A construction method for oriented construction of interlocking jacking pipe groups

Abstract

The embodiment of the present application discloses a construction method for directional construction of an interlocking jacking pipe group, which can guide and limit the forward direction of the jacking pipe group, solving the problem of difficulty in adjusting the direction of the jacking pipe group. The construction method for directional construction of an interlocking jacking pipe group includes: step S01: jacking a pilot pipe: excavating and jacking two pilot pipes at both ends of a preset distance; step S02: assembling a combined pipe body: assembling a combined pipe body according to the shape of the area to be excavated between the pilot pipes, and the combined pipe body includes a jacking pipe group and guide pipes on both sides thereof; step S03: excavating and jacking the combined pipe body forward: the pilot pipe guides the limiting guide pipe, and excavation and jacking equipment is used to excavate and jack the combined pipe body forward. The embodiment of the present application provides a construction method for directional construction of an interlocking jacking pipe group, which is used for excavating tunnels.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of tunnel engineering, and in particular to a construction method for directional construction of a group of interlocking jacking pipes. Background Art

[0002] When excavating a large-section dark tunnel, the pipe curtain structure method is often used. The pipe curtain structure method is a construction method in which an excavation and jacking device is first used to construct a pipe curtain formed by a number of jacking pipes in the soil layer, and then the soil layer is excavated in the pipe curtain structure. At present, a method of jacking a jacking pipe group at a time has been developed from the previous method of jacking one jacking pipe at a time. The jacking pipe group can be spliced ​​into a linear structure corresponding to the outer edge contour of the tunnel to be excavated, such as an arc structure or a straight structure. The forward direction of the jacking pipe group can be adjusted by adding a directional jack between the cutter head and the jacking pipe group. However, when using the directional jack to adjust the forward direction of the non-linear jacking pipe group, it involves the coordination and displacement distribution of multiple directional jacks, and the adjustment is very difficult. Summary of the invention

[0003] In order to solve the above problems, an embodiment of the present application provides a construction method for directional construction of an interlocking jacking pipe group, which has the following advantages: it can guide and limit the forward direction of the jacking pipe group, solving the problem of difficulty in adjusting the direction of the jacking pipe group.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0005] The present application provides a method for directional construction of a bite-jointed jacking pipe group, comprising:

[0006] Step S01: Pushing in a pilot pipe: excavating and pushing in two pilot pipes at both ends of a preset distance, namely a first pilot pipe and a second pilot pipe;

[0007] Step S02: Assembling the combined pipe body: Assemble the combined pipe body according to the shape of the area to be excavated between the first pilot pipe and the second pilot pipe, guide pipes are provided at both ends of the combined pipe body, which are the first guide pipe and the second guide pipe, respectively. The first guide pipe corresponds to the first pilot pipe, and the second guide pipe corresponds to the second pilot pipe. A jacking pipe group is connected between the first guide pipe and the second guide pipe, and an excavation cutter disc is provided at one end of the jacking pipe group close to the pilot pipe.

[0008] Step S03: excavate and jack the combined pipe body forward: the first pilot pipe guides and limits the first guide pipe, the second pilot pipe guides and limits the second guide pipe, and the excavation and jacking equipment is used to excavate and jack the combined pipe body forward along the extension direction of the pilot pipe.

[0009] The construction method for directional construction of an interlocking jacking pipe group provided in an embodiment of the present application first jacks two pilot pipes at both ends of a preset distance. At this time, high-precision excavation and jacking equipment can be used, or a pressure-adjusting jack can be used to orient the jacking direction of the pilot pipe, and the jacking direction of the pilot pipe can be accurately oriented. Then, the combined pipe body is assembled, and guide pipes corresponding to the pilot pipes are arranged on both sides of the combined pipe body. The pilot pipe plays a guiding and limiting role for the guide pipe. The guide pipe can only be jacked along the extension direction of the pilot pipe, so the jacking direction of the combined pipe body is also guided and limited. At this time, there is no need to use high-precision excavation and jacking equipment and adjustment jacks. In this way, the forward direction of the jacking pipe group is guided and limited, solving the problem of difficulty in adjusting the direction of the jacking pipe group.

