CN110593894A - Novel shield tunnel concrete pipe piece miniature reinforcing pile - Google Patents
Novel shield tunnel concrete pipe piece miniature reinforcing pile Download PDFInfo
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- CN110593894A CN110593894A CN201910872179.2A CN201910872179A CN110593894A CN 110593894 A CN110593894 A CN 110593894A CN 201910872179 A CN201910872179 A CN 201910872179A CN 110593894 A CN110593894 A CN 110593894A
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 239000002002 slurry Substances 0.000 claims description 16
- 239000004568 cement Substances 0.000 claims description 14
- 238000013461 design Methods 0.000 claims description 12
- 239000011440 grout Substances 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 9
- 239000004575 stone Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000004080 punching Methods 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 4
- 238000007569 slipcasting Methods 0.000 claims description 4
- 230000001680 brushing effect Effects 0.000 claims description 3
- 230000005574 cross-species transmission Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000011241 protective layer Substances 0.000 claims description 3
- 239000002689 soil Substances 0.000 abstract description 17
- 238000010276 construction Methods 0.000 abstract description 9
- 230000005641 tunneling Effects 0.000 abstract description 9
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
- E21D11/08—Lining with building materials with preformed concrete slabs
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- 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
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- 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
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- 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
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- 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
- E21D21/0066—Anchoring-bolts formed by a bundle of radially arranged rigid elements
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- 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)
- Architecture (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to the technical field of civil engineering tunnel shield construction equipment, and discloses a novel micro reinforcing pile for a shield tunnel concrete pipe, which comprises a reinforcing pile main body, wherein a pile body grouting opening is formed in the outer part of the reinforcing pile main body, a cover plate is fixedly connected to the left side of the reinforcing pile main body, a cover body grouting opening is formed in the cover plate, a pipe wall connecting bolt is fixedly connected to the left side of the cover plate, and a core rod is fixedly connected to the inner part of the reinforcing pile main body. The novel miniature reinforcing pile for the concrete pipe sheet of the shield tunnel can effectively improve the mechanical property of the soil body around the tunnel by using the method and the device, the grouting enables the pile to form a whole body, the load bearing capacity is improved, the integrity of the lining and the soil body is greatly increased, and the stress range of the reinforcing pile main body is enlarged, so that the overlarge settlement deformation is effectively avoided, the potential safety hazard of tunnel shield tunneling is eliminated to a great extent, and the shield method can be used more safely.
Description
Technical Field
The invention relates to the technical field of civil engineering tunnel shield construction equipment, in particular to a novel micro reinforcing pile for a shield tunnel concrete pipe sheet.
Background
The tunnel construction is a new engineering construction method formed by adopting a system formed by adopting a spray anchor technology, monitoring measurement and the like and a rock mechanics theory.
At present, with the rapid development of traffic roads in China, various mountain expressway and city subway construction are carried out, the process of tunnel construction is gradually mature, particularly shield construction, the tunnel construction method has the advantages of safety, rapidness, high mechanization degree and the like, however, when shield tunneling is used in a soil stratum, the settlement of soil around a tunnel is often not well controlled, the settlement control requirement of tunnel construction on soil around a surrounding rock is very high, in the prior art, when shield tunneling is carried out in a tunnel section, if the settlement deformation of the soil around is too large, tunnel collapse and disjointing are easily caused, serious potential safety hazards exist, and therefore the novel micro reinforcing pile for the shield tunnel concrete segment is provided to solve the problems.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a novel micro reinforcing pile for a shield tunnel concrete pipe section, which has the advantages of eliminating the potential safety hazard of tunnel shield tunneling and the like, and solves the problem that when shield tunneling is carried out in a tunnel section, if the settlement deformation of the surrounding soil body is too large, the tunnel is easy to collapse and disjointed, and the potential safety hazard is serious.
