CN113217026A - Construction method for secondary grouting of tunnel leading large pipe shed - Google Patents
Construction method for secondary grouting of tunnel leading large pipe shed Download PDFInfo
- Publication number
- CN113217026A CN113217026A CN202110559207.2A CN202110559207A CN113217026A CN 113217026 A CN113217026 A CN 113217026A CN 202110559207 A CN202110559207 A CN 202110559207A CN 113217026 A CN113217026 A CN 113217026A
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- pipe
- grouting
- shed
- construction method
- pipe shed
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- 238000010276 construction Methods 0.000 title claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- 238000007569 slipcasting Methods 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims description 16
- 238000005553 drilling Methods 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 239000011083 cement mortar Substances 0.000 claims description 3
- 239000011435 rock Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 description 15
- 239000011440 grout Substances 0.000 description 5
- 230000000977 initiatory effect Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 3
- 230000008093 supporting effect Effects 0.000 description 3
- 239000000284 extract Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The utility model relates to a construction method for advance big pipe-shed secondary slip casting of tunnel belongs to the technical field that the tunnel was strutted, it includes through one, secondary slip casting pipe and integral slip casting valve, the big steel pipe of cooperation diameter 108mm, accomplish the full length primary slip casting and radial pressure splitting secondary slip casting to tunnel length direction, increased radial grouting volume on the basis of traditional tunnel advance slip casting, improved the stability of country rock, further ensured tunnel construction's safety.
Description
Technical Field
The application relates to the technical field of tunnel support, in particular to a construction method for secondary grouting of a tunnel advanced large pipe shed.
Background
At present, the advance support of the tunnel pipe shed is generally to drive a steel pipe into a stratum along a drill hole outside an excavation outline, and combine the steel pipe with a steel arch frame to form a shed frame pre-support reinforcing system for supporting the load from the upper part of the pipe shed. The pressurized cement slurry flows into the stratum through the grouting holes arranged in a quincunx shape on the steel pipe so as to reinforce the weak and broken stratum and improve the self-stability of the stratum. .
The pipe shed grouting is a long-distance advanced support method, has long advance distance and larger rigidity, is suitable for the stratum with the tunnel face incapable of self-stabilizing and containing water, has better effects of controlling the ground surface settlement and preventing seepage and stopping water, but has higher process requirements.
After the pipe shed steel pipe is driven into the stratum to be in place, grouting is conducted into the steel pipe, the steel pipe is provided with penetration holes, and the inside of the steel pipe is filled with the grout to penetrate into surrounding soil, so that the steel pipe and the surrounding soil are compact, the rigidity of the steel pipe is increased, and the supporting strength is enhanced.
In view of the above-mentioned related technologies, the inventor believes that although the small conduit can be used as a supplement for grouting the stratum between the adjacent large pipe sheds, the small conduit and the large pipe sheds are not integrated, integrity is lacked, grouting effect is affected, and grouting holes formed in the steel pipes are small, so that grout is easily blocked, and grouting effect is affected.
Disclosure of Invention
In order to combine together the primary grouting and the secondary pressure grouting of the large pipe shed, guarantee the grouting effect, improve the bearing capacity of the surrounding rock of the tunnel and enhance the safety, the application provides a construction method for the secondary grouting of the advanced large pipe shed of the tunnel.
The application provides a construction method for tunnel advance big pipe roof secondary slip casting adopts following technical scheme:
s1: drilling the drilled hole before grouting is finished;
s2: connecting a grouting valve for secondary pressure grouting on the large steel pipe of the pipe shed to form an integral structure, penetrating a primary grouting pipe and a secondary grouting pipe into the integral structure, penetrating the secondary grouting pipe into the grouting valve, communicating the grouting valve with the outside of the large steel pipe of the pipe shed, and then driving the integral structure into a drill hole;
s3: primary grouting is carried out on the integral structure through a primary grouting pipe;
s4: and after the initial setting and before the final setting of the cement mortar, performing secondary grouting on the integral structure through a secondary grouting pipe.
