Construction method for assisting dragging of reinforcement cage and horizontal directional drilling of flexible pipeline

Abstract

The invention discloses an auxiliary dragging reinforcement cage and a horizontal directional drilling flexible pipeline construction method.The auxiliary dragging reinforcement cage is used in cooperation with a flexible pipeline and a horizontal directional drill and comprises a reinforcement cage body part and a reinforcement cage head part arranged at the head end of the reinforcement cage body part, the reinforcement cage body part is in a cylindrical shape, and the reinforcement cage head part is arranged at the head end of the reinforcement cage body part; the reinforcement cage head is in a conical shape, an opening allowing the flexible pipeline to be inserted is formed in the tail end of the reinforcement cage body, and a containing space for containing the flexible pipeline is formed in the reinforcement cage body and the reinforcement cage head. In the construction process of horizontal directional drilling of the flexible pipeline, friction force and traction force acting on the flexible pipeline are reduced, and the dragging length of the flexible pipeline in one-time construction is increased.

Description

Technical Field

[0001] The invention relates to the technical field of municipal engineering and water conservancy engineering, and in particular to a construction method of an auxiliary dragging steel cage and a horizontal directional drilling flexible pipeline. Background Art

[0002] Horizontal directional drilling construction is a trenchless construction method. It is a construction process that uses horizontal directional drilling equipment to drill pipelines without excavating the surface layer, and can cross rivers, lakes, and above-ground and underground buildings (structures). It effectively reduces the impact of construction on the surrounding environment and buildings, and minimizes the interference of construction on residents' lives and traffic. It has the comprehensive functions of economy, efficiency, and environmental protection. The advantages of this technology are that it does not dig the ground; it does not demolish, does not damage ground buildings; it does not damage the environment; it does not affect the segment deformation of the pipeline; it is time-saving, efficient, safe, and has a low overall cost. It is widely used in the construction of municipal and water conservancy projects for the trenchless laying of various pipelines. The construction method of horizontal directional drilling is one of the most widely used methods.

[0003] However, in the actual construction process, the current horizontal directional drilling flexible pipeline dragging length is about 500m. When encountering large-span water areas and above-ground and underground buildings (structures), it is necessary to add working wells and receiving wells, which will not only increase the construction difficulty, but also increase the cost and extend the construction period.

[0004] The above problems need to be solved urgently. Summary of the invention

[0005] In order to overcome the problem of insufficient length of the dragged flexible pipeline in the horizontal directional drilling flexible pipeline construction in the prior art, the present invention provides an auxiliary dragging steel cage and a horizontal directional drilling flexible pipeline construction method.

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

[0007] In a first aspect, the present invention provides an auxiliary dragging steel cage for use in conjunction with a flexible pipe and a horizontal directional drill, comprising: a steel cage main body and a steel cage head disposed at the head end of the steel cage main body, the steel cage main body being cylindrical, the steel cage head being conical, an opening for inserting the flexible pipe being provided at the tail end of the steel cage main body, and a receiving space for receiving the flexible pipe being formed inside the steel cage main body and the steel cage head.

[0008] As a preferred embodiment of the present invention, the main body of the steel cage includes a plurality of annular steel bars arranged at intervals along the length direction of the main body of the steel cage and a plurality of first straight steel bars arranged along the outer circumference of the annular steel bars, and all of the annular steel bars are welded and fixed to each of the first straight steel bars.

[0009] As a preferred embodiment of the present invention, the steel cage head includes a plurality of circumferentially arranged second straight steel bars, the number of the second straight steel bars is the same as the number of the first straight steel bars, one ends of the plurality of second straight steel bars are welded at one point, and the other ends of the plurality of second straight steel bars are respectively welded and fixed to a corresponding one of the first straight steel bars.

[0010] As a preferred solution of the present invention, the annular steel bar is a round steel bar with a diameter of 6mm-12mm, the first straight steel bar is a round steel bar with a diameter of 6mm-12mm, and the second straight steel bar is a round steel bar with a diameter of 8mm-12mm.

[0011] As a preferred solution of the present invention, the annular steel bars are arranged at intervals of 200mm-500mm, and the first straight steel bars are arranged at intervals of 200mm-500mm.

[0012] As a preferred solution of the present invention, the inner diameter of the annular steel bar is 20 mm-30 mm larger than the outer diameter of the flexible pipe.

[0013] As a preferred solution of the present invention, the steel cage head is connected to the head end of the flexible pipe through a U-shaped buckle, and the steel cage head is connected to the rotating shaft of the horizontal directional drill through a U-shaped buckle.

