CN110629774A - Deep foundation pit dewatering construction method - Google Patents
Deep foundation pit dewatering construction method Download PDFInfo
- Publication number
- CN110629774A CN110629774A CN201910750314.6A CN201910750314A CN110629774A CN 110629774 A CN110629774 A CN 110629774A CN 201910750314 A CN201910750314 A CN 201910750314A CN 110629774 A CN110629774 A CN 110629774A
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- water
- steel pipe
- ring
- drinking
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a deep foundation pit dewatering construction method which comprises a water suction pump and a second positioning ring of a circular ring structure, wherein a plurality of cross rods are arranged on the outer wall of the circumference of the second positioning ring, supporting plates are arranged on the cross rods and can move on the cross rods along the horizontal direction, and the supporting plates are distributed at a wellhead in an annular array manner; be equipped with the drinking-water pipe in the second holding ring, the bottom and the suction pump of drinking-water pipe are connected, still are equipped with a plurality of bolster on the lateral wall of drinking-water pipe, the bolster is annular array and distributes on the lateral wall of drinking-water pipe, the one end and the drinking-water union coupling of bolster all are equipped with anticollision piece on the other end. The deep well water pump device can prevent the water pump from colliding with the inner wall of the deep well when the water pump is placed into the deep well, and prolong the service life of the water pump.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a deep foundation pit dewatering construction method.
Background
The foundation pit dewatering refers to dewatering work performed for ensuring that the foundation pit can be constructed under a dry condition and preventing slope instability, foundation quicksand, pit bottom uplift, pit bottom piping and foundation bearing capacity reduction when the underground water level is higher than the excavation bottom surface when the foundation pit is excavated. When the foundation pit is subjected to precipitation treatment, a deep well is usually excavated, then a water suction pump is placed into the deep well, and underground water in the well is pumped out by the water suction pump, so that the purpose of foundation pit precipitation is achieved. At present, putting into the in-process to the deep well with the suction pump, the suction pump collides with the inner wall of deep well easily, causes the damage of suction pump, in order to avoid colliding with the wall of a well when placing the suction pump, adopts the stereoplasm steel pipe with the drain pipe usually for when placing the suction pump, be difficult for colliding with the deep well inner wall, but the turnover transportation of being not convenient for.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a deep foundation pit dewatering construction method, which can avoid the collision between a water pump and the inner wall of a deep well when the water pump is placed into the deep well and prolong the service life of the water pump.
The invention is realized by the following technical scheme:
a deep foundation pit dewatering construction method comprises the following steps:
1) connecting a second steel pipe of the water pumping pipe with a second positioning ring, then connecting the cross rod with the second positioning ring, connecting the embedded rod with the cross rod through threads, and fixing the embedded rod around the deep well;
2) the position of the supporting plate is adjusted according to the diameter of the wellhead of the deep well, so that the supporting plate is tightly pressed on the inner wall of the wellhead;
3) the water pump is placed into the deep well, and when the water pump is placed into the deep well, the anti-collision block protects the water pump;
4) connecting the transverse plate with the embedded rod through the fixing ring, and connecting a second steel pipe of the water pumping pipe with the first positioning ring;
5) pumping underground water in the deep well by using a water pump;
6) when the suction pump needs to move downwards, the first fixing rod on the first positioning ring and the second fixing rod on the second positioning ring are unscrewed, so that the second steel pipe moves downwards, and the suction pump can be guaranteed to pump underground water at a low water level.
The water pump comprises a water pump and a second positioning ring with a circular ring structure, wherein a plurality of cross rods are arranged on the outer wall of the circumference of the second positioning ring, supporting plates are arranged on the cross rods, the supporting plates can move on the cross rods along the horizontal direction, and the supporting plates are distributed at a wellhead in an annular array;
be equipped with the drinking-water pipe in the second holding ring, the bottom and the suction pump of drinking-water pipe are connected, still are equipped with a plurality of bolster on the lateral wall of drinking-water pipe, the bolster is annular array and distributes on the lateral wall of drinking-water pipe, the one end and the drinking-water union coupling of bolster (3), all are equipped with the anticollision piece on the other end.
The water pump comprises a water pump and a second positioning ring with a circular ring structure, wherein a plurality of cross rods are arranged on the outer wall of the circumference of the second positioning ring, supporting plates are arranged on the cross rods, the supporting plates can move on the cross rods along the horizontal direction, and the supporting plates are distributed at a wellhead in an annular array; be equipped with the drinking-water pipe in the second holding ring, the bottom and the suction pump of drinking-water pipe are connected, still are equipped with a plurality of bolster on the lateral wall of drinking-water pipe, the bolster is annular array and distributes on the lateral wall of drinking-water pipe, the one end and the drinking-water union coupling of bolster all are equipped with anticollision piece on the other end.
