A subway connecting channel excavation equipment and construction method based on horizontal full rotation

Abstract

The present invention relates to the field of tunnel construction technology, and in particular to a subway connecting channel excavation equipment and construction method based on horizontal full rotation (abbreviated as HTCJ method). A subway connecting channel equipment based on horizontal full rotation casing jacking, comprising a cutting unit, a machine head pipe, a steel pipe section, a rotary drive mechanism, a main pushing device, a sliding fixing device, a support mechanism and a sealing mechanism; the rotary drive mechanism is used to drive the machine head pipe or the steel pipe section to rotate and drive the cutting unit to circumferentially cut the pipe segment or the soil in front. The subway connecting channel excavation equipment based on horizontal full rotation and its construction method have the advantages of miniaturization of equipment, high cutting efficiency, low cost, small cutting area, small disturbance of soil excavation construction, controllable posture, high quality, and no pollution. It solves the problems of traditional mechanical method of subway connecting channel construction requiring special treatment of main tunnel segments, large cutting area, easy collapse and water and sand gushing, and difficult receiving posture control.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and in particular to a subway connecting channel excavation equipment and construction method based on horizontal full rotation (HTCJ method for short). Background Art

[0002] At present, the construction of connecting channels of ultra-large diameter shield tunnels mainly includes mining method, shield method and jacking method, while the ground reinforcement mainly includes grouting method and freezing method. The grouting + freezing method may cause ground instability and soil and water to flow into the tunnel. In addition, the spatial cross-structure type of excavation construction will also make the shield tunnel structure more unfavorable in stress, which will have a huge impact on the overall deformation and safety control of the structure.

[0003] Currently, there are many deficiencies in the tunneling equipment and construction methods for subway connecting passages. The equipment is expensive and the construction process is complicated.

[0004] In terms of excavation equipment, traditional mechanical methods such as shield method and pipe jacking method are currently widely used. The shield method has many mechanisms, complex and complicated structures, and requires a long and large space, which is limited by the cross-sectional space of the main tunnel and cannot be accommodated; the pipe jacking method has few mechanisms and requires a short space, but the cutterhead, tools and drive devices for full-section or annular surface excavation are all concentrated in the front section of the pipe jacking machine. The structure is complex and bulky, resulting in top-heavy, easy to fall over and deflect.

[0005] In terms of construction technology, the problems stem from improper construction methods, poor foundation reinforcement methods, or both. In particular, special pretreatment or segment design is required for the main tunnel segments, which is costly. The cutting of the main tunnel segments by the starting and receiving cutters involves a wide range, a long time, and a large surface area of ​​damage. Furthermore, the cut segments cannot be properly discharged and must be removed before the equipment reaches the soil. This exposes the soil outside the main tunnel, releasing water and soil pressure, leading to collapse and water and sand influx into the tunnel, causing ground subsidence and tunnel insecurity. Therefore, when removing the existing main tunnel segments, grouting or freezing methods are required to reinforce the soil at the entrance. This method relies heavily on the effectiveness of soil reinforcement, but the unknown and complex geological conditions make reinforcement quality uncontrollable. Furthermore, during the receiving process, the cutterhead makes point contact with the reverse arc surface of the segment, making it difficult to control its position, making it difficult to accurately position and effectively cut the receiving segment. Furthermore, when the receiving machine head receives the segments, the reserved steel box and portal ring beam are prone to misalignment, affecting the quality of tunnel construction.

[0006] In terms of cutting tools, the existing cutting tools are inefficient and take too long to grind shield segments, ground settlement is difficult to control, the posture of the cross channel is difficult to control, mechanical soil discharge is not smooth, pipe blockage, gushing, and the poor structural type of the opening part leads to risks such as segment rupture and structural leakage.

[0007] In summary, the traditional mechanical method has the following main problems: (1) The time required for full-section demolition and opening of the segments in the intersection area between the main tunnel and the connecting channel is long, the damage surface is large, and the embedded steel bars cannot be cut. Special treatment is required for the segments of the main tunnel near the connecting channel; (2) When breaking the existing segments of the main tunnel, grouting or freezing methods are required to reinforce the soil at the entrance. The degree of dependence on the soil reinforcement effect is high, but the unknown and complex geological conditions make the reinforcement quality uncontrollable; (3) When the equipment is close to the receiving end, the center point of the machine head contacts the anti-arc surface of the main tunnel segment, making it difficult to accurately position and effectively cut the segments at the receiving end, affecting the construction quality.

[0008] Therefore, the traditional mechanical method still has many shortcomings. It is necessary to develop new equipment and processes, study miniaturized equipment in confined spaces, reduce costs, increase efficiency, and ensure safety and environmental protection to meet the increasing construction needs of engineering projects. Summary of the Invention

[0009] In response to the problems raised in the prior art, the present invention aims to provide a horizontal, fully rotary subway tunnel excavation equipment. The equipment features a compact design, minimal space requirements, miniaturization, efficient cutting, low cost, environmentally friendly construction, low construction risk, safety, and high quality. The equipment comprises a cutting unit, a die pipe, a steel pipe segment, a rotary drive mechanism, a main thrust mechanism, a sliding fixture, a support mechanism, and a sealing mechanism. The rotary drive mechanism is used to rotate and propel the die pipe or steel pipe segment. The cutting unit is positioned at the front end of the die pipe. The die pipe drives and transmits thrust to the cutting unit, eliminating the need for a power source to rotate and provide penetration force into the soil. The die pipe and steel pipe segment form a protective wall. After excavation is complete, the soil within the steel pipe segment (casing) is removed via peripheral equipment. This equipment addresses the problems encountered in traditional mechanical methods for urban subway tunnel excavation, such as limited space, difficult equipment deployment, extensive full-section cutting that can significantly damage the main tunnel, the tendency for the die pipe to deviate from the reverse arc surface of the main tunnel segment during reception, uncontrollable reception posture, difficulty in ensuring quality, and high equipment manufacturing costs.

[0010] To achieve this object, the present invention adopts the following technical solutions:

[0011] A subway connecting channel excavation device based on horizontal full rotation includes a cutting unit, a machine head pipe, a steel pipe section, a rotary drive mechanism, a main push device, a sliding fixing device, a support mechanism and a sealing mechanism;

[0012] The cutting unit is circumferentially arranged at the front end of the machine head pipe and is used for cutting the main tunnel segments and the soil in front;

[0013] The cutting unit is circumferentially arranged at the front end of the die head pipe, and the rear end of the die head pipe is connected to the steel pipe section;

[0014] The steel pipe section is connected between the head pipe and the drive section;

[0015] The rotary drive mechanism is installed on the starting trolley in the main tunnel and can slide back and forth. A plurality of sliding fixing devices are provided on the top of the rotary drive mechanism. The sliding fixing devices are supported on the main tunnel segments. The rotary drive mechanism is connected to the driving section. The rotary drive mechanism is used to drive the head pipe or the steel pipe section to rotate and drive the cutting unit to circumferentially cut the segments or the soil in front.

[0016] The main pushing device is installed at the rear of the rotary drive mechanism, and is used to drive the rotary drive mechanism to move forward and backward;

[0017] The supporting mechanism is fixedly mounted on the departure trolley, the supporting mechanism is connected to the sealing mechanism, the sealing mechanism is stationary relative to the main tunnel, and the supporting mechanism is used to support the sealing mechanism;

[0018] The sealing mechanism is arranged in front of the rotary drive mechanism and is located inside the machine head tube or the steel pipe section. The sealing mechanism can rotate relative to the machine head tube or the steel pipe section. The sealing mechanism is used to form an in-tube seal inside the machine head tube or the steel pipe section.

