CN113431029B - Grouting construction method for foundation pit waterproof curtain - Google Patents
Grouting construction method for foundation pit waterproof curtain Download PDFInfo
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- CN113431029B CN113431029B CN202110781392.XA CN202110781392A CN113431029B CN 113431029 B CN113431029 B CN 113431029B CN 202110781392 A CN202110781392 A CN 202110781392A CN 113431029 B CN113431029 B CN 113431029B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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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
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
Abstract
The invention relates to the technical field of constructional engineering, in particular to a grouting construction method of a foundation pit waterproof curtain, which comprises the following steps of: s1: construction preparation and advanced detection of water level of a foundation pit; s2: making a grouting water stop test section for determining grouting materials, grouting hole arrangement modes, grouting ranges and grouting pressures; s3: determining a waterproof curtain, drilling, inserting a grouting pipe into a curtain grouting hole, and plugging a grouting orifice; s4: grouting, namely pumping a grouting material into a grouting hole through a grouting pipe by using pressure equipment; s5: and (5) checking the grouting amount and the grouting pressure value, reaching the design requirements, stopping grouting, and sealing holes. The invention has good water stopping effect.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a grouting construction method of a foundation pit waterproof curtain.
Background
The waterproof curtain refers to a concept and is a general name of a waterproof series at the periphery of an engineering main body. The continuous water stopping body is used for preventing or reducing groundwater on the side wall of the foundation pit and the bottom of the foundation pit from flowing into the foundation pit and being adopted. In the foundation construction of the deep foundation pit, in order to protect the safety of the construction of an underground main structure and the surrounding environment of the foundation pit, measures such as temporary retaining, reinforcing, underground water control and the like are required to be adopted for the foundation pit. The waterproof curtain has the characteristics of scientific, economic, safe and green construction, so the waterproof curtain becomes the most widely applied scheme for treating underground water in foundation pit construction.
However, construction in urban centers with abundant underground water and high water level is affected by cement properties, geological conditions, construction technical level, construction quality control and other factors, curtain construction efficiency is low, water stopping effect cannot meet design requirements, and excavation and operation safety of foundation pits are seriously endangered.
Disclosure of Invention
The invention provides a grouting construction method of a foundation pit waterproof curtain aiming at the problems in the prior art and aims to solve the technical problems in the prior art.
The invention provides a grouting construction method of a foundation pit waterproof curtain, which adopts the following technical scheme:
a grouting construction method of a foundation pit waterproof curtain comprises the following steps:
s1: construction preparation and advanced detection of water level of a foundation pit;
s2: making a grouting water stop test section for determining grouting materials, grouting hole arrangement modes, grouting ranges and grouting pressures;
s3: determining a waterproof curtain, drilling, inserting a grouting pipe into a curtain grouting hole, and plugging a grouting orifice;
s4: grouting, namely pumping a grouting material into a grouting hole through a grouting pipe by using pressure equipment;
s5: checking the grouting amount and the grouting pressure value, stopping grouting when the design requirements are met, and sealing holes.
Preferably, in the step S3, the diameter of the grouting hole is 63mm, the length of the grouting section is 7m, the drilling angle of the grouting hole is 0 °, the diameter of the grout outlet is 5-6mm, and the axial distance along the pipe is 50 cm.
Preferably, in step S4, the grouting material is a time-varying grouting material with SJP viscosity.
Preferably, in the step S3, the grouting holes have a quincunx cross section.
Preferably, in the step S4, the grouting pressure is in the range of 1.0-2.0MPa during grouting.
