CN114607409A - Construction method for connecting channel by freezing method - Google Patents

Abstract

The invention discloses a construction method for connecting a channel by a freezing method, which comprises the following steps: step 1: installing a main tunnel segment (1); step 2: drilling a freezing pipe; and step 3: and after the drilling construction of the freezing pipe (2) is finished, stopping the freezing method construction, and sealing the freezing hole. The invention can improve the construction efficiency and the construction quality of the underground tunnel freezing method connecting channel and improve the appearance quality of the tunnel.

Description

Construction Method for Freezing Method Connecting Channels

technical field

The invention relates to a tunnel construction method, in particular to a construction method for connecting channels by a freezing method.

Background technique

At present, most of the connecting passages between underground tunnels are constructed by the process of "horizontal freezing method for soil reinforcement and mine excavation method". Generally, the connecting passages are constructed after the main tunnel is penetrated.

In the freezing method connection channel of the prior art, the main flow of the freezing pipe drilling construction is as follows: according to the design position and angle of the freezing pipe, water drilling holes are made on the segment, and the orifice pipe, gate valve, orifice device, seal, packing and Compression device, frozen pipe drilling construction, use the bypass valve of the orifice pipe to compensate for grouting, remove the sealing devices such as gate valve, orifice device, gasket, packing and pressing device, between the orifice pipe and the frozen pipe The annular space is welded and closed, the frozen tube is re-tested, and the frozen tube is pressed for leak testing. Drilling construction requires opening holes on the tunnel segment to install the orifice pipe, and the orifice pipe also needs to be fixed with expansion screws or steel bars and the segment. The process is complicated and takes up a critical construction period. At the same time, the orifice sealing device has poor water-stopping effect. .

In the freezing method connection channel of the prior art, the main process of sealing the freezing hole is generally as follows: first, the orifice pipe and the freezing pipe are cut to a certain depth in the segment, then the freezing pipe is filled with mortar or concrete, and the steel plate is welded and sealed. For the orifice pipe, construct 2 expansion bolts on the side wall of the segment in the cut area, and then smooth it with mortar. The freezing hole sealing process is complicated, the reliability is low, and the sealing speed is slow. After the frozen solid is melted and settled, leakage is likely to occur at the sealing hole, and the subsequent plugging is difficult.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a construction method for the freezing method connection channel, which can improve the construction efficiency and construction quality of the underground tunnel freezing method connection channel, and improve the appearance quality of the tunnel.

The present invention is realized in this way:

A construction method for connecting a channel by a freezing method, comprising the following steps:

Step 1: Install the main tunnel segment;

Described step 1 includes the following sub-steps:

Step 1.1: Reserve a freezing hole in the main tunnel segment, and pre-embed the pre-embedded pipe in the freezing hole;

Step 1.2: Screw and temporarily seal the embedded pipe through the bulkhead;

Step 2: Drilling the frozen pipe;

Described step 2 includes the following sub-steps:

Step 2.1: Remove the bulkhead, and screw the orifice pipe on the embedded pipe, the inner end of the orifice pipe is located in the main tunnel segment, and the outer end of the orifice pipe extends to the inside of the tunnel;

Step 2.2: Coaxially connect the freezing tube sealing device on the outer end of the orifice tube;

Step 2.3: Insert the freezing tube coaxially into the freezing tube sealing device and the orifice tube, so that the freezing tube sealing device is tightly wrapped on the freezing tube;

Step 2.4: Connect the grease bypass ball valve to the freezing pipe sealing device, so that the grease bypass ball valve can be injected with grease and seal the freezing pipe;

Step 2.5: Freeze the pipe for drilling construction, and keep grease injection during drilling construction;

Step 3: After the frozen pipe drilling is completed, the freezing method construction is stopped, and the frozen hole is sealed;

Described step 3 includes the following sub-steps:

Step 3.1: Drain the brine in the freezing tube, remove the blocking plate and the orifice tube;

Step 3.2: Cut off part of the frozen tube, so that one end of the cut frozen tube is located in the embedded tube;

Step 3.3: Screw and seal the embedded pipe through the bulkhead;

Step 3.4: inject sealing mortar between the bulkhead and the closed embedded pipe and into the freezing pipe;

Step 3.5: Use sealing mortar to smooth the inner wall of the main tunnel segment.

