CN110145314A - A kind of method that the tall and big Core Soil of extra-large cross-section bored tunnel is removed - Google Patents
A kind of method that the tall and big Core Soil of extra-large cross-section bored tunnel is removed Download PDFInfo
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- CN110145314A CN110145314A CN201910390833.6A CN201910390833A CN110145314A CN 110145314 A CN110145314 A CN 110145314A CN 201910390833 A CN201910390833 A CN 201910390833A CN 110145314 A CN110145314 A CN 110145314A
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- tunnel
- core soil
- base tunnel
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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
-
- 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
Abstract
The present invention provides the methods that a kind of tall and big Core Soil of extra-large cross-section bored tunnel is removed, and include the following steps: step 1: one upper lateral part of Core Soil on top is longitudinally excavated along tunnel to form the first base tunnel；First base tunnel is in a horizontal state；Step 2: another upper lateral part of Core Soil on top is longitudinally excavated along tunnel to form the second base tunnel being in a horizontal state；The Core Soil on top is excavated after promoting the first base tunnel and the second base tunnel to excavation direction to form the interconnection perpendicular to the first base tunnel and the second base tunnel；Step 3: excavating the first base tunnel to form the first step group including several steps, each length of bench of composition first step group is 3-5m；Step 4: laterally the Core Soil on dismounting top is the step tunneling boring of 6m with formation length；Step 5: excavated downwards below the second base tunnel to form the second step group for including several steps；Step 6: carrying out Core Soil inverted arch excavation and inverted arch two of constructing serves as a contrast；Step 7: carrying out the lining construction of tunnel big cross section two.
Description
Technical field
The present invention relates to constructing tunnel fields, and in particular to a kind of side that the tall and big Core Soil of extra-large cross-section bored tunnel is removed
Method.
Background technique
It is especially big involved in urban track traffic in civilian infrastructure construction as the paces that China develops increasingly are accelerated
Section shallow bored tunnel increases increasingly, becomes the big characteristic in urban construction, how in the prosperity urban district of city quickly, peace
Urban underground Tunnel is built entirely as urgent problem.
Following two method is primarily present in the prior art to hole: extra-large cross-section bored tunnel commonly excavate CD method be by
Big cross section divides left and right sidewall, and branch carries out, and completes left side wall and excavates, forms left side supporting and mid-board temporary support.It is unilateral
There are still larger security risk when wall is constructed, top is there are being easy to cause bias when building, and unilateral wall earthwork is big, after
Interim partition wall temporary support removes that difficulty is big, and operation height is high, and risk is big, while a side wall is as construction channel, vehicle into
It is inconvenient out.It is one-way construction that common two side-wall pilot tunnel, which excavates, and work surface interference is big, in Station with when give it is attached
The construction time limit of entrance is too short, and the Core Soil formed after the landing of two sides base tunnel is excessively tall and big, and dismounting difficulty is very big, security risk
It is high.
Summary of the invention
The present invention is to solve removing in the prior art, the tall and big Core Soil risk in tunnel is high, difficulty is big, temporary support is torn open
Except difficult problem, in view of this, the object of the present invention is to provide the sides that a kind of tall and big Core Soil of extra-large cross-section bored tunnel is removed
Method, this method, which can effectively improve construction speed while avoid, removes difficult problem because Core Soil is excessively tall and big, ensure that
Construction transportation tissue, traffic convenience, Core Soil longest time limit play supporting role, greatly improve working security, ensure top
Building safety.
To achieve the above object, present invention employs the following technical solutions:
A kind of a kind of tall and big core of extra-large cross-section bored tunnel of method that the tall and big Core Soil of extra-large cross-section bored tunnel is removed
The method that soil is removed, includes the following steps:
Step 1: one upper lateral part of Core Soil on top is longitudinally excavated along tunnel to form the first base tunnel, and to the core on top
Cubsoil carries out supporting；
First base tunnel is in a horizontal state, and the Core Soil on the top is located at tunnel upper middle position；
Step 2: another upper lateral part of Core Soil on top is longitudinally excavated along tunnel is led with forming be in a horizontal state second
Hole, the face of the second base tunnel are 15m along tunneling direction distance away from the first base tunnel face；
The Core Soil that top is excavated after promoting the first base tunnel and the second base tunnel to excavation direction is led with being formed perpendicular to first
The interconnection in hole and the second base tunnel；
Step 3: excavating the first base tunnel to form the first step group including several steps, form each of first step group
Length of bench is 3-5m；
Step 4: laterally the Core Soil on dismounting top is the step tunneling boring of 6m with formation length；
Step 5: excavated downwards below the second base tunnel to form the second step group for including several steps；
Step 6: carrying out Core Soil inverted arch excavation and inverted arch two of constructing serves as a contrast；
Step 7: carrying out the lining construction of tunnel big cross section two.
