CN110486021A - Tunnel of large section is to two jacked piles with small section conversion construction methods - Google Patents
Tunnel of large section is to two jacked piles with small section conversion construction methods Download PDFInfo
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- CN110486021A CN110486021A CN201910791817.8A CN201910791817A CN110486021A CN 110486021 A CN110486021 A CN 110486021A CN 201910791817 A CN201910791817 A CN 201910791817A CN 110486021 A CN110486021 A CN 110486021A
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- section
- tunnel
- jacked piles
- small section
- small
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
Abstract
The invention discloses a kind of tunnel of large section to two jacked piles with small section conversion construction methods, the construction method, which divides forward tunnel of large section in fork position, repairs as the first jacked piles with small section and the second jacked piles with small section, tunnel of large section is constructed using two side-wall pilot tunnel, the pilot tunnel that tunnel of large section leads to the first jacked piles with small section side is excavated in advance to fork position, then start to excavate gradual change hole section in pilot tunnel end, gradual change hole section is located in the profile of the first jacked piles with small section, when the section of gradual change hole section is expanded to consistent with the section of the first jacked piles with small section, again by the anti-a part of hole section scraped out as the first jacked piles with small section of gradual change hole section.By design gradual change hole section, it can be achieved that safety support, improves working security of the tunnel of large section into jacked piles with small section conversion process；Then counter to gradual change hole section to be dug, realize smooth transition of the tunnel of large section to jacked piles with small section.
Description
Technical field
The present invention relates to tunnel construction technical fields, and in particular to a kind of tunnel of large section is converted to two jacked piles with small section
Construction method.
Background technique
In tunnel engineering, in order to enable road in hole or railway to lead to different directions, needing will in fork position
One tunnel point is repaired as two or more tunnels, and it is two or more for usually repairing a tunnel of large section point
Jacked piles with small section.
In the construction process, tunnel of large section point, which is repaired, is primarily present following difficulty for jacked piles with small section: first is that big cross section tunnel
Hole and jacked piles with small section exist compared with big cross section difference, and the section of fork position is converted difficult.Second is that due to two jacked piles with small section
Rock pillar width in fork position is small, intensity is low, is easy to damage occurs in work progress even to collapse, and has biggish construction
Difficulty and risk.Third is that fork position difficulty of construction is high, project amount is relatively large, is easy to delay construction speed.
The Chinese patent literature of Publication No. CN104265305A describes one kind and is merged into one from Liang Ge light section cavern
A big cross section cavern digs method, although the method in the patent document also can be realized section conversion, discomfort is shared
Liang Ge light section cavern is converted in big cross section cavern.
The Chinese patent literature of Publication No. CN109779653A describes a kind of soft rock large cross-section tunnel friendship fork construction
Method, this method are to lead to another tunnel after being turned by tunnel, need to perform super-front large pipe shed, and super-front large pipe shed
Construction needs larger space, repairs in the engineering for Liang Ge light section cavern by big cross section cavern point, and big cross section cavern is using double
When side heading method is constructed, steel tube shed is built without enough spaces.
Summary of the invention
The present invention is intended to provide a kind of tunnel of large section solves the prior art to two jacked piles with small section conversion construction methods
Middle tunnel of large section difficult technical problem of section conversion into jacked piles with small section work progress.
In order to solve the above technical problems, the invention adopts the following technical scheme:
A kind of tunnel of large section is designed to two jacked piles with small section conversion construction methods, the tunnel of large section fork position to
Preceding point is repaired as the first jacked piles with small section and the second jacked piles with small section, and the tunnel of large section is constructed using two side-wall pilot tunnel, institute
It states tunnel of large section and leads to the pilot tunnel of first jacked piles with small section side and excavated in advance to the fork position, then described
Pilot tunnel end starts to excavate gradual change hole section, and gradual change hole section is located in the profile of first jacked piles with small section, when it is described gradually
Become the section of hole section when being expanded to consistent with the section of first jacked piles with small section, then scrape out the gradual change hole section is counter as institute
State a part of hole section of the first jacked piles with small section.
