A rapid backfilling vibration compaction mechanism and construction method for geothermal vertical buried borehole heat exchangers

Abstract

This invention discloses a rapid backfilling and compaction mechanism and construction method for geothermal vertical buried borehole heat exchangers. The mechanism includes a support frame, a crossbeam, a displacement plate, and a vibrator. Support frames are installed on both sides of the buried borehole, and a crossbeam is installed on top of the support frames. A displacement plate is slidably connected to the support frames. A rectangular through-hole is excavated in the center of the displacement plate, and an insert plate is inserted into the rectangular through-hole. An insertion hole is excavated on the insert plate at the position corresponding to the rectangular through-hole. An arc-shaped groove is provided on the left side of the insert plate, and an arc-shaped pressure plate is installed on the arc-shaped groove. The vibrator is connected to the buried pipe via a retaining ring, and the retaining ring is fixedly connected to the insert plate. This invention can quickly eliminate air bubbles in the backfill material, reduce the gaps in the backfill material, ensure the compaction of the backfill material, and prevent the vibrator from erratically swinging. It is flexible in use, simple to operate, and easy to promote.

Description

Technical Field

[0001] This invention relates to a rapid backfilling mechanism for buried boreholes, and particularly to a rapid backfilling and vibration mechanism and construction method for geothermal vertical buried borehole heat exchangers, belonging to the field of geothermal construction technology. Background Technology

[0002] Currently, geothermal resource development is widely used in the fields of cooling and heating, as well as other industries. Buried boreholes and their heat exchangers are essential components of ground source heat pump systems. In particular, the quality of backfilling after the installation of vertical buried borehole heat exchangers directly affects the heat exchange rate of the entire system. Traditional backfilling procedures involve multiple stages, with each stage proceeding only after the backfill material has settled naturally. However, this approach has several drawbacks: lengthy construction time, high manpower and material costs, and an inability to guarantee a satisfactory backfilling rate, meaning voids may occur during the backfilling process. A typical geothermal heating and cooling project in a residential area can have hundreds to thousands of buried boreholes. The speed and efficiency of backfilling these boreholes significantly impact the overall project investment. In particular, insufficient backfilling of the buried boreholes can lead to the failure of the entire project. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a rapid backfilling and vibration mechanism and construction method for geothermal vertical buried hole heat exchangers, which can make the backfill material descend rapidly and prevent voids from appearing in the backfill material, thereby improving work efficiency and ensuring construction quality.

[0004] The technical solution adopted by this invention to solve the technical problem is as follows:

[0005] A rapid backfilling and compaction mechanism for a geothermal vertical buried borehole heat exchanger includes a support frame, a crossbeam, a displacement plate, and a vibrator. Two supports are symmetrically distributed on both sides of the buried borehole. A crossbeam is mounted on the top of each support frame. A displacement plate is slidably connected to the support frame. A rectangular through-hole is carved in the center of each displacement plate, and an insert plate is inserted into the rectangular through-hole. An insertion hole is carved in each insert plate corresponding to the position of the rectangular through-hole. An arc-shaped groove is carved on the left side of each insert plate, and an arc-shaped pressure plate is mounted above the arc-shaped groove. The vibrator rod of the vibrator passes through the insertion hole and is connected to the buried pipe via a retaining ring. One side of the retaining ring is connected to the insert plate.

[0006] The retaining ring consists of a central ring and outer rings. Four outer rings are evenly distributed around the central ring. The inner diameter of the central ring matches the outer diameter of the vibrating rod at the lower end of the vibrator, and the inner diameter of the outer rings matches the outer diameter of the buried pipe.

[0007] The bracket has a base at its bottom and a through hole at its top. A crossbeam passes through the through hole and is fixed together with bolts.

[0008] The base has a first support column on its outer side. The displacement plate is sequentially sleeved on the bracket and the first support column, and the displacement plate is fixedly connected to the first support column by bolts.

[0009] The rectangular through hole is located between the two supports.

[0010] The bottom of the insert plate is provided with a groove at the position corresponding to the outer wall of the rectangular through hole. The bottom of the insert plate extends out of the bottom of the displacement plate, and a bolt is inserted through the insert plate below the displacement plate.

[0011] A second support post is provided on one side of the insertion hole, and one side of the retaining ring is sleeved on the second support post.

[0012] The arc-shaped groove is provided with screws on both sides, and the two ends of the arc-shaped pressure plate pass through the screws and are fixed by matching nuts.

