Method of inserting geothermal heat exchanger into borehole

Abstract

To insert a geothermal heat exchanger safely into a borehole at an appropriate falling speed.SOLUTION: A brake-equipped winch 3 is attached to a lower end of a rod reducer 23 of a drilling head 21. A weight 6 is connected to a lower end of a third wire 25 of a winch 24 of a drilling machine 1, and is brought to a wellhead of a borehole 17. Next, as shown in insertion step 2 of FIG. 5, the weight 6 is clamped by a clamp 15 of the drilling machine 1, and the third wire 25 is disconnected from the weight 6. Next, the required number of additional weights 6 are connected to the weight 6 clamped by the clamp 15 to obtain the required weight.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a method for inserting a geothermal heat exchanger into a borehole, and more particularly to a method for inserting a geothermal heat exchanger into a borehole, the method being capable of safely and quickly inserting the geothermal heat exchanger into a borehole. [Background technology]

[0002] To make a geothermal heat exchange well, it is necessary to insert a geothermal heat exchanger (geothermal heat exchange pipe) made of polyethylene or the like into a borehole excavated by a drilling machine. However, if groundwater or bentonite is present in the borehole, the geothermal heat exchanger will float up and cannot be smoothly inserted into the borehole. For this reason, there is a well-known method (Patent Document 1) in which a weight is attached to the bottom end of the geothermal heat exchanger before insertion. This weight is buried in the ground. However, with the conventional method, the speed at which the geothermal heat exchanger is inserted into the borehole cannot be controlled, so there is a risk of the geothermal heat exchanger falling to the bottom of the borehole, and the post-processing of the fallen geothermal heat exchanger is a tedious task. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-2268 A Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention has been made in view of the above background, and has the following object: The object of the present invention is to provide a method for safely and quickly inserting an underground heat exchanger into a borehole. [Means for solving the problem]

[0005] In order to solve the above problems, the present invention takes the following measures. In other words, the method of inserting a geothermal heat exchanger into a borehole of the present invention 1 is a method of inserting a geothermal heat exchanger into a borehole formed in the ground to utilize geothermal heat, characterized in that a weight is hung from a first wire of a winch with a brake attached to the lower end of a drilling head that is arranged to be movable vertically on a drilling machine for forming the borehole, the weight is connected to the tip of the geothermal heat exchanger by a second wire, and the winch with a brake is started to simultaneously insert the weight and the geothermal heat exchanger into the borehole while applying the brake.

[0006] The method of inserting a geothermal heat exchanger into a borehole of the present invention 2 is characterized in that, in the method of the present invention 1, the weight is hoisted by a third wire of a winch of the drilling machine and carried into the well mouth of the borehole, the weight is clamped by a clamp of the drilling machine, the third wire is removed from the weight, and then the weight is connected to the first wire of the brake winch. The method of inserting a geothermal heat exchanger into a borehole of the present invention 3 is characterized in that, in the present invention 2, a pulley for the geothermal heat exchanger is hoisted with a third wire of the winch of the drilling machine, the geothermal heat exchanger is hung on the pulley for the geothermal heat exchanger, and the tip of the geothermal heat exchanger is transported to the well mouth of the borehole. The method for inserting a geothermal heat exchanger into a borehole according to the fourth aspect of the present invention is characterized in that in the third aspect of the present invention, the first wire of the brake-equipped winch is detached from the weight and recovered. The method for inserting a geothermal heat exchanger into a borehole according to the fifth aspect of the present invention is characterized in that in the third aspect of the present invention, the first wire is cut to separate it from the brake-equipped winch. Effect of the Invention

