CN112065452A - Pressure-bearing stratum lining wall post-grouting head and grouting method - Google Patents
Pressure-bearing stratum lining wall post-grouting head and grouting method Download PDFInfo
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- CN112065452A CN112065452A CN202010975071.9A CN202010975071A CN112065452A CN 112065452 A CN112065452 A CN 112065452A CN 202010975071 A CN202010975071 A CN 202010975071A CN 112065452 A CN112065452 A CN 112065452A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
The invention relates to the technical field of underground cavern construction, and discloses a pressure-bearing stratum lining wall post-grouting head and a grouting method, wherein the pressure-bearing stratum lining wall post-grouting head comprises a straight pipe, an anti-falling limit ring, a water-swelling water-stop sleeve, a barb-free expansion pipe and a fastening nut are sequentially sleeved outside the straight pipe from the front end, and one end of the straight pipe, which is far away from the anti-falling limit ring, is connected with a water-isolating valve; during grouting, a pressure-bearing stratum lining wall post-grouting head is anchored on a lining, then the lining is drilled through from the pressure-bearing stratum lining wall post-grouting head, if water gushing and sand gushing occur, the water gushing and sand gushing can be isolated only by closing a water isolation valve, then grouting can be performed only by connecting a grouting pipeline and opening the water isolation valve, the whole grouting process is simple and safe to operate, and the grouting head can be pulled out and reused after grouting is completed; according to the invention, when the barb-free expansion pipe expands, the water-swelling water stop sleeve is compressed and tightly attached to the hole wall, so that anchoring is firmer and the water-resisting effect is better.
Description
Technical Field
The invention relates to the technical field of underground cavern construction, in particular to a pressure-bearing stratum lining wall post-grouting head and a grouting method.
Background
The village merging town is implemented on a large scale, more and more people live in cities, and the demand for underground facilities such as subways is higher and higher, so more and more underground cavern construction projects are implemented, but the technical levels of construction units in various places are different, not all underground caverns are subjected to sufficient waterproof treatment, a part of newly-owned underground caverns face water leakage diseases, such as one subway line in Zhengzhou city and one station, and the water seepage phenomenon occurs only in six months after the opening.
In the current treatment measures, grouting and water plugging are carried out at the back of the lining, which is the best treatment method. A grouting hole with threads is reserved in a shield tunnel, and grouting at the back of a duct piece can realize safe wall post-grouting through prefabricating a grouting head matched with the duct piece, so that dangerous conditions such as water burst, sand burst and the like can not occur; however, in other types of concrete lining structures such as single-layer lining and composite lining, back grouting is generally realized by drilling holes on site and installing grouting pipes on site, and in the process, if the water body behind the lining is confined water or non-confined water with a higher water head, the phenomenon of gushing is very easy to occur, the gushing has the characteristics of large water quantity, high flow speed, great harm and the like, once the phenomenon of gushing occurs, the water body of the jet flow greatly harms facility safety, track safety and personnel safety in a tunnel room on the one hand, and on the other hand, the temporary plugging difficulty on site is high, the effect is poor, the reliability is low, and great threat is brought to safe operation.
The ball valve is the valve with the best sealing effect, can bear extremely large pressure without leakage, and has the advantages of simple structure, extremely high reliability and difficult failure.
Disclosure of Invention
The invention provides a pressure-bearing stratum lining wall post-grouting head and a grouting method.
The technical problem to be solved is that: when the pressure-bearing stratum is subjected to lining wall post-grouting, dangerous conditions such as water gushing, sand gushing and the like are easily caused by drilling on the lining on site.
In order to solve the technical problems, the invention adopts the following technical scheme: a pressure-bearing stratum lining post-grouting head comprises a straight pipe and a sealing structure sleeved outside the straight pipe, wherein the straight pipe is anchored in a blind hole in a lining back soil surface, the rear end of the straight pipe is arranged outside the blind hole, and the outer side surface of the straight pipe is tightly attached to the wall of the blind hole through the sealing structure;
the rear end of the straight pipe is connected with a water isolating valve, a flow passage allowing the straight rod to pass through is arranged from the inlet to the outlet of the water isolating valve in an opening state, and the flow passage and the straight pipe are coaxially arranged.