[0010] Further, in step S03, during the process of excavating and pushing forward the combined pipe body, the first pilot pipe and the second pilot pipe are pushed out of the soil layer by the first guide pipe and the second guide pipe.

[0011] Furthermore, the pilot pipe is a single circular top pipe.

[0012] Furthermore, at least one of the first guide tube and the second guide tube is movably connected to the jacking pipe group.

[0013] Furthermore, the guide pipe and the jacking pipe group are movably connected, meaning that there is a movable gap between the guide pipe and the jacking pipe group, and the jacking pipe group can slide along the guide pipe in the excavation direction.

[0014] Furthermore, the diameter of the guide tube is smaller than the diameter of the corresponding pilot tube.

[0015] Furthermore, a fan-shaped notch is provided at a position of the guide tube corresponding to the excavation cutter disc, and the size of the fan-shaped notch is larger than the overlapping size of the excavation cutter disc and the guide tube to meet the rotation requirement of the excavation cutter disc.

[0016] Furthermore, the excavation cutter disc does not exceed the front end of the guide tube along the excavation direction.

[0017] Furthermore, N combined pipe bodies are excavated and pushed into the soil layer at the outer edge of the tunnel to form a main structure at the outer edge of the tunnel, where N is a positive integer.

[0018] Furthermore, the direction in which the N combined pipe bodies are excavated and jacked in sequence extends along one end of a guide pipe movably connected to the jacking pipe group.

[0019] Furthermore, the jacking pipe groups are provided with connection structures on both sides along the outer edge contour direction of the tunnel, and the connection structures are used to connect adjacent jacking pipe groups together.

[0020] Furthermore, in order to push N combined pipe bodies in sequence, the following steps are also included after step S03:

[0021] Step S04: Pushing the n+1th pilot pipe: The nth combined pipe body corresponds to the n+1th pilot pipe along the planned excavation direction, and the n+1th pilot pipe is pushed into the target position according to the preset distance;

[0022] Step S05: Assembling the nth combined pipe body: assembling the nth combined pipe body according to the shape of the area to be excavated between the n-1th combined pipe body and the n+1th pilot pipe, the 2n-1th guide pipe and the 2nth guide pipe are arranged at both ends of the nth combined pipe body, the nth jacking pipe group is connected between the 2n-1th guide pipe and the 2nth guide pipe, and the nth jacking pipe group is provided with an excavation cutter disc on the side close to the area to be excavated;

[0023] Step S06: excavate and jack up the nth combined pipe body: the 2n-1th guide pipe of the nth combined pipe body corresponds to the 2n-2th guide pipe in the n-1th combined pipe, the 2n-2th guide pipe serves as a limiting and guiding role for the 2n-1th guide pipe, and the n+1th guide pipe serves as a limiting and guiding role for the 2nth guide pipe. The nth combined pipe body is excavated and jacked forward using excavation and jacking equipment, wherein 2≤n≤N, and n is a positive integer.

[0024] Furthermore, in step S06, the 2n-1th guide pipe is movably connected to the n-1th jacking pipe group.

[0025] Further, in the step S06, the 2n-2th guide pipe and the n+1th pilot pipe are pushed out of the soil layer by the 2n-1th guide pipe and the 2nth guide pipe in the nth combined pipe body.

[0026] Furthermore, for the annular tunnel, a movable connection structure is provided at the position of the first guide pipe corresponding to the Nth jacking pipe group, and no guide pipe is provided at the position of the Nth combined pipe body corresponding to the first guide pipe, and a section of the Nth combined pipe body close to the first guide pipe is pushed forward along the movable connection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a construction method for oriented construction of a bite-type jacking pipe group provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of jacking the first and second pilot pipes in a construction method for oriented construction of an interlocking jacking pipe group provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of the structure of a combined pipe body in a method for directional construction of a bite-type jacking pipe group provided in an embodiment of the present application (the movable connection is a slide groove);

[0030] Figure 4A schematic diagram of the structure of a combined pipe body in a method for directional construction of a bite-jointed jacking pipe group provided in an embodiment of the present application (the movable connection is an open structure);

