Common orifice device and construction method for drilling holes using the MJS and freezing methods in connecting channels

Abstract

The present invention discloses a common orifice device and construction method for drilling holes using the MJS construction method and the freezing construction method for a connecting channel. The common orifice device for drilling holes using the MJS construction method and the freezing construction method for a connecting channel includes an MJS construction orifice pipe, the first end of which is inserted into a tunnel segment and fixedly connected to the tunnel segment, and the inner diameter of the MJS construction orifice pipe matches the diameter of the MJS drill rod; a flange is fixedly connected to the second end of the MJS construction orifice pipe, and the flange on the second end of the MJS construction orifice pipe is detachably fixedly connected to a guard plate via bolts, and the freezing construction orifice pipe is fixedly connected to the guard plate. The first end of the freezing construction orifice pipe is coaxially inserted into the MJS construction orifice pipe, and the inner diameter of the freezing construction orifice pipe matches the diameter of the freezing drill rod. By installing the guard plate and the freezing construction orifice pipe on the MJS construction orifice pipe, the MJS construction method drilling hole position is utilized when drilling the freezing hole, which can effectively reduce the number of holes opened in the tunnel segment.

Description

Technical Field

[0001] The present invention relates to the technical field of connecting channel construction, in particular to a common orifice device and construction method for connecting channel drilling using an MJS construction method and a freezing construction method. Background Art

[0002] The number of ultra-large diameter shield tunnel projects in my country (shield tunnels with diameters of 14 meters or greater, capable of meeting traffic needs with two-deck, four-lane lanes or single-deck, three-lane lanes) is increasing year by year. Connecting tunnels, constructed between ultra-large diameter twin tunnels for purposes such as connectivity, drainage, emergency evacuation, and fire prevention, are a crucial component of tunnel engineering.

[0003] Currently, the vast majority of connecting tunnels in my country are still constructed using underground excavation using the mining method. In ultra-large-diameter tunnel projects in water-rich strata, the intersection between the tunnel and the connecting tunnel, as well as the surrounding strata, is disturbed by construction, resulting in complex stress conditions. This creates significant risks associated with underground excavation of connecting tunnels. Some tunnels are buried deep and located in water-rich sand layers, creating the potential for construction accidents such as water and sand gushing. To improve construction safety, MJS reinforcement and artificial freezing methods are used to preemptively reinforce the strata. MJS construction improves the stratum to reduce its permeability, while artificial freezing effectively slows frost heave. Excavation and construction can then proceed under the protection of the MJS cement frozen soil.

[0004] The construction relationship between MJS reinforcement holes and freezing holes will affect construction safety. Since MJS construction and freezing construction use two different sets of equipment, if the freezing construction cannot utilize the hole positions of the MJS reinforcement holes, it may cause a large displacement of the freezing holes. Affected by the cement slurry reinforcement layer, it will make it difficult for the freezing wall to be connected. At the same time, multiple openings will cause excessive damage to the tunnel segments, resulting in a reduction in the strength of the tunnel segments. Summary of the Invention

[0005] To this end, the technical problem to be solved by the present invention is to provide a shared hole position for MJS drilling and freezing drilling, avoid mutual interference between MJS drilling and freezing drilling, and realize a safe drilling communication channel, a shared orifice device and a construction method for MJS drilling and freezing drilling.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a common orifice device for drilling holes by the MJS method and the freezing method of the connecting channel, including an MJS construction orifice pipe, the first end of the MJS construction orifice pipe is inserted into the tunnel segment and fixedly connected to the tunnel segment, and the inner diameter of the MJS construction orifice pipe matches the diameter of the MJS drill rod; a flange is fixedly connected to the second end of the MJS construction orifice pipe, and the flange on the second end of the MJS construction orifice pipe is detachably fixedly connected to a guard plate by bolts, and a freezing construction orifice pipe is fixedly connected to the guard plate, and the first end of the freezing construction orifice pipe is coaxially inserted into the MJS construction orifice pipe, and the inner diameter of the freezing construction orifice pipe matches the diameter of the freezing drill rod.

[0007] The above-mentioned connecting channel MJS method and freezing method drilling use a common orifice device. The MJS construction orifice pipe is welded with an arc-shaped steel plate with the same curvature as the tunnel segment. The four corners of the arc-shaped steel plate are fixedly connected to the tunnel segment by bolts.

[0008] The MJS method and the freezing method for drilling the connecting channel share a common orifice device, and a rubber pad is provided between the arc-shaped steel plate and the tunnel segment.

