Rectangular pipe jacking connectable pipe joint assembly and construction method

Abstract

The present disclosure relates to a rectangular pipe-jacking connectable pipe joint assembly and a construction method. The connectable pipe joint assembly includes a jacking pipe joint and at least one follow-up pipe joint. Both the jacking pipe joint and the follow-up pipe joint include inner and outer steel sleeves, connectors, and cutting edges. The jacking pipe joint further includes a first pressurized docking member, and the follow-up pipe joint further includes a second pressurized docking member. The inner and outer steel sleeves are concentrically arranged and form a hollow area therebetween. The connectors are arranged in the hollow area and radially connect and fix the inner and outer steel sleeves. The cutting edges are arranged at the edges of the inner and outer steel sleeves of the jacking pipe joint and in the jacking direction of the connectors. The longitudinal connection and fixation between the jacking pipe joint and the follow-up pipe joint are achieved through the pressurized docking members. The rectangular pipe-jacking connectable pipe joint assembly proposed by the present disclosure can achieve the connection between short-distance rectangular pipe jackings through the mutual advancement and pressurized docking between pipe joints without excavating the ground surface and disturbing ground traffic and structures.

Description

Technical Field

[0001] The present disclosure relates to the technical field of underground pipe jacking engineering, and particularly to a rectangular pipe jacking connectable pipe joint assembly and a construction method thereof. Background Art

[0002] In recent years, the rapid development of urban construction has continuously increased the requirements for the construction of urban underground space. In order to ensure smooth urban ground traffic, reduce the excavation of the urban surface, minimize groundwater loss, ground deformation and the impact on surrounding buildings, the traditional construction technologies for underground pipelines and pedestrian passages are increasingly unable to meet the needs of engineering construction. The pipe jacking method is a trenchless construction method developed after the shield tunneling method and has been widely used in urban tunnel construction, with minimal excavation of the ground surface, so as to minimize the damage to the urban underground.

[0003] The multi-line close-proximity parallel large-section rectangular pipe jacking project is a key and difficult point in the development of pipe jacking projects. The lateral spacing of large-section rectangular pipe jacks is small. At some special positions, the pipelines need to be connected to meet the requirements of normal use functions and the overall mechanical properties and deformation performance of the structure. Currently, the connection of close-proximity pipe jacking pipe joints uses the open cut method for construction. Due to some factors such as dewatering and foundation pit excavation, it inevitably causes ground deformation, resulting in road surface settlement and cracking in surrounding areas and damage to houses.

[0004] Therefore, it is necessary to design a pipe joint assembly that can connect large-section close-proximity rectangular pipe jacks without excavating the ground surface and disturbing ground traffic and structures, and can meet the requirements of normal use functions and the overall mechanical properties and deformation performance of the structure. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the main purpose of the present disclosure is to provide a rectangular pipe jacking connectable pipe joint assembly and a construction method thereof to solve one or more problems in the prior art.

[0006] The technical solution of the present disclosure is as follows:

[0007] The present disclosure provides a rectangular pipe jacking connectable pipe joint assembly on the one hand, including a jacking pipe joint and at least one following pipe joint, wherein:

[0008] The jacking pipe joint includes an outer steel sleeve, an inner steel sleeve, a connecting member, a cutting edge and a first pressurized docking member;

[0009] The following pipe joint includes an outer steel sleeve, an inner steel sleeve, a connecting member and a second pressurized docking member;

[0010] The outer steel sleeve and the inner steel sleeve are concentrically arranged and form a hollow area therebetween;

[0011] The connecting member radially connects and fixes the outer steel sleeve and the inner steel sleeve within the hollow region;

[0012] The cutting edge is arranged at the edges of the outer steel sleeve, the inner steel sleeve and the connecting member of the jacking pipe section in the jacking direction;

[0013] The jacking pipe section and the following pipe section are docked and fixed through the first pressurized docking member and the second pressurized docking member, realizing the longitudinal connection and fixation of the connectable pipe section assembly.

[0014] In some embodiments, there are multiple following pipe sections, and the subsequent following pipe sections and the front following pipe sections are mutually docked and fixed through the second pressurized docking member, realizing the longitudinal connection and fixation of the connectable pipe section assembly.

[0015] In some embodiments, supports are welded to the corners of the outer steel sleeve.

[0016] In some embodiments, the jacking pipe section and / or the following pipe section further includes a grouting pipe, and the grouting pipe is arranged on the outer steel sleeve, the inner steel sleeve and / or the connecting member for grouting into the hollow region; preferably, the grouting pipe is a grouting pipe with an arc-shaped cross-section and is arranged on the inner wall of the outer steel sleeve and the outer wall of the inner steel sleeve, and the pipe wall is provided with radial grouting holes.

[0017] In some embodiments, chutes are formed on the connecting members of the jacking pipe section and the following pipe section, and the first pressurized docking member and the second pressurized docking member are pre-set in the chutes.

[0018] In some embodiments, the first pressurized docking member on the jacking pipe section includes at least one row of concave sawteeth arranged in sequence, and the concave sawteeth are fixedly arranged in the chute; the second pressurized docking member on the following pipe section includes at least one row of concave sawteeth and convex sawteeth arranged in sequence, the concave sawteeth are fixedly arranged in the reserved groove, the convex sawteeth can slidably engage with the concave sawteeth, and when the jacking pipe section and the following pipe section are docked and / or two following pipe sections are mutually docked, the convex sawteeth are partially pushed into the concave sawteeth of the front pipe section, and the convex sawteeth engage with the concave sawteeth and are locked in the reverse direction; preferably, the chute on the jacking pipe section is closed on the jacking surface of the connecting member, and the chute on the following pipe section penetrates through the connecting member; preferably, the engaging surface of the concave sawteeth and the convex sawteeth is an arc surface, and the arc surface slopes upward towards the jacking direction; preferably, the overall engagement of the convex sawteeth and the concave sawteeth is a cuboid structure.

