Crushed surrounding rock water stop grouting structure capable of applying stress

Abstract

The invention discloses a broken surrounding rock water stop grouting structure capable of applying stress. The broken surrounding rock water stop grouting structure comprises an auxiliary sleeve, a grouting pipe, a tray, a fastening nut, a first film bag, a second film bag and the like. Wherein the grouting pipe is sleeved with the auxiliary sleeve, a gap is formed between the auxiliary sleeve and the grouting pipe, the lower end of the grouting pipe is located below a lower port of the auxiliary sleeve, and liquid outlet holes are formed in the pipe wall of the grouting pipe. The tray covers the upper end of the auxiliary sleeve, and the upper end of the grouting pipe penetrates through the tray and then is in threaded connection with the fastening nut. The first film bag is arranged on the outer side wall of the auxiliary sleeve in a sleeving mode and fixedly connected with the auxiliary sleeve, the second film bag is arranged on the outer side wall of the grouting pipe in a sleeving mode and located below the auxiliary sleeve, and the lower end of the second film bag is communicated with the second film bag. The water stop grouting structure has the functions of remark grouting and an anchor rod, so that the two targets of reinforcing and water leakage blocking are completed at the same time, the field workload can be effectively reduced, and the engineering construction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel reinforcement engineering, and particularly to a water-stop grouting structure for fractured surrounding rock capable of applying stress. Background Art

[0002] When excavating a tunnel in a water-rich fractured surrounding rock area, due to the existence of rock mass fissures, groundwater often continuously pours into the tunnel. In traditional drill-and-blast construction, affected by the blasting operation of the next excavation cycle, the surrounding rock of the excavated section is disturbed, and the water-stop structure formed by grouting in the previous cycle is affected, resulting in water leakage in some vaults. In addition, the rock mass at the vault part is prone to local peeling and falling blocks, which has an adverse impact on the construction of the next stage. Grouting, as the main means to deal with water leakage in the tunnel during construction, is widely used in the tunnel engineering field. It realizes the plugging of water leakage by filling the surrounding rock with a slurry that can be solidified in the subsequent process. In addition, grouting in fractured rock and soil can also improve the integrity of the tunnel surrounding rock, thereby enhancing the stability of the surrounding rock and ensuring the safety of tunnel excavation.

[0003] Traditional grouting methods usually take water-stop or reinforcement as the main goal, and the grouting steel pipes currently widely used in the current engineering field cannot apply stress. Therefore, the commonly used reinforcement method for stratum deformation or instability is bolt support, which can fully mobilize the self-bearing capacity of the rock and soil mass. However, for water-rich and fractured surrounding rock, simple bolt support cannot achieve the effect of plugging water leakage, resulting in difficulty in simultaneously achieving the two goals of reinforcement and plugging water leakage for such surrounding rock. Summary of the Invention

[0004] In view of the above problems, the present invention provides a water-stop grouting structure for fractured surrounding rock capable of applying stress, which combines the functions of grouting and bolts, thereby simultaneously achieving the two goals of reinforcement and plugging water leakage, and can effectively reduce the on-site workload and accelerate the engineering construction efficiency. Specifically, the technical solution of the present invention is as follows.

[0005] A stress-applicable water-stop grouting structure for fractured surrounding rock, comprising: an auxiliary casing, a grouting pipe, a tray, a fastening nut, a first membrane bag, a second membrane bag, a first feed pipe, and a second feed pipe. Among them: The auxiliary casing is sleeved outside the vertically arranged grouting pipe and there is a gap between the two. The lower end of the grouting pipe is located below the lower port of the auxiliary casing, and liquid outlet holes are provided on the pipe wall of this part of the grouting pipe. The upper port of the auxiliary casing has a flange plate with an opening on its disk surface. The groove-shaped tray covers the flange plate therein, and the upper end of the grouting pipe passes through the tray and is threadedly connected to the fastening nut. The first membrane bag is sleeved on the outer side wall of the auxiliary casing and the two are fixedly connected. The second membrane bag is sleeved on the outer side wall of the grouting pipe and is located below the auxiliary casing. The liquid outlet holes are located in the lower part of the second membrane bag. The first membrane bag and the second membrane bag are respectively communicated with the first feed pipe and the second feed pipe. Among them, the upper end of the first feed pipe passes through the opening on the flange plate and is located in the tray, and the upper end of the second feed pipe passes through the gap between the auxiliary casing and the grouting pipe and is located in the tray.