[0009] The MJS construction method and the freezing construction method drilling of the above-mentioned communication channel share the same orifice device, and the MJS construction orifice pipe is connected to a bypass ball valve.

[0010] The above-mentioned connecting channel MJS method and freezing method drilling use a common orifice device. When performing MJS construction: remove the guard plate, and fix the first ball valve, the first pressure relief module and the first packing device in sequence on the second end of the MJS construction orifice pipe. The inner diameters of the first ball valve, the first pressure relief module and the first packing device match the diameter of the MJS drill pipe. The MJS drill pipe passes through the first packing device, the first pressure relief module, the first ball valve and the MJS construction orifice pipe in sequence and drills into the formation.

[0011] The above-mentioned communication channel MJS construction method and freezing construction method drilling use a common orifice device. During freezing construction, a plug is sealed inside the second end of the freezing construction orifice pipe, and cement slurry is injected into the MJS construction orifice pipe.

[0012] The above-mentioned connecting channel MJS method and the freezing method drilling method share the orifice device. When performing freezing construction: the second pressure relief module, the second ball valve and the second packing device are fixedly connected in sequence on the second end of the freezing construction orifice pipe. The inner diameters of the second pressure relief module, the second ball valve and the second packing device match the inner diameter of the freezing drill rod. The freezing drill rod passes through the second packing device, the second ball valve, the second pressure relief module and the freezing construction orifice pipe in sequence and then drills into the formation.

[0013] The construction method for the hole sharing between the MJS construction method and the freezing construction method for the connecting channel is carried out using the hole sharing device for the MJS construction method and the freezing construction method for the connecting channel, and includes the following steps:

[0014] Step A: Use a water drill to drill connection holes at the measured MJS pile positions on the tunnel segments, and fix the curved steel plates on the tunnel segments so that the circular holes on the curved steel plates are concentric with the connection holes on the tunnel segments.

[0015] Step B: Insert the MJS construction port pipe through the curved steel plate into the connection hole on the tunnel segment;

[0016] Step C: sequentially sleeve the first packing device, the first pressure relief module, and the first ball valve onto the MJS drill pipe, and keep the MJS construction orifice pipe, the first ball valve, the first pressure relief module, the first packing device, and the MJS drill pipe concentric by moving the MJS drill pipe; weld the MJS construction orifice pipe to the curved steel plate, then fix the first ball valve to the flange at the second end of the MJS construction orifice pipe, and sequentially connect the first pressure relief module and the first packing device with bolts, and finally withdraw the MJS drill pipe;

[0017] Step D: After verifying the coaxiality of the MJS construction orifice pipe and the first ball valve, the first pressure relief module, and the first packing device, the MJS construction is carried out; after the MJS construction is completed, the first packing device, the first pressure relief module, and the first ball valve are removed in sequence;

[0018] Step E: Fix the guard plate to the flange at the second end of the MJS construction orifice pipe by bolts, weld the frozen construction orifice pipe into the center hole of the guard plate, coaxially insert the frozen construction orifice pipe into the MJS construction orifice pipe, and install a plug into the frozen construction orifice pipe;

[0019] Step F: injecting cement slurry into the MJS construction orifice pipe through the bypass ball valve on the MJS construction orifice pipe, and after the cement slurry solidifies, connecting the second pressure relief module, the second ball valve, and the second packing device to the second end of the frozen construction orifice pipe in sequence through bolts;

[0020] Step G: The frozen drill pipe passes through the second packing device, the second ball valve, the second pressure relief module and the solidified cement slurry in sequence and then drills into the formation.

[0021] The above-mentioned connecting channel MJS method and freezing method drilling method share the same orifice construction method. In step A, the depth of the connecting hole on the tunnel segment is 40 cm and the hole diameter is 230 mm. The diameter of the circular hole on the curved steel plate is 230 mm. A rubber water-stop pad is installed between the tunnel segment and the curved steel plate. In step B, the outer diameter of the MJS construction orifice pipe is 220 mm and the inner diameter is 198 mm.

[0022] The above-mentioned connecting channel MJS method and freezing method drilling share the same orifice construction method. In step E, the thickness of the guard plate is 10 mm, and the outer diameter of the guard plate is equal to the outer diameter of the flange on the second end of the MJS construction orifice pipe. The freezing construction orifice pipe is provided with an internal thread, and the plug is threadedly connected to the freezing construction orifice pipe, and the plug is a plastic plug.

