A sleeve type grouting water stop for bedrock interface

Abstract

The utility model relates to the field of geotechnical engineering grouting technology discloses a sleeve type grouting water stop for bedrock interface, it includes grouting pipe and plugging mechanism, the plugging mechanism includes the outer sleeve of setting in the outside of grouting pipe and setting two rubber stoppers on the outer sleeve, and the annular flow channel is formed between grouting pipe and the outer sleeve. The area between two rubber stoppers on the outer sleeve is provided with the grout hole of intercommunication annular flow channel, and the rubber stopper is provided with the small channel, is used for guiding grout to enter under initial grouting pressure and makes it radial expansion. The utility model discloses through first using initial pressure to make rubber stopper expansion, forms the airtight annular grouting cavity at bedrock interface, then forces grout to inject into the airtight cavity from the grout hole, solves the problem that grout is easy to lose in the prior art, and the filling compactness is low, greatly improves grout utilization and the reliability of water stop effect.

Description

Technical Field

[0001] This utility model relates to the field of grouting technology in geotechnical engineering, and in particular to a sleeve-type grouting water stopper for bedrock interfaces. Background Technology

[0002] In large-scale underground engineering projects such as water conservancy and hydropower, tunnel transportation, and deep foundation pits, the interface between the concrete structure and the bedrock is a critical link in the waterproofing system and also the weakest point most prone to leakage. To ensure the long-term stability and safety of the project, this interface usually needs to be grouted to seal any gaps and cavities and isolate the seepage path of groundwater.

[0003] Currently, the common method for treating such interfaces is grouting, which involves directly pumping cement grout or chemical grout into the borehole. Technicians drill holes at the surface or inside the structure, penetrating the concrete structure and reaching the bedrock interface below. Grout is then injected into the hole through grouting pipes. This method can fill and reinforce the interface area to some extent.

[0004] However, in practical applications, the surfaces of structures such as concrete curtain walls are relatively flat, while the surfaces of natural bedrock are often uneven and varied, resulting in extremely complex interface morphology. When using traditional open grouting, the flowing grout lacks effective restraint after reaching the interface, making it difficult to establish and maintain sufficient grouting pressure in the target area. The grout easily leaks and spreads along larger, unsealed channels, causing not only significant material waste but, more importantly, failing to ensure that the grout is effectively injected into the tiny cracks that most need sealing. This results in severely insufficient filling density, making it difficult to guarantee the water-stopping effect and leaving potential leakage risks in the project.

[0005] Therefore, this utility model proposes a sleeve-type grouting water stopper for bedrock interfaces to overcome the shortcomings of the prior art. Utility Model Content

[0006] In view of the problems in the existing technology, when grouting the bedrock interface, the lack of effective grout confinement means leads to difficulty in establishing grouting pressure, grout leakage, low filling density, and unreliable water-stopping effect. The present invention aims to provide a sleeve-type grouting water stopper for the bedrock interface with an improved structure that can effectively solve the above problems.

[0007] This utility model provides a sleeve-type grouting water stopper for bedrock interfaces, including a grouting pipe and a sealing mechanism; the sealing mechanism includes an outer sleeve and at least two rubber plugs.

[0008] The outer sleeve is coaxially fitted around the grouting pipe, and an annular flow channel is formed between the inner wall of the outer sleeve and the outer wall of the grouting pipe. The outer wall of the outer sleeve is provided with recessed holes spaced apart along its axial direction, and a rubber plug is embedded in each recessed hole.

[0009] The core structure of this water stopper is that the outer sleeve has a grout outlet hole on its wall, which is connected to the annular flow channel, and the grout outlet hole is located between two adjacent rubber plugs. At the same time, a micro-channel is provided on the rubber plug, which is used to guide the grout into the inner side of the rubber plug under the initial grouting pressure, causing it to expand radially.

[0010] Preferably, the sleeve-type grouting stopper for bedrock interfaces also includes a protective mechanism, which is fixedly connected to the top of the grouting pipe.

[0011] Furthermore, the protection mechanism includes rubber column a and rubber column b, which are stacked vertically along the axial direction of the grouting pipe.

[0012] Preferably, there are multiple slurry outlet holes, and these multiple slurry outlet holes are evenly distributed along the circumference of the outer sleeve.

[0013] Preferably, the rubber plug is a hollow annular structure.

[0014] Preferably, the concave hole is an annular groove formed around the outer wall of the outer sleeve.

[0015] In one specific implementation, the number of rubber plugs is two.

[0016] Preferably, the microchannel connects the annular flow channel to the hollow inner cavity of the rubber plug.