[0006] Further, external threads are provided on the side wall of the upper end of the grouting pipe, and it is threadedly connected to the fastening nut.

[0007] Further, the outer diameter of the auxiliary casing is 2 to 4 times the outer diameter of the grouting pipe.

[0008] Further, a gasket is provided between the fastening nut and the tray.

[0009] Further, the first membrane bag is sleeved on the outer side wall of the auxiliary casing, and both ports of the first membrane bag are tied and sealed and fixed on the outer side wall of the auxiliary casing, so as to form a liquid storage cavity between the auxiliary casing and the first membrane bag.

[0010] Further, the second membrane bag is sleeved on the outer side wall of the grouting pipe, and both ports of the second membrane bag are tied and sealed and fixed on the outer side wall of the grouting pipe, so as to form a liquid storage cavity between the grouting pipe and the second membrane bag. The is communicated with this liquid storage cavity.

[0011] Further, a fastening bolt is further included, which is threadedly connected to a threaded hole on the side wall of the fastening nut and abuts against the outer wall of the grouting pipe, so as to increase the firmness of the connection.

[0012] Further, a pressure rod fixed on its top surface is provided in the groove of the tray, and the lower end of the pressure rod abuts against the upper surface of the flange plate.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects: The water-stop grouting structure of the present invention can first inject grout into the surrounding rock for reinforcement through the cooperation of components such as the auxiliary casing, grouting pipe, first membrane bag, and second membrane bag, so as to simultaneously achieve the goals of reinforcement and leakage blocking, effectively reducing the on-site workload and accelerating the project construction efficiency. Moreover, after the grouting is completed and the grout is solidified, a tensile stress can be applied to the grouting pipe by rotating the fastening nut, and then the tray reacts on the surrounding rock to further reinforce the loose soil on the surface of the surrounding rock. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The schematic diagrams in the specification forming a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0015] Figure 1 It is a schematic structural diagram of a water-stop grouting structure for fractured surrounding rock capable of applying stress in the following embodiments.

[0016] Figure 2 It is a schematic structural diagram of an auxiliary casing in the following embodiments.

[0017] The marks in the figure represent: 1 - auxiliary casing, 2 - grouting pipe, 3 - tray, 4 - fastening nut, 5 - first membrane bag, 6 - second membrane bag, 7 - first feed pipe, 8 - second feed pipe, 9 - fastening bolt, 10 - pressure bar, 101 - flange, 102 - opening, 201 - gap, 202 - liquid outlet hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0019] For the convenience of narration, if terms such as "upper", "lower", "left", and "right" appear in the present invention, they only represent the same directions as the upper, lower, left, and right directions of the drawings themselves, and do not limit the structure. They 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 needs to have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention. The technical solutions of the present invention are further described below in conjunction with specific embodiments.

[0020] Reference Figure 1 and Figure 2, an example of a water-stop grouting structure for fractured surrounding rock that can apply stress, includes: an auxiliary casing 1, a grouting pipe 2, a tray 3, a fastening nut 4, a first membrane bag 5, a second membrane bag 6, a first feeding pipe 7 and a second feeding pipe 8. Specifically: The auxiliary casing 1 and the grouting pipe 2 are both vertically arranged, and the auxiliary casing 1 is sleeved outside the grouting pipe 2 with a gap 201 therebetween. The lower end of the grouting pipe 2 extends out of the lower port of the auxiliary casing 1 and extends below it, and liquid outlet holes 202 are provided on the pipe wall of this part of the grouting pipe 2. The upper end of the grouting pipe 2 passes through the upper port of the auxiliary casing 1 and extends above it. The outer diameter of the auxiliary casing 1 is 2 to 4 times the outer diameter of the grouting pipe 2, such as 2 times, 3 times, 3.5 times, 4 times, etc., and other suitable sizes can also be selected according to needs.

