CN218991606U - Grounding combined structure installed by grouting holes in shield tunnel - Google Patents
Grounding combined structure installed by grouting holes in shield tunnel Download PDFInfo
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- CN218991606U CN218991606U CN202223345155.8U CN202223345155U CN218991606U CN 218991606 U CN218991606 U CN 218991606U CN 202223345155 U CN202223345155 U CN 202223345155U CN 218991606 U CN218991606 U CN 218991606U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
A grounding combined structure installed by using grouting holes in a shield tunnel comprises grouting holes and a grounding device, wherein a thread groove is reserved on the wall of the lower part of the inner grouting holes of a segment; the grounding device sequentially comprises four parts from top to bottom: the grounding electrode, the bolt body, the sealing plug and the connecting terminal; the grounding device is arranged in the grouting hole, the grounding electrode is inserted into a pipe piece or a tunnel soil body above the grouting hole, the external threads of the bolt body are fixedly connected with the threaded grooves in a spiral manner, the rubber sealing ring is embedded into the grouting hole to be tightly pressed and sealed, the sealing plug is inserted into the grouting hole in a wedge shape to seal the bottom end of the grouting hole, and the connecting terminal is exposed out of the grouting hole and connected with an external grounding wire of the equipment. The utility model can be arranged at any grouting hole position reserved in the shield tunnel segment, is convenient to install, provides a grounding path for fault current for the electric device at any time and any place, can effectively ensure the use safety of the electric device, and can be flexibly adjusted according to different conditions of shield tunnel construction sites.
Description
Technical Field
The utility model relates to the technical field of grounding devices in shield tunnel engineering, in particular to a grounding combined structure installed in a shield tunnel by using grouting holes.
Background
Generally, the grounding resistor can effectively ensure that the grounding fault current is timely diffused into the nearby ground, and can effectively overcome the risks that once the grounding resistance value is higher, the voltage on the outer shell of the electrical equipment is higher, the danger of electric shock is caused, the neutral point offset of the transformer is possibly caused, the phase voltage of part of equipment is higher, the service life of the equipment is reduced, and the like.
At present, two common methods for shield tunnel grounding are available, one method is to utilize reinforcing steel bars in the segments to communicate the reinforcing steel bars between the segments through connecting bolts between the segments. And finally, reliably connecting the grounding terminal led out from the tunnel to the electrical system by utilizing the reserved steel bars or the post-planted steel bars, and taking the steel bars in the duct piece as a grounding device. And the other is to pre-embed the grounding electrode by utilizing post-cast internal structures (such as arc plates and lane plates) in the shield tunnel and finally to lead the grounding system to the ground through the structure that the shield well exposes out of the ground part, and then to arrange a conventional grounding device.
Both of the above cases have certain drawbacks:
(1) Since the steel bars in the duct pieces are all contained in the concrete, the steel bars are not directly contacted with the external soil. The technician is not easy to directly calculate the resistance value of the grounding device, and the grounding trunk is usually tested after the construction is completed. Once the grounding resistance specification is not met, the subsequent problem is difficult to solve, and the safe operation of the electrical equipment cannot be ensured.
(2) And (3) constructing a shield tunnel, tunneling and splicing the segments by using a shield machine, wherein the segments are prefabricated, and the grounding electrode is difficult to be pre-buried into surrounding soil in advance. Because the resistance of the grounding resistor is closely related to natural factors such as the resistivity of surrounding soil, the use of the steel bars in the duct piece as the grounding electrode has great uncertainty and is difficult to find remedial measures.
(3) The shield wells are used as the tunnel grounding electrode, once the shield interval is too long, the shield wells at the two ends are arranged at a relatively long interval, and the full-line grounding resistance of the tunnel is not easy to meet.
In summary, designing a grounding device for shield tunnel engineering can improve the situation that the grounding resistance at any position of the tunnel is too high, and effectively improves the safety of the tunnel full-line electrical system, which is a primary problem to be solved currently.
Disclosure of Invention
The present utility model is directed to solving the above technical problems that the grounding assembly is not easily installed in a tunnel by using a grouting hole in a shield tunnel.
In order to prevent the shield tunnel segment from floating upwards due to the uncompacted synchronous grouting of the shield segment and the formation gaps around the segment, the shield tunnel segment is usually reserved with 1-3 grouting holes on each segment, and cement slurry or other chemical slurry can be injected into the formation through the reserved grouting holes when needed. The utility model adopts the reserved grouting holes of the shield tunnel segments as the grounding electrode.