[0017] This utility model has the following beneficial effects:

[0018] 1. This utility model, by setting two rubber plugs that can expand radially under initial grouting pressure, pre-forms a closed annular grouting cavity at the interface between the bedrock and the curtain, solving the problem of serious grout loss and diffusion caused by the inability to effectively limit the grouting range in the prior art, and achieving the technical effect of accurately sealing the target area and significantly improving the grout utilization rate.

[0019] 2. This utility model solves the problem in the prior art that the grout cannot fully fill the tiny gaps and the filling density is not high due to the difficulty in establishing and maintaining pressure, by forcibly injecting high-pressure grout from the grout outlet located between two rubber plugs into a closed annular grouting cavity. It achieves the technical effect of forcibly filling all cavities and cracks with grout, thereby forming a high-quality water-stopping effect.

[0020] 3. This utility model solves the problem that existing grouting equipment is easily damaged by external impacts due to the exposed pipe opening at the construction site, thus affecting normal use, by setting a protective mechanism made of rubber columns at the top of the grouting pipe. It achieves the technical effect of effectively buffering external impacts, enhancing the durability of the equipment structure, and extending the overall service life. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of a sleeve-type grouting water stopper for bedrock interface proposed in this utility model;

[0022] Figure 2 This is a schematic diagram of the grout outlet of a sleeve-type grouting stopper for bedrock interfaces proposed in this utility model.

[0023] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 This is a schematic diagram of the outer sleeve of a sleeve-type grouting water stopper for bedrock interfaces proposed in this utility model.

[0025] Legend:

[0026] 1. Grouting pipe; 2. Sealing mechanism; 21. Rubber plug; 22. Outer sleeve; 23. Grout outlet hole; 24. Bedrock layer; 25. Curtain layer; 3. Protection mechanism; 31. Rubber column a; 32. Rubber column b; 4. Concave hole. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0028] Example:

[0029] Please refer to Figures 1 to 4 This utility model provides a sleeve-type grouting stopper for bedrock interfaces, which aims to solve the problems of grout loss and low filling density caused by the difficulty in forming an effective sealed space when dealing with bedrock interfaces in existing grouting technologies. Figure 1As shown, the sleeve-type grouting water stopper for bedrock interfaces generally includes a centrally located grouting pipe 1, a sealing mechanism 2 coaxially sleeved on the grouting pipe 1, and a protective mechanism 3 fixedly connected to the top of the grouting pipe 1. The sealing mechanism 2, as the core component for achieving precise water stopping, includes an outer sleeve 22 and at least two rubber plugs 21. Specifically, an annular flow channel is formed between the inner wall of the outer sleeve 22 and the outer wall of the grouting pipe 1, providing a pathway for the grout to be transported from the grouting pipe 1 to the outside. (Refer to...) Figure 4 On the outer wall of the outer sleeve 22, recesses 4 are spaced apart along its axial direction, and a rubber plug 21 is embedded in each recess 4. Figure 2 and Figure 3 As shown, the core structure of the device is that a grout outlet 23 is provided on the wall of the outer sleeve 22 in the area between two adjacent rubber plugs 21. The grout outlet 23 is directly connected to the annular flow channel. At the same time, a micro-channel is provided on each rubber plug 21. One end of the micro-channel is connected to the annular flow channel, and the other end is connected to the hollow inner cavity of the rubber plug 21. This structural design ensures that during the initial grouting, the grout can preferentially enter the rubber plug 21 and expand, thereby forming a reliable seal on both sides of the grout outlet 23.

[0030] As a supplement and optimization to the above structure, please refer to Figure 1 and Figure 3 The sleeve-type grouting stopper for bedrock interfaces also includes a protective mechanism 3, which forms a stable fixed connection with the aforementioned grouting pipe 1. Specifically, the protective mechanism 3 is fixedly connected to the top end of the grouting pipe 1 away from the sealing mechanism 2. The protective mechanism 3 includes rubber columns a31 and b32, which are stacked vertically along the axial direction of the grouting pipe 1. This structure is used to buffer external impacts during equipment use, preventing damage to the port of the grouting pipe 1, thereby improving the durability and service life of the equipment. To further clarify the preferred structure of the sealing mechanism 2, refer to... Figure 1 and Figure 4 The rubber plug 21 is a hollow annular structure, and the recess 4 in which it is embedded is an annular groove that surrounds the outer wall of the outer sleeve 22. This matching structure of the annular groove and the annular body ensures the precise positioning of the rubber plug 21 during installation and provides stable support when it is under pressure and expands. In addition, there are multiple grout outlet holes 23 on the outer sleeve 22, and these multiple grout outlet holes 23 are evenly distributed along the circumference of the outer sleeve 22. This uniform distribution structure is conducive to the uniform extrusion of grout from the grout outlet holes 23, ensuring a balanced pressure distribution in the annular grouting cavity formed between the bedrock layer 24 and the curtain layer 25, thereby improving the compactness of the filling.

