Construction method for freeze method connection channels

Abstract

The present invention discloses a construction method for a connection passage by the freezing method, which comprises the following steps: Step 1: Install the main tunnel segment (1); Step 2: Drill the freezing pipes; Step 3: After the construction of the freezing pipes (2) is completed, stop the freezing method construction and seal the freezing holes. The present invention can improve the construction efficiency and quality of the connection passage of the underground tunnel by the freezing method and improve the appearance quality of the tunnel.

Description

Technical Field

[0001] The invention relates to a tunnel construction method, in particular to a construction method for connecting passages using a freezing method. Background Art

[0002] At present, the connecting passages between underground tunnels are mostly constructed using the "horizontal freezing method to reinforce the soil and the dark mining method to construct" technology. Generally, the connecting passages are constructed after the main tunnel is penetrated.

[0003] In the freezing connection channel of the prior art, the main process of freezing pipe drilling construction is: drilling holes on the pipe segments according to the designed position and angle of the freezing pipe, installing the orifice pipe, gate valve, orifice device, seals, packing and clamping device, freezing pipe drilling construction, using the bypass valve of the orifice pipe for compensation grouting, removing the sealing devices such as the gate valve, orifice device, sealing gasket, packing and clamping device, welding and sealing the annular space between the orifice pipe and the freezing pipe, retesting the freezing pipe, and pressure testing the freezing pipe for leakage. The drilling construction requires drilling holes on the tunnel segments to install the orifice pipe, and the orifice pipe also needs to be fixed to the segments with expansion screws or steel bars. The process is complicated and occupies a critical period of time. At the same time, the water-stopping effect of the orifice sealing device is poor.

[0004] In the prior art freezing connection channel, the main process of freezing hole sealing is generally: first, the hole pipe and the freezing pipe are cut to a certain depth in the pipe segment, then the freezing pipe is filled with mortar or concrete, the hole pipe is sealed by welding with steel plates, and two expansion bolts are installed on the side wall of the pipe segment in the cut area, and finally the mortar is smoothed. The freezing hole sealing process is complicated, the reliability is low, the sealing speed is slow, and the sealing hole is prone to leakage after the frozen reinforcement melts and sinks, and subsequent leakage plugging is difficult. Summary of the invention

[0005] The purpose of the present invention is to provide a construction method for freezing-connected passages, which can improve the construction efficiency and quality of freezing-connected passages in underground tunnels and improve the appearance quality of the tunnels.

[0006] The present invention is achieved in that:

[0007] A construction method for connecting a channel by freezing method comprises the following steps:

[0008] Step 1: Install the main tunnel segments;

[0009] The step 1 comprises the following sub-steps:

[0010] Step 1.1: Reserve freezing holes in the main tunnel segments and embed embedded pipes in the freezing holes;

[0011] Step 1.2: Screw and temporarily seal the embedded pipe through the blind end;

[0012] Step 2: Drilling construction of the freezing pipe;

[0013] The said Step 2 includes the following sub-steps:

[0014] Step 2.1: Remove the blind head and screw the orifice pipe onto the embedded pipe. The inner end of the orifice pipe is located inside the main tunnel segment, and the outer end of the orifice pipe extends into the tunnel interior;

[0015] Step 2.2: Connect the freezing pipe sealing device coaxially to the outer end of the orifice pipe;

[0016] Step 2.3: Insert the freezing pipe coaxially into the freezing pipe sealing device and the orifice pipe, so that the freezing pipe sealing device seals and wraps around the freezing pipe;

[0017] Step 2.4: Connect a grease bypass ball valve to the freezing pipe sealing device, so that the grease bypass ball valve injects grease and seals the freezing pipe;

[0018] Step 2.5: Carry out drilling construction on the freezing pipe and keep injecting grease during the drilling construction process;

[0019] Step 3: After the drilling construction of the freezing pipe is completed, stop the freezing method construction and seal the freezing holes;

[0020] The said Step 3 includes the following sub-steps:

[0021] Step 3.1: Drain the brine in the freezing pipe, remove the plugging plate and the orifice pipe;

[0022] Step 3.2: Cut off part of the freezing pipe so that one end of the cut freezing pipe is located inside the embedded pipe;

[0023] Step 3.3: Screw and seal the embedded pipe through the blind head;

[0024] Step 3.4: Inject sealing mortar between the blind head and the sealed embedded pipe and inside the freezing pipe;

[0025] Step 3.5: Use the sealing mortar to level the inner wall of the main tunnel segment.

