Grouting device for consolidating sand layer before excavation of subsurface tunnel

Abstract

The utility model relates to the technical field of grouting, and discloses a grouting device for consolidating a sand layer before excavation of a subsurface tunnel, which comprises a feeding barrel, a stirring bin and an outer vertical plate, one end of the feeding barrel is fixedly connected with a motor I, and an output shaft of the motor I is fixedly connected with a pushing propeller. According to the grouting device for consolidating the sand layer before excavation of the subsurface tunnel, uniform conveying of grout is achieved through the pushing propeller arranged in the feeding barrel, the first motor provides stable power to maintain continuous operation, the outer vertical plate and the support form a double-supporting structure, the overall stability is enhanced, and operation vibration is reduced; a receiving hopper is matched with a mounting plate to realize efficient flow guide of slurry and quick connection of a conveying hose, and a grouting head ensures that the slurry is accurately injected into a target area; the S-shaped stirring paddle additionally arranged at the top of the stirring bin and the scraping paddle have a synergistic effect, and multi-dimensional shearing force is formed through driving of the second motor, so that the mixing uniformity of a sand layer and slurry is improved, and attached materials can be scraped to prevent precipitation and caking.

Description

Technical Field

[0001] This utility model relates to the field of grouting technology, specifically a grouting device for consolidating sand layers before excavation of underground tunnels. Background Technology

[0002] In mined tunnel construction, sand layers (especially water-rich fine sand layers) pose a core challenge to construction safety due to their loose and highly permeable nature. While traditional grouting reinforcement techniques can improve ground stability, they still have significant limitations in practical applications.

[0003] Conventional cement-water glass two-component grout has difficulty effectively penetrating into the pores of sand layers due to the large particle size and poor rheological properties, resulting in low strength and uneven distribution of the consolidated body. Traditional advanced small-diameter pipe grouting requires frequent adjustments to the pipe angle, causing severe disturbance to the sand layer during installation and easily leading to local collapses. At the same time, the installation of long pipes requires multiple segmented grouting, which is complex and inefficient. Existing grouting devices are mostly designed for clay or fractured rock layers and lack structural optimization for sand layer characteristics. The industry has attempted to improve the results through material improvements (such as modified water glass grout) and process innovations (such as forward segmented grouting). However, existing technologies still have shortcomings in the following aspects:

[0004] The structural design flaws make the connection between the grouting head and the delivery pipeline prone to sealing failure due to sand abrasion, and there is a lack of anti-backflow structure for grout returning to the sand layer; it relies on manual adjustment of grouting parameters and cannot automatically optimize the grouting scheme based on real-time monitoring data (such as flow rate and pressure fluctuations); traditional equipment is bulky and difficult to adapt to the narrow working space in the tunnel, affecting the construction progress.

[0005] Therefore, it is necessary to propose a grouting device for consolidating sand layers before excavation of mined tunnels. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a grouting device for consolidating sand layers before excavation of underground tunnels. It features easy replacement of the grouting head and the connection between the grouting head and the delivery pipeline, control over the grouting flow rate, and convenient mobility to adapt to the narrow working space inside the tunnel, thus solving the problems mentioned in the background art.

[0007] This utility model provides the following technical solution: a grouting device for consolidating sand layers before excavation of a tunnel, comprising a feeding cylinder, a mixing chamber, and outer uprights. One end of the feeding cylinder is fixedly connected to a motor, and the output shaft of the motor is fixedly connected to a push propeller located inside the feeding cylinder. Two outer uprights are fixedly connected to the surface of the feeding cylinder. The mixing chamber is fixedly connected to the top of one of the outer uprights. A receiving hopper is fixedly connected to the bottom of the mixing chamber. The bottom of the receiving hopper is fixedly connected to one end of the top of the feeding cylinder. An installation plate is provided on the end of the feeding cylinder away from the motor. A conveying hose is fixedly connected to the side of the installation plate, and a grouting head is fixedly connected to the end of the conveying hose.

[0008] Preferably, a crossbeam is fixedly connected to the top of the mixing chamber, a second motor is fixedly connected to the upper surface of the crossbeam, and an agitator is fixedly connected to the output shaft of the second motor. The agitator has an S-shaped design.

[0009] Preferably, a scraper is fixedly connected to the bottom end of the stirring paddle, and the bottom end of the scraper abuts against the inner bottom of the stirring chamber.

