A circular grouting test device for synchronous grouting tests

Abstract

This invention discloses a circular grouting test device for synchronous grouting tests, belonging to the category of shield tunneling simulation equipment. The device includes a base with an arc-shaped groove, and a cylindrical box matching the arc-shaped groove, the box being able to rotate freely. Inside the cylindrical box is a partial prototype, which includes an arc-shaped shield shell, a tail brush, and tunnel segments arranged sequentially. The two ends of the partial prototype are detachably fixed to the side walls of the box, and the width of the partial prototype is less than the height of the box. Using a partial prototype to simulate the synchronous grouting process is more accurate and relatively low-cost.

Description

Technical Field

[0001] This invention relates to a shield tunneling simulation device, and more particularly to a circular grouting test device for synchronous grouting tests. Background Technology

[0002] A tunnel boring machine (TBM) is a type of tunnel boring machine that uses the shield tunneling method to lay supporting segments while excavating. When the segments separate from the tail of the shield, a gap will inevitably form between the segments and the soil due to the structure of the TBM itself. Therefore, grouting needs to be carried out simultaneously in a timely manner to prevent the soil around the segments from loosening and collapsing, and to increase the stability of the segments, avoiding stress concentration and instability.

[0003] Due to the complexity of the soil, the wide variety of grout types available, and the high cost of tunnel boring machines (TBMs), current technologies typically employ simulation experiments to model the synchronous grouting process. Because TBMs are large, typically with a diameter of 6–18 meters, prototype simulations are costly and difficult to operate. Therefore, current technologies often use scaled-down simulations, where the TBM is scaled down proportionally before synchronous grouting simulation experiments. However, since the soil, grout, and other materials and their adjustments cannot be scaled down, the results obtained from the scaled-down simulation deviate from the actual results. Summary of the Invention

[0004] To address at least one of the aforementioned problems, this invention provides a circular grouting test device for synchronous grouting tests, which uses a local prototype to simulate the synchronous grouting process, resulting in greater accuracy and relatively lower cost.

[0005] The technical solution of the present invention is: a circular grouting test device for synchronous grouting test, comprising a base, wherein the base is provided with an arc-shaped groove, and a cylindrical box matching the arc-shaped groove is also provided, wherein the box is rotatable; a partial prototype is provided inside the cylindrical box, wherein the partial prototype comprises an arc-shaped shield shell, a shield tail brush and a pipe segment arranged in sequence, wherein the two ends of the partial prototype are detachably fixed to the side wall of the box, and the width of the partial prototype is less than the height of the box.

[0006] One embodiment of the present invention is that the arc-shaped groove is provided with rollers, and the base is provided with a pulling mechanism on both sides to make the box rotate.

[0007] Furthermore, the pulling mechanism includes a winch, on which a pull rope is provided, one end of which is fixed to the side wall of the housing.

[0008] Furthermore, the pulling mechanism includes a chain, with winches at both ends of the chain, and the winches are located on the side wall of the base; the side wall of the housing is provided with a sliding groove around its circumference, and the sliding groove is provided with teeth that match the chain.

[0009] In one embodiment of the present invention, the box body further includes a front cover plate and a rear cover plate, and a soil retaining plate is provided inside the box body. The soil retaining plate divides the space above the partial prototype into two parts, and soil is filled between the soil retaining plate and the rear cover plate.

[0010] Furthermore, both the inner wall of the box and the rear cover are provided with mounting plates, and the mounting plates are provided with sealing grooves. The partial prototype is detachably fixed in the sealing grooves.

[0011] Furthermore, the front cover plate is also provided with a grouting pipe joint and a hydraulic press. The grouting pipe joint is connected to a grouting pipe, which can inject grout into the segment. The hydraulic press is connected to the shield shell through a pull rod.

[0012] Preferably, the width of the partial prototype is no greater than half the height of the box.

[0013] One embodiment of the present invention is that the top of the box is provided with a window.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] This invention, by setting up a local prototype, makes the simulation process closer to the actual shield grouting process, thereby simulating more accurate synchronous grouting simulation data and providing more accurate data support for actual production; at the same time, since the box can rotate freely, the grouting process can be simulated from multiple angles. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the front view of the device;

[0017] Figure 2 Bit Figure 1 A schematic diagram of the structure after removing the front cover plate;

[0018] Figure 3 Left sectional view of the housing;

[0019] Figure 4 Schematic diagram of the mounting plate structure. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0021] In the description of this invention, it should be noted that the terms "upper", "bottom", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as a limitation of this invention.

[0022] See Figures 1-4 A circular grouting test device for synchronous grouting tests includes a base 1 with an arc-shaped groove and a cylindrical box 2 that matches the arc-shaped groove. The box 2 is rotatable. A partial prototype is provided inside the cylindrical box 2. The partial prototype includes an arc-shaped shield 10, a shield tail brush 9, and a pipe segment 8 arranged in sequence. The two ends of the partial prototype are detachably fixed to the side wall of the box 1. The width of the partial prototype is less than the height of the box 1.

[0023] Specifically, the base 1 is used to support the box 2. Since the box 2 is cylindrical, an arc-shaped groove needs to be set on the base 1 so that the box 2 can be placed on the base 1.

