A grouting device and a construction process for tunneling of a shield machine by advanced grouting

Abstract

The application relates to the field of engineering machinery, and particularly discloses a grouting device and a construction process for tunneling advance grouting of a shield machine. The grouting device comprises a grouting plug, a conveying pipe group and a power module, the grouting plug comprises a main body, a slurry flow channel is arranged in the main body, an expansion unit is arranged on the outer side of the main body, an expansion cavity is arranged in the expansion unit, a control joint is arranged at the slurry inlet end, the control joint is communicated with the expansion cavity, the conveying pipe group comprises a slurry conveying pipe and a control pipe, in the working state, the slurry conveying pipe is sleeved on the control pipe, and the control joint is inserted into the slurry conveying pipe. The grouting device is connected with the control joint at the slurry inlet end of the main body, the control pipe can be arranged in the slurry conveying pipe, the pipe diameter of the main body and the matched pipe can be set to be consistent, and the grouting operation is facilitated.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery, and in particular to a grouting device and a construction process for pre-grouting during tunnel boring machine excavation. Background Technology

[0002] In tunnel and underground engineering construction, there is often a need for ground reinforcement and soil improvement. This requires drilling rigs for drilling operations, followed by grouting reinforcement. Commonly used grouting equipment includes grout plugs, delivery pipe assemblies, and matching pressure control and grout injection components. To create sufficient pressure at the grouting location and ensure better grout diffusion in the soil and rock, the grout plug is tightened at a predetermined position before grouting is performed. Especially in soft soil conditions, sufficient pressure is required to ensure adequate grout penetration.

[0003] The basic functions of a grouting plug include conveying grout and tightening it against the grouting hole. Therefore, a grouting plug typically consists of a main body and a tightening unit. The main body contains a grout flow channel for conveying the grout. The tightening unit contains an tightening cavity. During grouting, the pressure inside the tightening cavity increases, and the deformation of the cavity seals against the grouting hole. When the grout enters the grouting hole under external pressure, the sealing effect of the tightening unit prevents the grout from escaping from the hole, allowing pressure to gradually build up at the grouting location and diffuse within the soil and rock, completing the grouting process.

[0004] Because the grouting plug's functions of conveying grout and tightening and sealing need to be controlled independently, corresponding grout conveying pipes and control pipes are required. Therefore, separate interfaces need to be provided on the grouting plug to connect to the grout conveying pipes and control pipes. To accommodate these two interfaces, the radial dimensions of existing grouting plugs are often inconsistent with those of the grout conveying pipes and control pipes; specifically, the radial dimension of the grouting plug is larger. This results in a transition step between the grouting plug and the grout conveying pipe, interfering with the insertion and removal of the grouting plug.

[0005] Furthermore, during tunnel excavation using a tunnel boring machine (TBM), a blowout preventer (BOP) is installed on the TBM's guide tube to prevent external impurities such as mud from entering the TBM's interior, and the grouting pipes are also sealed simultaneously. However, with existing grouting plug structures, the control pipes are typically located outside the grout delivery pipes. This means that two parallel pipes pass through the inner circular channel of the BOP, making it difficult for the BOP to seal both pipes simultaneously, thus affecting the sealing effect. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a grouting device and a construction process for advanced grouting in tunnel excavation of shield machine. The control joint is connected to the grout inlet end of the main body, and the corresponding control pipe can be set inside the grout delivery pipe, so that the pipe diameter of the main body and the matching pipe can be set to be consistent, which provides convenience for grouting operation.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a grouting device, comprising at least:

[0008] The grouting plug includes a main body, one end of which is a grout inlet end; the main body is provided with a grout flow channel, and the grout inlet of the grout flow channel is located at the grout inlet end of the main body; it also includes an expansion unit located on the outside of the main body, the expansion unit being provided with an expansion cavity; and it also includes a control connector located at the grout inlet end, the control connector being connected to the expansion cavity.