Further, second base tunnel horizontal width is 8m in the step 1, and vertical height is 8m.
One step, in the step 2 after second excavation with guide pit, the Core Soil indwelling width on top is 5.6m.
One step, second lower base tunnel and the Core Soil on top divide step is synchronous to excavate in the step 5, to form wide 14m
The rectangular-shaped step of height 3m.
Compared with the prior art, the invention has the following beneficial effects:
(1) working efficiency of construction is improved, the dismounting efficiency of especially big cross section Core Soil greatly improves, and reduces chief engineer
Phase；
(2) reduce big cross section Core Soil gib, save cost and activity time.
(3) Core Soil on top laterally excavates the interconnection formed, and construction transportation tissue is convenient；
(4) supporting is carried out to Core Soil, and excavating is step-like progress, the soil for not having top in this way falls security performance
It is high.
When the essence of this method is that extra-large cross-section excavates, constructed in advance by the first base tunnel on the left of the Core Soil of top, core
Second base tunnel on native right side follows and opens up interconnection by remaining core soil in advance interval after propulsion, further according to step sequence subdividing by
Step promotes the first base tunnel of left side, and middle and lower part Core Soil and the second base tunnel of right side synchronous bench cut downwards form more work surfaces,
Greatly improve construction speed；Central nucleus cubsoil follows the second base tunnel of right side is synchronous to remove, and efficiently solves tall and big Core Soil and removes
The problems such as difficulty, risk is high；Through the base tunnel on interconnection connection double side wall, construction transportation tissue is effectively solved；With conventional tunnel
Road excavation method is compared, and extra-large cross-section bored tunnel of the present invention reserves median septum step and removes tall and big Core Soil excavation
Method can effectively control tall and big Core Soil and remove risk, reduce rock mass disturbance, the first base tunnel and the second base tunnel face it is longitudinal away from
It can construct simultaneously from 15m, improve the efficiency of construction, save a variety of materials dosage and mechanical equipment used time, reduce
The mechanical equipment proportion of goods damageds；
More former CD, double side wall excavation method, this engineering method operate and are easier to realize, section excavation effect is good, excavate progress
Fast and security performance is high.
Further advantage, target and feature of the invention will be partially reflected by the following instructions, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Detailed description of the invention
Fig. 1 is constructing tunnel schematic three dimensional views of the present invention；
Fig. 2 is tunnel lateral direction section construction way schematic diagram of the present invention；
Fig. 3 is that tunnel excavation of the present invention walks sequence elevational schematic view；
Fig. 4 is that tunnel top of the present invention Core Soil reserves the horizontal longitudinal schematic diagram of rock pillar；
Fig. 5 is that tunnel top of the present invention Core Soil reserves rock pillar schematic longitudinal section.
Appended drawing reference in figure: the first base tunnel 1, the second base tunnel 2, first step group 3, Core Soil 6, interconnection 61, second
Step group 7, the lining of inverted arch 10, two 11, reserved rock pillar 12.
Specific embodiment
In order to make the present invention realize technological means, creation characteristic, reach purpose and effect more clearly and be apparent to,
The present invention is further elaborated with reference to the accompanying drawings and detailed description:
A kind of method that the tall and big Core Soil of extra-large cross-section bored tunnel is removed, includes the following steps:
Fig. 1 is constructing tunnel schematic three dimensional views of the present invention；Fig. 2 is tunnel lateral direction section construction way schematic diagram of the present invention；
Fig. 3 is that tunnel excavation of the present invention walks sequence elevational schematic view；Fig. 4 reserves 12 level of rock pillar for tunnel top of the present invention Core Soil 6 and indulges
To schematic diagram；Fig. 5 is that tunnel top of the present invention Core Soil 6 reserves 12 schematic longitudinal section of rock pillar.