[0019] In some embodiments, the cutting edge is serrated or slightly circular arc-shaped, the slightly circular arc faces the hollow region between the outer steel sleeve and the inner steel sleeve, and its smooth outer surface contacts the external soil.

[0020] On the other hand, the present disclosure provides a construction method based on the connectable pipe joint assembly provided in one aspect of the present disclosure, which is used to connect the starting target pipeline and the receiving target pipeline of the rectangular pipe jacking, including:

[0021] S1: Arrange jacking guides at the designated jacking position of the starting target pipeline, remove the pipeline wall at the pre-connection position between the designated jacking position of the starting target pipeline and the designated receiving position of the receiving target pipeline, and reinforce the pipeline wall at the designated receiving position of the receiving target pipeline;

[0022] S2: While S1 is being implemented, transport the jacking pipe joint in the starting target pipeline to the designated jacking position, install it in the jacking guide, start the jacking guide, and the jacking pipe joint jacks forward;

[0023] S3: When the edge of the jacking pipe joint in its backfill direction is flush with the inner wall of the starting target pipeline, the jacking pipe joint is disengaged from the jacking guide, transport the following pipe joint in the starting target pipeline to the designated jacking position, and start the jacking guide;

[0024] S4: When the following pipe joint is in close contact with the jacking pipe joint, pressurize and push all the second pressurized docking members of the following pipe joint so that they enter the designated positions of the first pressurized docking members of the jacking pipe joint, realizing the pressurized automatic docking of the following pipe joint and the jacking pipe joint;

[0025] S5: When the jacking pipe joint is completely jacked into the designated receiving position of the receiving target pipeline and the edge of the following pipe joint in its jacking direction is flush with the inner wall of the receiving target pipeline, the jacking work is completed;

[0026] S6: Dismantle the jacking pipe joint, dismantle the jacking guide, and reinforce at the starting and receiving positions to complete the construction operation of connecting the two target pipelines.

[0027] In some embodiments, it further includes S4-1: Continue to push the subsequent following pipe joints. When the subsequent following pipe joints are in close contact with the previous following pipe joints, pressurize and push the second pressurized docking members of the subsequent following pipe joints so that they enter the designated positions of the second pressurized docking members of the previous following pipe joints, realizing the pressurized automatic docking between the following pipe joints.

[0028] In some embodiments, in S2, when installing the jacking pipe joint in the jacking guide, it further includes connecting a grouting pipe, starting an automatic grouting system, and the automatic grouting system grouts synchronously during the forward jacking process of the jacking pipe joint;

[0029] Preferably, in S4, pressurize and push the convex sawteeth of the second pressurized docking members of the following pipe joint so that half of each group of convex sawteeth enters the concave sawteeth of the first pressurized docking members of the jacking pipe joint;

[0030] In S5, the convex sawteeth of the second pressurized docking member for pressing and advancing the following pipe section are pressed, so that half of each group of convex sawteeth enter the concave sawteeth of the second pressurized docking member of the front following pipe section.

[0031] The beneficial effects of the present disclosure compared with the prior art are as follows: The proposed rectangular pipe jacking connectable pipe section assembly of the present disclosure can connect large-section and short-distance rectangular pipe jacking without excavating the ground surface and disturbing ground traffic and structures. By adopting an automatic jacking guide rail, automatic pressurized docking, and intelligent real-time monitoring, the construction disturbance and structural damage to the target pipeline, especially the starting target pipeline, are reduced, and the occurrence of sudden manual construction accidents is reduced. Specifically, it has at least the following actual effects:

[0032] (1) The connectable pipe section assembly includes a jacking pipe section and a following pipe section, which is a rectangular structure welded by steel plates. It can be prefabricated in a steel structure processing factory without on-site construction assembly. Compared with reinforced concrete pipe sections, it is lighter in weight, more convenient for transportation, and more stable in overall force.

[0033] (2) The pressurized docking member can realize micro-pressurized one-way insertion during docking and reverse self-locking after insertion. The pressurized docking member can enhance the overall tensile stiffness and shear strength. The tensile stiffness can prevent the pipe sections from disconnecting or deforming front and back, and the shear strength can prevent the pipe sections from being misaligned left and right.

[0034] (3) The pressurized docking member is an internal pressurized docking member arranged inside each connectable pipe section. While meeting the requirements of fast, convenient, accurate, and flexible docking, it reduces the occupation of space by external docking members and the inconvenience brought to prefabrication and transportation.

[0035] (4) The grouting pipe is arranged in the hollow area formed by the outer steel sleeve and the inner steel sleeve. By synchronously grouting into the hollow area, the retained soil between the outer steel sleeve and the inner steel sleeve is fully mixed and consolidated with the grout, improving the overall strength and bearing capacity. Description of the Drawings

[0036] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0037] The structures, proportions, sizes, etc. shown in this specification are only used to match the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of this disclosure. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that this disclosure can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in this disclosure.

