Large-section rectangular jacking pipe freezing method reinforced steel jacket box abandoned shell receiving construction method

Abstract

According to the large-section rectangular pipe jacking freezing method reinforced steel jacket box abandoned shell receiving construction method, under the condition that a large-section rectangular pipe jacking machine is not started, a receiving well tunnel portal can be chiseled away in advance; by adopting the arrangement of the steel jacket box and backfilling solid substances in the steel jacket box, the water and soil pressure outside the receiving well tunnel portal is balanced, and the long-term stability and safety of the receiving well tunnel portal are ensured. And meanwhile, the influence of freezing on the large-section rectangular pipe jacking machine can be avoided by naturally thawing and freezing the reinforcing body in advance before the large-section rectangular pipe jacking machine jacks and receives the large-section rectangular pipe jacking machine. According to the method, the influence on the surrounding environment, buildings and pipelines is small, and the construction period can be remarkably shortened.

Description

Technical Field

[0001] The invention relates to the technical field of rectangular jacking pipe construction, and in particular to a large-section rectangular jacking pipe freezing method reinforced steel casing abandoned shell receiving construction method. Background Art

[0002] As urban construction enters a period of rapid development, the increasingly prosperous urban environment has brought huge restrictions to construction, resulting in a sharp increase in the difficulty of construction. Rectangular pipe jacking construction technology is increasingly used in underground passages, subway entrance and exit construction, underground integrated pipe corridors and other scenarios. During the rectangular pipe jacking construction process, the entry and reception is the top priority in the pipe jacking construction process.

[0003] The construction process flow of rectangular pipe jacking engineering in the existing technology is: debugging of pipe jacking equipment → chiseling away the surrounding structure by the head of the pipe jacking machine near the upper tunnel door → jacking of soil in the reinforcement area of ​​the starting point of pipe jacking → jacking of normal soil → jacking of soil in the reinforcement area of ​​the tunnel door of the pipe jacking machine receiving well → chiseling away the surrounding structure by the head of the pipe jacking machine near the upper tunnel door → backfilling the receiving well → stopping the machine after receiving → sealing and grouting, etc.

[0004] The complex surrounding environment and the influence of multiple construction environments such as buildings, underground pipelines, construction period requirements, and safety requirements have resulted in increasingly harsh conditions for pipe jacking construction. There is insufficient receiving space, and the width of cement reinforcement does not meet the requirements of conventional pipe jacking construction processes. When dealing with complex hydrogeological conditions such as deep burial depth and pressurized water, the freezing reinforcement process is usually used. This process is highly safe, but has a long reinforcement cycle, high strength, and negative temperatures. While maintaining the original process sequence, it is easy for the pipe jacking machine to have a slow jacking speed, high jacking force, or even be unable to jack in the frozen reinforced soil due to the influence of negative temperatures. It is necessary to wait for the frozen body to thaw before jacking can be advanced, which poses problems such as high construction difficulty, high risk, and long construction period.

[0005] Therefore, it is necessary to provide a large-section rectangular jacking pipe freezing method to reinforce the steel casing abandoned shell receiving construction method, which can solve the problems of difficult jacking in the frozen body of the large-section rectangular jacking pipe, large jacking force, easy freezing and long construction period. Summary of the invention

[0006] The purpose of the present invention is to provide a large-section rectangular jacking pipe freezing method to reinforce the steel casing abandoned shell receiving construction method, which can solve the problems of difficult jacking in the frozen body of the large-section rectangular jacking pipe, large jacking force, easy freezing and long construction period.