[0019] To further illustrate, the rotary drive mechanism includes a main frame and a drive device arranged inside the main frame, the drive section is installed in the middle of the main frame and can move forward and backward, and the drive device is annularly connected to the drive section.

[0020] To further illustrate, the sliding fixing device includes a jack and a gripper shoe, the front end of the jack is connected to the bottom of the gripper shoe, and the top of the gripper shoe is supported on the main tunnel segment.

[0021] Further explanation: a rear leaning structure is provided between the main pushing device and the main tunnel segment; the main pushing device includes a plurality of main pushing cylinders; the cylinder bodies of the main pushing cylinders are fixed in the rotary drive mechanism; and the piston rods of the main pushing cylinders are supported against the rear leaning structure.

[0022] Further explaining, the sealing mechanism includes a sealing sleeve, a sealing capsule, a sealing structure, a backstop device and a sealing mechanism support;

[0023] The sealing bag is provided in front of the sealing sleeve, and the sealing bag can be filled with a flowing medium;

[0024] A plurality of sealing mechanism supports are provided at the rear of the sealing sleeve, and the sealing mechanism supports are connected to the supporting mechanism;

[0025] The sealing structure is provided on the outer periphery of the sealing sleeve, and the sealing structure is provided between the head pipe or the steel pipe joint and the sealing sleeve to form a seal inside the pipe;

[0026] Two groups of anti-retraction devices are provided in the annular direction of the sealing sleeve, and each group of anti-retraction devices is provided with a number of anti-retraction pins. The anti-retraction pins are fixedly connected to or detached from the machine head tube or the steel pipe section. When in a fixed connection state, they prevent the machine head tube or the steel pipe section from retreating, and when in a detached state, they do not hinder the machine head tube or the steel pipe section from being driven to rotate or push forward by the rotary drive mechanism.

[0027] To further illustrate, the support mechanism includes a support base, a support sleeve, a support shaft rod and a support cylinder;

[0028] The support shaft and the support oil cylinder are both arranged in the support shaft sleeve, one end of the support shaft is connected to the front end of the support oil cylinder, and the support oil cylinder drives the support shaft to extend to connect with the sealing mechanism support, or the support oil cylinder drives the support shaft to retract to disengage from the sealing mechanism support; when the rotary drive mechanism drives the machine head pipe or the steel pipe section to rotate and drives the cutting unit to circumferentially cut the pipe segment or the soil in front, the support shaft extends and connects to the sealing mechanism support to support the sealing mechanism; when the rotary drive mechanism stops driving and the steel pipe section is installed, the support shaft retracts and disengages from the sealing mechanism support;

[0029] The support sleeve is fixed to the support base, the support base is fixed to the starting trolley, the support base is located behind the rotary drive mechanism, and the support mechanism is arranged inside the drive section.

[0030] A construction method based on a horizontal full-rotation subway connecting tunnel excavation equipment is adopted, including tunnel entrance soil reinforcement, main tunnel segment reinforcement, starting tunnel portal fabrication and receiving tunnel portal fabrication, and further comprising the following steps:

[0031] S1. Horizontal full-rotation casing jacking construction:

[0032] S11. Equipment installation: moving the starting trolley to position the subway connecting channel excavation equipment based on horizontal full rotation and fix it in the main tunnel;

[0033] S12, initial excavation advancement stage: the sealing mechanism is installed inside the die head pipe, the main pushing device pushes the die head pipe with the cutting unit to align with the starting tunnel opening, and then extends the front end of the support mechanism to connect with the sealing mechanism support, then the rotary drive mechanism drives the drive section to rotate and drive the die head pipe and the cutting unit to circumferentially cut the main tunnel segment of the starting tunnel opening, the rotary drive mechanism stops driving, then the back-stop device is fixedly connected to the die head pipe, the steel pipe section is installed in the main tunnel and connected to the die head pipe;

[0034] S13, normal excavation stage: After the steel pipe segment is installed, the anti-retraction device is separated from the machine head pipe, and the rotary drive mechanism drives the drive segment to rotate, driving the steel pipe segment and the cutting unit to cut the soil in front of the tunnel opening in an annular groove. After the cutting and excavation completes a designed stroke, the rotary drive mechanism stops, and then the anti-retraction device is fixedly connected to the steel pipe segment. The steel pipe segment is installed in the main tunnel and connected to the machine head pipe. The above steps are repeated in a cycle, and the steel pipe segment is continuously driven and advanced until the cutting of the rock and soil in the connecting channel tunnel is completed;

[0035] S14, receiving and excavating stage: the cutting unit of the die head pipe circumferentially cuts the main tunnel segment at the receiving end, and then installs the steel pipe segment in the main tunnel at the starting end until the die head pipe is completely pushed into the receiving sleeve;

[0036] S2. Channel slag removal: After the steel pipe section is completely penetrated, the pipe segments and rock and soil in the steel pipe section channel are removed;

[0037] S3, jacking replacement:

[0038] S31, jacking device in place: in the main tunnel, first remove the other subway connecting channel excavation equipment based on horizontal full rotation except the steel pipe section, and install the jacking device in place;

[0039] S32, concrete pipe segment installation: installing the concrete pipe segment in sequence starting from the end of the steel pipe segment, and connecting the end of the steel pipe segment to the front end of the concrete pipe segment;

[0040] S33, jacking the concrete pipe segment: starting the jacking device, pushing the concrete pipe segment forward, jacking the concrete pipe segment from the starting end to the receiving end, until the steel pipe segment is completely replaced, forming a connecting channel, and recovering all the steel pipe segments;

[0041] S4. Portal treatment and back-grouting: construct the post-cast portal ring beam at the starting end and the post-cast portal ring beam at the receiving end and perform waterproofing treatment to connect the connecting channel and the main tunnel as a whole. Then, inject grouting liquid into the concrete pipe segment to effectively consolidate the pipe segment and the surrounding soil.

[0042] To further illustrate, the main tunnel segment reinforcement includes: using carbon fiber cloth to strengthen the segments within the main tunnel portal;

[0043] The production of the starting tunnel door includes: constructing a tunnel door wall and a sealing water-stopping device within the scope of the starting tunnel opening of the communication passage;

[0044] The production of the receiving tunnel door includes: constructing a tunnel door wall and a sealing water-stopping device within the receiving end tunnel range of the communication channel, and installing a receiving sleeve.

[0045] It is further explained that during the horizontal full-rotation cutting and tunneling construction in steps S12, S13 and S14, the following contents are also included: 1) the pipe segments and rock and soil after circumferential cutting are retained in the machine head pipe or the steel pipe section throughout the process; 2) grouting holes are reserved on the inner and outer sides of the machine head pipe and the steel pipe section, and lubricating and drag-reducing materials are pressurized into the inner and outer walls of the machine head pipe and the steel pipe section through a grouting device, and the grouting device is provided with a joint to prevent the grouting pipe from winding.

[0046] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0047] Compared with traditional mechanical excavation equipment, the greatest advantages of the subway connecting channel excavation equipment based on horizontal full rotation of the present invention are:

[0048] First, the horizontally fully revolving subway tunnel excavation equipment is characterized by miniaturization (simplified starting and receiving, as well as the starting trolley), mechanical construction, and fully enclosed operations, which provide high safety and stability.

