CN110500126A - Hollow bolt filling adaptor and hollow bolt construction technology - Google Patents
Hollow bolt filling adaptor and hollow bolt construction technology Download PDFInfo
- Publication number
- CN110500126A CN110500126A CN201910892949.XA CN201910892949A CN110500126A CN 110500126 A CN110500126 A CN 110500126A CN 201910892949 A CN201910892949 A CN 201910892949A CN 110500126 A CN110500126 A CN 110500126A
- Authority
- CN
- China
- Prior art keywords
- hollow bolt
- filling adaptor
- inner sleeve
- outer tube
- grouting pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010276 construction Methods 0.000 title claims abstract description 24
- 238000005516 engineering process Methods 0.000 title claims abstract description 7
- 238000007569 slipcasting Methods 0.000 claims abstract description 37
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 239000002002 slurry Substances 0.000 claims description 15
- 238000003466 welding Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000004568 cement Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 229920002472 Starch Polymers 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 238000009955 starching Methods 0.000 description 2
- 101100366060 Caenorhabditis elegans snap-29 gene Proteins 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Lining And Supports For Tunnels (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention discloses a kind of hollow bolt filling adaptors, including inner sleeve and outer tube, front and back is arranged at intervals with limited step and Grouting Pipe binding slot on the outer wall of the inner sleeve, thread segment is divided into before and after the inner wall of the outer tube, unthreaded hole section and necking section, the thread segment is used to screw fixation with the ends screw of hollow bolt, the diameter of unthreaded hole section is greater than thread segment, the diameter of necking section, the housing pipe sleeve is on interior casing, limited step can slide in unthreaded hole section, realize back-and-forth motion of the outer tube with respect to inner sleeve, the front end of the inner sleeve is provided with conical head, the internal diameter of hollow bolt is between the internal diameter and outer diameter of conical head, conical head is partially inserted into hollow bolt and realizes Butt sealing.Meanwhile the invention also discloses a kind of hollow bolt construction technologies.It is easy to operate, practical, save the cost, safe and reliable when carrying out empty anchor bolt construction using the filling adaptor, connector spillage can be prevented, it is ensured that slip casting is full, avoids plugging, booster.
Description
Technical field
The invention belongs to technical field of tunnel construction, and in particular to use when a kind of pair of tunnel hollow bolt progress slip casting
Filling adaptor, and the technique for carrying out hollow bolt construction using the filling adaptor.
Background technique
Hollow bolt is widely used in constructing tunnel, for example, main cavern's anchor pole take Φ 28*5.5mm, long 6m specification it is general
Logical hollow bolt.The quality critical of hollow bolt is bolt grouting, and the plumpness of slip casting directly affects whether rockbolt installation closes
Lattice, full slip casting is to starch so that anchor pole hole wall is counter as judgment basis.Grouting Pipe is connected with hollow bolt by filling adaptor, and slip casting
The connecting portion where filling adaptor plays key effect in the process.
Fig. 5 show the filling adaptor generally used during cave depot bolt grouting, by adapter tube bolt 5,6 groups of adapter tube of auxiliary
At.The leading portion of adapter tube bolt 5 is provided with internal screw thread and connect for screwing with the external screw thread of hollow bolt 3, the back segment of adapter tube bolt 5
It is provided with external screw thread to connect for screwing with the internal screw thread of auxiliary 6 leading portion of adapter tube, if being provided on the outer wall of auxiliary 6 back segment of adapter tube
Dry annular groove, 4 sets of Grouting Pipe in annular groove section and binding and fixing, the cross section of annular groove are that pawl can prevent from binding
Grouting Pipe 4 afterwards exits.Two operating stick 5a are also welded on the outer wall of adapter tube bolt 5.Its purpose is to every for hollow bolt 3
Secondary remove is equivalent between hollow bolt 3 and Grouting Pipe 4 in addition to binding position there are two interface, and spillage is tighter during slip casting
Weight, anti-effect of starching is not fine.
Illustrate main problem existing for the structure in terms of following four:
1, operational
The precession or when screwing out from hollow bolt by filling adaptor, Grouting Pipe from rotating with it and knots to prevent, then
Before the slip casting for carrying out next hollow bolt, need filling adaptor and Grouting Pipe to separate carry out again binding is combined ability slip casting,
It is very troublesome.Also, filling adaptor with hollow bolt none it is corresponding to interface, reserving gaps are larger, interface is more, is difficult
It is whole to form a closure, slip casting each time has to manpower and helps operating stick, operates in entire use process more complicated.