[0007] In order to achieve the above object, the technical solution of the present invention is:

[0008] A large-section rectangular jacking pipe freezing method to reinforce steel casing abandoned shell receiving construction method, comprising the following steps:

[0009] Step 1: Construct receiving well enclosure structure;

[0010] Step 2: Excavate and construct the main shaft structure of the launching shaft and the receiving shaft, and embed the tunnel gate steel ring in the main shaft structure;

[0011] Step 3: construct a freezing pipe for the receiving well hole door, and actively freeze and reinforce the soil outside the receiving well hole door to form a frozen reinforced body;

[0012] Step 4: During the active freezing and reinforcement of the portal soil, install the steel casing and fill the gap between the steel casing and the receiving well enclosure structure;

[0013] Step 5: When the frozen reinforcement reaches the freezing strength required by the design according to the depth of the tunnel, the receiving well tunnel door is broken, and the frozen pipe remains frozen during the breaking of the receiving well tunnel door;

[0014] Step 6: The freezing pipe inside the steel ring in the freezing pipe is suspended and pulled out, and the freezing pipe outside the steel ring in the freezing pipe remains frozen;

[0015] Step 7: Install the jacking pipe receiving limit block between the bottom of the steel casing and the steel ring of the tunnel gate;

[0016] Step 8: Backfill the steel casing with solid material and reserve a manhole in the steel casing;

[0017] Step 9: Close the top of the steel casing;

[0018] Step 10: Inject mud through the grouting holes of the steel casing to fill the gaps in the steel casing;

[0019] Step 11: The freezing of the frozen pipe outside the steel ring is suspended, and the hole is sealed, and the frozen reinforcement body begins to thaw naturally;

[0020] Step 12: Install a melting and settling grouting pipe above the tunnel portal, and inject grout through the melting and settling grouting pipe according to the monitoring data to control the settlement of the building structure;

[0021] Step 13: According to the temperature development trend of the frozen reinforcement and the jacking period, the large-section rectangular pipe jacking machine starts to drill the hole;

[0022] Step 14: The large-section rectangular pipe jacking machine is pushed into the steel casing and received;

[0023] Step 15: Confirm the receiving stop position of the large-section rectangular pipe jacking machine. After the large-section rectangular pipe jacking machine is pushed to the receiving stop position and stopped, seal the water and inject grout through the reserved grouting holes on the large-section rectangular pipe jacking machine.

[0024] Step 16: After the water sealing verification is completed, clean the steel casing and seal the gap between the rectangular jacking shell, the steel casing and the steel ring of the tunnel gate of the large-section rectangular jacking machine;

[0025] Step 17: After the steel plate is sealed, cement slurry is injected through the grouting valve reserved on the steel plate to fill the gaps between the steel casing, the tunnel steel ring and the steel plate;

[0026] Step 18: Dismantle the large-section rectangular pipe jacking machine, retain the rectangular pipe jacking shell, and complete the shell disposal and receiving construction of the large-section rectangular pipe jacking machine.

[0027] In the step 2, the side walls of the portal steel ring are parallel to the axis of the top pipe and form an angle α° with the axis of the portal in the Y direction.

[0028] In the step 3, the freezing pipes include a plurality of inner steel ring freezing pipes located within the range of the tunnel gate steel ring and a plurality of outer steel ring freezing pipes located outside the range of the tunnel gate steel ring.

[0029] The step 4 comprises the following sub-steps:

[0030] Step 4.1: Install the steel casing load-bearing base at the bottom of the main structure of the shaft;

[0031] Step 4.2: Install the bottom base plate on the steel casing load-bearing base;

[0032] Step 4.3: Install the steel casing on the bottom plate and connect and fix the steel casing to the steel ring of the door opening;

[0033] Step 4.4: Install the front panel on the front of the steel casing;

[0034] Step 4.5: Use high-strength grouting materials or fine stone concrete and other filling materials to fill the gap between the front slab and the receiving well enclosure structure.

[0035] In the step 3, when the portal soil is frozen and reinforced, a temperature sensing optical fiber is reserved in the frozen reinforcement body; in the step 11, during the natural thawing process of the frozen reinforcement body, the temperature sensing optical fiber reserved in the frozen reinforcement body is connected through a data acquisition device to collect the temperature of the frozen reinforcement body.

[0036] In the step 14, when the large-section rectangular pipe jacking machine is pushed into the steel casing for receiving, according to the stability of the soil in front and behind the large-section rectangular pipe jacking machine, reverse grouting is used to provide pressure through the grouting holes of the steel casing. The grouting pressure value is set according to the water and soil pressure outside the tunnel portal, so that the pressure of the pipe jacking face of the large-section rectangular pipe jacking machine and the water and soil outside the tunnel portal are stable.