[0010] Preferably, a bracket is fixedly connected to the side of the outer panel, and the top of the bracket abuts against the bottom of the mixing chamber.

[0011] Preferably, the bottom end of the outer panel is fixedly equipped with casters.

[0012] Preferably, one end of the feeding cylinder is fixedly connected to an installation ring, the surface of the installation ring is provided with a gourd groove, one side surface of the mounting plate is fixedly connected to a threaded post, the threaded post is movably inserted into the inside of the gourd groove, the surface of the threaded post is threadedly connected to a nut, one side of the nut is tightly abutting against the back of the installation ring.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This grouting device, used for consolidating sand layers before excavation of underground tunnels, achieves uniform grout delivery through a built-in pusher propeller in the feeding cylinder. A single motor provides stable power to maintain continuous operation. The external upright plate and support frame form a double-support structure, enhancing overall stability and reducing operational vibration. The receiving hopper and mounting plate work together to efficiently guide the grout flow and quickly connect the delivery hose. The grouting head ensures precise injection of the grout into the target area. An S-shaped mixing blade and scraper added to the top of the mixing chamber work together, driven by a second motor to generate multi-dimensional shearing force, improving the mixing uniformity of the sand layer and grout, and scraping off adhering materials to prevent sedimentation and clumping. The moving wheels give the device flexible mobility to adapt to the complex working conditions of underground tunnels. The adjustable mechanism composed of a gourd groove and threaded column, combined with a nut locking function, supports rapid adaptation of the delivery hose's installation angle and height, significantly improving construction compatibility and efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the device of this utility model;

[0017] Figure 2 This is a cross-sectional view of the mixing chamber of this utility model;

[0018] Figure 3 This is a cross-sectional view of the feeding cylinder of this utility model;

[0019] Figure 4 This is a schematic diagram of the mounting plate structure of this utility model.

[0020] The attached diagram lists the components represented by each number as follows:

[0021] 100. Feeding cylinder; 101. Receiving hopper; 102. Motor 1; 103. Push propeller; 104. Mounting ring; 105. Hoist trough;

[0022] 200. Mixing bin; 201. Crossbeam; 202. Motor II; 203. Mixing paddle; 204. Scraper;

[0023] 300. Exterior panel; 301. Casters; 302. Bracket;

[0024] 400. Mounting plate; 401. Delivery hose; 402. Grouting head; 403. Threaded post; 404. Nut. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Reference Figures 1-4As shown, a grouting device for consolidating sand layers before excavation of a tunnel includes a feeding cylinder 100, a mixing chamber 200, and an outer vertical plate 300. A motor 102 is fixedly connected to one end of the feeding cylinder 100, and a push propeller 103 is fixedly connected to the output shaft of the motor 102. The push propeller 103 is located inside the feeding cylinder 100. There are two outer vertical plates 300, both fixedly connected to the surface of the feeding cylinder 100. The mixing chamber 200 is fixedly connected to the top of one of the outer vertical plates 300. A receiving hopper 101 is fixedly connected to the bottom of the mixing chamber 200. The bottom of the receiving hopper 101 is fixedly connected to one end of the top of the feeding cylinder 100. An installation plate 400 is provided on the end of the feeding cylinder 100 away from the motor 102. A conveying hose 401 is fixedly connected to the side of the installation plate 400, and a grouting head 402 is fixedly connected to the end of the conveying hose 401. The feeding cylinder 100 can uniformly transport slurry, the motor 102 provides stable power to drive the propeller 103 to rotate, the outer plate 300 enhances the overall structural stability of the device and supports the mixing chamber 200, the receiving hopper 101 realizes efficient slurry diversion, the mounting plate 400 facilitates the connection of the conveying hose 401, and the grouting head 402 ensures that the slurry is accurately injected into the target area.

[0027] In a further preferred embodiment, a crossbeam 201 is fixedly connected to the top of the mixing chamber 200, and a second motor 202 is fixedly connected to the upper surface of the crossbeam 201. An agitator 203, with an S-shaped design, is fixedly connected to the output shaft of the second motor 202. The crossbeam 201 strengthens the top structure of the mixing chamber 200, and the second motor 202 drives the S-shaped agitator 203 to generate multi-dimensional shear force, improving the uniformity of mixing between the sand layer and the slurry.