[0038] Figure 1 It is the front view of the jacking pipe section in an embodiment of this disclosure;

[0039] Figure 2 It is the rear view of the jacking pipe section in an embodiment of this disclosure;

[0040] Figure 3 It is the side view of the jacking pipe section in an embodiment of this disclosure;

[0041] Figure 4 It is the front view of the following-up pipe section in an embodiment of this disclosure (the rear view is the same);

[0042] Figure 5 It is the side view of the following-up pipe section in an embodiment of this disclosure;

[0043] Figure 6 It is the schematic diagram of the arrangement of the first pressurized docking member on the connector of the jacking pipe section in an embodiment of this disclosure;

[0044] Figure 7 It is the schematic diagram of the arrangement of the second pressurized docking member on the connector of the following-up pipe section in an embodiment of this disclosure;

[0045] Figure 8 It is the schematic diagram of the engagement of the convex saw teeth and the concave saw teeth in an embodiment of this disclosure;

[0046] Figure 9 It is the schematic diagram of the separation of the convex saw teeth and the concave saw teeth in an embodiment of this disclosure;

[0047] Figure 10 It is the schematic diagram of the arrangement of the cutting edges on the outer steel sleeve, inner steel sleeve and support member of the jacking pipe section in an embodiment of this disclosure, where (a) is one perspective and (b) is another perspective;

[0048] Figure 11 It is the schematic diagram of the arrangement of the cutting edges on the connector of the jacking pipe section in an embodiment of this disclosure, where (a) is one perspective and (b) is another perspective;

[0049] Figure 12 It is the schematic diagram of the construction method of the multi-line close-proximity rectangular jacking pipe connectable pipe section assembly of this disclosure. Specific embodiments

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer and more understandable, the embodiments of the present disclosure will be further described in detail below in conjunction with the embodiments and the accompanying drawings. Herein, the illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure, but not to limit the present disclosure.

[0051] In the present disclosure, unless otherwise clearly defined and limited, terms such as "installation", "connection", "attachment", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0052] It should be understood that terms such as "include / contain", "consist of", or any other variant are intended to cover non-exclusive inclusion, so that a product, device, process, or method including a series of elements not only includes those elements, but may also include other elements not explicitly listed when needed, or further includes elements inherent to such a product, device, process, or method. Without more limitations, the elements defined by the statement "include / contain..." or "consist of..." do not exclude the existence of additional identical elements in the product, device, process, or method including the said elements.

[0053] It is also necessary to understand that terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device, component, or structure referred to must have a specific orientation, be constructed or operated in a specific orientation, and cannot be understood as a limitation to the present disclosure.

[0054] Currently, the connection of current short-distance jacking pipe segments mostly adopts the open-cut method. Due to some factors such as dewatering and foundation pit excavation, the open-cut method inevitably causes formation deformation, resulting in settlement and cracking of the surrounding ground surface and damage to houses.

[0055] Based on this, the present disclosure designs a rectangular jacking pipe connectable pipe segment assembly. This rectangular jacking pipe connectable pipe segment assembly can connect rectangular jacking pipes without excavating the ground surface and disturbing ground traffic and structures, can overcome the disadvantages of the existing open-cut method construction, and meet the requirements of normal use functions and the overall mechanical properties and deformation performance of the structure.

[0056] The rectangular jacking pipe interconnectable pipe segment assembly disclosed in the present invention is particularly used for interconnection of multiple lines of close-distance parallel large-section rectangular jacking pipes. The so-called "multiple lines" means that there are multiple parallel rectangular jacking pipelines, which is a prerequisite for the use of the interconnectable pipe segment assembly; the so-called "close distance" means that the lateral distance between adjacent parallel pipelines cannot be too far, otherwise the interconnectable pipe segments are difficult to correct during jacking and difficult to implement. In the present disclosure, it is preferably limited to a range of 1 to 3 meters. At the same time, "close distance" is also an important factor restricting the width of the strip steel plate; the so-called "large cross-section" is the guarantee for the connection of pipelines to form a large underground space. If the cross-section is too small (such as water and electricity pipelines and cables), it cannot be connected to form a large space. In the present disclosure, it is preferably limited to a rectangular jacking pipe with a width of 2 to 4 meters and a height of 2 to 4 meters. It should be noted that the above dimensions are only exemplary preferences and are not exclusive limitations.

[0057] In the present disclosure, the two rectangular jacking pipes used for connection are defined as the originating target pipeline 11 and the receiving target pipeline 12 respectively. The rectangular jacking pipe can connect the pipe segment assembly and push it from the originating target pipeline 11 to the receiving target pipeline 12 to achieve the connection between the two target pipelines.

[0058] The implementation of the present disclosure is described in detail below in conjunction with preferred implementations.

[0059] The rectangular jacking pipe-connectable pipe segment assembly disclosed in the present invention comprises a jacking pipe segment 100 and at least one follow-up pipe segment 200, which is used to connect the starting target pipeline 11 and the receiving target pipeline 12 of the rectangular jacking pipe.

[0060] See also Figures 1 to 3 The jacking pipe section 100 includes an outer steel sleeve 1, an inner steel sleeve 2, a connecting piece 3, a blade 4 and a first pressurized docking component 51; the outer steel sleeve 1 and the inner steel sleeve 2 are concentrically arranged and form a hollow area 300 therebetween; the connecting piece 3 is arranged in the hollow area 300 and radially connects and fixes the outer steel sleeve 1 and the inner steel sleeve 2; the blade 4 is arranged on the edges of the outer steel sleeve 1, the inner steel sleeve 2 and the connecting piece 3 of the jacking pipe section 100 in the jacking direction.

[0061] It is easy to understand that the outer steel jacket 1 and the inner steel jacket 2 are steel frames, for example, formed by welding strip steel plates end to end, or integrally formed, the width of the outer steel jacket 1 and the inner steel jacket 2, that is, the width of the strip steel plate, is for example 40-60 cm, preferably 50 cm, prefabricated in the factory, and modularly formed. It should be understood that the blade 4 can be set separately or simultaneously on the edge of the outer steel jacket 1 and the inner steel jacket 2 in the jacking direction, or further set on the edge of the connecting member 3 in the jacking direction.

[0062] See also Figures 4 to 5, the follow-up pipe section 200 includes an outer steel sleeve 1, an inner steel sleeve 2, a connecting member 3, and a second pressurized docking member 52; the outer steel sleeve 1 and the inner steel sleeve 2 are concentrically arranged and form a hollow area 300 therebetween; the connecting member 3 is arranged in the hollow area 300 and radially connects and fixes the outer steel sleeve 1 and the inner steel sleeve 2.

