CN116104535A - Pipe shed advanced support method - Google Patents

Pipe shed advanced support method Download PDF

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Publication number
CN116104535A
CN116104535A CN202211732714.2A CN202211732714A CN116104535A CN 116104535 A CN116104535 A CN 116104535A CN 202211732714 A CN202211732714 A CN 202211732714A CN 116104535 A CN116104535 A CN 116104535A
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CN
China
Prior art keywords
pipe
sleeve
assembly
pipe shed
shed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211732714.2A
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Chinese (zh)
Inventor
赵子龙
周虹
余朝阳
李艳哲
丁路
林细弟
余文志
肖衡林
陈娜
李鑫
方康
吴晓婵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hubei University of Technology
China Railway Major Bridge Engineering Group Co Ltd MBEC
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Hubei University of Technology
China Railway Major Bridge Engineering Group Co Ltd MBEC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Hubei University of Technology, China Railway Major Bridge Engineering Group Co Ltd MBEC filed Critical Hubei University of Technology
Priority to CN202211732714.2A priority Critical patent/CN116104535A/en
Publication of CN116104535A publication Critical patent/CN116104535A/en
Pending legal-status Critical Current

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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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/25—Greenhouse technology, e.g. cooling systems therefor

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Mining & Mineral Resources (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 invention discloses a pipe shed advanced support method, which relates to the technical field of tunnel advanced support construction, and comprises the following steps: drilling to a first depth with a first casing assembly; the first sleeve assembly is reserved, the pipe shed steel flower pipe assembly passes through the first sleeve assembly, and the pipe shed steel flower pipe assembly is used as a second sleeve assembly to be continuously drilled to a second depth; installing a reinforcement cage in the pipe shed steel flower pipe assembly; and after the reinforcement cage is installed, the first sleeve assembly is pulled out. The invention adopts the double-sleeve follow-up drilling method to carry out construction, the sleeves are followed in sections, and the influences of friction resistance and material strength can be overcome through the large sleeve and the small sleeve.