[0026] When embedding the said embedded pipe, the axis of the embedded pipe is consistent with the designed insertion axis of the freezing pipe, and the embedded pipe is connected to the steel bar structure inside the main tunnel segment.

[0027] When embedding the said embedded pipe, a handhole box is embedded synchronously, and the handhole box is coaxially and fixedly connected to the end of the embedded pipe.

[0028] When temporarily sealing the embedded pipe through the said blind head, a filler is arranged between the blind head and the embedded pipe.

[0029] If there is filler filled between the plug and the embedded pipe, clean the filler synchronously when removing the plug.

[0030] Step 2.5 mentioned above includes the following sub-steps:

[0031] Step 2.5.1: Install a grouting bypass ball valve on the orifice pipe, and compensate and grout for reinforcement into the orifice pipe through the grouting bypass ball valve;

[0032] Step 5.2.5: Remove the freezing pipe sealing device, and seal the gap at the connection part between the outer end of the orifice pipe and the freezing pipe through a plugging plate.

[0033] The grouting bypass ball valve injects double-fluid cement slurry into the gap between the orifice pipe and the freezing pipe.

[0034] The plugging plate is of an annular structure. The outer ring edge of the plugging plate is welded and fixed to the outer end of the orifice pipe, and the inner ring of the plugging plate is welded and fixed to the outer wall of the freezing pipe.

[0035] When closing the embedded pipe through the plug mentioned above, if there is a manhole box embedded in the freezing hole, weld and reinforce the plug and the manhole box.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. Since the present invention is provided with an embedded pipe, the embedded pipe is directly embedded in the main tunnel segment according to the position of the freezing hole, with high installation reliability, without damaging the main reinforcement and other structures of the main tunnel segment, and can be screwed with a plug to temporarily seal the embedded pipe when the freezing method connection channel construction is not carried out, ensuring the construction of the main tunnel, and can be screwed with the orifice pipe for installing the freezing pipe and grouting for reinforcement, with convenient disassembly and assembly, greatly improving the construction efficiency of the freezing method connection channel.

[0038] 2. Since the present invention is provided with a freezing pipe sealing device, it can improve the sealing performance between the freezing pipe and the orifice pipe during the construction of the freezing method connection channel, avoiding the infiltration of external water and soil into the tunnel interior and also avoiding the loss of external water and soil.

[0039] 3. Since the present invention adopts a plugging plate to weld and seal the connection between the outer end of the orifice pipe and the freezing pipe, and uses a plug to seal the freezing hole after removing the orifice pipe and cutting the freezing pipe, the construction process is simple and easy to operate, can greatly improve the construction efficiency, and it is not easy to generate leakage at the hole-sealing part after the thaw settlement of the freezing reinforcement body. At the same time, combined with grinding the hole-sealing mortar flat, it ensures the appearance quality of the main tunnel segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is the construction schematic diagram of Step 1 in the construction method of the present invention for the freezing method connection channel;

[0041] Figure 2 isFigure 1 Enlarged schematic view at B in

[0042] Figure 3 It is a construction schematic diagram of step 2 in the construction method for connecting channels by the freezing method of the present invention;

[0043] Figure 4 is Figure 3 Enlarged schematic view at A in

[0044] Figure 5 is Figure 3 Enlarged schematic view at C in

[0045] Figure 6 It is a construction schematic diagram of step 2.5.1 in the construction method for connecting channels by the freezing method of the present invention;

[0046] Figure 7 It is a construction schematic diagram of step 2.5.2 in the construction method for connecting channels by the freezing method of the present invention;

[0047] Figure 8 It is a construction schematic diagram of step 3 in the construction method for connecting channels by the freezing method of the present invention.

