combines the pressure steel pipe lining 6 with the grouting pipe, which can significantly enhance the overall stability of the tunnel.

[0029] The utility model extends one end of the grouting branch into the surrounding rock 7, so as to inject the grout into the surrounding rock 7. The grout reacts chemically or physically with the surrounding rock 7, improves the mechanical properties of the surrounding rock 7, improves its bearing capacity and stability, and prevents the surrounding rock 7 from gushing and seeping, ensuring the safety of the tunnel.

[0030] The utility model uses two groups of grouting pipes arranged on both sides of the top of the tunnel section to realize backfill grouting between the surrounding rock 7 and the pressure steel pipe lining 6 of the entire tunnel. The backfill grouting is uniform and fast, the grouting effect is good, and there is no need to reserve openings on the pressure steel pipe and perform radial reinforcement on the openings, which can reduce the damage to the pressure steel pipe and save the construction period.

[0031] In order to ensure the uniformity and stability of grouting, each grouting branch in the utility model embodiment comprises a grouting branch pipe 2 and a plurality of grouting outlet pipes 3. One end of the grouting branch pipe 2 is connected with the grouting inlet pipe 1, and the other end extends into the surrounding rock 7. The plurality of grouting outlet pipes 3 are arranged on the pipe body of the grouting branch pipe 2 and communicate with the grouting branch pipe 2. The utility model uses a plurality of grouting outlet pipes 3 communicating with the grouting branch pipe 2 to realize uniform grouting at different positions and avoid the concentration of grout in one place.

[0032] In order to ensure that the air in the grouting pipe can be smoothly discharged and avoid affecting the uniformity of grouting, one end of the grouting branch pipe 2 extending into the surrounding rock 7 is provided with an air vent 5.

[0033] In order to facilitate the smooth flow of grout, the diameter of the grouting outlet pipe 3 is smaller than the diameter of the grouting inlet pipe 1, and the diameter of the grouting inlet pipe 1 is greater than or equal to 5cm, so as to appropriately increase the pressure.

[0034] The depth of the grouting branch pipe 2 extending into the surrounding rock 7 is greater than or equal to 10 cm, so that the grouting branch pipe 2 can grout to the deep part of the surrounding rock 7, and the pressure steel pipe lining 6 and the surrounding rock 7 are connected as an integral structure, and the stability of the tunnel is improved.

[0035] The two groups of grouting pipelines are symmetrically arranged on the two sides of the top of the tunnel section, and the included angle between the grouting inlets of the two grouting pipes 1 is greater than 120 degrees at this time.

[0036] The PVC material is corrosion-resistant, can resist the corrosion of various chemical substances such as acid, alkali and salt, and is suitable for humid or highly corrosive environments, so the material of the grouting pipeline is preferably PVC.

[0037] The construction method of the pressure steel pipe backfill grouting structure is as follows:

[0038] Step 1, before installing the pressure steel pipe, two groups of grouting pipelines are pre-buried on the two sides of the top of the tunnel section, and the grouting pipelines are closely attached to the rock wall of the surrounding rock 7 of the tunnel;

[0039] Step 2, after the grouting pipeline is fixed, the grouting pipe 3 and the exhaust groove 5 are bound and sealed with kraft paper, so as to avoid the blockage of the pipe opening by the concrete poured when the pressure steel pipe lining 6 is prepared.

[0040] Step 3, install the pressure steel pipe, which is a steel lining, and then pour concrete to obtain the pressure steel pipe lining 6.

[0041] After the strength of the poured concrete reaches 70%, backfill grouting is carried out, and the grouting pressure is not less than 0.3 MPa.

[0042] The backfill grouting is carried out by injecting slurry into the side of the pressure steel pipe lining 6 through the grouting pipe 1, and the water-cement ratio of the slurry can be 1 or 0.5. The slurry reaches the grouting pipe 3 through the grouting branch pipe 2 to carry out backfill grouting between the lining concrete and the surrounding rock 7. When the cavity is filled with slurry, the grouting pipe 3 and the exhaust groove 5 cannot discharge slurry, and the slurry fills the grouting branch pipe 2 and returns to the grouting pipe 4. It is considered that the grouting is completed, and the grouting pipe 4 for returning the outwardly returned slurry should be closed and coagulated. After 7 days of backfill grouting, check is carried out, the slurry with a water-cement ratio of 2:1 is injected into the hole, and the injection amount is not more than 10 L within 10 min under the specified pressure, which is considered to be qualified for backfill grouting.

[0043] The pressure steel pipe backfill grouting structure of the utility model does not need to reserve openings on the pressure steel pipe and radially reinforce the openings, can reduce the damage to the steel pipe, and is simple to operate, and can greatly save the construction period.

[0044] The two groups of grouting pipes are symmetrically arranged on the two sides of the top of the tunnel section, and multiple grouting branches are arranged along the tunnel axis, so that the cavity between the slurry and the surrounding rock 7 can be fully filled, and the backfill grouting effect is good.

[0045] The above is only a few embodiments of the present application, and does not limit the present application in any form. Although the present application is disclosed in the preferred embodiments, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the disclosed technical content without departing from the scope of the present application, and equivalent implementation cases are equivalent to equivalent implementation cases, which are within the scope of the technical scheme.

Claims

1. A pressure steel pipe backfill grouting structure, characterized by, Two groups of grouting pipes are embedded between the surrounding rock and the pressure steel pipe lining, and are arranged on both sides of the top of the tunnel section; Each group of grouting pipes comprises a grouting inlet pipe, a grouting return pipe and a plurality of grouting branches; The grouting inlet pipe and the grouting return pipe are arranged in parallel and are in communication, and the grouting inlet pipe is close to the pressure steel pipe lining; One end of the plurality of grouting branches is in communication with the grouting inlet pipe, and the other end extends into the surrounding rock.

2. The pressure pipe backfill grouting structure according to claim 1, characterized by, Each grouting branch comprises a grouting branch pipe and a plurality of grouting outlet pipes; One end of the grouting branch pipe is connected to the grouting inlet pipe, and the other end extends into the surrounding rock; The plurality of grouting outlet pipes are arranged on the pipe body of the grouting branch pipe and are in communication with the grouting branch pipe.

3. The pressure pipe backfill grouting structure according to claim 2, characterized by, The end of the grouting branch pipe extending into the surrounding rock is provided with an exhaust groove.

4. The pressure pipe backfill grouting structure according to claim 2, characterized by, The diameter of the grouting outlet pipe is smaller than the diameter of the grouting inlet pipe.

5. The pressure pipe backfill grouting structure according to claim 4, characterized by, The diameter of the grouting inlet pipe is greater than or equal to 5 cm.

6. The pressure pipe backfill grouting structure according to claim 2, characterized by, The depth of the grouting branch pipe extending into the surrounding rock is greater than or equal to 10 cm.

7. The pressure pipe backfill grouting structure according to claim 1, characterized by, The plurality of grouting branches are arranged on the grouting inlet pipe in sequence, and the spacing between adjacent grouting branches is less than or equal to 2 m.

8. The pressure pipe backfill grouting structure according to claim 1, characterized by, The two groups of grouting pipes are symmetrically arranged on both sides of the top of the tunnel section; The included angle between the grouting inlets of the two grouting inlet pipes is greater than 120°.

9. The pressure pipe backfill grouting structure according to claim 1, characterized by, The material of the grouting pipes is PVC.

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