[0049] Second, a cutting unit made of a specially made high-strength alloy is installed at the front end of the machine head tube. This unit can cut reinforced concrete segments in a circular pattern, allowing for the definition of cross passages at any location without requiring special segments to be reserved in the main tunnel. This minimizes damage to the main tunnel segments and increases construction safety. Traditional mechanical methods for constructing connecting passages require special segments to be reserved and cut across the entire cross-section, resulting in a large cutting area, significant damage to the main tunnel, and increased construction risk.

[0050] Third, annular cutting avoids cutting the entire segment, which not only improves cutting efficiency but also significantly reduces equipment manufacturing costs;

[0051] Fourth, horizontal full-rotation excavation involves excavating with soil throughout the entire process. This firstly reduces soil disturbance and allows for controlled settlement. Secondly, the soil plug effect created by excavating with soil helps reduce the impact of water and soil pressure at the tunnel face on the portal water-stop device and the rear rotary drive mechanism.

[0052] Fifth, grouting holes are reserved for the die head pipe and steel pipe section, and lubricant is injected into the pipe wall inside and outside during rotary cutting. Injecting lubricating slurry on the outside reduces the friction between the outer wall of the die head pipe and steel pipe section and the soil, as well as the cutting torque; injecting lubricating slurry on the inside reduces the friction between the inner wall of the die head pipe and steel pipe section and the soil, and at the same time reduces the moment of inertia of the internal soil on the die head pipe or steel pipe section when driving with soil;

[0053] Sixth, the full-rotation follow-up pipe jacking allows the cutting unit to cut the main tunnel pipe segment at the receiving end in an annular manner. The axis posture is controllable, enabling precise receiving. This avoids the situation in traditional mechanical methods where the machine head contacts the anti-arc surface of the main tunnel segment, resulting in inaccurate positioning and uncontrollable receiving posture.

[0054] Seventh, the sealing mechanism and support mechanism work together. After the main tunnel segments at the starting end are cut, they serve as the sealing and support structure of the tunnel entrance. There is no need to remove the segments, reducing the safety risks of water and sand gushing caused by external soil exposure and tunnel instability.

[0055] Eighth, the earthwork is cleared inside the steel pipe section, and reinforced concrete pipe sections are used to replace the steel pipe sections, so that the steel pipe sections can be reused and the cost is reduced;

[0056] The present invention also innovatively proposes a construction method using subway connecting channel excavation equipment based on horizontal full rotation. First, the cutting unit arranged on the full rotation machine head pipe is used to cut the main tunnel segment or the surrounding soil. The rotary drive mechanism drives the machine head pipe or steel pipe section to rotate. The cutting and rotation are carried out without soil discharge. In the initial stage, the steel pipe section forms the initial support of the connecting channel in the form of no soil discharge. Then, after cleaning the soil in the steel pipe section, the steel pipe section is replaced with a reinforced concrete pipe section. Finally, the portal ring beam is constructed to connect the channel and the main tunnel into a whole. The method has the advantages of small damage to the main tunnel, small disturbance to the surrounding soil, reduced ground subsidence risk, low dependence on soil reinforcement, controllable circumferential cutting receiving posture, high overall construction safety and high construction efficiency, and controllable quality. It solves the problems of low safety, high construction risk and uncontrollable quality in the traditional mechanical method of urban subway connecting channel construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 This is a schematic diagram of the initial layout structure of a subway connecting channel excavation equipment based on horizontal full rotation according to an embodiment of the present invention;

[0058] Figure 2 This is a front view of a rotary drive mechanism of a subway connecting channel excavation equipment based on horizontal full rotation according to one embodiment of the present invention;

[0059] Figure 3 This is a cross-sectional view of a rotary drive mechanism of a subway connecting channel excavation equipment based on horizontal full rotation according to one embodiment of the present invention;

[0060] Figure 4 This is a cross-sectional view of a sealing mechanism of a subway connecting channel excavation device based on a horizontal full-rotation method according to an embodiment of the present invention;

[0061] Figure 5 This is a cross-sectional view of a support mechanism of a subway connecting channel excavation device based on horizontal full rotation according to an embodiment of the present invention;

[0062] Figure 6 This is a cross-sectional view of a head pipe of a subway connecting channel excavation equipment based on horizontal full rotation according to one embodiment of the present invention;

[0063] Figure 7 This is a simplified process flow diagram of a construction method according to one embodiment of the present invention;

[0064] Figure 8 This is a schematic diagram of the initial excavation of a construction method according to one embodiment of the present invention;

[0065] Figure 9 Schematic diagram of normal excavation of a construction method according to an embodiment of the present invention;

[0066] Figure 10 This is a schematic diagram of receiving excavation of a construction method according to an embodiment of the present invention;

[0067] Figure 11 1. It is a schematic diagram of jacking and displacement of a construction method according to an embodiment of the present invention;

[0068] Figure 12 Schematic diagram of a construction method for forming a communication channel according to an embodiment of the present invention;

[0069] In the accompanying drawings: rotary drive mechanism 1, main frame 11, drive device 12, drive section 13, main push device 2, main push cylinder 21, sliding fixing device 3, jack 31, support shoe 32, sealing mechanism 4, sealing sleeve 41, sealing bag 42, medium injection pipeline 421, valve 422, sealing structure 43, sealing ring 431, wire brush 432, grease tube 433, stop pin 44, sealing mechanism support 45, support mechanism 5, support base 51, support sleeve 5 2. Support shaft 53, support cylinder 54, steel pipe section 6, machine head pipe 61, cutting unit 611, grouting hole 612, grouting channel 613, rear support structure 7, pipe section installation space 8, starting trolley 101, main tunnel segment 102, jacking device 103, main jacking device 1031, jacking iron 1032, concrete pipe section 104, post-casting tunnel gate ring beam 105, receiving trolley 106, starting tunnel gate ring beam 107, receiving tunnel gate ring beam 108, and receiving sleeve 109. DETAILED DESCRIPTION

[0070] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0071] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more such features, and are used to distinguish between the described features, without distinction of order or importance.

[0072] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0073] like Figures 1 to 12 As shown, a subway connecting channel excavation equipment based on horizontal full rotation includes a cutting unit 611, a head pipe 61, a steel pipe section 6, a rotary drive mechanism 1, a main pushing device 2, a sliding fixing device 3, a support mechanism 5 and a sealing mechanism 4;

[0074] The cutting unit 611 is circumferentially arranged at the front end of the machine head pipe 61 and is used to cut the main tunnel segment 102 and the soil in front;

[0075] The cutting unit 611 is circumferentially arranged at the front end of the head pipe 61, and the rear end of the head pipe 61 is connected to the steel pipe section 6;

[0076] The steel pipe section 6 is connected between the head pipe 61 and the drive section 13;

[0077] The rotary drive mechanism 1 is installed on the starting trolley 101 in the main tunnel and can slide back and forth. A plurality of sliding fixing devices 3 are provided on the top of the rotary drive mechanism 1. The sliding fixing devices 3 are supported on the main tunnel segments 102. The rotary drive mechanism 1 is connected to the driving section 13. The rotary drive mechanism 1 is used to drive the head pipe 61 or the steel pipe section 6 to rotate and drive the cutting unit 611 to circumferentially cut the segments or the soil in front.

[0078] The main pushing device 2 is installed at the rear of the rotary drive mechanism 1, and is used to drive the rotary drive mechanism 1 to move forward and backward;

[0079] The support mechanism 5 is fixedly mounted on the departure trolley 101 . The support mechanism 5 is connected to the sealing mechanism 4 . The sealing mechanism 4 is stationary relative to the main tunnel. The support mechanism 5 is used to support the sealing mechanism 4 .