[0021] The upper port of the auxiliary casing 1 has a flange 101 with an opening 102 on its disk surface. The grooved tray 3 covers the upper port of the auxiliary casing 1 and its flange 101 therein. The upper end side wall of the grouting pipe 2 has an external thread, and the upper end of the grouting pipe 2 passes through the upper port of the auxiliary casing 1 and the through hole at the center of the tray 3 and is threadedly connected to the fastening nut 4.

[0022] The first membrane bag 5 is a cylinder with both ends open and sleeved on the outer side wall of the auxiliary casing 1, and both ends of the first membrane bag 5 are tied and sealed and fixed on the outer side wall of the auxiliary casing 1, so as to form a liquid storage cavity between the auxiliary casing 1 and the first membrane bag 5. The second membrane bag 6 is sleeved on the outer side wall of the grouting pipe 2 and is located below the auxiliary casing 1. Specifically, the second membrane bag 6 is a cylinder with both ends open and sleeved on the outer side wall of the grouting pipe 2, and both ends of the second membrane bag 6 are tied and sealed and fixed on the outer side wall of the grouting pipe 2, so as to form a liquid storage cavity between the grouting pipe 2 and the second membrane bag 6. The liquid outlet holes 202 are located in the lower part of the second membrane bag 6.

[0023] The first membrane bag 5 and the second membrane bag 6 are respectively communicated with the first feeding pipe 7 and the second feeding pipe 8. Among them, the upper end of the first feeding pipe 7 passes through the opening 102 on the flange 101 and is located in the tray 3, and the upper end of the second feeding pipe 8 passes through the gap 201 between the auxiliary casing 1 and the grouting pipe 2 and is located in the tray 3.

[0024] The process of surrounding rock reinforcement using the water-stop grouting structure for fractured surrounding rock that can apply stress in this example includes: (1) Drill a hole at the part to be reinforced using a drill pipe, the aperture and depth of which match the auxiliary casing 1. Then lower the auxiliary casing 1 and its first membrane bag 5 into the hole. Then inject slurry (such as a quick-setting double-fluid slurry formed by mixing cement and sodium silicate) into the first membrane bag 5 using the first feed pipe 7. After the first membrane bag 5 expands, the auxiliary casing 1 is fixed in the hole, so that the auxiliary casing 1 constructs a stable space, which helps to prevent problems such as collapse of the broken surrounding rock where the auxiliary casing 1 is located during the subsequent drilling process.

[0025] (2) Then lower the drill pipe from the upper port of the auxiliary casing 1 to its bottom and continue drilling. The aperture and depth of this hole match the grouting pipe 2. Then lower the grouting pipe 2 and its second membrane bag 6 into this hole, and the second membrane bag 6 is located at the port of this hole. Then inject slurry into the second membrane bag 6 through the second feed pipe 8. After the second membrane bag 6 expands, the grouting pipe 2 is fixed in the hole. At the same time, due to the blocking effect of the second membrane bag 6 on the upper port of this hole, the slurry injected into the hole by the grouting pipe 2 has a greater pressure, can be distributed and diffused more quickly and concentratedly into the surrounding rock around the hole, improves the grouting efficiency, and can also obtain a larger slurry distribution range. After these slurries solidify, they can play a better role in reinforcing the surrounding rock and plugging water leakage, thus achieving the two goals of reinforcement and water leakage plugging at the same time, reducing the on-site operation volume, and accelerating the project construction efficiency.

[0026] (3) After completion, cover the tray 3 on the port of the grouting pipe 2, and the outer end of the grouting pipe 2 passes through the through hole in the center of the tray 3 and is connected to the fastening nut 4. By continuously tightening the fastening nut 4, the tray 3 is squeezed and fixed on the surrounding rock, and at the same time, the purpose of applying tensile stress to the grouting pipe 2 is achieved, thereby further reinforcing the loose soil on the surface of the surrounding rock.