[0048] In the figure: 1 Main tunnel segment, 11 Freezing hole, 12 Embedded pipe, 121 Embedded flange, 122 Sealing ring, 123 Waterstop ring, 13 Plug, 131 First limit flange, 132 Rotary joint part, 14 Filler, 15 Manhole box, 2 Freezing pipe, 3 Orifice pipe, 31 Grouting bypass ball valve, 32 Second limit flange, 4 Freezing pipe sealing device, 41 Grease bypass ball valve, 411 Grease, 42 Second gasket, 43 First gasket, 44 End pressing plate, 45 Orifice device, 46 Fixed part, 47 Third gasket, 5 Plugging plate, 6 Sealing mortar for holes. Detailed implementation method

[0049] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0050] A construction method for connecting channels by the freezing method includes the following steps:

[0051] Please refer to Attach Figure 1 and Attach Figure 2 , step 1: Install the main tunnel segment 1.

[0052] The said step 1 includes the following sub-steps:

[0053] Step 1.1: Reserve freezing holes 11 in the main tunnel segment 1 and embed embedded pipes 12 in the freezing holes 11.

[0054] Preferably, when embedding the embedded pipe 12, the axial direction of the embedded pipe 12 is consistent with the designed insertion axial direction of the freezing pipe 2, and the embedded pipe 12 is connected to the steel bar structure inside the main tunnel segment 1.

[0055] Preferably, when embedding the embedded pipe 12, a manhole box 15 is synchronously embedded, and the manhole box 15 is coaxially and fixedly connected to the end of the embedded pipe 12.

[0056] One end of the embedded pipe 12 is formed with an embedded flange 121, and the embedded flange 121 is poured into the main tunnel segment 1. The other end of the embedded pipe 12 is fixedly connected to a manhole box 15, and an operation space can be reserved through the manhole box 15, which is convenient for use during subsequent freezing method construction operations. The manhole box 15 can be fixedly connected to the embedded pipe 12 by welding.

[0057] A water stop ring 123 is provided on the outer wall of the embedded pipe 12, and the embedded pipe 12 is hermetically embedded in the main tunnel segment 1 through the water stop ring 123. The water stop ring 123 can be made of rubber material to ensure the embedding tightness of the embedded pipe 12 in the main tunnel segment 1.

[0058] Step 1.2: Screw and temporarily seal the embedded pipe 12 through a plug 13.

[0059] Preferably, when temporarily sealing the embedded pipe 12 through the plug 13, a filler 14 is arranged between the plug 13 and the embedded pipe 12 to prevent the embedded pipe 12 from being blocked by mortar or the like during construction. The filler 14 can be made of foam material.

[0060] Internal threads are formed on the inner wall of the embedded pipe 12, and external threads are formed at one end of the orifice pipe 3 and one end of the plug 13, so that the orifice pipe 3 can be screwed onto the embedded pipe 12 through the internal and external threads, and the plug 13 can be screwed onto the embedded pipe 12 through the internal and external threads. Through the engagement and screwing of the internal and external threads, the disassembly and assembly are convenient and the installation reliability is high.

[0061] A first limit flange 131 is formed at the edge of the other end of the plug 13. When the plug 13 is connected to the embedded pipe 12, the first limit flange 131 can be attached to the inner wall of the manhole box 15. The first limit flange 131 can play a role in limiting and positioning to ensure that the plug 13 is reliably connected to the embedded pipe 12. The first limit flange 131 and the plug 13 can be integrally formed.

[0062] A screwing part 132 is formed at the other end of the plug 13. The screwing part 132 can adopt an M30 hexagonal nut and is integrally formed on the plug 13 to facilitate the screwing control of the plug 13.

[0063] Please refer to Appendix Figure 3 to Appendix Figure 5 , Step 2: Freezing pipe drilling construction.

[0064] Step 2 described above includes the following sub-steps:

[0065] Step 2.1: Remove the plug 13 and screw the orifice pipe 3 onto the embedded pipe 12. The inner end of the orifice pipe 3 is located inside the main tunnel segment 1, and the outer end of the orifice pipe 3 extends into the tunnel interior.

[0066] Preferably, if there is a filler 14 filled between the plug 13 and the embedded pipe 12, clean the filler 14 synchronously when removing the plug 13.