Through adopting above-mentioned technical scheme, once slip casting combines together with secondary slip casting, has saved the process, and twice slip casting contact is inseparable, has practiced thrift the passageway space, and secondary slip casting has guaranteed the slip casting effect to surrounding rock around the big steel pipe of pipe shed, and the existence of the big steel pipe of cooperation pipe shed reaches the bearing capacity that improves tunnel surrounding rock, the effect of reinforcing security.
Optionally, the slip casting valve includes shell and case, and the case is fixed inside the shell, and the shell is cylindricly, and shell one end is connected with the big steel pipe of pipe shed, has seted up through-hole and blind hole on the case, and the through-hole runs through the case along shell length direction, and drilling depths one side intercommunication is kept away from with the case to blind hole one end, and the other end communicates with the big steel pipe outside of pipe shed, and secondary slip casting pipe stretches into to blind hole department.
Through adopting above-mentioned technical scheme, once the slip casting pipe leads to long one-shot slip casting to overall structure, carries out the non-through long slip casting of secondary to the device through the secondary slip casting pipe before the final set after the thick liquid initial set, reaches and parts one-shot slip casting pipe and secondary slip casting pipe in order, and twice slip casting does not influence each other, and the through-hole is used for the slip casting of first time promptly, and the blind hole is used for the slip casting of second time, does not need extra little pipe to supply the effect of slip casting.
Optionally, the blind hole is located at a center line of the large steel pipe of the pipe shed, the through holes are formed in a plurality of numbers, and all the through holes are formed in a circular shape with the blind hole as the center and in equal central angles.
Through adopting above-mentioned technical scheme, the efficiency of the slip casting for the first time has been accelerated in seting up of a plurality of through-holes, has promoted the even effect of the slip casting for the first time, and the setting of through-hole and blind hole position has abundant utilization the space of slip casting valve.
Optionally, the outer shell and the valve core are integrally formed, the outer shell is made of a steel pipe with a diameter of phi 108, and the diameter of the through hole is phi 12.
Through adopting above-mentioned technical scheme, the slip casting valve is formed by cylindrical steel direct processing, need not the concatenation, and the wholeness is good.
Optionally, the inner wall of the blind hole is provided with threads, and the secondary grouting pipe is in threaded connection with the blind hole.
Through adopting above-mentioned technical scheme, secondary slip casting pipe and blind hole threaded connection avoid droing of secondary slip casting pipe, guarantee secondary pressure slip casting's effect.
Optionally, the primary grouting pipe is pulled out at a constant speed or is left in the large steel pipe of the pipe shed after grouting.
By adopting the technical scheme, the primary grouting pipe is pulled out after grouting is finished, so that the effect of recycling resources is realized, and materials are saved; the primary grouting pipe is not pulled out after grouting is finished, so that the working procedures are saved, and the retention of the primary grouting pipe does not influence the supporting effect on the rock mass of the tunnel.
Optionally, after the secondary grouting is finished, the secondary grouting pipe is pulled out or left in the large steel pipe of the pipe shed.
Through adopting above-mentioned technical scheme, the effect that secondary slip casting pipe was extracted or was left is the same with primary slip casting pipe, selects according to the construction operating mode, extracts the reuse who realizes the resource, saves construction cost, does not extract and realizes saving the process for the effect of construction process.
Optionally, the blind hole runs through the big steel pipe of pipe canopy and external intercommunication department, is provided with a plurality ofly along shell circumference outer wall equidistance.
Through adopting above-mentioned technical scheme, the blind hole is a plurality of terminal points by an initial point then branch, makes secondary slip casting carry out abundant slip casting to the country rock around the big steel pipe of pipe shed, promotes the slip casting effect, promotes slip casting efficiency simultaneously.
Optionally, the housing is provided with a sunken groove, the sunken groove is located at a position where the blind hole penetrates through the large steel pipe of the pipe shed, the circle center of the sunken groove coincides with the circle center of the position where the blind hole penetrates through the large steel pipe of the pipe shed, and the diameter of the sunken groove is larger than that of the blind hole.