Further, seal structure include with straight tube sliding connection's water inflation stagnant water sleeve pipe, the anticreep of anchor on the straight tube go out the spacing circle and with straight tube threaded connection's fastening nut, water inflation stagnant water sleeve pipe sets up between anticreep play spacing circle and fastening nut.
Furthermore, an anti-falling limiting ring, a water-swelling water-stop sleeve, an agnail-free swelling pipe for anchoring the straight pipe in the blind hole and a fastening nut are coaxially sleeved outside the straight pipe from the front end in sequence; an expansion sleeve for expanding the barb-free expansion pipe is also arranged between the barb-free expansion pipe and the water-swelling water-stop sleeve; the barb-free expansion pipe is connected with the straight pipe in a sliding manner, and the expansion sleeve is sleeved on the straight pipe and is connected with the straight pipe in a sliding manner; the barb-free expansion pipe is characterized in that the end with the notch is far away from the fastening nut, one end of the expansion sleeve is inserted into the end with the notch of the barb-free expansion pipe, and the outer diameter of the expansion sleeve is gradually increased from the end inserted into the barb-free expansion pipe to the other end of the expansion sleeve.
Furthermore, a plurality of water-swelling water-stopping sleeves are arranged on the straight pipe, and the water-swelling water-stopping sleeves are connected with the straight pipe in a sliding manner; a movable separation ring is arranged between two adjacent water-swelling water-stop sleeves, and the movable separation ring is sleeved on the straight pipe and is in sliding connection with the straight pipe.
Furthermore, the non-notch end of the barb-free expansion pipe is inserted into the fastening nut and is rotationally connected with the fastening nut; the no incision end opening outside of no barb expansion pipe is provided with inlays the rib of establishing in the recess of fastening nut inner wall, being used for preventing that no barb expansion pipe from droing in the fastening nut.
Further, the water isolating valve is a ball valve and is in threaded connection with the straight pipe.
Further, the notched end side hoop of the barb-free expansion pipe is provided with a rubber ring for tightly combining the barb-free expansion pipe with the insertion position.
Further, the outer diameter of the anti-falling limiting ring is gradually increased from the front end of the straight pipe to the back.
A pressure-bearing stratum lining wall post-grouting method comprises the following steps: the pressure-bearing stratum lining wall post-grouting method uses the pressure-bearing stratum lining wall post-grouting head and comprises the following steps:
step 1: drilling a blind hole capable of being inserted into the pressure-bearing stratum lining wall post-grouting head on the lining;
step 2: inserting a pressure-bearing stratum lining wall post-grouting head into the blind hole and anchoring, and enabling the sealing structure to be tightly attached to the wall of the blind hole;
and step 3: completely opening the water isolation valve, inserting a drill bit into the pressure-bearing stratum lining wall post-grouting head, drilling a blind hole into a through hole, quickly pulling out the drill bit after the lining is drilled through, and closing the water isolation valve;
and 4, step 4: connecting a grouting pipeline and a water isolating valve, and opening the water isolating valve for grouting;
and 5: closing the water isolating valve, and disconnecting the grouting pipeline from the water isolating valve;
step 6: and after the slurry is solidified, pulling out the pressure-bearing stratum lining wall post-grouting head, and plugging the through hole in the lining.
Further, the step 3 is divided into the following sub-steps:
step 3.1: completely opening the water-isolating valve to make the hole of the closing member in the water-isolating valve aligned with the inlet and the outlet of the water-isolating valve;
step 3.2: inserting a hose for preventing a drill bit from scratching the lining wall post-grouting head of the pressure-bearing stratum into the lining wall post-grouting head of the pressure-bearing stratum;
step 3.3: and inserting a drill bit into the hose, quickly pulling out the drill bit and the hose after the drill bit penetrates through the lining wall, and closing the water-isolating valve.
