Directional drilling and drawing pipe head for thermal insulation pipeline

Abstract

The utility model belongs to the field of buildings, and particularly relates to a directional drilling and drawing pipe head for a heat preservation pipeline, which comprises a dragging head, a core pipe end protector, an outer protection transition pipe and a fixer, the dragging head is fixedly arranged at one end of the core pipe end protector, and the other end of the core pipe end protector is provided with a first connector; a resistance reduction pipe cap is coaxially and fixedly arranged outside the core pipe end protector, the opening direction of the resistance reduction pipe cap faces the direction of the first connector arranged on the core pipe end protector, a second connector fixedly connected with the end of the outer protection transition pipe is arranged on the edge of the opening of the resistance reduction pipe cap, and the inner diameter of the outer protection transition pipe is larger than the outer diameter of the first connector. The end portion of the thermal insulation pipe can be protected in the process of pulling back the thermal insulation pipe, and meanwhile the situation that the integrity is affected due to the fact that friction force borne by a thermal insulation layer of the thermal insulation pipe is too large is prevented.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of building, in particular to a directional drilling pipe head for thermal insulation pipeline. BACKGROUND

[0002] When the heat pipe cannot be excavated through the municipal road, highway, river, railway and so on, the horizontal directional drilling construction technology is often used under the condition that the site meets the construction conditions. With the application of the horizontal directional drilling construction technology in more and more heat pipe projects, a good solution is provided for the construction area that cannot be excavated.

[0003] The heat pipe for horizontal directional drilling construction needs to use a prefabricated direct-buried thermal insulation pipe. The prefabricated direct-buried thermal insulation pipe includes a core pipe and an outer protective pipe. The outer peripheral surface of the core pipe is provided with the outer protective pipe. The outer protective pipe is made of high-density polyethylene. A thermal insulation layer is arranged between the core pipe and the outer protective pipe. In the back-dragging process, in order to make the prefabricated direct-buried thermal insulation pipe smoothly enter the hole, it is appropriate to use a crane to cooperate with the back-dragging of the prefabricated direct-buried thermal insulation pipe. The front end of the prefabricated direct-buried thermal insulation pipe to be penetrated is lifted by the crane, so that the prefabricated direct-buried thermal insulation pipe enters the hole gently. In the back-dragging process of the prefabricated direct-buried thermal insulation pipe, the polyethylene outer protective pipe of the prefabricated direct-buried thermal insulation pipe needs to be closely observed. The material of the thermal insulation layer of the prefabricated direct-buried thermal insulation pipe is high-density polyethylene, which cannot be directly welded and connected with the drag head. If the thermal insulation layer is not protected, the thermal insulation layer may be peeled off from the core pipe in the back-dragging process, thereby causing thermal insulation failure and corrosion and damage of the core pipe.

[0004] There are several technical problems in the conventional directional drilling pipe head method:

[0005] 1. The directional drilling pipe head acts on the core pipe, causing the friction force between the thermal insulation layer of the prefabricated direct-buried thermal insulation pipe and the hole to be too large, which affects the integrity of the thermal insulation.

[0006] 2. The cement mortar is easy to enter the thermal insulation layer of the prefabricated direct-buried thermal insulation pipe, which reduces the thermal insulation coefficient or requires a long damaged pipeline to be cut off, causing waste. CONTENT OF THE INVENTION

[0007] The purpose of the present application is mainly to solve the defects of the prior art. A directional drilling pipe head for thermal insulation pipeline is designed by adopting the mode that the core pipe end protector provided with a first connecting head cooperates with the outer protective transition pipe provided with a second connecting head. The end part of the thermal insulation pipe can be protected in the back-dragging process of the thermal insulation pipe, and the thermal insulation layer of the thermal insulation pipe is prevented from being affected by too large friction force and affecting the integrity.

[0008] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0009] A directional drilling and pulling head for insulated pipes includes a pulling head, a core tube end protector, an outer protective transition tube, and a fixing device. The pulling head is fixedly disposed at one end of the core tube end protector. The other end of the core tube end protector is provided with a first connector. A resistance-reducing cap is coaxially fixedly disposed on the outside of the core tube end protector. The opening direction of the resistance-reducing cap faces the direction in which the first connector is disposed on the core tube end protector. A second connector is provided on the edge of the opening of the resistance-reducing cap and is fixedly connected to the end of the outer protective transition tube. The inner diameter of the outer protective transition tube is larger than the outer diameter of the first connector.

[0010] Preferably, the core tube end protector is a cylindrical structure with one open end, the closed end of the core tube end protector is fixedly connected to the drag head, and the open end of the core tube end protector is provided with the first connector.

[0011] Preferably, the drag-reducing cap is a cylindrical structure with one end open, the core tube end protector is coaxially disposed on the inner bottom wall of the drag-reducing cap, and the pulling head extends out of the drag-reducing cap through the bottom wall from the direction opposite to the opening of the drag-reducing cap.

[0012] Preferably, the first connector is made of steel.

[0013] Preferably, both the second connector and the outer protective transition tube are made of steel.