Preferably, the grouting pipe comprises an outer pipe and an inner pipe movably inserted in the outer pipe, a first valve is arranged on the inner wall of the outer pipe, a second valve is arranged on the end face of the inner pipe, the first valve and the second valve are both arranged in a semicircular shape, a rotating shaft is rotatably connected at the circle center of the first valve and the circle center of the second valve, the second valve is attached to the first valve, and when the first valve and the second valve are aligned, the inner pipe and the outer pipe are in a communicated state; when the inner pipe rotates, the side edge of the second valve is driven to abut against the side edge of the first valve, and the inner pipe and the outer pipe are in a closed state;
the side wall of the outer pipe is provided with a plurality of liquid outlet holes, the side wall of the inner pipe is provided with communication holes, when the inner pipe and the outer pipe are in a communication state, the side wall of the inner pipe shields the liquid outlet holes, and when the inner pipe and the outer pipe are in a closed state, the communication holes are communicated with the liquid outlet holes;
the fixed ring flange that has cup jointed of one end lateral wall that the second valve was kept away from to the inner tube, ring flange protrusion in the outer peripheral face of outer tube, the equal circumference of two relative lateral walls of ring flange is encircleed and is set up the rotary trough, the outer tube is close to in the terminal surface of ring flange is provided with the change, the change with the rotary trough rotates and connects.
Preferably, a limit block is arranged on one side edge of the first valve, and when the second valve is closed to the first valve, the second valve abuts against the limit block.
Preferably, the length of the inner tube is 3 m.
Preferably, the outer pipe comprises two sections of connecting pipes, the outer peripheral surfaces of the two sections of connecting pipes close to one end are provided with threads, and a thread sleeve is connected between the two sections of connecting pipes in a threaded manner.
Preferably, a plum blossom disc is arranged on the outer peripheral surface of the outer pipe, the plum blossom disc is located at the first valve, and the plum blossom disc comprises a plurality of petal-shaped baffles.
In summary, the invention includes at least one of the following beneficial technical effects:
1. when the construction is carried out in an environment with complex geological conditions and high water content, a constructor firstly drills a grouting hole, then pumps grouting materials into the grouting hole through a grouting pipe by using a pump machine to fill the hole in the rock-soil body, replaces the air and water occupied in the soil body, changes the composition and the structure of the rock-soil body, forms a cementing body after the grouting materials are solidified, and improves the physical mechanical properties, particularly impermeability and bearing property of the cementing body, so that the waterproof and reinforcing engineering purpose is achieved, the grouting structure is suitable for the soil body with good permeability, and the grouting effect is better due to the adoption of the plum blossom-shaped grouting hole structure, and the water stopping effect is good after the water stopping curtain is formed; when the first grouting section is grouted, an operator inserts the grouting pipe into the grouting hole, the first valve and the second valve are in an open state, a pump pumps grouting materials into the grouting hole through the grouting pipe, the grouting hole is divided into two sections under the action of the quincunx disc, the grouting materials are not easy to flow into the second grouting section from the first grouting section, after the grouting of the first grouting section is completed, the operator rotates the flange disc by using a tool to drive the inner pipe to rotate, the first valve and the second valve are closed, the grouting materials are injected into the second grouting section, and the grouting materials are blocked from flowing into the first grouting section due to the existence of the quincunx disc, so that the grouting quality on complex geology is improved, and the water stopping effect is improved after the water stopping curtain is formed.
2. When the inner pipe is rotated by an operator, when the second valve abuts against the limiting block, the inner pipe is rotated to the right position, the second valve is completely closed on the first valve, when the operator opens the second valve, the inner pipe is rotated in the reverse direction by the operator, and when the second valve abuts against the limiting block, the first valve and the second valve are in the maximum opening state, so that grouting materials can better flow into the first grouting section.
3. Compared with the early-stage common cement paste or cement-water-glass double-liquid grouting, the water yield of the test adopting the SJP novel grouting material is reduced by 80%, which shows that the SJP novel grouting material can effectively block the underground water flow channel in the water-rich sand layer, thereby obviously reducing the water yield. Can effectively block the crack or the water flow channel under the condition of flowing water.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is an exploded view of the present invention.
FIG. 3 is a schematic view of the first valve and the second valve assembled together according to the present invention.
Fig. 4 is an exploded view of the outer tube of the present invention.
Fig. 5 is a schematic view showing an assembly relationship between the outer pipe, the flange and the inner pipe according to the present invention.