[0009] A conveying pipe assembly, comprising slurry conveying pipe fittings and control pipe fittings, wherein the slurry conveying pipe fittings are made of rigid materials;

[0010] The power module includes a pressure control component and a slurry injection component;

[0011] In operation, the slurry conveying pipe fitting is sleeved outside the control pipe fitting; the slurry inlet end of the main body is inserted into one end of the slurry conveying pipe fitting and is sealed to the slurry conveying pipe fitting, and the other end of the slurry conveying pipe fitting is connected to the slurry injection assembly; the control connector extends into the slurry conveying pipe fitting, and one end of the control pipe fitting is sealed to the control connector, and the other end is connected to the pressure control assembly.

[0012] The control joint is located at the grout inlet end, and the corresponding control pipe can be installed inside the grout delivery pipe, which creates conditions for the main body and the matching pipe to have the same pipe diameter, and provides convenience for grouting operation.

[0013] Preferably, the outer side of the main body is provided with a groove; the expansion unit includes an expansion sleeve made of elastic material, which is sleeved on the outer side of the main body and covers the groove; the expansion sleeve is sealed to the main body and together with the groove forms an expansion cavity.

[0014] Preferably, the slurry conveying pipe fitting includes at least one conveying section, and two adjacent conveying sections are detachably connected.

[0015] The control fitting includes at least two control sections, each of which includes a tube body made of flexible material and connecting portions located at both ends of the tube body. Adjacent control sections are detachably connected by the connecting portions.

[0016] The slurry delivery pipes and control pipes are designed in sections, which can well adapt to the needs of different depth conditions. The slurry delivery pipes are made of rigid materials, while the control pipes are made of flexible materials. This allows for adjustment of the length difference between the slurry delivery pipes and control pipes to a certain extent, facilitating the individual assembly and disassembly of the delivery and control sections.

[0017] Preferably, the power module further includes a conversion assembly, which includes a conversion unit. The conversion unit is provided with a first connector and a second connector. The conversion unit is also provided with a first distribution cavity and a second distribution cavity. The first connector is simultaneously connected to the slurry injection assembly and the first distribution cavity, and the second connector is simultaneously connected to the pressure control assembly and the second distribution cavity.

[0018] An adjustment channel is provided between the first distribution cavity and the second distribution cavity; the adapter assembly further includes an adjustment pipe that passes through the adjustment channel and can move axially relative to the adjustment channel; the adjustment pipe and the adjustment channel are axially sealed.

[0019] The transfer unit is also provided with a slurry output interface, which is connected to the first distribution cavity. In the working state, the slurry output interface is sealed to the slurry conveying pipe, one end of the adjusting pipe is sealed to the control pipe, and the other end is freely disposed in the second distribution cavity.

[0020] Preferably, the adjusting pipe is provided with two axial limiting units, and the adjusting pipe can move relative to the adjusting channel between the two axial limiting units.

[0021] Because the slurry delivery pipes and control pipes are set up independently, the lengths of the slurry delivery pipes and control pipes are often inconsistent during actual use, which has a significant impact on the installation and use on the construction site.

[0022] This application compensates for the length error between the slurry conveying pipe and the control pipe by adjusting the axial movement of the pipe relative to the adjustment channel, while ensuring the independent and stable operation of the slurry conveying pipe and the control pipe. The adjustment operation is simple and has great practical value.

[0023] Preferably, the power module further includes a propulsion assembly, which includes a propulsion trolley and a rotary drive. The adapter is mounted on the propulsion trolley, and the rotary drive drives the adapter and the slurry conveying pipe to rotate around an axis.

[0024] Preferably, the adapter unit includes a rotary connecting part; the first connector includes a rotary distributing unit, which is sleeved outside the rotary connecting part and is fixedly arranged in the circumferential direction relative to the pusher trolley.

[0025] The rotary distribution unit and the rotary connection part are axially sealed, and an intermediate cavity is formed between the rotary distribution unit and the rotary connection part. The intermediate cavity is simultaneously connected to the first distribution cavity and the slurry injection assembly.

[0026] Preferably, a drill bit is connected to the end of the main body away from the slurry inlet.