[0063] During specific implementation, when the jacking pipe section 100 is pressurized and docked with a section of the follow-up pipe section 200, the longitudinal connection and fixation between the jacking pipe section 100 and the follow-up pipe section 200 are achieved through the pressurized docking of the first pressurized docking member 51 and the second pressurized docking member 52.

[0064] It is easy to understand that when multiple sections of the follow-up pipe section 200 are required, the subsequent follow-up pipe section 200 and the front follow-up pipe section 200 are pressurized and docked with each other through the second pressurized docking member 52 to achieve longitudinal connection and fixation as a whole. It should be understood that the longitudinal direction here is the axial direction, that is, the central axis direction of the jacking pipe section 100 and the follow-up pipe section 200.

[0065] In some embodiments, the connecting member 3 is made of I-shaped steel. The outer steel sleeve 1 and the inner steel sleeve 2 of the jacking pipe section 100 and the follow-up pipe section 200 are welded together in the hollow area 300 through the connecting member 3 made of I-shaped steel. By welding the outer steel sleeve 1 and the inner steel sleeve 2 with the connecting member 3 made of I-shaped steel, the overall connection can be made more firm and the overall force-bearing can be more stable.

[0066] In some embodiments, the thicknesses of the outer steel sleeve 1 and the inner steel sleeve 2 on the jacking pipe section 100 and the follow-up pipe section 200 are determined by the soil conditions at the construction location and the overall dimensions of the pipe section, and are generally not greater than 200 mm; preferably, the outer steel sleeve 1 and the inner steel sleeve 2 are made of thin steel sleeves, and the thinner steel plates can be more easily jacked in the soil.

[0067] The outer diameter of the jacking pipe section 100 and the follow-up pipe section 200, that is, the size of the outer steel sleeve 1, should not be greater than the minimum clearance size between the connected starting target pipeline 11 and the receiving target pipeline 12. The inner diameter of the jacking pipe section 100 and the follow-up pipe section 200, that is, the size of the inner steel sleeve 2, is determined by the soil conditions at the construction location and is generally not less than 70% of the outer diameter size.

[0068] Preferably, the aspect ratio of the connecting member 3 is determined by the inner and outer diameter sizes and the force-bearing conditions of the inner and outer steel sleeves.

[0069] In some embodiments, a support member 6 is connected to the corner of the outer steel sleeve 1 of the jacking pipe section 100 and / or the follow-up pipe section 200. Welding the support member 6 at the corner is to reinforce the outer steel sleeve 1 and prevent stress deformation at the corner when bearing the upper load. Preferably, the support member 6 is welded to the corner of the outer steel sleeve 1. It should be understood that the corner here can be the two corners of the outer steel sleeve 1 that bear the upper soil layer load at the upper end, or the four corners of the outer steel sleeve 1.

[0070] In some embodiments, see Figures 1 to 5 The jacking pipe section 100 and / or the follow-up pipe section 200 further include a grouting pipe 7. Preferably, the grouting pipe 7 is arranged on the outer steel jacket 1, the inner steel jacket 2 and / or the connecting piece 3. The grouting pipe 7 is used to inject grout into the hollow area 300 formed by the outer steel jacket 1 and the inner steel jacket 2, so that the retained soil between the outer steel jacket 1 and the inner steel jacket 2 is fully mixed with the grouting liquid and firmly consolidated, thereby improving the overall strength and bearing capacity.

[0071] In some embodiments, the grouting pipe 7 can be arranged on the inner wall of the outer steel jacket 1 and the outer wall of the inner steel jacket 2. Preferably, the grouting pipe 7 can also be arranged on the surface of the connecting member 3 facing the hollow area 300.

[0072] It should be understood that the grouting pipe 7 is a steel pipe, which is welded to the inner wall of the outer steel jacket 1 , the outer wall of the inner steel jacket 2 and / or the surface of the connecting member 3 facing the hollow area 300 .

[0073] In specific implementation, the grouting pipe 7 can be a square cross-section grouting pipe, a circular cross-section grouting pipe or a semicircular cross-section grouting pipe. The present disclosure is preferably a semicircular cross-section grouting pipe. It should be understood that the radius and curvature of the semicircular cross-section grouting pipe are determined by the soil conditions at the construction location and the inner and outer diameters of the jacking pipe section 100 and the follow-up pipe section 200.

[0074] It is easy to understand that the flat side of the semicircular cross-section grouting pipe can be welded more firmly to the outer steel sleeve 1, the inner steel sleeve 2 and / or the connecting piece 3, and the arc surface is easier to contact with the soil layer, with low resistance, which is convenient for grouting.

[0075] It should be understood that the square-section grouting pipe, circular-section grouting pipe or semicircular-section grouting pipe mentioned herein refers to the square, circular or semicircular shape seen after the grouting pipe 7 is cut along the radial direction.

[0076] In specific implementation, the wall of the grouting pipe is radially staggered with grouting holes (not shown in the figure), and the grouting holes are opened to facilitate grouting into the soil in the hollow area 300. The staggered holes can make the slurry injected into the hollow area 300 more uniform, and facilitate full mixing and consolidation with the soil in the hollow area 300. It should be understood that the grouting here adopts the pressure rotary jet grouting method or other reasonable and feasible grouting methods.

[0077] In some embodiments, see Figures 1 to 5 A chute 5 is provided on the connecting piece 3 of the jacking pipe section 100 and the follow-up pipe section 200. Preferably, the first pressurized docking member 51 and the second pressurized docking member 52 are pre-arranged in the chute 5. It should be understood that the chute here is a through groove or through hole, a receiving groove, or a receiving cavity, which is used to set and receive the pressurized docking member.