In the figure: 1. an outer tube; 11. a first valve; 111. a rotating shaft; 112. a limiting block; 12. a liquid outlet hole; 13. rotating the ring; 14. a connecting pipe; 15. a threaded sleeve; 16. a plum blossom plate; 161. a baffle plate; 17. a first grouting section; 18. a second grouting section; 2. an inner tube; 21. a second valve; 22. a communicating hole; 3. a flange plate; 31. and (6) rotating the groove.
Detailed Description
The present invention is described in further detail below with reference to figures 1-5.
When the tunnel is excavated, the geology of some tunnels mainly comprises silt, silt viscous soil, silty clay and a sand layer, the main stratum at the upper part of the tunnel is the silt and the silt clay which are brown yellow and slightly wet and have the thickness of about 10m, and the main stratum at the lower part of the tunnel is the silty clay and the sand layer which are yellow brown and saturated, mainly comprises medium sand and coarse sand, has the porosity of about 30 percent and the thickness of about 15m, and has high water content. The sand body is in a loose state and has poor wet cementation. The bottom of the tunnel is mainly a gravel layer. Wherein sand bed intensity is low, and self-stability ability is very poor after the excavation, easily collapses, and ground subsidence is difficult to control, and the in-hole sand gushing phenomenon takes place at the tunnel excavation in-process, leads to the construction unable to go on.
The embodiment of the invention discloses a grouting construction method of a foundation pit waterproof curtain, which comprises the following steps of:
s1: construction preparation and advanced detection of the water level of the foundation pit, conveying the punching machine and the pump machine to a construction site, and detecting the height of the water level.
S2: and making a grouting water stop test section for determining grouting materials, grouting hole arrangement modes, grouting ranges and grouting pressures.
S3: determining the construction range of the waterproof curtain, and performing drilling construction of a grouting hole by using a drilling machine, wherein the aperture of the grouting hole is 63mm, the length of the grouting section is 7m, the drilling angle of the grouting hole is 0 degrees (the drilling angle is 0 degree, which means that the drilling direction of the drilling machine is vertical to the plane to be drilled), and the section of the grouting hole is arranged in a quincunx shape; the diameter of the grout outlet is 5-6mm, the axial distance along the pipe is 50cm, in the embodiment, the diameter of the grout outlet is 5.5mm, then a grouting pipe is inserted into the curtain grouting hole, and the grouting hole opening is blocked.
S4: and (3) grouting, namely pumping a grouting material into a grouting hole through a grouting pipe by using a pump, wherein the grouting material is a SJP time-varying grouting material with the grouting pressure ranging from 1.0 to 2.0MPa, and in the embodiment, the grouting pressure is 1.5 MPa.
S5: checking the grouting amount and the grouting pressure value, stopping grouting after the design requirements are met, and sealing holes.
In the later stage, core drilling and coring are carried out on site by adopting a core drilling machine, the hole depth of the coring is 5m, the core from the hole opening to 2m is mainly cemented by cement, a small amount of tawny sandy soil is tawny sandy soil from 2m to 2.5m, the cementation degree is better, and the cemented by cement is mainly cemented from 2.5m to 4 m; silt and clay are used as main materials from 4m to 4.7m, and cement agglomeration is mainly used from 4.7m to 5 m. The coring rate is better and the slurry consolidation degree is higher on the whole.
Referring to fig. 1 and 2, during grouting, a specially-made grouting pipe of the invention is adopted, specifically, the grouting pipe comprises an outer pipe 1 and an inner pipe 2 arranged in the outer pipe 1, the length of the inner pipe 2 is 3m, the outer pipe 1 and the inner pipe 2 are coaxially arranged, the outer pipe 1 is movably sleeved on the inner pipe 2, the inner pipe 2 can rotate relative to the outer pipe 1, one end of the outer pipe 1 is arranged in a closed manner, the inner pipe 2 is positioned on one side of an open end of the outer pipe 1, the open end of the outer pipe 1 is communicated with a pump, a first valve 11 is welded on the inner wall of the outer pipe 1, the first valve 11 is positioned in the middle of the outer pipe 1, a second valve 21 is welded on the end face of the inner pipe 2 close to the first valve 11, the first valve 11 and the second valve 21 are both arranged in a semicircular manner, and the first valve 11 and the second valve 21 are identical in shape.