[0027] The adapter can rotate and move axially under the drive of the propulsion component. When used with the drill bit, it can perform drilling operations on the basis of grouting function, realizing integrated drilling and grouting construction, which greatly improves construction efficiency and is especially suitable for construction operations in softer soil and rock.

[0028] A construction process for pre-grouting during tunnel boring machine excavation, employing the grouting equipment described above;

[0029] At least the following steps are included:

[0030] Step 1 Feeding: Use external power to send the grouting plug and delivery pipe assembly into the preset position in the foundation hole to be grouted;

[0031] Step 2: Tightening: The pressure control component pressurizes the tightening cavity through the control fittings, causing the tightening unit to expand outward and tighten within the base hole;

[0032] Step 3 Grouting: The grout injection assembly delivers grout into the foundation hole through the grout delivery pipe and the main body until the grout in the foundation hole reaches the preset pressure value, at which point the grout injection assembly stops working;

[0033] Step 4: Position Adjustment: The pressure control component releases pressure to the expansion chamber through the control fittings, causing the expansion unit to contract; the drill bit and delivery pipe assembly retract a preset distance; repeat steps 2 to 4 until the grouting plug exits the foundation hole, completing the grouting construction process. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the grouting equipment in this embodiment;

[0035] Figure 2 This is a diagram showing the usage status of the grouting equipment in this embodiment;

[0036] Figure 3 This is a schematic diagram of the grouting plug in the grouting equipment of this embodiment;

[0037] Figure 4This is a partial view showing the usage status of the grouting plug in the grouting equipment of this embodiment;

[0038] Figure 5 This is a schematic diagram of the power module in the grouting equipment of this embodiment;

[0039] Figure 6 for Figure 5 A magnified view of a section at point A in the middle;

[0040] Figure 7 This is a partial schematic diagram of the transfer unit in the grouting equipment of this embodiment;

[0041] Figure 8 This is a partial schematic diagram of the transfer unit in the grouting equipment of this embodiment, where the adjusting pipe is in another position. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Example

[0043] like Figure 1 and Figure 2 As shown, a grouting device includes at least a grouting plug 1, a delivery pipe assembly 2, and a power module 3.

[0044] Specifically, such as Figure 3 and Figure 4 As shown, the grouting plug 1 includes a main body 11, one end of which is a grout inlet end 113 and the other end is a grout outlet end 111. The main body 11 is provided with a grout flow channel 112, the grout inlet of which is located at the grout inlet end 113 and the grout outlet at the grout outlet end 111.

[0045] like Figure 3 and Figure 4 As shown, it also includes an expansion unit disposed on the outside of the main body 11, the expansion unit having an expansion cavity 12. Specifically, a groove is formed on the outside of the main body 11, and the expansion unit includes an expansion sleeve 13 made of elastic material, the expansion sleeve 13 being fitted onto the outside of the main body 11 and covering the groove. The expansion sleeve 13 is sealed to the main body 11 and together with the groove forms the expansion cavity 12. During operation, the pressure inside the expansion cavity 12 is adjusted by hydraulic or pneumatic drive. A transition channel 114 is provided inside the main body 11, the transition channel 114 extending axially along the main body 11, and the transition channel 114 is not connected to the slurry flow channel 112.

[0046] like Figure 3 and Figure 4 As shown, it also includes a control connector 15 located at the slurry inlet end 113, which is connected to the expansion chamber 12. It also includes at least one transition pipe 14, one end of which is sealed to the control connector 15, and the other end is connected to the liquid inlet end and the expansion chamber 12 through the transition channel 114.

[0047] Specifically, such as Figure 4 As shown, the conveying pipe assembly 2 includes a slurry conveying pipe fitting 21 and a control pipe fitting 22. The slurry conveying pipe fitting 21 is made of rigid material and includes at least one conveying section. Adjacent conveying sections are detachably connected. By connecting multiple conveying sections, it can adapt to the assembly requirements of boreholes of different depths. Specifically, the side of the slurry inlet end 113 is provided with external threads for connecting to the matching slurry conveying pipe fitting 21.