Description

Pipe shed advanced support method
Technical Field
The invention relates to the technical field of tunnel advance support construction, in particular to a pipe shed advance support method.
Background
The pipe shed advanced support method is a new technology for excavating weak surrounding rock tunnels developed in recent years. The pipe-shed method is used as an auxiliary means for tunnel construction and plays a vital role in soft rock tunnel construction penetrating through broken belts and loose belts. The pipe shed adopts steel pipes as longitudinal supports, and steel arches as transverse annular supports, so that longitudinal and transverse integration is formed. Because the rigidity is high, the deformation of surrounding rock can be effectively avoided and reduced, and meanwhile, the pressure of the surrounding rock at an early stage can be borne.
At present, a pipe shed is commonly adopted in tunnel engineering, and because the topography above a tunnel anchor hole is steep, surrounding rocks are weathered and crushed more, and the rock quality is poor, in order to ensure the safety of entering the tunnel, the pipe shed is commonly adopted as an advanced support. The traditional pipe shed construction modes are two, namely, a hole forming construction process is directly drilled, a multifunctional drilling machine is used for drilling, after drilling to a designed depth, a pipe shed and a steel reinforcement cage in a pipe are installed, and grouting is timely carried out; secondly, a full sleeve follow-up construction process is adopted, a down-the-hole drill is used for drilling, the sleeve is followed up, and a reamer and a pipe shoe are arranged at the front end of the sleeve, so that the sleeve is ensured to follow up normally. And after the design depth is reached, installing the pipe shed and the steel reinforcement cage in the pipe shed, and finally pulling out the sleeve and grouting.
For the first mode, construction is carried out on broken high-strength stratum, pipe shed construction is carried out by adopting a direct drilling method, surrounding rock is in a broken shape, hole collapse phenomenon exists in the drilling process, along with deep excavation, a drill rod is influenced by lengthening and hole collapse, torque loss is too large, drilling cannot be carried out, and when the pipe shed is installed, the problem that the pipe shed cannot be jacked into place due to hole collapse exists, so that construction period delay and cost hyperbranched are easily caused.
For the second mode, when constructing under tunnel anchor main cable overlength condition, adopt full sleeve pipe follow-up construction, preceding 0 ~ 30m construction, the sleeve pipe follow-up is comparatively easy, after to 30m, the sleeve pipe is because the frictional force with the pore wall increases, leads to the jack-in difficulty, and drill way sleeve pipe department intensity is little, because the jack-in dynamics is big, leads to the drill way to appear the turn-up, and the jack-in needs the time to be long in place. After jacking in place, the pipe pulling construction is carried out before grouting, and the sleeve is not easy to pull out due to long pore canal and high friction resistance. The construction method has the advantages of low construction efficiency, high construction consumption, high construction cost and difficult guarantee of construction effect.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a pipe shed advanced support method, which adopts a double-sleeve follow-up drilling method to carry out construction, and the sleeve is followed in sections, so that the influences of frictional resistance and material strength can be overcome through a large sleeve and a small sleeve.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a pipe shed advanced support method comprises the following steps:
drilling to a first depth with a first casing assembly;
the first sleeve assembly is reserved, the pipe shed steel flower pipe assembly passes through the first sleeve assembly, and the pipe shed steel flower pipe assembly is used as a second sleeve assembly to be continuously drilled to a second depth;
installing a reinforcement cage in the pipe shed steel flower pipe assembly;
and after the reinforcement cage is installed, the first sleeve assembly is pulled out.
In some embodiments, after the first sleeve assembly is pulled out, the method further comprises the step of grouting into a pipe shed steel floral pipe assembly.
In some embodiments, further comprising:
after grouting, the slurry in the pipe is removed, and the pipe is tightly filled with cement mortar.
In some embodiments, prior to the drilling to the first depth with the first casing assembly, further comprising:
and (5) measuring and lofting the drilling platform according to the position of the pipe shed, and embedding the orifice positioning pipe.
In some embodiments, the orifice-positioning tube is a steel tube having a length of 1m that is phi 203 x 6 mm.
In some embodiments, the installing the reinforcement cage in the pipe shed steel flower pipe assembly comprises:
manufacturing a single-section reinforcement cage by utilizing a plurality of main ribs and steel pipe fixing rings;
