CN107387096A - Large-section loess tunnel three-step middle-pulling groove excavation working surface and construction method thereof - Google Patents
Large-section loess tunnel three-step middle-pulling groove excavation working surface and construction method thereof Download PDFInfo
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- CN107387096A CN107387096A CN201710861433.XA CN201710861433A CN107387096A CN 107387096 A CN107387096 A CN 107387096A CN 201710861433 A CN201710861433 A CN 201710861433A CN 107387096 A CN107387096 A CN 107387096A
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- predicament
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 33
- 238000010276 construction Methods 0.000 title claims abstract description 15
- 239000002689 soil Substances 0.000 claims abstract description 10
- 238000005507 spraying Methods 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 230000002459 sustained effect Effects 0.000 claims description 6
- 241000233633 Phytophthora drechsleri Species 0.000 claims description 3
- 238000007363 ring formation reaction Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a large-section loess tunnel three-step middle-pulling groove excavation working surface and a construction method thereof.A soil body in a tunnel excavation section range is divided into an upper area, a middle area and a lower area to respectively form an upper step, a middle step and a lower step, the upper step is a reserved core soil part, the middle step is grooved in the middle part towards the depth direction to form a middle step grooving area and middle step side walls positioned at two sides of the middle step grooving area, and the overlooking shapes of the top surfaces of the middle step and the middle step side walls positioned at the same height are in a concave shape; the middle part of the lower step is grooved towards the depth direction to form a lower step grooved area and lower step side walls positioned at two sides of the lower step grooved area, the overlooking shape of the top surface of the lower step positioned at the same height and the top surface of the lower step side walls is concave, and the middle step grooved area and the lower step grooved area are used as the mechanical equipment operation area. The invention provides an operation area for large-scale mechanical equipment and can realize mechanized operation.
Description
Technical field
The invention belongs to tunnel excavation excavation work technical field, more particularly to apply the machine in large-section loess tunnel
Tool excavation construction method.
Background technology
The footwork excavation method of three step seven of the prior art is widely used in the excavation driving of loess tunnel, three
The footwork of rank seven refers to tunnel cross-section forming top bar, middle step step by step by three seven footworks and got out of a predicament or an embarrassing situation that its top bar is pre-
Core Soil part is stayed, formation and the contour top bar highwall of middle step top surface in the both sides of top bar, middle step top surface is with appearing on the stage
Rank highwall top surface plan view shape is rendered as " convex " shape, is formed in the both sides of middle step and the contour middle step side of top surface of getting out of a predicament or an embarrassing situation
Side, top surface of getting out of a predicament or an embarrassing situation is same with middle step highwall top surface plan view shape to be rendered as " convex " shape；Due to depositing for middle part layering shape step
So that plant equipment can not directly be goed deep into, it is difficult to effective operation is formed on step, constructing tunnel is significantly limit and enters
Degree.
The content of the invention
The present invention is to avoid the weak point present in above-mentioned prior art, there is provided a kind of large-section loess tunnel three
Rank draws bracket groove to excavate the scope of operation and construction method so that and plant equipment more directly can be excavated deeply in the scope of operation, so as to
Effective operation is formed on step, improves tunnel excavation construction speed.
The present invention adopts the following technical scheme that to solve technical problem：
The step of large-section loess tunnel three of the present invention draws bracket groove to excavate the scope of operation, is formed with three on the scope of operation is excavated
Rank is top bar, middle step respectively and is got out of a predicament or an embarrassing situation, and is characterized in：
The top bar is remaining core soil in advance part；
The middle step is slotted at middle part towards depth direction, step slotted zones and positioned at middle step slotted zones in formation
The middle step highwall of both sides, the middle step top surface being on sustained height are rendered as " recessed " with middle step highwall top surface plan view shape
Font；
Described get out of a predicament or an embarrassing situation is slotted at middle part towards depth direction, and formation is got out of a predicament or an embarrassing situation slotted zones and positioned at slotted zones of getting out of a predicament or an embarrassing situation
The highwall of getting out of a predicament or an embarrassing situation of both sides, the top surface of getting out of a predicament or an embarrassing situation being on sustained height are rendered as " recessed " with highwall top surface plan view shape of getting out of a predicament or an embarrassing situation
Font, plant equipment operation area is used as using middle step slotted zones and slotted zones of getting out of a predicament or an embarrassing situation.