[0028] In a further preferred embodiment, a scraper 204 is fixedly connected to the bottom end of the stirring paddle 203, and the bottom end of the scraper 204 abuts against the inner bottom of the mixing chamber 200. The scraper 204 is in close contact with the inner bottom of the mixing chamber 200, effectively removing adhering materials and preventing sedimentation and agglomeration, thus maintaining the stability of the stirring efficiency.

[0029] In a further preferred embodiment, a bracket 302 is fixedly connected to the side of the outer panel 300, and the top of the bracket 302 abuts against the bottom of the mixing chamber 200. The bracket 302 forms a three-point support structure for the outer panel 300 and the mixing chamber 200, reducing the vibration amplitude during device operation and extending the service life of key components.

[0030] Preferably, the bottom end of the outer panel 300 is fixedly equipped with a movable wheel 301. The movable wheel 301 gives the device flexible mobility, adapts to the complex working environment of mined tunnels, and improves the efficiency of adjusting the construction position.

[0031] In a further preferred embodiment, one end of the feeding cylinder 100 is fixedly connected to an installation ring 104. The surface of the installation ring 104 has a gourd groove 105. A threaded post 403 is fixedly connected to one side of the mounting plate 400. The threaded post 403 is movably inserted into the gourd groove 105. A nut 404 is threadedly connected to the surface of the threaded post 403, and one side of the nut 404 tightly abuts against the back of the installation ring 104. The gourd groove 105 and the threaded post 403 constitute an adjustable connection mechanism. Combined with the locking function of the nut 404, this allows for rapid adaptation of the installation angle and height of the conveying hose 401, enhancing the compatibility of the device.

[0032] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A grouting device for consolidating sand layers before excavation of a tunnel, comprising a feeding cylinder (100), a mixing chamber (200), and an outer vertical plate (300), characterized in that: One end of the feeding cylinder (100) is fixedly connected to a motor (102), and the output shaft of the motor (102) is fixedly connected to a push propeller (103). The push propeller (103) is located inside the feeding cylinder (100). There are two outer vertical plates (300), both of which are fixedly connected to the surface of the feeding cylinder (100). The mixing chamber (200) is fixedly connected to the top of one of the outer vertical plates (300). The bottom end of the mixing chamber (200) is fixedly connected to a receiving hopper (101). The bottom end of the receiving hopper (101) is fixedly connected to one end of the top of the feeding cylinder (100). An installation plate (400) is provided on the end of the feeding cylinder (100) away from the motor (102). A conveying hose (401) is fixedly connected to the side of the installation plate (400). An injection head (402) is fixedly connected to the end of the conveying hose (401).

2. The grouting device for consolidating sand layers before excavation of a mined tunnel according to claim 1, characterized in that: A crossbeam (201) is fixedly connected to the top of the mixing chamber (200), and a second motor (202) is fixedly connected to the upper surface of the crossbeam (201). The output shaft of the second motor (202) is fixedly connected to a stirring paddle (203), which is S-shaped.

3. A grouting device for consolidating sand layers before excavation of a mined tunnel, as described in claim 2, characterized in that: The bottom end of the stirring paddle (203) is fixedly connected to a scraper (204), and the bottom end of the scraper (204) abuts against the inner bottom of the stirring chamber (200).

4. A grouting device for consolidating sand layers before excavation of a mined tunnel, as described in claim 1, characterized in that: A bracket (302) is fixedly connected to the side of the outer panel (300), and the top of the bracket (302) abuts against the bottom of the mixing chamber (200).

5. A grouting device for consolidating sand layers before excavation of a mined tunnel, as described in claim 1, characterized in that: The bottom end of the outer panel (300) is fixedly equipped with a movable wheel (301).

6. A grouting device for consolidating sand layers before excavation of a mined tunnel, as described in claim 1, characterized in that: One end of the feeding cylinder (100) is fixedly connected to an installation ring (104). The surface of the installation ring (104) is provided with a gourd groove (105). One side surface of the mounting plate (400) is fixedly connected to a threaded post (403). The threaded post (403) is movably inserted into the inside of the gourd groove (105). The surface of the threaded post (403) is threadedly connected to a nut (404). One side of the nut (404) is tightly abutted against the back of the installation ring (104).

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