Preferably, side of the gradual change hole section far from second jacked piles with small section is along first jacked piles with small section
Profile excavate, the other side of gradual change hole section, which gradually extends to the direction of second jacked piles with small section, to be digged, to increase
Section.
It preferably, will be along institute close to the borehole that second jacked piles with small section side is laid on face during anti-digging
The outline excavation toe-in certain distance of the first jacked piles with small section is stated, and reduces explosive payload, to prevent construction of explosion from causing institute
State the damage of rock pillar between the first jacked piles with small section and the second jacked piles with small section.
Preferably, counter to the gradual change hole section by the way of short drilling depth to be dug, and by manually cutting described first
It owes to dig part in jacked piles with small section profile.
Preferably, in the gradual change hole section digging process, the gradual change hole section is far from second jacked piles with small section side
The advanced tubule that the haunch of hole wall and arch perform is set with biggish outer declinate, and close to second jacked piles with small section one
Side Dong Bi does not perform advanced tubule.
Preferably, gradual change hole section immediate support steelframe in digging process, wherein close in the gradual change hole section
The steelframe of second jacked piles with small section side is interim steelframe, and the other side is the section phase with first jacked piles with small section
The steelframe matched.
Preferably, in the first jacked piles with small section digging process, increase by first jacked piles with small section close to described the
The quantity of the lock foot anchor tube performed on two jacked piles with small section side hole walls simultaneously reduces driving depth.
Preferably, it before excavating the gradual change hole section, first passes through flat pilot tunnel and is located at into second jacked piles with small section
The place of excavation in front of the fork position is reversely excavated, and performs lining cutting in time, until reversed excavate arrives the fork
Position.
Preferably, the lining cutting for connecting the tunnel of large section and the first light section tunnel are built in the fork position
The end wall that the lining cutting in hole, the second jacked piles with small section is connected.
Preferably, the lining cutting when building the end wall, in first jacked piles with small section and the second jacked piles with small section
Trolley runs to the fork position, for a part as the template for building the end wall.
The beneficial technical effect of the present invention lies in:
1. tunnel of large section provided by the invention can be real into the gradual change hole section that two jacked piles with small section conversion construction methods design
Existing safety support, improves working security of the tunnel of large section into jacked piles with small section conversion process；Then to gradual change hole section
It is counter to be dug, realize smooth transition of the tunnel of large section to jacked piles with small section.
2. in gradual change hole section and the first jacked piles with small section digging process, by changing advanced tubule, lock foot anchor tube
Laying mode, improve supporting intensity, avoid the damage to rock pillar between two jacked piles with small section.
3. counter by the way of short drilling depth dig gradual change tunnel, and anti-dig controls face borehole position and powder charge in the process
Amount, effectively avoids the damage to rock pillar.
4. being reached by flat pilot tunnel, fork position front is counter to the second jacked piles with small section to be dug, can be in the first light section tunnel
The excavation and support that the second jacked piles with small section is realized before the construction of hole, accelerates construction speed, while avoiding the first light section tunnel
Hole and the second jacked piles with small section excavate simultaneously in front of the position of fork and supporting is difficult.
5. doing basis using the lining trolley in the first jacked piles with small section and the second jacked piles with small section, the construction of end wall is reduced
The difficulty of middle formwork.
Detailed description of the invention
Fig. 1 is constructed tunnel by tunnel of large section of the present invention into two one embodiments of jacked piles with small section conversion construction method
Structural schematic diagram；
Fig. 2 is that tunnel of large section of the present invention uses double -side approach into two one embodiments of jacked piles with small section conversion construction method
The cross-section diagram for the tunnel of large section that method is excavated；
Fig. 3 is that tunnel of large section of the present invention tunnel of large section into two one embodiments of jacked piles with small section conversion construction method is branching off
The sectional schematic diagram of mouth position；
Fig. 4 is that tunnel of large section of the present invention is constructed schematic diagram into two one embodiments of jacked piles with small section conversion construction method；
Fig. 5 is that tunnel of large section of the present invention is constructed schematic diagram into two another embodiments of jacked piles with small section conversion construction method；
Fig. 6 is the section of tunnel of large section of the present invention end wall into two one embodiments of jacked piles with small section conversion construction method
Figure.