[0078] In some embodiments, referring to Figures 6 to 7 , the first pressurized docking member 51 disposed in the chute 5 on the connecting member 3 of the jacking pipe section 100 includes at least one column of concave sawteeth 8 arranged in sequence, and the second pressurized docking member 52 disposed in the chute 5 on the connecting member 3 of the following pipe section 200 includes at least one column of concave sawteeth 8 and convex sawteeth 9 arranged in sequence.

[0079] It should be understood that the at least one column mentioned here can be one column, two columns, three columns or multiple columns. The specific number of columns is not limited here and is set according to the actual construction needs. As long as the number of columns of the concave sawteeth 8 of the first pressurized docking member 51 is the same as the number of columns of the concave sawteeth 8 and the convex sawteeth 9 of the second pressurized docking member 52.

[0080] Preferably, the concave sawteeth 8 of the first pressurized docking member 51 are fixedly arranged in the chute 5. For example, the bottom of the concave sawteeth 8 is welded or integrally formed in the chute 5. The concave sawteeth 8 of the second pressurized docking member 52 are fixedly arranged in the chute 5. The convex sawteeth 9 of the second pressurized docking member 52 can slidably engage with the concave sawteeth 8, and when the jacking pipe section 100 is docked with the following pipe section 200 and / or when two following pipe sections 200 are docked with each other, the convex sawteeth 9 can be partially pressurized and pushed onto the concave sawteeth 8 of the front pipe section to engage with each other and be reversely locked.

[0081] It should be understood that the so-called reverse locking means that after the concave sawteeth 8 and the convex sawteeth 9 are engaged with each other, the convex sawteeth 9 cannot move along the reverse direction of jacking anymore. In this way, the reverse locking can enhance the connection strength between adjacent pipe sections and the overall stiffness after connection, and prevent the pipe sections from being disconnected or deformed before and after.

[0082] By adopting the pressurized docking member of the present disclosure, mainly: one is to enhance the overall stiffness and strength: enhance the tensile stiffness to prevent the pipe sections from being disconnected or deformed before and after; enhance the shear strength to prevent the pipe sections from being misaligned left and right; the other is to achieve automatic and precise docking. In contrast, the conventional bolt connection has weak shear resistance and requires a large number of high-strength bolts, and it is difficult to achieve automatic connection; the tensile strength of the mortise and tenon structure along the insertion direction is very small, and it is also easy to be pulled out in the insertion direction, unless a complex mortise and tenon structure is adopted, such as using several mortise and tenons in different directions at the same time, but it is difficult to achieve structurally.

[0083] Continuing to refer to Figures 6 to 7 , the chute 5 on the jacking pipe section 100 is closed on the jacking surface of the connecting member 3, and the chute 5 on the following pipe section 200 penetrates through the connecting member 3.

[0084] It should be understood that the closed jacking surface mentioned here means that the chute 5 on the jacking pipe section 100 does not penetrate through the connecting piece 3, and only a part is arranged on the connecting piece 3 along the soil-back side, which is convenient for connecting with the subsequent pipe section, and ensures that all the concave sawteeth 8 on the jacking pipe section 100 are completely meshed with and reversely locked by some of the convex sawteeth 9 on the following-up pipe section 200, so that it can neither slide along the jacking direction of the jacking pipe section 100 nor slide along the soil-back direction of the jacking pipe section 100.

[0085] It should be understood that the chute 5 on the connecting piece 3 of the following-up pipe section 200 is arranged in a through manner, which is to facilitate the convex sawteeth 9 on the following-up pipe section 200 to be pressed and pushed along the jacking direction onto the concave sawteeth 8 on the jacking pipe section 100 for meshing, and to facilitate the convex sawteeth 9 on the subsequent pipe section to be pressed and pushed onto the concave sawteeth 8 on the previous following-up pipe section 200 for meshing again.

[0086] During specific implementation, the length of the chute 5 on the connecting piece 3 of the jacking pipe section 100 is not greater than the length of the chute 5 on the connecting piece 3 of the following-up pipe section 200. Preferably, the length of the chute on the connecting piece 3 of the jacking pipe section 100 is half of the width of the pipe section, that is, half of the length of the chute 5 on the connecting piece 3 of the following-up pipe section 200. It is easy to understand that the present disclosure preferably is one half, that is, the length of the chute on the connecting piece 3 of the jacking pipe section 100 is half of the length of the chute on the connecting piece 3 of the following-up pipe section 200. During the jacking process, the first half of the convex sawteeth 9 in the chute 5 on the connecting piece 3 of the adjacent following-up pipe section 200 to the jacking pipe section 100 are meshed with all the concave sawteeth 8 in the chute 5 on the connecting piece 3 of the jacking pipe section 100, the second half of the convex sawteeth 9 are meshed with the first half of the concave sawteeth 8 of its own pipe section, and the second half of the concave sawteeth 8 of its own pipe section are meshed with the first half of the convex sawteeth 9 pressed forward by the subsequent pipe section, and so on. In this way, the connection between the jacking pipe section 100 and the following-up pipe section 200 and the connection between the following-up pipe section 200 and the subsequent following-up pipe section 200 can be realized, ensuring that the connection strength between the jacking pipe section 100 and the following-up pipe section 200 and the connection strength between two following-up pipe sections 200 are the same.

[0087] It should be understood that the so-called first half is the first half section arranged along the jacking direction, and the second half is the second half section arranged along the jacking direction.

[0088] See Figure 8 、 Figure 9 , the overall meshing of the concave sawteeth 8 and the convex sawteeth 9 is rectangular, and the meshing surface is an arc surface, and the arc surface slopes upward towards the jacking direction. It should be understood that the overall meshing of the convex sawteeth 9 and the concave sawteeth 8 into a rectangle is to facilitate accommodation in the chute 5, the meshing surface is designed as an arc surface, and one side of the arc surface faces the jacking direction, ensuring that the convex sawteeth 9 can be easily pressed and pushed forward along the arc surface towards the jacking direction and cannot move in the reverse jacking direction.