[0080] The sealing mechanism 4 is arranged in front of the rotary drive mechanism 1 and is located inside the machine head tube 61 or the steel pipe section 6. The sealing mechanism 4 can rotate relative to the machine head tube 61 or the steel pipe section 6. The sealing mechanism 4 is used to form an in-tube seal inside the machine head tube 61 or the steel pipe section 6.

[0081] By setting the rotary drive mechanism 1, the rotary drive mechanism 1 is used to drive the machine head pipe 61 or the steel pipe section 6 to rotate and drive the cutting unit 611 to cut the main tunnel segment 102 or the soil in front in an annular direction, providing torque for the rotation of the machine head pipe 61 or the steel pipe section 6. Since the cutting unit 611 is provided at the front end of the machine head pipe 61, the cutting unit 611 can cut the reinforced concrete segment in an annular direction, and the connecting channel can be determined at any position without reserving special segments on the main tunnel. At the same time, the cutting unit 611 is used for cutting, which can greatly reduce the cutting area and cutting time. The width of the annular cutting of the tunnel structure can be controlled, avoiding full-section cutting of the segment, improving construction efficiency, and greatly reducing equipment costs. During the excavation process, the soil is excavated throughout the process, which can reduce soil disturbance. The movement, settlement is controllable, and the full rotation follows the pipe jacking, the axis posture is controllable, and the annular cutting of the concrete pipe segment of the main tunnel at the receiving end can realize accurate reception; in addition, by setting the supporting mechanism 5 and the sealing mechanism 4, the two work together, and after the main tunnel segment at the starting end is cut, it serves as a sealing structure and support structure of the cave entrance. There is no need to remove the segment in the initial stage, which reduces the safety risk of water and sand gushing and tunnel instability caused by external soil exposure. The subway connecting channel excavation equipment based on horizontal full rotation has the advantages of miniaturization, fully enclosed operation of mechanical construction, high safety and good stability. It can solve the construction technical problems of special treatment of the main tunnel segment during the construction of urban subway connecting channels using traditional mechanical methods, the inability to discharge the cut segments normally, easy collapse and water and sand gushing in the tunnel, and difficult to control the posture during reception.

[0082] Specifically, a sliding device is provided at the bottom of the rotary drive mechanism 1, and the sliding device is used to realize the sliding installation of the rotary drive mechanism 1 on the starting trolley 101, so that the rotary drive mechanism 1 is installed on the starting trolley 101 and can slide back and forth without longitudinal sliding and twisting. The sliding device can adopt an existing sliding device, such as the combination of a slide rail and a slider. Specifically, a guide rail is provided on the starting trolley 101, and the upper end of the guide rail is coated with lubricating material. The guide rail needs to be precisely positioned during installation.

[0083] To further explain, the rotary drive mechanism 1 includes a main frame 11 and a drive device 12 arranged inside the main frame 11. The drive section 13 is installed in the middle of the main frame 11 and can move forward and backward. The drive device 12 is circumferentially connected to the drive section 13.

[0084] By arranging the driving device 12 inside the main frame 11, specifically, the driving device 12 is driven by the rotary driving cylinder inside it and is connected to the external hydraulic system to drive the driving section 13 to rotate, the driving section 13 is the rotary transmission torque of the steel pipe section 6, the length of the driving section 13 is slightly larger than the lateral length of the rotary drive mechanism 1, the head tube 61 is the first steel pipe section, the front end of the head tube 61 is provided with a cutting unit 611, and the driving section 13 is arranged in the middle of the rotary drive mechanism 1, the rear end of the head tube 61 is provided with a joint, the front and rear ends of the steel pipe section 6 are provided with joints, and the front end of the driving section 13 is provided with a joint, the head tube 61 and the steel pipe section 6, the two steel pipe sections 6, and the steel pipe section 6 and the driving section 13 are all connected by fixed pins, and the connection stability is strong;

[0085] To further explain, the cutting unit 611 at the front end of the head tube 61 is specifically a tool, which is provided with cutting outer teeth, cutting middle teeth, and cutting inner teeth. The material of the tool is preferably existing high-strength alloy material, so that the tool has high strength, wear resistance, and strong cutting stability.

[0086] To further explain, the sliding fixing device 3 includes a jack 31 and a gripper shoe 32 . The front end of the jack 31 is connected to the bottom of the gripper shoe 32 , and the top of the gripper shoe 32 is supported on the main tunnel segment 102 .

[0087] By arranging the jack 31 and the support shoe 32 on the sliding fixing device 3, the jack 31 is extended and retracted so that the support shoe 32 supports or does not support the main tunnel segment 102, thereby playing a role in resisting torque, so as to achieve support for the forward and backward moving rotary drive mechanism 1 during the full-rotation excavation process, thereby ensuring the stability of the equipment during the excavation construction process.

[0088] To further explain, a rear leaning structure 7 is arranged between the main pushing device 2 and the main tunnel segment 102. The main pushing device 2 includes several main pushing cylinders 21. The cylinder body of the main pushing cylinder 21 is fixed in the rotary drive mechanism 1, and the piston rod of the main pushing cylinder 21 is supported by the rear leaning structure 7.

[0089] Specifically, during excavation, the main push cylinder 21 extends to move the slewing drive mechanism 1 forward to install the steel pipe segment 6. The main push cylinder 21 retracts to move the slewing drive mechanism 1 backward, so that a pipe segment installation space 8 is formed between the slewing drive mechanism 1 and the sealing mechanism 4, providing installation space for the steel pipe segment 6.

[0090] To further explain, the rear leaning structure 7 adopts an arc-shaped steel structure, and the rear leaning structure 7 is tightly fitted on the main tunnel segment 102 at the starting end. A buffer material is also provided between the rear leaning structure 7 and the main tunnel segment 102. The buffer material can use a rubber pad to prevent the main tunnel segment 102 from being damaged due to stress concentration.

[0091] Further, the sealing mechanism 4 includes a sealing sleeve 41, a sealing capsule 42, a sealing structure 43, a backstop device, and a sealing mechanism support 45; the sealing capsule 42 is provided in front of the sealing sleeve 41, and the sealing capsule 42 can be filled with a flowing medium; a plurality of sealing mechanism supports 45 are provided behind the sealing sleeve 41, and the sealing mechanism supports 45 are connected to the support mechanism 5;

[0092] The sealing structure 43 is provided on the outer periphery of the sealing sleeve 41, and the sealing structure 43 is provided between the head pipe 61 or the steel pipe section 6 and the sealing sleeve 41 to form a seal inside the pipe;

[0093] The sealing sleeve 41 is provided with two groups of anti-retraction devices in the annular direction, and each group of the anti-retraction devices is provided with a number of anti-retraction pins 44. The anti-retraction pins 44 are fixedly connected to or detached from the machine head tube 61 or the steel pipe section 6. When in a fixed connection state, they prevent the machine head tube 61 or the steel pipe section 6 from retreating, and when in a detached state, they do not hinder the machine head tube 61 or the steel pipe section 6 from being driven to rotate or push forward by the rotary drive mechanism 1.

