Composite stratum multi-cutter head rectangular pipe jacking blind area processing structure and method

Abstract

The application discloses a composite stratum multi-cutter disc rectangular pipe jacking blind area processing structure and method, comprising a drilling and blasting integrated processing structure, defining the advancing direction of the pipe jacking machine as the front, the drilling and blasting integrated processing structure comprising a drilling module and a blasting module connected in sequence from front to back, the blasting module rear end being connected with a drilling machine through an adapter pipe; a channel is arranged in the soil chamber corresponding to the cutter disc blind area of the multi-cutter disc rectangular pipe jacking machine, the drilling and blasting integrated processing structure being arranged in the channel, and a valve being arranged on the side of the channel close to the cutter disc. The drilling and blasting integrated processing structure can drill and excavate the hard rock in the blind area of the pipe jacking machine and perform blasting to form dense cracks in the blind area, break the originally hard rock, and thus realize full-face construction of the pipe jacking machine in the composite stratum.

Description

Technical Field

[0001] This invention relates to the field of tunnel engineering construction technology, specifically to a structure and method for handling blind spots in composite strata using a multi-cutterhead rectangular pipe jacking system. Background Technology

[0002] In the development of urban underground space, in order to minimize the disturbance to the ground surface caused by underground construction and ensure the normal passage of surface traffic and the normal use of surface structures, the construction methods for urban underground space have gradually shifted from traditional mining methods to low-disturbance construction methods such as tunnel boring machines (TBMs) and pipe jacking. Pipe jacking technology is low-cost and has a short construction period, therefore it has been widely used in small and medium-sized utility tunnel and utility gallery projects.

[0003] Compared to circular jacking pipes, multi-cutterhead rectangular jacking pipes offer nearly 20% higher space utilization, significantly reducing construction time and costs. However, multi-cutterhead rectangular jacking pipes have certain blind spots. Figure 1 This diagram shows the cutterhead structure of a typical extra-large cross-section rectangular pipe jacking system in China. The pipe jacking system has seven cutterheads: four smaller cutterheads at the top (3500mm diameter) and three larger cutterheads at the bottom (4800mm diameter). The corresponding blind zones created by the cutterheads are shown below. Figure 2 As shown, when this multi-cutterhead rectangular pipe jacking method is used in composite strata and full-section hard rock strata, a series of adverse problems will occur, such as difficulty in attitude control, difficulty in jacking, and damage to the cutterhead and shield. It is impossible to achieve rapid full-section advancement of the rectangular pipe jacking. At present, there is no precedent for full-section tunneling in composite strata and full-section hard rock strata. This limits the progress of rectangular pipe jacking construction technology and also restricts urban development.

[0004] Therefore, in order to enable full-section construction of multi-cutterhead rectangular pipe jacking in composite strata and full-section hard rock strata, and to ensure the safety and efficiency of multi-cutterhead rectangular pipe jacking during construction in composite strata and full-section hard rock strata, it is necessary to propose a method for handling blind zones of multi-cutterhead rectangular pipe jacking in composite strata. Summary of the Invention

[0005] To address the shortcomings of the existing technology and enable full-section construction of multi-cutterhead rectangular pipe jacking in composite strata and even full-section hard rock strata, ensuring the safety and efficiency of multi-cutterhead rectangular pipe jacking construction in composite strata and full-section hard rock strata, this invention provides a structure and method for handling blind zones of multi-cutterhead rectangular pipe jacking in composite strata.

[0006] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0007] A composite stratum multi-cutterhead rectangular pipe jacking blind zone treatment structure includes a drilling and blasting integrated treatment structure. The direction of travel of the pipe jacking machine is defined as forward. The drilling and blasting integrated treatment structure includes a drilling module and a blasting module connected sequentially from front to back. The rear end of the blasting module is connected to the drilling machine via a transfer pipe. A channel is provided in the soil chamber corresponding to the cutterhead blind zone of the multi-cutterhead rectangular pipe jacking machine. The drilling and blasting integrated treatment structure is set in the channel. A valve is provided on the side of the channel near the cutterhead.

[0008] Furthermore, the drilling module employs a pneumatic impact hammer, comprising an impact rod and a reaming hammer head. The impact rod is connected to an air compressor via an air circuit, and the air compressor provides high-pressure air to drive the impact rod and the reaming hammer head to move.

[0009] Furthermore, the blasting module includes a liquid CO2 storage pipe and an energy release pipe. The liquid CO2 storage pipe includes a main body, with the energy release pipe connected to the front end and a filling end at the rear end. Liquid CO2 is filled into the main body through the filling end. An excitation pipe is provided inside the main body, which heats up to vaporize the liquid CO2. The energy release pipe has a main airflow pipe and multiple branch airflow pipes connected to the main airflow pipe. The branch airflow pipes extend to the wall of the energy release pipe to form an energy release port. An extension pipe is connected to the rear end of the main airflow pipe. The extension pipe extends into the liquid CO2 storage pipe and has a sealing plate and a rupture plate.