In figure, the signal of each label are as follows: main tunnel 10, tunnel of large section 11, left pilot tunnel 111, middle drift 112, right pilot tunnel 113,
Left side wall 114, right side wall 115, tunnel of large section lining cutting 116, the first jacked piles with small section 12, the first jacked piles with small section profile 121,
Top steelframe 122, normal section steelframe 1221, temporary support steelframe 1222, it is counter hollow out between the 123, first jacked piles with small section lining cutting
124, the second jacked piles with small section 13,131 fork position 14 of the second jacked piles with small section lining cutting, rock pillar 15, gradual change hole section 16, branch hole
17, end wall 18, flat pilot tunnel 20.
Specific embodiment
Illustrate the specific embodiment of invention with reference to the accompanying drawings and examples, but following embodiment is used only in detail
Illustrate the present invention, does not limit the scope of the invention in any way.
In the description of the present invention, it is to be understood that, term " on ", "lower", "front", "rear", "left", "right", "top",
The orientation or positional relationship of the instructions such as "bottom", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, merely to just
In description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with
Specific orientation construction and operation, therefore be not considered as limiting the invention.
Embodiment 1:
A kind of tunnel of large section is please referred to Fig.1 to Fig.4 to two jacked piles with small section conversion construction methods.
In Fig. 1, main tunnel 10 is the tunnel for railway construction, and main tunnel 10 has built flat pilot tunnel in process of construction
20, flat pilot tunnel 20 is the tunnel for assisting main tunnel 10 to construct, and the tunnel of large section 11 and first in the embodiment of the present invention is small
Section tunnel 12 and the second jacked piles with small section 13 belong to a part of main tunnel 10.Tunnel of large section 11 is before fork position 14
Side needs point to repair for the first jacked piles with small section 12 and the second jacked piles with small section 13, to lead to different directions for train.
As shown in Fig. 2, tunnel of large section 11 using two side-wall pilot tunnel construct, entire tunnel be divided into left pilot tunnel 111, in lead
Hole 112, right pilot tunnel 113 these three pilot tunnels respectively forwardly excavate, and left pilot tunnel 111 and right pilot tunnel 113 are constructed using three benching tunnelling methods, in
Pilot tunnel 112 divides for four step constructions, specifically, in Fig. 2 the step in left side 1., step 2., step be 3. three of left pilot tunnel 111
Construct step, the step on right side 4., step 5., step be 6. right pilot tunnel 113 three construction steps, the step at middle part 7., platform
Rank 8., step 9., step be 10. middle drift 112 four construction steps.
Construction step in each pilot tunnel be from top to bottom successively excavate forward, and left pilot tunnel 111, middle drift 112,
The depth that right pilot tunnel 113 excavates forward is staggered, and the excavation face between preventing influences each other, it is ensured that excavates the safety of work.
Left side wall 114, right side wall 115 are built up by steelframe and concrete, can play the role of gib, and the later period is by left side wall 114, right side
After wall 115 is removed, three pilot tunnels are merged into as tunnel of large section 11.
As shown in figure 3, left pilot tunnel 111 can directly lead in left pilot tunnel 111, middle drift 112, right pilot tunnel 113 these three pilot tunnels
To the first jacked piles with small section 12, in the present embodiment, left pilot tunnel 111 excavates in advance arrives fork position 14, then from left 111 end of pilot tunnel
End starts to carry out the construction of the first jacked piles with small section 12, and middle drift 112, the subsequent follow-up of right pilot tunnel 113 prevent fork position more than 14
Kind construction operation carries out simultaneously, thus can reduce the construction risk and supporting difficulty of fork position 14.