[0014] Preferably, the second connector is an annular ring coaxially fixed on the opening edge of the resistance-reducing cap, and the outer diameter of the outer protective transition tube is equal to the outer diameter of the second connector.

[0015] Preferably, the fastener includes a bolt, and the outer protective transition tube has a radially provided threaded hole on its circumferential surface that mates with the bolt.

[0016] Compared with the prior art, this application has the following beneficial effects:

[0017] 1. This application adopts a core tube end protector with a first connector and an outer protective transition tube with a second connector to design a directional drilling and pulling head for insulated pipes. This head can protect the end of the insulated pipe during the pullback process and prevent the insulation layer of the insulated pipe from being subjected to excessive friction, which would affect its integrity.

[0018] 2. Since the outer protective pipe of the prefabricated direct-buried insulated pipe is made of high-density polyethylene, it cannot be connected to the second connector by welding. In this application, an outer protective transition pipe made of steel is used to cover the outer protective pipe to achieve welding between the outer protective pipe and the second connector. At the same time, the presence of the outer protective transition pipe prevents the outer protective pipe from rubbing against the channel during the pullback process, thereby avoiding damage to the insulation layer of the prefabricated direct-buried insulated pipe. Attached Figure Description

[0019] Fig. 1 This is a schematic diagram of the structure of this application;

[0020] Fig. 2 This is a schematic diagram illustrating the use of this application;

[0021] Fig. 3 This is a schematic diagram of a prefabricated direct-buried insulated pipe.

[0022] Among them, 1. Pull-out head; 2. Core tube protector; 3. Outer protective transition tube; 4. First connector; 5. Second connector; 6. Resistance-reducing cap; 7. Bolt; 8. Prefabricated direct-buried insulated pipe; 9. Core tube; 10. Outer protective tube. Detailed Implementation

[0023] like Figs. 1-3 As shown, a directional drilling and pulling head for insulated pipes includes a pulling head 1, a core tube end protector 2, an outer protective transition tube 3, and a fixing device. The pulling head 1 is fixedly disposed at one end of the core tube end protector 2, and the other end of the core tube end protector 2 is provided with a first connector 4. A resistance-reducing cap 6 is coaxially fixedly disposed on the outside of the core tube end protector 2. The opening direction of the resistance-reducing cap 6 faces the direction in which the first connector 4 is disposed on the core tube end protector 2. A second connector 5 is provided on the edge of the opening of the resistance-reducing cap 6 and is fixedly connected to the end of the outer protective transition tube 3. The inner diameter of the outer protective transition tube 3 is larger than the outer diameter of the first connector 4.

[0024] In this embodiment, when in use, the first connector 4 is first connected to one end of the core tube 9 of the prefabricated direct-buried insulation pipe 8, and then the outer protective transition pipe 3 is coaxially sleeved on the outer protective pipe of the prefabricated direct-buried insulation pipe 8. Then, the outer protective pipe 10 and the outer protective transition pipe 3 are fixed together by the fixing device. Then, the second connector 5 is used to connect the end of the outer protective transition pipe 3 facing the towing head 1. In this way, when dragging, the entire prefabricated direct-buried insulation pipe 8 can be pulled by pulling the towing head 1. Because the core tube end protector 2 is used, the end of the core tube 9 is protected, preventing cement mortar from entering the core tube 9 during the pullback process. At the same time, since the resistance-reducing cap 6 is only open at one end connected to the outer protective transition pipe 3, the resistance-reducing cap 6 can prevent cement mortar from entering the outer protective pipe 10 (that is, entering the insulation layer of the prefabricated direct-buried insulated pipe 8) during the pullback process. This solves the problem of how to prevent cement mortar from entering the insulation layer of the prefabricated direct-buried insulated pipe, reducing the insulation coefficient, or requiring the cutting of a long damaged pipe, resulting in waste. The outer protective transition pipe 3 can protect the outer protective pipe 10, thereby reducing the friction between the outer protective pipe 10 and the channel and ensuring the integrity of the insulation layer.

[0025] As a preferred embodiment, the core tube end protector 2 is a cylindrical structure with one open end. This cylindrical structure saves materials compared to a solid one. The closed end of the core tube end protector 2 is fixedly connected to the drag head 1, and the open end of the core tube end protector 2 is provided with the first connector 4.

[0026] As a preferred embodiment, the drag-reducing cap 6 is a cylindrical structure with one open end. The core tube end protector 2 is coaxially mounted on the inner bottom wall of the drag-reducing cap 6. The pulling head 1 extends through the bottom wall of the drag-reducing cap 6 from the direction opposite to the opening of the cap 6, thus extending outside the cap 6. This arrangement of the drag-reducing cap 6 allows the core tube end protector 2 to be located inside the cap 6, reducing the overall size of the device. The closed end of the drag-reducing cap 6 is a convex arc shape, which reduces resistance during the dragging of the prefabricated direct-buried insulated pipe 8. Similarly, the end of the core tube end protector 2 facing the pulling head 1 is also a convex arc shape, again to reduce resistance during the dragging of the prefabricated direct-buried insulated pipe 8.