[0089] During specific implementation, the number of concave sawteeth 8 in at least one row of the first pressure docking component 51 on the jacking pipe section 100 should be no less than two, and the number of convex sawteeth 9 in at least one row of the second pressure docking component 52 on the following pipe section 200 should be no less than four. Ensure that after a part of the convex sawteeth 9 on the following pipe section 200 are pressed forward to mesh with all the concave sawteeth 8 on the jacking pipe section 100, there are still remaining convex sawteeth 9 meshing with the concave sawteeth 8 on this pipe section, thus realizing the connection between the two pipe sections.

[0090] Similarly, the connection between the following pipe section 200 and the following pipe section 200 is also like this. Before pressure docking, the number of concave sawteeth 8 on the following pipe section 200 corresponds to the number of convex sawteeth 9. When pressure docking, a part of the convex sawteeth 9 on the following pipe section 200 are pressed forward to mesh with the concave sawteeth 8 on the pre - placed following pipe section 200, the remaining convex sawteeth 9 on the following pipe section 200 mesh with the concave sawteeth 8 on this following pipe section 200, and the convex sawteeth 9 on the rear - placed pipe section are pressed forward again to mesh with the remaining concave sawteeth 8 on this following pipe section 200, thus realizing the connection between this following pipe section 200 and the pre - placed pipe section and the rear - placed pipe section.

[0091] It should be understood that the number of rows and the number of sawteeth can be determined by the tensile, compressive, and flexural properties obtained from the mechanical tests before pre - casting the pipe sections. Preferably, the first pressure docking component 51 in the present disclosure is preferably a row of sequentially arranged concave sawteeth 8. The number of concave sawteeth 8 is preferably an even number, for example, no less than four. The second pressure docking component 52 is preferably a row of sequentially arranged concave sawteeth 8 and convex sawteeth 9, and the number of concave sawteeth 8 corresponds to the number of convex sawteeth 9, and is also preferably an even number, for example, eight. In this way, the first four convex sawteeth 9 of the second pressure docking component 52 of the following pipe section 200 enter into the four concave sawteeth 8 of the first pressure docking component 51 of the jacking pipe section 100, the last four convex sawteeth 9 of the second pressure docking component 52 are joined with the first four concave sawteeth 8 of itself, and the last four concave sawteeth 8 of the second pressure docking component 52 are used to join with the first four convex sawteeth 9 of the second pressure docking component 52 of the subsequent following pipe section 200, and so on. Through the engagement of multiple concave and convex sawteeth, the docking of the pipe sections is more firm, and with the engagement of an even number of concave and convex sawteeth, the front - and - rear forces are more consistent.

[0092] Continue to refer to Figures 6 to 9 that the height of the convex sawteeth 9 should not be less than the height of the concave sawteeth 8. Preferably, the convex sawteeth 9 include two parts, that is, the lower convex arc body with the same height as the concave sawteeth 8 that can be completely meshed with the concave sawteeth 8 to form a rectangle, and the cuboid or cube extending upward from the convex arc body.

[0093] It should be understood that the convex arc extends upward for a certain length to make the convex serrations 9 stronger and the overall force-bearing more stable. Since the concave serrations 8 and the convex serrations 9 are integrally engaged in the chute 5, to ensure that the convex serrations 9 can be pushed forward onto the concave serrations 8 of the front pipe section, the height of the chute 5 should not be less than the sum of the heights of the convex serrations 9 and the concave serrations 8.

[0094] See Figures 10 to 11 , the cutting edge 4 is welded to the edges of the outer steel sleeve 1, the inner steel sleeve 2, the connecting member 3, and / or the support member 6 of the jacking pipe section 100 in the jacking direction.

[0095] Preferably, the cutting edge 4 is serrated or micro-circular arc-shaped, the micro-circular arc faces the hollow area 300 between the outer steel sleeve 1 and the inner steel sleeve 2, and its smooth outer surface contacts the external soil mass. The design of the micro-circular arc is used to wrap and gather the cut soil mass into the hollow area 300, facilitating the full mixing and consolidation of the soil mass in the hollow area 300 with the grouting liquid.

[0096] In specific implementation, the cutting edge 4 needs to be edge-treated to meet the requirements of "small edge angle, small edge radius, longitudinal edge pattern, no burrs, micro-serrations", pass the sharpness test, ensure the soil cutting efficiency, and reduce the uplift of the face soil mass caused by the dulling of the edge part.

[0097] Preferably, the cutting edge 4 is treated with "hardening, toughening, strengthening", and passes the cutting ability test to ensure the efficiency of jacking into the soil mass and a considerable working duration.

[0098] Preferably, the cutting edge 4 is a steel member. In the quenching of the cutting edge 4 steel, manganese element (Mn) and tungsten element (W) can be added to improve the quenching effect and enhance the hardenability, strength, toughness, and wear resistance performance.

[0099] In some embodiments, the single-section length of the jacking pipe section 100 and the following pipe section 200 is determined by factors such as the soil conditions at the construction location, the lateral spacing between the starting target pipeline 11 and the receiving target pipeline 12, and the pipe section manufacturing technique. It is allowed that the single-section lengths of the jacking pipe section 100 and the following pipe section 200 are inconsistent, but it must be ensured that the connection distance (the sum of the net distance between the two target pipelines and the wall thickness of their pipe walls) is an integer multiple of the single-section length of the following pipe section 200. On this basis, the number of pipe sections should be reduced as much as possible to ensure the overall stability of the pipe section jacking and the accuracy of the jacking direction.

[0100] In some embodiments, industrial lubricant is applied to the outside of the jacking pipe section 100 and the following pipe section 200 to reduce the friction between the jacking pipe section 100 and the following pipe section 200 and the soil mass when jacking into the soil, which can effectively save the construction period.