According to the invention, the plurality of elastic pieces are arranged on the circumferential outer wall of the water pumping pipe, the elastic pieces are springs and have a certain buffering function, and when the elastic pieces are in a non-compressed state, the distance between the outer side of the anti-collision block and the water pumping pipe is larger than the distance between the outer side of the water pumping pump and the water pumping pipe, so that when the water pumping pump is placed into a deep well, the anti-collision block protrudes out of the water pumping pump, when the water pumping pump is placed to collide with the inner wall of the deep well, the arranged anti-collision block can collide with the inner wall of the deep well firstly, and simultaneously, under the action of the strip-shaped piece, the collision force can be relieved, a certain buffering effect is achieved, so that the collision between the water pumping pump and the inner wall of the deep well is avoided, and; simultaneously, the second holding ring that sets up can guarantee that the drinking-water pipe is in the central point department of putting of deep well, improves the extraction efficiency to groundwater, and the backup pad that sets up can support in deep well head department, when improving well head stability, can the side keep off partly construction impurity and drop to in the deep well.
Further, the horizontal pole runs through the backup pad and is connected with the second holding ring through the screw thread, all be equipped with stop nut on the horizontal pole, stop nut passes through the screw thread and is connected with the horizontal pole to stop nut is located the inboard of backup pad.
The horizontal pole that sets up adopts the screw thread to be connected with the second holding ring, is convenient for carry out fast loading and unloading to horizontal pole and second holding ring to the outdoor turnover of being convenient for is used, and the stop nut who sets up can carry on spacingly to the backup pad, avoids the backup pad to remove towards second holding ring direction on the horizontal pole, guarantees that the backup pad that sets up can support in stabilizing going on to the well head.
Further, the cross section of the supporting plate is of an arc-shaped structure.
Set the backup pad to the arc structure for the backup pad can be in the same place with the laminating of well head inner wall better, improves the area of contact between backup pad and the well head inner wall, and the effort of increase backup pad to the well head inner wall.
Further, the drinking-water pipe includes first steel pipe, hose and second steel pipe, the both ends of hose are connected with first steel pipe and second steel pipe respectively, and the bolster is located the outer wall of first steel pipe, the second steel pipe is located the second locating ring intra-annular.
The drinking-water pipe among this technical scheme adopts the mode of stereoplasm steel pipe and hose combination, the first steel pipe of setting is convenient for pass through the welding with the elastic component that sets up, guarantee that the elastic component can stably fix on the lateral wall of first steel pipe, and the second steel pipe that sets up is convenient for be connected between and the second holding ring, guarantee that the second holding pipe can stably fix on first holding ring, and set up the hose between first steel pipe and second steel pipe, because the hose matter is soft, can the rolling together, make the hose portion can the rolling, space that occupies when reducing the drinking-water pipe turnover, thereby the handling of drinking-water pipe turnover of being convenient for.
Further, still be equipped with two second dead levers on the outer wall of second holding ring, the second dead lever is located the axis both sides of second holding ring respectively to the second dead lever is located the below of horizontal pole, the horizontal pole passes through screw thread and second holding ring horizontal connection, and the horizontal pole can be fixed the second steel pipe in the second holding ring.
The second dead lever that sets up is used for fixing the second steel pipe section of drinking-water pipe, and when screwing up the second dead lever, the second dead lever can remove towards second holding ring axis direction to fix the second steel pipe in the second holding ring, thereby fix the drinking-water pipe in the deep well stably.
Furthermore, the cross rods are also provided with embedded rods, the embedded rods are vertically connected with the cross rods through threads, transverse plates are arranged on the embedded rods and are located above the second positioning rings, the transverse plates are provided with first positioning rings, the central axes of the first positioning rings and the central axes of the second positioning rings are on the same straight line, and the second steel pipes are located in the first positioning rings; further, still be equipped with two first dead levers on the outer wall of first locating ring, first dead lever passes through screw thread and first locating ring horizontal connection to first dead lever can fix the second steel pipe in first locating ring.
The embedded rod is used for being fixed on the ground beside the deep well, so that the second positioning ring is stably fixed above the wellhead of the deep well; the diaphragm that sets up on the pre-buried pole is used for fixing the second steel pipe section to the drinking-water pipe simultaneously, utilizes the first dead lever that sets up to improve the fixity ability to the second steel pipe to guarantee that the drinking-water pipe can stably fix in the deep well, simultaneously, utilize the first holding ring and the second holding ring that set up to fix a position the second steel pipe, guarantee that the second steel pipe can be located the central point department of deep well, thereby make the suction pump can extract the groundwater in the deep well better.