[0037] In step 15, the position where the angle formed by the large-section rectangular pipe jacking machine and the tunnel gate is α° is determined as the receiving and stopping position of the large-section rectangular pipe jacking machine, and the rectangular pipe jacking shell of the large-section rectangular pipe jacking machine is ensured to enter the steel ring of the tunnel gate.

[0038] The step 16 comprises the following sub-steps:

[0039] Step 16.1: Open the pressure relief hole reserved on the steel casing to relieve pressure;

[0040] Step 16.2: After the pressure relief is completed, open the manhole and clean the remaining solid matter in the steel casing;

[0041] Step 16.3: During the process of cleaning the solid matter, use steel plates to seal the gaps between the rectangular jacking shell of the large-section rectangular jacking machine and the steel casing and the portal steel ring from top to bottom.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] The present invention completes the removal of the receiving shaft door before the large-section rectangular pipe jacking machine starts, which provides technical feasibility and safety for the long-term stability of the receiving shaft door; at the same time, the frozen reinforcement body is thawed in advance before the large-section rectangular pipe jacking machine is jacked in and received, thereby avoiding the difficulty of the large-section rectangular pipe jacking machine in jacking in the frozen reinforcement body, large jacking force, easy freezing, etc., which can greatly save the construction period of the pipe jacking construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present disclosure.

[0045] Figure 1 It is a plan construction schematic diagram of the large-section rectangular jacking pipe freezing method reinforcement steel casing abandoned shell receiving construction method of the present invention (large-section rectangular jacking machine is not received);

[0046] Figure 2 It is a schematic diagram of the vertical construction of the large-section rectangular jacking pipe freezing method reinforcement steel casing abandoned shell receiving construction method of the present invention (large-section rectangular jacking machine is not received);

[0047] Figure 3 It is a plan construction schematic diagram of a large-section rectangular pipe jacking machine receiving a large-section rectangular pipe jacking machine using a freezing method to reinforce a steel casing abandoned shell of the present invention;

[0048] Figure 4 It is a front view of the construction method for receiving abandoned steel casing by freezing method for reinforcing large-section rectangular pipe jacking according to the present invention (receiving large-section rectangular pipe jacking machine).

[0049] In the figure, 1-receiving shaft enclosure structure, 2-vertical shaft main structure, 3-jacking pipe axis, 4-tunnel steel ring, 5-tunnel Y-axis, 6-freezing pipe, 7-freezing reinforcement body, 8-steel casing load-bearing base, 9-bottom base plate, 11-front cover plate, 12-bolt or welding connection, 13-high-strength grouting material or fine stone concrete, 14-receiving shaft tunnel door, 15-freezing pipe in steel ring, 16-freezing pipe outside steel ring, 17-jacking pipe receiving limit and track, 18-solid matter, 19-steel casing top cover, 20-steel casing grouting hole, 21-data collector, 22-temperature sensing optical fiber, 23-melting and sinking grouting pipe, 24-large-section rectangular jacking machine, 25-pressure relief hole, 26-manhole, 27-steel plate, 28-rectangular jacking pipe shell, 29-steel casing, 30-grouting valve, 31-rectangular jacking machine grouting hole. DETAILED DESCRIPTION

[0050] The following is a further detailed description of a large-section rectangular jacking pipe freezing method reinforcement steel casing abandoned shell receiving construction method proposed by the present invention in combination with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0051] A large-section rectangular jacking pipe freezing method to reinforce steel casing abandoned shell receiving construction method, comprising the following steps:

[0052] Please see attached Figure 1 , Step 1: Construct the receiving well enclosure structure 1.

[0053] The receiving well enclosure structure 1 is constructed using conventional techniques according to the enclosure scope and design requirements of the receiving well, which will not be described in detail here.

[0054] Please see attached Figure 1 Step 2: excavate and construct the main shaft structure 2 of the starting shaft and the receiving shaft. During the backbuilding of the main shaft structure 2, a tunnel door steel ring 4 is pre-buried in the main shaft structure 2 for the jacking of the large-section rectangular jacking machine 24.