[0067] A second limiting flange 32 is formed at one end edge of the orifice pipe 3. When the orifice pipe 3 is connected to the embedded pipe 12, the second limiting flange 32 can fit against the inner wall of the manhole box 15. The second limiting flange 32 can play a role in limiting and positioning to ensure that the orifice pipe 3 is reliably connected to the embedded pipe 12. The second limiting flange 32 and the orifice pipe 3 can be integrally formed.

[0068] Sealing rings 122 are provided on the inner wall of the embedded pipe 12. The two sealing rings 122 are respectively located at both ends of the internal thread, so that the embedded pipe 12 can be hermetically connected to the orifice pipe 3 through the sealing rings 122, and the embedded pipe 12 can be hermetically connected to the plug 13 through the sealing rings 122. The sealing rings 122 can be made of rubber material to ensure the sealing performance when the embedded pipe 12 is connected to the plug 13 or the orifice pipe 3.

[0069] Step 2.2: Coaxially connect the freezing pipe sealing device 4 to the outer end of the orifice pipe 3.

[0070] The sealing device includes a second gasket 42, a first gasket 43, an end pressing plate 44 and an orifice device 45; the first gasket 43 is fixedly arranged between one end of the orifice device 45 and the freezing pipe 2 through a fixing member 46, and the first gasket 43 can be hermetically fitted on the surface of the freezing pipe 2; the end pressing plate 44 is arranged at the other end of the orifice device 45, and the second gasket 42 is fixedly arranged between the other end of the orifice device 45 and the end pressing plate 44 through a fixing member 46, and the second gasket 42 can be hermetically fitted on the surface of the freezing pipe 2; a sealed cavity is formed among the first gasket 43, the second gasket 42, the orifice device 45 and the freezing pipe 2.

[0071] Step 2.3: Coaxially insert the freezing pipe 2 into the freezing pipe sealing device 4 and the orifice pipe 3, so that the freezing pipe sealing device 4 hermetically wraps the freezing pipe 2.

[0072] Preferably, both the first gasket 43 and the second gasket 42 are annular structures. The outer edges of the first gasket 43 and the second gasket 42 are flush with the outer edge of the orifice device 45. The inner edges of the first gasket 43 and the second gasket 42 are bent and deformed to tightly fit on the surface of the freezing pipe 2. The first gasket 43 and the second gasket 42 with bent deformation reliably compress the freezing pipe 2, ensuring the sealing performance at the inner circles of the first gasket 43 and the second gasket 42, and also guaranteeing the sealing performance of the sealed cavity, thus ensuring the water-stop effect.

[0073] The orifice device 45 includes one or several orifice device units. The orifice device unit is in an annular structure, and several orifice device units are sequentially coaxially connected through a fixing member 46. Preferably, the number of orifice device units can be increased or decreased according to actual requirements, and one or more can be set. When multiple orifice device units are set, the sealing area of the combined sealing device can be increased, thereby improving the sealing and water-stop effect.

[0074] A third gasket 47 is provided between every two adjacent orifice device units. The third gasket 47 can be hermetically fitted on the surface of the freezing pipe 2. The third gasket 47 is located between the first gasket 43 and the second gasket 42 and divides the sealed cavity into several independent sealed cavity units. The third gasket 47 forms multi-cavity sealing and water-stop among several orifice device units. The sealed cavity units are independent of each other and do not affect each other to ensure the safety, effectiveness and sealing performance of the sealing and water-stop.

[0075] The third gasket 47 is in an annular structure. The outer edge of the third gasket 47 is flush with the outer edge of the orifice device unit. The inner edge of the third gasket 47 is bent and deformed to tightly fit on the surface of the freezing pipe 2, and the bending deformation directions of the first gasket 43, the second gasket 42 and the third gasket 47 are the same. The third gasket 47 with bent deformation reliably compresses the freezing pipe 2, ensuring the sealing performance and independence of the sealed cavity unit, and ensuring and improving the sealing and water-stop effect of each sealed cavity unit.