Since the section of left pilot tunnel 111 is less than the section of the first jacked piles with small section 12, fork position is arrived when left pilot tunnel 111 excavates
When setting 14, it is difficult to the first jacked piles with small section 12 is directly excavated directly since left 111 end of pilot tunnel, for this purpose, as shown in figure 4, first
Gradual change hole section 16 is excavated, gradual change hole section 16 is located in the first jacked piles with small section profile 121, when the section of gradual change hole section 16 is expanded to
When consistent with the section of the first jacked piles with small section 12, then gradual change hole section 16 counter scraped out as a part of the first jacked piles with small section 12
Hole section.
By design gradual change hole section 16, left pilot tunnel 111 can be smoothly to 12 transition of the first jacked piles with small section, gradual change hole section 16
Hole wall can realize safety support, it is ensured that safety of the left pilot tunnel 111 into 12 section conversion process of the first jacked piles with small section.
In the present embodiment, gradual change hole section 16 is in the construction process it should be noted that following requirement:
(1) gradual change hole section 16 is in digging process, and the side far from the second jacked piles with small section 13 is along the first jacked piles with small section
Profile 121 excavates, and the other side of gradual change hole section 16, which gradually extends to the direction of the second jacked piles with small section 13, to be digged, disconnected to increase
Face.Excavate in this manner, the later period is anti-to 16 right side of gradual change hole section dig after can be directly as the one of the first jacked piles with small section 12
Part hole section, can be improved construction efficiency, guarantee construction order.
(2) gradual change hole section 16 wants immediate support steelframe in digging process, wherein small close to second in gradual change hole section 16
The steelframe of 13 side of section tunnel is interim steelframe, and the other side is the steelframe to match with the section of the first jacked piles with small section 12.
Gradual change hole 16 later periods of section are counter, and the interim steelframe of supporting is removable when digging, remaining steelframe reduces work when anti-dig without disassembly
Amount.
(3) due to about 1.1 meters of the most narrow place of the rock pillar 15 between the first jacked piles with small section 12 and the second jacked piles with small section 13,
It is highly susceptible to damage, rock pillar 15 damages in order to prevent, and gradual change hole section 16 is not applied close to 13 side Dong Bi of the second jacked piles with small section
Advanced tubule is done, prevents advanced tubule from damaging rock pillar 15；But in order to enhance the supporting intensity to gradual change hole section 16, In
Gradual change hole 16 haunches and arch far from 13 side hole wall of the second jacked piles with small section of section need to perform advanced tubule, and this is advanced
Ductule is set with biggish outer declinate, to enhance supporting intensity.
(4) after gradual change hole section 16 is instead dug and the first jacked piles with small section is excavated forward in subsequent 16 continuation along gradual change hole section
During 12, increase the number for the lock foot anchor tube that the first jacked piles with small section 12 performs on 13 side hole wall of the second jacked piles with small section
Driving depth is measured and reduces, lock foot anchor tube can prevent damage rock pillar 15 after shortening, and the quantity for increasing lock foot anchor tube can then enhance
Foot anchor tube is locked to the supporting intensity for setting up steelframe.
The excavation of gradual change hole section 16 and anti-excavation formula are specific as follows:
Step 1: as shown in figure 3, by gradual change hole section 16 points for top bar (11), middle step (12), get out of a predicament or an embarrassing situation (13), according to upper, middle and lower
Three steps excavate gradual change hole section 16.
The top bar of gradual change hole section 16 is excavated in advance, and the left side of top bar is consistent with the first jacked piles with small section profile 121；It opens
During digging, the steelframe 122 on top bar arch immediate support top, and advanced tubule is performed in time and for fixing upper steel
The lock foot anchor tube of frame 122；As shown in figure 3, steelframe 122 left part in top is normal section steelframe 1221, right side transition is interim
Supporting steel frame 1222, using the interim fixed temporary support steelframe 1222 of lock foot anchor tube；After 7 top Pin steelframe 122 of supporting, gradual change
The section of hole section 16 is expanded in the same size with the section of the first jacked piles with small section 12.