2, practicability
Two interface spillages are than more serious during slip casting, lead to when slip casting in hollow bolt hole the anti-effect starched not
It is very well, slip casting is not full；Spillage also results in that operating platform sizing liquor is too many, is unfavorable for the operating and cleaning of equipment, such as pulp
Liquid the case where being frequently present of plugging, is caused time-consuming and laborious by design mixture proportion stirring.
3, economy
Spillage causes the consumption of cement to increase than more serious during slip casting, 6 meters of hollow bolt, and scene is practical
The bagged cement energy of 50kg slip casting 2-3, linear meter(lin.m.) waste are larger (note: the proportion of water and cement is 0.45:1).
4, safety
Operator needs to help filling adaptor, and slip casting machine has certain pressure during slip casting, because joint is docked
It is not in place, blocking is easy to appear in the position of auxiliary adapter tube, grouting pressure and inner air tube is excessive is easy to cause booster, to operation
Personnel have some potential safety problems, and have certain damage to equipment.
Summary of the invention
The present invention is intended to provide a kind of economic, practical, highly-safe, easy to operate hollow bolt filling adaptor, can prevent
Only connector spillage, it is ensured that slip casting is full, avoids plugging, booster.
For this purpose, the technical scheme adopted by the invention is as follows: a kind of hollow bolt filling adaptor, including inner sleeve and housing
Pipe, front and back is arranged at intervals with limited step and Grouting Pipe binding slot on the outer wall of the inner sleeve, before the inner wall of the outer tube
After be divided into thread segment, unthreaded hole section and necking section, the thread segment is used to screw fixation, light with the ends screw of hollow bolt
The diameter of hole section is greater than the diameter of thread segment, necking section, and for the housing pipe sleeve on interior casing, limited step can be in unthreaded hole section
Back-and-forth motion of the outer tube with respect to inner sleeve is realized in sliding, and the front end of the inner sleeve is provided with conical head, hollow bolt it is interior
Diameter enables conical head to be partially inserted into hollow bolt and realizes Butt sealing between the internal diameter and outer diameter of conical head.
The outer tube uses two sections of front and back to be welded as a preferred embodiment of the above solution, and welding surface just constitutes light
The front end face of hole section.Using two-part welding structure, facilitate processing and manufacturing, welding surface is arranged in the initial position of unthreaded hole section
Place, the outer tube integral strength closer to the middle part of outer tube, after can guarantee welding.
Further preferably, the left and right sides of the outer wall of the outer tube is opposite is welded with gripping baffle, the holding stop
Two sections of weld seam intersects vertically before and after the weld seam of piece and outer tube.Gripping baffle is added, operator is more advantageous to and is wearing rubber
Filling adaptor is tightened in the case where Rubber gloves；The weld seam of baffle is held across two sections before and after outer tube, more can ensure that integral strength.
Meanwhile the present invention also provides a kind of hollow bolt construction technologies, comprising the following steps:
The first step, anchor pole hole location setting-out；
Second step, bolthole drilling and forming hole；
Third step, installation hollow bolt；
Hollow bolt is connected by the 4th step by filling adaptor with Grouting Pipe；
5th step, hollow bolt slip casting；
6th step, filling adaptor are separated with the end of hollow bolt；
7th step, the construction for carrying out next hollow bolt, until the construction of all hollow bolts finishes；
Above-mentioned hollow bolt filling adaptor is used in 4th step, first by the outer tube of filling adaptor with respect to inner sleeve
It slides backward, exposes the conical head of inner sleeve and be partially inserted into the end inner hole of hollow bolt to realize Butt sealing, then to
Before turn outer tube and be locked together by the external screw thread of thread segment and hollow bolt, to realize filling adaptor and middle spare anchor
The connection of bar；The rear end of inner sleeve is inserted in the front end of the Grouting Pipe, and is fixed on Grouting Pipe by steel wire lashing and binds on slot,
To realize the connection of filling adaptor and Grouting Pipe；The connection of filling adaptor and hollow bolt both can be in filling adaptor and slip casting
It carries out, can also be carried out after the connection of filling adaptor and Grouting Pipe before the connection of pipe；
In 5th step, air when slip casting in filling adaptor is under the pressure of slurries directly along hollow bolt inner hole
It is flowed out again through hollow bolt outer wall, until the anti-slurry of the full formation of slurries, slip casting are completed；
In 6th step, when filling adaptor is separated with the end of hollow bolt, do not need Grouting Pipe from filling adaptor
On remove, first turn outer tube backward and separate thread segment with the external screw thread of hollow bolt, inner sleeve does not rotate at this time, then will in
The conical head of casing takes out from the end inner hole of hollow bolt；
In 7th step, when carrying out the construction of next hollow bolt, it is only necessary to filling adaptor and corresponding hollow bolt
Connection does not need the connection for carrying out filling adaptor and Grouting Pipe.