[0010] Furthermore, the excitation tube contains a heating element and a chemical agent, with the heating element providing heat for the chemical agent reaction; the main components of the chemical agent are potassium perchlorate, ammonium oxalate, and salicylic acid.

[0011] Furthermore, the cutterhead blind zone of the multi-cutterhead rectangular pipe jacking machine includes multiple independent central blind zones and edge blind zones. For each blind zone, at least one channel for installing the integrated drilling and blasting treatment structure is provided. In the central blind zone, the channel is located in the center of the central blind zone, and in the edge blind zone, the channel is located on the side of the edge blind zone close to the outline of the pipe jacking machine.

[0012] Furthermore, two channels are provided in each edge blind zone, and the two channels are arranged side by side along the outline of the pipe jacking machine.

[0013] A method for blind zone treatment using the above-mentioned composite formation multi-cutterhead rectangular pipe jacking blind zone treatment structure includes the following steps:

[0014] S1: The pipe jacking machine is tunneling normally;

[0015] S2. When the pipe jacking machine encounters a complex geological formation and stops, the valve in the tunnel opens, and the drilling and blasting integrated treatment structure advances forward under the action of the drilling machine until the hole-reaming hammer touches the tunnel interface.

[0016] S3. The air compressor is turned on, providing high-pressure air to drive the impact rod and the expanding hammer head to move, hammering the hard rock, breaking the hard rock into powder, and then blowing it out of the hole through the hole on the expanding hammer head through the high-pressure air.

[0017] S4. After the drilling module enters the predetermined depth, the heating tube inside the excitation tube is energized, and the excitation tube instantly generates high temperature, which forces the liquid CO2 in the main tube to rapidly vaporize and generate high pressure, breaking through the sealing plate and rupture plate in the extension tube. It is released from the energy release port of the energy release tube through the main air flow pipe and the branch air flow pipe, and acts on the surrounding hard rock, thereby generating many cracks inside the rock and fracturing the hard rock.

[0018] S5. Retract the integrated drilling and blasting treatment structure, close the valves in the passage, and the pipe jacking machine continues to excavate;

[0019] S6. Replace the extension pipe, fill it with liquid CO2, and prepare for blasting the hard rock in the next area.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] The integrated drilling and blasting structure of this invention can drill and blast hard rock in the blind zone of the pipe jacking machine, thereby forming dense cracks inside the blind zone and breaking the originally hard rock, thus realizing full-section construction of the pipe jacking machine in complex strata and full-section hard rock strata areas.

[0022] The integrated drilling and blasting structure of this invention uses a pneumatic impact hammer to drill holes, and then uses carbon dioxide to precisely blast hard rock. It does not require explosive charges, has a low degree of hazard, and does not require changing to other tools after drilling, resulting in high construction efficiency. The pneumatic impact hammer itself also has good explosion-proof effect and can be reused. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a typical multi-cutterhead rectangular jacking cutterhead structure in the prior art;

[0025] Figure 2 yes Figure 1 The diagram shows the blind zone of the rectangular jacking pipe with a multi-blade head.

[0026] Figure 3 This is a schematic diagram of the location structure of the through hole in the soil chamber in this invention;

[0027] Figure 4 This is a schematic diagram of the integrated drilling and blasting treatment structure in this invention.

[0028] Reference numerals: 1-Drilling module, 2-Blasting module, 3-Adapter pipe, 4-Channel, 11-Impact rod, 12-Reamer hammer, 13-Air compressor, 21-Liquid CO2 storage pipe, 22-Energy release pipe, 23-Filling end, 24-Excitation pipe, 25-Main airflow pipe, 26-Branch airflow pipe, 27-Energy release port, 28-Extension pipe, 29-Sealing plate, 30-Fracturing plate, 51-Central blind zone, 52-Edge blind zone. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] A composite stratum multi-cutterhead rectangular pipe jacking blind zone treatment structure includes a drill-and-blast integrated treatment structure. The direction of travel of the pipe jacking machine is defined as forward. The drill-and-blast integrated treatment structure includes a drilling module 1 and a blasting module 2 connected sequentially from front to back. The rear end of the blasting module 2 is connected to the drilling rig via a transfer pipe 3. A channel 4 is provided within the soil chamber corresponding to the cutterhead blind zone of the multi-cutterhead rectangular pipe jacking machine. The drill-and-blast integrated treatment structure is installed within the channel 4, and a valve is provided on the side of the channel 4 near the cutterhead. The drill-and-blast integrated treatment structure is located within the channel and does not affect the normal excavation of the pipe jacking machine. The valve at the channel opening is closed to prevent excavated soil from entering the channel. The valve is only opened when the pipe jacking machine encounters hard rock and stops, allowing the drilling rig to advance the drill-and-blast integrated treatment structure.