[0048] The control fitting 22 includes at least two control segments. Each control segment includes a tube body made of flexible material and connecting parts located at both ends of the tube body. Adjacent control segments are detachably connected by the connecting parts.

[0049] The slurry conveying pipe 21 and the control pipe 22 are respectively set in a segmented form, which can well adapt to the needs of different depth working conditions. The slurry conveying pipe 21 is made of rigid material, while the control pipe 22 is made of flexible material. The length difference between the slurry conveying pipe 21 and the control pipe 22 can be adjusted to a certain extent, which facilitates the disassembly and assembly of the conveying segment and the control segment one by one.

[0050] Specifically, such as Figure 5 and Figure 6 As shown, the power module 3 includes a transfer assembly 31, a pressure control assembly, and a slurry injection assembly. The transfer assembly 31 includes a transfer unit 312, which is provided with a first connector and a second connector. The transfer unit 312 also includes a first distribution cavity 311 and a second distribution cavity 313. The first connector is connected to both the slurry injection assembly and the first distribution cavity 311, and the second connector is connected to both the pressure control assembly and the second distribution cavity 313.

[0051] like Figure 7 and Figure 8 As shown, an adjustment channel is provided between the first distribution cavity 311 and the second distribution cavity 313. The adapter assembly 31 also includes an adjustment pipe 315, which passes through the adjustment channel and is axially movable relative to the adjustment channel. The adjustment pipe 315 and the adjustment channel are axially sealed.

[0052] like Figure 7 and Figure 8 As shown, the adapter unit 312 is also provided with a slurry output interface, which is connected to the first distribution chamber 311. In the working state, the slurry output interface is sealed to the slurry conveying pipe 21, one end of the adjusting pipe 315 is sealed to the control pipe 22, and the other end is freely disposed in the second distribution chamber 313.

[0053] In the working state, the slurry conveying pipe fitting 21 is sleeved outside the control pipe fitting 22; the slurry inlet end 113 of the main body 11 is inserted into one end of the slurry conveying pipe fitting 21 and is sealed to the slurry conveying pipe fitting 21, and the other end of the slurry conveying pipe fitting 21 is connected to the slurry injection assembly; the control connector 15 extends into the slurry conveying pipe fitting 21, and one end of the control pipe fitting 22 is sealed to the control connector 15, and the other end is connected to the pressure control assembly.

[0054] The control connector 15 is located at the grout inlet end 113, and the corresponding control pipe 22 can be installed inside the grout delivery pipe 21. This creates conditions for the main body 11 and the matching pipe to have the same pipe diameter, facilitating grouting operations. Simultaneously, the delivery pipe assembly and the blowout preventer (BOP) installed on the guide pipe of the tunnel boring machine (TBM) can cooperate more closely, preventing external impurities from entering the TBM through the gap between the delivery pipe assembly and the BOP, thus affecting the normal operation of the TBM. Furthermore, placing the control pipe 22 inside the grout delivery pipe 21 is more conducive to the forward and backward movement of the delivery pipe assembly within the BOP. Especially when the delivery pipe assembly rotates forward and backward with external power assistance, the resistance exerted by the BOP on the delivery pipe assembly is significantly less than in existing technologies.

[0055] Furthermore, such as Figure 4 As shown, a check valve 16 is connected to the grout outlet 111 of the main body 11. By setting the check valve 16, the grout that has entered the grouting hole during the grouting process can be prevented from flowing back into the grouting plug 1. At the same time, during the process of waiting for the grout to solidify after the grouting is completed, water can be introduced into the grout delivery pipe 21 and the grouting plug 1 in advance for cleaning, which effectively prevents the grout from solidifying in the grout delivery pipe 21 and the grouting plug 1.

[0056] Furthermore, such as Figure 4 As shown, the transition pipe 14 is made of rigid material, and the control connector 15 is coaxially arranged with the main body 11. There are at least two transition pipes 14, and they are evenly distributed in a ring around the axis of the main body 11.