[0024] Meanwhile, since the segments 8 need to be assembled into a cylindrical shape in actual operation, the angles of individual segments 8 vary considerably. To simulate grouting at multiple angles, the box 2 is restricted to free rotation. While there are many methods and structures that allow the box 2 to rotate, the current embodiment does not scale down components such as the segments 8 and the shield 9, resulting in a large size and weight. Under these circumstances, conventional manual operation is insufficient to rotate the box 2. Therefore, this embodiment proposes two devices to enable the box 2 to rotate. The rotation referred to here means that the box 2 can rotate around its axis.

[0025] Generally, for the housing 2 to rotate, the friction between the housing 2 and the arc-shaped groove on the base 1 cannot be too high. If the friction is too high, even with external components to rotate the housing 2, the difficulty of rotation and power loss increases because the housing 2 must overcome the friction between itself and the arc-shaped groove. Therefore, rollers 5 are installed inside the arc-shaped groove. When the housing 2 rotates, the rollers 5 rotate accordingly, transforming the sliding friction between the housing 2 and the arc-shaped groove into rolling friction between the housing 2 and the rollers 5. This reduces friction and thus reduces the energy loss caused by overcoming it.

[0026] In order to make the box 2 rotate, a pulling mechanism 3 is provided on both sides of the base 1 to make the box 2 rotate.

[0027] Existing technologies contain numerous components capable of rotating the housing 2. However, since this device is a partial simulation of the synchronous grouting process and not a scaled-down version, the housing 2 is large in size and weight. Conventional methods are difficult to adapt. Therefore, this embodiment proposes two traction mechanisms 3 to rotate the housing 2.

[0028] In some embodiments, winches are provided on both sides of the base 1 to rotate the housing 2. Considering the size of the housing, at least two winches are provided on each side of the base. At the same time, a pull rope is provided on each winch. One end of the pull rope is attached to the winch, and the other end is fixed to the side wall of the housing. Generally speaking, in order to enable the base to rotate to a larger angle, one end of the pull rope is usually fixed to the bottom of the housing around the upper part of the housing. Under the action of the winches and the pull rope, the housing can rotate to a larger angle. At the same time, when the housing needs to return to its original position after the experiment, the winches are started to rotate the housing 2 by the corresponding angle.

[0029] In some embodiments, winches are also provided on both sides of the base, and at least two winches are provided on each side of the base. However, unlike the previous traction mechanism 3, when one winch is provided on one side of the plane containing a cross-section of the housing 2, a corresponding winch is also provided on the other side of the housing 2. That is, either no winches are provided on the plane containing a cross-section of the housing 2, or two winches are provided, and these two winches are respectively provided on both sides of the base. At the same time, the pull rope in the previous traction mechanism 3 is replaced with a chain, and a corresponding sliding groove is provided around its circumference on the side wall of the housing, with teeth in the sliding groove corresponding to the chain. Those skilled in the art will understand that the number of sliding grooves is equal to the number of chains, and also the same as the number of winches on the same side of the base 1. When the housing 2 needs to be rotated, only the winches on the same side of the base need to be activated.

[0030] Since this embodiment is a non-scaled partial model, a partial prototype is also provided inside the housing 2. From top to bottom, the partial prototype includes the shield shell 10, the tail brush 9, and the tunnel segment 8. Similar to actual production, the partial prototype is entirely curved; that is, the shield shell 10, the tail brush 9, and the tunnel segment 8 are all curved. The dimensions of the tunnel segment 8 are the same as the dimensions of a single tunnel segment 8 in an actual tunnel boring machine. Furthermore, to reduce costs, a single tunnel segment 8 (with a typical curvature of 45°) and correspondingly sized shield shell 10 and tail brush 9 are typically used as the partial prototype.

[0031] Since this embodiment simulates the synchronous grouting process of a tunnel boring machine (TBM), while in actual grouting, soil under pressure needs to be placed above the shield shell 10, a front cover plate and a rear cover plate are also provided in this embodiment to facilitate the experiment. A retaining plate 13 is also provided between the front cover plate 201 and the rear cover plate 202. The retaining plate 13 is composed of two arcs, with the radius of the upper arc being the same as the inner diameter of the box 2, and the radius of the lower arc being the same as the radius of the shield shell 10. The upper part of the retaining plate 13 is fixed to the box 2, and the lower part is attached to the upper surface of the shield shell 10. During the experiment, soil is filled between the rear cover plate 202 and the retaining plate 13.

[0032] Meanwhile, to facilitate the placement of the partial prototype inside the housing 2, the width of the partial prototype is limited to be less than the height of the housing 2. In this embodiment, the width of the partial prototype refers to its axial height, not its arc length; the height of the housing 2 refers to its height when it is a cylinder, not its diameter or radius.

[0033] To facilitate disassembly and assembly before and after the experiment, the partial prototype is detachably and fixedly installed inside the housing 2. In this embodiment, the detachable and fixed installation means that the device can be disassembled under certain circumstances, but after it is installed, the position of the partial prototype relative to the housing 2 will not change.