[0055] In the step 2, the side walls of the portal steel ring 4 are parallel to the top pipe axis 3 and form an angle α° with the Y-direction axis 5 of the portal.

[0056] Please see attached Figure 1 Step 3: construct a freezing pipe 6 for the receiving well hole door, and actively freeze and reinforce the soil outside the receiving well hole door 14 to form a frozen reinforcement body 7.

[0057] Please see attached Figure 2In the step 3, the freezing pipes 6 include a plurality of inner steel ring freezing pipes 15 located within the scope of the tunnel gate steel ring 4 and a plurality of outer steel ring freezing pipes 16 located outside the scope of the tunnel gate steel ring 4.

[0058] Please see attached Figure 1 , Step 4: During the active freezing and reinforcement of the tunnel portal soil, install the steel casing 29 and fill the gap between the steel casing 29 and the receiving well enclosure structure 1.

[0059] By isolating the receiving well enclosure structure 1, the installation of the steel casing 29 can be carried out simultaneously with the freezing and reinforcement of the soil, so as to shorten the construction period.

[0060] Please see attached Figure 1 and attached Figure 2 , the step 4 comprises the following sub-steps:

[0061] Step 4.1: Install the steel casing load-bearing base 8 at the bottom of the shaft main structure 2.

[0062] Step 4.2: Install the bottom base plate 9 on the steel casing load-bearing base 8.

[0063] Step 4.3: Install the steel casing 29 on the bottom base plate 9, and connect and fix the steel casing 29 to the door opening steel ring 4.

[0064] Preferably, the steel casing 29 and the door opening steel ring 4 can be connected by bolts or welding 12 to ensure good water tightness between the steel casing 29 and the door opening steel ring 4.

[0065] Step 4.4: Install the front panel 11 on the front of the steel casing 29.

[0066] Step 4.5: Use a filling material 13 such as high-strength grouting material or fine stone concrete to fill the gap between the front slab 11 and the receiving well enclosure structure 1.

[0067] Please see attached Figure 2 Step 5: When the frozen reinforcement body 7 reaches the freezing strength required by the design according to the depth of the tunnel portal, the receiving shaft tunnel portal 14 is broken. During the breaking of the receiving shaft tunnel portal 14, the freezing pipe 6 remains frozen, that is, the freezing liquid in the freezing pipe 6 is kept in a circulating state to ensure the strength and stability of the frozen reinforcement body 7 at the tunnel portal during and after the tunnel portal is chiseled out.

[0068] Please see attached Figure 2 , Step 6: The freezing pipe 15 inside the steel ring of the freezing pipe 6 is suspended from freezing and pulled out, and the freezing pipe 16 outside the steel ring of the freezing pipe 6 remains frozen.

[0069] Please see attached Figure 2 , Step 7: Install the top pipe receiving limit block 17 between the bottom of the steel casing 29 and the tunnel door steel ring 4.

[0070] Preferably, the jacking pipe receiving limit block 17 is a wedge-shaped structure that gradually thickens along the jacking direction of the large-section rectangular jacking machine 24 , and is used to limit the jacking distance of the large-section rectangular jacking machine 24 .

[0071] Please see attached Figure 2 , Step 8: Use solid matter 18 to backfill the steel casing 29 and reserve a manhole 26 in the steel casing 29 .

[0072] Preferably, the solid material 18 can be made of clay, low-cement soil, etc. The solid material 18 is backfilled and compacted layer by layer to ensure that the solid material 18 is backfilled densely to balance the water and soil pressure outside the receiving wellbore door 14 and ensure the long-term stability and safety of the receiving wellbore door 14.

[0073] Please see attached Figure 2 , Step 9: Close the top of the steel casing 29 through the steel casing top cover 19.

[0074] Please see attached Figure 2 Step 10: Inject mud through the steel casing grouting holes 20 reserved on the top cover plate 19 of the steel casing to fill the gaps in the steel casing 29.

[0075] Please see attached Figure 2 , Step 11: The freezing of the steel ring outer freezing pipe 16 is suspended, and the hole is sealed, and the frozen reinforcement body 7 begins to thaw naturally.