[0031] Figure 5 A schematic diagram of providing an arc groove at a position of a guide pipe corresponding to an excavation cutter disc in a construction method for oriented construction of a bite-type jacking pipe group provided in an embodiment of the present application;

[0032] Figure 6 A schematic diagram of jacking a subsequent pilot pipe in a construction method for oriented construction of a bite-type jacking pipe group provided in an embodiment of the present application;

[0033] Figure 7 A schematic diagram of the process of excavating and jacking N combined pipe bodies in a directional construction method for a bite-jacking pipe group construction provided in an embodiment of the present application;

[0034] Figure 8 A schematic diagram of excavating and jacking two jacking pipe groups in a directional construction method for an interlocking jacking pipe group construction provided in an embodiment of the present application.

[0035] Reference numerals:

[0036] 1-pilot tube; 11-first pilot tube; 12-second pilot tube; 2-guide tube; 21-first guide tube; 22-second guide tube; 23-third guide tube; 24-fourth guide tube; 3-top tube group; 31-first top tube group; 32-second top tube group; 4-movable connection structure; 41-arc slide groove; 42-opening structure. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the specific technical solution of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0038] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.

[0039] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left" and "right" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to the changes in the orientation of the components in the drawings.

[0040] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0041] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0042] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0043] The embodiment of the present application provides a construction method for the orientation of the interlocking jacking pipe group construction, which is used for the orientation of the interlocking jacking pipe group during excavation and jacking. The interlocking jacking pipe group is one of the pipe curtain structures commonly used in tunnel excavation, and is a form of connecting multiple jacking pipes together. The outer edge contour of the tunnel to be excavated is divided into multiple excavation areas, and the jacking pipe group can be adaptively assembled according to the shape of each excavation area. The jacking pipe group can form an arc structure or a straight structure according to the shape of the outer edge contour of the tunnel to be excavated. An excavation cutter disc is set at one end of the jacking pipe group facing the soil layer to be excavated, and the jacking pipe group can be pushed into the soil layer. At present, the jacking direction of the jacking pipe group is often adjusted by adding a direction adjustment jack between the cutter disc and the jacking pipe. However, the adjustment of the jacking direction of the non-linear jacking pipe group involves the coordination and displacement distribution of multiple direction adjustment jacks, and the adjustment is very difficult.

[0044] In view of this, the present application embodiment provides a method for oriented construction of a bite-jointed jacking pipe group. Figure 1 , including the following steps:

[0045] Step S01: Pushing in a pilot pipe: excavating and pushing in two pilot pipes at both ends of a preset distance from the soil layer to be excavated, which are a first pilot pipe and a second pilot pipe.

[0046] According to the outer edge contour of the tunnel to be excavated, the soil layer corresponding to the outer edge contour of the tunnel is divided into multiple excavation areas. Two pilot pipes are excavated and jacked at both ends of each excavation area at a preset distance using excavation and jacking equipment. For the convenience of distinction, the two pilot pipes are divided into the first pilot pipe and the second pilot pipe. Figure 2 , which is a schematic diagram of pushing in the first pilot pipe 11 and the second pilot pipe 12 at both ends of a preset distance.

[0047] Step S02: Assembling the combined pipe body: Assembling the combined pipe body according to the shape of the area to be excavated between the first pilot pipe and the second pilot pipe, referring to Figure 3 A combined pipe body includes guide pipes 2 at both ends and a top pipe group 3 in the middle. For the convenience of distinction, the guide pipes in the first combined pipe body are divided into a first guide pipe 21 and a second guide pipe 22. The first guide pipe 21 corresponds to the first pilot pipe 11, and the second guide pipe 22 corresponds to the second pilot pipe 12. In addition, an excavation cutter disc is provided at one end of the top pipe group 3 close to the pilot pipe 1.

[0048] Step S03: Push the combined pipe body forward: the first pilot pipe 11 guides and limits the first guide pipe 21, the second pilot pipe 12 guides and limits the second guide pipe 22, and the combined pipe body is pushed forward by excavation and pushing equipment along the extension direction of the tunnel.