Referring to fig. 1 and 3, a rotating shaft 111 is disposed at the center of the first valve 11 and the second valve 21, one end of the rotating shaft 111 is rotatably supported at the center of the first valve 11, the other end of the rotating shaft 111 is rotatably supported at the center of the second valve, the second valve 21 is attached to the first valve 11, when the side edges of the first valve 11 and the second valve 21 are aligned with the arc edges, the first valve 11 and the second valve 21 are in an open state, the inner pipe 2 is in a communicating state with the outer pipe 1, and a grouting material flows into the outer pipe 1 through the inner pipe 2. When an operator rotates the inner tube 2 by one hundred eighty degrees, the inner tube 2 drives the second valve 21 to rotate, the side edge of the second valve 21 abuts against the side edge of the first valve 11, the first valve 11 and the second valve 21 are in a closed state, and the inner tube 2 and the outer tube 1 are in a separated state. The closed end of the outer pipe 1 is connected with the first grouting section 17 at the position of the first valve 11, the rest part of the outer pipe 1 is a second grouting section 18, the inner pipe 2 is arranged at the position of the second grouting section 18, and the length of the first grouting section 17 is 4 m. The second grouting section 18 is 3 m.
Referring to fig. 2 and 3, a plurality of liquid outlet holes 12 are formed through the sidewall of the outer tube 1, a plurality of communication holes 22 are formed through the sidewall of the inner tube 2, when the first valve 11 and the second valve 21 are opened, the inner tube 2 and the outer tube 1 are in a communication state, the grouting material flows into the first grouting section 17, the hole opening of the liquid outlet hole 12 corresponds to the sidewall of the inner tube 2, and the sidewall of the inner tube 2 covers the liquid outlet hole 12 of the second grouting section 18, so that the grouting material cannot flow into the second grouting section 18 from the liquid outlet. When the first valve 11 and the second valve 21 are closed, the inner pipe 2 and the outer pipe 1 are in a spaced state, the communication hole 22 is aligned with the liquid outlet hole 12, the communication hole 22 is communicated with the liquid outlet hole 12, and the grouting material can flow into the second grouting section 18 through the liquid outlet hole 12 and can not flow to the first grouting section 17 of the outer pipe 1 any more.
Referring to fig. 2 and 5, the fixed ring flange 3 that has cup jointed of one end lateral wall that the second valve 21 was kept away from to inner tube 2, ring flange 3 protrusion in the outer peripheral face of outer tube 1, ring flange 3 divides outer tube 1 into two parts of cutting off, the equal circumference of two relative lateral walls of ring flange 3 encircles and sets up the turn trough 31, outer tube 1 is close to the terminal surface integrated into one piece who is close to in ring flange 3 has change 13, change 13 activity is pegged graft in turn trough 31, change 13 rotates with turn trough 31 to be connected, and the part and the inner tube 2 fixed connection of outer tube 1 open end. And a sealing ring is bonded and fixed at the bottom of the rotary groove 31. An operator uses a tool to rotate the flange 3, and the flange 3 drives the inner pipe 2 to rotate, so as to drive the second valve 21 to open and close.
Referring to fig. 2 and 3, a quincuncial disc 16 is disposed on the outer circumferential surface of the outer tube 1, the quincuncial disc 16 is located at the first valve 11, the quincuncial disc 16 includes a plurality of petal-shaped baffles 161, in the present embodiment, the number of the baffles 161 is seven, the seven baffles 161 are welded on the outer circumferential surface of the outer tube 1 at intervals in the circumferential direction, so as to form the quincuncial disc 16, and the shape of the quincuncial disc 16 corresponds to the shape of the grouting hole.