Compared with the prior art, the pressure-bearing stratum lining wall post-grouting head and the grouting method have the following beneficial effects:
according to the invention, the pressure-bearing stratum lining wall post-grouting head is provided with the water-isolating valve, the pressure-bearing stratum lining wall post-grouting head is anchored on the lining, then the lining is drilled through from the pressure-bearing stratum lining wall post-grouting head, if the water burst and sand burst phenomenon occurs, the water burst and sand burst can be isolated only by closing the water-isolating valve, then the grouting can be carried out only by connecting a grouting pipeline and opening the water-isolating valve, and the whole grouting process is simple and safe in operation;
in the invention, the pressure-bearing stratum lining wall post-grouting head is anchored on the lining through the barb-free expansion pipe and can be pulled out and reused after grouting;
according to the invention, the water-swelling water-stop sleeve is sleeved on the straight pipe, and the water-swelling water-stop sleeve is compressed and tightly attached to the hole wall while the barb-free swelling pipe is swelled, so that the anchoring strength is strengthened, and the water seepage phenomenon is effectively avoided.
Drawings
FIG. 1 is a schematic structural diagram of a lining wall post-grouting head of a pressure-bearing stratum according to the invention;
FIG. 2 is a schematic view of a straight pipe;
FIG. 3 is a schematic view of the connection of a fastening nut to an unbarbed expansion tube;
the water-stop expansion joint comprises a straight pipe 1, an anti-falling limiting ring 11, a movable separating ring 12, an expansion sleeve 13, a water-expansion water-stop sleeve 2, an expansion pipe 3 without barbs, a rubber ring 31, an auxiliary dismounting nut 32, a fastening nut 4 and a water-stop valve 5.
Detailed Description
As shown in fig. 1, a pressure-bearing stratum lining wall post-grouting head comprises a straight pipe 1, wherein an anti-falling limit ring 11, a water-swelling water-stop sleeve 2, a barb-free expansion pipe 3 and a fastening nut 4 are coaxially sleeved outside the straight pipe 1 in sequence from one end, and one end of the straight pipe 1, which is far away from the anti-falling limit ring 11, is connected with a water-isolating valve 5;
here meet water inflation stagnant water sleeve pipe 2 promptly and meet water inflation sealing rod sleeve pipe that the material is the same, the effect is that prevent water from oozing between pressure-bearing stratum lining wall post-grouting head and the pore wall, and no barb expansion pipe 3 effect is with pressure-bearing stratum lining wall post-grouting head anchor on the lining, pays attention to the expansion pipe of chooseing for use area barb for the purpose of avoiding influencing the dismantlement.
The anti-falling limiting ring 11 is fixedly connected with the straight pipe 1;
the barb-free expansion pipe 3 is connected with the straight pipe 1 in a sliding manner, and the notched end of the barb-free expansion pipe 3 is far away from the fastening nut 4;
the fastening nut 4 is connected with the straight pipe 1 in a threaded manner, and the relationship between the lead angle and the friction angle of the threads is required to be adjusted, so that the straight pipe 1 does not rotate along with the fastening nut 4 when the fastening nut 4 rotates, and a positioning nut which is convenient to fix by a spanner and limits the rotation of the straight pipe 1 can be welded on the straight pipe 1.
The water isolating valve 5 is provided with a flow passage allowing the straight rod to pass through from the inlet to the outlet in an opening state; the flow channel is arranged coaxially with the straight pipe 1. Since it is necessary to insert a drill bit from the water shut-off valve 5 and the straight pipe 1 to drill through the lining, it is necessary to have a flow passage for the straight rod to pass through from the inlet to the outlet of the water shut-off valve 5 in the open state. In common valves, a butterfly valve cannot be used because a shaft of a closing part blocks a rotating head, and a flow passage of a stop valve is not straight at all and cannot be used. The gate valve and the ball valve meet the requirements, wherein the gate valve is poor in sealing effect and easy to open, the ball valve is good in sealing effect and needs large force to open and close, so that the gate valve or the ball valve can be selected as the water isolating valve 5 during construction in a shallow stratum, and the ball valve is required to be selected when the water isolating valve is used in a deep stratum; the water-stop valve 5 is here screwed to the straight tube 1.