When pre-embedding the pre-embedded pipe, the axial direction of the pre-embedded pipe is consistent with the design insertion axis of the frozen pipe, and the pre-embedded pipe is connected with the steel structure inside the main tunnel segment.

When the pre-embedded pipe is pre-embedded, the hand-hole box is pre-embedded simultaneously, and the hand-hole box is coaxially and fixedly connected with the end of the pre-embedded pipe.

When the pre-buried pipe is temporarily closed by the bulkhead, a filler is arranged between the bulkhead and the pre-buried pipe.

If the filler is filled between the bulkhead and the pre-embedded pipe, the filler should be cleaned simultaneously when the bulkhead is removed.

The described step 2.5 includes the following sub-steps:

Step 2.5.1: Install the grouting bypass ball valve on the orifice pipe, and compensating grouting into the orifice pipe through the grouting bypass ball valve;

Step 5.2.5: Remove the freezing tube sealing device, and seal the gap at the connection between the outer end of the orifice tube and the freezing tube through the blocking plate.

The grouting bypass ball valve injects two-liquid cement slurry into the gap between the orifice pipe and the freezing pipe.

The said blocking plate has a circular structure, the outer ring edge of the blocking plate is welded and fixed with the outer end of the orifice pipe, and the inner ring of the blocking plate is welded and fixed with the outer wall of the freezing pipe.

When the pre-embedded pipe is closed by the bulkhead, if a hand-hole box is pre-embedded in the freezing hole, the bulkhead and the hand-hole box are welded and strengthened.

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

1. Because the present invention is provided with a pre-embedded pipe, the pre-embedded pipe is directly embedded in the main tunnel segment according to the position of the freezing hole, the installation reliability is high, the structures such as the main bars of the main tunnel segment are not damaged, and the bulky head can be screwed together, The pre-buried pipe is temporarily blocked when the freezing method is not used to connect the channel construction to ensure the construction of the main tunnel, and the orifice pipe can be screwed to install the frozen pipe and perform grouting reinforcement. It is easy to disassemble and assemble, which greatly improves the freezing method. Linkage construction efficiency.

2. The present invention is provided with a freezing pipe sealing device, which can improve the sealing performance between the freezing pipe and the orifice pipe during the construction of the freezing method connecting channel, prevent the outside water and soil from infiltrating into the tunnel, and also avoid the outside water and soil loss.

3. In the present invention, the connection between the outer end of the orifice tube and the freezing tube is welded and sealed by the plugging plate, and the freezing hole is blocked with a bulky head after removing the empty orifice tube and cutting the freezing tube. The construction process is simple and easy to operate, and it can be The construction efficiency is greatly improved, and the sealed hole is not easy to leak after the frozen solid is melted.

Description of drawings

Fig. 1 is the construction schematic diagram of step 1 in the construction method for freezing method connection channel of the present invention;

Fig. 2 is the enlarged schematic diagram at B in Fig. 1;

Fig. 3 is the construction schematic diagram of step 2 in the construction method for freezing method connection channel of the present invention;

Fig. 4 is the enlarged schematic diagram at A place in Fig. 3;

Fig. 5 is the enlarged schematic diagram at C place in Fig. 3;

Fig. 6 is the construction schematic diagram of step 2.5.1 of the present invention for the construction method of freezing method connection channel;

Fig. 7 is the construction schematic diagram of step 2.5.2 of the present invention for the construction method of freezing method connection channel;

FIG. 8 is a schematic view of the construction of step 3 in the construction method of the present invention for connecting a channel by a freezing method.