(II) technical scheme
In order to realize the purpose of eliminating the potential safety hazard of tunnel shield tunneling, the invention provides the following technical scheme: a novel micro reinforcing pile for a shield tunnel concrete pipe comprises a reinforcing pile main body, wherein a pile body grouting opening is formed in the outer portion of the reinforcing pile main body, a cover plate is fixedly connected to the left side of the reinforcing pile main body, a cover body grouting opening is formed in the cover plate, a pipe wall connecting bolt is fixedly connected to the left side of the cover plate, a core rod is fixedly connected to the inner portion of the reinforcing pile main body, a rod body grouting opening is formed in the outer portion of the core rod, a jacking head is fixedly connected to the right side of the core rod, a spreading wing is hinged to the outer portion of the core rod, a spring is fixedly connected to the outer portion of the core rod, a shield concrete pipe piece is fixedly connected to the outer portion of the reinforcing pile main body, a screw embedded part is fixedly connected to the inner portion of the shield concrete pipe piece and positioned outside the pipe wall connecting bolt, a screw sealing ring is fixedly installed in the screw, and a PVC pipe sleeve is fixedly arranged outside the pipe wall connecting bolt and inside the shield concrete pipe piece.
Preferably, two upper and lower lid body slip casting mouths have been seted up to the inside of apron, the diameter of core rod is 15 mm.
Preferably, the diameter of the reinforcing pile main body is 90mm, the thickness of the reinforcing pile main body is 10mm, pile body grouting openings outside the reinforcing pile main body are distributed in an alternate staggered mode and are distributed on the right side of the reinforcing pile main body, and the length of the pile body grouting openings is 1/2-1/3 of the length of the whole pile body.
Preferably, one end of the spring, which is far away from the core rod, is fixedly connected with unfolding wings, the outer part of the core rod is hinged with eight unfolding wings, and the eight unfolding wings are movably connected with the core rod through the spring.
A novel preparation method of a shield tunnel concrete pipe sheet micro reinforcing pile comprises the following steps:
1) a hole is reserved in the shield pipe piece, and a hole for inserting a reinforcing pile is reserved in a preset position of the prefabricated shield concrete pipe piece;
2) applying a waterproof measure, namely embedding a PVC pipe sleeve at the joint of the opened cavity opening and the shield concrete pipe piece, wherein the PVC pipe sleeve is a threaded sleeve, and laying a waterproof coiled material, applying a protective layer and brushing waterproof paint between the pipe piece preformed hole and the pipe wall of the pile body;
3) forming holes, namely, punching holes at the reserved holes, wherein the punching depth is about 100mm longer than the length of the reinforcing pile, applying slurry to protect the walls and form the holes, then cleaning the holes, and reducing the specific gravity of the slurry in the holes to the range of the design requirement through a slurry circulating system in hole forming equipment;
4) inserting a reinforcing pile main body, inserting the reinforcing pile main body into a hole reserved in the shield concrete pipe piece, clamping the pile tail and the shield concrete pipe piece at a preset position, preliminarily connecting the outer steel wall, positioning by using bolts, and preliminarily fixing;
5) jacking the core rod, using jacking equipment such as a jack to jack the core rod forwards for more than 300mm, and standing for a period of time after the unfolded wing is separated from the pipe wall;
6) fixing the core rod, pulling back the core rod by about 140mm by using an instrument until the core rod cannot move, taking down the preliminarily fixed bolt, covering a pile tail cover plate, laying a bolt washer, completely fixing the external steel wall by using a pipe wall connecting bolt, and fixing the threaded core rod by using a nut;
7) filling small-particle broken stones with the particle sizes meeting the design requirements in the pile holes, wherein the input amount of the broken stones meets the design requirements;
8) the second time of hole cleaning, utilize the high-pressure water injection apparatus to inject high-pressure clear water into the body tube of the reinforced pile, utilize the cover body grouting mouth that the cover plate of the foot portion reserves to insert the slip casting pipe and inject the clear water from the bottom of the pile hole, dilute the mud sand on the broken stone aggregate in the hole and slurry formed in the course of hole forming and spill over from the upper orifice and enter the mud pit, this process is continued until the mud water washed out is turned into the clear water from muddy gradually, said silt on aggregate in the hole and slurry water produced while the hole forming have already basically been cleaned, can stop the injection of the high-pressure clear water;
9) grouting, namely grouting the pile hole by using a grouting pipe in a grouting port of the lower cover body, continuously grouting to ensure that cement grout extrudes clean water among original aggregates until the gray cement grout overflows from a grouting port (14) of the upper cover body, and keeping the continuous grouting for two minutes, wherein at the moment, filling liquid among the aggregates of the pile body is replaced by the cement grout which meets the design requirement by the clean water, and the grouting can be stopped at the moment;
10) sealing and maintaining, sealing the hole opening after stopping grouting, and maintaining for 24-48 hours.