[0013] The construction method of the rapid backfilling and vibration mechanism for a vertical buried geothermal heat exchanger includes the following steps:

[0014] S1: Place the bracket on both sides of the buried hole, and pass a crossbeam through the top of the bracket, and fix the bracket to the crossbeam together with bolts;

[0015] S2: Insert a plug plate into the displacement plate and insert a bolt into the bottom of the plug plate to prevent the plug plate from falling off the displacement plate;

[0016] S3: Place the center ring of the retaining ring on the vibrator, place the outer ring on one side of the retaining ring on the buried pipe, place the outer ring on the other side of the retaining ring on the second support, and at the same time, pass the buried pipe and the vibrating rod of the vibrator through the insertion hole and insert them into the buried hole.

[0017] S4: Place the arc-shaped pressure plate on the screw rod to limit the buried pipe and the rubber tube of the vibrator. The arc-shaped pressure plate does not need to press the buried pipe and the rubber tube of the vibrator tightly, it only needs to play a limiting role.

[0018] S5: When backfilling into the buried hole manually or mechanically, turn on the power switch of the vibrator and transmit the vibration to the buried pipe through the retaining ring until the backfill material in the buried hole stops descending, then turn off the power switch of the vibrator.

[0019] The positive and beneficial effects of this invention are:

[0020] This invention allows for the adjustment of the vibrator's height based on construction conditions by setting a displacement plate. The insertion hole and arc-shaped pressure plate on the plate provide support and restraint for the vibrator. At the same time, it keeps the buried pipe and the vibrator within the space, preventing the vibrator from swinging around and reducing the workload of workers.

[0021] 2. This invention uses a retaining ring to connect the buried pipe to the vibrator, thereby achieving a transmission function. It is also easy to assemble and disassemble, ensuring construction safety and improving backfill quality.

[0022] 3. The present invention has insertion holes at the positions of the rectangular through holes corresponding to the insertion plates, which improves the transmission effect, can quickly eliminate air bubbles in the backfill, reduce the gaps in the backfill, ensure the compactness of the backfill, and thus improve the backfill qualification rate. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a cross-sectional view of the retaining ring of the present invention;

[0025] Figure 3 This is a schematic diagram of the insert plate of the present invention;

[0026] Wherein: 1-bracket, 2-crossbeam, 3-first support column, 4-displacement plate, 5-rectangular through hole, 6-insertion plate, 7-insertion hole, 8-arc groove, 9-second support column, 10-screw, 11-arc pressure plate, 12-ring, 13-bolt, 14-vibrator. Detailed Implementation

[0027] The invention will be further explained and described below with reference to the accompanying drawings:

[0028] Example 1, see Figures 1-3 A rapid backfilling and compaction mechanism for a geothermal vertical buried borehole heat exchanger includes a support 1, a crossbeam 2, a displacement plate 4, and a vibrator 14. There are two supports 1, which are symmetrically distributed on both sides of the buried borehole. A crossbeam 2 is set on the top of the support 1. A displacement plate 4 is slidably connected to the support 1. A rectangular through hole 5 is dug in the middle of the displacement plate 4, and an insert plate 6 is inserted into the rectangular through hole 5. An insertion hole 7 is dug at the position of the insert plate 6 corresponding to the rectangular through hole 5. An arc-shaped groove 8 is dug on the left side of the insert plate 6. An arc-shaped pressure plate 11 is set above the arc-shaped groove 8. The vibrating rod of the vibrator 14 passes through the insertion hole 7 and is connected to the buried pipe through a retaining ring 12. One side of the retaining ring 12 is connected to the insert plate 6 (a support column is set on one side of the rectangular through hole, the support column is vertically fixed on the insert plate, and the retaining ring is sleeved on the support column).

[0029] The retaining ring 12 consists of a central ring and outer rings. Four outer rings are evenly distributed around the central ring. The inner diameter of the central ring matches the outer diameter of the vibrating rod at the lower end of the vibrator, and the inner diameter of the outer rings matches the outer diameter of the buried pipe.

[0030] The bottom of the bracket 1 is provided with a base, and the top of the bracket 1 is provided with a through hole, through which the crossbeam 2 passes and is fixed together by bolts.

[0031] The outer side of the base is provided with a first support column 3, and the displacement plate 4 is sequentially sleeved on the bracket 1 and the first support column 3, and the displacement plate 4 is fixedly connected to the first support column 3 by bolts.