[0023] The technical solution of the present invention achieves the following beneficial technical effects:

[0024] By installing a guard plate and a freezing construction hole pipe on the MJS construction hole pipe, and utilizing the MJS method to drill the hole position when drilling the freezing hole, the number of holes opened in the tunnel segments can be effectively reduced, the damage to the tunnel segments can be reduced, the disturbance to the soil layer can be reduced, the occurrence of water gushing can be reduced, and the difficulty of drilling the freezing hole construction can be reduced.

[0025] Since cement slurry has been injected into the soil layer by the MJS method, if freezing holes are opened around the holes drilled by the MJS method, the cement reinforcement layer of the MJS method may be damaged. In addition, due to the obstruction of the cement reinforcement layer, the freezing wall may not be able to be connected, and the reinforcement strength of the soil layer may be insufficient. The present invention performs freezing hole drilling and freezing construction on the basis of the original hole positions drilled by the MJS method, and does not cause interference between the MJS drilling hole positions and the freezing pipe positions, thereby ensuring the strength of the cement reinforcement layer and enabling the freezing wall to be connected smoothly. The freezing wall is reinforced for a second time on the basis of the cement reinforcement layer, thereby improving the reinforcement effect on the soil layer and greatly improving the safety of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the MJS construction of the present invention;

[0027] Figure 2 Schematic diagram of installing a guard plate on an MJS construction orifice pipe and freezing the construction orifice pipe according to the present invention;

[0028] Figure 3 Schematic diagram of the MJS construction orifice pipe after cement slurry is injected into the present invention;

[0029] Figure 4 Schematic diagram of freezing construction according to the present invention.

[0030] The reference numerals in the figure are as follows: 1-tunnel segment; 2-arc steel plate; 3-MJS construction orifice pipe; 4-bypass ball valve; 5-protective plate; 6-frozen construction orifice pipe; 7-plug; 8-cement slurry; 9-first ball valve; 10-first pressure relief module; 11-first packing device; 12-MJS drill pipe; 13-second pressure relief module; 14-second ball valve; 15-second packing device; 16-frozen drill pipe; 17-formation. DETAILED DESCRIPTION

[0031] Example 1

[0032] The communication channel MJS method and the freezing method drilling method share the same orifice device in this embodiment. Figure 1-2 As shown, it includes an MJS construction orifice pipe 3, the first end of which is inserted into the tunnel segment 1 and fixedly connected to the tunnel segment 1, the MJS construction orifice pipe 3 is connected to a bypass ball valve 4, and the inner diameter of the MJS construction orifice pipe 3 matches the diameter of the MJS drill rod 12; a flange is fixedly connected to the second end of the MJS construction orifice pipe 3, and the flange on the second end of the MJS construction orifice pipe 3 is detachably fixedly connected to a guard plate 5 by bolts, and a freezing construction orifice pipe 6 is fixedly connected to the guard plate 5, and the first end of the freezing construction orifice pipe 6 is coaxially inserted into the MJS construction orifice pipe 3, and the inner diameter of the freezing construction orifice pipe 6 matches the diameter of the freezing drill rod 16.

[0033] like Figure 1 As shown, the MJS construction orifice pipe 3 is welded with an arc-shaped steel plate 2 with the same curvature as the tunnel segment 1. One circle of the arc-shaped steel plate 2 is fixedly connected to the tunnel segment 1 by 6 M20 chemical bolts implanted in the tunnel segment 1, and the implantation depth is not less than 20 cm. A rubber pad is arranged between the arc-shaped steel plate 2 and the tunnel segment 1. After the chemical bolt nut is tightened, the arc-shaped steel plate 2 is squeezed to compress the rubber pad, thereby playing a role of sealing and water-stopping.

[0034] like Figure 1 As shown, when carrying out MJS construction: the guard plate 5 is removed, and the first ball valve 9, the first pressure relief module 10 and the first packing device 11 are fixedly connected in sequence to the second end of the MJS construction orifice pipe 3. The inner diameters of the first ball valve 9, the first pressure relief module 10 and the first packing device 11 match the diameter of the MJS drill rod 12. The MJS drill rod 12 passes through the first packing device 11, the first pressure relief module 10, the first ball valve 9 and the MJS construction orifice pipe 3 in sequence and drills into the formation 17.

