CN114293714A - Semi-grouting sleeve for steel bar connection - Google Patents
Semi-grouting sleeve for steel bar connection Download PDFInfo
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- CN114293714A CN114293714A CN202011068143.8A CN202011068143A CN114293714A CN 114293714 A CN114293714 A CN 114293714A CN 202011068143 A CN202011068143 A CN 202011068143A CN 114293714 A CN114293714 A CN 114293714A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 21
- 239000010959 steel Substances 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 88
- 238000010438 heat treatment Methods 0.000 claims abstract description 70
- 239000011440 grout Substances 0.000 claims abstract description 23
- 238000005485 electric heating Methods 0.000 claims abstract description 10
- 239000002002 slurry Substances 0.000 claims abstract description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 11
- 241000220317 Rosa Species 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 7
- 238000010168 coupling process Methods 0.000 claims 7
- 238000005859 coupling reaction Methods 0.000 claims 7
- 238000007711 solidification Methods 0.000 abstract description 6
- 230000008023 solidification Effects 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 description 11
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a semi-grouting sleeve for connecting steel bars, which comprises a barrel, a grout inlet, an exhaust port, a left connector, a left positioning seat, left connecting steel bars, right connecting steel bars, a right connector, a water tank, a water pump, a heating box, an electric heating tube, a plurality of groups of water pipes and a heating sleeve. The invention can accelerate the solidification speed of the concrete slurry in the cylinder, shorten the construction period and improve the working efficiency.
Description
Technical Field
The invention relates to the technical field of semi-grouting sleeves, in particular to a semi-grouting sleeve for connecting reinforcing steel bars.
Background
The existing fabricated concrete structure building is built by adopting an industrialized technology, main structural components of the fabricated concrete structure building are prefabricated and produced in a factory, and the prefabricated concrete components are installed and connected into a whole after arriving at a site.
Therefore, a semi-grouting sleeve for connecting reinforcing steel bars is provided.
Disclosure of Invention
The invention aims to provide a semi-grouting sleeve for connecting reinforcing steel bars, which can accelerate the solidification speed of concrete grout in the sleeve, shorten the construction period and improve the working efficiency so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a semi-grouting sleeve for connecting steel bars comprises a barrel body, a grout inlet, an exhaust port, a left connector, a left positioning seat, left connecting steel bars, right connecting steel bars, a right connector, a water tank, a water pump, a heating box, an electric heating tube, a plurality of groups of water pipes and a heating sleeve, wherein a connecting cavity is arranged in the barrel body, the left part of the top end of the barrel body is connected with the bottom end of the exhaust port, the right part of the top end of the barrel body is connected with the bottom end of the grout inlet, the left end of the barrel body is connected with the left connector, the middle part of the left connector is provided with a left connector, the left positioning seat is sleeved with the left connecting steel bars, the left positioning seat is screwed with the left connector, the right connector is connected with the right end of the barrel body, the middle part of the right connector is provided with a right connector, the right connector is sleeved with the right connecting steel bars, the outer side of the barrel body is provided with a plurality of groups of reinforcing grooves, the heating sleeve with the barrel suit, heating sleeve's input with the output of water pump passes through water piping connection, the input of water pump with the output of heating cabinet passes through water piping connection, the input of heating cabinet with the output of water tank passes through water piping connection, the input of water tank with heating sleeve's output passes through water piping connection, the lower part of heating cabinet is provided with the heating chamber, the upper portion of heating cabinet is provided with hot water cavity, the electrothermal tube is located the heating intracavity.
Preferably, still include filter equipment, filter equipment includes rose box and multiunit filter screen, the input of rose box with heating sleeve's output passes through water piping connection, be provided with the filter chamber in the rose box, the multiunit the filter screen all is located the filter chamber, the output of rose box with the input of water tank passes through water piping connection.
Preferably, the heating sleeve includes half preceding and latter half, half preceding bottom with the bottom of latter half is articulated, half preceding top is provided with the multiunit connecting seat, the top of latter half is provided with the multiunit connector link, the multiunit the connecting seat respectively with the multiunit the connector link is connected.
Preferably, the edge region of the rear end of the front half piece and the edge region of the front end of the rear half piece are both provided with a gasket.
Preferably, the rear end of the front half piece and the front end of the rear half piece are both provided with heat insulation layers.