and welding all the single-section reinforcement cages to finish the installation of the reinforcement cages.
In some embodiments, the first sleeve assembly comprises a first sleeve of phi 168 x 6mm, a first shoe of phi 168mm, and a first reaming sleeve of phi 180mm connected in sequence.
In some embodiments, the pipe shed steel pipe assembly includes a phi 108 x 6mm second sleeve, a phi 108mm second shoe, and a phi 130mm second reaming sleeve connected in sequence.
In some embodiments, the material of the first sleeve is Q235B and the material of the second sleeve is R780.
In some embodiments, the first depth is 30 meters and the second depth is 20.5 meters.
Compared with the prior art, the invention has the advantages that:
the pipe shed advanced support method of the invention drills to a first depth by utilizing a first sleeve assembly; the first sleeve assembly is reserved, the pipe shed steel flower pipe assembly passes through the first sleeve assembly and is used as a second sleeve assembly to continue to drill to a second depth; installing a reinforcement cage in the pipe shed steel flower pipe assembly; and after the reinforcement cage is installed, the first sleeve assembly is pulled out. The pipe shed is adopted as the sleeve jacking construction, the post pipe drawing process is omitted, and double sleeve follow-up drilling is adopted, so that the construction efficiency and the construction quality can be well ensured. In addition, when the rock mass is broken, and the surrounding rock is in a broken construction environment, the long and large pipe shed can be normally installed, and the problems of hole collapse and difficult hole forming can be effectively solved. The pipe shed advanced support method is simple and stable in operation, reliable in safety and overall stability, and capable of saving construction period, and the drill bit and the pipe shed are connected in a rigid mode, so that hole collapse and hole blocking are avoided, and drilling and jacking pipes are located at one time.
Drawings
FIG. 1 is a flow chart of a pipe shed advanced support method in an embodiment of the invention;
FIG. 2 is a schematic view of a first stage construction of a pipe shed in an embodiment of the invention;
fig. 3 is a schematic view of a first stage construction of a pipe shed according to an embodiment of the present invention.
Detailed Description
The following describes the invention in further detail, including preferred embodiments, by way of the accompanying drawings and by way of examples of some alternative embodiments of the invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
Further, in this application, relational terms such as "first" and "second", and the like, are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
It is worth to say, to tunnel anchor department stratum lithology relatively poor, tunnel anchor main cable overlength, entrance to a cave region are v level country rock, and country rock stability is poor and the stratum is broken more, and normal drilling is easy to collapse, the diameter is 108mm pipe canopy unable characteristics of installing. The embodiment of the invention provides a construction method of a large-size shed for breaking high-strength stratum, which adopts a double-sleeve follow-up drilling method to carry out construction, and the sleeves are followed in sections, so that the influences of friction resistance and material strength are overcome through a large sleeve and a small sleeve.
Specifically, referring to fig. 1, the embodiment of the invention discloses a pipe shed advanced support method, which comprises the following steps:
s1, drilling to a first depth by using a first casing assembly.
In this embodiment, the first depth is 30 meters and the first sleeve assembly includes a first sleeve of phi 168 x 6mm, a first shoe of phi 168mm, and a first reaming sleeve of phi 180mm connected in sequence.
Step S1 is a first stage, mainly drilling by using a first casing group with a larger diameter. Before drilling to the first depth by using the first sleeve assembly, the drilling platform is required to be measured and lofted according to the position of the pipe shed, and the orifice positioning pipe is pre-buried. The orifice positioning tube is a steel tube with the diameter of 203 multiplied by 6mm and the length of 1m.
S2, reserving the first sleeve assembly, enabling the pipe shed steel flower pipe assembly to pass through the first sleeve assembly, and continuing to drill to a second depth as a second sleeve assembly.
Step S2 is a second stage, and it is worth to say that the first sleeve component is not dismantled, but is used as a sleeve of the pipe shed steel flower pipe component, and the pipe shed steel flower pipe component is used as a pipe shed structure and is also used as a second sleeve component, and is sleeved in the first sleeve component to continue drilling.
In this embodiment, the second depth is 20.5 meters and the pipe shed steel flowtube assembly (second sleeve assembly) includes a phi 108 x 6mm second sleeve, a phi 108mm second shoe, and a phi 130mm second reaming sleeve connected in sequence.
S3, installing a reinforcement cage in the steel flower pipe assembly of the pipe shed.
Specifically, step S3 includes:
manufacturing a single-section reinforcement cage by utilizing a plurality of main ribs and steel pipe fixing rings; and welding all the single-section reinforcement cages to finish the installation of the reinforcement cages.
S4, after the reinforcement cage is installed, the first sleeve assembly is pulled out.
In some embodiments, after extracting the first sleeve assembly, the method further comprises the step of grouting into the pipe shed steel floral pipe assembly. In addition, the slurry in the pipe is removed after grouting is finished, and the pipe is tightly filled with cement mortar.
Referring to fig. 2 and 3, the present invention is further illustrated by a specific example:
the first step: measuring and positioning;
and (3) measuring and lofting the drilling platform according to the position of the pipe shed, embedding an orifice positioning pipe, wherein the orifice positioning pipe adopts a steel pipe with the diameter of phi 203 multiplied by 6mm, and the length of the orifice positioning pipe is 1m.
And a second step of: drilling holes;
the length of the tunnel shed is 50.5m, so the tunnel anchor long tunnel shed construction is performed by adopting a sleeve follow-up process, and the construction part is performed in two stages, so that the quality of the tunnel shed construction length is ensured to meet the design specification requirement.
When drilling, the axial deflection of the drill rod 5 needs to be strictly controlled, the drilling platform needs to be firm and stable, overrun displacement cannot be generated in the drilling process of the drilling machine, and the drilling deflection angle needs to be measured by using an inclinometer in the drilling process, if overrun, correction needs to be timely carried out.
The first-stage construction long pipe shed is constructed by adopting a first sleeve 2 with phi 168 multiplied by 6mm, wherein a first pipe shoe 3 with phi 168mm and a first reaming sleeve 4 with phi 180mm are arranged at the front end of the first sleeve 2, the first pipe shoe 3 plays a role of connecting a center drill bit 6 and the first sleeve 2, and the first reaming sleeve 4 ensures that the sleeve can follow up normally in the drilling process. The center of the first pipe shoe 3 is sleeved with a center drill bit 6, one end of the center drill bit 6 is connected with a drill rod 5, the other end of the center drill bit is clamped with a first reaming sleeve 4, and a matched groove is formed in the first reaming sleeve 4 and outside the first pipe shoe 3 for connection. After the drilling of the first 30m is completed, the first casing pipe 2, the first pipe shoe 3 and the first reaming sleeve 4 are temporarily reserved, the drill rod 5 and the drill bit 6 are pulled out, and the second-stage construction is prepared.
And the second stage construction is carried out at the back 20.5m, a second sleeve 7 with phi 108 multiplied by 6mm is adopted as a follow-up sleeve to continue drilling, and a second pipe shoe 8 with phi 108mm and a second reaming sleeve 9 with phi 130mm are arranged at the front end of the pipe shed pipe. One second sleeve 7 is installed every time drilling is performed, and when the drilling machine drills to the designed depth, the pipe shed is installed to the designed depth. After drilling to the designed depth, the drill rod 5 and the drill bit 6 are pulled out, the reinforcement cage is installed, and finally the first sleeve 2 of the front 30m is pulled out.
It should be noted that, in the present embodiment, the material of the first sleeve is Q235B, in order to avoid the fracture and the rolling of the hole due to the insufficient strength of the pipe shed during drilling, the length is increased, and the material of the second sleeve 7 is adjusted to be R780. The tensile strength of the R780 material ranges from 880 MPa to 902MPa, the yield strength ranges from 631 MPa to 658MPa, the pipe is hard and wear-resistant, and the characteristics of the material are obviously improved compared with those of the common Q235B steel pipe.
And a third step of: grouting;
the greenhouse uses a second sleeve 7 with phi 108 multiplied by 6mm, grouting holes of the second sleeve 7 are phi 8mm, the distance is 15cm, and the second sleeve 7 is arranged in a quincuncial shape. Grouting is carried out by adopting a high-pressure double-liquid grouting pump, the grouting material is cement slurry, the cement grade is 42.5, the cement-cement ratio is 1:1, the grouting pressure is 0.5-1.0 MPa, and the final pressure is 2.0MPa. The grouting adopts an orifice grouting pipe for grouting, a self-made orifice plugging device is utilized, an exhaust pipe and a grouting pipe are arranged at the orifice, a valve is used for controlling a switch, the exhaust pipe is inserted into the bottom of a hole, then the grouting pipe is connected, and grouting is stopped until cement slurry flows out from an exhaust hole and is used as a mark for finishing grouting. The grouting sequence is that the odd holes are poured first and then the even holes are poured according to the mode that the grouting sequence is performed from low to high and from bottom to top in a staggered way.
Fourth step: filling the orifice;
and after grouting is finished, the slurry in the pipe is timely removed, and cement mortar is used for tightly filling, so that the rigidity and the strength of the pipe shed are enhanced.
