CN111577338A - Tunnel auxiliary supporting structure and construction method - Google Patents
Tunnel auxiliary supporting structure and construction method Download PDFInfo
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- CN111577338A CN111577338A CN202010351181.8A CN202010351181A CN111577338A CN 111577338 A CN111577338 A CN 111577338A CN 202010351181 A CN202010351181 A CN 202010351181A CN 111577338 A CN111577338 A CN 111577338A
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- 238000010276 construction Methods 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 88
- 239000010959 steel Substances 0.000 claims abstract description 88
- 239000002689 soil Substances 0.000 claims abstract description 29
- 238000005553 drilling Methods 0.000 claims description 27
- 230000007246 mechanism Effects 0.000 claims description 16
- 239000004568 cement Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000007569 slipcasting Methods 0.000 claims 6
- 238000009412 basement excavation Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002411 adverse Effects 0.000 abstract description 2
- 230000036544 posture Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
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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
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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
- E21D11/14—Lining predominantly with metal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses an auxiliary tunnel supporting structure and a construction method of the auxiliary tunnel supporting structure, wherein the auxiliary tunnel supporting structure comprises a vault supporting structure and a side wall supporting structure which are respectively arranged in soil layers above a vault of a tunnel and beside a primary support side wall, so that the overall rigidity of an original pre-support is effectively improved, the deformation of a road above the tunnel after excavation is reduced, the adverse effect on a buried pipeline is reduced, only steel plate protection needs to be laid on the ground after the arrangement, construction is not needed to be carried out in an open-cut road occupying mode, the influence on ground traffic is greatly reduced, and the construction cost is saved to a certain extent.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to an auxiliary supporting structure of a tunnel and a construction method.
Background
In the construction process of the existing subway tunnel, a subway entrance channel often needs to pass through a busy-traffic road section, a pipeline dense road section and be communicated with an existing line entrance, so that the influence on traffic is reduced as much as possible, the pipeline moving and changing difficulty is reduced, a pipe jacking method and a shallow-buried underground excavation method are often used, and the method for constructing the street crossing channel by underground excavation with less covering soil and high pipeline close-fitting difficulty is less.
Due to shallow overlying strata, close pipeline adhesion and busy traffic of the tunnel, the tunnel is subjected to underground excavation construction to have greater safety risk, and the traditional advanced small conduit supporting mode has poor effects on road settlement and pipeline protection.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art and provide an auxiliary tunnel supporting structure which can avoid road settlement and save cost.
The invention further provides a construction method of the tunnel auxiliary supporting structure.
The tunnel auxiliary supporting structure is arranged in soil layers inside and beside a tunnel and comprises a vault supporting structure arranged in the soil layer above a vault of the tunnel; the side wall supporting structure is arranged in a soil layer beside the primary side wall of the tunnel; the vault supporting structure and the side wall supporting structure respectively comprise a plurality of miniature steel pipes which are arranged in parallel, each miniature steel pipe extends along the radial direction of the tunnel, the adjacent miniature steel pipes are detachably connected through a mortise-tenon structure, one end of each miniature steel pipe inserted into a soil layer is respectively provided with a slope, and two ends of each miniature steel pipe are respectively sealed by sealing plates.
The tunnel auxiliary supporting structure provided by the embodiment of the invention at least has the following beneficial effects: this tunnel auxiliary supporting structure, including vault supporting structure and side wall supporting structure, the two sets up respectively in tunnel vault top and the other soil layer of first side wall, the whole rigidity of the advance support of former erectting has been improved effectively, it takes place to warp or subside to have reduced its top road behind the tunnel excavation, also reduced the harmful effects to burying the ground pipeline, and set up after only need lay the steel sheet protection on ground can, need not to adopt open cut to account for the way and construct, the influence to ground traffic has greatly been reduced, construction cost has also been saved to a certain extent.
According to some embodiments of the present invention, at least one grouting hole is formed in a wall surface of each of the micro steel pipes.
According to some embodiments of the invention, a grouting mechanism is detachably arranged at each grouting hole, the grouting mechanism comprises a grouting pipe and a switch valve arranged on the grouting pipe, and one end of the grouting pipe extends into the interior of the micro steel pipe from the grouting hole.