The utility model has the advantages that the filling adaptor is easy to operate, practical, save the cost, safe and reliable, it is embodied in following
Aspect:
1, operational
Filling adaptor is an entirety, and the front end of connector and hollow bolt reserve end by threaded engagement, after connector
End and Grouting Pipe binding and fixing, since the opposite inner sleeve of outer tube energy rotates 360 °, then outer tube and hollow bolt phase
It can be rotated at random after connecing and link closely with hollow bolt according to the actual situation, the activity for making three form a closure is whole, when installation
It will realize and dock in the conical head insertion hollow bolt of inner sleeve first, then outer tube is released forward with respect to inner sleeve, make outer
The thread segment is exposed and passed through to casing threads section and the ends screw of hollow bolt screws fixation, and ensure Grouting Pipe binding including
On the Grouting Pipe binding slot of casing, slip casting for the first time can be carried out, does not have to worry that Grouting Pipe knots in outer tube rotation process, slip casting
It when carrying out the slip casting of next hollow bolt after the completion, does not need to remove Grouting Pipe yet and is bound again, operating seems more
Add simple.
2, practicability
The front end of inner sleeve is provided with conical head, the internal diameter of hollow bolt between the internal diameter and outer diameter of conical head,
Conical head is partially inserted into hollow bolt and realizes Butt sealing, it is close conducive to underflow is pressed into the inner hole to hollow bolt
Closing property is stronger, and slip casting process center tap will not spillage, it is ensured that the plumpness of slip casting, and worker can obviously judge that anchor pole is anti-
Starch the time.One hole slip casting deadline also shortens nearly half the time than before and (improves previous hole and need 50 seconds or so, change
Into rear need 30 seconds or so).
3, economy
The airtightness of the filling adaptor is preferable, and slurries will not be omitted easily, same 6 meters of anchor pole, the bagged cement of 50kg
Can be note 4~5, the anchor pole than every 6 meters before improving can save the bagged cement of 6kg or so, be equivalent to every linear meter(lin.m.) and save 1kg
The bagged cement of (0.56 yuan), has saved cost, and reached slip casting effect.
4, safety
After improvement, when carrying out the construction of hollow bolt by the filling adaptor, construction personnel infuses without helping filling adaptor
Slurry connector and Grouting Pipe be initially formed an entirety, because the conical head of inner sleeve is relatively large in diameter, directly with hollow bolt inner hole pair
It connects, then is nested by the thread segment of movable outer tube with hollow bolt, pressure of air when slip casting in filling adaptor in slurries
It is directly flowed out again through hollow bolt outer wall along hollow bolt inner hole under power, until the anti-slurry of the full formation of slurries, effectively prevents
Spillage, plugging and booster reduce security risk and the influence to equipment.
Tie it is described, when which is used for the construction of hollow bolt, can preferably embody it is easy to operate, practical,
Save the cost, safe and reliable characteristic, can prevent connector spillage, it is ensured that slip casting is full, avoids plugging, booster.
Detailed description of the invention
Fig. 1 is the main view of this hollow bolt filling adaptor.
Fig. 2 is the A-A cross-sectional view of Fig. 1.
Fig. 3 is perspective view of the invention.
Fig. 4 is hollow bolt construction technology process schematic diagram.
Fig. 5 is the usage state diagram of existing filling adaptor.
Specific embodiment
By way of example and in conjunction with the accompanying drawings, the invention will be further described:
In conjunction with shown in Fig. 1-3, a kind of hollow bolt filling adaptor is mainly made of inner sleeve 1 and outer tube 2.
Front and back is arranged at intervals with limited step 1a and Grouting Pipe binding slot 1b on the outer wall of inner sleeve 1.