[0035] like Figure 2-4As shown, during freezing construction: a plug 7 is sealed and connected to the second end of the freezing construction orifice pipe 6, and cement slurry 8 is injected into the MJS construction orifice pipe 3. After the cement slurry 8 solidifies, the second pressure relief module 13, the second ball valve 14 and the second packing device 15 are fixedly connected to the second end of the freezing construction orifice pipe 6 in sequence. The inner diameters of the second pressure relief module 13, the second ball valve 14 and the second packing device 15 match the inner diameter of the freezing drill rod 16. The freezing drill rod 16 passes through the second packing device 15, the second ball valve 14, the second pressure relief module 13 and the freezing construction orifice pipe 6 in sequence and then drills into the formation 17. The second packing device 15 uses high-wear-resistant extruded packing with a packing length of 4000 mm and a sealing length of 240 mm after winding, which can meet the wear requirements of drilling construction above 20 m. After all the installation is completed, the freezing drill rod 16 is extended into the freezing construction hole pipe 6, and the drilling construction can be started. When drilling, the drill bit first drills through the plastic plug 7 and the cement part, and then continues drilling without changing the drill bit, so that the freezing drilling is zero-risk.

[0036] Example 2

[0037] The construction method for the communication channel MJS method and the freezing method drilling hole sharing the same orifice in this embodiment is constructed using the communication channel MJS method and the freezing method drilling hole sharing orifice device in Example 1, and includes the following steps:

[0038] Step A: Use a water drill to drill connection holes at the measured MJS pile positions on the tunnel segment 1. The connection holes are 40 cm deep and 230 mm in diameter. The curved steel plate 2 is fixed to the tunnel segment 1. The curved steel plate 2 is connected to the tunnel segment 1 using chemical bolts implanted in the tunnel segment 1. The circular hole on the curved steel plate 2 is concentric with the connection hole on the tunnel segment 1. The diameter of the circular hole on the curved steel plate 2 is 230 mm. A rubber waterstop pad is installed between the tunnel segment 1 and the curved steel plate 2.

[0039] Step B: Insert the MJS construction orifice pipe 3 through the curved steel plate 2 into the connection hole on the tunnel segment 1. The outer diameter of the MJS construction orifice pipe 3 is 220 mm and the inner diameter is 198 mm.

[0040] Step C: The first packing device 11, the first pressure relief module 10 and the first ball valve 9 are sequentially mounted on the MJS drill rod 12, and the MJS construction orifice pipe 3, the first ball valve 9, the first pressure relief module 10, the first packing device 11 and the MJS drill rod 12 are kept concentric by moving the MJS drill rod 12. Since the circular hole on the curved steel plate 2 is larger than the outer diameter of the MJS construction orifice pipe 3, the MJS construction orifice pipe 3 can be easily fine-tuned to ensure coaxiality; the MJS construction orifice pipe 3 is welded to the curved steel plate 2, and then the first ball valve 9 is fixedly connected to the flange at the second end of the MJS construction orifice pipe 3, and the first pressure relief module 10 and the first packing device 11 are sequentially connected by bolts, and finally the MJS drill rod 12 is withdrawn;

[0041] Step D: After checking the coaxiality of the MJS construction orifice pipe 3 and the first ball valve 9, the first pressure relief module 10 and the first packing device 11, the MJS construction is carried out; after the MJS construction is completed, the first packing device 11, the first pressure relief module 10 and the first ball valve 9 are removed in sequence;

[0042] Step E: Fixing a guard plate 5 on the flange at the second end of the MJS construction orifice pipe 3 by bolts, wherein the thickness of the guard plate 5 is 10 mm, and the outer diameter of the guard plate 5 is equal to the outer diameter of the flange on the second end of the MJS construction orifice pipe 3, welding a freezing construction orifice pipe 6 into the center hole of the guard plate 5, and coaxially inserting the freezing construction orifice pipe 6 into the MJS construction orifice pipe 3, and installing a plug 7 into the freezing construction orifice pipe 6, wherein the freezing construction orifice pipe 6 is provided with an internal thread, and the plug 7 is threadedly connected to the freezing construction orifice pipe 6, and the plug 7 is a plastic plug;

[0043] Step F: Inject cement slurry 8 into the MJS construction orifice pipe 3 through the bypass ball valve 4 on the MJS construction orifice pipe 3. After the cement slurry 8 solidifies, connect the second pressure relief module 13, the second ball valve 14, and the second packing device 15 to the second end of the frozen construction orifice pipe 6 in sequence through bolts;

[0044] Step G: The freezing drill rod 16 passes through the second packing device 15, the second ball valve 14, the second pressure relief module 13 and the solidified cement slurry 8 in sequence and then drills into the stratum 17 to complete the construction of the freezing hole.