[0049] Specifically, the first guide pipe 21 is pushed forward along the first pilot pipe 11, and the pushing path of the first guide pipe 21 coincides with the first pilot pipe 11; the second guide pipe 22 is pushed forward along the first pilot pipe 12, and the pushing path of the second guide pipe 22 coincides with the second pilot pipe 12. In this way, the guide pipe 2 in the combined pipe body advances against the pilot pipe 1 that has been pushed into the soil layer, and the jacking pipe group 3 uses the excavation cutter head arranged at its front end to excavate and push forward. In this way, the combined pipe body is pushed forward as a whole, and the pilot pipe 1 orients the pushing direction of the jacking pipe group, thereby solving the problem of difficulty in adjusting the direction of the jacking pipe group.

[0050] It should be noted that since the advancement paths of the first guide tube 21 and the first pilot tube 11 coincide, and the advancement paths of the second guide tube 22 and the second pilot tube 12 coincide, in the process of the combined pipe body being advanced forward as a whole, the first pilot tube 11 and the second pilot tube 12 are pushed out of the soil layer by the first guide tube 21 and the second guide tube 22 respectively.

[0051] On this basis, the pilot pipe 1 is a single circular jacking pipe. In step S01, the first pilot pipe 11 and the second pilot pipe 12 are provided with corresponding excavation cutter discs at one end close to the excavated soil layer, and the size of the excavation cutter disc matches the size of the pilot pipe 1, so that the pilot pipe 1 can be pushed into the soil layer.

[0052] In order to ensure that the combined pipe body is pushed forward and to compensate for the defects caused by construction errors, at least one of the guide pipes on both sides of the jacking pipe group is movably connected to the jacking pipe group. Setting the guide pipe and the jacking pipe group to be movably connected is also conducive to the implementation of subsequent steps. There are many ways of movably connecting, which are not limited in the embodiments of the present application.

[0053] On this basis, as long as there is a movable gap between the jacking pipe group and the guide pipe where they can move relative to each other, and the jacking pipe group can slide along the guide pipe in the excavation direction, it will be sufficient. Figure 3 On the side of the guide pipe close to the top pipe group, an arc-shaped slide groove 41 corresponding to the top pipe group is provided. The size of the arc-shaped slide groove 41 is slightly larger than the position where the top pipe group 3 and the arc-shaped slide groove 41 overlap, so that the top pipe group 3 can move along the arc-shaped slide groove 41 and slide in the excavation direction. Figure 4 , is a schematic diagram of another way of active connection between the jacking pipe group 3 and the guide pipe 2. Specifically, an opening structure 42 is provided at the position on the guide pipe 2 connected to the jacking pipe group 3, a part of the jacking pipe group 3 extends into the opening structure 42 of the guide pipe 2, and the opening of the opening structure 42 provided on the guide pipe 2 is slightly larger than the part of the jacking pipe group 3 extending into the opening structure 42. Such an arrangement can also allow a movable gap to exist between the jacking pipe group 3 and the guide pipe 2, and the jacking pipe group 3 can slide along the guide pipe 2 in the excavation direction.

[0054] In order to prevent the guide pipe 2 from being unable to push forward along the pilot pipe 1, the diameter of the guide pipe 2 must be less than or equal to the diameter of the corresponding pilot pipe 1, so that the guide pipe 2 can smoothly push the pilot pipe 1 into the excavated soil layer.

[0055] Furthermore, since an excavation cutter disc is provided at the front end of the top pipe group 3, and there is an overlapping portion at the connection position of the top pipe group 3 and the guide pipe 2, Figure 5 In order to avoid the collision between the excavation cutter disc and the guide tube 2, a fan-shaped notch 5 is provided on the guide tube 2 at the position corresponding to the excavation cutter disc, and the size of the fan-shaped notch 5 is larger than the overlapping size of the excavation cutter disc and the guide tube 2, so as not to affect the rotation of the excavation cutter disc.