[0101] In some embodiments, the jacking pipe section 100 and the following-up pipe section 200 are coated with bisphenol A epoxy resin anticorrosive coating throughout. The hydroxyl groups, ether bonds and epoxy groups have strong adhesion to the substrate; the benzene ring endows the resin with strong mechanical strength and wear resistance; it cures at room temperature, is convenient for construction, has a low curing shrinkage rate, produces no volatile substances, and is green and environmentally friendly.

[0102] In some embodiments, the jacking pipe section 100 and the following-up pipe section 200 are rectangular structures welded by steel plates, which can be prefabricated in a steel structure processing factory and do not require on-site construction and assembly. They are lighter in weight than reinforced concrete pipe sections, more convenient for transportation, and more stable in overall force.

[0103] Preferably, the entire jacking pipe section 100 and the following-up pipe section 200 are made of Q235 carbon structural steel.

[0104] See Figure 12 , the present disclosure also includes a construction method based on a connectable pipe section assembly for rectangular pipe jacking, which is used to connect the starting target pipeline 11 and the receiving target pipeline 12 of the rectangular pipe jacking. The applicable conditions of this construction method are preferably water-rich soft soil strata. There are few or no requirements for water stop and face soil modification during the construction process, which greatly simplifies the construction steps and shortens the construction period. Specifically as follows:

[0105] S1: Arrange the jacking guide rail 10 at the designated jacking position of the starting target pipeline 11, remove the pipeline wall at the pre-connection position between the designated jacking position of the starting target pipeline 11 and the designated receiving position of the receiving target pipeline 12, and reinforce the pipeline wall at the designated receiving position of the receiving target pipeline 12;

[0106] S2: While S1 is being implemented, transport the jacking pipe section 100 in the starting target pipeline 11 to the designated jacking position, install it in the jacking guide rail 10, start the jacking guide rail 10, and closely monitor the settlement of the cut soil and the path accuracy of the jacking pipe section 100;

[0107] S3: When the front edge of the jacking pipe section 100 in the backfill direction reaches the same level as the inner wall of the starting target pipeline 11, the jacking pipe section 100 is disengaged from the jacking guide rail, transport the following-up pipe section 200 in the starting target pipeline 11 to the designated jacking position, and start the jacking guide rail;

[0108] S4: When the following-up pipe section 200 is in close contact with the front jacking pipe section 100, pressurize and push the second pressurized docking member 52 of the following-up pipe section 200 so that it enters the designated position of the first pressurized docking member 51 of the front jacking pipe section 100, and realize the pressurized automatic docking of the following-up pipe section 200 and the jacking pipe section 100;

[0109] S5: When the jacking pipe section 100 is completely jacked into the designated receiving position of the receiving target pipeline 12, and the edge of the subsequent following pipe section 200 in the jacking direction is flush with the inner wall of the receiving target pipeline 12, the jacking work is completed;

[0110] S6: Demolish the jacking pipe section, remove the jacking guide rail 10, and reinforce at the starting and receiving positions to complete the construction operation of connecting the two target pipelines.

[0111] When multiple following pipe sections 200 need to be used due to the lateral distance between rectangular pipelines or the width of the pipe sections, in S4, it is necessary to continue to push the subsequent following pipe sections 200. When the subsequent following pipe sections 200 are in close contact with the previous following pipe sections 200, pressurize and push the second pressurized docking member 52 of the subsequent following pipe sections 200 so that it enters the designated position of the second pressurized docking member 52 of the previous following pipe sections 200, realizing the pressurized automatic docking between the following pipe sections 200; Repeat this step according to the actual situation until the jacking is completed.

[0112] In some cases, in S2, when installing the jacking pipe section 100 on the jacking guide rail 10, it also includes connecting the grouting pipe 7 and starting the automatic grouting system. During the forward jacking process of the jacking pipe section 100, the automatic grouting system grouts synchronously, so that the retained soil between the outer steel sleeve 1 and the inner steel sleeve 2 is fully mixed and consolidated with the slurry, forming an intermediate reinforced body, which together with the outer steel sleeve 1 and the inner steel sleeve 2 plays a bearing role to ensure that the top soil has no settlement deformation or the deformation is controllable.

[0113] For the pressurized docking member with a concave-convex serrated structure, in S4, pressurize and push the convex serrations 9 of the second pressurized docking member 52 of the following pipe section 200 so that half of each group of convex serrations 9 enters the concave serrations 8 of the first pressurized docking member 51 of the jacking pipe section 100; In S5, pressurize and push the convex serrations 9 of the second pressurized docking member 52 of the following pipe section 200 so that half of each group of convex serrations 9 enters the concave serrations 8 of the second pressurized docking member 52 of the previous following pipe section 200.

[0114] Before the on-site installation and jacking of the present disclosure, the jacking pipe section 100 and the following pipe section 200 are first prefabricated, which can be made in a factory or on the construction site, and industrial lubricant and anti-corrosion coating are applied.

[0115] The rectangular pipe jacking connectable pipe section assembly proposed by the present disclosure can connect multi-line close-proximity parallel large-section rectangular pipe jackings without excavating the ground surface, disturbing ground traffic and structures. By adopting an automatic jacking guide rail, automatic pressurized docking, and intelligent real-time monitoring, the construction disturbance and structural damage to the target pipelines, especially to the starting target pipeline, are reduced, and the occurrence of sudden manual construction accidents is reduced.

[0116] Those skilled in the art can easily understand that, on the premise of no conflict, the above preferred solutions can be freely combined and superimposed.