According to some embodiments of the present invention, the outer wall of each of the micro steel pipes is fixed with a tenon and a mortise respectively extending along the length direction of the micro steel pipe, and an included angle between the tenon and the mortise on the same micro steel pipe is 180 degrees.
According to some embodiments of the invention, the cross-sectional shape of the tenon is T-shaped.
According to some embodiments of the present invention, the material of each sealing plate is steel, and each sealing plate is connected to the micro steel pipe by welding.
According to some embodiments of the invention, each of the micro steel pipes is a seamless steel pipe.
The construction method of the tunnel auxiliary supporting structure according to the embodiment of the second aspect of the invention comprises the following steps: s1: overlapping the advance support structure; s2: locally dismantling the advanced support structure, and arranging a cast-in-situ bored pile to support a soil body of the tunnel; s3: installing a vault supporting structure, sequentially jacking each miniature steel pipe serving as a positioning pipe section by section into a soil layer by utilizing a miniature steel pipe drilling machine, monitoring the jacking track of the positioning pipe by utilizing a theodolite and water level measuring equipment in the jacking process, and sequentially inserting each conventional pipe in parallel by utilizing the miniature steel pipe drilling machine after the jacking of each positioning pipe is finished; s4: installing a side wall supporting structure, sequentially jacking each miniature steel pipe used as a positioning pipe section by section into a soil layer by utilizing a miniature steel pipe drilling machine, and sequentially inserting each conventional pipe in parallel by utilizing the miniature steel pipe drilling machine after each positioning pipe is jacked; s5: mounting grouting mechanisms on the grouting holes of the positioning pipes and the conventional pipes, and connecting a cement paste providing device by using the grouting mechanisms; and injecting cement slurry into each positioning pipe and the conventional pipe until the cement slurry overflows from the grouting hole.
According to some embodiments of the invention, the outer walls of the positioning pipes and the conventional pipes are symmetrically provided with tenons and mortises extending along the length direction of the micro steel pipe, and when the conventional pipes are inserted, the mortises and tenons on the conventional pipes are respectively locked with the tenons and the mortises on the positioning pipes on two sides of the conventional pipes.
According to some embodiments of the present invention, in the step S5, after 24 hours, the grouting mechanism is used to perform a second injection of cement slurry to each positioning pipe and conventional pipe.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
fig. 1 is a schematic connection diagram of micro steel pipes of a tunnel auxiliary supporting structure according to an embodiment of the present invention;
FIG. 2 is a side view of a micro-steel tube according to an embodiment of the present invention;
FIG. 3 is an assembly view of a micro steel pipe and a grouting mechanism according to an embodiment of the invention;
fig. 4 is a schematic diagram of the tunnel auxiliary supporting structure according to the embodiment of the invention after construction and installation.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 to 4, the tunnel auxiliary supporting structure of the embodiment of the present invention is installed inside and beside a tunnel in soil layers, and includes a vault supporting structure and a side wall supporting structure, wherein the vault supporting structure is arranged in the soil layer above the vault of the tunnel; the side wall supporting structure is arranged in a soil layer beside the primary side wall of the tunnel.
Specifically, vault supporting construction, side wall supporting construction include many miniature steel pipes 1 that set up side by side respectively, and each miniature steel pipe 1 all extends along the radial of tunnel, can dismantle the connection through tenon fourth of the twelve earthly branches structure between the adjacent miniature steel pipe 1, and the one end that each miniature steel pipe 1 inserts the soil layer is formed with domatic 11 respectively, and the both ends of each miniature steel pipe 1 utilize shrouding 2 to seal respectively.
According to the tunnel auxiliary supporting structure provided by the embodiment of the invention, the tunnel auxiliary supporting structure comprises a vault supporting structure and a side wall supporting structure which are respectively arranged in soil layers above a tunnel vault and beside a primary side wall, so that the overall rigidity of an original pre-support is effectively improved, the deformation or settlement of an upper road after tunnel excavation is reduced, the adverse effect on a buried pipeline is also reduced, only steel plate protection needs to be laid on the ground after the arrangement, the construction is not required to be carried out in an open-cut road occupying mode, the influence on ground traffic is greatly reduced, and the construction cost is also saved to a certain extent.
