Combined rectangular jacking pipe device and method

Abstract

The application belongs to the technical field of underground tunnel construction, and discloses a combined rectangular pipe jacking device and method. The device is used for decomposing an ultra-large-section tunnel into a plurality of pipe jacking units which can be spliced or disassembled, and combining the pipe jacking units to form a rectangular whole machine structure. The device is used for realizing alternate guiding and positioning and relative sliding through a guiding sliding groove device between adjacent units, and is used for sequentially advancing the pipe jacking units through independent jacking cylinders of the pipe jacking units according to a preset sequence. The device overcomes the defects of the traditional scheme, such as high cost, poor adaptability, difficult construction cooperation, low waterproof reliability and insufficient structural rigidity, in an economical, safe and efficient manner, and meets the construction demand of the ultra-large-section underground space in a complex stratum.

Description

Technical Field

[0001] This invention belongs to the field of underground tunnel construction technology, and particularly relates to a combined rectangular pipe jacking device and method. Background Technology

[0002] In the field of urban underground space construction, pipe jacking technology is widely used in various projects such as underground tunnels and integrated utility tunnels due to its characteristics of minimal disturbance to the surrounding environment and high construction efficiency. Among them, rectangular pipe jacking machines, with their advantage of being able to directly excavate rectangular tunnels, have a higher space utilization rate compared to circular tunnels, effectively saving underground space resources. They also have significant economic benefits and minimal impact on surrounding buildings and municipal pipelines, making them an important construction equipment in underground space construction. Currently, the industry generally defines rectangular pipe jacking machines with a cross-section length or width exceeding 10 meters as ultra-large cross-section pipe jacking machines. The demand for such pipe jacking machines in large-scale underground passages, subway stations, and other ultra-large cross-section underground space construction projects is becoming increasingly urgent, making it a research and application hotspot in the current underground engineering field.

[0003] Currently, traditional ultra-large cross-section tunnel construction mainly employs two mainstream technical solutions, both of which have significant problems and drawbacks. The first solution involves using a single large-diameter pipe jacking or shield tunneling machine. While this solution can complete ultra-large cross-section excavation with a single piece of equipment, the manufacturing and transportation costs of such equipment are extremely high, and its adaptability to geological conditions is limited, making it difficult to adapt to the complex and varied geological environments underground in cities. Furthermore, the enormous size of the equipment presents practical challenges during construction, such as inconvenient hoisting and difficult turning, further increasing the difficulty and cost of construction organization. The second solution involves dividing the large cross-section into multiple smaller cross-sections and using small pipe jacking machines to excavate them one by one. While this solution reduces equipment costs, it suffers from slow construction speed and high construction risks. The coordinated operation of multiple small pipe jacking machines is also challenging and prone to construction deviations. In addition, the waterproofing reliability of the joints at the junctions of multiple cross-sections is insufficient, easily leading to leakage risks. Moreover, the overall structural rigidity of the divided cross-sections is insufficient, failing to meet the structural safety requirements of ultra-large cross-section underground spaces and making it difficult to adapt to the construction needs of large underground passages with three or more lanes.

[0004] It is evident that existing technologies lack a reasonable construction method and equipment, and there is an urgent need to solve the technical problem of how to achieve alternating construction and rigid connection of combined rectangular pipe jacking, so as to ensure the completion of ultra-large cross-section underground space construction in an economical, safe and efficient manner. Summary of the Invention

[0005] This invention provides a combined rectangular pipe jacking device and method. Using this device, it is possible to achieve combined rectangular pipe jacking with alternating construction and rigid connection, ensuring the completion of ultra-large cross-section underground space construction in an economical, safe and efficient manner.

[0006] To achieve the above objectives, the present invention employs the following technical content: A modular rectangular pipe jacking device includes several pipe jacking units that can be added or removed and spliced ​​together; All pipe jacking units are spliced ​​together to form a rectangular overall structure that is compatible with the tunnel cross-section; Two adjacent pipe jacking units are connected by a guide and connecting slide device 1-3, which is used to realize the alternating guiding positioning and relative sliding between the pipe jacking units; The jacking unit is divided into a central jacking unit 3 located at the center of the rectangular structure, an edge jacking unit 2 located at the edge, and a corner jacking unit 1 located at the top corner. The contact edge dimensions of each jacking unit are matched. Each jacking unit is connected to a pipe segment 4 at its jacking end; the pipe segment 4 is provided with a guide slide 4-3; the guide slide 4-3 is located in the extension direction of the guide and connection slide device 1-3 of the corresponding jacking unit; adjacent guide slide 4-3 and adjacent guide slide 4-3 and guide and connection slide device 1-3 respectively form a cooperation to compensate for the alternating guidance positioning and relative sliding between jacking units in the cyclic jacking process; Each pipe segment 4 is paired with an independently propelled jacking cylinder 5, which can drive the corresponding jacking unit to complete the jacking operation in sequence according to a preset order.