[0076] Active freezing of freezing pipes and stopping freezing and sealing the holes are conventional soil reinforcement processes in underground engineering construction and will not be described in detail here.

[0077] Please see attached Figure 2 In the step 3, when the tunnel portal soil is frozen and reinforced, a temperature sensing optical fiber 22 is reserved in the frozen reinforcement body 7; in the step 11, during the natural thawing process of the frozen reinforcement body 7, the temperature sensing optical fiber 22 reserved in the frozen reinforcement body 7 is connected through the data acquisition device 21, and the temperature of the frozen reinforcement body 7 is collected.

[0078] The temperature change trend of the frozen reinforcement body 7 during natural thawing determines the jacking safety and jacking progress of the large-section rectangular pipe jacking machine 24 jacking into the receiving well. Therefore, the natural thawing temperature of the frozen reinforcement body 7 is collected or periodically collected through the temperature sensing optical fiber 22. The number of temperature sensing optical fibers 22 can be adaptively set according to actual needs.

[0079] Please see attached Figure 2 Step 12: construct a melting-settling grouting pipe 23 above the tunnel portal, and inject grout through the melting-settling grouting pipe 23 according to the monitoring data to control the settlement of structures such as the surface and pipelines.

[0080] Melt-sinking grouting technology is a conventional technical means for underground engineering construction, and the process of melt-sinking grouting will not be described in detail here.

[0081] Step 13: According to the temperature development trend of the frozen reinforcement body 7 and the jacking period, the large-section rectangular jacking machine 24 starts to jack out the hole.

[0082] Please see attached Figure 3 Step 14: The large-section rectangular pipe jacking machine 24 is pushed into the steel casing 29 and the large-section rectangular pipe jacking machine 24 is received.

[0083] The reception of the large-section rectangular pipe jacking machine 24 is a conventional construction process in the rectangular pipe jacking project, and its specific process will not be repeated here.

[0084] In the step 14, when the large-section rectangular pipe jacking machine 24 is pushed into the steel casing 29 for reception, according to the stability of the soil in front and behind the large-section rectangular pipe jacking machine 24, reverse grouting pressure can be provided through the steel casing grouting hole 20. The grouting pressure value can be set according to the water and soil pressure outside the tunnel portal to ensure the stability of the pipe jacking face pressure of the large-section rectangular pipe jacking machine 24 and the water and soil outside the tunnel portal.

[0085] Step 15: confirm the receiving stop position of the large-section rectangular pipe jacking machine 24 . After the large-section rectangular pipe jacking machine 24 is pushed to the receiving stop position and stopped, water is sealed and grouting is performed through the reserved grouting holes 31 on the large-section rectangular pipe jacking machine 24 .

[0086] The water sealing grouting of the large-section rectangular pipe jacking machine 24 is a conventional construction process in rectangular pipe jacking engineering, and its specific process will not be described in detail here.

[0087] Please see attached Figure 3 and attached Figure 4 In the step 15, the position where the angle formed by the large-section rectangular pipe jacking machine 24 and the tunnel gate is α° is determined as the receiving and stopping position of the large-section rectangular pipe jacking machine 24, and it is necessary to ensure that the rectangular pipe jacking shell 28 of the large-section rectangular pipe jacking machine 24 enters the tunnel gate steel ring 4.

[0088] Please see attached Figure 3 and attached Figure 4 , Step 16: After the water sealing verification is completed, clean the steel casing 29 and seal the gap between the rectangular jacking shell 28 of the large-section rectangular jacking machine 24, the steel casing 29 and the tunnel steel ring 4.

[0089] The step 16 comprises the following sub-steps:

[0090] Step 16.1: Open the pressure relief hole 25 reserved on the steel casing 29 to relieve pressure.

[0091] Step 16.2: After the pressure relief is completed, the manhole 26 is opened and the remaining solid matter 18 in the steel casing 29 is cleaned.

[0092] Step 16.3: During the process of cleaning the solid matter 18, the gaps between the rectangular pipe jacking shell 28 of the large-section rectangular pipe jacking machine 24 and the steel casing 29 and the portal steel ring 4 are blocked from top to bottom with steel plates 27.