Further, the bottom of pre-buried pole is equipped with the awl point, still be equipped with two solid fixed rings on the pre-buried pole, gu fixed ring passes through the screw thread and is connected with pre-buried pole to the diaphragm is located between two solid fixed rings.
Set the bottom of pre-buried pole into awl point structure, be convenient for insert the built-in fitting fast to the soil around the well head in, realize the fixed to pre-buried pole, and two solid fixed rings that set up are used for fixing the diaphragm, guarantee that the diaphragm can stably fix on pre-buried pole, utilize the solid fixed ring that sets up to be convenient for dismantle the diaphragm from pre-buried pole fast simultaneously, the turnover of being convenient for is used.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the deep foundation pit dewatering construction method, when the water pump is placed into the deep pit, the collision block is arranged to protrude out of the water pump, so that the collision block can collide with the water pump preferentially, the water pump is prevented from colliding with the inner wall of the deep pit, and the service life of the water pump is prolonged;
2. according to the deep foundation pit dewatering construction method, the arranged water pumping pipes are combined by adopting the steel pipes and the hoses, so that the water pumping pipes are convenient to store, the storage space is saved, and the water pumping pipes are convenient to use in a turnover manner;
3. according to the deep foundation pit dewatering construction method, the supporting plate is arranged and used for supporting the deep well mouth internally, the stability of the well mouth is improved, meanwhile, the supporting plate can prevent part of construction impurities from falling into the deep well, and the water suction pump can be guaranteed to stably extract underground water in the deep well.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of a second retaining ring of the present invention shown attached to a support plate;
FIG. 3 is a top view of the cross plate of the present invention;
FIG. 4 is a top view of a second retaining ring of the present invention;
fig. 5 is a schematic structural view of the embedded rod of the present invention.
Reference numbers and corresponding part names in the drawings:
1-deep well, 2-water pump, 3-buffer piece, 4-anti-collision block, 5-hose, 6-support plate, 7-first steel pipe, 8-fixing ring, 9-cross rod, 10-first fixing rod, 11-first positioning ring, 12-second steel pipe, 13-cross plate, 14-embedded rod, 15-limiting nut, 16-second positioning ring, 17-conical tip and 18-second fixing rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
As shown in fig. 1 to 5, the deep foundation pit dewatering construction method of the present invention includes the following steps:
1) connecting a second steel pipe 12 of the water pumping pipe with a second positioning ring 16, then connecting a cross rod 9 with the second positioning ring 16, connecting an embedded rod 14 with the cross rod 9 through threads, and fixing the embedded rod 14 around the deep well 1;
2) the position of the support plate 6 is adjusted according to the diameter of the wellhead 1 of the deep well 1, so that the support plate 6 is tightly pressed on the inner wall of the wellhead;
3) the water pump 2 is placed into the deep well 1, and when the water pump 2 is placed into the deep well 1, the anti-collision block 4 protects the water pump 2;
4) connecting a transverse plate 13 with an embedded rod 14 through a fixing ring 8, and connecting a second steel pipe 12 of a water pumping pipe with a first positioning ring 11;
5) pumping the underground water in the deep well 1 by using a water pump 2;
6) when the water suction pump 2 needs to be moved downwards, the first fixing rod 10 on the first positioning ring 11 and the second fixing rod 18 on the second positioning ring 16 are unscrewed, so that the second steel pipe 12 moves downwards, and the water suction pump 2 is guaranteed to be capable of pumping underground water with low water level.
The water pump comprises a water pump 2 and a second positioning ring 16 with a circular ring structure, wherein a plurality of cross rods 9 are arranged on the outer wall of the circumference of the second positioning ring 16, supporting plates 6 are arranged on the cross rods 9, the supporting plates 6 can move on the cross rods 9 along the horizontal direction, and the supporting plates 6 are distributed at a wellhead in an annular array;
be equipped with the drinking-water pipe in the second holding ring 16, the bottom and the suction pump 2 of drinking-water pipe are connected, still are equipped with a plurality of bolster 3 on the lateral wall of drinking-water pipe, bolster 3 is annular array and distributes on the lateral wall of drinking-water pipe, the one end and the drinking-water union coupling of bolster 3 all are equipped with anticollision piece 4 on the other end.