[0057] Furthermore, such as Figure 7 and Figure 8As shown, the adjusting pipe fitting 315 is provided with two axial limiting units 316, and the adjusting pipe fitting 315 can move relative to the adjusting channel between the two axial limiting units 316. Specifically, the limiting unit 316 is a retaining ring, and the limiting is achieved by the retaining ring contacting the adapter unit 312.

[0058] Furthermore, the adjusting pipe fitting is circumferentially rotatable relative to the adjusting channel, allowing for better adaptation to and control of the rotating connection operation of the pipe fitting.

[0059] Since the slurry conveying pipe 21 and the control pipe 22 are set independently, the lengths of the slurry conveying pipe 21 and the control pipe 22 are often inconsistent during actual use, which has a significant impact on the installation and use at the construction site.

[0060] This application compensates for the length error between the slurry conveying pipe 21 and the control pipe 22 by adjusting the axial movement of the pipe 315 relative to the adjustment channel, while ensuring that the slurry conveying pipe 21 and the control pipe 22 work independently and stably. The adjustment operation is simple and has great practical value.

[0061] Furthermore, such as Figure 5 and Figure 6 As shown, the power module 3 also includes a propulsion assembly 32, which includes a propulsion trolley and a rotary drive. The adapter assembly 31 is mounted on the propulsion trolley, and the rotary drive drives the adapter assembly 31 and the slurry conveying pipe 21 to rotate around the axis.

[0062] like Figure 5 and Figure 6 The adapter unit 312 shown includes a rotary connecting portion 317. The first connector includes a rotary distributing unit 314, which is sleeved on the rotary connecting portion 317 and is fixedly arranged in the circumferential direction relative to the propulsion trolley.

[0063] like Figure 5 and Figure 6 The rotary distribution unit 314 and the rotary connection part 317 are axially sealed, and an intermediate cavity is formed between the rotary distribution unit 314 and the rotary connection part 317. The intermediate cavity is simultaneously connected to the first distribution cavity 311 and the slurry injection assembly.

[0064] like Figure 4 As shown, a drill bit 17 is connected to the end of the main body 11 away from the slurry inlet end 113.

[0065] The adapter component 31 can rotate and move axially under the drive of the propulsion component 32. In conjunction with the drill bit 17, it can perform drilling operations on the basis of grouting function, realize integrated drilling and grouting construction, greatly improve construction efficiency, and is especially suitable for construction operations in softer rock and soil 4.

[0066] A construction process for pre-grouting during tunnel boring machine excavation, employing the grouting equipment described above;

[0067] At least the following steps are included:

[0068] Step 1: Drilling: The propulsion component 32 operates, and the drill bit 17 and the delivery pipe assembly 2 rotate and drill to the preset depth to form a basic hole;

[0069] Feeding: The grouting plug and delivery pipe assembly are fed into the preset position in the foundation hole to be grouted using external power;

[0070] Step 2: Tightening: The pressure control component pressurizes the tightening cavity through the control fittings, causing the tightening unit to expand outward and tighten within the base hole;

[0071] Step 3 Grouting: The grout injection assembly delivers grout into the foundation hole through the grout delivery pipe and the main body until the grout in the foundation hole reaches the preset pressure value, at which point the grout injection assembly stops working;

[0072] Step 4: Position Adjustment: The pressure control component releases pressure into the expansion chamber via the control fittings, causing the expansion unit to contract; the drill bit and delivery pipe assembly retract a preset distance; repeat steps 2 to 4 until the grouting plug exits the foundation hole, completing the grouting process.