[0056] On this basis, the excavation cutter disc arranged at the front end of the jacking pipe group 3 does not exceed the front end of the guide pipe 2 in the excavation direction, so that the guide pipe 2 can be easily contacted with the pilot pipe 1, so that the guide pipe 2 can be smoothly pushed forward under the guidance and limitation of the pilot pipe 1. If the position of the excavation cutter disc exceeds the guide pipe 2, the excavation cutter disc will first contact the soil layer to be excavated. At this time, the guide pipe 2 has not yet entered the soil layer after the excavation of the pilot pipe 1. The pilot pipe 1 cannot play a guiding and limiting role, which may cause the guide pipe 2 and the pilot pipe 1 to be misaligned.

[0057] It should be noted that for tunnels with larger cross-sections, the soil layer corresponding to the main structure of the outer edge of the tunnel needs to be divided into N excavation areas, and N combined pipe bodies are set corresponding to each excavation area. The N combined pipe bodies are pushed into the soil layer at the outer edge of the tunnel in turn to form the main structure of the outer edge of the tunnel, where N is a positive integer.

[0058] On this basis, in order to facilitate continuous excavation of the excavation area, when determining the next excavation area, it is necessary to extend to the end where the guide pipe 2 is movably connected to the top pipe group 3. If the first top pipe group 3 is movably connected to the guide pipes 2 on both sides, the second excavation area can be extended to both sides of the first combined pipe body. For the subsequent combined pipe bodies, the side extending along the excavation direction is set as a movable connection structure, which facilitates the implementation of the subsequent steps.

[0059] It should be noted that in the combined pipe body, a connection structure is preset on one side of the top pipe group 3 extending outward, and the connection structure is used to fix the top pipe groups 3 in adjacent combined pipe bodies together. For example, a welding portion can be preset at the position corresponding to the adjacent top pipe groups 3, and the adjacent top pipe groups 3 are welded together by welding steel plates; a bolt connection portion can also be preset, and the adjacent top pipe groups 3 are connected together by tightening bolts, which is not limited in the embodiments of the present application.

[0060] For a large-section tunnel with N combined pipe bodies, in order to more vividly distinguish the pilot pipe 1, the guide pipe 2, and the jacking pipe group 3, the following explanation is required: For the jacking of the first combined pipe body, two pilot pipes 1 have been pushed into the soil layer in advance, namely the first pilot pipe 11 and the second pilot pipe 12. Guide pipes 2 are set on both sides of the first combined pipe body, corresponding to the first guide pipe 21, the second guide pipe 22 and the first jacking pipe group 31. Therefore, the first combined pipe body corresponds to: the first pilot pipe 11, the second pilot pipe 12, the first guide pipe 21, the second guide pipe 22 and the first jacking pipe group 31. When the second combined pipe body is to be pushed into the soil layer, the second guide pipe 22 in the first combined pipe body plays a guiding and limiting role, refer to Figure 6 , and then the third pilot tube 13 needs to be pushed in at a preset distance from the second pilot tube 12. The second combined tube body is provided with a third guide tube 23, a fourth guide tube 24 and a second top tube group 32. Therefore, the second combined tube body corresponds to: the third pilot tube 13, the third guide tube 23, the fourth guide tube 24 and the second top tube group 32. By analogy, the nth combined tube body corresponds to: the n+1th pilot tube, the 2n-1th guide tube, the 2nth guide tube and the nth top tube group. Among them, 2≤n≤N, and n is a positive integer.

[0061] In order to push N combined pipe bodies into the corresponding soil layer in sequence, push the nth combined pipe body into the corresponding soil layer in sequence, refer to Figure 7 , the specific steps are as follows:

[0062] Step S04: Pushing the n+1th pilot pipe: Pushing the n+1th pilot pipe into the target position of the soil layer to be excavated according to the preset distance. The n+1th pilot pipe and the corresponding guide pipe in the n-1th combined pipe body play a guiding and limiting role for the nth combined pipe body.

[0063] Step S05: Assembling the nth combined pipe body: Assembling the nth combined pipe body according to the shape of the planned excavation area corresponding to the nth combined pipe body, the combined pipe body is correspondingly provided with the 2n-1th guide pipe, the 2nth guide pipe and the nth jacking pipe group, and an excavation cutter disc is provided at one end of the nth jacking pipe group close to the planned excavation area.