An expansion sleeve 13 used for expanding the barb-free expansion pipe 3 is arranged between the barb-free expansion pipe 3 and the water-swelling water-stop sleeve 2, the expansion sleeve 13 is sleeved on the straight pipe 1, one end of the expansion sleeve is inserted into the barb-free expansion pipe 3, and the outer diameter of the expansion sleeve is gradually increased from the end inserted into the barb-free expansion pipe 3 to the other end of the expansion sleeve. Note that the expansion mode of the unbarbed expansion pipe 3 is slightly different from that of a conventional expansion bolt, the expansion pipe is not moved in the expansion bolt, and the expansion pipe is pulled out by a screw rod in the expansion bolt, but in this embodiment, the unbarbed expansion pipe 3 is pushed inward by the fastening nut 4 and pushed open by the expansion sleeve 13.
The straight pipe 1 is provided with a plurality of water-swelling water-stopping sleeves 2, and the water-swelling water-stopping sleeves 2 are connected with the straight pipe 1 in a sliding manner; as shown in fig. 1-2, a movable separation ring 12 is arranged between two adjacent water-swelling water-stop sleeves 2, and the movable separation ring 12 is sleeved on the straight pipe 1 and is connected with the straight pipe 1 in a sliding manner; the expansion sleeve 13 is connected with the straight pipe 1 in a sliding way. The expansion sleeve 13 and the straight tube 1 are connected in a sliding mode, the expansion sleeve can move along with the insertion of the barb-free expansion tube 3, the water-swelling and water-stopping sleeve 2 is compressed, the expansion sleeve is tightly attached to the hole wall, the anchoring effect is enhanced, the anti-leakage effect is enhanced, meanwhile, the expansion sleeve can be loosened along with the extraction of the barb-free expansion tube 3 during the disassembly, the water-swelling and water-stopping sleeve 2 is prevented from being tightly attached to the hole wall after absorbing water and is difficult to extract, the single water-swelling and water-stopping sleeve 2 is shortened in the purpose of arranging the water-swelling and water-stopping sleeves 2, the water-swelling and water-stopping sleeve 2 is prevented from being uneven in all places when being compressed due to.
As shown in fig. 3, the non-notched end of the barb-free expansion pipe 3 is inserted into the fastening nut 4 and is rotatably connected with the fastening nut 4; the outside of the non-incision end opening of the barb-free expansion pipe 3 is provided with a rib which is embedded in the groove on the inner wall of the fastening nut 4 and is used for preventing the barb-free expansion pipe 3 from falling off from the fastening nut 4. The ribs are arranged for safety, the fastening nut 4 belongs to a fastening piece used in a limited space, direct manual operation is needed in many places, and in engineering practice, the gap between the fastening nut 4 and the barb-free expansion pipe 3 is often clamped by hands of workers, and the two are integrated, so that accidents can be avoided.
The notched end side hoop of the unbarbed expanded pipe 3 is provided with a rubber ring 31 for making the unbarbed expanded pipe 3 be more tightly coupled with the insertion site.
The external diameter of the anti-falling limiting ring 11 is gradually increased from the front end of the straight pipe 1 to the rear grouting head of the whole pressure-bearing stratum lining wall is inserted into the blind hole.
The no barb expansion pipe 3 goes up the cover and is equipped with the assistance of no barb expansion pipe 3 fixed connection and tear nut 32 open to clip with the pliers when dismantling, wave, conveniently extract.
Note that, in the parts of the straight pipe 1, except the barb-free expansion pipe 3 and the auxiliary dismounting nut 32 which are fixedly connected with each other, the barb-free expansion pipe 3 and the fastening nut 4 which are rotatably connected with each other are all arranged in a contact manner between the other adjacent parts.