[0094] Specifically, the sealing sleeve 41 is a cylindrical structure, the outer diameter of the sealing sleeve 41 is slightly smaller than the inner diameter of the machine head pipe 61 and the steel pipe section 6, and the sealing sleeve 41 is provided with a reinforcing member, such as a stiffening plate, inside the structure; the front end of the sealing sleeve 41 is provided with the sealing bag 42, and the sealing bag 42 is not filled with a fluid medium in the original state. The fluid medium is filled into the sealing bag 42 to support the main tunnel segment 102 (the segment to be cut within the scope of the portal) and the soil in front. The reason for providing the sealing bag 42 is that there is a certain distance between the main tunnel segment 102 and the sealing sleeve 41. If the portal segment is cut, the external soil pressure is large, and the soil pressure is released, resulting in the soil outside the portal generating Deformation may cause problems such as ground subsidence or tunnel instability; in particular, the sealing bag 42 is provided with a medium injection pipeline 421, which is used for grouting or air compression. The medium injection pipeline 421 passes through the sealing sleeve 41 and is provided with a valve 422; before excavation, the medium injection pipeline 421 is connected to an external grouting (or air compression) system, and a flow medium of a specified pressure is pressed into it according to the size of the soil pressure at the tunnel portal. The flow medium can be air, clean water, mud, etc. After the injected medium meets the requirements, the valve is closed, the injection is stopped, and the external grouting (or air compression) system is disconnected to complete the filling of the flow medium in the sealing bag 42;

[0095] Further explanation, the sealing structure 43 is provided between the steel pipe section 66 and the sealing sleeve 41, and is used to form a seal inside the pipe to play a waterproof role. The sealing structure 43 includes two sealing rings 431, a plurality of steel wire brushes 432 and a plurality of grease tubes 433. The sealing rings 431, the steel wire brushes 432 and the grease tubes 433 are all arranged along the circumference of the outer surface of the sealing sleeve 41; the sealing rings 431 are provided at the front and rear ends of the outer circumference of the sealing sleeve 41 to prevent excessive constraint. The steel pipe section 6 rotates, leaving a gap between the sealing sleeve 41 and the inner wall of the steel pipe section 6. This gap may pose a risk of water seepage. Therefore, the sealing ring 431 is provided in the gap to not only stop water but also act as a buffer between the sealing sleeve 41 and the machine head pipe 61 or the steel pipe section 6 to prevent direct friction between steel structures. The sealing ring 431 is preferably made of a material with a low friction coefficient or has a surface coated with a lubricating material. The wire brush 432 is provided in the middle of the outer periphery of the sealing sleeve 41.

[0096] Further explanation is given, the sealing sleeve 41 is provided with two groups of anti-retraction devices in the annular direction, and each group of the anti-retraction devices is provided with a number of anti-retraction pins 44, and the anti-retraction pins 44 are fixedly connected or detached from the machine head tube 61 or the steel pipe section 6. When in the fixed connection state, they prevent the machine head tube 61 or the steel pipe section 6 from retreating, and when in the detached state, they do not hinder the machine head tube 61 or the steel pipe section 6 from being driven to rotate or push forward by the rotary drive mechanism 1.

[0097] Specifically, the sealing mechanism support 45 is a circular or rectangular ring-shaped steel structure, which may be provided with bolt holes. The front end of the sealing mechanism support 45 is welded to the rear end face of the sealing sleeve 41, and the rear end of the sealing mechanism support 45 is an open structure. There are several sealing mechanism supports 45, specifically 2 to 4.

[0098] Preferably, the front end of the machine head pipe 61 is provided with three-way grouting holes 612, and the inner side of the pipe wall of the steel pipe section 6 and the outer side of the steel pipe section 6 are both provided with grouting holes 612. The machine head pipe 61 and the steel pipe section 6 are provided with a grouting channel 613, and the grouting channel 613 of the machine head pipe 61 is connected with the grouting channel 613 of the steel pipe section 6, and the grouting holes 612 are connected with the grouting channel 613. Grouting and lubricating material can be simultaneously performed on the cutting unit 611 of the machine head pipe 61, the inner side of the machine head pipe 61 and the outer side of the machine head pipe 61. In order to overcome the weight of the soil, horizontal rotary cutting has high requirements for torque and large power, and the soil is rotated to cut, and greater friction will be generated between the soil and the pipe section, which will increase the tool cutting torque and the burden of the full-rotation equipment. Grouting into the grouting holes 612 on the inner and outer sides of the machine head pipe 61 and the steel pipe section 6 has the effect of lubrication, drag reduction and temperature reduction. The purpose of grouting the front end of the cutting unit 611 is to cool the cutting unit 611 and lubricate the cutting. Since the cutting unit 611 continuously cuts the soil, the temperature of the cutting unit 611 itself will continue to rise. The temperature increase will affect the cutting function of the tool. Therefore, grouting liquid is required to cool the cutting unit 611, and environmentally friendly materials are preferably used for the slurry material. Specifically, the length of the machine head pipe 61 and the steel pipe section 6 is generally 0.8 to 1.5 meters, and the steel pipe section 6 is transported by a mobile trolley.

[0099] To further illustrate, the support mechanism 5 includes a support base 51, a support sleeve 52, a support shaft rod 53 and a support cylinder 54; the support shaft rod 53 and the support cylinder 54 are both arranged in the support sleeve 52, one end of the support shaft rod 53 is connected to the front end of the support cylinder 54, and the support cylinder 54 drives the support shaft rod 53 to extend to connect with the sealing mechanism support 45, or the support cylinder 54 retracts to drive the support shaft rod 53 to retract and disengage from the sealing mechanism support 45; when the rotary drive mechanism 1 drives the machine head pipe 61 or the steel pipe section 6 to rotate and drive the cutting unit 611 to circumferentially cut the pipe segment or the soil in front, the support shaft rod 53 extends and connects with the sealing mechanism support 45 to support the sealing mechanism 4; when the rotary drive mechanism 1 stops driving and the steel pipe section 6 is installed, the support shaft rod 53 retracts and disengages from the sealing mechanism support 45;

[0100] The support sleeve 52 is fixed to the support base 51 , and the support base 51 is fixed to the starting trolley 101 . The support base 51 is located behind the rotary drive mechanism 1 , and the support mechanism 5 is disposed inside the drive section 13 .

[0101] Specifically, the support oil cylinder 54 is hydraulically driven, thereby driving the support shaft 53 to be inserted into the sealing mechanism support 45 and connected to the sealing mechanism support 45, or to be separated from the sealing mechanism support 45, and the driving stability is good;

[0102] It is further explained that during the horizontal full-rotation excavation process, the sealing mechanism 4 supports the steel pipe section 6 and the soil, and does not rotate with the steel pipe section 6. The support mechanism 5 has the functions of supporting, resisting a certain degree of torque and being retractable. The support oil cylinder 54 is provided to drive the support shaft 53 to retract so that the other end of the support shaft 53 is connected to or detached from the sealing mechanism support 45. In addition, instead of using direct support from the oil cylinder, the support sleeve 52 and the support base 51 are added. In order to ensure the installation space requirements of the steel pipe section 6, the length of the support mechanism 5 can be appropriately increased and the stability can be improved. The support sleeve 52 is completely fixed to the support base 51, and the support base 51 is fixed to the starting trolley 101. The support mechanism 5 is arranged inside the drive section 13 (specifically, it is arranged in the internal space of the drive section 13, forming a spatial arrangement with the rotary drive mechanism 1), and the support mechanism 5 and the drive section 13 do not affect each other, thereby ensuring support stability.

[0103] Further, the support shaft 53 is fixedly connected to the piston rod of the support cylinder 54, and other structures can be provided between the support shaft 53 and the support sleeve 52 so that the support shaft 53 can provide a certain ability to resist torsion;

[0104] Specifically, 2 to 4 support sleeves 52 may be provided on the support base 51. When 2 support sleeves 52 are provided, they may be arranged on the left and right. When 3 or 4 support sleeves 52 are provided, they may be arranged in two layers.