[0007] Furthermore, a guide and connecting groove device 1-3 is provided on each of the two side contact surfaces and the top and bottom contact surfaces of the central jacking unit 3; Each of the three contact surfaces of the edge jacking unit 2 is provided with a guide and connecting slide device 1-3; Each of the two contact surfaces of the apex corner pipe unit 1 is provided with a guide and connecting slide groove device 1-3; The guiding and connecting slide device 1-3 includes a guide rail 1-3-3 and a slide 1-3-1 for guiding and connecting, and rollers 1-3-2 for relative sliding. Two adjacent jacking units are slidably connected to the slide groove 1-3-1 via guide rail 1-3-3. The roller 1-3-2 is embedded in the upper and lower sides of the slide groove 1-3-1 and can form a sliding fit with the guide rail 1-3-3. A dustproof scraper 1-3-4 is provided on the slide groove 1-3-1 and at the connection with the guide rail 1-3-3.

[0008] Furthermore, the rollers 1-3-2 are made of stainless steel and have built-in self-lubricating bearings; The dustproof scrapers 1-3-4 are made of wear-resistant rubber. A controllable gap is provided between the guide rail 1-3-3 and the slide groove 1-3-1.

[0009] Furthermore, the segment 4 also includes an L-shaped prestressed concrete member 4-1 and a slab-shaped prestressed concrete member 4-2 connected to each other. The L-shaped prestressed concrete member 4-1 and the slab-shaped prestressed concrete member 4-2 are connected by a CT socket member 4-1-1. The segment 4 is circumferentially connected to the jacking unit by a self-locking sawtooth thread insertion device 4-4. The jacking units are connected to each other by a guide groove member 4-3. The guide chute component 4-3 is longitudinally connected between two L-shaped prestressed concrete components 4-1 by connecting steel bars 4-3-1.

[0010] Furthermore, the segment 4 also includes a sealing gasket 4-5, which is disposed on the outer ring of the L-shaped prestressed concrete member 4-1.

[0011] Furthermore, the pipe jacking unit includes a casing 1-1 for the pipe jacking machine and a cutter head 1-2 disposed within the casing; The diameter of the cutterhead 1-2 is smaller than the outer contour of the jacking unit.

[0012] Furthermore, the contact edges of the central pipe jacking unit 3, the edge pipe jacking unit 2, and the apex corner pipe jacking unit 1 are of equal length.

[0013] A method for constructing a combined rectangular pipe jacking device, comprising: The central jacking unit 3 is pushed in by the jacking cylinder 5; Pipe segment 4 is spliced ​​at the jacking end of the central pipe jacking unit 3; The guide and connecting chute device 1-3 and the guide chute component 4-3 push the multiple edge jacking units 2 adjacent to the central jacking unit 3 along a predetermined path; Splice pipe segments 4 at the jacking ends of each edge jacking unit 2; The guide and connecting chute device 1-3 and the guide chute component 4-3 push the corner jacking unit 1 at the corner along a predetermined path; Pipe segments 4 are spliced ​​at the jacking ends of each corner jacking unit 1 to form a combined rectangular jacking device.

[0014] A method for constructing a combined rectangular pipe jacking device, comprising: The edge jacking unit 2 located in the first row is pushed in by the jacking cylinder 5; Splice pipe segment 4 at the jacking end of edge jacking unit 2; The guide and connecting chute device 1-3 and the guide chute component 4-3 push the corner jacking unit 1 adjacent to the edge jacking unit 2 along a predetermined path; At the jacking end of each corner jacking unit 1, pipe segments 4 are spliced ​​together; The guide and connecting chute device 1-3 and the guide chute component 4-3 push multiple jacking units located in the second row adjacent to the first row along a predetermined path; The jacking units are advanced row by row until the last row is reached. The pipe segments 4 corresponding to the last row of jacking units are connected to form a combined rectangular jacking device.

[0015] A construction method for a combined rectangular pipe jacking device includes: Based on the above construction method of the combined rectangular pipe jacking device, a combined rectangular pipe jacking device is formed to complete the first stage of jacking operation; Precast pipe sections are assembled one by one behind the starting well, and each pipe jacking unit alternates and cycles to carry out the next stage of jacking operation until all pipe jacking units reach the receiving well.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a modular rectangular pipe jacking device. It decomposes ultra-large cross-section tunnels into multiple modular pipe jacking units that can be added or removed and assembled to form a rectangular overall structure. A guide chute device between adjacent units enables alternating guidance, positioning, and relative sliding. Each unit is then advanced sequentially by its independent jacking cylinders in a preset order. This modular design avoids the high cost and transportation difficulties of single large-scale equipment, improving geological adaptability. The guide chute system, in conjunction with the guide components on the tunnel segments, ensures precise positioning and rigid connection between units during cyclic jacking, effectively compensating for construction deviations. The independent jacking mechanism enables alternating unit operations, improving collaborative efficiency and construction flexibility. This device overcomes the shortcomings of traditional solutions—expensive equipment, poor adaptability, difficult construction coordination, low waterproofing reliability, and insufficient structural rigidity—in an economical, safe, and efficient manner, meeting the construction requirements of ultra-large cross-section underground spaces in complex geological formations.