Thread segment 2a, unthreaded hole section 2b and necking section 2c are divided into before and after the inner wall of outer tube 2.Thread segment 2a is used for in
The ends screw of spare anchor bar screws fixation, and the ends screw of hollow bolt is external screw thread.The diameter of unthreaded hole section 2b is greater than thread segment
The diameter of 2a, necking section 2c, 2 sets of outer tube on inner sleeve 1, limited step 1a can be slided in unthreaded hole section 2b, realize housing
Back-and-forth motion of the pipe 2 with respect to inner sleeve 1.The back-and-forth motion amount of the opposite inner sleeve 1 of outer tube 2, is determined by the length of unthreaded hole section 2b,
It is designed according to the ends screw section of hollow bolt.
The front end of inner sleeve 1 is provided with conical head 1c, the internal diameter of hollow bolt between conical head 1c internal diameter and outer diameter it
Between, conical head 1c is partially inserted into hollow bolt and realizes Butt sealing.
Preferably, outer tube 2 uses two sections of front and back to be welded, and welding surface just constitutes the front end face of unthreaded hole section 2b,
So that welding surface is closer to the middle part of outer tube 2.
In addition, opposite be welded in the left and right sides of the outer wall of outer tube 2 holds baffle 2d, the weld seam of baffle 2d and outer is held
The weld seam of 2 two sections of front and back of casing intersects vertically, so that each leading portion for holding baffle 2d is welded on 2 leading portion of outer tube, holds
The back segment of baffle 2d is welded on 2 back segment of outer tube.
In conjunction with shown in Fig. 1-Fig. 4, a kind of hollow bolt construction technology, comprising the following steps:
The first step, anchor pole hole location setting-out.
Second step, bolthole drilling and forming hole.
Third step, installation hollow bolt.
Hollow bolt is connected by the 4th step by filling adaptor with Grouting Pipe.Above-mentioned hollow bolt is used in the step
Filling adaptor first slides backward the outer tube of filling adaptor 2 with respect to inner sleeve 1, and the conical head 1c of inner sleeve 1 is made to expose simultaneously office
Portion insertion hollow bolt end inner hole in realize Butt sealing, turn further along outer tube 2 and by thread segment 2a with it is hollow
The external screw thread of anchor pole is locked together, to realize the connection of filling adaptor and hollow bolt.It is inserted in inner sleeve in the front end of Grouting Pipe
The rear end of pipe 1, and Grouting Pipe is fixed on by steel wire lashing and is bound on slot 1b, to realize the company of filling adaptor and Grouting Pipe
It connects.The connection of filling adaptor and hollow bolt can both carry out before the connection of filling adaptor and Grouting Pipe, can also infuse
The connection for starching connector and Grouting Pipe carries out later.
5th step, hollow bolt slip casting.When slip casting, the air in filling adaptor is under the pressure of slurries directly along hollow
Anchor pole inner hole is flowed out through hollow bolt outer wall again, until the anti-slurry of the full formation of slurries, slip casting are completed.
6th step, filling adaptor are separated with the end of hollow bolt.When filling adaptor is separated with the end of hollow bolt, no
It needs to remove Grouting Pipe from filling adaptor, first turning outer tube 2 backward makes the external screw thread of thread segment 2a and hollow bolt point
From inner sleeve 1 does not rotate at this time, then the conical head 1c of inner sleeve 1 is taken out from the end inner hole of hollow bolt.
7th step, the construction for carrying out next hollow bolt, until the construction of all hollow bolts finishes.Carry out next middle spare anchor
When the construction of bar, it is only necessary to which filling adaptor is connected with corresponding hollow bolt, does not need to carry out filling adaptor and Grouting Pipe
Connection.I.e. except the binding for before first hollow bolt slip casting, needing to carry out filling adaptor and Grouting Pipe connects, remaining hollow bolt
When construction, the binding for no longer needing to carry out filling adaptor and Grouting Pipe is connected, and can improve construction efficiency and repeatedly
Occurs the loosening at lashing location in binding, it is only necessary to bind for the first time firm.
Claims (4)
1. a kind of hollow bolt filling adaptor, it is characterised in that: including inner sleeve (1) and outer tube (2), the inner sleeve (1)
Outer wall on front and back be arranged at intervals with limited step (1a) and Grouting Pipe binding slot (1b), the outer tube (2) inner wall front and back
It is divided into thread segment (2a), unthreaded hole section (2b) and necking section (2c), the thread segment (2a) is for the end with hollow bolt
Threaded engagement is fixed, and the diameter of unthreaded hole section (2b) is greater than the diameter of thread segment (2a), necking section (2c), outer tube (2) set
On inner sleeve (1), limited step (1a) can slide in unthreaded hole section (2b), realize outer tube (2) with respect to before inner sleeve (1)
After move, the front end of the inner sleeve (1) is provided with conical head (1c), the internal diameter of the internal diameter of hollow bolt between conical head (1c)
Between outer diameter, so that conical head (1c) can be partially inserted into hollow bolt and realize Butt sealing.