[0064] Step S06: excavating and jacking the nth combined pipe body: the 2n-1th guide pipe in the nth combined pipe body corresponds to the adjacent guide pipe in the previous combined pipe body, that is, corresponds to the 2n-2th guide pipe in the n-1th combined pipe body. When jacking forward, the 2n-2th guide pipe plays a limiting and guiding role for the 2n-1th guide pipe; the 2nth guide pipe in the nth combined pipe body corresponds to the n+1th pilot pipe. When jacking forward, the n+1th pilot pipe plays a limiting and guiding role for the 2nth guide pipe. In this way, with the limiting and guiding role on both sides of the nth combined pipe body, the nth combined pipe body is excavated and jacked forward.

[0065] Starting from n=2, step S04, step S05 and step S06 are repeated until n=N, and all N combined pipe bodies are pushed into the preset position.

[0066] For example, refer to Figure 8 , which is a schematic diagram of excavating and jacking two jacking pipe groups in a directional construction method for interlocking jacking pipe groups provided in an embodiment of the present application.

[0067] It should be noted that, in order to enable the previous guide tube to play a limiting and guiding role for the subsequent combined pipe body, it is necessary to set the connection between the previous guide tube and the previous jacking pipe group as a movable connection, that is, in step S06, in the n-1th combined pipe body, the 2n-1th guide tube and the n-1th jacking pipe group are movably connected.

[0068] In step S06, since the 2n-2th guide tube and the n+1th pilot tube in the n-1th combined pipe body play a role in limiting and guiding the nth combined pipe body, the position of the 2n-2th guide tube coincides with the 2n-1th guide tube, and the position of the n+1th pilot tube coincides with the 2nth guide tube. Therefore, in the process of the nth combined pipe body advancing forward, the 2n-2th guide tube and the n+1th pilot tube are pushed out of the soil layer.

[0069] It should be noted that for tunnels with a circular outer edge contour, the Nth combined pipe body is connected to the first combined pipe body, so there is no need to set up a 2Nth guide pipe. It is only necessary to set a movable connection structure at the position of the first guide pipe corresponding to the Nth jacking pipe group, so that the Nth jacking pipe group can be pushed forward along the movable connection structure of the first guide pipe.

[0070] To sum up, in a construction method for directional construction of an interlocking jacking pipe group provided in an embodiment of the present application, a guide pipe and a guide pipe are used to limit and guide the jacking pipe group, which can well guide and limit the jacking pipe group, enable the jacking pipe group to be pushed forward in a predetermined direction, and solve the problem of difficulty in adjusting the direction of the jacking pipe group.

[0071] The serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for oriented construction of a group of interlocking jacking pipes, characterized in that: include: Step S01: Jacking the pilot pipe: excavating and jacking two pilot pipes at both ends of a preset distance, which are the first pilot pipe and the second pilot pipe; Step S02: Assembling the combined pipe body: assembling the combined pipe body according to the shape of the area to be excavated between the first pilot pipe and the second pilot pipe, the combined pipe body is provided with guide pipes at both ends of the combined pipe body, which are the first guide pipe and the second guide pipe respectively, the first guide pipe corresponds to the first pilot pipe, and the second guide pipe corresponds to the second pilot pipe; a jacking pipe group is connected between the first guide pipe and the second guide pipe, and the jacking pipe group is provided with an excavation cutter disc at one end close to the pilot pipe; Step S03: excavating and jacking the combined pipe body forward: the first pilot pipe guides and limits the first guide pipe, and the second pilot pipe guides and limits the second guide pipe, and the combined pipe body is excavated and jacked forward along the extension direction of the tunnel using excavation and jacking equipment; the guide pipe in the combined pipe body pushes forward against the pilot pipe that has been jacked into the soil layer, and the jacking pipe group uses the excavation cutter head arranged at its front end to excavate and jack forward.

2. The method for oriented construction of a group of interlocking jacking pipes according to claim 1, characterized in that: In the step S03, during the forward excavation and jacking process of the combined pipe body, the first pilot pipe and the second pilot pipe are pushed out of the soil layer by the first guide pipe and the second guide pipe.

3. The method for oriented construction of a group of interlocking jacking pipes according to claim 2, characterized in that: The pilot pipe is a single circular top pipe.