[0031] Specifically, the drilling module 1 uses a pneumatic impact hammer, including an impact rod 11 and a reaming hammer head 12. The impact rod 11 is connected to an air compressor 13 through an air circuit. The air compressor 13 provides high-pressure air to drive the impact rod 11 and the reaming hammer head 12 to move, hammering hard rock, breaking the hard rock into powder, and then blowing it out of the hole through the hole on the reaming hammer head via high-pressure air.

[0032] The blasting module 2 uses carbon dioxide blasting and includes two parts: a liquid CO2 storage pipe 21 and an energy release pipe 22. The liquid CO2 storage pipe 21 includes a main body, the front end of which is connected to the energy release pipe 22, and the rear end is provided with a filling end 23, which can inject liquid CO2 through professional equipment. The main body is provided with an excitation pipe 24. The excitation pipe 24 contains a heating element and chemical agents, and the heating element provides heat for the chemical agent reaction. The energy release pipe 22 is provided with a main airflow pipe 25 and multiple branch airflow pipes 26 connected to the main airflow pipe 25. The branch airflow pipes 26 extend to the wall of the energy release pipe to form an energy release port 27. The rear end of the main airflow pipe 25 is connected to an extension pipe 28, which extends into the liquid CO2 storage pipe 21. The extension pipe 28 is provided with a sealing plate 29 and a rupture plate 30. Liquid CO2 does not react under normal temperature and pressure conditions and under the vibration conditions of pneumatic impact hammer rock breaking. The chemical agents in the excitation tube 24 mainly consist of potassium perchlorate, ammonium oxalate, salicylic acid and other chemical powders. Its characteristic is that it will only react when excited by strong current in an oxygen-free environment, producing high heat but not combustion. However, it will not react in an oxygen-rich environment, whether it is electrically excited or heated by flame. After the drilling module enters the predetermined depth, the heating tube in the excitation tube is energized, and high temperature is generated instantly in the excitation tube, forcing the liquid CO2 in the main tube to rapidly vaporize, expanding its volume by more than 600 times and generating high pressure. This pressure breaks through the sealing and rupture plates in the extension tube 28, and is released from the energy release port 27 of the energy release tube through the main airflow tube 25 and the branch airflow tube 26. It acts on the surrounding hard rock, thereby creating many cracks inside the rock and fracturing the hard rock.

[0033] The liquid CO2 storage pipe can be filled with liquid CO2 multiple times, and the sealing and fracturing discs in the extension pipe can also be replaced. After a single blast, the drill pipe is immediately pulled out, the extension pipe is replaced, liquid CO2 is filled, and the blasting of the next area of ​​hard rock is carried out. By repeating this cycle multiple times, all the hard rock in the pipe jacking blind zone can be cracked and broken. The broken hard rock can be discharged by a large-diameter auger, thus realizing the treatment of hard rock in the pipe jacking blind zone.

[0034] The cutterhead blind zone of the multi-cutterhead rectangular pipe jacking machine includes multiple independent central blind zones 51 and edge blind zones 52. For each blind zone, at least one channel for installing the integrated drilling and blasting treatment structure is provided. In the central blind zone, the channel is located in the center of the central blind zone 51. For the edge blind zone 52, the channel is located on the side of the edge blind zone 52 close to the outline of the pipe jacking machine. Preferably, two channels are provided in each edge blind zone, and the two channels are arranged side by side along the outline of the pipe jacking machine.

[0035] A method for blind zone treatment using the above-mentioned composite formation multi-cutterhead rectangular pipe jacking blind zone treatment structure includes the following steps:

[0036] S1. The pipe jacking machine is tunneling normally;

[0037] S2. When the pipe jacking machine encounters complex strata or even hard rock strata across the entire cross section and has to stop, the valve in channel 4 opens, and the drill-blast integrated treatment structure advances forward under the action of the drilling machine until the hole-reaming hammer touches the tunnel interface.

[0038] S3. The air compressor is turned on, providing high-pressure air to drive the impact rod 11 and the expanding hammer 12 to move, hammering the hard rock, breaking the hard rock into powder, and then blowing it out of the hole through the hole on the expanding hammer with high-pressure air.

[0039] S4. After the drilling module enters the predetermined depth, the heating tube inside the excitation tube is energized, and high temperature is generated instantly inside the excitation tube, which forces the liquid CO2 in the main tube to rapidly vaporize and generate high pressure, breaking through the sealing plate and rupture plate inside the extension tube 28. It is released from the energy release port 27 of the energy release tube through the main airflow pipe 25 and the branch airflow pipe 26, and acts on the surrounding hard rock, thereby generating many cracks inside the rock and fracturing the hard rock.