The step of large-section loess tunnel three of the present invention draws bracket groove to excavate the scope of operation, and its feature is lain also in：To be got out of a predicament or an embarrassing situation end face
It is arranged to slope so that step slotted zones during the plant equipment being in slotted zones of getting out of a predicament or an embarrassing situation can be entered by slope.
The characteristics of step of large-section loess tunnel three of the present invention draws bracket groove to excavate the construction method of the scope of operation is by following step
It is rapid to carry out：
Step 1, top bar remaining core soil in advance is excavated, longitudinal cutting depth is that the top bar driving of a P. drechsleri is deep
Degree；Ring Cutting then is carried out in both sides and top area, forms the top bar of this driving；
Step 2, excavate in step slotted zones, then intersect excavation in step highwall, formed this driving middle step and in
Step highwall；
Step 3, excavation are got out of a predicament or an embarrassing situation slotted zones, then are intersected excavation and got out of a predicament or an embarrassing situation highwall, formed this driving get out of a predicament or an embarrassing situation and under
Step highwall；
Step 4, inverted arch is excavated, complete this driving.
The characteristics of step of large-section loess tunnel three of the present invention draws bracket groove to excavate the construction method of the scope of operation lies also in：
For the operation of step 1, it is that excavator is placed in middle step slotted zones, the dregs dug down is encased inside and opened in middle step
In groove area；After the excavation of this driving top bar is completed, vertical top bar steelframe is propped up, afterwards into step 2；
While being excavated by step 2, operation of slagging tap is carried out with loading machine；Complete the middle platform of this driving
After the excavation that rank and middle step side are tied up, Zhi Lizhong step steelframes, afterwards into step 3；
Operation of slagging tap is carried out while being excavated by step 3, completes the side of getting out of a predicament or an embarrassing situation and get out of a predicament or an embarrassing situation of this driving
After the excavation of side, wet-spraying machine is seated in slotted zones of getting out of a predicament or an embarrassing situation, and concrete spraying support is carried out to top bar；Then branch is made
Step steelframe, then step and got out of a predicament or an embarrassing situation in wet-spraying support, afterwards into step 4；
After inverted arch is completed by step 4 and is excavated, implement supporting immediately, make inverted arch closing cyclization.
Compared with the prior art, the present invention has the beneficial effect that：
1st, the present invention is will to pull out bracket groove in the middle part of the footwork of three step seven in advance, step slotted zones and is got out of a predicament or an embarrassing situation in being formed respectively
Slotted zones, are large scale equipment, and such as excavator, wet-spraying machine provide operating radius in slotted zones, reach do mechanization operation purpose, energy
Construction speed is greatly enhanced, reduces engineering cost；
2nd, tunnel is vertically divided into three layers of step by the present invention, top bar remaining core soil in advance post support face, effectively prevents
Face unstability, by middle step and get out of a predicament or an embarrassing situation it is vertical among earth pillar excavate, earth pillar highwall is reserved in both sides, can be effectively ensured arch springing by
Power area and prevent steelframe stress inward displacement；
3rd, the inventive method realizes top bar, middle step and shaping of getting out of a predicament or an embarrassing situation, slags tap and once completed with supporting, and process is closed
Manage compact, guarantee construction quality.
4th, present invention is particularly suitable for IV grade and the V grade of country rock large-section loess tunnel that foundation bearing capacity is more than 250kPa
Construction, reach 100m suitable for excavated section product2Q2 arenaceous stratums or Q2 and Q3 clayey Loess Layers above.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention；
Fig. 2 is tunnel excavation sectional schematic diagram in the present invention；
Fig. 3 draws bracket groove excavation face schematic top plan view for three steps in the present invention；
Label in figure：1 top bar, step in 2, step slotted zones in 2a, step highwall in 2b, 3 get out of a predicament or an embarrassing situation, and 3a gets out of a predicament or an embarrassing situation
Slotted zones, 3b get out of a predicament or an embarrassing situation highwall, 4 slopes, 5 inverted arch trestles, 6 inverted arch.
Embodiment
Referring to Fig. 1, Fig. 2 and Fig. 3, the step of large-section loess tunnel three draws bracket groove to excavate the scope of operation in the present embodiment, be
Excavate in the scope of operation formed with three steps, be top bar, middle step respectively and get out of a predicament or an embarrassing situation.
Top bar 1 is remaining core soil in advance part.