Preferably, the heating sleeve further comprises a multi-way connector, the input end of the multi-way connector is connected with the output end of the water pump, and the output end of the multi-way connector is connected with the input end of the heating sleeve through the water pipe.
Preferably, the outside cover of heating cabinet is equipped with the insulating layer.
Preferably, the device also comprises two groups of caps, and the two groups of caps are respectively sleeved with the upper parts of the slurry inlet and the exhaust port.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, a user connects a left positioning seat with a left connecting steel bar, then screws the left positioning seat with a left connecting head, then connects the left connecting head with the left side of a cylinder body, the user sleeves the right connecting head with the right connecting steel bar, then connects the right connecting head with the right side of the cylinder body, then pours concrete grout into a connecting cavity through a grout inlet, exhausts air in the connecting cavity through an exhaust port until the connecting cavity is filled, then the user sleeves a heating sleeve with the cylinder body, then the user starts a water pump, the water pump drives water in a water tank to flow from the water tank to a heating box, the water pump enters the heating sleeve and then returns to the water tank to flow circularly, an electric heating pipe heats the water in the heating box into hot water, the hot water enters the heating sleeve to heat the concrete grout in the cylinder body and the cylinder body, the solidification of the concrete grout is accelerated, and after the concrete is solidified, the user pulls down the heating sleeve, has realized can accelerating the solidification rate of the concrete thick liquid in the barrel, has shortened construction cycle, has improved work efficiency.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view of the barrel of the present invention;
FIG. 3 is a schematic top sectional view of the cartridge of the present invention;
FIG. 4 is a schematic cross-sectional view of a heating chamber of the present invention;
fig. 5 is a schematic sectional view of the filter box of the present invention.
In the figure: 1. a barrel; 2. a pulp inlet; 3. an exhaust port; 4. a left connector; 5. a left positioning seat; 6. left connecting steel bars; 7. right connecting reinforcing steel bars; 8. a right connector; 9. a water tank; 10. a water pump; 11. a heating box; 12. an electric heating tube; 13. a water pipe; 14. a reinforcing groove; 15. a filter box; 16. a filter screen; 17. a front half; 18. a rear half piece; 19. a connecting seat; 20. a connecting buckle; 21. a gasket; 22. a heat-insulating layer; 23. a multi-way joint; 24. a thermal insulation layer; 25. and (7) capping.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 5, the present invention provides a technical solution:
a semi-grouting sleeve for connecting reinforcing steel bars is shown in figure 1 and comprises a barrel body 1, a grout inlet 2, an exhaust port 3, a left connector 4, a left positioning seat 5, a left connecting reinforcing steel bar 6, a right connecting reinforcing steel bar 7, a right connector 8, a water tank 9, a water pump 10, a heating box 11, an electric heating pipe 12, a plurality of groups of water pipes 13 and a heating sleeve, wherein a connecting cavity is arranged in the barrel body 1, the left part of the top end of the barrel body 1 is connected with the bottom end of the exhaust port 3, the right part of the top end of the barrel body 1 is connected with the bottom end of the grout inlet 2, the left end of the barrel body 1 is connected with the left connector 4, a left connector is arranged in the middle of the left connector 4, the left positioning seat 5 is sleeved with the left connecting reinforcing steel bar 6, the left positioning seat 5 is screwed with the left connector, the right connector 8 is connected with the right end of the barrel body 1, a right connector is arranged in the middle of the right connector 8, the right connector is sleeved with the right connecting steel bar 7, a plurality of groups of reinforcing grooves 14 are formed in the outer side of the barrel 1, the heating sleeve is sleeved with the barrel 1, the input end of the heating sleeve is connected with the output end of the water pump 10 through the water pipe 13, the input end of the water pump 10 is connected with the output end of the heating box 11 through the water pipe 13, the input end of the heating box 11 is connected with the output end of the water tank 9 through the water pipe 13, the input end of the water tank 9 is connected with the output end of the heating sleeve through the water pipe 13, a heating cavity is formed in the lower portion of the heating box 11, a hot water cavity is formed in the upper portion of the heating box 11, and the electric heating pipe 12 is located in the heating cavity;
specifically, as shown in fig. 5, the water tank heat exchanger further comprises a filtering device, wherein the filtering device comprises a filtering tank 15 and multiple groups of filtering screens 16, the input end of the filtering tank 15 is connected with the output end of the heating sleeve through the water pipe 13, a filtering cavity is arranged in the filtering tank 15, the multiple groups of filtering screens 16 are all located in the filtering cavity, and the output end of the filtering tank 15 is connected with the input end of the water tank 9 through the water pipe 13.