[0027] As a preferred embodiment, the first connector 4 is made of steel. This steel construction allows the first connector 4 to be welded to the core tube 9 of the prefabricated direct-buried insulation pipe 8 during connection. Since the core tube 9 is also made of steel, the weld is strong. After being pulled back into place, the first connector 4 can be cut off from the core tube 9. The first connector 4 is essentially a ring with an opening radius equal to that of the core tube end protector 2, and it can be integrally formed with the core tube end protector 2.

[0028] As a preferred embodiment, both the second connector 5 and the outer protective transition pipe 3 are made of steel. This arrangement facilitates a secure connection between the second connector 5 and the outer protective transition pipe 3 via welding. After the prefabricated direct-buried insulated pipe 8 is pulled back into place, the weld between the second connector 5 and the outer protective transition pipe 3 is first removed, followed by the weld between the first connector 4 and the core pipe 9. However, before the pullback, the first connector 4 is welded to the core pipe 9, and then the outer protective transition pipe 3 is fitted onto the outer protective pipe 10 before the second connector 5 and the outer protective transition pipe 3 are welded together.

[0029] As a preferred embodiment, the second connector 5 is an annular ring coaxially fixed on the opening edge of the resistance-reducing cap 6, and the outer diameter of the outer protective transition tube 3 is equal to the outer diameter of the second connector 5. This annular design facilitates welding of the second connector 5 to the outer protective transition tube 3.

[0030] As a preferred embodiment, the fastener includes a bolt 7, and the outer protective transition tube 3 has radially arranged threaded holes on its circumferential surface that mate with the bolt 7. With this configuration, after the outer protective transition tube 3 is fitted onto the outer protective tube 10, tightening the bolt 7 secures the pre-insulated direct-buried pipe 8 and the outer protective transition tube 3 together. After the bolt 7 is screwed in, a portion will penetrate the outer protective transition tube 3 and enter the insulation layer of the pre-insulated direct-buried pipe 8, without damaging the insulation layer. However, the fastener design is not limited to using bolts 7; for example, using driven pins can also secure the pre-insulated direct-buried pipe 8 and the outer protective transition tube 3 together. Since the outer protective pipe 10 is made of high-density polyethylene, it cannot be connected to the second connector 5 by welding. Therefore, an outer protective transition pipe 3 made of steel is required to be sleeved on the outer protective pipe 10 to achieve welding between the prefabricated direct-buried insulated pipe 8 and the second connector 5. At the same time, the presence of the outer protective transition pipe 3 prevents the outer protective pipe 10 from rubbing against the channel during the pullback process, thereby avoiding damage to the insulation layer of the prefabricated direct-buried insulated pipe 8.

Claims

1. A directional drilling and pipe pulling head for insulated pipes, characterized in that, The device includes a pull head (1), a core tube end protector (2), an outer protective transition tube (3), and a fixing device. The pull head (1) is fixedly installed at one end of the core tube end protector (2). The other end of the core tube end protector (2) is provided with a first connector (4). A drag-reducing cap (6) is coaxially fixed on the outside of the core tube end protector (2). The opening direction of the drag-reducing cap (6) faces the direction in which the first connector (4) is installed on the core tube end protector (2). A second connector (5) is provided on the edge of the opening of the drag-reducing cap (6) and is fixedly connected to the end of the outer protective transition tube (3). The inner diameter of the outer protective transition tube (3) is larger than the outer diameter of the first connector (4).

2. The directional drilling and pipe pulling head for insulated pipes according to claim 1, characterized in that, The core tube end protector (2) is a cylindrical structure with one open end. The closed end of the core tube end protector (2) is fixedly connected to the drag head (1), and the open end of the core tube end protector (2) is provided with the first connector (4).

3. A directional drilling and pipe pulling head for insulated pipes according to claim 1, characterized in that, The drag-reducing cap (6) is a cylindrical structure with one end open. The core tube end protector (2) is coaxially mounted on the inner bottom wall of the drag-reducing cap (6). The drag head (1) extends out of the drag-reducing cap (6) from the direction opposite to the opening of the drag-reducing cap (6) through the bottom wall of the drag-reducing cap (6).

4. A directional drilling and pipe pulling head for insulated pipes according to claim 1, characterized in that, The first connector (4) is made of steel.

5. A directional drilling and pipe pulling head for insulated pipes according to claim 1, characterized in that, The second connector (5) and the outer protective transition tube (3) are both made of steel.

6. A directional drilling and pipe pulling head for insulated pipes according to claim 5, characterized in that, The second connector (5) is an annular ring coaxially fixed on the opening edge of the resistance-reducing cap (6), and the outer diameter of the outer protective transition tube (3) is equal to the outer diameter of the second connector (5).

7. A directional drilling and pipe pulling head for insulated pipes according to claim 1, characterized in that, The fastener includes a bolt (7), and the outer protective transition tube (3) has a screw hole on its circumferential surface that mates with the bolt (7).

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