Step 2: the middle step of gradual change hole section 16 lags (about 5 meters) progress excavation supportings of top bar a distance, middle step
Step right side excavation supporting in progress after left side carries out 2 meters of excavation supporting according to the normal section of the first jacked piles with small section 12；In
The corresponding middle part steelframe of immediate support during bench excavation, and advanced tubule is performed in time and for fixed middle part steelframe
Lock foot anchor tube, normal section steelframe 1221 spreading of the steelframe of supporting in step 1 on the left of middle step, right side supporting it is interim
Temporary support steelframe 1222 spreading of the middle part steelframe in step 1, middle step also according to 7 Pin steelframes by section gradient to
First jacked piles with small section, 12 section size is identical, and the interim middle part steelframe on the right side of middle step is fixed using interim lock foot anchor tube.
Step 3: the middle bench excavation supporting to gradual change hole section 16 is extremely identical as 12 section size of the first jacked piles with small section
When, top bar and middle step face to gradual change hole section 16 carry out spray concrete closing, then small with first from gradual change hole section 16
The identical position of 12 section size of section tunnel starts to gradual change hole 16 top bars of section and middle step is counter is dug.
It is counter to gradual change hole section 16 by the way of short drilling depth to be dug, it is small disconnected close to second on face during anti-digging
The borehole that tunnel 13 side in face is laid will be along 60 centimetres of 121 toe-in of the first jacked piles with small section profile, and reduces explosive payload, with
Prevent construction of explosion from causing the damage of rock pillar 15 between the first jacked piles with small section 12 and the second jacked piles with small section 13, and by artificial
It cuts and owes to dig part in the first jacked piles with small section profile 121.It is anti-dig during, gradually remove temporary support steelframe 1222, interim
Middle part steelframe and interim lock foot anchor tube, and immediate support is corresponding with 12 right lateral contours of the first jacked piles with small section replaces steelframe,
Squeeze into the short lock foot anchor tube for fixed replacement steelframe.
Counter in Fig. 4 hollow out between 123 and gradual change hole section 16 a part of hole section of the first jacked piles with small section 12 is collectively formed.
Step 4: excavate gradual change hole section 16 and it is counter hollow out between 123 get out of a predicament or an embarrassing situation, get out of a predicament or an embarrassing situation and gradually opened from left side to right side
Dig supporting, until gradual change hole section 16 and it is counter hollow out between top bar in 123, middle step and get out of a predicament or an embarrassing situation and to form three stepped section cloth
Office.Get out of a predicament or an embarrassing situation supporting lower steelframe along replacement steelframe spreading, and set lock foot anchor tube for fixed lower steelframe.
So far, the excavation of gradual change hole section 16 and anti-digging work finish.Then can along gradual change hole section 16 and it is counter hollow out between 123
It interior top bar, middle step and gets out of a predicament or an embarrassing situation and to form three stepped sections layout and continue to excavate the first jacked piles with small section 12 forward, and
Carry out the construction of remaining pilot tunnel and the second jacked piles with small section 13 of tunnel of large section 11.
Embodiment 2:
A kind of tunnel of large section is to two jacked piles with small section conversion construction methods, also referring to Fig. 1 to Fig. 6.
In view of speed of application is slow at fork position 14, the construction speed of entire tunnel engineering will receive influence, and put down
The section of pilot tunnel 20 is less than main tunnel 10, and a rate of advance of flat pilot tunnel 20 is very fast, and therefore, the difference of the present embodiment and embodiment 1 exists
In first passing through flat pilot tunnel 20 and excavate branch hole 17 and be located at fork into the second jacked piles with small section 13 before excavating gradual change hole section 16
The place of excavation in 14 front of position is reversely excavated, and performs lining cutting in time, until reversed excavate arrives fork position 14.
When tunnel of large section 11 is excavated to fork position 14, the anti-hole Duan Keyu big cross section dug of the second jacked piles with small section 13
Tunnel 11 directly docks, rather than the second jacked piles with small section 13 is just carried out when tunnel of large section 11 is excavated to fork position 14
Work is excavated, therefore accelerates construction speed.
On the other hand, since the first jacked piles with small section 12 and the second jacked piles with small section 13 are adjacent in 14 front of fork position,
Mutual influence is especially big, first carries out the anti-digging and supporting of the second jacked piles with small section 13, is equivalent to attached in fork position 14
Both it will closely be staggered during the excavation work of the second jacked piles with small section 13 and the excavation work of the first jacked piles with small section 12, avoid
Construction influences each other.