The concrete method for grouting by using the pressure-bearing stratum lining wall post-grouting head comprises the following steps:
step 1: drilling a blind hole with the inner diameter not smaller than the outer diameter of the water-swelling water stop sleeve 2 and the outer diameter of the barb-free swelling pipe 3 on the lining, and paying attention to the fact that the residual lining in the blind hole can bear the pressure after lining the wall during installation of the pressure-bearing stratum lining post-grouting head;
step 2: inserting a pressure-bearing stratum lining wall post-grouting head into the blind hole, screwing the fastening nut 4, expanding and clamping the barb-free expansion pipe 3 on the hole wall, and simultaneously compressing the water-swelling water-stop sleeve 2 to enable the water-swelling water-stop sleeve to be tightly attached to the hole wall;
and step 3: completely opening the water isolation valve 5, inserting a drill bit into the pressure-bearing stratum lining wall post-grouting head, quickly pulling out the drill bit after the lining wall is drilled through, and closing the water isolation valve 5;
and 4, step 4: connecting the grouting pipeline with the water isolating valve 5, and opening the water isolating valve 5 for grouting;
and 5: closing the water isolating valve 5, and disconnecting the connection between the grouting pipeline and the water isolating valve 5;
step 6: and (4) loosening the fastening nut 4 after the grout is solidified, pulling out the pressure-bearing stratum lining wall post-grouting head, and plugging the drilled hole.
step 3.1: fully opening the water isolating valve 5 to align the holes of the closing member in the water isolating valve 5 with the inlet and outlet of the water isolating valve 5;
step 3.2: inserting a hose for preventing a drill bit from scratching the lining wall post-grouting head of the pressure-bearing stratum into the lining wall post-grouting head of the pressure-bearing stratum; because the drill bit shakes during punching, the post-grouting head of the lining wall of the pressure-bearing stratum can be scratched;
step 3.3: the drill bit is inserted into the hose, and after the lining wall is drilled through, the drill bit and the hose are rapidly pulled out, and the water-isolating valve 5 is closed.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention, including the application of the present invention in pure liquid, made by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. The utility model provides a pressure-bearing stratum lining wall post-grouting head which characterized in that: the lining soil back surface sealing structure comprises a straight pipe (1) and a sealing structure sleeved outside the straight pipe (1), wherein the straight pipe (1) is anchored in a blind hole of a lining soil back surface, the rear end of the straight pipe (1) is arranged outside the blind hole, and the outer side surface of the straight pipe (1) is tightly attached to the wall of the blind hole through the sealing structure;
the rear end of the straight pipe (1) is connected with a water isolating valve (5), a flow passage allowing the straight rod to pass through is formed in the water isolating valve (5) from an inlet to an outlet in an opening state, and the flow passage and the straight pipe (1) are coaxially arranged.
2. The confined formation lining backfill grouting head of claim 1, wherein: seal structure include with straight tube (1) sliding connection's water inflation stagnant water sleeve pipe (2), the anticreep of anchor on straight tube (1) goes out spacing circle (11) and with straight tube (1) threaded connection's fastening nut (4), water inflation stagnant water sleeve pipe (2) set up between anticreep play spacing circle (11) and fastening nut (4).
3. The confined formation lining backfill grouting head of claim 2, wherein: the anti-falling limiting ring (11), the water-swelling water-stop sleeve (2), the barb-free swelling pipe (3) for anchoring the straight pipe (1) in the blind hole and the fastening nut (4) are sequentially and coaxially sleeved outside the straight pipe (1) from the front end; an expansion sleeve (13) for expanding the barb-free expansion pipe (3) is also arranged between the barb-free expansion pipe (3) and the water-swelling water-stop sleeve (2); the barb-free expansion pipe (3) is connected with the straight pipe (1) in a sliding manner, and the expansion sleeve (13) is sleeved on the straight pipe (1) and is connected with the straight pipe (1) in a sliding manner; the non-barb expansion pipe (3) have the incision end to keep away from fastening nut (4) setting, expand sleeve pipe (13) one end and insert and establish in the incision end that has of non-barb expansion pipe (3), and the external diameter is from inserting the one end of establishing in non-barb expansion pipe (3) to the other end crescent.