Through adopting above-mentioned technical scheme, after hot water passes through heating sleeve, the impurity that has the outside of some heating sleeve insides and barrel 1 flows out along with hot water, then gets into filter box 15 in through filter screen 16's filtration back, gets into water tank 9, prevents that impurity from causing the jam to water pipe 13, causes the damage to water pump 10, has strengthened half telescopic stability and security of grout.
Specifically, as shown in fig. 1-3, the heating sleeve comprises a front half piece 17 and a rear half piece 18, the bottom end of the front half piece 17 is hinged to the bottom end of the rear half piece 18, a plurality of groups of connecting seats 19 are arranged at the top end of the front half piece 17, a plurality of groups of connecting buckles 20 are arranged at the top end of the rear half piece 18, and the plurality of groups of connecting seats 19 are respectively connected with the plurality of groups of connecting buckles 20.
Through adopting above-mentioned technical scheme, the user with preceding half 17 and latter half 18 respectively with the anterior of barrel 1 and rear portion suit, then connect preceding half 17 and latter half 18 through connecting seat 19 and connector link 20, the telescopic installation of heating and dismantlement are convenient for, have strengthened telescopic practicality and reliability of partly grouting.
Specifically, as shown in fig. 3, the edge region of the rear end of the front half 17 and the edge region of the front end of the rear half 18 are provided with gaskets 21.
By adopting the technical scheme, the sealing gasket 21 can prevent hot water between the front half piece 17 and the rear half piece 18 from leaking through gaps among the front half piece 17, the rear half piece 18 and the whole body, so that water and heat waste is caused, and the environmental protection property and the reliability of the half grouting sleeve are enhanced.
Specifically, as shown in fig. 3, the rear end of the front half 17 and the front end of the rear half 18 are both provided with an insulating layer 22.
Through adopting above-mentioned technical scheme, heat in the heat preservation 22 can prevent to heat the sleeve and scatter to the external world, has strengthened half grout sleeve's feature of environmental protection.
Specifically, as shown in fig. 1, the heating sleeve further comprises a multi-way joint 23, an input end of the multi-way joint 23 is connected with an output end of the water pump 10, and an output end of the multi-way joint 23 is connected with an input end of the heating sleeve through the water pipe 13.
Through adopting above-mentioned technical scheme, the user can improve the thermal utilization ratio of heating cabinet 11 through connecting 23 with a set of water pump 10 the multiunit heating sleeve that lead to more, has strengthened the telescopic feature of environmental protection of half grout, has improved the telescopic work efficiency of half grout.
Specifically, as shown in fig. 4, a heat insulation layer 24 is sleeved on the outer side of the heating box 11.
Through adopting above-mentioned technical scheme, insulating layer 24 can prevent the heat of heating cabinet 11 from scattering the external world, causes thermal waste, can prevent that heating cabinet 11 from scalding the people moreover, has strengthened the sheathed feature of environmental protection and security of partly being in milk.
Specifically, as shown in fig. 2, the device further comprises two sets of caps 25, and the two sets of caps 25 are respectively sleeved on the upper portion of the slurry inlet 2 and the upper portion of the exhaust port 3.
Through adopting above-mentioned technical scheme, the back of accomplishing is being grouted in to half grout sleeve, and the user advances the upper portion of thick liquid mouth 2 and the upper portion of gas vent 3 with the cap 25 suit, prevents that the thick liquid from flowing out through advancing thick liquid mouth 2 and gas vent 3, causes the waste of raw materials, influences half grout sleeve's linkage effect, has strengthened half grout sleeve's feature of environmental protection and stability.