[0017] This invention also provides a construction method for a combined rectangular pipe jacking device. This method involves sequentially jacking the central, edge, and corner pipe jacking units and then splicing corresponding pipe segments to form a combined rectangular pipe jacking device. Using the central unit as the construction benchmark, this method utilizes a guide chute system to guide adjacent units to precisely connect and rigidly join along a predetermined path. Modular expansion is achieved through cyclical alternating jacking. This method effectively integrates the flexibility of modular design with the precision control of the guide system, avoiding the high cost and geological adaptability limitations of single large-diameter equipment, while overcoming the difficulties in coordinating construction across multiple small cross-sections, poor joint waterproofing, and insufficient structural rigidity. Thus, it completes the construction of ultra-large cross-section underground spaces in an economical, safe, and efficient manner.

[0018] Furthermore, this invention also provides a construction method for a combined rectangular pipe jacking device. Starting from one edge unit, the method proceeds row by row towards the other side, splicing pipe sections to ultimately form a complete combined rectangular pipe jacking device. This method uses a guide chute system to ensure precise docking and rigid connection of each row of units along a predetermined path, achieving modular construction through orderly, progressive expansion. This sequential construction logic effectively utilizes the structure of the previously completed rows as a guide and support benchmark for subsequent construction. It inherits the economic and geological adaptability advantages of modular design while overcoming the shortcomings of traditional multi-section schemes—slow construction speed, poor coordination, weak joint waterproofing, and insufficient structural rigidity—by strictly controlling the coordination accuracy of row-by-row advancement. Therefore, it provides a reliable method for the safe, efficient, and economical construction of ultra-large cross-section underground spaces.

[0019] This invention also provides a construction method for a combined rectangular pipe jacking device. Based on the aforementioned construction method for the combined rectangular pipe jacking device, this construction method first forms an initial combined rectangular pipe jacking device and completes the first stage of jacking. Subsequently, prefabricated pipe sections are assembled section by section behind the launching shaft to provide reaction force for each jacking unit, and each unit is directed to alternately and cyclically perform subsequent stages of jacking operations in a preset sequence until the entire device reaches the receiving shaft. This method decomposes long-distance jacking into multiple controllable cyclical stages, utilizes prefabricated pipe sections to provide continuous support, and ensures precise positioning and rigid connection during the alternation process through a guiding system. This method comprehensively solves the problems of high cost and poor flexibility of single large-diameter equipment, as well as difficulties in coordinating construction of multiple small cross-sections and loose structure. It achieves economy, safety, and efficiency in the construction of ultra-large cross-section tunnels through a modular and cyclical operation mode. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of a combined rectangular jacking pipe device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the jacking unit structure provided in an embodiment of the present invention; Figure 3 An enlarged view of the guiding and connecting slide device provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the segment structure provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the assembly structure of the L-shaped prestressed concrete component and the slab-shaped prestressed concrete component provided in the embodiments of the present invention; Figure 6 An enlarged view of the guide groove component in the tunnel segment provided in an embodiment of the present invention; Figure 7This is a construction flowchart of a combined rectangular pipe jacking device provided in an embodiment of the present invention; wherein (a)-(f) correspond to the structure of the combined rectangular pipe jacking device in each construction step; (e) is a rear view of (d).

[0021] Figure label: 1. Top corner pipe jacking unit; 1-1. Pipe jacking machine housing; 1-2. Cutter head; 1-3. Guide and connecting chute device; 1-3-1. Chute; 1-3-2. Roller; 1-3-3. Guide rail; 1-3-4. Dustproof scraper; 2. Edge jacking unit; 3. Center jacking unit; 4. Segment; 4-1. L-shaped prestressed concrete member; 4-2. Plate-shaped prestressed concrete member; 4-3. Guide groove member; 4-4. Self-locking sawtooth thread insertion device; 4-5. Sealing gasket; 4-1-1. CT socket member; 4-3-1. Connecting reinforcement; 5. Push cylinder. Detailed Implementation

[0022] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] As mentioned in the background section, traditional ultra-large cross-section tunnel construction often employs a single large-diameter pipe jacking machine or shield machine. These machines are expensive to manufacture and transport, have limited adaptability to geological conditions, and their massive size presents challenges such as inconvenient hoisting and difficult turning. Dividing the large cross-section into multiple smaller sections and using smaller pipe jacking machines to advance them one by one not only results in slow construction speed and high construction risks, but also presents problems such as difficulties in multi-machine coordination, unreliable joint waterproofing, and insufficient overall structural rigidity.

[0027] To address the aforementioned issues, this embodiment provides a modular rectangular pipe jacking device. This device enables alternating construction and rigid connection of modular rectangular pipe jacking, ensuring the completion of ultra-large cross-section underground space construction in an economical, safe, and efficient manner.