In the figure: 1 main tunnel segment, 11 freezing hole, 12 embedded pipe, 121 embedded flange, 122 sealing ring, 123 water stop ring, 13 bulkhead, 131 first limit flange, 132 screw connection, 14 Packing, 15 Hand Hole Box, 2 Freeze Tube, 3 Orifice Tube, 31 Grouting Bypass Ball Valve, 32 Second Limit Flange, 4 Freeze Tube Seals, 41 Grease Bypass Ball Valve, 411 Grease, 42 Second Seal Pad, 43 First gasket, 44 End pressure plate, 45 Orifice device, 46 Fixing piece, 47 Third gasket, 5 Blocking plate, 6 Blocking mortar.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

A construction method for connecting a channel by a freezing method, comprising the following steps:

Please refer to Figure 1 and Figure 2, Step 1: Install the main tunnel segment 1.

Described step 1 includes the following sub-steps:

Step 1.1: Reserve a freezing hole 11 in the main tunnel segment 1, and pre-embed a pre-embedded pipe 12 in the freezing hole 11.

Preferably, when the pre-embedded pipe 12 is pre-embedded, the axial direction of the pre-embedded pipe 12 is consistent with the design insertion axis of the frozen pipe 2 , and the pre-embedded pipe 12 is connected to the steel structure inside the main tunnel segment 1 .

Preferably, when the pre-embedded pipe 12 is pre-embedded, the hand-hole box 15 is pre-embedded simultaneously, and the hand-hole box 15 is coaxially and fixedly connected to the end of the pre-embedded pipe 12 .

One end of the pre-embedded pipe 12 is formed with a pre-embedded flange 121, the pre-embedded flange 121 is poured into the main tunnel segment 1, and the other end of the pre-embedded pipe 12 is fixedly connected with a hand hole box 15, which can pass through the hand hole. The box 15 reserves an operating space, which is convenient for use in subsequent freezing method construction operations, and the hand hole box 15 can be welded and fixed with the embedded pipe 12 .

The outer wall of the embedded pipe 12 is provided with a water stop ring 123 , and the embedded pipe 12 is sealed and pre-buried 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 pre-embedded sealing performance of the pre-embedded pipe 12 in the main tunnel segment 1 .

Step 1.2: Screw and temporarily seal the embedded pipe 12 through the bulkhead 13 .

Preferably, when the pre-embedded pipe 12 is temporarily closed by the bulkhead 13, a filler 14 is arranged between the bulkhead 13 and the pre-embedded pipe 12 to prevent mortar from blocking the pre-embedded pipe 12 during construction, and the filler 14 can be made of foam material .

The inner wall of the embedded pipe 12 is formed with internal threads, and one end of the orifice pipe 3 and one end of the bulkhead 13 are formed with external threads, so that the orifice pipe 3 can be screwed on the embedded pipe through the internal thread and the external thread. 12, the bulkhead 13 can be screwed on the embedded pipe 12 through the inner thread and the outer thread. The internal and external threads are engaged and screwed together, which is convenient for disassembly and assembly and has high installation reliability.

A first limiting flange 131 is formed at the edge of the other end of the bulkhead 13 . When the bulkhead 13 is connected to the embedded pipe 12 , the first limiting flange 131 can fit on the inner wall of the hand hole box 15 . The first limiting flange 131 can play the role of limiting and positioning, ensuring that the bulkhead 13 is reliably connected to the embedded pipe 12, and the first limiting flange 131 and the bulkhead 13 can be integrally formed.

The other end of the bulkhead 13 is formed with a screwing portion 132 , and the screwing portion 132 can be made of M30 hexagonal nut and integrally formed on the bulky head 13 to facilitate the control of the screwing of the bulky head 13 .

Please refer to Figures 3 to 5, Step 2: Freeze pipe drilling construction.

Described step 2 includes the following sub-steps:

Step 2.1: Remove the bulkhead 13, and screw the orifice pipe 3 on the embedded pipe 12. The inner end of the orifice pipe 3 is located in the main tunnel segment 1, and the outer end of the orifice pipe 3 extends into the tunnel.

Preferably, if the filler 14 is filled between the bulkhead 13 and the embedded pipe 12 , the filler 14 is cleaned synchronously when the bulkhead 13 is removed.