The working principle is as follows: the user connects the left positioning seat 5 with the left connecting steel bar 6, then the left positioning seat 5 and the left connector 4 are screwed, then the left connector 4 is connected with the left side of the cylinder 1, the user sleeves the right connector 8 with the right connecting steel bar 7, then the right connector 8 is connected with the right side of the cylinder 1, then the user injects concrete grout into the connecting cavity through the grout inlet 2, air in the connecting cavity is discharged through the air outlet 3 until the connecting cavity is filled, then the user sleeves the heating sleeve with the cylinder 1, then the user starts the water pump 10, the water pump 10 drives water in the water tank 9 to flow from the water tank 9 to the heating box 11, the water enters the heating sleeve through the water pump 10 and then flows back to the water tank 9 in a circulating way, the electric heating pipe 12 heats water in the heating box 11 into hot water, the hot water enters the heating sleeve to heat the concrete grout in the cylinder 1 and the cylinder 1, the solidification of concrete slurry is accelerated, and after the concrete is solidified, a user pulls down the heating sleeve, so that the solidification speed of the concrete slurry in the barrel body 1 can be accelerated, the construction period is shortened, and the working efficiency is improved.
The electric heating tube 12 and the use process of the above components are all given by the background information provided by the present invention, and the description of the present invention is combined, so the skilled person can obtain the use process and obtain the corresponding use effect, and therefore, the present invention is not disclosed one by one.
The electric elements in the document are electrically connected with an external main controller and 220V mains supply through a transformer, the main controller can be a conventional known device controlled by a computer and the like, the product model provided by the invention is only used according to the structural characteristics of the product, the product can be adjusted and modified after being purchased, so that the product is more matched with and accords with the technical scheme of the invention, the product model is a technical scheme of the optimal application of the technical scheme, the product model can be replaced and modified according to the required technical parameters, and the product model is familiar to the technical personnel in the field, so that the technical scheme provided by the invention can clearly obtain the corresponding use effect.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a steel bar connection is with half grout sleeve which characterized in that: comprises a cylinder body (1), a grout inlet (2), an exhaust port (3), a left connector (4), a left positioning seat (5), a left connecting steel bar (6), a right connecting steel bar (7), a right connector (8), a water tank (9), a water pump (10), a heating box (11), an electric heating tube (12), a plurality of groups of water pipes (13) and a heating sleeve, wherein a connecting cavity is arranged in the cylinder body (1), the left part of the top end of the cylinder body (1) is connected with the bottom end of the exhaust port (3), the right part of the top end of the cylinder body (1) is connected with the bottom end of the grout inlet (2), the left end of the cylinder body (1) is connected with the left connector (4), the middle part of the left connector (4) is provided with a left positioning seat (5), the left positioning seat (5) is sleeved with the left connecting steel bar (6), and the left positioning seat (5) is screwed with the left connector, the right connector (8) is connected with the right end of the barrel body (1), the middle part of the right connector (8) is provided with a right connector, the right connector is connected with the right connecting steel bar (7) in a sleeved mode, the outer side of the barrel body (1) is provided with a plurality of groups of reinforcing grooves (14), the heating sleeve is connected with the barrel body (1) in a sleeved mode, the input end of the heating sleeve is connected with the output end of the water pump (10) through the water pipe (13), the input end of the water pump (10) is connected with the output end of the heating box (11) through the water pipe (13), the input end of the heating box (11) is connected with the output end of the water tank (9) through the water pipe (13), the input end of the water tank (9) is connected with the output end of the heating sleeve through the water pipe (13), the lower part of the heating box (11) is provided with a heating cavity, the upper part of the heating box (11) is provided with a hot water cavity, and the electric heating pipe (12) is positioned in the heating cavity.
2. The semi-grouting sleeve for reinforcing bar coupling according to claim 1, wherein: still include filter equipment, filter equipment includes rose box (15) and multiunit filter screen (16), the input of rose box (15) with heating sleeve's output passes through water pipe (13) are connected, be provided with the filter chamber in rose box (15), the multiunit filter screen (16) all are located the filter chamber, the output of rose box (15) with the input of water tank (9) passes through water pipe (13) are connected.
3. The semi-grouting sleeve for reinforcing bar coupling according to claim 2, wherein: heating sleeve includes half preceding piece (17) and latter half piece (18), the bottom of half preceding piece (17) with the bottom of latter half piece (18) is articulated, the top of half preceding piece (17) is provided with multiunit connecting seat (19), the top of latter half piece (18) is provided with multiunit connector link (20), multiunit connector link (19) respectively with the multiunit connector link (20) are connected.
4. A semi-grouting sleeve for reinforcing bar coupling according to claim 3, wherein: the edge area of the rear end of the front half sheet (17) and the edge area of the front end of the rear half sheet (18) are both provided with sealing gaskets (21).