[0014] In a second aspect, the present invention provides a horizontal directional drilling flexible pipeline construction method, comprising the following steps:

[0015] Step S1, according to the construction span and the positions of the working well and the receiving well, determine the position, depth and length of the pipeline, and then determine the length of the auxiliary dragging steel cage and the steel bar model used as described in any of the above solutions;

[0016] Step S2: Drilling a hole along the axis line with a horizontal directional drill according to the drawing requirements;

[0017] Step S3, manufacturing a flexible pipe and the auxiliary pulling steel cage, wherein the head end of the flexible pipe is conical;

[0018] Step S4, placing the flexible pipe inside the auxiliary traction steel cage, and connecting the head end of the flexible pipe and the rotating shaft of the horizontal directional drill to the steel cage head of the auxiliary traction steel cage;

[0019] Step S5, the horizontal directional drill drags the auxiliary dragging steel cage along the drilled hole, and the traction force acts on the head of the steel cage during operation.

[0020] As a preferred embodiment of the present invention, in step S4, after the flexible pipe is placed inside the auxiliary dragging steel cage, the head end of the flexible pipe is connected to the head of the steel cage through a U-shaped buckle; the rotating shaft of the horizontal directional drill is connected to the head of the steel cage through a U-shaped buckle.

[0021] As a preferred solution of the present invention, the head end of the flexible pipe is closed by a pipe conical head, and the pipe conical head, the steel cage head and the end of the rotating shaft of the horizontal directional drill are all welded with a perforated steel plate that cooperates with the U-shaped buckle.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The auxiliary dragging steel cage provided by the present invention reduces the friction and traction acting on the flexible pipeline during the horizontal directional drilling flexible pipeline construction process; when the horizontal directional drilling is carried out for a long length of construction, the auxiliary dragging steel cage can be used to increase the dragging length of the flexible pipeline in one construction, so that the number of working wells and receiving wells in the construction process can be correspondingly reduced, which helps to reduce the construction difficulty, ensure the construction period, save costs, and reduce the damage to the ecological environment;

[0024] 2. The horizontal directional drilling flexible pipeline construction method provided by the present invention can increase the one-time dragging length to more than 1000m, and after one-time dragging length is completed, the auxiliary dragging steel cage can be pulled out of the hole or left in the hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the structure of connecting the auxiliary dragging steel cage with the flexible pipe and the rotating shaft of the horizontal directional drill in one embodiment of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the auxiliary dragging steel cage in one embodiment of the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of a flexible pipe in one embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the structure of a U-shaped buckle in one embodiment of the present invention.

[0030] In the figure,

[0031] 1. Steel cage main body; 11. Annular steel bar; 12. First straight steel bar; 2. Steel cage head; 21. Second straight steel bar; 3. Flexible pipe; 31. Pipe conical head; 4. Rotating shaft; 5. U-shaped buckle. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. It is also stated that the embodiments described below are only used to explain the present invention and are not used to limit the present invention.

[0033] It should be noted that the terms "install", "set", "connect", "fix" and the like should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected or electrically connected; they can be directly connected, or indirectly connected through an intermediate medium, or they can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. The indication of orientation or position relationship is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the application product is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art, or the orientation or position relationship in which the application product is usually placed when in use. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first" and "second" are only used for the purpose of convenience of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple roots" means two or more roots, unless otherwise clearly defined.

[0034] Example 1

[0035] See also Figures 1 to 3The present embodiment provides an auxiliary dragging steel cage, which is used in the construction of horizontal directional drilling flexible pipelines in conjunction with a flexible pipeline 3 and a horizontal directional drill. The auxiliary dragging steel cage includes a steel cage main body 1 and a steel cage head 2 arranged at the head end of the steel cage main body 1. The steel cage main body 1 is cylindrical, which is convenient for placing the flexible pipeline 3 inside the auxiliary dragging steel cage. The steel cage head 2 is conical to reduce the resistance generated by the head end of the auxiliary dragging steel cage during dragging. An opening for inserting the flexible pipeline 3 is provided at the tail end of the steel cage main body 1, and the steel cage main body 1 and the steel cage head 2 form a receiving space for receiving the flexible pipeline 3. During operation, the flexible pipeline 3 is placed in the receiving space of the auxiliary dragging steel cage, and the steel cage head 2 is connected to the head end of the flexible pipeline 3 and the rotating shaft 4 of the horizontal directional drill, so that the dragging traction force acts on the head end of the auxiliary dragging steel cage, and the auxiliary dragging steel cage carries the flexible pipeline 3 to move along the designated channel, while reducing the friction of the channel on the flexible pipeline 3.