[0045] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the claims of this patent application.

Claims

1. The construction method of using the same orifice for the MJS construction method and the freezing construction method for the connecting channel is characterized by: The construction is carried out by using the common orifice device of the connecting channel MJS method and the freezing method drilling. The common orifice device for drilling holes using the MJS construction method and the freezing construction method for the connecting channel comprises an MJS construction orifice pipe (3), the first end of the MJS construction orifice pipe (3) being inserted into the tunnel segment (1) and fixedly connected to the tunnel segment (1), the inner diameter of the MJS construction orifice pipe (3) matching the diameter of the MJS drill rod (12); a flange being fixedly connected to the second end of the MJS construction orifice pipe (3), the flange on the second end of the MJS construction orifice pipe (3) being detachably fixedly connected to a guard plate (5) by bolts, the guard plate (5) being fixedly connected to a freezing construction orifice pipe (6), the first end of the freezing construction orifice pipe (6) being coaxially inserted into the MJS construction orifice pipe (3), the inner diameter of the freezing construction orifice pipe (6) matching the diameter of the freezing drill rod (16); The construction method includes the following steps: Step A: Drill a connection hole at the MJS pile position measured on the tunnel segment (1) using a water drill, and fix the arc-shaped steel plate (2) on the tunnel segment (1) so that the circular hole on the arc-shaped steel plate (2) is concentric with the connection hole on the tunnel segment (1); Step B: inserting the MJS construction port pipe (3) through the curved steel plate (2) into the connection hole on the tunnel segment (1); Step C: The first packing device (11), the first pressure relief module (10) and the first ball valve (9) are sequentially mounted on the MJS drill pipe (12), and the MJS construction orifice pipe (3), the first ball valve (9), the first pressure relief module (10), the first packing device (11) and the MJS drill pipe (12) are kept concentric by moving the MJS drill pipe (12); the MJS construction orifice pipe (3) is welded to the arc-shaped steel plate (2), and then the first ball valve (9) is fixedly connected to the flange at the second end of the MJS construction orifice pipe (3), and the first pressure relief module (10) and the first packing device (11) are sequentially connected by bolts, and finally the MJS drill pipe (12) is withdrawn; Step D: After checking the coaxiality of the MJS construction orifice pipe (3) and the first ball valve (9), the first pressure relief module (10) and the first packing device (11), the MJS construction is carried out; after the MJS construction is completed, the first packing device (11), the first pressure relief module (10) and the first ball valve (9) are removed in sequence; Step E: a protective plate (5) is fixedly connected to the flange at the second end of the MJS construction orifice pipe (3) by bolts, a freezing construction orifice pipe (6) is welded in the center hole of the protective plate (5), and the freezing construction orifice pipe (6) is coaxially inserted into the MJS construction orifice pipe (3), and a plug (7) is installed in the freezing construction orifice pipe (6); the thickness of the protective plate (5) is 10 mm, the outer diameter of the protective plate (5) is equal to the outer diameter of the flange at the second end of the MJS construction orifice pipe (3), an internal thread is provided in the freezing construction orifice pipe (6), and the plug (7) is threadedly connected to the freezing construction orifice pipe (6), and the plug (7) is a plastic plug; Step F: injecting cement slurry (8) into the MJS construction orifice pipe (3) through the bypass ball valve (4) on the MJS construction orifice pipe (3); after the cement slurry (8) solidifies, connecting the second pressure relief module (13), the second ball valve (14) and the second packing device (15) to the second end of the frozen construction orifice pipe (6) in sequence through bolts; Step G: The frozen drill rod (16) passes through the second packing device (15), the second ball valve (14), the second pressure relief module (13) and the solidified cement slurry (8) in sequence and then is drilled into the formation (17).

2. The construction method for a connecting channel using the MJS method and the freezing method for drilling a hole with a common opening according to claim 1 is characterized in that: In step A, the depth of the connection hole on the tunnel segment (1) is 40 cm and the hole diameter is 230 mm, the hole diameter of the circular hole on the curved steel plate (2) is 230 mm, and a rubber water-stop pad is installed between the tunnel segment (1) and the curved steel plate (2); in step B, the outer diameter of the MJS construction orifice pipe (3) is 220 mm and the inner diameter is 198 mm.

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