5. The semi-grouting sleeve for reinforcing bar coupling according to claim 4, wherein: the rear end of the front half piece (17) and the front end of the rear half piece (18) are both provided with a heat-insulating layer (22).
6. The semi-grouting sleeve for reinforcing bar coupling according to claim 5, wherein: the water pump is characterized by further comprising a multi-way joint (23), wherein the input end of the multi-way joint (23) is connected with the output end of the water pump (10), and the output end of the multi-way joint (23) is connected with the input end of the heating sleeve through the water pipe (13).
7. The semi-grouting sleeve for reinforcing bar coupling according to claim 6, wherein: and a heat insulation layer (24) is sleeved on the outer side of the heating box (11).
8. The semi-grouting sleeve for reinforcing bar coupling according to claim 7, wherein: the slurry inlet and outlet device is characterized by further comprising two groups of caps (25), wherein the two groups of caps (25) are respectively sleeved with the upper portion of the slurry inlet (2) and the upper portion of the exhaust port (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011068143.8A CN114293714A (en) | 2020-10-08 | 2020-10-08 | Semi-grouting sleeve for steel bar connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011068143.8A CN114293714A (en) | 2020-10-08 | 2020-10-08 | Semi-grouting sleeve for steel bar connection |
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| Publication Number | Publication Date |
|---|---|
| CN114293714A true CN114293714A (en) | 2022-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011068143.8A Pending CN114293714A (en) | 2020-10-08 | 2020-10-08 | Semi-grouting sleeve for steel bar connection |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204826423U (en) * | 2015-08-02 | 2015-12-02 | 长安大学 | Prefabricated assembled is reinforcing bar sleeve grout connecting piece for concrete member |
| CN106382738A (en) * | 2016-11-15 | 2017-02-08 | 北京住总集团有限责任公司 | Assembly type prefabricated vertical member sleeve electric tracing heating system and using method thereof |
| CN109469267A (en) * | 2018-12-15 | 2019-03-15 | 山西二建集团有限公司 | Assembled high/low temperature season grout sleeve and construction method |
| CN110374265A (en) * | 2019-08-19 | 2019-10-25 | 甘肃省第八建设集团有限责任公司 | A kind of connection of half grout sleeve of assembly concrete and construction control method |
| CN210067238U (en) * | 2019-04-24 | 2020-02-14 | 郑州大学 | Half grout sleeve |
| CN111139977A (en) * | 2020-01-20 | 2020-05-12 | 云南省设计院集团有限公司 | Combined type semi-grouting sleeve and mounting method thereof |
| CN210857747U (en) * | 2019-07-30 | 2020-06-26 | 中国建筑第五工程局有限公司 | Movable twisted steel connecting sleeve |
| CN211144445U (en) * | 2019-12-18 | 2020-07-31 | 罗亮 | Natural gas well gas production tree circulation heating device |
-
2020
- 2020-10-08 CN CN202011068143.8A patent/CN114293714A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204826423U (en) * | 2015-08-02 | 2015-12-02 | 长安大学 | Prefabricated assembled is reinforcing bar sleeve grout connecting piece for concrete member |
| CN106382738A (en) * | 2016-11-15 | 2017-02-08 | 北京住总集团有限责任公司 | Assembly type prefabricated vertical member sleeve electric tracing heating system and using method thereof |
| CN109469267A (en) * | 2018-12-15 | 2019-03-15 | 山西二建集团有限公司 | Assembled high/low temperature season grout sleeve and construction method |
| CN210067238U (en) * | 2019-04-24 | 2020-02-14 | 郑州大学 | Half grout sleeve |
| CN210857747U (en) * | 2019-07-30 | 2020-06-26 | 中国建筑第五工程局有限公司 | Movable twisted steel connecting sleeve |
| CN110374265A (en) * | 2019-08-19 | 2019-10-25 | 甘肃省第八建设集团有限责任公司 | A kind of connection of half grout sleeve of assembly concrete and construction control method |
| CN211144445U (en) * | 2019-12-18 | 2020-07-31 | 罗亮 | Natural gas well gas production tree circulation heating device |
| CN111139977A (en) * | 2020-01-20 | 2020-05-12 | 云南省设计院集团有限公司 | Combined type semi-grouting sleeve and mounting method thereof |
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Application publication date: 20220408 |