The technical scheme of the utility model is realized as follows:
the grounding combined structure installed by using the grouting holes in the shield tunnel comprises the grouting holes and a grounding device, and is characterized in that,
a thread groove 31 is reserved on the wall of the inner lower part of the grouting hole 3 reserved in the segment 1;
the grounding device sequentially comprises four parts from top to bottom: the grounding electrode 4, the bolt body 2, the sealing plug 6 and the connecting terminal 5;
the grounding electrode 4 is an elongated metal needle body;
the bolt body 2 is a metal pipe body, the upper port of the bolt body is sealed, the upper end of the bolt body 2 is welded and connected with the vertically arranged grounding electrode 4, the outer side wall of the lower part of the bolt body is provided with an external thread 21 which is matched and connected with the thread groove 31, and the outer wall of the pipe body at the upper end of the external thread is nested with a rubber sealing ring 7;
the sealing plug 6 is in a truncated cone shape with a small upper end and a large lower end; the small end of the sealing plug is correspondingly matched with the lower end of the bolt body 2 in shape and is welded and connected with the bottom end of the bolt body 2 at the bottom opening of the bolt body, and the bottom end of the sealing plug is provided with a radial convex annular bottom foot in the shape of a flange plate; the connecting terminal 5 is welded and connected to the annular bottom foot;
the grounding device is installed in the grouting hole 3, the grounding electrode 4 is inserted into a pipe piece or a tunnel soil body 100 above the grouting hole, the external thread 21 of the bolt body 2 is fixedly connected with the thread groove 31 in a spiral mode, the rubber sealing ring 7 is embedded into the grouting hole to be tightly pressed and sealed, the sealing plug is inserted into the grouting hole 3 in a wedge mode to seal the bottom end of the grouting hole, and the connecting terminal 5 is exposed out of the grouting hole and connected with an external grounding wire of the equipment.
The grounding electrode 4 is galvanized round steel or galvanized flat steel; the grouting bolt body 2 is a hot dip galvanized steel pipe, and the upper end of the grouting bolt body is welded and sealed by a hot dip galvanized steel plate; the sealing plug is a hot galvanizing sealing plug; the connecting terminal is made of flat steel.
The beneficial effects of the utility model are that
Compared with the prior art, the utility model provides the grounding combined structure which is installed by utilizing the grouting holes in the shield tunnel, and the grounding device can be installed at any grouting hole position reserved in the segment of the shield tunnel, is convenient to install, provides a grounding path for fault current for an electric device at any time and any place, can effectively ensure the use safety of electric equipment, and can be flexibly adjusted according to different conditions of the construction site of the shield tunnel.
Drawings
Figure 1 is a schematic view of the structure of the grouting holes on the pipe sheet of the utility model,
FIG. 2 is a schematic view of a grounding device according to the present utility model;
FIG. 3 is a schematic view showing the combined structure of the grounding device installed in the grouting hole;
description of the drawings:
Detailed Description
The following describes in detail the embodiments of the present utility model with reference to the drawings.
Referring to fig. 1-3, a grounding combined structure installed by grouting holes in a shield tunnel according to the present utility model comprises grouting holes, a grounding device,
referring to fig. 1, a thread groove 31 is reserved on the inner lower hole wall of the grouting hole 3 reserved in the segment 1;
referring to fig. 2, the grounding device sequentially comprises four parts from top to bottom: the grounding electrode 4, the bolt body 2, the sealing plug 6 and the connecting terminal 5;
the grounding electrode 4 is an elongated metal needle body;
the bolt body 2 is a metal pipe body, the upper port of the bolt body is sealed, the upper end of the bolt body 2 is welded and connected with the vertically arranged grounding electrode 4, the outer side wall of the lower part of the bolt body is provided with an external thread 21 which is matched and connected with the thread groove 31, and the outer wall of the pipe body at the upper end of the external thread is nested with a rubber sealing ring 7;
the sealing plug 6 is in a truncated cone shape with a small upper end and a large lower end; the small end of the sealing plug is correspondingly matched with the lower end of the bolt body 2 in shape and is welded and connected with the bottom end of the bolt body 2 at the bottom opening of the bolt body, and the bottom end of the sealing plug is provided with a radial convex annular bottom foot in the shape of a flange plate; the connecting terminal 5 is welded and connected to the annular bottom foot;
referring to fig. 3, the grounding device is installed in the grouting hole 3, the grounding electrode 4 is inserted into a segment or a tunnel soil body 100 above the grouting hole, the external thread 21 of the bolt body 2 is fixedly connected with the thread groove 31 in a screwed manner, the rubber sealing ring 7 is embedded into the grouting hole to be tightly pressed and sealed, the sealing plug is wedge-inserted into the grouting hole 3 to seal the bottom end of the grouting hole, and the connecting terminal 5 is exposed out of the grouting hole and connected with an external grounding wire of the equipment.