Further, connection tunnel of large section lining cutting 116 and the first jacked piles with small section lining cutting are built in fork position 14
124, the end wall 18 that the second jacked piles with small section lining cutting 131 is connected.
The construction of end wall 18 is specific as follows:
Step 1: 80 cm thicks are cut forward in area using pneumatic pick when tunnel of large section 11 is excavated to fork position 14,
Wall splash guard in end is carried out after the completion of cutting and is laid with operation, and splash guard is laid at face, and splash guard and the first light section
The splash guard that tunnel 12 and 13 side lining cutting end of the second jacked piles with small section are reserved is connected as entirety, it is ensured that waterproof effect.
Step 2: being laid with steel mesh in the space cut, the outer edge of steel mesh is corresponding to be supported on tunnel of large section lining
Build 116 inner peripheral surface, the edge branch that steel mesh is contacted with the first jacked piles with small section lining cutting 124, the second jacked piles with small section lining cutting 131
Support the outer peripheral surface in the first jacked piles with small section lining cutting 124, the second jacked piles with small section lining cutting 131.
Step 3: the lining trolley in the first jacked piles with small section 12 and the second jacked piles with small section 13 is run to fork position
14 are set, for a part as the template for building end wall；Then with the first jacked piles with small section 12 and the second light section tunnel
Lining trolley end head formwork and end wall form are installed based on the lining trolley in hole 13.
Step 5: the lining cutting after the completion of the wall form supporting of end at progress lining trolley pours and end wall pours, to
The concrete poured carries out demoulding after reaching 75% intensity, in time to surface polishing, the maintenance of end wall 18 after demoulding.
End wall with a thickness of 80 centimetres, can be bonded and support the first jacked piles with small section lining cutting, the second light section
Tunnel lining and tunnel of large section lining cutting tip position prevent the tip position earthwork from collapsing, and by the first jacked piles with small section and
Lining trolley in second jacked piles with small section is basic formwork, keeps the formwork of end wall more convenient.
The present invention is described in detail above in conjunction with drawings and examples, still, those of skill in the art
Member is it is understood that without departing from the purpose of the present invention, can also carry out each design parameter in above-described embodiment
Change, forms multiple specific embodiments, is common variation range of the invention, is no longer described in detail one by one herein.
Claims (10)
1. a kind of tunnel of large section is to two jacked piles with small section conversion construction methods, the tunnel of large section fork position forward
Divide and repair as the first jacked piles with small section and the second jacked piles with small section, which is characterized in that
The tunnel of large section is constructed using two side-wall pilot tunnel, and the tunnel of large section leads to first jacked piles with small section one
The pilot tunnel of side is excavated in advance to the fork position, then starts to excavate gradual change hole section, the gradual change hole in the pilot tunnel end
Section is located in the profile of first jacked piles with small section, when the section of the gradual change hole section is expanded to and the first light section tunnel
When the section in hole is consistent, then by the anti-a part of hole section scraped out as first jacked piles with small section of gradual change hole section.
2. tunnel of large section according to claim 1 is to two jacked piles with small section conversion construction methods, which is characterized in that institute
State gradual change hole section far from second jacked piles with small section side along first jacked piles with small section profile excavate, it is described gradually
The other side for becoming hole section, which gradually extends to the direction of second jacked piles with small section, to be digged, to increase section.
3. tunnel of large section according to claim 1 is to two jacked piles with small section conversion construction methods, which is characterized in that anti-
It, will be along first jacked piles with small section close to the borehole that second jacked piles with small section side is laid on face during digging
Outline excavation toe-in certain distance, and reduce explosive payload, with prevent construction of explosion cause first jacked piles with small section and
The damage of rock pillar between second jacked piles with small section.
4. tunnel of large section according to claim 3 is to two jacked piles with small section conversion construction methods, which is characterized in that adopt
It is dug with the mode of short drilling depth is counter to the gradual change hole section, and is owed by manually cutting in the first jacked piles with small section profile
Dig part.