A kind of method that the tall and big Core Soil of extra-large cross-section bored tunnel is removed, comprising the following steps:
Step 1: 6 first base tunnel 1 of left side of Core Soil on top excavates, and 6 one upper lateral part of Core Soil on top is vertical along tunnel
To excavating to form the first base tunnel 1, while supporting is carried out to the Core Soil on top 6.
Step 2: Core Soil 6 the second base tunnel 2 of right side in top excavates, and another upper lateral part of Core Soil 6 on top is vertical along tunnel
To excavating to form the second base tunnel 2 being in a horizontal state, the face of the second base tunnel is away from the first base tunnel face along tunneling direction
Distance be 15m, face is a common technical term in tunnel construction, namely excavate tunnel Tunnel Engineering in constantly to
Be pushed forward into working face, be the equal of the first base tunnel and the second base tunnel be it is interleaved come, be guarantee one safety meet
On the other hand code requirement can thus enable the first base tunnel and the second base tunnel to construct simultaneously, improve construction
Efficiency.
First base tunnel 1 of 6 left and right sides of Core Soil and the second base tunnel 2 are promoted centainly towards front (i.e. tunnelling direction)
After distance, depending on actual conditions, to top Core Soil 6, laterally (i.e. perpendicular to the mode of the first base tunnel 1 and the second base tunnel 2) segmentation is opened
It digs (every section of excavation 10m), formation length is not less than the reserved rock pillar 12 of 20m, on the one hand prevents from collapsing in this way, is on the other hand formed
Interconnection 61 forms cargo, the road that construction personnel passes through, is convenient for contacted tissue.
Step 3: 6 left side staged multi-step of top Core Soil driving, that is, excavating the first base tunnel 1 to be formed includes several
The first step group 3 of rank, it is progressive using multi-step mode, under being unfolded in the left side of top Core Soil 6 from top to bottom in upper, left side into
The multiple operation surface constructions of row, each length of bench of composition first step group 3 are 3-5m.
Step 4: top Core Soil 6 excavates, and is laterally removed using 6 second base tunnel of right side 2 of Core Soil on established top
The Core Soil 6 on top is the step tunneling boring of 6m with formation length.
Step 5: excavated downwards below the second base tunnel 2 to form the second step group 7 for including several steps, staged is more
Step is progressive, and carries out supporting in time.
Step 6: inverted arch 10 excavates, and inverted arch 10 is to improve top supporting construction stress condition and the anti-of tunnel bottom is arranged in
It is one of chief component of tunnel structure to domes, it is popular to be construed to the arch faced upward.Carry out 6 inverted arch of Core Soil
10 excavations and the lining of inverted arch 10 2 11 of constructing.
Step 7: carrying out 11 construction of the lining of tunnel big cross section two, determine that secondary lining is applied by country rock convergent deformation monitoring data
It does opportunity, big cross section secondary lining utilizes telescoping steel form, the long 6m of trolley completes big cross section two and serve as a contrast 11 length to be 6m every time.Match
It closes reinforcement trolley and first completes waterproof, reinforcing bar binding, two lining 11 telescoping steel forms follow-ups, a mould 6m bis- lining 11 is completed in trolley formwork positioning
Concreting, then next 11 construction of the lining of mould big cross section two of incremental progress.
Technological principle of the present invention is will be big in conjunction with corresponding feature based on two side-wall pilot tunnel, CD method and benching tunnelling method
Section, extra-large cross-section are divided into 6 left and right sides of Core Soil, 6 region each section of center upper portion Core Soil, while by the first base tunnel of left and right sides
1,2 subdividing polyisocyanate shape step of the second base tunnel expands 6 force area of middle and lower part Core Soil, and right side step and 6 entirety of Core Soil are opened
It digs, is that platform completes the dismounting of 6 region of top Core Soil using molded the second base tunnel of right side 2, it is quick to be gradually completing big cross section
It excavates, a kind of integrated approach of safe excavation.It is to be protected by reasonable 6 trough of Core Soil of determination and subdividing step height
Card construction fast and stable forms big cross section closure, reduces the disturbance to rock mass.Its core is that left side subdividing step promotes, and is established
Transport channel in hole, and interconnection 61 and laterally dismounting top Core Soil 6 are opened up for platform indwelling rock pillar using leading on right side,
Right side middle and lower part Core Soil 6 is integrated with right side middle and lower part base tunnel, increases core stress unit, and divides during middle bench is
It is upper, in get out of a predicament or an embarrassing situation, after scene reaches implementation condition, gradually it is whole excavate in it is upper, in lower Core Soil region and base tunnel；Meet drilling depth
After step pitch, left and right sides can excavate simultaneously, and more work surfaces are unfolded, and greatly improve construction speed, ensure large cross section excavation to greatest extent
Safety connects double side wall through interconnection 61, and forming many places interconnection 61 in hole can effectively solve the problem that construction transportation tissue not
Convenient problem.