[0105] Preferably, before the steel pipe section 6 is installed, the steel pipe section 6 is first clamped by the anti-retraction device on the outside of the steel pipe section 6 to prevent the steel pipe section 6 from retreating, and the anti-retraction pin 44 is pushed out and inserted into the positioning hole on the inside of the steel pipe section 6 to prevent the steel pipe section 6 from retreating; after the steel pipe section 6 is installed, the support shaft 53 is connected to the sealing mechanism support 45 of the sealing mechanism 4 and fixedly connected, and then the anti-retraction pin 44 is withdrawn. After the support shaft 53 is extended, it can be fixedly connected to the sealing mechanism support 45 with fasteners (such as bolts) to enhance the connection stability between the support shaft 53 and the sealing mechanism support 45.

[0106] Specifically, the external retaining device of the steel pipe section 6 is installed near the launch tunnel ring beam 107 and can be pneumatic, hydraulic, or mechanical. Furthermore, the hydraulic drive system, grouting (or air compression) system, electrical control system, and slag discharge system are all installed on a plurality of mobile trolleys.

[0107] A construction method based on a horizontal full-rotation subway connecting tunnel excavation equipment is adopted, including the following steps: reinforcing the soil at the tunnel entrance, reinforcing the main tunnel segment 102, fabricating the starting tunnel portal and the receiving tunnel portal:

[0108] S1. Horizontal full-rotation casing jacking construction:

[0109] S11, equipment installation: moving the starting trolley 101, placing the subway connecting channel excavation equipment based on horizontal full rotation in place, and fixing it in the main tunnel;

[0110] S12, initial excavation advancement stage: the sealing mechanism 4 is installed inside the machine head tube 61, the main pushing device 2 pushes the machine head tube 61 with the cutting unit 611 to align with the starting tunnel opening, and then extends the front end of the supporting mechanism 5 to connect with the sealing mechanism support 45, then the rotary drive mechanism 1 drives the driving section 13 to rotate and drive the machine head tube 61 and the cutting unit 611 to circumferentially cut the main tunnel segment 102 of the starting tunnel opening, the rotary drive mechanism 1 stops driving, then the back-stop device is fixedly connected to the machine head tube 61, the steel pipe section 6 is installed in the main tunnel and connected to the machine head tube 61;

[0111] S13, normal excavation stage: After the steel pipe segment 6 is installed, the anti-retraction device is separated from the machine head pipe 61, and the rotary drive mechanism 1 drives the drive segment 13 to rotate and drive the steel pipe segment 6 and the cutting unit 611 to cut the soil in front of the tunnel opening in an annular groove. After the cutting and excavation completes a designed stroke, the rotary drive mechanism 1 stops. Then, the anti-retraction device is fixedly connected to the steel pipe segment 6, and the steel pipe segment 6 is installed in the main tunnel and connected to the machine head pipe 61. The above steps are repeated in a cycle, and the steel pipe segment 6 is continuously driven and advanced until the cutting of the rock and soil in the connecting channel tunnel is completed;

[0112] S14, receiving excavation stage: the cutting unit 611 of the head pipe 61 circumferentially cuts the main tunnel segment 102 at the receiving end, and then installs the steel pipe segment 6 in the main tunnel at the starting end until the head pipe 61 is completely pushed into the receiving sleeve 109;

[0113] S2, channel slag removal: After the steel pipe section 6 is completely penetrated, the pipe segments and rock and soil in the channel of the steel pipe section 6 are removed;

[0114] S3, jacking replacement:

[0115] S31, the jacking device 103 is put in place: in the main tunnel, first remove the other subway connecting channel excavation equipment based on horizontal full rotation except the steel pipe section 6, and install the jacking device 103 in place;

[0116] S32, installation of the concrete pipe segment 104: installing the concrete pipe segment 104 starting from the end of the steel pipe segment 6 in sequence, and connecting the end of the steel pipe segment 6 to the front end of the concrete pipe segment 104;

[0117] S33, jacking the concrete pipe segment 104: start the jacking device 103, push the concrete pipe segment 104 forward, and jack the concrete pipe segment 104 from the starting end to the receiving end until the steel pipe segment 6 is completely replaced, forming a connecting channel, and all the steel pipe segments 6 are recovered;

[0118] S4. Portal treatment and back-grouting: The post-casting portal ring beam 105 at the starting end and the post-casting portal ring beam 105 at the receiving end are respectively constructed and waterproofed to connect the connecting passage and the main tunnel as a whole. Then, grouting liquid is pressurized into the concrete pipe segment 104 to effectively consolidate the pipe segment and the surrounding soil.

[0119] Specifically, the sealing mechanism 4 is first installed inside the machine head pipe 61, and then installed on the guide rail together with the machine head pipe 61. The supporting mechanism 5 is connected to the sealing mechanism 4 and supports and fixes it. The main pushing device 2 and the rotary drive mechanism 1 are started to push the machine head pipe 61 to cut part of the pipe segment of the main tunnel at the starting end. After stopping the cutting, the supporting mechanism 5 is released to move the rotary drive mechanism 1 backward, and then the steel pipe section 6 is installed to enable the machine head pipe 61 to cut and excavate the main tunnel pipe segment 102 and the reinforced soil at the starting end. The first section of the steel pipe section is the machine head pipe 61. A cutting unit 611 made of high-strength alloy material is installed at the front end of the machine head pipe 61. The cutting unit 611 has a certain amount of over-excavation inside and outside the steel pipe section 6.

[0120] In particular, except for the machine head pipe 61 and the steel pipe section 6 connected to the machine head pipe 61, the remaining steel pipe sections 6 need to be equipped with an external anti-retreat device on the starting tunnel ring beam 107 to connect the pushed-in steel pipe section 6 before installation, and the sealing mechanism 4 needs to be fixed to the inside of the pushed-in steel pipe section 6 through the anti-retreat pin 44 first, and the external anti-retreat device and the anti-retreat pin 44 are released after the steel pipe section 6 is installed; specifically, when installing the machine head pipe 61 and the steel pipe section 6 connected to the first section, it is not necessary to push out the anti-retreat pin 44, but the supporting mechanism 5 needs to be used to connect the sealing mechanism 4 to support the soil pressure transmitted from the soil in front. When installing the second section of the steel pipe section 6, in order to ensure space for installing the steel pipe section, the support shaft 53 of the support mechanism 5 is retracted, which is equivalent to the withdrawal of the horizontal support force. Since the machine head pipe 61 enters the soil, the soil pressure in front is relatively large. In order to resist the soil pressure, the steel pipe section 6 and the sealing mechanism 4 that have been pushed in must be stopped. The sealing mechanism 4 transfers the soil pressure to the pushed in steel pipe section 6 through the stop pin 44. The pushed in steel pipe section 6 transfers the pressure to the portal and the main tunnel through the external stop device.

[0121] Specifically, during the excavation construction at step S12, the front end of the die head pipe 61 is lifted up by 10 to 20 mm, and then the die head pipe 61 is pushed forward to cut the main tunnel segment 102 at the starting end opening.

[0122] It should be noted that the jacking device 103 at least includes a main jacking device 1031 and a jacking iron 1032. The jacking device 103 is the same as the rear supporting equipment of the conventional pipe jacking method. The only difference is that since the cross channel has been excavated, there is no need to use a jacking machine for secondary excavation. It is only necessary to drive the concrete pipe section 104 forward by the main jacking cylinder and replace the steel pipe section 6. Specifically, all concrete pipe sections 104 are connected by sockets. In particular, before installing the first section of the concrete pipe section 104, a temporary steel socket is welded at the tail end of the steel pipe section 6 of the last section.