[0031] Based on the above embodiments, the present invention may further include the following preferred technical solutions:

[0032] In one specific implementation, the number of rubber plugs 21 is preferably two. These two rubber plugs 21 are arranged axially at intervals along the outer sleeve 22, thereby defining a ring-shaped grouting area of ​​a defined length at the interface between the bedrock layer 24 and the curtain layer 25, achieving precise control of the grouting range. As a further optimization of the sealing function, the specific structure of the microchannel is a through hole penetrating the wall thickness of the rubber plug 21. This through hole directly connects the annular flow channel between the grouting pipe 1 and the outer sleeve 22 as well as the hollow inner cavity of the rubber plug 21, ensuring that the grout pressure can be transmitted to the interior of the rubber plug 21 without obstruction, thereby achieving its reliable radial expansion sealing function.

[0033] The working principle is as follows:

[0034] During grouting, high-pressure grout is pumped into the grouting pipe 1 from the outside and enters the annular flow channel formed between the grouting pipe 1 and the outer casing 22. Under the initial pressure, the grout first enters the hollow cavity of the rubber plug 21 through the tiny channels opened on the rubber plug 21, causing the two rubber plugs 21 to expand radially outward under pressure. One rubber plug 21 tightly presses against the upper curtain layer 25, while the other tightly presses against the surface of the lower bedrock layer 24. This forms a closed annular grouting cavity between the two rubber plugs 21 and at the interface between the outer casing 22 and the bedrock layer 24 and curtain layer 25. As the grouting pressure further increases, a large amount of grout is forcefully squeezed out from the grout outlet 23 located between the two rubber plugs 21 and forcibly filled into the closed annular grouting cavity until all gaps and cavities in the cavity are completely filled and compacted, ultimately efficiently solving the leakage problem at the bedrock interface.

[0035] In addition, throughout the installation and use process, the protective mechanism 3, which is fixedly connected to the top of the grouting pipe 1, can effectively absorb and buffer external impacts through its rubber columns a31 and b32, protecting the integrity of the port of the grouting pipe 1, ensuring the stable and reliable function of the equipment in conveying grout, and extending the service life of the overall device.

Claims

1. A sleeve-type grouting water stopper for bedrock interface, comprising a grouting pipe (1) and a sealing mechanism (2); The sealing mechanism (2) includes an outer sleeve (22) and at least two rubber plugs (21) and a curtain layer (25); The outer sleeve (22) is coaxially sleeved on the outer periphery of the grouting pipe (1), and an annular flow channel is formed between the inner wall of the outer sleeve (22) and the outer wall of the grouting pipe (1). The curtain layer (25) is sleeved on the outside of the grouting pipe (1), and the bottom of the curtain layer (25) is fixed with a bedrock layer (24). The outer sleeve (22) has recessed holes (4) spaced apart along its axial direction on its outer wall, and each recessed hole (4) is fitted with a rubber plug (21); Its features are, The outer sleeve (22) has a slurry outlet hole (23) on its wall. The slurry outlet hole (23) is connected to the annular flow channel, and the slurry outlet hole (23) is located between two adjacent rubber plugs (21). Furthermore, a microchannel is provided on the rubber plug (21) to guide the grout into the inner side of the rubber plug (21) under the initial grouting pressure, causing it to expand radially.

2. The sleeve-type grouting stopper for bedrock interfaces according to claim 1, characterized in that, The water stopper also includes a protection mechanism (3), which is fixedly connected to the top of the grouting pipe (1).

3. The sleeve-type grouting stopper for bedrock interfaces according to claim 2, characterized in that, The protection mechanism (3) includes rubber column a (31) and rubber column b (32), which are stacked vertically along the axial direction of the grouting pipe (1).

4. The sleeve-type grouting stopper for bedrock interfaces according to claim 1, characterized in that, The number of the slurry outlet holes (23) is multiple, and the multiple slurry outlet holes (23) are evenly distributed along the circumference of the outer sleeve (22).

5. The sleeve-type grouting stopper for bedrock interfaces according to claim 1, characterized in that, The rubber plug (21) is a hollow ring structure.

6. The sleeve-type grouting stopper for bedrock interfaces according to claim 1, characterized in that, The recess (4) is an annular groove formed around the outer wall of the outer sleeve (22).

7. The sleeve-type grouting stopper for bedrock interfaces according to claim 1, characterized in that, The number of rubber plugs (21) is two.

8. The sleeve-type grouting stopper for bedrock interfaces according to claim 1, characterized in that, The microchannel connects the annular flow channel to the hollow inner cavity of the rubber plug (21).

Images