In some embodiments of the present invention, at least one grouting hole is formed in each wall surface of each micro steel pipe 1. Furthermore, a grouting mechanism 3 is detachably arranged at each grouting hole, wherein each grouting mechanism 3 comprises a grouting pipe 31 and a switch valve 32 arranged on the grouting pipe 31; one end of the grouting pipe 31 extends into the interior of the micro steel pipe 1 from the grouting hole, and the other end is connected to an external grout supply device.
More specifically, a tenon 41 and a mortise 42 extending along the length direction of the micro steel pipe 1 are respectively fixed on the outer wall of each micro steel pipe 1, and an included angle between the tenon 41 and the mortise 42 on the same micro steel pipe 1 is 180 degrees, that is, the tenon 41 and the mortise 42 are symmetrically arranged on the micro steel pipe 1. During assembly, the tenon 41 and the mortise 42 of the adjacent miniature steel pipes 1 are jointed, and the tenon-and-mortise structure is utilized for connection, so that the tightness of the lock catch is ensured, the problem of mutual position deviation of the miniature steel pipes 1 after being fastened does not need to be considered, and the correction steps in the construction process are simplified. Further, in the present embodiment, the cross section of each tenon 41 is T-shaped, and the cross section of the mortise 42 is a non-closed quadrangle with a notch. It should be noted that, in other embodiments, the cross section of the tenon 41 may be an ellipse, the cross section of the mortise 42 corresponding to this time is an elliptical ring, and the tenon 41 and the mortise 42 are respectively designed into an elliptical ring and an elliptical ring, so that the contact surfaces of the tenon 41 and the mortise 42 are smooth and have no edges, and thus, the process of inserting the lock between the micro steel pipes 1 can be more labor-saving and smooth, and meanwhile, the alignment operation between polygonal edges is reduced, which is helpful for improving the construction efficiency.
In some embodiments of the present invention, each sealing plate 2 is made of steel, and each sealing plate 2 is connected to the micro-steel tube 1 by welding to achieve sealing. More preferably, in the present embodiment, each of the micro steel pipes 1 is a seamless steel pipe.
The construction method of the tunnel auxiliary supporting structure according to the embodiment of the second aspect of the invention comprises the following steps: s1: locally dismantling the advance support structure, and arranging a cast-in-situ bored pile to support a soil body of the tunnel; s2: installing a vault supporting structure, sequentially jacking each miniature steel pipe 1 serving as a positioning pipe section by section into a soil layer by utilizing a miniature steel pipe 1 drilling machine, monitoring the jacking track of the positioning pipe by utilizing a theodolite and water level measuring equipment in the jacking process, and respectively and correspondingly inserting each conventional pipe between each adjacent positioning pipe by utilizing the miniature steel pipe 1 drilling machine after each positioning pipe is jacked; s3: installing a side wall supporting structure, sequentially jacking each miniature steel pipe 1 serving as a positioning pipe section by section into a soil layer by utilizing a miniature steel pipe 1 drilling machine, and after the jacking of each positioning pipe is finished, respectively and correspondingly inserting each conventional pipe into the middle of each adjacent positioning pipe by utilizing the miniature steel pipe 1 drilling machine; s4: mounting grouting mechanisms 3 on the grouting holes of the positioning pipes and the conventional pipes, and connecting a cement paste providing device by using the grouting mechanisms 3; and injecting cement slurry into each positioning pipe and the conventional pipe until the cement slurry overflows from the grouting hole so as to ensure the fullness of the cement slurry in the pipe.