The water pump comprises a water pump 2 and a second positioning ring 16 with a circular ring structure, wherein a plurality of cross rods 9 are arranged on the outer wall of the circumference of the second positioning ring 16, supporting plates 6 are arranged on the cross rods 9, the supporting plates 6 can move on the cross rods 9 in the horizontal direction, and the supporting plates 6 are distributed at a wellhead in an annular array; be equipped with the drinking-water pipe in the second holding ring 16, the bottom and the suction pump 2 of drinking-water pipe are connected, still are equipped with a plurality of bolster 3 on the lateral wall of drinking-water pipe, bolster 3 is annular array and distributes on the lateral wall of drinking-water pipe, the one end and the drinking-water union coupling of bolster 3 all are equipped with anticollision piece 4 on the other end. The cross rod 9 penetrates through the supporting plate 6 and is connected with the second positioning ring 16 through threads, the cross rod 9 is provided with a limiting nut 15, the limiting nut 15 is connected with the cross rod 9 through threads, and the limiting nut 15 is located on the inner side of the supporting plate 6.
Example 2
On the basis of the embodiment 1, the cross section of the supporting plate 6 is of an arc-shaped structure.
Example 3
On the basis of embodiment 1, the drinking-water pipe includes first steel pipe 7, hose 5 and second steel pipe 12, the both ends of hose 5 are connected with first steel pipe 7 and second steel pipe 12 respectively, and bolster 3 is located the outer wall of first steel pipe 7, second steel pipe 12 is located second holding ring 16. Two second fixing rods 18 are further arranged on the outer wall of the second positioning ring 16, the second fixing rods 18 are located on two sides of the axis of the second positioning ring 16 respectively, the second fixing rods 18 are located below the cross rod 9, the cross rod 9 is horizontally connected with the second positioning ring 16 through threads, and the cross rod 9 can fix the second steel pipe 12 in the second positioning ring 16.
Example 4
On embodiment 1's basis, still all be equipped with pre-buried pole 14 on the horizontal pole 9, pre-buried pole 14 passes through the vertical connection of screw thread and horizontal pole 9, be equipped with diaphragm 13 on the pre-buried pole 14, diaphragm 13 is located the top of second holding ring 16, be equipped with first holding ring 11 on the diaphragm 13, the axis of first holding ring 11 and the axis of second holding ring 16 are on using a straight line, second steel pipe 12 is located first holding ring 11. Still be equipped with two first dead levers 10 on the outer wall of first retainer ring 11, first dead lever 10 passes through screw thread and 11 horizontal connection of first retainer ring to first dead lever 10 can fix the second steel pipe in first retainer ring 11. The bottom of pre-buried pole 14 is equipped with awl point 17, still be equipped with two solid fixed rings 8 on the pre-buried pole 14, gu fixed ring 18 is connected with pre-buried pole 14 through the screw thread to diaphragm 13 is located between two solid fixed rings 8.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A deep foundation pit dewatering construction method is characterized by comprising the following steps:
1) connecting a second steel pipe (12) of the water pumping pipe with a second positioning ring (16), then connecting a cross rod (9) with the second positioning ring (16), connecting a pre-embedded rod (14) with the cross rod (9) through threads, and fixing the pre-embedded rod (14) around the deep well (1);
2) the position of the support plate (6) is adjusted according to the diameter of the wellhead (1) of the deep well (1), so that the support plate (6) is tightly pressed on the inner wall of the wellhead;
3) the water suction pump (2) is placed into the deep well (1), and when the water suction pump (2) is placed into the deep well (1), the water suction pump (2) is protected by the anti-collision block (4);
4) connecting a transverse plate (13) with an embedded rod (14) through a fixing ring (8), and connecting a second steel pipe (12) of a water pumping pipe with a first positioning ring (11);
5) pumping underground water in the deep well (1) by using a water pump (2);
6) when the water suction pump (2) needs to be moved downwards, the first fixing rod (10) on the first positioning ring (11) and the second fixing rod (18) on the second positioning ring (16) are unscrewed, so that the second steel pipe (12) moves downwards, and the water suction pump (2) is guaranteed to be capable of pumping underground water at a low water level.
The water pump comprises a water suction pump (2) and a second positioning ring (16) of a circular ring structure, wherein a plurality of cross rods (9) are arranged on the outer wall of the circumference of the second positioning ring (16), supporting plates (6) are arranged on the cross rods (9), the supporting plates (6) can move on the cross rods (9) along the horizontal direction, and the supporting plates (6) are distributed at a wellhead in an annular array manner;
be equipped with the drinking-water pipe in second holding ring (16), the bottom and the suction pump (2) of drinking-water pipe are connected, still are equipped with a plurality of bolster (3) on the lateral wall of drinking-water pipe, bolster (3) are annular array and distribute on the lateral wall of drinking-water pipe, the one end and the drinking-water union coupling of bolster (3), all are equipped with anticollision piece (4) on the other end.