(III) advantageous effects
Compared with the prior art, the invention provides a novel micro reinforcing pile for a shield tunnel concrete pipe sheet, which has the following beneficial effects:
1. the novel micro reinforcing pile for the concrete pipe sheet of the shield tunnel can effectively improve the mechanical property of the soil body around the tunnel by using the method and the device, the grouting enables the soil body to form a whole body, the load bearing capacity is improved, the integrity of a lining and the soil body is greatly increased, the stress range of the main body of the reinforcing pile is enlarged, thereby effectively avoiding overlarge settlement deformation, eliminating the potential safety hazard of tunnel shield tunneling to a great extent, enabling the shield tunneling method to be used more safely, the lower half part of the main body of the reinforcing pile is provided with a rod body grouting opening, along with continuous grouting under preset grouting pressure, redundant grout can permeate into the soil layer through the rod body grouting opening and is cemented with soil particles to form a whole body, the rod body grouting opening is arranged in a staggered manner, meanwhile, the mechanical gripping force of cement can also be increased, and the mechanical property of the soil body around the tunnel is improved, the pile end cement slurry can wrap the pile end soil body, the cement slurry is gradually distributed along the pile body along with the further continuation of the injection, and the cement slurry can effectively enlarge the diameter of the pile end and the diameter of the pile body related to diffusion distribution, so that the bearing capacity of the reinforced pile is greatly improved.
2. According to the novel micro reinforcing pile for the concrete pipe sheet of the shield tunnel, eight unfolding wings are hinged to the outside of the core rod and are movably connected with the core rod through springs, so that the length of each unfolding wing can be conveniently increased, the stress area of the pile end can be enlarged, and the bearing capacity of the reinforcing pile is improved; meanwhile, due to the extension of the unfolding wings, cement slurry can further permeate outwards along the eight unfolding wings, a glued body which is the same as an umbrella cover can be formed with end soil bodies, the reinforcing piles at the upper part of the tunnel can also play a role of suspending the soil bodies and are similar to the anchoring effect, the anchoring effect of the reinforcing piles is greatly increased, the bearing capacity of the soil bodies is improved, and overlarge settlement deformation in the shield tunneling process is effectively avoided.
Drawings
FIG. 1 is a structural cross-sectional view of a novel micro reinforcing pile for a concrete pipe sheet of a shield tunnel according to the present invention;
FIG. 2 is a right side view of a novel micro reinforcing pile structure for a concrete segment of a shield tunnel according to the present invention;
FIG. 3 is a left side view of a novel micro reinforcing pile structure for a concrete segment of a shield tunnel according to the present invention;
FIG. 4 is a cross-sectional view of a bolt connecting hole and a waterproof structure of a novel micro reinforcing pile for a concrete pipe sheet of a shield tunnel according to the present invention;
fig. 5 is a cross-sectional view of a shield concrete segment connection structure of a novel micro reinforcing pile for a shield tunnel concrete segment according to the present invention.