Middle step 2 is slotted at middle part towards depth direction, step slotted zones 2a and positioned at middle step slotted zones in formation
The middle step highwall 2b of 2a both sides, the middle step top surface being on sustained height are rendered as with middle step highwall top surface plan view shape
Concave.
Get out of a predicament or an embarrassing situation and 3 slotted at middle part towards depth direction, formation is got out of a predicament or an embarrassing situation slotted zones 3a and positioned at slotted zones of getting out of a predicament or an embarrassing situation
The highwall 3b that gets out of a predicament or an embarrassing situation of 3a both sides, the top surface of getting out of a predicament or an embarrassing situation being on sustained height are rendered as with highwall top surface plan view shape of getting out of a predicament or an embarrassing situation
Concave, plant equipment operation area is used as using middle step slotted zones 2a and the slotted zones 3a that gets out of a predicament or an embarrassing situation.
In specific implementation, the end face that will get out of a predicament or an embarrassing situation is arranged to slope 3c so that the machinery being in the slotted zones 3a that gets out of a predicament or an embarrassing situation
Step slotted zones 2a during equipment can be entered by slope 3c.
It is as follows that the step of large-section loess tunnel three, which draws the construction method of the bracket groove excavation scope of operation, in the present embodiment
Carry out：
Step 1, top bar remaining core soil in advance is excavated, longitudinal cutting depth is that the top bar driving of a P. drechsleri is deep
Degree；Ring Cutting then is carried out in both sides and top area, forms the top bar 1 of this driving, it is 1-2 to control top bar drilling depth
Top bar steelframe distance.
Step slotted zones 2a in step 2, excavation, then intersect step highwall 2b in excavation, form the middle step 2 of this driving
And middle step highwall 2b, step drilling depth is step steelframe distance in 2-3 in controlling.
Step 3, excavation are got out of a predicament or an embarrassing situation slotted zones 3a, then are intersected excavation and got out of a predicament or an embarrassing situation highwall 3b, and form this driving gets out of a predicament or an embarrassing situation 3
And the highwall 3b that gets out of a predicament or an embarrassing situation, control drilling depth of getting out of a predicament or an embarrassing situation to be got out of a predicament or an embarrassing situation steelframe distance for 2-3.
Step 4, inverted arch trestle 5 is built, excavate inverted arch 6, complete this driving.
In Specific construction：
For the operation of step 1, it is that excavator is placed in middle step slotted zones, the dregs dug down is encased inside and opened in middle step
In groove area；After the excavation of this driving top bar is completed, vertical top bar steelframe is propped up, afterwards into step 2；
While being excavated by step 2, operation of slagging tap is carried out with loading machine；Complete the middle platform of this driving
After the excavation that rank and middle step side are tied up, Zhi Lizhong step steelframes, afterwards into step 3；
Operation of slagging tap is carried out while being excavated by step 3, completes the side of getting out of a predicament or an embarrassing situation and get out of a predicament or an embarrassing situation of this driving
After the excavation of side, wet-spraying machine is seated in slotted zones of getting out of a predicament or an embarrassing situation, and concrete spraying support is carried out to top bar；Then branch is made
Step steelframe, then step and got out of a predicament or an embarrassing situation in wet-spraying support, afterwards into step 4；
After the excavation of inverted arch 6 is completed by step 4, implement inverted arch supporting and inverted arch secondary lining immediately, close inverted arch
Cyclization.
Claims (4)
- It is formed with three steps, difference on the scope of operation is excavated 1. the step of large-section loess tunnel three draws bracket groove to excavate the scope of operation It is top bar (1), middle step (2) and gets out of a predicament or an embarrassing situation (3), it is characterized in that：The top bar (1) is remaining core soil in advance part；The middle step (2) is slotted at middle part towards depth direction, step slotted zones (2a) and is opened in formation positioned at middle step The middle step highwall (2b) of groove area both sides, the middle step top surface being on sustained height are in middle step highwall top surface plan view shape It is now concave；Get out of a predicament or an embarrassing situation (3) are slotted at middle part towards depth direction, and formation is got out of a predicament or an embarrassing situation slotted zones (3a) and positioned at getting out of a predicament or an embarrassing situation out The highwall of getting out of a predicament or an embarrassing situation (3b) of groove area both sides, the top surface of getting out of a predicament or an embarrassing situation being on sustained height are in highwall top surface plan view shape of getting out of a predicament or an embarrassing situation It is now concave, plant equipment operation area is used as using middle step slotted zones (2a) and slotted zones of getting out of a predicament or an embarrassing situation (3a).