[0032] The rectangular through hole 5 is located between the two brackets 1.

[0033] The bottom of the insert plate 6 is provided with a groove at the position corresponding to the outer wall of the rectangular through hole 5. The bottom of the insert plate 6 extends out of the bottom of the displacement plate 4, and a bolt 13 is inserted through the insert plate 6 below the displacement plate 4.

[0034] A second support post 9 is provided on one side of the socket 7, and one side of the retaining ring 12 is fitted onto the second support post 9.

[0035] Screws 10 are provided on both sides of the arc-shaped groove 8, and the two ends of the arc-shaped pressure plate 11 pass through the screws 10 and are fixed by matching nuts.

[0036] In the above description, a through hole is drilled at the end of the displacement plate corresponding to the position of the first support column, and a guide sleeve is provided above the through hole, and a tightening bolt is provided outside the guide sleeve.

[0037] In the above description, grooves are dug at the positions of the two side walls of the rectangular through hole at the bottom of the insert plate for inserting the insert plate. Bolts are set at the bottom of the insert plate. The bolts consist of a screw and a nut. The length of the screw is greater than the length of the insert plate. By tightening a matching nut at the end of the screw, the bottom of the insert plate is limited to prevent the insert plate from falling off the displacement plate during vibration.

[0038] In the above description, the bolts do not need to be tightly attached to the bottom of the displacement plate; they only need to serve a limiting function.

[0039] In the above description, the internal dimensions of the insertion hole are sufficient for the underground pipe and the vibrator rod of the vibrator to pass through, and the distance between the screws on both sides of the arc-shaped groove is also sufficient to accommodate the underground pipe and the vibrator rod of the vibrator.

[0040] Example 2: A construction method for a rapid backfilling and compaction mechanism for a vertical buried geothermal heat exchanger, comprising the following steps:

[0041] S1: Place bracket 1 on both sides of the underground hole, and pass through crossbeam 2 at the top of bracket 1, and fix bracket 1 and crossbeam 2 together with bolts;

[0042] S2: Insert a plate 6 into the displacement plate 4 and insert a bolt 13 into the bottom of the plate 6 to prevent the plate 6 from falling off the displacement plate 4.

[0043] S3: Place the central ring of the retaining ring 12 onto the vibrator 14, place the outer ring on one side of the retaining ring 12 onto the buried pipe, place the outer ring on the other side of the retaining ring 12 onto the second support 9, and at the same time, pass the buried pipe and the vibrating rod of the vibrator 14 through the insertion hole 7 and insert them into the buried hole.

[0044] S4: The arc-shaped pressure plate 11 is fitted onto the screw 10 to limit the buried pipe and the rubber tube of the vibrator. The arc-shaped pressure plate 11 does not need to press the buried pipe and the rubber tube of the vibrator tightly, as long as it can play a limiting role.

[0045] S5: When backfilling into the buried hole manually or mechanically, turn on the power switch of the vibrator 14 and transmit the vibration to the buried pipe through the retaining ring 12 until the backfill material in the buried hole stops descending, then turn off the power switch of the vibrator 14.

[0046] In the above steps, workers can connect the vibrator and the buried pipe to the retaining ring in advance, and then place the device at the buried hole; and adjust the height of the displacement plate as needed to meet the construction requirements.

[0047] In the above description, the height of the second support is sufficient to allow the retaining ring to be fitted onto the second support, and the outer diameter of the second support is smaller than the inner diameter of each ring in the retaining ring. This is because when the buried pipe and the vibrator are placed in the arc-shaped groove and pressed by the arc-shaped pressure plate, a certain arc shape will be generated. At this time, as long as the height of the second support is sufficient to allow the retaining ring to be fitted onto it, it is acceptable.

[0048] In the above description, by setting insertion holes and arc-shaped pressure plates on the insertion plate, the vibrator is restricted, preventing it from swinging wildly inside the buried hole.

[0049] In the above description, the vibrator is a prior art device, consisting of a drive unit, a rubber tube, and a vibration connector (vibrator rod). When in use, the rubber tube is located on the arc-shaped groove, and the vibration connector passes through the insertion hole and is inserted into the buried hole.

[0050] This invention connects the buried pipe to the vibrator via a retaining ring, thereby achieving a transmission function. It can quickly eliminate air bubbles in the backfill material, reduce the gaps in the backfill material, and ensure the compactness of the backfill material. By setting an insert plate on the displacement plate, the vibrator can be adjusted and limited, preventing the vibrator from swinging around randomly. It is flexible in use, simple to operate, and easy to promote.