In the figure: the structure comprises a reinforcing pile body 1, a pile body grouting opening 2, a cover plate 3, a pipe wall connecting bolt 4, a core rod 5, a rod body grouting opening 6, a jacking head 7, an unfolding wing 8, a spring 9, a shield concrete segment 10, a screw sealing ring 11, a PVC pipe sleeve 12, a screw embedded part 13 and a cover body grouting opening 14.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, a novel micro reinforcing pile for concrete pipe of shield tunnel comprises a reinforcing pile body 1, wherein pile body grouting ports 2 are formed on the outer portion of the reinforcing pile body 1, the diameter of the reinforcing pile body 1 is 90mm, the thickness of the reinforcing pile body 1 is 10mm, the pile body grouting ports 2 on the outer portion of the reinforcing pile body 1 are alternately distributed on the right side of the reinforcing pile body 1, the length of the pile body grouting ports is 1/2-1/3 of the length of the whole pile body, a cover plate 3 is fixedly connected to the left side of the reinforcing pile body 1, a cover body grouting port 14 is formed in the cover plate 3, upper and lower cover body grouting ports 14 are formed in the cover plate 3, a pipe wall connecting bolt 4 is fixedly connected to the left side of the cover plate 3, a core rod 5 is fixedly connected to the inner portion of the reinforcing pile body 1, the diameter of the core rod 5 is 15mm, a rod body grouting port 6 is formed on the outer portion of the, core pole 5's right side fixedly connected with top is advanced 7, core pole 5's outside articulates there is the expansion wing 8, core pole 5's outside fixedly connected with spring 9, spring 9 is far away from core pole 5's one end fixedly connected with expansion wing 8, core pole 5's outside articulates there is the expansion wing 8 that quantity is eight, eight expansion wing 8 all are through spring 9 and core pole 5 swing joint, the outside fixedly connected with shield of reinforcement stake main part 1 constructs concrete segment 10, the outside of pipe wall connecting bolt 4 just is located the inside fixedly connected with screw built-in fitting 13 of shield concrete segment 10, the inside fixed mounting of screw built-in fitting 13 has screw seal circle 11, the outside of pipe wall connecting bolt 4 just is located the inside fixed mounting that constructs concrete segment 10 has PVC pipe box 12.
A novel preparation method of a shield tunnel concrete pipe sheet micro reinforcing pile comprises the following steps:
1) a hole is reserved in the shield pipe piece, and a hole for inserting a reinforcing pile is reserved in a preset position of the prefabricated shield concrete pipe piece 10;
2) applying a waterproof measure, namely embedding a PVC pipe sleeve 12 at the joint of the opened cavity and the shield concrete segment 10, wherein the PVC pipe sleeve 12 is a threaded sleeve, and laying a waterproof coiled material, applying a protective layer and brushing waterproof paint between the segment preformed hole and the wall of the pile body;
3) forming holes, namely, punching holes at the reserved holes, wherein the punching depth is about 100mm longer than the length of the reinforcing pile, applying slurry to protect the walls and form the holes, then cleaning the holes, and reducing the specific gravity of the slurry in the holes to the range of the design requirement through a slurry circulating system in hole forming equipment;
4) inserting a reinforcing pile main body 1, inserting the reinforcing pile main body 1 into a hole reserved in a shield concrete segment 10, clamping the pile tail and the shield concrete segment 10 at a preset position, preliminarily connecting an outer steel wall, positioning by using bolts, and preliminarily fixing;
5) jacking the core rod 5, using jacking equipment such as a jack to jack the core rod 5 forward by more than 300mm, and standing for a period of time after the unfolding wings 8 are separated from the pipe wall;
6) fixing the core rod 5, pulling back the core rod 5 by about 140mm by using an instrument until the core rod cannot move, taking down the preliminarily fixed bolt, covering the pile tail cover plate 3, laying a bolt washer, completely fixing the external steel wall by using the pipe wall connecting bolt 4, and fixing the threaded core rod 5 by using a nut;
7) filling small-particle broken stones with the particle sizes meeting the design requirements in the pile holes, wherein the input amount of the broken stones meets the design requirements;
8) the second time of hole cleaning, utilize the high-pressure water injection apparatus to inject the high-pressure clear water into the tube of the reinforcing pile body 1, utilize the cover body grouting port 14 that the tail cover plate 3 reserves to insert the slip casting pipe and inject the clear water from the bottom of the pile hole, dilute the mud sand on the broken stone aggregate and mud formed in the course of forming the hole and spill over from the upper orifice and enter the mud pit, this process is continued until the mud water washed out is turned into the clear water gradually from muddy, said silt on aggregate in the hole and mud water produced in the course of forming the hole in the hole have already basically been cleaned up, can stop the injection of the high-pressure clear water;
9) grouting, namely grouting the pile hole by using a grouting pipe in a grouting port 14 of the lower cover body, continuously grouting to ensure that cement grout extrudes clean water among original aggregates until gray cement grout overflows the grouting port 14 of the upper cover body, and keeping continuous grouting for two minutes, wherein at the moment, filling liquid among the aggregates of the pile body is replaced by the cement grout which meets the design requirement from the clean water, and grouting can be stopped at the moment;
10) sealing and maintaining, sealing the hole opening after stopping grouting, and maintaining for 24-48 hours.