[0093] Please see attached Figure 4 Step 17: After the steel plate 27 is sealed, cement slurry is injected through the grouting valve 30 reserved on the steel plate 27 to fill the gaps between the steel casing 29, the tunnel steel ring 4, and the steel plate 27.

[0094] Step 18: dismantle the large-section rectangular pipe jacking machine 24, retain the rectangular pipe jacking shell 28, and complete the shell disposal and receiving construction of the large-section rectangular pipe jacking machine 24.

[0095] In extremely harsh construction environments, the construction method of the present invention can effectively deal with the impact and related problems caused by the use of freezing method to reinforce the receiving well door on the jacking of the large-section rectangular pipe jacking machine. Specifically, the receiving well door 14 can be chiseled out in advance when the large-section rectangular pipe jacking machine has not yet started. By adopting the setting of the steel casing 29 and backfilling the solid material 18 inside it to balance the water and soil pressure outside the receiving well door 14, the long-term stability and safety of the receiving well door 14 are ensured. At the same time, before the large-section rectangular pipe jacking machine 24 is jacked in, the reinforced body 7 can be naturally thawed in advance to avoid the impact of freezing on the large-section rectangular pipe jacking machine 24. The method of the present invention not only has less impact on the surrounding environment, buildings and pipelines, but also can significantly shorten the construction period.

[0096] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A large-section rectangular jacking pipe freezing method to reinforce steel casing abandoned shell receiving construction method, characterized in that: The following steps are involved: Step 1: construct the receiving well enclosure structure (1); Step 2: excavating and constructing the main shaft structure (2) of the launching shaft and the receiving shaft, and pre-embedding the tunnel gate steel ring (4) in the main shaft structure (2); Step 3: construct a receiving well hole door freezing pipe (6), and actively freeze and reinforce the soil outside the receiving well hole door (14) to form a frozen reinforcement body (7); Step 4: During the active freezing and reinforcement of the tunnel portal soil, a steel casing (29) is installed and the gap between the steel casing (29) and the receiving well enclosure structure (1) is filled; Step 5: When the frozen reinforcement body (7) reaches the freezing strength required by the design according to the depth of the tunnel, the receiving well tunnel door (14) is broken, and the freezing pipe (6) remains frozen during the breaking of the receiving well tunnel door (14); Step 6: The freezing of the inner steel ring freezing pipe (15) in the freezing pipe (6) is suspended and pulled out, while the outer steel ring freezing pipe (16) in the freezing pipe (6) remains frozen; Step 7: Install the jacking pipe receiving limit block (17) between the bottom of the steel casing (29) and the tunnel door steel ring (4); Step 8: Backfill the steel casing (29) with solid matter (18) and reserve a manhole (26) in the steel casing (29); Step 9: Close the top of the steel casing (29); Step 10: injecting mud liquid through the grouting hole (20) of the steel casing to fill the gap in the steel casing (29); Step 11: The freezing of the steel ring outer freezing pipe (16) is suspended, and the hole is sealed, and the frozen reinforcement body (7) begins to thaw naturally; Step 12: construct a melting and settling grouting pipe (23) above the tunnel portal, and inject grout through the melting and settling grouting pipe (23) according to monitoring data to control the settlement of the building structure; Step 13: According to the temperature development trend of the frozen reinforcement body (7) and the jacking period, the large-section rectangular jacking machine (24) starts to jack the hole; Step 14: The large-section rectangular pipe jacking machine (24) is pushed into the steel casing (29) and the large-section rectangular pipe jacking machine (24) is received; Step 15: confirming the receiving stop position of the large-section rectangular pipe jacking machine (24), after the large-section rectangular pipe jacking machine (24) is pushed to the receiving stop position and stopped, sealing and grouting are performed through the reserved grouting holes (31) for the pipe jacking machine on the large-section rectangular pipe jacking machine (24); Step 16: After the water sealing verification is completed, the steel casing (29) is cleaned and the gaps between the rectangular jacking casing (28) of the large-section rectangular jacking machine (24), the steel casing (29) and the tunnel steel ring (4) are sealed; Step 17: After the steel plate (27) is sealed, cement slurry is injected through the grouting valve (30) reserved on the steel plate (27) to fill the gaps between the steel casing (29), the tunnel steel ring (4) and the steel plate (27); Step 18: dismantle the large-section rectangular pipe jacking machine (24), retain the rectangular pipe jacking shell (28), and complete the shell disposal and receiving construction of the large-section rectangular pipe jacking machine (24).