Referring to fig. 2 and 3, in addition, in order to enable an operator to timely sense that the inner pipe 2 rotates to a proper position when rotating the inner pipe 2, a limit block 112 is welded to a side edge of the first valve 11, the limit block 112 is located on a surface of the first valve 11 facing the inner pipe 2, when the second valve 21 is closed on the first valve 11, a side edge of the second valve 21 abuts against the limit block 112, when the operator rotates the inner pipe 2, when the second valve 21 abuts against the limit block 112, it is described that the inner pipe 2 rotates to a proper position, the second valve 21 is completely closed on the first valve 11, when the operator opens the second valve 21, the operator reversely rotates the inner pipe 2, and when the second valve 21 abuts against the limit block 112, the first valve 11 and the second valve 21 are in a maximum opening state, so that the grouting material can better flow into the first grouting section 17.
Referring to fig. 2 and 4, in order to reduce the length of the outer tube 1, the outer tube 1 includes two connection tubes 14, a screw thread is provided on an outer circumferential surface of one end of the two connection tubes 14, and a screw sleeve 15 is screwed between the two connection tubes 14. After the operator connects one of the connecting pipes 14 to the threaded sleeve 15 in a threaded manner, the other connecting pipe 14 is connected to the other end of the threaded sleeve 15 in a threaded manner, so that the two connecting pipes 14 can be mounted together, the length of the outer pipe 1 is reduced, and the convenience in transportation is improved.
The implementation principle of the grouting construction method of the foundation pit waterproof curtain in the embodiment of the invention is as follows: when the construction is carried out in the environment with complex geological conditions and higher water content, a constructor firstly drills a grouting hole, then pumps grouting materials into the grouting hole through a grouting pipe by using a pump machine to fill the hole in the rock-soil body, replaces the air and water occupied in the soil body, changes the composition and the structure of the rock-soil body, forms a cementing body after the grouting materials are solidified, improves the physical mechanical properties, particularly impermeability and bearing property, so as to achieve the purposes of water prevention and reinforcement, is suitable for the soil body with better permeability, and has better grouting effect due to the adoption of the plum blossom-shaped grouting hole structure, has good water stopping effect after the water stopping curtain is formed, and is matched with the specially-made grouting pipe, when the grouting is carried out on a first grouting section, the operator inserts the grouting pipe into the grouting hole, and enables the first valve and the second valve to be in an open state, the pump machine passes through the slip casting pipe with grouting material and pumps in the slip casting downthehole, and because the effect of plum blossom plate, the slip casting hole is divided into two sections, grouting material is difficult for flowing into the second slip casting section from first slip casting section in, after accomplishing first slip casting section slip casting, operating personnel uses the instrument to rotate the ring flange, it rotates to drive the inner tube, make first valve and second valve closed, grouting material pours into the second slip casting section, and because the existence of plum blossom plate, separation grouting material flows into first slip casting section, thereby improved the slip casting quality in complicated geology, behind the stagnant water curtain formation, improve the stagnant water effect.
Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A grouting construction method of a foundation pit waterproof curtain is characterized by comprising the following steps: the method comprises the following steps:
s1: construction preparation and advanced detection of water level of a foundation pit;
s2: making a grouting water stop test section for determining grouting materials, grouting hole arrangement modes, grouting ranges and grouting pressures;
s3: determining a waterproof curtain, drilling a grouting hole, inserting a grouting pipe into the curtain grouting hole, and plugging a grouting orifice;
s4: grouting, namely pumping a grouting material into a grouting hole through a grouting pipe by using pressure equipment;
s5: checking the grouting amount and the grouting pressure value, stopping grouting when the design requirements are met, and sealing holes;
in the step S3, the section of the grouting hole is arranged in a quincunx shape,
the grouting pipe comprises an outer pipe (1) and an inner pipe (2) movably inserted into the outer pipe (1), a first valve (11) is arranged on the inner wall of the outer pipe (1), a second valve (21) is arranged on the end face of the inner pipe (2), the first valve (11) and the second valve (21) are both arranged in a semicircular shape, a rotating shaft (111) is rotatably connected to the circle centers of the first valve (11) and the second valve (21), the second valve (21) is attached to the first valve (11), and when the first valve (11) is aligned with the second valve (21), the inner pipe (2) and the outer pipe (1) are in a communicated state; when the inner pipe (2) rotates, the side edge of the second valve (21) is driven to abut against the side edge of the first valve (11), and the inner pipe (2) and the outer pipe (1) are in a closed state;
the side wall of the outer pipe (1) is provided with a plurality of liquid outlet holes (12), the side wall of the inner pipe (2) is provided with a communication hole (22), when the inner pipe (2) and the outer pipe (1) are in a communication state, the side wall of the inner pipe (2) is shielded on the liquid outlet holes (12), and when the inner pipe (2) and the outer pipe (1) are in a closing state, the communication hole (22) is communicated with the liquid outlet holes (12);
a flange plate (3) is fixedly sleeved on the side wall of one end, far away from the second valve (21), of the inner pipe (2), the flange plate (3) protrudes out of the outer peripheral surface of the outer pipe (1), rotating grooves (31) are circumferentially arranged on two opposite side walls of the flange plate (3) in a surrounding mode, a rotating ring (13) is arranged on the end face, close to the flange plate (3), of the outer pipe (1), and the rotating ring (13) is rotatably connected with the rotating grooves (31);
the outer peripheral surface of the outer pipe (1) is provided with a quincuncial disc (16), the quincuncial disc (16) is located at the first valve (11), and the quincuncial disc (16) comprises a plurality of petal-shaped baffles (161).
2. The grouting construction method of the waterproof curtain of the foundation pit according to claim 1, characterized in that: in the step S3, the aperture of the grouting hole is 63mm, the length of the grouting section is 7m, the drilling angle of the grouting hole is 0 degree, the diameter of the grout outlet hole is 5-6mm, and the axial distance along the pipe is 50 cm.
3. The grouting construction method of the waterproof curtain of the foundation pit according to claim 1, characterized in that: in the step S4, the grouting material is SJP viscosity time-varying grouting material.
4. The grouting construction method of the waterproof curtain of the foundation pit according to claim 1, characterized in that: in the step S4, the grouting pressure range is 1.0-2.0MPa during grouting.
5. The grouting construction method of the waterproof curtain of the foundation pit according to claim 1, characterized in that: a limit block (112) is arranged on one side edge of the first valve (11), and when the second valve (21) is closed on the first valve (11), the second valve (21) is abutted to the limit block (112).
6. The grouting construction method of the waterproof curtain of the foundation pit according to claim 1, characterized in that: the length of the inner pipe (2) is 3 m.
7. The grouting construction method of the waterproof curtain of the foundation pit according to claim 1, characterized in that: the outer pipe (1) comprises two connecting pipes (14), the outer peripheral surface of one end, close to each other, of each connecting pipe (14) is provided with threads, and a threaded sleeve (15) is connected between the two connecting pipes (14) in a threaded mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110781392.XA CN113431029B (en) | 2021-07-11 | 2021-07-11 | Grouting construction method for foundation pit waterproof curtain |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110781392.XA CN113431029B (en) | 2021-07-11 | 2021-07-11 | Grouting construction method for foundation pit waterproof curtain |
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| CN113431029B true CN113431029B (en) | 2022-06-21 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000234328A (en) * | 1999-02-16 | 2000-08-29 | Kyokado Eng Co Ltd | Grout injection device and method |
| CN110644934A (en) * | 2019-11-18 | 2020-01-03 | 中铁电气化局集团有限公司 | Advanced grouting drill rod |
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2021
- 2021-07-11 CN CN202110781392.XA patent/CN113431029B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000234328A (en) * | 1999-02-16 | 2000-08-29 | Kyokado Eng Co Ltd | Grout injection device and method |
| CN110644934A (en) * | 2019-11-18 | 2020-01-03 | 中铁电气化局集团有限公司 | Advanced grouting drill rod |
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| CN113431029A (en) | 2021-09-24 |
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