[0117] The above is only the preferred embodiment of the present disclosure, and is not intended to limit the present disclosure. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A rectangular pipe-jacking connectable pipe joint assembly, characterized in that It includes a jacking pipe section and at least one following pipe section, wherein: The jacking pipe section includes an outer steel sleeve, an inner steel sleeve, a connecting piece, a cutting edge and a first pressurized docking member; The following pipe section includes an outer steel sleeve, an inner steel sleeve, a connecting piece and a second pressurized docking member; The outer steel sleeve and the inner steel sleeve are concentrically arranged and form a hollow area therebetween; The connecting piece radially connects and fixes the outer steel sleeve and the inner steel sleeve within the hollow area; The cutting edge is arranged at the edges of the outer steel sleeve, the inner steel sleeve and the connecting piece of the jacking pipe section in the jacking direction; The jacking pipe section and the following pipe section are docked and fixed through the first pressurized docking member and the second pressurized docking member, realizing the longitudinal connection and fixation of the connectable pipe section assembly; and Chutes are formed in the connecting pieces of the jacking pipe section and the following pipe section, and the first pressurized docking member and the second pressurized docking member are pre-set in the chutes; and The first pressurized docking member on the jacking pipe section includes at least one row of concave sawteeth arranged in sequence, and the concave sawteeth are fixedly arranged in the chute; the second pressurized docking member on the following pipe section includes at least one row of concave sawteeth and convex sawteeth arranged in sequence, the concave sawteeth are fixedly arranged in the reserved groove, the convex sawteeth can be slidably engaged with the concave sawteeth, and when the jacking pipe section and the following pipe section are docked and / or two following pipe sections are docked with each other, the convex sawteeth are partially pushed into the concave sawteeth of the front pipe section, and the convex sawteeth are engaged with the concave sawteeth and locked in the reverse direction.

2. The connectable pipe section assembly according to claim 1, wherein: There are multiple following pipe sections, and the subsequent following pipe sections are docked and fixed with the front following pipe sections through the second pressurized docking member, realizing the longitudinal connection and fixation of the connectable pipe section assembly.

3. The connectable pipe section assembly according to claim 1, wherein: Supporting pieces are welded at the corners of the outer steel sleeve.

4. The connectable pipe section assembly according to claim 1, wherein: The jacking pipe section and / or the following pipe section further includes a grouting pipe, and the grouting pipe is arranged on the outer steel sleeve, the inner steel sleeve and / or the connecting piece for grouting into the hollow area.

5. The connectable pipe section assembly according to claim 4, wherein: The grouting pipe is a grouting pipe with an arc-shaped cross section, arranged on the inner wall of the outer steel sleeve and the outer wall of the inner steel sleeve, and the pipe wall is provided with radial grouting holes.

6. The connectable pipe section assembly according to claim 1, wherein: The chute on the jacking pipe section is closed on the jacking surface of the connecting piece, and the chute on the following pipe section penetrates through the connecting piece.

7. The connectable pipe section assembly according to claim 1, wherein: The meshing surface of the concave sawteeth and the convex sawteeth is an arc surface, and the arc surface slopes obliquely upward towards the jacking direction.

8. The connectable pipe section assembly according to claim 1, wherein: The overall meshing of the convex sawteeth and the concave sawteeth is a cuboid structure.

9. The connectable pipe section assembly according to claim 1, wherein: The cutting edge is serrated or slightly arc-shaped, the slightly arc faces the hollow area between the outer steel sleeve and the inner steel sleeve, and its smooth outer surface contacts the external soil body.

10. A construction method based on the connectable pipe joint assembly according to any one of claims 1 to 9, which is used to connect the starting target pipeline and the receiving target pipeline of the rectangular pipe jacking, and is characterized in that It includes: S1: Arrange jacking guides at the designated jacking position of the starting target pipeline, remove the pipeline wall at the pre-connected location between the designated jacking position of the starting target pipeline and the designated receiving position of the receiving target pipeline, and reinforce the pipeline wall at the designated receiving position of the receiving target pipeline; S2: While implementing S1, transport the jacking pipe section in the starting target pipeline to the designated jacking position, install it in the jacking guides, start the jacking guides, and the jacking pipe section jacks forward; S3: When the edge of the jacking pipe section in the backfill direction is flush with the inner wall of the starting target pipeline, the jacking pipe section is disengaged from the jacking guides, transport the following pipe section in the starting target pipeline to the designated jacking position, and start the jacking guides; S4: When the following pipe section is in close contact with the jacking pipe section, pressurize and push all the second pressurized docking components of the following pipe section so that they enter the designated positions of the first pressurized docking components of the jacking pipe section, realizing the pressurized automatic docking between the following pipe section and the jacking pipe section; S5: When the jacking pipe section is completely jacked into the designated receiving position of the receiving target pipeline and the edge of the following pipe section in its jacking direction is flush with the inner wall of the receiving target pipeline, the jacking work is completed; S6: Dismantle the jacking pipe section, dismantle the jacking guides, and reinforce at the starting and receiving positions to complete the construction operation of connecting the two target pipelines.

11. The construction method according to claim 10, characterized in that: It further includes S4-1: Continue to push the subsequent following pipe sections. When the subsequent following pipe sections are in close contact with the previous following pipe sections, pressurize and push the second pressurized docking components of the subsequent following pipe sections so that they enter the designated positions of the second pressurized docking components of the previous following pipe sections, realizing the pressurized automatic docking between the following pipe sections.

12. The construction method according to claim 10, characterized in that: In S2, when installing the jacking pipe section in the jacking guides, it further includes connecting the grouting pipe, starting the automatic grouting system, and the automatic grouting system grouts synchronously during the forward jacking process of the jacking pipe section.

13. The construction method according to claim 10, characterized in that: In S4, pressurize and push the convex sawteeth of the second pressurized docking components of the following pipe section so that half of each group of convex sawteeth enters the concave sawteeth of the first pressurized docking components of the jacking pipe section; In S5, pressurize and push the convex sawteeth of the second pressurized docking components of the following pipe section so that half of each group of convex sawteeth enters the concave sawteeth of the second pressurized docking components of the previous following pipe section.

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