4. The confined formation lining backfill grouting head of claim 3, wherein: the straight pipe (1) is provided with a plurality of water-swelling water-stopping sleeves (2), and the water-swelling water-stopping sleeves (2) are connected with the straight pipe (1) in a sliding manner; a movable separation ring (12) is arranged between two adjacent water-swelling water-stop sleeves (2), and the movable separation ring (12) is sleeved on the straight pipe (1) and is in sliding connection with the straight pipe (1).
5. The confined formation lining backfill grouting head of claim 3, wherein: the non-notch end of the barb-free expansion pipe (3) is inserted into the fastening nut (4) and is rotationally connected with the fastening nut (4); the outer side of the opening of the non-incision end of the barb-free expansion pipe (3) is provided with a rib which is embedded in the groove of the inner wall of the fastening nut (4) and used for preventing the barb-free expansion pipe (3) from falling off from the fastening nut (4).
6. The confined formation lining backfill grouting head of claim 1, wherein: the water isolating valve (5) is a ball valve and is in threaded connection with the straight pipe (1).
7. The confined formation lining backfill grouting head of claim 3, wherein: the side hoop of the cut end of the barb-free expansion pipe (3) is provided with a rubber ring (31) which is used for enabling the barb-free expansion pipe (3) to be combined with an insertion position more tightly.
8. The confined formation lining backfill grouting head of claim 2, wherein: the outer diameter of the anti-falling limiting ring (11) is gradually increased from the front end of the straight pipe (1) to the back.
9. A pressure-bearing stratum lining wall post-grouting method comprises the following steps: the method is characterized in that: the confined formation lining backfill grouting method uses the confined formation lining backfill grouting head according to any one of claims 1-8, and comprises the following steps:
step 1: drilling a blind hole capable of being inserted into the pressure-bearing stratum lining wall post-grouting head on the lining;
step 2: inserting a pressure-bearing stratum lining wall post-grouting head into the blind hole and anchoring, and enabling the sealing structure to be tightly attached to the wall of the blind hole;
and step 3: completely opening the water isolation valve (5), inserting a drill bit into the pressure-bearing stratum lining wall post-grouting head, drilling a blind hole into a through hole, quickly pulling out the drill bit after the lining is drilled through, and closing the water isolation valve (5);
and 4, step 4: connecting the grouting pipeline with the water isolating valve (5), and opening the water isolating valve (5) for grouting;
and 5: closing the water isolating valve (5), and disconnecting the grouting pipeline from the water isolating valve (5);
step 6: and after the slurry is solidified, pulling out the pressure-bearing stratum lining wall post-grouting head, and plugging the through hole in the lining.
10. The confined formation lining wall post-grouting method according to claim 9, characterized in that: step 3 comprises the following sub-steps:
step 3.1: fully opening the water isolating valve (5) to align the hole of the closing member in the water isolating valve (5) with the inlet and the outlet of the water isolating valve (5);
step 3.2: inserting a hose for preventing a drill bit from scratching the lining wall post-grouting head of the pressure-bearing stratum into the lining wall post-grouting head of the pressure-bearing stratum;
step 3.3: and inserting a drill bit into the hose, quickly pulling out the drill bit and the hose after the drill bit penetrates through the lining wall, and closing the water-isolating valve (5).
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| CN209637774U (en) * | 2019-02-22 | 2019-11-15 | 中铁十一局集团城市轨道工程有限公司 | A kind of duct pieces of shield tunnel grouting device |
| CN111396090A (en) * | 2020-04-24 | 2020-07-10 | 中国铁建重工集团股份有限公司 | Grouting joint for construction of double-shield TBM |
| CN212958660U (en) * | 2020-09-16 | 2021-04-13 | 北京市政路桥科技发展有限公司 | Pressure-bearing stratum lining wall post-grouting head capable of preventing gushing |
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| CN112065452B (en) | 2022-08-02 |
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