Hole opening device shared by MJS construction method and freezing construction method drilling of connecting channel and construction method

Abstract

The invention discloses a connecting channel MJS construction method and freezing construction method drilling shared orifice device and a construction method.The connecting channel MJS construction method and freezing construction method drilling shared orifice device comprises an MJS construction orifice pipe, the first end of the MJS construction orifice pipe is inserted into a tunnel segment and fixedly connected with the tunnel segment, and the inner diameter of the MJS construction orifice pipe is matched with the diameter of an MJS drill rod; the end portion of the second end of the MJS construction orifice pipe is fixedly connected with a flange, the flange at the second end of the MJS construction orifice pipe is detachably and fixedly connected with a protection plate through a bolt, the protection plate is fixedly connected with a freezing construction orifice pipe, and the first end of the freezing construction orifice pipe is coaxially inserted into the MJS construction orifice pipe. The inner diameter of the freezing construction orifice pipe is matched with the diameter of the freezing drill rod. The protection plate and the freezing construction orifice pipe are installed on the MJS construction orifice pipe, when a freezing hole is drilled, the hole site is drilled through the MJS construction method, and the number of holes formed in a tunnel segment can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of communication channel construction, and more specifically to a common orifice device and construction method for drilling holes using an MJS construction method and a freezing construction method for a communication channel. Background Art

[0002] At present, the number of super-large diameter shield tunnel projects in my country (shield tunnels with a diameter of 14m or above can meet the traffic needs of double-layer 4-lane or single-layer 3-lane) is increasing year by year. The connecting channel is a channel built between super-large diameter double-line tunnels for the purpose of connection, drainage, emergency evacuation, fire prevention, etc., and is an important part of the tunnel project.

[0003] At present, most of the communication channels in my country are still excavated by mining methods. In the super-large diameter tunnel project in water-rich strata, the intersection structure of the tunnel and the communication channel and the surrounding strata are disturbed by construction, and the stress state is complex. The risk of excavating the communication channel is relatively high. Some channels are buried deep and are in water-rich sand layers. If you are not careful, it will cause accidents in the construction of the communication channel such as water and sand gushing. In order to improve the safety of construction, the MJS reinforcement and artificial freezing methods are used to reinforce the stratum in advance. The MJS construction improves the stratum to reduce the stratum permeability coefficient. The artificial freezing process will also effectively slow down the frost heave of the stratum, and then excavation and construction are carried out under the protection of 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 use 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 be difficult for the freezing wall to be connected. At the same time, multiple openings will cause excessive damage to the tunnel segments, resulting in reduced 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 MJS method and freezing method drilling shared hole mouth device and construction method.

[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 a connecting channel, comprising an MJS construction orifice pipe, a first end of the MJS construction orifice pipe is inserted into a tunnel segment and fixedly connected to the tunnel segment, and an inner diameter of the MJS construction orifice pipe matches the diameter of an MJS drill rod; a flange is fixedly connected to the second end of the MJS construction orifice pipe, the flange on the second end of the MJS construction orifice pipe is detachably fixedly connected to a guard plate by bolts, a 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.

[0007] The MJS method and the freezing method drilling method of the above-mentioned communication channel share the same 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 above-mentioned communication channel share a common orifice device, and a rubber pad is arranged between the arc-shaped steel plate and the tunnel segment.

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

[0010] The above-mentioned communication 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 MJS construction method and the freezing construction method of the above-mentioned communication channel share the same orifice device. When the freezing construction is carried out: a plug is sealed and connected 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 communication channel MJS method and the freezing method drilling use a common orifice device. When performing freezing construction: a second pressure relief module, a second ball valve, and a second packing device are fixedly connected in sequence on the second end of the freezing construction orifice pipe, and 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 of the common orifice of the MJS construction method and the freezing construction method for the communication channel drilling is carried out by using the common orifice device of the MJS construction method and the freezing construction method for the communication channel drilling, and includes the following steps:

[0014] Step A: Drill connection holes at the MJS pile positions measured on the tunnel segments using a water drill, fix the arc-shaped steel plate on the tunnel segments, and make the circular holes on the arc-shaped steel plate 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 on 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 and the arc steel plate together, 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 by bolts, and finally withdraw the MJS drill pipe;

[0017] Step D: After checking 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 performed; 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 connecting guard plate on the flange at the second end of the MJS construction orifice pipe by bolts, weld the frozen construction orifice pipe in the center hole of the guard plate, and coaxially insert the frozen construction orifice pipe into the MJS construction orifice pipe, and install a plug in the frozen construction orifice pipe;

[0019] Step F: inject 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, connect 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 shared the same orifice construction method. In step A, the depth of the connecting hole on the tunnel segment is 40cm and the hole diameter is 230mm, the diameter of the circular hole on the arc-shaped steel plate is 230mm, and a rubber water-stop pad is installed between the tunnel segment and the arc-shaped steel plate; in step B, the outer diameter of the MJS construction orifice pipe is 220mm and the inner diameter is 198mm.