[0036] The auxiliary dragging steel cage provided by the present invention reduces the friction and traction acting on the flexible pipe 3 during the horizontal directional drilling flexible pipe construction process; when the horizontal directional drilling is carried out for a longer length of construction, the auxiliary dragging steel cage can be used to increase the dragging length of the flexible pipe 3 in one construction, thereby correspondingly reducing the number of working wells and receiving wells in the construction process, helping to reduce the difficulty of construction, ensure the construction period, save costs, and reduce damage to the ecological environment.

[0037] See also Figure 2 In one embodiment, the main body 1 of the steel cage includes a plurality of annular steel bars 11 arranged at intervals along the length direction of the main body 1 of the steel cage and a plurality of first straight steel bars 12 arranged along the outer circumference of the annular steel bars 11, and all the annular steel bars 11 are welded and fixed to each first straight steel bar 12. The annular steel bars 11 arranged at intervals along the length direction of the main body 1 of the steel cage provide longitudinal support for the entire structure and enhance the overall stability; the first straight steel bars 12 arranged along the outer circumference of the annular steel bars 11 provide transverse support, and together with the annular steel bars 11, form a solid grid structure, further enhancing the strength and stability of the auxiliary traction steel cage. In addition, the grid-like structure makes the main body 1 of the steel cage easy to manufacture and assemble, and also convenient for installation and adjustment at the construction site. Since the welding between the annular steel bars 11 and the first straight steel bars 12 is flexible, the number of the annular steel bars 11 and the first straight steel bars 12 can be increased or decreased as needed to adapt to flexible pipes 3 of different lengths.

[0038] The steel cage head 2 includes a plurality of circumferentially arranged second straight steel bars 21, the number of which is the same as the number of the first straight steel bars 12, one end of each of the plurality of second straight steel bars 21 is welded at one point, and the other ends of each of the plurality of second straight steel bars 21 are respectively welded and fixed to a corresponding first straight steel bar 12. The steel cage head 2 is designed in a conical shape, which reduces the resistance generated by the auxiliary dragging steel cage head end during dragging, ensures a firm connection between the steel cage head 2 and the steel cage body 1, and enhances the stability of the overall structure.

[0039] In one embodiment, the annular reinforcement 11 is a round steel with a diameter of 6mm-12mm, and the annular reinforcement 11 is arranged at intervals of 200mm-500mm. The 6mm-12mm round steel as the annular reinforcement 11 provides sufficient strength and rigidity to support the entire reinforcement cage main body 1, which not only ensures the stability of the structure, but also avoids excessive material consumption. The spacing of 200mm-500mm ensures the interaction between the annular reinforcements 11, which neither increases the material cost due to being too dense, nor reduces the structural strength due to being too sparse.

[0040] In one embodiment, the first straight steel bars 12 are round steel bars with a diameter of 6 mm to 12 mm, and the first straight steel bars 12 are arranged at intervals of 200 mm to 500 mm. The 6 mm to 12 mm round steel bars as the first straight steel bars 12 form a solid grid structure together with the annular steel bars 11 to ensure the stability of the lateral support. The spacing of 200 mm to 500 mm ensures the interaction between the first straight steel bars 12 and the uniformity and integrity of the grid structure.

[0041] In one embodiment, the second straight steel bar 21 is a round steel bar with a diameter of 8 mm to 12 mm. The round steel bar with a diameter of 8 mm to 12 mm as the second straight steel bar 21 provides sufficient strength and rigidity to support the entire steel cage head 2, which not only ensures the stability of the structure, but also avoids excessive material consumption.

[0042] In one embodiment, the inner diameter of the annular steel bar 11 is 20mm-30mm larger than the outer diameter of the flexible pipe 3. This arrangement ensures that the flexible pipe 3 can be easily inserted into the accommodating space of the auxiliary traction steel cage, and there is enough space to avoid excessive friction with the auxiliary traction steel cage during the traction process, thereby protecting the flexible pipe 3 and improving the smoothness of the traction process.

[0043] See also Figure 1 , Figure 4In one embodiment, the steel cage head 2 is connected to the head end of the flexible pipe 3 through the U-shaped buckle 5. Through the U-shaped buckle 5, the steel cage head 2 and the head end of the flexible pipe 3 are firmly connected. This connection method is not only simple and easy, but also can effectively transmit the force during the dragging process, ensuring that the flexible pipe 3 and the auxiliary dragging steel cage move as a whole.

[0044] See also Figure 1 , Figure 4 In one embodiment, the steel cage head 2 is connected to the rotating shaft 4 of the horizontal directional drill through a U-shaped buckle 5. Through the U-shaped buckle 5, the steel cage head 2 is firmly connected to the rotating shaft 4 of the horizontal directional drill. This connection method is not only simple and easy, but also can effectively transmit the force during the dragging process, thereby guiding the flexible pipe 3 to be dragged along a predetermined trajectory.