[0028] For example, this embodiment provides a combined rectangular pipe jacking device, which can be detachably connected to form an arbitrary rectangular cross-section through several pipe jacking units. The pipe jacking unit includes a shell 1 of the pipe jacking machine with a rectangular outer contour in orthographic projection and a cutter head 2 with a circular orthographic projection. Guide and connecting slide devices 1-3 are provided between adjacent pipe jacking units to realize alternating guided connection and sliding between pipe jacking units. The specific structure is as follows: This modular rectangular pipe jacking device comprises several jacking units that can be added or removed and spliced ​​together. All jacking units are spliced ​​to form a rectangular overall structure adapted to the tunnel cross-section. Adjacent jacking units are connected by guide and connecting slide devices 1-3, which are used to achieve alternating guidance, positioning, and relative sliding between the jacking units. Each jacking unit is divided into a central jacking unit 3 located at the center of the rectangular overall structure, edge jacking units 2 located at the edges, and corner jacking units 1 located at the apex. The contact edge dimensions of each jacking unit are matched. Each jacking end is connected to a pipe segment 4; the pipe segment 4 is provided with a guide slide 4-3; the guide slide 4-3 is located in the extension direction of the guide and connection slide device 1-3 of the corresponding jacking unit; two adjacent guide slide 4-3 and adjacent guide slide 4-3 and guide and connection slide device 1-3 respectively form a cooperation to compensate for the alternating guidance positioning and relative sliding between jacking units in the cyclic jacking process; each pipe segment 4 is respectively cooperated with an independently advancing jacking cylinder 5, which can drive the corresponding jacking unit to complete the jacking operation in sequence according to a preset order.

[0029] Furthermore, it should be noted that compared to existing modular cutterhead pipe jacking structures, modular cutterhead pipe jacking presents significant challenges in manufacturing, transporting, and assembling ultra-large cross-sections. It also lacks a guiding sliding structure, leading to issues such as uneven loading during jacking, significant ground disturbance, and difficulty in axis control. Consequently, there is no relative movement between units, no guiding structure, uneven stress on the ultra-large cross-section during overall jacking, significant uneven loading effects, large ground disturbance, and a high risk of tunnel axis misalignment. During assembly, the lack of guidance results in extremely poor alignment accuracy. This device employs a guiding sliding connection + modular segments + alternating jacking scheme, completely solving the aforementioned problems.

[0030] The combined rectangular pipe jacking device provided in this embodiment will be described in detail below with reference to the accompanying drawings: like Figure 1As shown, this embodiment provides a combined rectangular pipe jacking device, including several jacking units that can be added or removed and spliced ​​together. All jacking units are spliced ​​together to form a rectangular whole structure adapted to the tunnel cross-section. Adjacent jacking units are connected by guide and connecting slide devices 1-3, which are used to realize alternating guidance and positioning and relative sliding between jacking units. The jacking unit is divided into a central jacking unit 3 located at the center of the rectangular whole structure, an edge jacking unit 2 located at the edge, and a corner jacking unit 1 located at the apex. The contact edge dimensions of each jacking unit are matched. Each jacking unit's jacking end is connected to a pipe segment 4. A guide slide component 4-3 is provided on the pipe segment 4. The guide slide component 4-3 is located in the extension direction of the guide and connecting slide device 1-3 of the corresponding jacking unit. Adjacent guide slide components 4-3 and adjacent guide slide components 4-3 are connected to the guide and connecting slide device 1-3. The components 1-3 are coordinated to compensate for the alternating guidance and relative sliding between the pipe jacking units during the cyclic jacking process. Each pipe segment 4 is coordinated with an independently advancing jacking cylinder 5, enabling the corresponding pipe jacking unit to complete the jacking operation sequentially according to a preset order. This can be explained by disassembling the pipe jacking device into different types of pipe jacking units that can be added or removed, allowing for flexible adaptation to tunnel construction needs of different sizes and cross-sectional requirements. This solves the problems of traditional pipe jacking devices, such as inflexible cross-sectional size adjustment and poor versatility. The coordination between the guide and connecting chute devices 1-3 and the guide chute components 4-3 on the pipe segment 4 effectively compensates for the relative displacement between the pipe jacking units during the jacking process, ensuring the stability and guiding accuracy of the jacking process. The independently advancing jacking cylinder 5 enables the orderly jacking of each pipe jacking unit, allowing for flexible jacking operations with different cross-sections, improving construction efficiency and quality. The device can be connected by the guide and connecting chute devices 1-3 to form rectangular cross-sections of any shape and size. For example, each rectangular pipe jacking unit measures 4.5m × 3m. Arranging three rectangular pipe jacking units in each direction (one central pipe jacking unit, four corner pipe jacking units, and four edge pipe jacking units) can form a 13.5m × 9m cross-section. Arranging four rectangular pipe jacking units horizontally, and then three corner pipe jacking units horizontally, can form an 18m × 9m cross-section. Corner pipe jacking unit 1, edge pipe jacking unit 2, and central pipe jacking unit 3 can be changed to other sizes according to project needs, such as 3m × 2m or 3m × 3m, all using the above assembly method.