2. The large-section rectangular jacking pipe freezing method reinforcement steel casing abandoned shell receiving construction method as claimed in claim 1 is characterized in that: In the step 2, the side walls of the portal steel ring (4) are parallel to the top pipe axis (3) and form an angle α° with the Y-direction axis (5) of the portal.

3. The large-section rectangular jacking pipe freezing method reinforcement steel casing abandoned shell receiving construction method as claimed in claim 1 is characterized in that: In the step 3, the freezing pipes (6) include a plurality of inner steel ring freezing pipes (15) located within the range of the tunnel gate steel ring (4) and a plurality of outer steel ring freezing pipes (16) located outside the range of the tunnel gate steel ring (4).

4. The large-section rectangular jacking pipe freezing method reinforcement steel casing abandoned shell receiving construction method as claimed in claim 1, characterized in that: The step 4 comprises the following sub-steps: Step 4.1: Install a steel casing load-bearing base (8) at the bottom of the shaft main structure (2); Step 4.2: Install the bottom base plate (9) on the steel casing load-bearing base (8); Step 4.3: Install the steel casing (29) on the bottom base plate (9), and connect and fix the steel casing (29) to the door opening steel ring (4); Step 4.4: Install the front panel (11) on the front of the steel casing (29); Step 4.5: Use a filling material (13) such as high-strength grouting material or fine stone concrete to fill the gap between the front slab (11) and the receiving well enclosure structure (1).

5. The large-section rectangular jacking pipe freezing method reinforcement steel casing abandoned shell receiving construction method as claimed in claim 1, characterized in that: In the step 3, when the tunnel portal soil is frozen and reinforced, a temperature sensing optical fiber (22) is reserved in the frozen reinforcement body (7); in the step 11, during the natural thawing process of the frozen reinforcement body (7), the temperature sensing optical fiber (22) reserved in the frozen reinforcement body (7) is connected via a data acquisition device (21) to collect the temperature of the frozen reinforcement body (7).

6. The large-section rectangular jacking pipe freezing method reinforcement steel casing abandoned shell receiving construction method as claimed in claim 1, characterized in that: In the step 14, when the large-section rectangular pipe jacking machine (24) is pushed into the steel casing (29) for receiving, according to the stability of the soil in front and behind the large-section rectangular pipe jacking machine (24), reverse grouting is provided through the steel casing grouting hole (20) to provide pressure, and the grouting pressure value is set according to the water and soil pressure outside the tunnel portal, so that the pressure of the pipe jacking face of the large-section rectangular pipe jacking machine (24) and the water and soil outside the tunnel portal are stable.

7. The large-section rectangular jacking pipe freezing method reinforcement steel casing abandoned shell receiving construction method as claimed in claim 1, characterized in that: In the step 15, the position where the angle formed between the large-section rectangular pipe jacking machine (24) and the tunnel door is α° is determined as the receiving and stopping position of the large-section rectangular pipe jacking machine (24), and it is ensured that the rectangular pipe jacking shell (28) of the large-section rectangular pipe jacking machine (24) enters the tunnel door steel ring (4).

8. The large-section rectangular jacking pipe freezing method reinforcement steel casing abandoned shell receiving construction method as claimed in claim 1, characterized in that: The step 16 comprises the following sub-steps: Step 16.1: Open the pressure relief hole (25) reserved on the steel casing (29) to relieve pressure; Step 16.2: After the pressure relief is completed, the manhole (26) is opened and the remaining solid matter (18) in the steel casing (29) is cleaned; Step 16.3: During the process of cleaning the solid matter (18), the gaps between the rectangular pipe jacking shell (28) of the large-section rectangular pipe jacking machine (24), the steel casing (29), and the portal steel ring (4) are sealed from top to bottom with steel plates (27).

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