Through adopting above-mentioned technical scheme, the setting up of sunken groove provides fixed position for follow-up dress waterproof rubber ring or similar waterproof part, and after the slip casting once, partial thick liquid permeates the country rock on every side in the hole of the big steel pipe of pipe shed self, and there is the clearance in the big steel pipe outer wall of pipe shed and the drilling inner wall, and the thick liquid can be full of the clearance, and the follow-up smooth and easy secondary slip casting that carries on of blind hole is guaranteed in the thick liquid recharge blind hole in the waterproof rubber ring structure avoids the clearance.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the primary grouting and the secondary pressure grouting are combined, so that the connection is tight, the channel space is saved, the grouting effect is ensured, and the bearing capacity of the tunnel surrounding rock is improved;
2. the primary grouting pipe and the secondary grouting pipe can be recycled;
3. the grouting valve is directly processed by cylindrical steel, does not need splicing and has good integrity.
Drawings
FIG. 1 is a schematic overall structure diagram of secondary grouting of a tunnel large pipe shed in the application;
FIG. 2 is a schematic structural view of one end of a grouting valve;
FIG. 3 is a schematic view of another end structure of the grouting valve;
fig. 4 is an enlarged view of a portion a of fig. 1.
In the figure, 1, a primary grouting pipe; 2. a secondary grouting pipe; 3. a large steel pipe of the pipe shed; 4. a grouting valve; 41. a housing; 42. a valve core; 5. a through hole; 6. blind holes; 61. and (4) sinking the groove.
Detailed Description
The present application is described in further detail below with reference to figures 1-4.
The embodiment of the application discloses a construction method for secondary grouting of a tunnel advancing large pipe shed.
Referring to fig. 1 and 2, a construction method for secondary grouting of a tunnel leading large pipe shed comprises the following steps: s1: and after the hole position is measured, the drilling machine is put in place, and then the hole is drilled.
S2: the large steel pipe 3 of the pipe shed is connected with a grouting valve 4, the grouting valve 4 is used for secondary pressure grouting, the grouting valve 4 comprises a shell 41 and a valve core 42, the shell 41 is made of a steel pipe with the diameter of 108, the shell 41 and the valve core 42 are integrally manufactured, the valve core 42 is positioned in the middle of the shell 41 and is spaced from the two ends of the shell 41, and the inner walls of the two ends of the shell 41 are provided with threads for being in threaded connection with the large steel pipe 3 of the pipe shed.
Referring to fig. 3, the valve core 42 is provided with three through holes 5 and three blind holes 6, the blind hole 6 is provided with one through hole 5, and the number of the through holes 5 can be determined according to the specific construction condition and the size of the valve core 42. The diameter of the through hole 5 is phi 12, the through hole 5 penetrates through the valve core 42 along the length direction of the shell 41, the blind hole 6 is located at the position of the center line of the length direction of the shell 41, and the three through holes 5 are encircled into a circle by taking the blind hole 6 as the center of a circle, namely, the blind hole 6 is distributed at the angle of the center of the circle such as the center of the circle. Blind hole 6 initiating terminal and case 42 keep away from drilling depths one side intercommunication, and the terminal communicates with the big steel pipe 3 outside of pipe shed, and blind hole 6 is an L type promptly, and the terminal of blind hole 6 is provided with a plurality ofly, is provided with threely in this embodiment, begins by the initiating terminal, splits at blind hole 6 middle part and forms. The terminal ends of adjacent blind holes 6 are equidistantly distributed along the circumferential outer wall of the housing 41.
The through holes 5 are internally provided with three primary grouting pipes 1 in a penetrating manner, namely the primary grouting pipes 1. The blind hole 6 department is connected with secondary slip casting pipe 2, has seted up the screw thread on the 6 initiating terminal inner walls of blind hole, and the 2 tip of secondary slip casting pipe and the 6 initiating terminal threaded connection of blind hole. The valve body with the primary grouting pipe 1 and the secondary grouting pipe 2 is in threaded connection with the pipe shed large steel pipe 3 to form an integral structure and is pressed into a drill hole.
S3: the whole structure is subjected to full-length primary grouting through the primary grouting pipes 1, and after the primary grouting is finished, all three primary grouting pipes 1 can be uniformly pulled out, or 1 primary grouting pipe 1 can be pulled out, or 2 primary grouting pipes 1 can be pulled out. The inside of the whole structure is filled with grout by one-time grouting, and meanwhile, the grout permeates into surrounding rocks through holes (not shown) of the large steel pipes 3 of the pipe shed.