A second limit flange 32 is formed at one end edge of the orifice tube 3. When the orifice tube 3 is connected to the embedded pipe 12, the second limit flange 32 can fit on the hand hole box 15. on the inner wall. The second limiting flange 32 can play a limiting and positioning function to ensure that the orifice pipe 3 is reliably connected to the embedded pipe 12 , and the second limiting flange 32 and the orifice pipe 3 can be integrally formed.

The inner wall of the embedded pipe 12 is provided with a sealing ring 122, and the two sealing rings 122 are respectively located at both ends of the inner thread, so that the embedded pipe 12 can be sealedly connected with the orifice pipe 3 through the sealing ring 122. 12 can be sealingly connected to the bulkhead 13 through a sealing ring 122 . The sealing ring 122 can be made of rubber material to ensure the sealing performance when the embedded pipe 12 is connected with the bulkhead 13 or the orifice pipe 3 .

Step 2.2: On the outer end of the orifice tube 3, coaxially connect the freezing tube sealing device 4.

The sealing device includes a second sealing gasket 42, a first sealing gasket 43, an end pressing plate 44 and an orifice device 45; and the first gasket 43 can be sealingly attached to the surface of the freezing tube 2; the end pressing plate 44 is arranged on the other end of the orifice device 45, and the second gasket 42 is fixedly arranged on the orifice device through the fixing member 46 between the other end of 45 and the end pressing plate 44, and the second gasket 42 can be sealed on the surface of the freezing tube 2; the first sealing gasket 43, the second sealing gasket 42, the orifice device 45 and the freezing tube 2 A sealed cavity is formed between them.

Step 2.3: Insert the freezing tube 2 coaxially into the freezing tube sealing device 4 and the orifice tube 3, so that the freezing tube sealing device 4 is tightly wrapped on the freezing tube 2.

Preferably, the first sealing gasket 43 and the second sealing gasket 42 are both annular structures, and the outer edges of the first sealing gasket 43 and the second sealing gasket 42 are both aligned with the outer ring edge of the orifice device 45 The edges of the inner rings of the first sealing gasket 43 and the second sealing gasket 42 are bent and deformed and pressed against the surface of the freezing tube 2 . The first and second sealing gaskets 43 and 42 that are bent and deformed are used to reliably press the freezing tube 2 to ensure the tightness of the inner rings of the first and second gaskets 43 and 42, as well as the tightness of the sealed cavity. , so as to ensure the water-stop effect.

The orifice device 45 includes one or a plurality of orifice device units, the orifice device unit is in a ring-shaped structure, and the plurality of orifice device units are sequentially connected coaxially through the fixing member 46 . Preferably, the number of orifice device units can be increased or decreased according to actual needs, and one or more can be provided. When multiple orifice device units are provided, the sealing area of the combined sealing device can be increased, thereby improving the sealing and water-stopping effect.

A third sealing gasket 47 is provided between every two adjacent orifice device units. The third sealing gasket 47 can seal and fit on the surface of the freezing tube 2. The third sealing gasket 47 is located on the first sealing gasket. 43 and the second gasket 42, and divide the sealed cavity into several independent sealed cavity units. The third sealing gasket 47 is combined among several orifice device units to form a multi-cavity sealing water stop, and the sealed cavity units are independent of each other and do not affect each other, so as to ensure the safety, effectiveness and sealing of the sealing water stop.

The third sealing gasket 47 has a circular structure, the outer edge of the third sealing gasket 47 is flush with the outer ring edge of the orifice device unit, and the inner ring edge of the third sealing gasket 47 is bent, deformed and pressed tightly. It is attached to the surface of the freezing tube 2, and the bending deformation directions of the first sealing gasket 43, the second sealing gasket 42 and the third sealing gasket 47 are consistent. Reliably pressing the freezing tube 2 by the bent and deformed third gasket 47 ensures the sealing and independence of the sealed cavity unit, and ensures and improves the sealing and water-stopping effect of each sealed cavity unit.