In summary, the novel micro reinforcing pile for the concrete pipe sheet of the shield tunnel,
it is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a novel miniature reinforced pile of shield tunnel concrete section of jurisdiction, includes reinforced pile main part (1), its characterized in that: the reinforcing pile comprises a reinforcing pile main body (1), a pile body grouting opening (2) is formed in the outer portion of the reinforcing pile main body (1), a cover plate (3) is fixedly connected to the left side of the reinforcing pile main body (1), a cover body grouting opening (14) is formed in the cover plate (3), a pipe wall connecting bolt (4) is fixedly connected to the left side of the cover plate (3), a core rod (5) is fixedly connected to the inner portion of the reinforcing pile main body (1), a rod body grouting opening (6) is formed in the outer portion of the core rod (5), a jacking head (7) is fixedly connected to the right side of the core rod (5), an unfolding wing (8) is hinged to the outer portion of the core rod (5), a spring (9) is fixedly connected to the outer portion of the reinforcing pile main body (1), a shield concrete pipe piece (10) is fixedly connected to the outer portion of the pipe wall connecting bolt (4), and an embedded screw piece (13) is fixedly connected to the inner portion of the shield concrete, the novel shield concrete pipe piece is characterized in that a screw sealing ring (11) is fixedly mounted inside the screw embedded part (13), and a PVC pipe sleeve (12) is fixedly mounted outside the pipe wall connecting bolt (4) and inside the shield concrete pipe piece (10).
2. The novel micro reinforcing pile for the shield tunnel concrete pipe section according to claim 1, characterized in that: two upper and lower cover body grouting openings (14) are formed in the cover plate (3), and the diameter of the core rod (5) is 15 mm.
3. The novel micro reinforcing pile for the shield tunnel concrete pipe section according to claim 1, characterized in that: the diameter of the reinforcing pile main body (1) is 90mm, the thickness of the reinforcing pile main body is 10mm, pile body grouting openings (2) outside the reinforcing pile main body (1) are distributed in a staggered mode and are distributed on the right side of the reinforcing pile main body (1), and the length of the pile body grouting openings is 1/2-1/3 of the length of the whole pile body.
4. The novel micro reinforcing pile for the shield tunnel concrete pipe section according to claim 1, characterized in that: one end fixedly connected with that spring (9) is far away from core rod (5) expandes wing (8), the outside of core rod (5) articulates there is expansion wing (8) that quantity is eight expansion wing (8), eight expansion wing (8) all are through spring (9) and core rod (5) swing joint.