[0031] In this embodiment, as Figure 3As shown, a guide and connecting chute device 1-3 is provided on each of the two side contact surfaces and the top and bottom contact surfaces of the central jacking unit 3; a guide and connecting chute device 1-3 is provided on each of the three side contact surfaces of the edge jacking unit 2; and a guide and connecting chute device 1-3 is provided on each of the two side contact surfaces of the corner jacking unit 1. The guide and connecting chute device 1-3 includes a guide rail 1-3-3 and a chute 1-3-1 for guiding and connecting, and rollers 1-3-2 for relative sliding. Adjacent jacking units are connected by the guide rail 1-3-3 and the chute. 1-3-1 Sliding connection, rollers 1-3-2 are embedded in the upper and lower sides of the slide groove 1-3-1, and can form a sliding fit with the guide rail 1-3-3; a dustproof scraper 1-3-4 is provided on the slide groove 1-3-1 and at the connection with the guide rail 1-3-3; specifically, according to the position characteristics of different jacking units, a corresponding number of guiding and connecting slide groove devices 1-3 are set to ensure that each jacking unit can achieve stable guidance and connection. The central jacking unit 3 is equipped with this device on all four sides, which can form a reliable connection with the surrounding edge jacking units 2. The edge jacking unit 2 has this device on three sides, which can connect to the adjacent central jacking unit 3 and corner jacking unit 1. The corner jacking unit 1 has this device on two sides, which can connect to the two adjacent edge jacking units 2. That is, the central jacking unit 3 has four guide and connecting slide devices on its four sides, the edge jacking unit 2 has three guide and connecting slide devices with one smooth side, and the corner jacking unit 1 has two guide and connecting slide devices with two smooth sides, ensuring the integrity of the entire rectangular machine structure; guide rails 1-3 The cooperation between -3 and the chute 1-3-1 enables precise guidance between the jacking units. The setting of roller 1-3-2 can effectively reduce the friction when the jacking units slide relative to each other, avoid jamming, and ensure smooth jacking process. The dustproof scraper 1-3-4 can prevent mud and sand from entering the gap between the chute 1-3-1 and the guide rail 1-3-3 during construction, avoid wear on the guide rail 1-3-3 and roller 1-3-2, extend the service life of the guiding and connecting chute device 1-3, and ensure long-term stable operation of the device.

[0032] As another preferred embodiment, the roller 1-3-2 is made of stainless steel and has a built-in self-lubricating bearing, the dust scraper 1-3-4 is made of wear-resistant rubber, and a controllable gap is provided between the guide rail 1-3-3 and the slide groove 1-3-1. It can be explained that the stainless steel roller 1-3-2 has good corrosion resistance and wear resistance, making it suitable for harsh construction environments such as underground mud and water. The built-in self-lubricating bearing can further reduce sliding friction, reduce maintenance frequency, and lower construction costs. The wear-resistant rubber dust scraper 1-3-4 not only has good dustproof effect but also adapts to the relative sliding between the guide rail 1-3-3 and the slide groove 1-3-1, avoiding scratching the guide rail 1-3-3. At the same time, its excellent wear resistance extends its service life. The controllable gap between the guide rail 1-3-3 and the slide groove 1-3-1 ensures guiding accuracy, prevents excessive gap from causing the jacking unit to shift, and provides compensation space for the relative sliding between jacking units and slight deformation during construction, preventing jamming and improving the adaptability of the device.

[0033] In this embodiment, as Figure 4 and Figure 5 As shown, segment 4 also includes connected L-shaped prestressed concrete members 4-1 and slab-shaped prestressed concrete members 4-2. The L-shaped prestressed concrete members 4-1 and slab-shaped prestressed concrete members 4-2 are connected via CT socket members 4-1-1. Segment 4 is circumferentially connected to the jacking unit via a self-locking sawtooth threaded insertion device 4-4. The jacking units are connected via guide groove members 4-3. Guide groove members 4-3 are longitudinally connected between two L-shaped prestressed concrete members 4-1 via connecting steel bars 4-3-1. Specifically, the L-shaped prestressed concrete members 4-1... The design of the combination of prestressed concrete member 4-1 and slab-shaped prestressed concrete member 4-2 can adapt to the shape requirements of different types of jacking units. The connection via CT socket member 4-1-1 enables rapid positioning and reliable connection between components, improving the assembly efficiency and integrity of segment 4. The self-locking sawtooth thread insertion device 4-4 makes the connection between segment 4 and the jacking unit more secure, achieving self-locking under the jacking force to prevent loosening and ensure synchronous movement of segment 4 and the jacking unit during the jacking process. Figure 6 As shown, the guide chute component 4-3 is longitudinally connected between two L-shaped prestressed concrete components 4-1 by connecting steel bars 4-3-1, which can enhance the stability and load-bearing capacity of the guide chute component 4-3, ensure that it can effectively cooperate with the guide and connecting chute device 1-3 to realize the guiding compensation between the pipe jacking units, and at the same time realize the docking and positioning between the pipe jacking units, thus ensuring the structural stability of the entire pipe jacking device.