S4: after the initial setting and before the final setting of cement mortar, the whole structure is subjected to splitting pressure secondary grouting through a secondary grouting pipe 2, and grout is injected into surrounding rocks through the splitting pressure of a blind hole 6. After the secondary grouting is finished, the secondary grouting pipe 2 can be drawn out or not drawn out.
Referring to fig. 1 and 4, a sunken groove 61 is formed in the outer wall of the housing 41, the sunken groove 61 is located at a position where the blind hole 6 penetrates through the housing 41, the sunken groove 61 takes the end of the blind hole 6 as a circle center and has a diameter larger than the end diameter of the blind hole 6, a waterproof pad or other parts with a waterproof function are placed in the sunken groove 61, after primary grouting, a gap between the outer wall of the large steel pipe 3 of the pipe shed and the inner wall of the drilled hole is filled with slurry, and the waterproof pad is used for blocking the slurry in the gap to the outside, so that the smoothness in the blind hole 6 is ensured, and secondary grouting is facilitated.
Wherein, the outer diameter of the primary grouting pipe 1 is 25mm thin-wall steel pipe, and the outer diameter of the secondary grouting pipe 2 is 20mm thin-wall steel pipe.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A construction method for secondary grouting of a tunnel advanced large pipe shed is characterized by comprising the following steps: the method comprises the following steps:
s1: drilling the drilled hole before grouting is finished;
s2: connecting a grouting valve (4) for secondary pressure grouting on the large steel pipe (3) of the pipe shed to form an integral structure, penetrating a primary grouting pipe (1) and a secondary grouting pipe (2) into the integral structure, penetrating the secondary grouting pipe (2) into the grouting valve (4), communicating the grouting valve (4) with the outside of the large steel pipe (3) of the pipe shed, and then driving the integral structure into a drill hole;
s3: primary grouting is carried out on the whole structure through a primary grouting pipe (1);
s4: and after the initial setting and before the final setting of the cement mortar, carrying out secondary grouting on the whole structure through a secondary grouting pipe (2).
2. The construction method for secondary grouting of the large pipe shed in the advancing process of the tunnel according to claim 1, characterized in that: slip casting valve (4) are including shell (41) and case (42), case (42) are fixed inside shell (41), shell (41) are cylindricly, shell (41) one end is connected with big steel pipe of pipe shed (3), through-hole (5) and blind hole (6) have been seted up on case (42), case (42) are run through along shell (41) length direction in through-hole (5), blind hole (6) one end is kept away from drilling depths one side intercommunication with case (42), the other end communicates with the outside of the big steel pipe of pipe shed (3), secondary slip casting pipe (2) stretch into to blind hole (6) department.
3. The construction method for secondary grouting of the large pipe shed in the advancing process of the tunnel according to claim 2, characterized in that: the blind holes (6) are located at the center line of the large steel pipe (3) of the pipe shed, the through holes (5) are formed in a plurality, and all the through holes (5) are formed in a circular mode at equal central angles by taking the blind holes (6) as centers.
4. The construction method for secondary grouting of the large pipe shed in the advancing process of the tunnel according to claim 2, characterized in that: the shell (41) and the valve core (42) are integrally formed, the shell (41) is made of a steel pipe with the diameter phi of 108, and the diameter of the through hole (5) is phi 12.
5. The construction method for secondary grouting of the large pipe shed in the advancing process of the tunnel according to claim 2, characterized in that: the inner wall of the blind hole (6) is provided with threads, and the secondary grouting pipe (2) is in threaded connection with the blind hole (6).
6. The construction method for secondary grouting of the large pipe shed in the advancing process of the tunnel according to claim 3, characterized in that: the primary grouting pipe (1) is pulled out at a constant speed or is left in the large steel pipe (3) of the pipe shed after grouting.
7. The construction method for secondary grouting of the large pipe shed in the advancing process of the tunnel according to claim 1, characterized in that: after the secondary grouting is finished, the secondary grouting pipe (2) is pulled out or left in the large steel pipe (3) of the pipe shed.