5. A novel preparation method of a shield tunnel concrete pipe sheet micro reinforcing pile is characterized by comprising the following steps:
1) a hole is reserved in the shield segment, and a hole for inserting a reinforcing pile is reserved in a preset position of a prefabricated shield concrete segment (10);
2) applying a waterproof measure, namely embedding a PVC pipe sleeve (12) at the joint of the opened cavity and the shield concrete segment (10), wherein the PVC pipe sleeve (12) is a threaded sleeve, and laying a waterproof coiled material, applying a protective layer and brushing waterproof paint between the segment preformed hole and the wall of the pile body;
3) forming holes, namely, punching holes at the reserved holes, wherein the punching depth is about 100mm longer than the length of the reinforcing pile, applying slurry to protect the walls and form the holes, then cleaning the holes, and reducing the specific gravity of the slurry in the holes to the range of the design requirement through a slurry circulating system in hole forming equipment;
4) inserting a reinforcing pile main body (1), inserting the reinforcing pile main body (1) into a hole reserved in a shield concrete segment (10), clamping the pile tail and the shield concrete segment (10) at a preset position, preliminarily linking the outer steel wall, positioning by using bolts, and preliminarily fixing;
5) jacking the core rod (5), jacking the core rod (5) forwards by more than 300mm by using jacking equipment such as a jack, and standing for a period of time after the unfolding wings (8) are separated from the pipe wall;
6) fixing a core rod (5), pulling back the core rod (5) by about 140mm by using an instrument until the core rod cannot move, taking down a preliminarily fixed bolt, covering a pile tail cover plate (3), laying a bolt washer, completely fixing an external steel wall by using a pipe wall connecting bolt (4), and fixing the threaded core rod (5) by using a nut;
7) filling small-particle broken stones with the particle sizes meeting the design requirements in the pile holes, wherein the input amount of the broken stones meets the design requirements;
8) the second time of hole cleaning, utilize the high-pressure water injection equipment to inject the high-pressure clear water into the tube of the reinforced pile body (1), utilize the cover body grouting mouth (14) that the tail cover plate (3) reserves to insert the slip casting pipe and inject the clear water from the bottom of the pile hole, dilute the mud sand on the broken stone aggregate in the hole and slurry formed in the course of forming the hole and spill over from the upper orifice and enter the mud pool side by side, this process is continued until the mud water washed out turns into the clear water from muddy gradually, said mud sand on aggregate in the hole and mud water produced while forming the hole in the hole have been basically cleaned up, can stop the injection of the high-pressure clear water;
9) grouting, namely grouting the pile hole by using a grouting pipe in a grouting port (14) of the lower cover body, continuously grouting to enable cement grout to extrude clean water among original aggregates until gray cement grout overflows from the grouting port (14) of the upper cover body, and keeping continuous grouting for two minutes, wherein at the moment, filling liquid among the aggregates of the pile body is replaced by the cement grout meeting the design requirement from the clean water, and grouting can be stopped at the moment;
10) sealing and maintaining, sealing the hole opening after stopping grouting, and maintaining for 24-48 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910872179.2A CN110593894B (en) | 2019-09-16 | 2019-09-16 | Novel shield tunnel concrete pipe piece miniature reinforcing pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910872179.2A CN110593894B (en) | 2019-09-16 | 2019-09-16 | Novel shield tunnel concrete pipe piece miniature reinforcing pile |
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| Publication Number | Publication Date |
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| CN110593894A true CN110593894A (en) | 2019-12-20 |
| CN110593894B CN110593894B (en) | 2020-12-25 |
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| CN201910872179.2A Active CN110593894B (en) | 2019-09-16 | 2019-09-16 | Novel shield tunnel concrete pipe piece miniature reinforcing pile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113944473A (en) * | 2021-09-26 | 2022-01-18 | 中铁四局集团有限公司 | Rotary spraying construction method for increasing ductility of pile foundation of operation subway station |
| CN114922661A (en) * | 2022-07-21 | 2022-08-19 | 中南大学 | Miniature reinforcing pile for concrete pipe sheet of shield tunnel |
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| DE3707036A1 (en) * | 1987-03-05 | 1988-09-15 | Hausherr & Soehne Rudolf | Fastening system consisting of a drillhole and of a rock tie fastenable in this |
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| CN113944473A (en) * | 2021-09-26 | 2022-01-18 | 中铁四局集团有限公司 | Rotary spraying construction method for increasing ductility of pile foundation of operation subway station |
| CN114922661A (en) * | 2022-07-21 | 2022-08-19 | 中南大学 | Miniature reinforcing pile for concrete pipe sheet of shield tunnel |
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