[0076] The end pressing plate 44 is in an annular structure. The width of the ring of the end pressing plate 44 is slightly larger than the width of the ring of the orifice device 45, so that the outer edge of the end pressing plate 44 is flush with the outer edge of the orifice device 45. The inner diameter of the end pressing plate 44 is slightly smaller than the inner diameter of the orifice device 45 and slightly larger than the outer diameter of the freezing pipe 2. The inner edge of the end pressing plate 44 forms a block and limit for the second gasket 42 to prevent the bending deformation direction of the second gasket 42 from changing and causing sealing failure.

[0077] Step 2.4: Connect a grease bypass ball valve 41 to the freezing pipe sealing device 4, so that the grease bypass ball valve 41 injects grease 411 and seals the freezing pipe 2.

[0078] Preferably, at least one grease bypass ball valve 41 is connected to each orifice device unit to ensure the injection of grease 411, and grease 411 is injected into each sealed cavity unit through the grease bypass ball valve 41.

[0079] Step 2.5: The freezing pipe 2 is drilled, and the injection of grease 411 is maintained during the drilling construction.

[0080] Please refer to the appendix Figure 6 and the appendix Figure 7 As described above, step 2.5 includes the following sub-steps:

[0081] Step 2.5.1: Install a grouting bypass ball valve 31 on the orifice pipe 3, and compensate and reinforce the grouting into the orifice pipe 3 through the grouting bypass ball valve 31.

[0082] Preferably, the grouting bypass ball valve 31 injects double-fluid cement slurry into the gap between the orifice pipe 3 and the freezing pipe 2.

[0083] Step 2.5.2: Remove the freezing pipe sealing device 4, and seal the gap at the connection part between the outer end of the orifice pipe 3 and the freezing pipe 2 through the plugging plate 5.

[0084] Preferably, the plugging plate 5 is of an annular structure, the outer ring edge of the plugging plate 5 is welded and fixed to the outer end of the orifice pipe 3, and the inner ring of the plugging plate 5 is welded and fixed to the outer wall of the freezing pipe 2.

[0085] Please refer to the appendix Figure 8 As shown in the appendix, after the drilling construction of the freezing pipe 2 is completed, the freezing method construction is stopped, and the freezing holes are sealed. The connection channel of the underground tunnel constructed by the freezing method through the freezing pipe 2 adopts the existing process and will not be elaborated here.

[0086] The above step 3 includes the following sub-steps:

[0087] Step 3.1: Drain the brine in the freezing pipe 2, and remove the plugging plate 5 and the orifice pipe 3. The welded plugging plate 5 can be removed by cutting, and the orifice pipe 3 can be removed by screwing.

[0088] Step 3.2: Cut off a part of the freezing pipe 2 so that one end of the cut freezing pipe 2 is located in the embedded pipe 12 to prevent the freezing pipe 2 from being exposed and affecting the sealing of the freezing hole 11 and the smoothing of the inner wall of the main tunnel segment 1.

[0089] Step 3.3: Screw and seal the embedded pipe 12 through the plug 13. The screwing method of the plug 13 in step 3.3 is the same as that of the plug 13 in step 1.2, but no packing 14 needs to be filled in step 3.3, which will not be elaborated here.

[0090] Step 3.4: Inject sealing mortar 6 between the plug 13 and the closed embedded pipe 12 and inside the freezing pipe 2 to fill the space between the plug 13 and the closed embedded pipe 12 and inside the freezing pipe 2, ensuring complete filling inside the freezing hole 11 and achieving an effective sealing effect. The sealing mortar 6 can be cement mortar.

[0091] Preferably, when closing the embedded pipe 12 with the plug 13, if a manhole box 15 is embedded in the freezing hole 11, weld and reinforce the plug 13 and the manhole box 15 to ensure reliable and firm installation of the plug 13.

[0092] Step 3.5: Use the sealing mortar 6 to level the inner wall of the main tunnel segment 1 and restore the original structure of the main tunnel segment 1.