[0022] The above-mentioned connecting channel MJS method and freezing method drilling common orifice construction method, in step E, the thickness of the guard plate is 10mm, 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, the plug is threadedly connected in 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 mouth pipe on the MJS construction hole mouth pipe, and utilizing the MJS method for drilling holes when drilling freezing holes, 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 freezing hole construction drilling can be reduced.

[0025] Since cement slurry has been injected into the soil layer in the MJS method, if freezing holes are opened around the holes drilled in the MJS method, the cement reinforcement layer of the MJS method may be damaged, and the frozen wall may not be able to be interlocked due to the obstruction of the cement reinforcement layer, 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 holes drilled in the MJS method, and there will be no mutual interference between the holes drilled in the MJS method and the holes of the freezing pipes, thereby ensuring the strength of the cement reinforcement layer and enabling the frozen wall to be interlocked smoothly. The frozen wall is reinforced for the 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 the construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of MJS construction performed by 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 pipe;

[0029] Figure 4 The schematic diagram of the freezing construction of 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 in this embodiment share the same orifice device, such as 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 with 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, the flange on the second end of the MJS construction orifice pipe 3 is detachably fixedly connected to a guard plate 5 by bolts, a freezing construction orifice pipe 6 is fixedly connected to the guard plate 5, 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, a curved steel plate 2 with the same curvature as the tunnel segment 1 is welded on the MJS construction hole pipe 3. One circle of the curved 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 curved steel plate 2 and the tunnel segment 1. After the chemical bolt nut is tightened, the curved 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 performing 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 on 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, and 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 inside the second end of the freezing construction orifice pipe 6, cement slurry 8 is injected into the MJS construction orifice pipe 3, and after the cement slurry 8 solidifies, a second pressure relief module 13, a second ball valve 14 and a second packing device 15 are fixedly connected in sequence on the second end of the freezing construction orifice pipe 6, and 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, and 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, and the second packing device 15 uses highly 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 to drill. There is no need to replace the drill bit, so that the freezing drilling is risk-free.

[0036] Example 2

[0037] The construction method of the common orifice of the connecting channel MJS method and the freezing method drilling in this embodiment is constructed by using the common orifice device of the connecting channel MJS method and the freezing method drilling in Example 1, and includes the following steps:

[0038] Step A: Drill a connection hole at the MJS pile position measured on the tunnel segment 1 using a water drill, the depth of the connection hole is 40 cm and the diameter is 230 mm, fix the arc steel plate 2 on the tunnel segment 1, the arc steel plate 2 is connected by a chemical bolt implanted in the tunnel segment 1, the circular hole on the arc steel plate 2 is concentric with the connection hole on the tunnel segment 1, the diameter of the circular hole on the arc steel plate 2 is 230 mm, and a rubber water stop pad is installed between the tunnel segment 1 and the arc steel plate 2;

[0039] Step B: insert the MJS construction orifice pipe 3 through the arc 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 arc-shaped steel plate 2 is larger than the outer diameter of the MJS construction orifice pipe 3, the MJS construction orifice pipe 3 can be conveniently fine-tuned to ensure coaxiality; 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 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 performed; 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: A guard plate 5 is fixedly connected to the flange at the second end of the MJS construction orifice pipe 3 by bolts, 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 at the second end of the MJS construction orifice pipe 3, a frozen construction orifice pipe 6 is welded in the center hole of the guard plate 5, and the frozen construction orifice pipe 6 is coaxially inserted into the MJS construction orifice pipe 3, and a plug 7 is installed in the frozen construction orifice pipe 6, the frozen construction orifice pipe 6 is provided with an internal thread, the plug 7 is threadedly connected in the frozen 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, and 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 formation 17 to complete the construction of the freezing hole.