In summary, in the pipe shed advanced support method of the present invention, the first casing assembly is utilized to drill to a first depth; the first sleeve assembly is reserved, the pipe shed steel flower pipe assembly passes through the first sleeve assembly and is used as a second sleeve assembly to continue to drill to a second depth; installing a reinforcement cage in the pipe shed steel flower pipe assembly; and after the reinforcement cage is installed, the first sleeve assembly is pulled out. The pipe shed is adopted as the sleeve jacking construction, the post pipe drawing process is omitted, and double sleeve follow-up drilling is adopted, so that the construction efficiency and the construction quality can be well ensured. In addition, when the rock mass is broken, and the surrounding rock is in a broken construction environment, the long and large pipe shed can be normally installed, and the problems of hole collapse and difficult hole forming can be effectively solved. The pipe shed advanced support method is simple and stable in operation, reliable in safety and overall stability, and capable of saving construction period, and the drill bit and the pipe shed are connected in a rigid mode, so that hole collapse and hole blocking are avoided, and drilling and jacking pipes are located at one time.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A pipe shed advanced support method is characterized by comprising the following steps:
drilling to a first depth with a first casing assembly;
the first sleeve assembly is reserved, the pipe shed steel flower pipe assembly passes through the first sleeve assembly, and the pipe shed steel flower pipe assembly is used as a second sleeve assembly to be continuously drilled to a second depth;
installing a reinforcement cage in the pipe shed steel flower pipe assembly;
and after the reinforcement cage is installed, the first sleeve assembly is pulled out.
2. The pipe shed advanced support method according to claim 1, wherein the method comprises the following steps: and after the first sleeve assembly is pulled out, the method further comprises the step of grouting into the steel flower pipe assembly of the pipe shed.
3. The pipe shed advanced support method according to claim 2, wherein the method comprises the following steps: further comprises:
after grouting, the slurry in the pipe is removed, and the pipe is tightly filled with cement mortar.
4. The pipe shed advanced support method according to claim 1, wherein the method comprises the following steps: prior to said drilling to the first depth with the first casing assembly, further comprising:
and (5) measuring and lofting the drilling platform according to the position of the pipe shed, and embedding the orifice positioning pipe.
5. The pipe shed advanced support method according to claim 4, wherein the method comprises the following steps: the orifice positioning pipe is a steel pipe with the diameter of 203 multiplied by 6mm and the length of 1m.
6. The pipe shed advanced support method according to claim 1, wherein the method comprises the following steps: install the steel reinforcement cage in pipe canopy steel flower pipe subassembly, include:
manufacturing a single-section reinforcement cage by utilizing a plurality of main ribs and steel pipe fixing rings;
and welding all the single-section reinforcement cages to finish the installation of the reinforcement cages.
7. The pipe shed advanced support method according to claim 1, wherein the method comprises the following steps: the first sleeve assembly comprises a first sleeve with phi 168 multiplied by 6mm, a first pipe shoe with phi 168mm and a first reaming sleeve with phi 180mm which are connected in sequence.
8. The pipe shed advanced support method according to claim 7, wherein the method comprises the following steps: the pipe shed steel pipe assembly comprises a phi 108 multiplied by 6mm second sleeve, a phi 108mm second pipe shoe and a phi 130mm second reaming sleeve which are connected in sequence.
9. The pipe shed advanced support method according to claim 8, wherein the method comprises the following steps: the material of the first sleeve is Q235B, and the material of the second sleeve is R780.
10. The pipe shed advanced support method according to claim 1, wherein the method comprises the following steps: the first depth is 30 meters and the second depth is 20.5 meters.
CN202211732714.2A 2022-12-30 2022-12-30 Pipe shed advanced support method Pending CN116104535A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211732714.2A CN116104535A (en) 2022-12-30 2022-12-30 Pipe shed advanced support method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211732714.2A CN116104535A (en) 2022-12-30 2022-12-30 Pipe shed advanced support method

Publications (1)

Publication Number Publication Date
CN116104535A true CN116104535A (en) 2023-05-12

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ID=86257445

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Application Number Title Priority Date Filing Date
CN202211732714.2A Pending CN116104535A (en) 2022-12-30 2022-12-30 Pipe shed advanced support method

Country Status (1)

Country Link
CN (1) CN116104535A (en)

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