5. tunnel of large section according to claim 1 is to two jacked piles with small section conversion construction methods, which is characterized in that institute
It states in the section digging process of gradual change hole, haunch and arch of the gradual change hole section far from second jacked piles with small section side hole wall are applied
The advanced tubule done is set with biggish outer declinate, and is not performed close to second jacked piles with small section side Dong Bi advanced small
Conduit.
6. tunnel of large section according to claim 1 is to two jacked piles with small section conversion construction methods, which is characterized in that institute
State gradual change hole section immediate support steelframe in digging process, wherein close to the second light section tunnel in the gradual change hole section
The steelframe of hole side is interim steelframe, and the other side is the steelframe to match with the section of first jacked piles with small section.
7. tunnel of large section according to claim 1 is to two jacked piles with small section conversion construction methods, which is characterized in that institute
It states in the first jacked piles with small section digging process, increases by first jacked piles with small section close to second jacked piles with small section side hole
The quantity of the lock foot anchor tube performed on wall simultaneously reduces driving depth.
8. tunnel of large section according to claim 1 is to two jacked piles with small section conversion construction methods, which is characterized in that In
Before excavating the gradual change hole section, first passes through flat pilot tunnel and be located in front of the fork position into second jacked piles with small section
The place of excavation is not excavated reversely, and performs lining cutting in time, until reversed excavate arrives the fork position.
9. tunnel of large section according to claim 1 is to two jacked piles with small section conversion construction methods, which is characterized in that In
The lining cutting for connecting the tunnel of large section and first jacked piles with small section, the second jacked piles with small section are built in the fork position
The end wall that lining cutting is connected.
10. tunnel of large section according to claim 9 is to two jacked piles with small section conversion construction methods, which is characterized in that
When building the end wall, the lining trolley in first jacked piles with small section and the second jacked piles with small section runs to described
Fork position, for a part as the template for building the end wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910791817.8A CN110486021B (en) | 2019-08-26 | 2019-08-26 | Construction method for converting large-section tunnel into two small-section tunnels |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910791817.8A CN110486021B (en) | 2019-08-26 | 2019-08-26 | Construction method for converting large-section tunnel into two small-section tunnels |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110486021A true CN110486021A (en) | 2019-11-22 |
| CN110486021B CN110486021B (en) | 2021-01-26 |
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| CN201910791817.8A Active CN110486021B (en) | 2019-08-26 | 2019-08-26 | Construction method for converting large-section tunnel into two small-section tunnels |
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| CN110924974A (en) * | 2019-11-28 | 2020-03-27 | 云南省建设投资控股集团有限公司 | Construction method of branch tunnel |
| CN113431588A (en) * | 2021-07-30 | 2021-09-24 | 中铁十四局集团第三工程有限公司 | Construction method for branch tunnel |
| CN114109447A (en) * | 2021-12-03 | 2022-03-01 | 中铁隧道局集团有限公司 | Construction method for separately repairing end wall of tunnel |
| CN114320319A (en) * | 2021-11-09 | 2022-04-12 | 珠海华昕开发建设有限公司 | Construction method for expanding excavation from extremely-small section to extremely-large section of tunnel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110924974A (en) * | 2019-11-28 | 2020-03-27 | 云南省建设投资控股集团有限公司 | Construction method of branch tunnel |
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| CN113431588A (en) * | 2021-07-30 | 2021-09-24 | 中铁十四局集团第三工程有限公司 | Construction method for branch tunnel |
| CN113431588B (en) * | 2021-07-30 | 2022-07-22 | 中铁十四局集团第三工程有限公司 | Construction method for branch tunnel |
| CN114320319A (en) * | 2021-11-09 | 2022-04-12 | 珠海华昕开发建设有限公司 | Construction method for expanding excavation from extremely-small section to extremely-large section of tunnel |
| CN114109447A (en) * | 2021-12-03 | 2022-03-01 | 中铁隧道局集团有限公司 | Construction method for separately repairing end wall of tunnel |
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| CN110486021B (en) | 2021-01-26 |
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