[0034] Those skilled in the art will know that there are various methods to achieve the aforementioned detachable fixing, such as bolt connection. However, since this device is used to simulate synchronous grouting, it is necessary to ensure a corresponding seal. Therefore, this embodiment proposes a component for fixing a local prototype. This component includes a mounting plate 4, which is provided on both the inner wall of the housing 2 and the rear cover plate 202. A sealing groove 401 is provided in the mounting plate 4. An arc-shaped surface of the local prototype is detachably fixed in the sealing groove 401 of the rear cover plate 202, and two straight edges of the local prototype are detachably fixed in the sealing groove 401 of the inner wall of the housing 2. To ensure a seal, a sealing gasket can also be provided in the sealing groove 401. To ensure that the pipe segment is not pulled out when the shield shell 10 is pulled during grouting, the pipe segment 8 can be fixed to the mounting plate 4 with bolts.

[0035] Since this device is used to simulate the synchronous grouting process, it is natural that the shield shell 10 needs to be pulled to form the shield tail gap during the experiment, and grouting pipe 12 is also needed to grout it. Therefore, in this embodiment, at least one hydraulic press 6 is provided on the front cover plate 201, and correspondingly, a corresponding pulling connector 11 is provided on the shield shell. The pulling rod of the hydraulic press 6 is connected to the pulling connector 11 to simulate the process of the shield shell 10 separating from the segment. At the same time, a grouting pipe joint 7 is also provided on the front cover plate. One end of the grouting pipe joint 7 is connected to the grouting pipe 12. Similar to the actual engineering, the grouting pipe 12 is connected to the inside of the shield shell 10, and a grouting pipe outlet is provided at the tail of the shield shell 10. When the shield shell 10 is pulled to form the shield tail gap, grouting is performed synchronously on the shield tail gap.

[0036] Meanwhile, since the hydraulic press 6 and the grouting pipe joint 7 are both set on the front cover plate 201 in this embodiment, in order to facilitate the complete pulling out of the shield shell 10 and avoid the front cover plate 201 affecting the pulled-out shield shell 10, in this embodiment, the width of the local prototype is limited to no more than half the height of the box body 2. In this way, even if the shield shell 10 is completely pulled out, it will not affect the normal operation of the entire equipment.

[0037] To facilitate soil injection, windows 14 are provided at the top of the box 2, through which soil can be injected into the box 2. At the same time, corresponding sealing devices are provided for these windows 14, which can be sealed after a certain amount of soil is filled to avoid affecting the subsequent pressurization process.

[0038] Meanwhile, a pressurization pipe is also provided at the top of the box 2. Through the pressurization pipe, the soil inside the box 2 can be pressurized, thereby pressurizing the shield 10 and the segment 8. In this embodiment, water pressurization is selected, that is, a water injection pressurization pipe is set at the top of the box 2.

[0039] During use, the tunnel segments 8 and shield shell 10 are installed and filled with soil. Pressure is then applied for the experiment. Once the soil pressure reaches a certain value, the shield shell 10 is pulled by the hydraulic press 6 to create a tail gap, and grouting begins simultaneously to simulate the synchronous grouting process. When it is necessary to simulate the synchronous grouting process of tunnel segments 8 at different angles, simply activate the pulling mechanism 3 to rotate the housing 2.

[0040] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the embodiments of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A circular grouting test device for synchronous grouting tests, characterized in that, The device includes a base with an arc-shaped groove and a cylindrical box that matches the arc-shaped groove. The box can rotate freely. Inside the cylindrical box is a partial prototype, which includes an arc-shaped shield shell, a tail brush, and a tube segment arranged in sequence. The two ends of the partial prototype are detachably fixed to the side wall of the box, and the width of the partial prototype is less than the height of the box. The box also includes a front cover plate and a rear cover plate. A soil retaining plate is also provided inside the box. The soil retaining plate divides the space above the partial prototype into two parts, and soil is filled between the soil retaining plate and the rear cover plate. The inner wall of the box and the rear cover are both provided with mounting plates, and the mounting plates are provided with sealing grooves. The partial prototype is detachably fixed in the sealing grooves. The front cover plate is also provided with a grouting pipe joint and a hydraulic press. The grouting pipe joint is connected to a grouting pipe, which can inject grout into the segment. The hydraulic press is connected to the shield shell through a pull rod.

2. The apparatus according to claim 1, characterized in that, The arc-shaped groove is equipped with rollers, and the base is provided with a pulling mechanism on both sides to make the box rotate.

3. The apparatus according to claim 2, characterized in that, The pulling mechanism includes a winch, on which a pull rope is provided, one end of which is fixed to the side wall of the housing.

4. The apparatus according to claim 2, characterized in that, The pulling mechanism includes a chain, with winches at both ends of the chain, and the winches are located on the side wall of the base; the side wall of the housing is provided with a sliding groove around its circumference, and the sliding groove is provided with teeth that match the chain.

5. The apparatus according to claim 1, characterized in that, The width of the local prototype is no greater than half the height of the box.

6. The apparatus according to claim 1, characterized in that, The top of the enclosure has a window.

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