The end pressing plate 44 is of a circular ring structure, and the ring width of the end pressing plate 44 is slightly larger than that of the orifice device 45 , so that the outer ring edge of the end pressing plate 44 is the same as the outer ring edge of the orifice device 45 . Flush, the inner diameter of the end platen 44 is slightly smaller than the inner diameter of the orifice device 45 and slightly larger than the outer diameter of the freezing tube 2 . The second sealing gasket 42 is blocked and limited by the inner ring edge of the end pressing plate 44 to prevent the second sealing gasket 42 from changing its bending deformation direction and causing sealing failure.

Step 2.4: Connect the grease bypass ball valve 41 to the freezing pipe sealing device 4 , so that the grease bypass ball valve 41 can pass through the grease 411 and seal the freezing pipe 2 .

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 .

Step 2.5: Freeze the pipe 2 for drilling construction, and maintain the injection of grease 411 during the drilling construction.

Please refer to accompanying drawing 6 and accompanying drawing 7, described step 2.5 comprises the following sub-steps:

Step 2.5.1: Install the grouting bypass ball valve 31 on the orifice pipe 3, and compensate for grouting reinforcement into the orifice pipe 3 through the grouting bypass ball valve 31.

Preferably, the grouting bypass ball valve 31 injects two-liquid cement grouting into the gap between the orifice pipe 3 and the freezing pipe 2 .

Step 2.5.2: Remove the freezing tube sealing device 4, and seal the gap between the outer end of the orifice tube 3 and the freezing tube 2 through the blocking plate 5.

Preferably, the 5-position annular structure of the blocking plate, the outer edge of the blocking plate 5 is welded and fixed to the outer end of the orifice pipe 3, and the inner ring of the blocking plate 5 is welded and fixed to the outer wall of the freezing pipe 2. .

Please refer to FIG. 8, step 3: after the drilling of the freezing pipe 2 is completed, the freezing method construction is stopped, and the freezing hole is sealed. The connection channel of the underground tunnel constructed by the freezing method using the freezing pipe 2 is performed by using the existing technology, which will not be repeated here.

Described step 3 includes the following sub-steps:

Step 3.1: Drain the brine in the freezing tube 2, remove the blocking plate 5 and the orifice tube 3. The sealing plate 5 fixed by welding can be removed by cutting, and the orifice pipe 3 can be removed by screwing.

Step 3.2: Cut off part of the frozen tube 2, so that one end of the cut frozen tube 2 is located in the pre-embedded tube 12, so as to prevent the frozen tube 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.

Step 3.3: Screw and seal the embedded pipe 12 through the bulkhead 13 . The screw connection of the bulkhead 13 in step 3.3 is the same as the screw connection of the bulkhead 13 in step 1.2, but the filler 14 does not need to be filled in step 3.3, and will not be repeated here.

Step 3.4: Inject sealing mortar 6 between the bulkhead 13 and the closed embedded pipe 12 and in the freezing pipe 2 to fill the space between the bulkhead 13 and the closed embedded pipe 12 and in the freezing pipe 2 to ensure the freezing hole 11 Complete filling of the interior to achieve an effective plugging effect. The sealing mortar 6 can be cement mortar.

Preferably, when the pre-embedded pipe 12 is closed by the bulkhead 13, if a hand hole box 15 is pre-embedded in the freezing hole 11, the bulkhead 13 and the hand hole box 15 are welded and strengthened to ensure reliable and firm installation of the bulkhead 13.

Step 3.5: Use the sealing mortar 6 to smooth the inner wall of the main tunnel segment 1 to restore the original structure of the main tunnel segment 1 .

The above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the present invention. within the scope of protection.