2. A deep foundation pit dewatering construction method according to claim 1, wherein the cross rods (9) penetrate through the support plate (6) and are connected with the second positioning rings (16) through threads, limiting nuts (15) are arranged on the cross rods (9), the limiting nuts (15) are connected with the cross rods (9) through threads, and the limiting nuts (15) are located on the inner side of the support plate (6).
3. A deep foundation pit dewatering construction method according to claim 1, wherein the cross section of the support plate (6) is an arc-shaped structure.
4. A deep foundation pit precipitation construction method according to claim 1, wherein the water pumping pipe comprises a first steel pipe (7), a hose (5) and a second steel pipe (12), two ends of the hose (5) are respectively connected with the first steel pipe (7) and the second steel pipe (12), the buffer member (3) is located on the outer wall of the first steel pipe (7), and the second steel pipe (12) is located in a second positioning ring (16).
5. A deep foundation pit dewatering construction method according to claim 4, wherein two second fixing rods (18) are further arranged on the outer wall of the second positioning ring (16), the second fixing rods (18) are respectively located on two sides of the axis of the second positioning ring (16), the second fixing rods (18) are located below the cross rod (9), the cross rod (9) is horizontally connected with the second positioning ring (16) through threads, and the cross rod (9) can fix the second steel pipe (12) in the second positioning ring (16).
6. The deep foundation pit dewatering construction method according to claim 4, wherein the cross rod (9) is further provided with embedded rods (14), the embedded rods (14) are vertically connected with the cross rod (9) through threads, the embedded rods (14) are provided with transverse plates (13), the transverse plates (13) are located above the second positioning rings (16), the transverse plates (13) are provided with first positioning rings (11), the central axes of the first positioning rings (11) and the central axes of the second positioning rings (16) are on the same straight line, and the second steel pipes (12) are located in the first positioning rings (11).
7. A deep foundation pit dewatering construction method according to claim 6, wherein the outer wall of the first locating ring (11) is further provided with two first fixing rods (10), the first fixing rods (10) are horizontally connected with the first locating ring (11) through threads, and the first fixing rods (10) can fix the second steel pipe in the first locating ring (11).
8. A deep foundation pit dewatering construction method according to claim 6, wherein the bottom of the embedded rod (14) is provided with a conical tip (17), the embedded rod (14) is further provided with two fixing rings (8), the fixing rings (18) are connected with the embedded rod (14) through threads, and the transverse plate (13) is located between the two fixing rings (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910750314.6A CN110629774B (en) | 2019-08-14 | 2019-08-14 | Deep foundation pit dewatering construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910750314.6A CN110629774B (en) | 2019-08-14 | 2019-08-14 | Deep foundation pit dewatering construction method |
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| Publication Number | Publication Date |
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| CN110629774A true CN110629774A (en) | 2019-12-31 |
| CN110629774B CN110629774B (en) | 2021-09-14 |
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| CN201910750314.6A Active CN110629774B (en) | 2019-08-14 | 2019-08-14 | Deep foundation pit dewatering construction method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205135972U (en) * | 2015-10-29 | 2016-04-06 | 温州捷高科技有限公司 | Anticollision deep water pump |
| CN206408962U (en) * | 2017-01-19 | 2017-08-15 | 毛玉平 | A kind of safety protection device of municipal road foundation pit |
| CN207079595U (en) * | 2017-07-01 | 2018-03-09 | 深圳市孺子牛建设工程有限公司 | A kind of Circular Pit supporting barricade supporting construction |
| CN207568943U (en) * | 2017-11-14 | 2018-07-03 | 保定中业水务科技有限公司 | A kind of deep well submerged pump easy to use |
-
2019
- 2019-08-14 CN CN201910750314.6A patent/CN110629774B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205135972U (en) * | 2015-10-29 | 2016-04-06 | 温州捷高科技有限公司 | Anticollision deep water pump |
| CN206408962U (en) * | 2017-01-19 | 2017-08-15 | 毛玉平 | A kind of safety protection device of municipal road foundation pit |
| CN207079595U (en) * | 2017-07-01 | 2018-03-09 | 深圳市孺子牛建设工程有限公司 | A kind of Circular Pit supporting barricade supporting construction |
| CN207568943U (en) * | 2017-11-14 | 2018-07-03 | 保定中业水务科技有限公司 | A kind of deep well submerged pump easy to use |
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| Publication number | Publication date |
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| CN110629774B (en) | 2021-09-14 |
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