[0045] Example 2

[0046] See also Figures 1 to 3 The present invention provides a horizontal directional drilling flexible pipeline construction method, which is applied to water areas, swamps, and above-ground and underground buildings (structures) with a large span, and comprises the following steps:

[0047] Step S1, according to the construction span (span of water area, swamp, above-ground and underground buildings (structures), the location of the working well and the receiving well, the construction plan and design requirements, etc., determine the location, depth and length of the pipeline, and then determine the length of the auxiliary dragging steel cage and the steel bar model used as described in Example 1, so as to reduce unnecessary material waste and ensure the safety of construction;

[0048] Step S2, horizontal directional drilling is used to drill a hole along the axis according to the drawing requirements, providing a stable path for the subsequent pulling of the flexible pipe 3 and the auxiliary pulling steel cage;

[0049] Step S3, manufacturing a flexible pipe 3 and an auxiliary dragging steel cage, and making the head ends of the flexible pipe 3 and the auxiliary dragging steel cage conical, the conical auxiliary dragging steel cage head end design can reduce the resistance during dragging;

[0050] Step S4, placing the flexible pipe 3 inside the auxiliary dragging steel cage, and connecting the head end of the flexible pipe 3 and the rotating shaft 4 of the horizontal directional drill with the steel cage head 2 of the auxiliary dragging steel cage;

[0051] Step S5, the horizontal directional drill drags the auxiliary drag steel cage along the drilled hole, and the traction force acts on the steel cage head 2 during operation, the auxiliary drag steel cage moves forward along the drilled hole, driving the flexible pipe 3 forward, and at the same time, most of the friction force generated in the hole is borne by the auxiliary drag steel cage, reducing the burden of the flexible pipe 3 during operation with a conventional horizontal directional drilling construction method, preventing the flexible pipe 3 from being broken, and increasing the length of one drag to reduce the number of working wells and receiving wells;

[0052] Step S6, after the construction is completed, the auxiliary dragging steel cage is pulled out of the hole or left in the hole according to needs; when the steel cage needs to be recovered, the connection between the flexible pipe 3 and the steel cage head 2 is released, and the connection between the rotating shaft 4 of the horizontal directional drill and the steel cage head 2 is retained. The horizontal directional drill continues to work and the auxiliary dragging steel cage is pulled out of the hole for reuse in other projects.

[0053] By adopting the above-mentioned horizontal directional drilling flexible pipeline construction method of the present invention, the one-time dragging length can be increased to more than 1000m, and after the one-time dragging length is completed, the auxiliary dragging steel cage can be pulled out of the hole or left in the hole.

[0054] See also Figure 2 In one embodiment, when manufacturing the auxiliary dragging steel cage, a plurality of annular steel bars 11 are arranged at intervals along the length direction of the steel cage main body 1, a plurality of first straight steel bars 12 are arranged along the outer circumferential direction of the annular steel bars 11, and all the annular steel bars 11 are welded and fixed to each first straight steel bar 12 to form the steel cage main body 1; one end of a plurality of second straight steel bars 21 is welded at one point, and the other ends of the plurality of second straight steel bars 21 are respectively welded and fixed to a corresponding first straight steel bar 12. Among them, the annular steel bars 11 are round steels with a diameter of 6mm-12mm, and the annular steel bars 11 are arranged at intervals of 200mm-500mm; the first straight steel bars 12 are round steels with a diameter of 6mm-12mm, and the first straight steel bars 12 are arranged at intervals of 200mm-500mm; the second straight steel bars 21 are round steels with a diameter of 8mm-12mm.

[0055] In one embodiment, the main body 1 of the steel cage is spliced ​​by several sections of steel cage, each section of the steel cage is 6000mm-1200mm long, and when it needs to be extended, the lap length of the first straight steel bar 12 is not less than 100mm-150mm. The main body 1 of the steel cage can be extended at will according to the length of the flexible pipe 3.

[0056] See also Figure 1 , Figure 4In one embodiment, in step S4, after the flexible pipe 3 is placed inside the auxiliary dragging steel cage, the head end of the flexible pipe 3 is connected to the steel cage head 2 through the U-shaped buckle 5; through the U-shaped buckle 5, the rotating shaft 4 of the horizontal directional drill and the steel cage head 2, the steel cage head 2 and the head end of the flexible pipe 3 are firmly connected. This connection method is not only simple and easy, but also can effectively transmit the force during the dragging process, ensuring that the flexible pipe 3 and the auxiliary dragging steel cage move as a whole, and guiding the flexible pipe 3 to be dragged along a predetermined trajectory.