[0045] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. The MJS method and the freezing method of the communication channel use a common orifice device, which is characterized by: The invention comprises an MJS construction orifice pipe (3), wherein the first end of the MJS construction orifice pipe (3) is inserted into a tunnel segment (1) and fixedly connected to the tunnel segment (1), and the inner diameter of the MJS construction orifice pipe (3) matches the diameter of an MJS drill rod (12); a flange is fixedly connected to the second end of the MJS construction orifice pipe (3), and a guard plate (5) is detachably fixedly connected to the flange on the second end of the MJS construction orifice pipe (3) 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 a freezing drill rod (16).

2. The common orifice device for drilling holes by the MJS method and the freezing method of the communication channel according to claim 1 is characterized in that The MJS construction orifice pipe (3) is welded with an arc-shaped steel plate (2) having the same arc as the tunnel segment (1), and the four corners of the arc-shaped steel plate (2) are fixedly connected to the tunnel segment (1) by bolts.

3. The common orifice device for drilling holes by the MJS method and the freezing method of the communication channel according to claim 2 is characterized in that: A rubber pad is provided between the arc-shaped steel plate (2) and the tunnel segment (1).

4. The common orifice device for drilling holes by the MJS method and the freezing method of the communication channel according to claim 1 is characterized in that The MJS construction orifice pipe (3) is connected to a bypass ball valve (4).

5. The common orifice device for drilling holes by the MJS method and the freezing method of the communication channel according to any one of claims 1 to 4, characterized in that When performing MJS construction: the protective plate (5) is removed, and a first ball valve (9), a first pressure relief module (10) and a first packing device (11) are fixedly connected in sequence to the second end of the MJS construction orifice pipe (3), wherein 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 pipe (12), and the MJS drill pipe (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).

6. The common orifice device for drilling holes by the MJS method and the freezing method of the communication channel according to any one of claims 1 to 4, characterized in that When freezing construction is carried out: a plug (7) is sealed and connected inside the second end of the freezing construction orifice pipe (6), and cement slurry (8) is injected into the MJS construction orifice pipe (3).

7. The common orifice device for drilling holes by the MJS method and the freezing method of the communication channel according to claim 6 is characterized in that When freezing construction is carried out: a second pressure relief module (13), a second ball valve (14) and a second packing device (15) are fixedly connected in sequence to the second end of the freezing construction orifice pipe (6); 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).

8. The construction method of using the same orifice for drilling holes using the MJS method and the freezing method for the communication channel is characterized by: The construction is carried out using the common orifice device for drilling holes by the MJS construction method and the freezing construction method of the communication channel described in any one of claims 1 to 7, including the following steps: Step A: using a water drill to drill a connection hole at the MJS pile position measured on the tunnel segment (1), fixing 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 orifice pipe (3) through the curved steel plate (2) into the connection hole on the tunnel segment (1); Step C: sequentially sleeve the first packing device (11), the first pressure relief module (10) and the first ball valve (9) onto the MJS drill pipe (12), and keep 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) concentrically by moving the MJS drill pipe (12); weld the MJS construction orifice pipe (3) and the arc-shaped steel plate (2) together, then fix the first ball valve (9) to the flange at the second end of the MJS construction orifice pipe (3), and sequentially connect the first pressure relief module (10) and the first packing device (11) by bolts, and finally withdraw the MJS drill pipe (12); 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 performed; 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: fixing a guard plate (5) on the flange at the second end of the MJS construction orifice pipe (3) by bolts, welding a freezing construction orifice pipe (6) in 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) in the freezing construction orifice pipe (6); 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 drills into the formation (17).

9. The construction method for drilling a common hole by the MJS method and the freezing method for a communication channel according to claim 8 is characterized in that: In step A, the depth of the connection hole on the tunnel segment (1) is 40 cm and the diameter is 230 mm, the diameter of the circular hole on the arc-shaped steel plate (2) is 230 mm, and a rubber water-stop pad is installed between the tunnel segment (1) and the arc-shaped 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.

10. The construction method for drilling a common hole by the MJS method and the freezing method for a communication channel according to claim 8 is characterized in that: In step E, the thickness of the guard plate (5) is 10 mm, 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), the freezing construction orifice pipe (6) is provided with an internal thread, the plug (7) is threadedly connected in the freezing construction orifice pipe (6), and the plug (7) is a plastic plug.

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