[0093] The above are only the preferred embodiments of the present invention and are not used to limit the protection scope of the invention. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A construction method for connecting channels by the freezing method, characterized in that: It includes the following steps: Step 1: Install the main tunnel segment (1); The said Step 1 includes the following sub-steps: Step 1.1: Reserve freezing holes (11) in the main tunnel segment (1), and embed embedded pipes (12) in the freezing holes (11); Step 1.2: Screw and temporarily seal the embedded pipe (12) through a plug (13); Step 2: Carry out drilling construction for freezing pipes; The said Step 2 includes the following sub-steps: Step 2.1: Remove the plug (13), and screw the orifice pipe (3) onto the embedded pipe (12). The inner end of the orifice pipe (3) is located inside the main tunnel segment (1), and the outer end of the orifice pipe (3) extends into the tunnel interior; Step 2.2: Coaxially connect a freezing pipe sealing device (4) to the outer end of the orifice pipe (3); Step 2.3: Coaxially insert the freezing pipe (2) into the freezing pipe sealing device (4) and the orifice pipe (3), so that the freezing pipe sealing device (4) tightly wraps around the freezing pipe (2); Step 2.4: Connect a grease bypass ball valve (41) to the freezing pipe sealing device (4), and seal the freezing pipe (2) by injecting grease (411) through the grease bypass ball valve (41); Step 2.5: Carry out drilling construction for the freezing pipe (2), and keep injecting grease (411) during the drilling construction process; After the drilling construction of the freezing pipe (2) is completed, stop the freezing method construction and carry out sealing of the freezing holes; The said Step 3 includes the following sub-steps: Step 3.1: Drain the brine in the freezing pipe (2), and remove the plugging plate (5) and the orifice pipe (3); Step 3.2: Cut off part of the freezing pipe (2) so that one end of the cut freezing pipe (2) is located inside the embedded pipe (12); Step 3.3: Screw and seal the embedded pipe (12) through a plug (13); Step 3.4: Inject sealing mortar (6) between the plug (13) and the sealed embedded pipe (12) and inside the freezing pipe (2); Step 3.5: Use the sealing mortar (6) to level the inner wall of the main tunnel segment (1).

2. The construction method for connecting channels by the freezing method according to claim 1, characterized in that: When embedding the said embedded pipe (12), the axial direction of the embedded pipe (12) is consistent with the designed insertion axial direction of the freezing pipe (2), and the embedded pipe (12) is connected to the steel bar structure inside the main tunnel segment (1).

3. The construction method for connecting channels by the freezing method according to claim 1 or 2, characterized in that: When embedding the said embedded pipe (12), synchronously embed a manhole box (15), and the manhole box (15) is coaxially and fixedly connected to the end of the embedded pipe (12).

4. The construction method for connecting channels by the freezing method according to claim 1, characterized in that: When temporarily sealing the embedded pipe (12) through the said plug (13), a filler (14) is arranged between the plug (13) and the embedded pipe (12).

5. The construction method for connecting channels by the freezing method according to claim 4, characterized in that: If there is a filler (14) filled between the plug (13) and the embedded pipe (12), clean the filler (14) synchronously when removing the plug (13).

6. The construction method for connecting channels by the freezing method according to claim 1, characterized in that: The said Step 2.5 includes the following sub-steps: Step 2.5.1: Install a grouting bypass ball valve (31) on the orifice pipe (3), and compensate and grout for reinforcement into the orifice pipe (3) through the grouting bypass ball valve (31); Step 5.2.5: Remove the freezing pipe sealing device (4), and seal the gap at the connection part between the outer end of the orifice pipe (3) and the freezing pipe (2) through a plugging plate (5).

7. The construction method for connecting channels by the freezing method according to claim 6, characterized in that: The described grouting bypass ball valve (31) injects double-fluid cement slurry into the gap between the orifice pipe (3) and the freezing pipe (2).

8. The construction method for connecting channels by the freezing method according to claim 6, characterized in that: The described plugging plate (5) is of an annular structure. The outer ring edge of the plugging plate (5) is fixedly welded to the outer end of the orifice pipe (3), and the inner ring of the plugging plate (5) is fixedly welded to the outer wall of the freezing pipe (2).

9. The construction method for the freeze method connection channel according to claim 1, characterized in that: in When closing the embedded pipe (12) through the described plug (13), if a manhole box (15) is embedded in the freezing hole (11), the plug (13) and the manhole box (15) are welded and reinforced.

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