Claims

1. A rapid backfilling and compaction mechanism for a vertical buried geothermal heat exchanger, comprising a support (1), a crossbeam (2), a displacement plate (4), and a vibrator (14), characterized in that: The brackets (1) are two in number, symmetrically distributed on both sides of the buried hole. A crossbeam (2) is provided on the top of the brackets (1). A displacement plate (4) is slidably connected to the brackets (1). A rectangular through hole (5) is dug in the middle of the displacement plate (4), and an insert plate (6) is inserted into the rectangular through hole (5). An insert hole (7) is dug at the position of the insert plate (6) corresponding to the rectangular through hole (5). An arc-shaped groove (8) is dug on the left side of the insert plate (6). An arc-shaped pressure plate (11) is provided above the arc-shaped groove (8). The vibrator ( The vibrating rod of 14) passes through the insertion hole (7) and is connected to the buried pipe through the retaining ring (12). One side of the retaining ring (12) is connected to the insert plate (6). The retaining ring (12) consists of a central ring and an outer ring. Four outer rings are evenly distributed on the outside of the central ring. The inner diameter of the central ring matches the outer diameter of the vibrating rod at the lower end of the vibrator. The inner diameter of the outer ring matches the outer diameter of the buried pipe. A second support (9) is provided on one side of the insertion hole (7). One side of the retaining ring (12) is fitted onto the second support (9).

2. The rapid backfilling and vibration mechanism for a vertical buried geothermal heat exchanger according to claim 1, characterized in that: The bottom of the bracket (1) is provided with a base, and the top of the bracket (1) is provided with a through hole, and the crossbeam (2) passes through the through hole and is fixed together by bolts.

3. The rapid backfilling and vibration mechanism for a vertical buried geothermal heat exchanger according to claim 2, characterized in that: The base is provided with a first support column (3) on its outer side. The displacement plate (4) is sequentially sleeved on the bracket (1) and the first support column (3), and the displacement plate (4) is fixedly connected to the first support column (3) by bolts.

4. The rapid backfilling and compaction mechanism for a vertical buried geothermal heat exchanger according to claim 1, characterized in that: The rectangular through hole (5) is located between the two supports (1).

5. The rapid backfilling and compaction mechanism for a vertical buried geothermal heat exchanger according to claim 1, characterized in that: The bottom of the insert plate (6) is provided with a groove at the position corresponding to the outer wall of the rectangular through hole (5). The bottom of the insert plate (6) extends out of the bottom of the displacement plate (4), and a bolt (13) is inserted through the insert plate (6) below the displacement plate (4).

6. The rapid backfilling and vibration mechanism for a vertical buried geothermal heat exchanger according to claim 1, characterized in that: The arc-shaped groove (8) is provided with screws (10) on both sides, and the two ends of the arc-shaped pressure plate (11) pass through the screws (10) and are fixed by matching nuts.

7. The construction method of a rapid backfilling and vibration compaction mechanism for a vertical buried geothermal heat exchanger according to claim 1, characterized in that, Includes the following steps: S1: Place the bracket (1) on both sides of the buried hole, and pass the crossbeam (2) through the top of the bracket (1), and fix the bracket (1) and the crossbeam (2) together with bolts; S2: Insert a plug plate (6) on the displacement plate (4) and insert a bolt (13) at the bottom of the plug plate (6) to prevent the plug plate (6) from falling off the displacement plate (4); S3: Place the central ring of the retaining ring (12) on the vibrator (14), place the outer ring on one side of the retaining ring (12) on the buried pipe, place the outer ring on the other side of the retaining ring (12) on the second support (9), and at the same time, insert the buried pipe and the vibrating rod of the vibrator (14) through the insertion hole (7) and insert them into the buried hole; S4: The arc-shaped pressure plate (11) is fitted onto the screw (10) to limit the buried pipe and the rubber tube of the vibrator. The arc-shaped pressure plate (11) does not need to press the buried pipe and the rubber tube of the vibrator tightly, as long as it can play a limiting role. S5: When backfilling into the buried hole manually or mechanically, turn on the power switch of the vibrator (14) and transmit the vibration to the buried pipe through the retaining ring (12) until the backfill material in the buried hole stops falling, then turn off the power switch of the vibrator (14).

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