[0007] The method of inserting a geothermal heat exchanger into a borehole of the present invention allows the geothermal heat exchanger and weight to be inserted into the borehole at an appropriate speed while applying the brakes, making it possible to insert the geothermal heat exchanger into the borehole safely and quickly. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is an overall front view showing a drilling machine used in the method of inserting a geothermal heat exchanger into a borehole according to the present invention. [Diagram 2] FIG. 2 is a conceptual diagram of the method of inserting a geothermal heat exchanger into a borehole according to the invention. [Diagram 3] 3(a) is an overall perspective view of the brake-equipped winch of FIG. 1, and FIG. 3(b) is an overall perspective view of the pulley for the underground heat exchanger of FIG. [Figure 4] FIG. 4 is a conceptual diagram showing an insertion step 1 for inserting the underground heat exchanger into a borehole. [Diagram 5] FIG. 5 is a conceptual diagram showing an insertion step 2 for inserting the underground heat exchanger into the borehole. [Figure 6] FIG. 6 is a conceptual diagram showing an insertion step 3 for inserting the underground heat exchanger into the borehole. [Figure 7] FIG. 7 is a conceptual diagram showing an insertion step 4 for inserting the underground heat exchanger into the borehole. [Figure 8] FIG. 8 is a conceptual diagram showing an insertion step 5 of inserting the underground heat exchanger into the borehole. [Figure 9] FIG. 9 is a conceptual diagram showing an insertion step 6 of inserting the underground heat exchanger into the borehole. [Figure 10] FIG. 10 is a conceptual diagram showing a method of connecting a first wire and a weight of a winch with a brake. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall front view of an excavation machine used in the method of inserting a geothermal heat exchanger into a borehole of the present invention, and FIG. 2 is a conceptual diagram of the method of inserting a geothermal heat exchanger into a borehole of the present invention. FIG. 3(a) is an overall perspective view of the brake-equipped winch of FIG. 1, and FIG. 3(b) is an overall perspective view of the pulley for a geothermal heat exchanger of FIG. 1. As shown in FIG. 1, an excavation machine 1 used in the embodiment of the present invention has a vehicle body 12 that travels by a crawler device 11, and a columnar leader 13 that is attached to the vehicle body 12 so as to be able to stand up and tilt. A columnar slide 2 is movably attached to the leader 13, and is raised and lowered by a slide drive hydraulic motor 14 at the upper end of the leader 13. A clamp 15 that clamps the drilling pipe when the drilling pipe is extended is attached to the lower end of the leader 13 so as to be able to be opened and closed. The slide 2 is raised and lowered by a sprocket and a chain (not shown) connected to the slide drive hydraulic motor 14. An excavation head 21 is movably attached to the slide 2, and is raised and lowered by an excavation head drive hydraulic motor 22 at the upper end of the slide 2. A rod reducer 23 is attached to the lower end of the excavation head 21.

[0010] A brake winch 3 shown in FIG. 3(a) is attached to the lower end of the rod reducer 23. A cylindrical connecting tube 32 is fixed to the upper surface of a frame 31 of the brake winch 3, and a screw 321 at the tip is screwed into the lower end of the rod reducer 23 to fix the brake winch 3 to the rod reducer 23. A cylindrical drum 33 is rotatably supported on the brake winch 3. The drum 33 is driven to rotate by a hydraulic motor 34 with a mechanical brake. The brake winch 3 is operated by a pendant switch (not shown), and the first wire 35 wound around the drum 33 can be wound down at any speed while applying the brake to the drum 33 by the hydraulic motor 34 with a mechanical brake. As shown in FIG. 1 and FIG. 2, a weight 6 is connected to the lower end of the first wire 35.

[0011] A winch 24 of an excavation machine is attached to the back of the slide 2 near the upper end, and a third wire 25 is wound around it and suspended down to near the ground surface. The lower end of the third wire 25 is connected to an eyebolt 41 of a pulley 4 for a geothermal heat exchanger shown in FIG. 3(b). A geothermal heat exchanger 5 made of polyethylene or the like is wound around a reel 51 for a geothermal heat exchanger installed on the ground surface, and its tip is inserted through the pulley 4 for the geothermal heat exchanger into a borehole 17 formed in the ground. A weight 6 is connected to the tip of the geothermal heat exchanger 5 by a second wire 52.

[0012] FIG. 4 is a conceptual diagram showing the insertion step 1 for inserting the underground heat exchanger 5 into the borehole 17. As shown in FIG. 4, a brake-equipped winch 3 is attached to the lower end of the rod reducer 23 of the drilling head 21. A weight 6 is connected to the lower end of the third wire 25 of the winch 24 of the drilling machine, and is brought to the opening of the borehole 17. Next, as shown in FIG. 5, the weight 6 is clamped by the clamp 15 provided on the drilling machine 1, and the third wire 25 is separated from the weight 6. Next, the required number of additional weights 6 are connected to the weight 6 clamped by the clamp 15 to obtain the required weight. Specifically, the eye bolt of the weight 6 clamped by the clamp 15 is loosened and removed, and a cut bolt of an appropriate length (a screw without a head and entirely threaded) is screwed into the female thread after the eye bolt is removed. An eye bolt is fastened to the additional weight 6, and the third wire 25 is used to lift it up, bring it over the weight 6 clamped in the clamp 15, and connect it to the cut bolt. This process is repeated until the ground heat exchanger 5 reaches a predetermined weight at which it does not float up.