8. The construction method for secondary grouting of the large pipe shed in the advancing process of the tunnel according to claim 2, characterized in that: the blind holes (6) penetrate through the large steel pipes (3) of the pipe shed and are communicated with the outside, and a plurality of blind holes are arranged along the circumferential outer wall of the shell (41) at equal intervals.
9. The construction method for secondary grouting of the large pipe shed in the advancing process of the tunnel according to claim 8, characterized in that: the outer shell (41) is provided with an undercut groove (61), the undercut groove (61) is located at the position where the blind hole (6) penetrates through the large steel pipe (3) of the pipe shed, the circle center of the undercut groove (61) coincides with the circle center of the position where the blind hole (6) penetrates through the large steel pipe (3) of the pipe shed, and the diameter of the undercut groove (61) is larger than that of the blind hole (6).
10. The construction method for secondary grouting of the large pipe shed in the advancing process of the tunnel according to claim 1, characterized in that: the outer diameter of the primary grouting pipe (1) is a thin-wall steel pipe with the diameter of 25 mm; the secondary grouting pipe (2) is a thin-wall steel pipe with the outer diameter of 20 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110559207.2A CN113217026A (en) | 2021-05-21 | 2021-05-21 | Construction method for secondary grouting of tunnel leading large pipe shed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110559207.2A CN113217026A (en) | 2021-05-21 | 2021-05-21 | Construction method for secondary grouting of tunnel leading large pipe shed |
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| CN113217026A true CN113217026A (en) | 2021-08-06 |
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| CN202110559207.2A Pending CN113217026A (en) | 2021-05-21 | 2021-05-21 | Construction method for secondary grouting of tunnel leading large pipe shed |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070105419A (en) * | 2006-04-26 | 2007-10-31 | 명보산업개발 주식회사 | Innovation one shot grouting prefabricated steel pipe installation and using reinforcing tunnelling method |
| KR100852724B1 (en) * | 2008-02-05 | 2008-08-19 | (주)지중공영 | Supporting tube assembly for tunnel grouting including plastic extension tube with cutting grooove and friction resistance enriched surface and tunnel supporting method of using thereof |
| CN101294385A (en) * | 2007-05-30 | 2008-10-29 | 北京科技大学 | Pressure casting non-sand concrete pile |
| KR101076714B1 (en) * | 2011-03-18 | 2011-10-26 | 주식회사 성우사면 | Grouting construction apparatus and method the same |
| CN108952765A (en) * | 2018-07-18 | 2018-12-07 | 中铁十二局集团第二工程有限公司 | Construction method of the super steel tube shed in water-rich sand layer advance support |
| KR102079076B1 (en) * | 2019-08-16 | 2020-02-19 | 이광영 | Reinforced steel pipe one shot grouting and drilling |
| CN111074886A (en) * | 2019-12-18 | 2020-04-28 | 瑞腾基础工程技术（北京）股份有限公司 | Anchor rod device for tertiary grouting |
-
2021
- 2021-05-21 CN CN202110559207.2A patent/CN113217026A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070105419A (en) * | 2006-04-26 | 2007-10-31 | 명보산업개발 주식회사 | Innovation one shot grouting prefabricated steel pipe installation and using reinforcing tunnelling method |
| CN101294385A (en) * | 2007-05-30 | 2008-10-29 | 北京科技大学 | Pressure casting non-sand concrete pile |
| KR100852724B1 (en) * | 2008-02-05 | 2008-08-19 | (주)지중공영 | Supporting tube assembly for tunnel grouting including plastic extension tube with cutting grooove and friction resistance enriched surface and tunnel supporting method of using thereof |
| KR101076714B1 (en) * | 2011-03-18 | 2011-10-26 | 주식회사 성우사면 | Grouting construction apparatus and method the same |
| CN108952765A (en) * | 2018-07-18 | 2018-12-07 | 中铁十二局集团第二工程有限公司 | Construction method of the super steel tube shed in water-rich sand layer advance support |
| KR102079076B1 (en) * | 2019-08-16 | 2020-02-19 | 이광영 | Reinforced steel pipe one shot grouting and drilling |
| CN111074886A (en) * | 2019-12-18 | 2020-04-28 | 瑞腾基础工程技术（北京）股份有限公司 | Anchor rod device for tertiary grouting |
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| Title |
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