4. The method for oriented construction of a group of interlocking jacking pipes according to claim 3 is characterized in that: At least one of the first guide tube and the second guide tube is movably connected to the jacking pipe group.

5. The method for oriented construction of a group of interlocking jacking pipes according to claim 4, characterized in that: The movable connection means that there is a movable gap between the jacking pipe group and the guide pipe, and the jacking pipe group can slide along the guide pipe in the excavation direction.

6. The method for oriented construction of a group of interlocking jacking pipes according to claim 5, characterized in that: The diameter of the guide tube is smaller than or equal to the diameter of the corresponding pilot tube.

7. The method for oriented construction of a group of interlocking jacking pipes according to claim 6, characterized in that: The guide tube is provided with a fan-shaped notch at a position corresponding to the excavation cutter disc, and the size of the fan-shaped notch is larger than the overlapping size of the excavation cutter disc and the guide tube to meet the rotation requirement of the excavation cutter disc.

8. The method for oriented construction of a group of interlocking jacking pipes according to claim 7, characterized in that: The excavation cutter disc does not exceed the front end of the guide tube along the excavation direction.

9. The method for oriented construction of a group of interlocking jacking pipes according to claim 8, characterized in that: N of the combined pipe bodies are excavated and pushed into the soil layer at the outer edge of the tunnel to form the main structure of the outer edge of the tunnel, wherein N is a positive integer.

10. The method for oriented construction of a group of interlocking jacking pipes according to claim 9, characterized in that: The excavation direction of the soil layers corresponding to the N combined pipe bodies extends along the side where the guide pipe is movably connected to the jacking pipe group.

11. The method for oriented construction of a group of interlocking jacking pipes according to claim 10, characterized in that: The jacking pipe group is provided with connection structures on both sides along the outer edge contour direction of the tunnel, and the connection structures are used to connect the jacking pipe groups in adjacent combined pipe bodies together.

12. The method for oriented construction of a group of interlocking jacking pipes according to claim 11, characterized in that: In order to push N combined pipe bodies in sequence, the following steps are also included after step S03: Step S04: Pushing the n+1th pilot pipe: the nth combined pipe body corresponds to the n+1th pilot pipe along the planned excavation direction, and the n+1th pilot pipe is pushed into the target position according to a preset distance; Step S05: Assembling the nth combined pipe body: assembling the nth combined pipe body according to the shape of the area to be excavated between the n-1th combined pipe body and the n+1th pilot pipe, the 2n-1th guide pipe and the 2nth guide pipe are arranged at both ends of the nth combined pipe body, the nth jacking pipe group is connected between the 2n-1th guide pipe and the 2nth guide pipe, and the nth jacking pipe group is provided with the excavation cutter disc on the side close to the area to be excavated; Step S06: excavate and jack up the nth combined pipe body: the 2n-1th guide pipe of the nth combined pipe body corresponds to the 2n-2th guide pipe in the n-1th combined pipe, the 2n-2th guide pipe serves as a limit and guide for the 2n-1th guide pipe, and the n+1th guide pipe serves as a limit and guide for the 2nth guide pipe. The nth combined pipe body is excavated and jacked forward using excavation and jacking equipment, wherein 2≤n≤N, and n is a positive integer.

13. The method for oriented construction of a group of interlocking jacking pipes according to claim 12, characterized in that: In step S06, the 2n-1th guide pipe is movably connected to the n-1th jacking pipe group.

14. The method for oriented construction of a group of interlocking jacking pipes according to claim 13, characterized in that: In the step S06, the 2n-2th guide pipe and the n+1th guide pipe are pushed out of the soil layer by the 2n-1th guide pipe and the 2nth guide pipe in the nth combined pipe body.

15. The method for oriented construction of a group of interlocking jacking pipes according to claim 14, characterized in that: For an annular tunnel, a movable connection structure is provided at a position of the first guide pipe corresponding to the Nth jacking pipe group, and no guide pipe is provided at a position of the Nth combined pipe body corresponding to the first guide pipe, and an end of the Nth combined pipe body close to the first guide pipe is pushed forward along the movable connection structure.

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