[0123] The construction method of the present invention uses the subway connecting channel excavation equipment based on horizontal full rotation, which mainly includes two parts: full rotation excavation and jacking replacement, and has the following advantages:

[0124] (1) An innovative method for constructing a subway connecting channel based on full-rotation tunneling and jacking replacement is proposed. First, full-rotation tunneling is used to cut the main tunnel segment 102 and the original soil. The steel pipe segment 6 is used as the primary support. After the steel pipe segment 6 is penetrated, the slag is removed. Then, the concrete pipe segment 104 is jacked in to replace the steel pipe segment 6. After the tunnel door is sealed and the wall is reinforced by grouting, the connecting channel construction is completed.

[0125] (2) Compared with the existing mechanical method for constructing the connecting channel, the greatest features of the present invention are: first, the method adopts the method of excavation without soil discharge, with less over-excavation and less disturbance to the overlying soil, thus reducing the risk of ground subsidence; second, the sealing mechanism 4 and the supporting mechanism 5 cooperate with each other, and after the main tunnel segment 102 at the starting end is cut, it serves as the supporting structure and sealing structure of the tunnel entrance, thereby improving the construction safety; third, the whole-process circumferential cutting and soil excavation construction has a low degree of dependence on the soil reinforcement effect.

[0126] (3) This method can directly cut the original rock and soil, and has strong adaptability to the formation;

[0127] (4) This method avoids the inaccurate contact and positioning between the head of the equipment and the anti-arc surface of the main tunnel segment in the traditional mechanical method. The circumferential cutting method makes the receiving positioning more accurate, the damage to the main tunnel surface is smaller, the process is simple, and the safety and quality are more controllable.

[0128] To further explain, the reinforcement of the main tunnel segment 102 includes: using carbon fiber cloth to strengthen the segment in the main tunnel portal range; the production of the starting portal includes: constructing a portal wall and a sealing water-stopping device in the portal range of the starting end of the connecting channel; the production of the receiving portal includes: constructing a portal wall and a sealing water-stopping device in the portal range of the receiving end of the connecting channel, and installing a receiving sleeve 109.

[0129] Specifically, lubricating material can be applied to the guide rails of the departure trolley 101 to ensure smooth operation of the equipment. In particular, the arrangement in the main tunnel is also included: guide rails are laid on the departure trolley 101 and the receiving trolley 106, and a backrest structure 7 is installed behind the departure trolley 101.

[0130] Specifically, during the production of the starting tunnel portal, a starting tunnel portal ring beam 107 is installed at the starting end of the communication channel, and a sealing and water-stopping device at the starting end is installed. In particular, the sealing and water-stopping device at the starting end can use an existing water-stopping device. The sealing and water-stopping device at the starting end can be composed of two wire brushes and a rubber curtain, and is provided with a grease pipe. When cutting the pipe segment, grease is injected into the gap between the steel pipe section 6 and the starting tunnel portal through the grease pipe in the sealing and water-stopping device at the starting end for sealing and water-stopping.

[0131] Specifically, in the production of the receiving tunnel portal, a receiving tunnel portal ring beam 108 is installed at the receiving end of the connecting channel, and a sealing and water-stopping device, a receiving sleeve 109 and an anti-support frame are installed at the receiving end. The sealing and water-stopping device at the receiving end can use an existing water-stopping device. The sealing and water-stopping device at the receiving end can be composed of a wire brush and provided with a grease tube. After the head tube 61 is pushed into the receiving sleeve 109, grease is immediately injected into the gap between the steel pipe section and the receiving tunnel portal through the sealing and water-stopping device at the receiving end and the grease tube on the receiving sleeve 109 for sealing and water-stopping; a detachable hatch is provided at the end of the receiving sleeve 109, and several wire brushes and a grease tube are provided inside; in particular, the anti-support frame can be temporarily supported on the hatch of the main tunnel segment 102 and the receiving sleeve 109 at the receiving end.

[0132] It is further explained that during the horizontal full-rotation cutting and tunneling construction in steps S12, S13 and S14, the following contents are also included: 1) the pipe segments and rock and soil after circumferential cutting are retained in the machine head pipe 61 or the steel pipe section 6 throughout the process; 2) grouting holes 612 are reserved on the inner and outer sides of the machine head pipe 61 and the steel pipe section 6, and lubricating and drag-reducing materials are pressurized into the inner and outer walls of the machine head pipe 61 and the steel pipe section 6 through a grouting device, and the grouting device is provided with a joint to prevent the grouting pipe from winding.

[0133] Further, grouting holes 612 are reserved on the inner and outer sides of the die pipe 61 and the steel pipe section 6. Lubricating material is injected into the grouting holes 612 by a grouting device. After the injection is stopped, the rotary drive mechanism 1 is started to drive the drive section 13 to rotate and drive the die pipe 61 and the cutting unit 611 to cut and excavate in a circumferential direction. During the excavation process, the friction resistance between the die pipe or the steel pipe section and the soil and the rotary torque of the die pipe are reduced.

[0134] Specifically, the diameter of the grouting channel 613 is less than half the wall thickness of the die head tube 61 or the steel pipe section 6. A plurality of grouting holes 612 are evenly arranged along the circumference of the die head tube 61 or the steel pipe section 6. Sealing members are provided at the ends of the grouting holes 612. Specifically, when stopping the grouting, it is necessary to first empty the grouting holes 612 for a period of time to allow the lubricating material in the grouting holes 612 to be completely drained before disconnecting the grouting device.

[0135] In particular, during the jacking replacement of the concrete pipe segment 104 in step S33, grease needs to be injected into the holes at the starting and receiving ends for sealing and water stopping. The jacking replacement process also includes the step of jacking resistance reduction: a number of grouting holes are provided in the circumference of the concrete pipe segment 104, and a grouting pipe is installed inside. During the jacking process, drag-reducing mud is injected into the outside of the concrete pipe segment 104 along the grouting pipe through the grouting device to reduce the jacking friction resistance.

[0136] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A subway connecting channel excavation equipment based on horizontal full rotation, characterized in that: It includes a cutting unit, a head pipe, a steel pipe section, a rotary drive mechanism, a main push device, a sliding fixing device, a supporting mechanism and a sealing mechanism; The cutting unit is circumferentially arranged at the front end of the machine head pipe and is used for cutting the main tunnel segments and the soil in front; The cutting unit is circumferentially arranged at the front end of the die head pipe, and the rear end of the die head pipe is connected to the steel pipe section; The steel pipe section is connected between the head pipe and the drive section; The rotary drive mechanism is installed on the starting trolley in the main tunnel and can slide back and forth. A plurality of sliding fixing devices are provided on the top of the rotary drive mechanism. The sliding fixing devices are supported on the main tunnel segments. The rotary drive mechanism is connected to the driving section. The rotary drive mechanism is used to drive the head pipe or the steel pipe section to rotate and drive the cutting unit to circumferentially cut the segments or the soil in front. The main pushing device is installed at the rear of the rotary drive mechanism, and is used to drive the rotary drive mechanism to move forward and backward; The supporting mechanism is fixedly mounted on the departure trolley, the supporting mechanism is connected to the sealing mechanism, the sealing mechanism is stationary relative to the main tunnel, and the supporting mechanism is used to support the sealing mechanism; The sealing mechanism is arranged in front of the rotary drive mechanism and is located inside the handpiece tube or the steel pipe section. The sealing mechanism can rotate relative to the handpiece tube or the steel pipe section and is used to form an inner tube seal inside the handpiece tube or the steel pipe section. The sealing mechanism includes a sealing structure, a sealing sleeve, a backstop device, and a sealing bag; the sealing bag is provided in front of the sealing sleeve and can be filled with a fluid medium; the fluid medium is filled into the sealing bag so that it supports the main tunnel segment and the soil in front; The sealing structure is provided on the outer periphery of the sealing sleeve, and the sealing structure is provided between the head pipe or the steel pipe joint and the sealing sleeve to form a seal inside the pipe; Two groups of anti-retraction devices are provided in the annular direction of the sealing sleeve, and each group of anti-retraction devices is provided with a number of anti-retraction pins. The anti-retraction pins are fixedly connected to or detached from the machine head tube or the steel pipe section. When in a fixed connection state, they prevent the machine head tube or the steel pipe section from retreating, and when in a detached state, they do not hinder the machine head tube or the steel pipe section from being driven to rotate or push forward by the rotary drive mechanism.