Furthermore, the standard hole drilled after the positioning tube is jacked into the soil layer specifically comprises the following steps when each positioning tube is jacked for construction: 1. placing a drill rod in the positioning pipe, installing a drill bit and hoisting the drill rod to a working platform; 2. connecting the positioning pipe with a power head rotating output shaft of the micro steel pipe 1 drilling machine; 3. adjusting the insertion postures of the drilling machine and the positioning pipe of the miniature steel pipe 1 according to the designed insertion angle of the positioning pipe; 4. starting a micro steel pipe 1 drilling machine, driving a drill rod to rotate by using a power head of the micro steel pipe 1 drilling machine to carry out spiral soil discharging, and jacking a positioning pipe by eating soil through a jacking oil cylinder; 5. in the jacking process, a theodolite and water level measurement are utilized to monitor the jacking track of the positioning pipe in real time, and when the jacking track deviates from the designed track or the posture of the positioning pipe changes, correction is carried out in time; 6. after the single-section positioning pipe is pushed in, the positioning pipe and the micro steel pipe 1 drilling machine are disassembled, and the micro steel pipe 1 drilling machine is pulled back to the initial pushing position; 7. taking down a section of positioning pipe, arranging a drill rod in the positioning pipe, then hoisting the positioning pipe to a working platform, welding the front end of the positioning pipe with the installed positioning pipe, and connecting the rear end of the positioning pipe with a power head rotating output shaft of a micro steel pipe 1 drilling machine; 8. repeating the steps 4 to 7 until the positioning pipe is jacked to the designed depth; 9. and pulling out the drill rod in the positioning pipe, disassembling and hoisting back.
The construction of standard hole needs strict requirement precision control, and it plays the effect of exploration hole, therefore the work progress need be strict in the construction angle of controlling, equipment state in addition, still need to go on the record to the condition of slagging tap, and the abnormal conditions in the work progress to acquire detailed geology and hydrology condition, if find that groundwater pressure is higher, should in time report, and take emergency measures to carry out the shutoff.
Further, the specific construction of the conventional pipe comprises the following steps: 1. cleaning a field and building a construction platform; then, mounting and debugging the construction equipment; 2. determining the size and the number of the conventional pipes, and assembling the conventional pipes into a pipe row according to construction requirements; 3. putting a drill rod into each conventional pipe of the first group of pipe rows, installing a drill bit, hoisting the drill rod to a construction platform through hoisting equipment, and connecting each conventional pipe with each rotary output shaft of the power head of the micro steel pipe 1 drilling machine; 4. adjusting the hand-in postures of the drilling machine and the pipe row of the miniature steel pipe 1 according to the hand-in angle designed by the conventional pipe; 5. starting a micro steel pipe 1 drilling machine, driving a drill rod to rotate by using a power head of the micro steel pipe 1 drilling machine, performing spiral soil discharging, and pushing a pipe row to advance by using a pushing oil cylinder; in the jacking process, monitoring the jacking track of the pipe row in real time by using a guide device, and correcting the deviation in time when the jacking track deviates from the designed track; 6. after the single group of tube banks are jacked, disconnecting the power head of the drilling machine of the miniature steel tube 1 with the tube banks, and dragging the power head of the drilling machine of the miniature steel tube 1 back to the jacking initial position; the method comprises the following steps of (1) hoisting built-in drill rods of the next group of pipe rows to a working platform, wherein the built-in drill rods are respectively connected with the drill rods which are jacked into the pipe rows, the front ends of the conventional pipes are respectively welded with the rear ends of the jacked pipe rows, and the rear ends of the conventional pipes are respectively connected with the rotating output shafts of the power heads of the miniature steel pipe 1 drilling machines; 7. repeating the steps 5 and 6 until the pipe row is jacked to the designed depth, stopping jacking, and finishing the hole site construction; 8. sequentially pulling out the drill rods in the tube bank, disassembling and hoisting; then moving the drilling machine of the miniature steel pipe 1 to the construction position of the next row of pipe rows; 9. and (5) repeating the steps 3 to 8, and performing construction of the subsequent hole site tube rows of the conventional tubes until the whole tunnel is copied to the supporting structure.
In some embodiments of the present invention, the outer walls of the positioning pipes and the conventional pipe are symmetrically provided with a tenon 41 and a mortise 42 extending along the length direction of the micro steel pipe 1, and when the conventional pipe is inserted, the mortise 42 and the tenon 41 on the conventional pipe are respectively locked with the tenon 41 and the mortise 42 on the positioning pipes on two sides of the conventional pipe.
In some embodiments of the present invention, in step S5, after 24 hours, a secondary injection of cement slurry is required for each positioning pipe and conventional pipe by using the grouting mechanism 3.