2. hollow bolt filling adaptor described in accordance with the claim 1, it is characterised in that: the outer tube (2) uses front and back two
Section is welded, and welding surface just constitutes the front end face of unthreaded hole section (2b).
3. hollow bolt filling adaptor according to claim 2, it is characterised in that: a left side for the outer wall of the outer tube (2)
Opposite be welded in right two sides holds baffle (2d), two sections of weld seam before and after the weld seam for holding baffle (2d) and outer tube (2)
It intersects vertically.
4. a kind of hollow bolt construction technology, comprising the following steps:
The first step, anchor pole hole location setting-out；
Second step, bolthole drilling and forming hole；
Third step, installation hollow bolt；
Hollow bolt is connected by the 4th step by filling adaptor with Grouting Pipe；
5th step, hollow bolt slip casting；
6th step, filling adaptor are separated with the end of hollow bolt；
7th step, the construction for carrying out next hollow bolt, until the construction of all hollow bolts finishes；
It is characterized by:
Using hollow bolt filling adaptor described in any one of claim 1-3 in 4th step, first by filling adaptor
Outer tube (2) is slided backward with respect to inner sleeve (1), and the conical head (1c) of inner sleeve (1) is made to expose and be partially inserted into hollow bolt
End inner hole in realize Butt sealing, turn outer tube (2) further along and by the outer spiral shell of thread segment (2a) and hollow bolt
Line is locked together, to realize the connection of filling adaptor and hollow bolt；It is inserted in inner sleeve (1) in the front end of the Grouting Pipe
Rear end, and be fixed in Grouting Pipe binding slot (1b) by steel wire lashing, to realize the connection of filling adaptor and Grouting Pipe；Note
The connection of slurry connector and hollow bolt can both carry out before the connection of filling adaptor and Grouting Pipe, can also be in filling adaptor
It is carried out after connection with Grouting Pipe；
In 5th step, air when slip casting in filling adaptor is directly passed through along hollow bolt inner hole again under the pressure of slurries
Hollow bolt outer wall outflow, until the anti-slurry of the full formation of slurries, slip casting are completed；
In 6th step, when filling adaptor is separated with the end of hollow bolt, do not need to take Grouting Pipe from filling adaptor
Under, first turning outer tube (2) backward separates thread segment (2a) with the external screw thread of hollow bolt, and inner sleeve (1) does not rotate at this time,
The conical head (1c) of inner sleeve (1) is taken out from the end inner hole of hollow bolt again；
In 7th step, when carrying out the construction of next hollow bolt, it is only necessary to which filling adaptor is connected with corresponding hollow bolt
, do not need the connection for carrying out filling adaptor and Grouting Pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910892949.XA CN110500126B (en) | 2019-09-20 | 2019-09-20 | Grouting joint for hollow anchor rod and construction process for hollow anchor rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910892949.XA CN110500126B (en) | 2019-09-20 | 2019-09-20 | Grouting joint for hollow anchor rod and construction process for hollow anchor rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110500126A true CN110500126A (en) | 2019-11-26 |
| CN110500126B CN110500126B (en) | 2024-03-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910892949.XA Active CN110500126B (en) | 2019-09-20 | 2019-09-20 | Grouting joint for hollow anchor rod and construction process for hollow anchor rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110500126B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111877566A (en) * | 2020-08-07 | 2020-11-03 | 山东建筑大学 | Microbial grouting anchoring method and structure for grouting in cavity |
| WO2022007694A1 (en) * | 2020-07-06 | 2022-01-13 | 青岛理工大学 | Grouting apparatus for highly coagulative grouting material |
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| CN111877566A (en) * | 2020-08-07 | 2020-11-03 | 山东建筑大学 | Microbial grouting anchoring method and structure for grouting in cavity |
| CN111877566B (en) * | 2020-08-07 | 2021-07-16 | 山东建筑大学 | Microbial grouting anchoring method and structure for grouting in cavity |
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