2. The subway connecting channel excavation equipment based on horizontal full rotation according to claim 1 is characterized in that: The rotary drive mechanism includes a main frame and a drive device arranged inside the main frame. The drive section is installed in the middle of the main frame and can move forward and backward. The drive device is annularly connected to the drive section.

3. The subway connecting channel excavation equipment based on horizontal full rotation according to claim 1 is characterized in that: The sliding fixing device includes a jack and a gripper shoe. The front end of the jack is connected to the bottom of the gripper shoe, and the top of the gripper shoe is supported on the main tunnel segment.

4. The subway connecting channel excavation equipment based on horizontal full rotation according to claim 1 is characterized in that: A backrest structure is provided between the main pushing device and the main tunnel segment. The main pushing device includes a plurality of main pushing cylinders. The cylinder bodies of the main pushing cylinders are fixed in the rotary drive mechanism, and the piston rods of the main pushing cylinders are supported in the backrest structure.

5. The subway connecting channel excavation equipment based on horizontal full rotation according to claim 1 is characterized in that: The sealing mechanism includes a sealing mechanism support; A plurality of sealing mechanism supports are provided at the rear of the sealing sleeve, and the sealing mechanism supports are connected to the supporting mechanism.

6. The subway connecting channel excavation equipment based on horizontal full rotation according to claim 5 is characterized in that: The support mechanism includes a support base, a support sleeve, a support shaft rod and a support oil cylinder; The support shaft and the support oil cylinder are both arranged in the support shaft sleeve, one end of the support shaft is connected to the front end of the support oil cylinder, and the support oil cylinder drives the support shaft to extend to connect with the sealing mechanism support, or the support oil cylinder drives the support shaft to retract to disengage from the sealing mechanism support; when the rotary drive mechanism drives the machine head pipe or the steel pipe section to rotate and drives the cutting unit to circumferentially cut the pipe segment or the soil in front, the support shaft extends and connects to the sealing mechanism support to support the sealing mechanism; when the rotary drive mechanism stops driving and the steel pipe section is installed, the support shaft retracts and disengages from the sealing mechanism support; The support sleeve is fixed to the support base, the support base is fixed to the starting trolley, the support base is located behind the rotary drive mechanism, and the support mechanism is arranged inside the drive section.

7. A construction method for a subway connecting tunnel excavation device based on a horizontal full-turn structure as claimed in claim 1, comprising: reinforcing the soil at the tunnel entrance, reinforcing the main tunnel segments, fabricating the starting tunnel portal, and fabricating the receiving tunnel portal, characterized in that: The following steps are also included: S1. Horizontal full-rotation casing jacking construction: S11. Equipment installation: moving the starting trolley to position the subway connecting channel excavation equipment based on horizontal full rotation and fix it in the main tunnel; S12, initial excavation advancement stage: the sealing mechanism is installed inside the die head pipe, the main pushing device pushes the die head pipe with the cutting unit to align with the starting tunnel opening, and then extends the front end of the support mechanism to connect with the sealing mechanism support, then the rotary drive mechanism drives the drive section to rotate and drive the die head pipe and the cutting unit to circumferentially cut the main tunnel segment of the starting tunnel opening, the rotary drive mechanism stops driving, then the back-stop device is fixedly connected to the die head pipe, the steel pipe section is installed in the main tunnel and connected to the die head pipe; S13, normal excavation stage: After the steel pipe segment is installed, the anti-retraction device is separated from the machine head pipe, and the rotary drive mechanism drives the drive segment to rotate, driving the steel pipe segment and the cutting unit to cut the soil in front of the tunnel opening in an annular groove. After the cutting and excavation completes a designed stroke, the rotary drive mechanism stops, and then the anti-retraction device is fixedly connected to the steel pipe segment. The steel pipe segment is installed in the main tunnel and connected to the machine head pipe. The above steps are repeated in a cycle, and the steel pipe segment is continuously driven and advanced until the cutting of the rock and soil in the connecting channel tunnel is completed; S14, receiving and excavation stage: the cutting unit of the die head pipe circumferentially cuts the main tunnel segment at the receiving end, and then installs the steel pipe segment in the main tunnel at the starting end until the die head pipe is completely pushed into the receiving sleeve at the receiving end; S2. Channel slag removal: After the steel pipe section is completely penetrated, the pipe segments and rock and soil in the steel pipe section channel are removed; S3, jacking replacement: S31, jacking device in place: in the main tunnel, first remove the other subway connecting channel excavation equipment based on horizontal full rotation except the steel pipe section, and install the jacking device in place; S32, concrete pipe segment installation: installing the concrete pipe segment in sequence starting from the end of the steel pipe segment, and connecting the end of the steel pipe segment to the front end of the concrete pipe segment; S33, jacking the concrete pipe segment: starting the jacking device, pushing the concrete pipe segment forward, jacking the concrete pipe segment from the starting end to the receiving end, until the steel pipe segment is completely replaced, forming a connecting channel, and recovering all the steel pipe segments; S4. Portal treatment and back-grouting: construct the post-cast portal ring beam at the starting end and the post-cast portal ring beam at the receiving end and perform waterproofing treatment to connect the connecting channel and the main tunnel as a whole. Then, inject grouting liquid into the concrete pipe segment to effectively consolidate the pipe segment and the surrounding soil.

8. The construction method according to claim 7, characterized in that: The main tunnel segment reinforcement includes: using carbon fiber cloth to strengthen the segments within the main tunnel portal; The production of the starting tunnel door includes: constructing a tunnel door wall and a sealing water-stopping device within the scope of the starting tunnel opening of the communication passage; The production of the receiving tunnel door includes: constructing a tunnel door wall and a sealing and water-stopping device within the receiving end tunnel opening range of the communication channel, and installing the receiving sleeve.

9. The construction method according to claim 7, characterized in that: The process of performing horizontal full-rotation cutting and excavation construction in steps S12, S13 and S14 also includes the following: 1) The pipe segments and rock and soil after circumferential cutting are retained in the machine head pipe or the steel pipe section throughout the entire process; 2) Grouting holes are reserved on the inner and outer sides of the machine head pipe and the steel pipe section, and lubricating and drag-reducing materials are pressure-injected into the inner and outer walls of the machine head pipe and the steel pipe section through a grouting device, and the grouting device is provided with a joint to prevent the grouting pipe from winding.

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