[0034] As another preferred embodiment, the segment 4 also includes a sealing gasket 4-5, which is disposed on the outer ring of the L-shaped prestressed concrete member 4-1. It can be explained that the sealing gasket 4-5 can effectively enhance the sealing between segments 4 and between segments 4 and the jacking unit, preventing underground mud and water from seeping into the tunnel through the connection gap, avoiding affecting the tunnel construction quality and later use safety. At the same time, it can reduce the collision and wear between segments 4 and extend the service life of segments 4. When the sealing gasket 4-5 is made of EPDM rubber, its aging resistance, corrosion resistance and sealing performance are better, and it can adapt to the complex underground construction environment.

[0035] In this embodiment, as Figure 2 As shown, the pipe jacking unit includes a casing 1-1 of the pipe jacking machine and a cutterhead 1-2 housed inside the casing. The diameter of the cutterhead 1-2 is smaller than the outer contour of the pipe jacking unit. Specifically, the casing 1-1 provides structural support and protection for the pipe jacking unit, ensuring that the pipe jacking unit can withstand the pressure of the underground soil during the jacking process. The cutterhead 1-2 is used to cut the soil in front, opening a path for the jacking of the pipe jacking unit. The diameter of the cutterhead 1-2 is smaller than the outer contour of the pipe jacking unit, which can avoid friction between the cutterhead 1-2 and the tunnel wall during the cutting of the soil. At the same time, it can reserve a certain space for the adjustment of the pipe jacking unit, prevent the cutterhead 1-2 from wearing or being damaged, and ensure cutting efficiency and smooth jacking.

[0036] As another preferred embodiment, the contact edges of the central jacking unit 3, the edge jacking unit 2, and the corner jacking unit 1 are of equal length. This means that the equal length of the contact edges of each jacking unit ensures a more regular connection between adjacent jacking units, avoiding problems such as uneven connection gaps and concentrated stress. It also ensures continuous and uniform stress transfer between jacking units, improving the stability and load-bearing capacity of the entire rectangular structure. Furthermore, it facilitates standardized production and assembly of jacking units, reducing production and construction costs. Finally, it ensures precise connection between the guide and connecting chute devices 1-3, guaranteeing guiding accuracy.

[0037] In this embodiment, a method for constructing a combined rectangular pipe jacking device is also provided. This method includes: alternating jacking operations of a corner jacking unit 1, an edge jacking unit 2, and a central jacking unit 3. For example, with three rectangular jacking units in each of the horizontal and vertical directions, each unit being 6m × 4m, the central jacking unit 3 is first jacked up by a jacking cylinder 5 to a predetermined length of 20-50m. A guide and connecting chute device 1-3 is pre-installed on the outer wall of the unit. This device is specially designed to adapt to underground muddy environments and high precision requirements. The guide rail 1-3-3 and the chute 1-3-1 have a 0.5-2mm gap design to ensure guiding accuracy while allowing for slight adjustments. The roller 1-3-2 reduces friction and prevents jamming, and the dust scraper 1-3-4 prevents mud and sand from entering, ensuring long-term reliability. After the central pipe jacking unit 3 is jacked up, the corresponding pipe segments 4 are assembled. Subsequently, the four edge pipe jacking units 2 adjacent to the central pipe jacking unit 3 are directly jacked up. During jacking, the guide and connecting chute devices 1-3 of each unit are precisely aligned and embedded, guiding the subsequent units along a predetermined path, forming a temporary mechanical lock, and the corresponding pipe segments 4 are assembled. Finally, the remaining four corner pipe jacking units 1 are installed at the four corners of the starting shaft. The guide rails 1-3-3 on the two adjacent sidewalls of each corner pipe jacking unit 1 are respectively embedded in the chute 1-3-1 of the two adjacent units already in place, achieving bidirectional guidance and positioning. Jacking up the central unit first forms core support, and the lateral friction force of subsequent units can be transferred to the central unit through the guide chute, preventing single-machine deflection. The corner units are jacked up last, pressing the units on both sides together to eliminate accumulated gaps, and then the corresponding pipe segments are assembled. After the nine units complete the first jacking, the entire jacking process is alternately cyclical until all units reach the receiving shaft. Specifically, this construction method follows the principle of "center first, edge follow-up, and corner finishing." The central jacking unit 3 is jacked first to form a core support structure, providing a stable guiding benchmark for the subsequent jacking of the edge jacking units 2 and the corner jacking unit 1, preventing deviation during the jacking of subsequent units. The cooperation between the guiding and connecting chute device 1-3 and the guiding chute component 4-3 ensures that each jacking unit is accurately jacked along a predetermined path, achieving precise docking between jacking units. After each jacking unit is jacked, the pipe segment 4 is promptly spliced ​​to fix and support the jacked unit, preventing rebound or deviation, while enhancing the overall integrity of the device. This construction method is simple and orderly to operate, effectively improving the construction efficiency and quality of the combined rectangular jacking device, and adapting to the construction requirements of tunnel cross-sections of different sizes.