[0040] S5. Retract the integrated drilling and blasting treatment structure, close the valves in the passage, and the pipe jacking machine continues to excavate;

[0041] S6. Replace the extension pipe, fill it with liquid CO2, and prepare for blasting the hard rock in the next area.

[0042] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A composite formation multi-disc rectangular jacking pipe blind zone treatment structure, characterized in that: The system includes a drilling and blasting integrated processing structure. The direction of travel of the pipe jacking machine is defined as forward. The drilling and blasting integrated processing structure includes a drilling module (1) and a blasting module (2) connected sequentially from front to back. The rear end of the blasting module (2) is connected to the drilling machine through a transfer pipe (3). The cutterhead blind zone of the multi-cutterhead rectangular pipe jacking machine is provided with a channel (4) in the soil chamber. The drilling and blasting integrated processing structure is set in the channel (4). The channel (4) is provided with a valve on the side near the cutterhead. The drilling module (1) adopts a pneumatic impact hammer, including an impact rod (11) and a reaming hammer (12). The impact rod (11) is connected to an air compressor (13) through an air circuit. The air compressor (13) provides high-pressure air to drive the impact rod (11) and the reaming hammer (12) to move.

2. The composite formation multi-disc rectangular jacking pipe blind zone treatment structure according to claim 1, characterized in that: The blasting module (2) includes a liquid CO2 storage pipe (21) and an energy release pipe (22). The liquid CO2 storage pipe (21) includes a main body, the front end of which is connected to the energy release pipe (22), and the rear end is provided with a filling end (23). The main body is filled with liquid CO2 through the filling end (23). The main body is provided with an excitation pipe (24), which heats up to vaporize the liquid CO2. The energy release pipe (22) is provided with a main airflow pipe (25) and multiple branch airflow pipes (26) connected to the main airflow pipe (25). The branch airflow pipes (26) extend to the wall of the energy release pipe to form an energy release port (27). The rear end of the main airflow pipe (25) is connected to an extension pipe (28), which extends into the liquid CO2 storage pipe (21). The extension pipe (28) is provided with a sealing plate (29) and a rupture plate (30).

3. The composite formation multi-disc rectangular jacking pipe blind zone treatment structure according to claim 2, characterized in that: The excitation tube (24) contains a heating tube and a chemical agent. The heating tube provides heat for the chemical agent reaction. The main components of the chemical agent are potassium perchlorate, ammonium oxalate, and salicylic acid.

4. The composite formation multi-disc rectangular jacking pipe blind zone treatment structure according to claim 1, characterized in that: The cutterhead blind zone of the multi-cutterhead rectangular pipe jacking machine includes multiple independent central blind zones (51) and edge blind zones (52). For each blind zone, at least one channel for installing the integrated drilling and blasting treatment structure is provided. In the central blind zone, the channel is located in the center of the central blind zone (51). For the edge blind zone (52), the channel is located on the side of the edge blind zone (52) close to the outline of the pipe jacking machine.

5. The composite formation multi-disc rectangular jacking pipe blind zone treatment structure according to claim 4, characterized in that: Two channels are provided for each edge blind zone (52), and the two channels are arranged side by side along the outline of the pipe jacking machine.

6. A method for blind zone treatment using the composite formation multi-disc rectangular pipe jacking blind zone treatment structure according to any one of claims 1-5, comprising the following steps: S1: The pipe jacking machine is tunneling normally; S2. When the pipe jacking machine encounters a complex geological formation and stops, the valve in the tunnel opens, and the drilling and blasting integrated treatment structure advances forward under the action of the drilling machine until the hole-reaming hammer touches the tunnel interface. S3. The air compressor is turned on, providing high-pressure air to drive the impact rod and the expanding hammer head to move, hammering the hard rock, breaking the hard rock into powder, and then blowing it out of the hole through the hole on the expanding hammer head through the high-pressure air. S4. After the drilling module enters the predetermined depth, the heating tube inside the excitation tube is energized, and the excitation tube instantly generates high temperature, which forces the liquid CO2 in the main tube to rapidly vaporize and generate high pressure, breaking through the sealing plate and rupture plate in the extension tube. It is released from the energy release port of the energy release tube through the main air flow pipe and the branch air flow pipe, and acts on the surrounding hard rock, thereby generating many cracks inside the rock and fracturing the hard rock. S5. Retract the integrated drilling and blasting treatment structure, close the valves in the passage, and the pipe jacking machine continues to excavate; S6. Replace the extension pipe, fill it with liquid CO2, and prepare for blasting the hard rock in the next area.

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