The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope of the claims of the present application.
Claims (10)
1. The tunnel auxiliary supporting structure is installed in the soil horizon of tunnel side, its characterized in that includes:
the vault supporting structure is arranged in a soil layer above the vault of the tunnel;
the side wall supporting structure is arranged in a soil layer beside the primary side wall of the tunnel;
the vault supporting structure and the side wall supporting structure respectively comprise a plurality of miniature steel pipes which are arranged in parallel, each miniature steel pipe extends along the radial direction of the tunnel, the adjacent miniature steel pipes are detachably connected through a mortise-tenon structure, one end of each miniature steel pipe inserted into a soil layer is respectively provided with a slope, and two ends of each miniature steel pipe are respectively sealed by sealing plates.
2. The secondary tunnel support structure of claim 1, wherein: and the wall surface of each micro steel pipe is provided with at least one grouting hole.
3. The secondary tunnel support structure of claim 2, wherein: each grouting hole department all can dismantle and set up a slip casting mechanism, slip casting mechanism includes the slip casting pipe and installs the ooff valve on the slip casting pipe, the one end of slip casting pipe stretches into the inside of miniature steel pipe from the slip casting hole.
4. The secondary tunnel support structure of claim 1, wherein: the outer wall of each micro steel pipe is respectively fixed with a tenon and a mortise which extend along the length direction of the micro steel pipe, and the included angle between the tenon and the mortise which are positioned on the same micro steel pipe is 180 degrees.
5. The secondary tunnel support structure of claim 4, wherein: the cross section of the tenon is in a T shape.
6. The secondary tunnel support structure of claim 1, wherein: the sealing plates are made of steel, and are connected with the micro steel pipes through welding.
7. The secondary tunnel support structure of claim 1, wherein: each micro steel pipe is a seamless steel pipe.
8. The construction method of the tunnel auxiliary supporting structure is characterized by comprising the following steps:
s1: locally dismantling the advance support structure, and arranging a cast-in-situ bored pile to support a soil body of the tunnel;
s2: installing a vault supporting structure, sequentially jacking each miniature steel pipe serving as a positioning pipe section by section into a soil layer by utilizing a miniature steel pipe drilling machine, monitoring the jacking track of the positioning pipe by utilizing a theodolite and water level measuring equipment in the jacking process, and sequentially inserting each conventional pipe in parallel by utilizing the miniature steel pipe drilling machine after the jacking of each positioning pipe is finished;
s3: installing a side wall supporting structure, sequentially jacking each miniature steel pipe used as a positioning pipe section by section into a soil layer by utilizing a miniature steel pipe drilling machine, and sequentially inserting each conventional pipe in parallel by utilizing the miniature steel pipe drilling machine after each positioning pipe is jacked;
s4: mounting grouting mechanisms on the grouting holes of the positioning pipes and the conventional pipes, and connecting a cement paste providing device by using the grouting mechanisms; and injecting cement slurry into each positioning pipe and the conventional pipe until the cement slurry overflows from the grouting hole.
9. The construction method of a tunnel auxiliary supporting structure according to claim 8, wherein: each equal symmetry sets up tenon and the tongue-and-groove that extends along the length direction of miniature steel pipe on the outer wall of registration arm and conventional pipe, inserts when establishing conventional pipe, tongue-and-groove, tenon on the conventional pipe correspond the hasp rather than the tenon on the registration arm of both sides, tongue-and-groove respectively.
10. The construction method of a tunnel auxiliary supporting structure according to claim 8, wherein: in step S5, after 24 hours, the grouting mechanism is required to perform secondary injection of cement slurry into each positioning pipe and each conventional pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010351181.8A CN111577338A (en) | 2020-04-28 | 2020-04-28 | Tunnel auxiliary supporting structure and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010351181.8A CN111577338A (en) | 2020-04-28 | 2020-04-28 | Tunnel auxiliary supporting structure and construction method |
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| CN111577338A true CN111577338A (en) | 2020-08-25 |
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| CN202010351181.8A Pending CN111577338A (en) | 2020-04-28 | 2020-04-28 | Tunnel auxiliary supporting structure and construction method |
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Application publication date: 20200825 |
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