The grounding device is integrally a metal conductor, and the grounding electrode 4 is galvanized round steel or galvanized flat steel; the grouting bolt body 2 is a hot dip galvanized steel pipe, and the upper end of the grouting bolt body is welded and sealed by a hot dip galvanized steel plate; the sealing plug is a hot dip galvanized steel sealing plug; the connecting terminal is made of flat steel.
The utility model relates to a grounding combined structure designed for reserving grouting holes under current conditions. Fig. 1 shows a mode of setting injection points of grouting holes, wherein screw grooves 31 are reserved at the inner sides of the grouting holes so as to facilitate the installation and connection of grouting bolt bodies 2. Fig. 2 is a main form of a grounding device, and compared with the prior art, the utility model provides a grounding path of fault current for an electric device at any time and any place, can effectively ensure the use safety of electric equipment, and can be flexibly adjusted according to different conditions of a shield tunnel construction site.
Claims (2)
1. The grounding combined structure installed by using the grouting holes in the shield tunnel comprises the grouting holes and a grounding device, and is characterized in that,
reserving a thread groove (31) on the inner lower hole wall of the grouting hole (3) reserved in the pipe piece (1);
the grounding device sequentially comprises four parts from top to bottom: the grounding electrode (4), the bolt body (2), the sealing plug (6) and the connecting terminal (5);
the grounding electrode (4) is an elongated metal needle body;
the bolt body (2) is a metal pipe body, the upper port of the bolt body is sealed, the upper end of the bolt body (2) is welded and connected with the vertically arranged grounding electrode (4), the outer side wall of the lower part of the bolt body is provided with an external thread (21) which is matched and connected with the thread groove (31), and the outer wall of the pipe body at the upper end of the external thread is nested with a rubber sealing ring (7);
the sealing plug (6) is in a truncated cone shape with a small upper end and a large lower end; the small end of the sealing plug is correspondingly matched with the lower end of the bolt body (2), and is welded and connected to the bottom end of the bolt body (2) at the bottom opening of the bolt body, and the bottom end of the sealing plug is provided with a radial convex annular bottom foot in the shape of a flange plate; the connecting terminal (5) is welded on the annular bottom foot;
the grounding device is installed in the grouting hole (3), the grounding electrode (4) is inserted into a duct piece or a tunnel soil body (100) above the grouting hole, an external thread (21) of the bolt body (2) is fixedly connected with the thread groove (31) in a spiral mode, the rubber sealing ring (7) is embedded into the grouting hole to be tightly pressed and sealed, the sealing plug is inserted into the grouting hole (3) to be tightly pressed and sealed, the bottom end of the grouting hole is sealed, and the connecting terminal (5) is exposed outside the grouting hole and connected with an external grounding wire of the equipment.
2. A grounding assembly for installation in a shield tunnel with grouting holes according to claim 1, characterized in that the grounding electrode (4) is galvanized round steel or galvanized flat steel; the bolt body (2) is a hot dip galvanized steel pipe, and the upper end of the bolt body is welded and sealed by a hot dip galvanized steel plate; the sealing plug is a hot dip galvanized steel sealing plug; the connecting terminal is made of flat steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223345155.8U CN218991606U (en) | 2022-12-13 | 2022-12-13 | Grounding combined structure installed by grouting holes in shield tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223345155.8U CN218991606U (en) | 2022-12-13 | 2022-12-13 | Grounding combined structure installed by grouting holes in shield tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218991606U true CN218991606U (en) | 2023-05-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223345155.8U Active CN218991606U (en) | 2022-12-13 | 2022-12-13 | Grounding combined structure installed by grouting holes in shield tunnel |
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| Country | Link |
|---|---|
| CN (1) | CN218991606U (en) |
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2022
- 2022-12-13 CN CN202223345155.8U patent/CN218991606U/en active Active
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