[0038] As another preferred embodiment, a method for constructing a combined rectangular pipe jacking device is also provided. This method includes: first, initiating the jacking of the middle edge pipe jacking unit 2 of the first row, jacking it to a predetermined length of 20-50m; then continuing to jack the two adjacent corner pipe jacking units 1 to a predetermined length of 20-50m. After the first row of three rectangular pipe jacking units is completed, a good support effect is achieved. The second row of three rectangular pipe jacking units is then jacked, followed by the bottom row of three units. During the jacking process, the guide rail 1-3-3 of each jacking unit is embedded in the sliding groove 1-3-1 of the adjacent jacking unit, forming a temporary mechanical lock, ensuring the relative positional accuracy between adjacent units. After all nine units have completed the first stage of jacking, prefabricated pipe sections are assembled section by section behind the starting shaft. Each pipe jacking unit alternates and cycles through the next stage of jacking operations until all units reach the receiving shaft. Explained, this construction method employs a "row-by-row jacking" approach, first jacking the first row of edge jacking units 2 and adjacent corner jacking units 1, which can quickly form a phased support structure, providing a safety guarantee for the jacking of subsequent jacking units, and is especially suitable for construction sections with good geological conditions; during the row-by-row jacking process, the cooperation between the guide and connecting slide device 1-3 and the guide slide component 4-3 ensures precise docking and guidance between each row of jacking units, and the timely splicing of pipe segments 4 after each row of jacking is completed can enhance the support effect, prevent soil collapse, and ensure the structural stability of the entire device. This method can flexibly adapt to different arrangements of jacking unit combinations, further improving the applicability of the combined rectangular jacking device.

[0039] like Figure 7 As shown, specifically as follows Figure 7In the above, (a) to (h) refer to steps one through seven, i.e., completing the device construction process, and (h) refers to step one in a new cycle. This embodiment also provides a construction method for a combined rectangular pipe jacking device, including: forming a combined rectangular pipe jacking device based on any of the above construction methods to complete the first stage of jacking operation; assembling prefabricated pipe sections one by one behind the starting well, with each pipe jacking unit alternately and cyclically performing the next stage of jacking operation until all pipe jacking units reach the receiving well; specifically, the first stage forms a complete combined rectangular pipe jacking device through the construction method. The device lays the foundation for subsequent cyclic jacking operations, ensuring the continuity and stability of the jacking work. Precast pipe sections are assembled section by section behind the launching shaft, enabling parallel jacking and pipe section assembly operations, effectively improving construction efficiency. Each jacking unit alternates and cycles through jacking, and the jacking speed and force of each unit can be adjusted in a timely manner through independent control of the jacking cylinder 5, ensuring the entire jacking device advances along the predetermined path until all jacking units reach the receiving shaft, completing tunnel construction. This construction method is reasonable, efficient, and effectively reduces construction difficulty and costs, while improving the safety and quality of tunnel construction.

[0040] In summary, compared with existing pipe jacking structures, the combined rectangular pipe jacking device provided by this invention has the following advantages: First, this invention employs the principles of segmentation, local mass, pre-action, nesting, pre-reaction, compensation, composite materials, and combination to divide the planned ultra-large cross-section into several standard medium-sized rectangular pipe jacking units. These units are advanced one by one through alternating jacking. Using a standard medium-sized rectangular pipe jacking machine, there is no need to customize ultra-large equipment, significantly reducing manufacturing, transportation, and maintenance costs. Secondly, the invention adopts an alternating jacking strategy to avoid the problem of simultaneous construction of multiple machines. The failure of a single jacking unit does not affect the overall project, making construction flexible and risk-dispersed.

[0041] Third, the present invention ensures precise positioning and temporary stability between the jacking pipes through the guide chute device, and the final prestressed concrete and steel structure hybrid pipe segments provide high-strength permanent connection and waterproof sealing.

[0042] Fourth, the present invention can flexibly increase or decrease the number of jacking units according to the size and cross-section, and is suitable for various cross-sectional shapes and sizes, with strong adaptability.

[0043] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A combined rectangular pipe jacking device, characterized in that, It includes several jacking pipe units that can be added, removed, or spliced ​​together; All pipe jacking units are spliced ​​together to form a rectangular overall structure that is compatible with the tunnel cross-section; Two adjacent pipe jacking units are connected by a guide and connecting slide device (1-3), which is used to realize the alternating guiding positioning and relative sliding between the pipe jacking units; The jacking unit is divided into a central jacking unit (3) located at the center of the rectangular whole structure, an edge jacking unit (2) located at the edge, and a corner jacking unit (1) located at the top corner. The contact edge dimensions of each jacking unit are matched. Each jacking unit is connected to a pipe segment (4) at its jacking end; a guide chute component (4-3) is provided on the pipe segment (4); the guide chute component (4-3) is located in the extension direction of the guide and connection chute device (1-3) of the corresponding jacking unit; two adjacent guide chute components (4-3) and the adjacent guide chute component (4-3) and the guide and connection chute device (1-3) respectively form a cooperation to compensate for the alternating guidance positioning and relative sliding between jacking units in the cyclic jacking process; Each pipe segment (4) is paired with an independently propelled jacking cylinder (5) to drive the corresponding jacking unit to complete the jacking operation in sequence according to a preset order.