[0027] In another embodiment, refer to Figure 1 , the water-stop grouting structure of the above embodiment further includes a fastening bolt 9. The side wall of the fastening nut 4 has a threaded hole, and the fastening bolt 9 is threadedly connected to this threaded hole, and one end of the fastening bolt 9 abuts against the outer wall of the grouting pipe 2, so as to connect the grouting pipe 2 and the fastening nut 4 more firmly together.

[0028] In another embodiment, the water-stop grouting structure of the above embodiment further includes a gasket disposed between the fastening nut 4 and the tray 3.

[0029] In another embodiment, refer to Figure 1, the tray 3 of the water-stop grouting structure of the above embodiment further has a pressure bar 10. Specifically, the pressure bar 10 is located in the groove of the tray 3 and fixed on its top surface, and at least two pressure bars 10 are evenly distributed around the grouting pipe 2. When the tray 3 is squeezed and fixed on the surrounding rock by using the fastening nut 4, the lower end of the pressure bar 10 abuts against the upper surface of the flange 101, so as to achieve a better reinforcement effect by the interaction of the extrusion force formed by the tray 3 on the surrounding rock and the extrusion force formed by the flange 101 on the surrounding rock.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stress-applied broken surrounding rock water-stopping grouting structure, characterized in that: include: Grouting pipe; An auxiliary sleeve, which is sleeved on the outside of the vertically arranged grouting pipe with a gap therebetween, the lower end of the grouting pipe is located below the lower end of the auxiliary sleeve, and a liquid outlet hole is provided on the pipe wall of this part of the grouting pipe; The upper end of the auxiliary sleeve has a flange, and the upper end of the auxiliary sleeve has an opening on the plate surface; the groove-shaped tray covers the flange. A fastening nut, wherein the upper end of the grouting pipe passes through the tray and is threadedly connected to the fastening nut; A first film bag, the first film bag is sleeved on the outer side wall of the auxiliary sleeve and the two are in communication; A second film bag, which is sleeved on the outer wall of the grouting pipe and is located below the auxiliary sleeve; the liquid outlet is located at the lower part of the second film bag; A first material delivery pipe, wherein the first film bag is connected to the first material delivery pipe, and the upper end of the first material delivery pipe passes through the opening on the flange and is located in the tray; The second material delivery pipe, the second film bag is connected with the second material delivery pipe, and the upper end of the second material delivery pipe passes through the gap between the auxiliary sleeve and the grouting pipe and is located in the tray.

2. The stress-applied broken surrounding rock water-stopping grouting structure according to claim 1 is characterized in that: The upper end side wall of the grouting pipe is provided with an external thread, which is threadedly connected with the fastening nut.

3. The stress-applied broken surrounding rock water-stopping grouting structure according to claim 1 is characterized in that: A gasket is provided between the fastening nut and the tray.

4. The stress-applied broken surrounding rock water-stopping grouting structure according to claim 1 is characterized in that: The outer diameter of the auxiliary casing is 2 to 4 times the outer diameter of the grouting pipe.

5. The stress-applied broken surrounding rock water-stopping grouting structure according to claim 1 is characterized in that: The first membrane bag is sleeved on the outer side wall of the auxiliary sleeve, and the two ends of the first membrane bag are tied, sealed and fixed on the outer side wall of the auxiliary sleeve, so as to form a liquid storage cavity between the auxiliary sleeve and the first membrane bag.

6. The stress-applied broken surrounding rock water-stopping grouting structure according to claim 1 is characterized in that: The second membrane bag is sleeved on the outer wall of the grouting pipe, and the two ends of the second membrane bag are tied, sealed and fixed on the outer wall of the grouting pipe, so as to form a liquid storage cavity between the grouting pipe and the second membrane bag.

7. The stress-applied broken surrounding rock water-stopping grouting structure according to any one of claims 1 to 6, characterized in that: It also includes a fastening bolt, which is threadedly connected in a screw hole on the side wall of the fastening nut and is pressed against the outer wall of the grouting pipe.

8. The stress-applied broken surrounding rock water-stopping grouting structure according to any one of claims 1 to 6, characterized in that: The groove of the tray is provided with a pressure rod fixed on the top surface thereof, and the lower end of the pressure rod is pressed against the upper surface of the flange.

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