Claims (9)

1. a construction method for freezing method connecting passage is characterized in that: comprise the following steps: Step 1: Install the main tunnel segment (1); Described step 1 includes the following sub-steps: Step 1.1: Reserve a freezing hole (11) in the main tunnel segment (1), and pre-embed a pre-embedded pipe (12) in the freezing hole (11); Step 1.2: screw and temporarily seal the embedded pipe (12) through the bulkhead (13); Step 2: Drilling the frozen pipe; Described step 2 includes the following sub-steps: Step 2.1: Remove the bulkhead (13), and screw the orifice pipe (3) on the embedded pipe (12). The inner end of the orifice pipe (3) is located in the main tunnel segment (1). The outer end of (3) extends into the tunnel; Step 2.2: Coaxially connect the freezing tube sealing device (4) to the outer end of the orifice tube (3); Step 2.3: Insert the freezing tube (2) coaxially into the freezing tube sealing device (4) and the orifice tube (3), so that the freezing tube sealing device (4) is sealed and wrapped on the freezing tube (2); Step 2.4: Connect the grease bypass ball valve (41) to the freezing pipe sealing device (4), so that the grease bypass ball valve (41) can be injected with grease (411) and seal the freezing pipe (2); Step 2.5: freezing the pipe (2) for drilling construction, and maintaining the injection of grease (411) during the drilling construction; Step 3: After the drilling of the freezing pipe (2) is completed, the freezing method construction is stopped, and the freezing hole is sealed; Described step 3 includes the following sub-steps: Step 3.1: Drain the brine in the freezing tube (2), remove the blocking plate (5) and the orifice tube (3); Step 3.2: Cut off part of the frozen tube (2), so that one end of the cut frozen tube (2) is located in the embedded tube (12); Step 3.3: screw and seal the embedded pipe (12) through the bulkhead (13); Step 3.4: inject sealing mortar (6) between the bulkhead (13) and the sealed pre-embedded pipe (12) and into the freezing pipe (2); Step 3.5: Use sealing mortar (6) to smooth the inner wall of the main tunnel segment (1). 2. The construction method for the freezing method connection channel according to claim 1, characterized in that: when the embedded pipe (12) is embedded in advance, the axial direction of the embedded pipe (12) is the same as the freezing pipe (12). 2) The design of the insert is consistent with the axial direction, and the embedded pipe (12) is connected with the reinforcement structure inside the main tunnel segment (1). 3. The construction method for freezing method connection channel according to claim 1 or 2, characterized in that: when the described pre-embedded pipe (12) is pre-buried, the hand hole box (15) is pre-buried synchronously, and the hand hole box (15) is pre-buried synchronously. The hole box (15) is coaxially and fixedly connected with the end of the embedded pipe (12). 4. The construction method for the freezing method connection channel according to claim 1, characterized in that: when the embedded pipe (12) is temporarily closed by the bulkhead (13), the bulkhead (13) and the embedded pipe (12) are temporarily closed. A packing (14) is provided between the tubes (12). 5. The construction method for the freezing method connection channel according to claim 4, characterized in that: if the filler (14) is filled between the bulkhead (13) and the pre-embedded pipe (12), after the unloading When the head (13) is clogged, the packing (14) is cleaned simultaneously. 6. the construction method that is used for freezing method connection channel according to claim 1 is characterized in that: described step 2.5 comprises the following sub-steps: Step 2.5.1: Install the grouting bypass ball valve (31) on the orifice pipe (3), and compensate for grouting reinforcement into the orifice pipe (3) through the grouting bypass ball valve (31); Step 5.2.5: Remove the freezing tube sealing device (4), and close the gap at the connection between the outer end of the orifice tube (3) and the freezing tube (2) through the blocking plate (5). 7. The construction method for the freezing method connection channel according to claim 6, characterized in that: the grouting bypass ball valve (31) is directed to the connection between the orifice pipe (3) and the freezing pipe (2). Two-liquid cement slurry is injected into the gap. 8. The construction method for connecting passages by freezing method according to claim 6, characterized in that: the said blocking plate (5) has a circular ring-shaped structure, and the outer ring edge of the blocking plate (5) and the hole The outer end of the mouth pipe (3) is welded and fixed, and the inner ring of the blocking plate (5) is welded and fixed with the outer wall of the freezing pipe (2). 9. The construction method for connecting passages by freezing method according to claim 1, characterized in that: when the embedded pipe (12) is closed by the bulkhead (13), if the freezing hole (11) is pre-embedded There is a hand hole box (15), and the bulkhead (13) and the hand hole box (15) are welded and strengthened.

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