2. A combined rectangular pipe jacking device according to claim 1, characterized in that, The central jacking unit (3) is provided with a guide and connecting slide device (1-3) on each of the contact surfaces on both sides and the top and bottom contact surfaces. The edge jacking unit (2) is provided with a guide and connecting slide device (1-3) on each of its three contact surfaces. Each of the two contact surfaces of the apex corner pipe unit (1) is provided with a guide and connecting slide groove device (1-3); The guiding and connecting chute device (1-3) includes a guide rail (1-3-3) and a chute (1-3-1) for guiding and connecting, and rollers (1-3-2) for relative sliding. Two adjacent jacking units are slidably connected by a guide rail (1-3-3) and a slide groove (1-3-1). The roller (1-3-2) is embedded in the upper and lower sides of the slide groove (1-3-1) and can form a sliding fit with the guide rail (1-3-3). A dust scraper (1-3-4) is provided on the slide groove (1-3-1) and at the connection with the guide rail (1-3-3).

3. A combined rectangular pipe jacking device according to claim 2, characterized in that, The rollers (1-3-2) are made of stainless steel and have built-in self-lubricating bearings; The dust scraper (1-3-4) is made of wear-resistant rubber. A controllable gap is provided between the guide rail (1-3-3) and the slide groove (1-3-1).

4. The combined rectangular pipe jacking device according to claim 1, characterized in that, The segment (4) also includes connected L-shaped prestressed concrete components (4-1) and slab-shaped prestressed concrete components (4-2). The L-shaped prestressed concrete components (4-1) and slab-shaped prestressed concrete components (4-2) are connected by CT socket components (4-1-1). The segment (4) is circumferentially connected to the jacking unit by a self-locking sawtooth thread insertion device (4-4). The jacking units are connected to each other by guide groove components (4-3). The guide chute component (4-3) is longitudinally connected between two L-shaped prestressed concrete components (4-1) by connecting steel bars (4-3-1).

5. A combined rectangular pipe jacking device according to claim 4, characterized in that, The segment (4) also includes a sealing gasket (4-5), which is disposed on the outer ring of the L-shaped prestressed concrete member (4-1).

6. A combined rectangular pipe jacking device according to claim 1, characterized in that, The pipe jacking unit includes a casing (1-1) for the pipe jacking machine and a cutter head (1-2) disposed inside the casing. The diameter of the cutter head (1-2) is smaller than the outer contour of the jacking unit.

7. A combined rectangular pipe jacking device according to claim 1, characterized in that, The contact edges of the central pipe jacking unit (3), the edge pipe jacking unit (2), and the apex pipe jacking unit (1) are of equal length.

8. A method for constructing a combined rectangular pipe jacking device, used to construct the combined rectangular pipe jacking device according to any one of claims 1-7, characterized in that, include: The central jacking unit (3) is pushed in by the jacking cylinder (5); Pipe segments (4) are spliced ​​at the jacking end of the central pipe jacking unit (3). The guide and connecting chute device (1-3) and the guide chute component (4-3) push multiple edge jacking units (2) adjacent to the central jacking unit (3) along a predetermined path. Splice pipe segments (4) at the jacking end of each edge jacking unit (2); The guide and connecting chute device (1-3) and the guide chute component (4-3) push the corner jacking unit (1) at the corner along a predetermined path. By splicing pipe segments (4) at the jacking ends of each corner jacking unit (1), a combined rectangular jacking device is formed.

9. A method for constructing a combined rectangular pipe jacking device, used to construct the combined rectangular pipe jacking device according to any one of claims 1-7, characterized in that, include: The edge jacking unit (2) located in the first row is pushed in by the jacking cylinder (5); Splice pipe segments (4) at the jacking end of the edge jacking unit (2); The guide and connecting chute device (1-3) and the guide chute component (4-3) push the corner jacking unit (1) adjacent to the edge jacking unit (2) along a predetermined path. Splice pipe segments (4) at the jacking end of each corner jacking pipe unit (1). The guide and connecting chute device (1-3) and the guide chute component (4-3) push multiple jacking units located in the second row adjacent to the first row along a predetermined path; The jacking units are jacked up row by row until the last row is reached. The pipe segments (4) corresponding to the last row of jacking units are connected to form a combined rectangular jacking device.

10. A construction method for a combined rectangular pipe jacking device, characterized in that, include: Based on the construction method of the combined rectangular pipe jacking device according to claim 8 or 9, a combined rectangular pipe jacking device is formed to complete the first stage jacking operation. Precast pipe sections are assembled one by one behind the starting well, and each pipe jacking unit alternates and cycles to carry out the next stage of jacking operation until all pipe jacking units reach the receiving well.

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