[0073] In summary, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A grouting device, characterized in that, At least including: The grouting plug includes a main body, one end of which is a grout inlet end; the main body is provided with a grout flow channel, and the grout inlet of the grout flow channel is located at the grout inlet end of the main body; it also includes an expansion unit located on the outside of the main body, the expansion unit being provided with an expansion cavity; and it also includes a control connector located at the grout inlet end, the control connector being connected to the expansion cavity. A conveying pipe assembly, comprising slurry conveying pipe fittings and control pipe fittings, wherein the slurry conveying pipe fittings are made of rigid materials; The power module includes a pressure control component and a slurry injection component; In the working state, the slurry conveying pipe fitting is sleeved outside the control pipe fitting; the slurry inlet end of the main body is inserted into one end of the slurry conveying pipe fitting and is sealed to the slurry conveying pipe fitting, and the other end of the slurry conveying pipe fitting is connected to the slurry injection assembly; the control connector extends into the slurry conveying pipe fitting, and one end of the control pipe fitting is sealed to the control connector, and the other end is connected to the pressure control assembly. The outer side of the main body is provided with a groove; the expansion unit includes an expansion sleeve made of elastic material, which is sleeved on the outer side of the main body and covers the groove; the expansion sleeve is sealed to the main body and together with the groove forms an expansion cavity; The power module also includes a conversion assembly, which includes a conversion unit. The conversion unit is provided with a first connector and a second connector. The conversion unit is also provided with a first distribution cavity and a second distribution cavity. The first connector is simultaneously connected to the slurry injection assembly and the first distribution cavity, and the second connector is simultaneously connected to the pressure control assembly and the second distribution cavity. An adjustment channel is provided between the first distribution cavity and the second distribution cavity; the adapter assembly further includes an adjustment pipe that passes through the adjustment channel and can move axially relative to the adjustment channel; the adjustment pipe and the adjustment channel are axially sealed. The transfer unit is also provided with a slurry output interface, which is connected to the first distribution cavity. In the working state, the slurry output interface is sealed to the slurry conveying pipe, one end of the adjusting pipe is sealed to the control pipe, and the other end is freely disposed in the second distribution cavity.

2. The grouting equipment according to claim 1, characterized in that: The slurry conveying pipe fitting includes at least one conveying section, and two adjacent conveying sections are detachably connected. The control fitting includes at least two control sections, each of which includes a tube body made of flexible material and connecting portions located at both ends of the tube body. Adjacent control sections are detachably connected by the connecting portions.

3. The grouting equipment according to claim 1, characterized in that: The regulating pipe is provided with two axial limiting units, and the regulating pipe can move relative to the regulating channel between the two axial limiting units.

4. The grouting equipment according to claim 1, characterized in that: The power module also includes a propulsion assembly, which includes a propulsion trolley and a rotary drive. The adapter is mounted on the propulsion trolley, and the rotary drive drives the adapter and the slurry conveying pipe to rotate around an axis.

5. The grouting equipment according to claim 4, characterized in that: The adapter unit includes a rotary connecting part; the first connector includes a rotary distributing unit, which is sleeved outside the rotary connecting part and is fixedly arranged in the circumferential direction relative to the push trolley. The rotary distribution unit and the rotary connection part are axially sealed, and an intermediate cavity is formed between the rotary distribution unit and the rotary connection part. The intermediate cavity is simultaneously connected to the first distribution cavity and the slurry injection assembly.

6. The grouting equipment according to any one of claims 3-5, characterized in that: A drill bit is connected to the end of the main body away from the slurry inlet.

7. A construction process for pre-grouting during tunnel boring machine (TBM) excavation, characterized in that: The grouting equipment as described in any one of claims 1-6 is used; At least the following steps are included: Step 1 Feeding: Use external power to send the grouting plug and delivery pipe assembly into the preset position in the foundation hole to be grouted; Step 2: Tightening: The pressure control component pressurizes the tightening cavity through the control fittings, causing the tightening unit to expand outward and tighten within the base hole; Step 3 Grouting: The grout injection assembly delivers grout into the foundation hole through the grout delivery pipe and the main body until the grout in the foundation hole reaches the preset pressure value, at which point the grout injection assembly stops working; Step 4: Position Adjustment: The pressure control component releases pressure to the expansion chamber through the control fittings, causing the expansion unit to contract; the drill bit and delivery pipe assembly retract a preset distance; repeat steps 2 to 4 until the grouting plug exits the foundation hole, completing the grouting construction process.

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