Compared with conventional tunnel excavation method, extra-large cross-section bored tunnel of the present invention is reserved median septum step and is torn open
Except tall and big Core Soil excavating load, it can effectively control tall and big Core Soil 6 and remove risk, reduce rock mass disturbance, save various materials
Expect dosage and save the mechanical equipment used time, reduces the mechanical equipment proportion of goods damageds；More former CD, double side wall excavation method, this engineering method
It operates and is easier to realize, section excavation effect is good, and excavation progress is fast and security performance is high.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (4)
1. a kind of method that the tall and big Core Soil of extra-large cross-section bored tunnel is removed, which comprises the steps of:
Step 1: one upper lateral part of Core Soil on top is longitudinally excavated along tunnel to form the first base tunnel, and to the Core Soil on top
Carry out supporting；
First base tunnel is in a horizontal state, and the Core Soil on the top is located at tunnel upper middle position；
Step 2: another upper lateral part of Core Soil on top is longitudinally excavated along tunnel to form the second base tunnel being in a horizontal state, the
The face of two base tunnels is 15m along tunneling direction distance away from the first base tunnel face；
The Core Soil on top is excavated after promoting the first base tunnel and the second base tunnel to excavation direction to be formed perpendicular to the first base tunnel and
The interconnection of second base tunnel；
Step 3: excavating the first base tunnel to form the first step group including several steps, form each step of first step group
Length is 3-5m；
Step 4: laterally the Core Soil on dismounting top is the step tunneling boring of 6m with formation length；
Step 5: excavated downwards below the second base tunnel to form the second step group for including several steps；
Step 6: carrying out Core Soil inverted arch excavation and inverted arch two of constructing serves as a contrast；
Step 7: carrying out the lining construction of tunnel big cross section two.
2. the method that the tall and big core of extra-large cross-section bored tunnel according to claim 1 is removed, which is characterized in that the step
Second base tunnel horizontal width is 8m in 1, and vertical height is 8m.
3. the method that the tall and big core of extra-large cross-section bored tunnel according to claim 1 is removed, which is characterized in that the step
In 2 after second excavation with guide pit, the Core Soil indwelling width on top is 5.6m.
4. the method that the tall and big core of extra-large cross-section bored tunnel according to claim 1 is removed, which is characterized in that the step
Second lower base tunnel and the Core Soil on top divide step is synchronous to excavate in 5, to form the rectangular-shaped step of width 14m height 3m.
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Cited By (2)
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| CN112282782A (en) * | 2020-10-28 | 2021-01-29 | 中铁大桥局集团有限公司 | Method for rapidly discharging slag from anchor hole of large-inclination-angle tunnel of suspension bridge |
| CN113339012A (en) * | 2021-07-07 | 2021-09-03 | 中建八局第二建设有限公司 | Construction method of ultra-wide section tunnel |
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| Publication number | Publication date |
|---|---|
| CN110145314B9 (en) | 2020-11-20 |
| CN110145314B (en) | 2020-07-24 |
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Correction item: Denomination of Invention|Abstract Correct: A method of removing large core soil in large cross section tunnel|Correct False: A method of demolishing large and large nuclear core in large cross section tunnel|error Number: 30-02 Volume: 36 Correction item: Denomination of Invention|Abstract|Claims|Description Correct: A method of removing large core soil in large cross section tunnel|Correct False: A method of demolishing large and large nuclear core in large cross section tunnel|error Number: 30-02 Page: ?? Volume: 36 |