- 2. the step of large-section loess tunnel three according to claim 1 draws bracket groove to excavate the scope of operation, it is characterized in that：It will leave office The end face of rank (3) is arranged to slope (4) so that the plant equipment being in slotted zones of getting out of a predicament or an embarrassing situation (3a) can pass through slope (4) step slotted zones (2a) in entering.
- 3. the step of large-section loess tunnel three described in a kind of claim 1 draws bracket groove to excavate the construction method of the scope of operation, it is special Sign is to carry out as follows：Step 1, top bar remaining core soil in advance is excavated, longitudinal cutting depth is the top bar tunnelling footage of a P. drechsleri；With Ring Cutting is carried out in both sides and top area afterwards, forms the top bar (1) of this driving；Step slotted zones (2a) in step 2, excavation, then intersect step highwall (2b) in excavation, form the middle step of this driving And middle step highwall (2b) (2)；Step 3, excavation are got out of a predicament or an embarrassing situation slotted zones (3a), then are intersected excavation and got out of a predicament or an embarrassing situation highwall (3b), form getting out of a predicament or an embarrassing situation for this driving And highwall of getting out of a predicament or an embarrassing situation (3b) (3)；Step 4, inverted arch (6) is excavated, complete this driving.
- 4. the step of large-section loess tunnel three according to claim 3 draws bracket groove to excavate the construction method of the scope of operation, it is special Sign is：For the operation of step 1, it is that excavator is placed in middle step slotted zones (2a), the dregs dug down is encased inside and opened in middle step In groove area；After the excavation of this driving top bar is completed, vertical top bar steelframe is propped up, afterwards into step 2；While being excavated by step 2, operation of slagging tap is carried out with loading machine；Complete this driving middle step and After the excavation that middle step side is tied up, Zhi Lizhong step steelframes, afterwards into step 3；Operation of slagging tap is carried out while being excavated by step 3, completes the highwall of getting out of a predicament or an embarrassing situation and get out of a predicament or an embarrassing situation of this driving After excavation, wet-spraying machine is seated in slotted zones of getting out of a predicament or an embarrassing situation (3a), and concrete spraying support is carried out to top bar；Then branch is made Step steelframe, then step and got out of a predicament or an embarrassing situation in wet-spraying support, afterwards into step 4；After inverted arch is completed by step 4 and is excavated, implement supporting immediately, make inverted arch closing cyclization.
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Cited By (6)
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|---|---|---|---|---|
| CN108301841A (en) * | 2018-02-08 | 2018-07-20 | 中建隧道建设有限公司 | The construction of advanced reserved side soil is led in highway large cross-section tunnel |
| CN108397202A (en) * | 2018-03-06 | 2018-08-14 | 中交第二公路勘察设计研究院有限公司 | Freeze the leading excavation method of base tunnel in multi-step under advance support |
| CN108397205A (en) * | 2018-03-05 | 2018-08-14 | 北京市政建设集团有限责任公司 | A kind of shield well transverse passage-way CRD method construction methods |
| CN108756894A (en) * | 2018-04-23 | 2018-11-06 | 中铁二十五局集团第工程有限公司 | Tunnel micro- three step top Core Soil construction |
| CN109854254A (en) * | 2019-04-11 | 2019-06-07 | 中铁八局集团第三工程有限公司 | A kind of neighbouring high-speed rail two-wire large cross-section tunnel cantilever excavator construction technology |
| CN110006300A (en) * | 2019-04-26 | 2019-07-12 | 中建三局第三建设工程有限责任公司 | A kind of method of soft rock, high inclination-angle tunnel anchorage digital primer Blasting Excavation |
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| CN109854254B (en) * | 2019-04-11 | 2021-02-05 | 中铁八局集团第三工程有限公司 | Construction process of cantilever tunneling machine adjacent to high-speed rail double-line large-section tunnel |
| CN110006300A (en) * | 2019-04-26 | 2019-07-12 | 中建三局第三建设工程有限责任公司 | A kind of method of soft rock, high inclination-angle tunnel anchorage digital primer Blasting Excavation |
| CN110006300B (en) * | 2019-04-26 | 2021-09-14 | 中建三局第三建设工程有限责任公司 | Blasting excavation method for soft rock and large-inclination-angle tunnel anchor digital detonator |
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