[0013] Next, as shown in the insertion step 3 of FIG. 6, the first wire 35 of the winch 3 with brake is connected to the eye bolt of the weight 6. Next, as shown in the insertion step 4 of FIG. 7, the pulley 4 for the geothermal heat exchanger is connected to the lower end of the third wire 25, and then the winch 24 of the excavation machine is operated to lift the pulley 4 for the geothermal heat exchanger. Then, the geothermal heat exchanger 5 is hung on the pulley 4 for the geothermal heat exchanger, and the tip of the geothermal heat exchanger 5 is brought above the weight 6. Next, as shown in the insertion step 5 of FIG. 8, the tip of the geothermal heat exchanger 5 is connected to the weight 6 with the second wire 52. Next, as shown in the insertion step 6 of FIG. 9, the clamp 15 is opened to release the clamp of the weight 6. Next, the brake winch 3 is operated with a pendant switch (not shown), and the first wire 35 is wound down at an appropriate speed while the hydraulic motor 34 with mechanical brake is braking the drum 33. The underground heat exchanger 5 and the weight 6 are lowered simultaneously into the borehole 17, allowing them to be inserted safely at an appropriate speed.

[0014] FIG. 10 is a conceptual diagram showing a method of connecting the first wire 35 of the brake winch 3 and the weight 6. FIG. 10(a) is an example in which the weight 6 is suspended by passing the first wire 35 through an eye bolt 61 screwed into the upper end surface of the weight 6. In this example, the first wire 35 can be removed from the eye bolt 61 and collected after the geothermal heat exchanger 5 and the weight 6 are inserted to a predetermined depth in the borehole 17, which is preferable because the first wire 35 can be reused. FIG. 10(b) is an example in which the first wire 35 is tied to the eye bolt 61 screwed into the upper end surface of the weight 6. In this example, after the geothermal heat exchanger 5 and the weight 6 are inserted to a predetermined depth in the borehole 17, the first wire 35 is cut at the ground position and separated from the brake winch 3, and the first wire 35 is left in the ground.

[0015] [others] The above-mentioned first wire 35, second wire 52, and third wire 25 refer to wire ropes formed by twisting together several or several tens of wires as specified by the Japanese Industrial Standards and the like, and are abbreviated names for these. However, the second wire 52 may be a single wire, a number wire, used for bundling scaffolding at construction sites. In addition, the material of the wires is not limited to metal, and may be synthetic resin or natural fiber. Therefore, the wires in the present invention include these. [Explanation of symbols]

[0016] 1. Excavation machinery 11...Crawler device 12…Body 13. Leader 14...Slide drive hydraulic motor 15…Clamp 17…Drilling hole 2. Slide 21…Drilling head 22...Drilling head drive hydraulic motor 23…Rod reducer 24...Drilling machine winch 25…Third wire 3…Winch with brake 31...Frame 32...Connection tube 321...Screw 33...Drums 34...Hydraulic motor with mechanical brake 35…First wire 4...Pulley for underground heat exchanger 41…Eyebolt 5…Ground heat exchanger 51...Reel for underground heat exchanger 52…Second wire 6…Weight 61…Eyebolt

Claims

1. A method of inserting a tubular underground heat exchanger into a borehole formed in the ground to utilize geothermal heat. a weight is hung on a first wire of a brake-equipped winch attached to a lower end of a drilling head that is vertically movably provided on a drilling machine for forming the borehole; The weight is connected to the tip of the underground heat exchanger by a second wire; The winch with brake is activated, and the weight and the underground heat exchanger are simultaneously inserted into the borehole while applying the brake. A method for inserting a geothermal heat exchanger into a borehole.

2. In the method for inserting a geothermal heat exchanger into a borehole according to claim 1, Lifting the weight with a third wire of a winch of the drilling machine and carrying it into the wellhead of the borehole; The weight is clamped by a clamp of the excavation machine, After the third wire is removed from the weight, the weight is connected to the first wire of the winch with brake. A method for inserting a geothermal heat exchanger into a borehole.

3. In the method for inserting a geothermal heat exchanger into a borehole according to claim 2, Lifting a pulley for the underground heat exchanger with a third wire of a winch of the excavation machine; The underground heat exchanger is hung on the underground heat exchanger pulley and the tip of the underground heat exchanger is carried to the well mouth of the borehole. A method for inserting a geothermal heat exchanger into a borehole.

4. In the method for inserting a geothermal heat exchanger into a borehole according to claim 3, The first wire of the winch with brake is removed from the weight and retrieved. A method for inserting a geothermal heat exchanger into a borehole.

5. In the method for inserting a geothermal heat exchanger into a borehole according to claim 3, The first wire is cut to separate it from the winch with brake. A method for inserting a geothermal heat exchanger into a borehole.

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