[0057] See also Figure 3 In one embodiment, the head end of the flexible pipe 3 is closed by a pipe conical head 31, and the pipe conical head 31, the steel cage head 2 and the end of the rotating shaft 4 of the horizontal directional drill are all welded with a perforated steel plate (not shown in the figure, the same below) that matches the U-shaped buckle 5. The perforated steel plate provides a reliable fixing point for the U-shaped buckle 5. Through the cooperation of the U-shaped buckle 5 and the perforated steel plate, a stable connection structure is formed between the steel cage head 2 and the flexible pipe 3 and the rotating shaft 4 of the horizontal directional drill. This structure can withstand various forces during the dragging process and ensure the smooth progress of the construction process.

[0058] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

[0059] The above is an exemplary description of the present invention in conjunction with the accompanying drawings. It is obvious that the implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An auxiliary dragging steel cage, used in conjunction with a flexible pipe and a horizontal directional drill, characterized in that: include: A steel cage main body and a steel cage head portion arranged at the head end of the steel cage main body, the steel cage main body is cylindrical, the steel cage head portion is conical, an opening for inserting the flexible pipe is opened at the tail end of the steel cage main body, and the interiors of the steel cage main body and the steel cage head portion form a accommodating space for accommodating the flexible pipe.

2. The auxiliary pulling steel cage according to claim 1 is characterized in that: The main body of the steel cage includes a plurality of annular steel bars arranged at intervals along the length direction of the main body of the steel cage and a plurality of first straight steel bars arranged along the outer circumference of the annular steel bars. All the annular steel bars are welded and fixed to each of the first straight steel bars.

3. The auxiliary pulling steel cage according to claim 2 is characterized in that: The steel cage head includes a plurality of circumferentially arranged second straight steel bars, the number of the second straight steel bars is the same as the number of the first straight steel bars, one ends of the plurality of second straight steel bars are welded at one point, and the other ends of the plurality of second straight steel bars are respectively welded and fixed to a corresponding one of the first straight steel bars.

4. The auxiliary pulling steel cage according to claim 3 is characterized in that: The annular steel bar is a round steel bar with a diameter of 6mm-12mm, the first straight steel bar is a round steel bar with a diameter of 6mm-12mm, and the second straight steel bar is a round steel bar with a diameter of 8mm-12mm.

5. The auxiliary pulling steel cage according to claim 3 is characterized in that: The annular steel bars are arranged at intervals of 200mm-500mm, and the first straight steel bars are arranged at intervals of 200mm-500mm.

6. The auxiliary pulling steel cage according to claim 4, characterized in that: The inner diameter of the annular steel bar is 20 mm to 30 mm larger than the outer diameter of the flexible pipe.

7. The auxiliary pulling steel cage according to claim 1, characterized in that: The steel bar cage head is connected to the head end of the flexible pipe through a U-shaped buckle, and the steel bar cage head is connected to the rotating shaft of the horizontal directional drill through a U-shaped buckle.

8. A horizontal directional drilling flexible pipeline construction method, characterized in that: The following steps are involved: Step S1, determining the position, depth and length of the pipeline according to the construction span and the positions of the working well and the receiving well, and then determining the length of the auxiliary dragging steel cage as described in any one of claims 1 to 7 and the type of steel bars used; Step S2: Drilling a hole along the axis line with a horizontal directional drill according to the drawing requirements; Step S3, manufacturing a flexible pipe and the auxiliary pulling steel cage, wherein the head end of the flexible pipe is conical; Step S4, placing the flexible pipe inside the auxiliary traction steel cage, and connecting the head end of the flexible pipe and the rotating shaft of the horizontal directional drill to the steel cage head of the auxiliary traction steel cage; Step S5, the horizontal directional drill drags the auxiliary dragging steel cage along the drilled hole, and the traction force acts on the head of the steel cage during operation.

9. The horizontal directional drilling flexible pipeline construction method according to claim 8, characterized in that: In step S4, after the flexible pipe is placed inside the auxiliary dragging steel cage, the head end of the flexible pipe is connected to the head of the steel cage through a U-shaped buckle; the rotating shaft of the horizontal directional drill is connected to the head of the steel cage through the U-shaped buckle.

10. The horizontal directional drilling flexible pipeline construction method according to claim 9, characterized in that: The head end of the flexible pipe is closed by a pipe conical head, and the pipe conical head, the steel cage head and the end of the rotating shaft of the horizontal directional drill are all welded with a perforated steel plate that matches the U-shaped buckle.

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