CN110017149A - A kind of ledge tunneling is suitable to build underground structure and construction method - Google Patents
A kind of ledge tunneling is suitable to build underground structure and construction method Download PDFInfo
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- CN110017149A CN110017149A CN201910423686.8A CN201910423686A CN110017149A CN 110017149 A CN110017149 A CN 110017149A CN 201910423686 A CN201910423686 A CN 201910423686A CN 110017149 A CN110017149 A CN 110017149A
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- 238000010276 construction Methods 0.000 title claims abstract description 91
- 230000005641 tunneling Effects 0.000 title claims abstract description 39
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 38
- 239000010959 steel Substances 0.000 claims abstract description 38
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 238000007596 consolidation process Methods 0.000 claims abstract description 3
- 238000009412 basement excavation Methods 0.000 claims description 30
- 238000007569 slipcasting Methods 0.000 claims description 9
- 239000002689 soil Substances 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 5
- 210000003205 muscle Anatomy 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 34
- 230000008901 benefit Effects 0.000 abstract description 6
- 235000010627 Phaseolus vulgaris Nutrition 0.000 abstract description 4
- 244000046052 Phaseolus vulgaris Species 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- 239000011435 rock Substances 0.000 description 11
- 238000012407 engineering method Methods 0.000 description 6
- 238000005422 blasting Methods 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
-
- 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- 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
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- Mining & Mineral Resources (AREA)
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- Architecture (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The present invention provides a kind of ledge tunnelings along building underground structure and construction method, belongs to underground structure and builds technical field, including middle drift, side pilot tunnel, ledge, skirt piles and positioned at the bed course of bottom；Ledge, middle drift of the ledge across two side pilot tunnels are set between two side pilot tunnels；Skirt piles are extended downwardly from side pilot tunnel, and the one end of skirt piles far from side pilot tunnel and bed course are fixedly installed；Inverted arch is provided on bed course；Skirt piles are connect by anchor cable with stratum consolidation.The present invention can both evade the operations such as transport processing, positioning measurement, lifting fixation of the cavern-pile method steel pipe column in narrow pilot tunnel completely, difficulty of construction is big, operating environment is poor, positioning accuracy and difference settlement control require the construction difficult problem that high, bean column node construction is complicated, construction space is narrow, speed of application is slow, difficulty of construction is big under plate, the advantages of ledge method arch can be evaded again and excavate the disadvantage for causing stratum settlement big using two side-wall pilot tunnel, while integrating cavern-pile method and ledge method.
Description
Technical field
The present invention relates to underground structures to build technical field, builds underground structure in particular to a kind of ledge tunneling is suitable
And construction method.
Background technique
PBA engineering method is one the characteristics of combining cap excavation method on the basis of traditional shallow buried covered excavation partial excavation method and formed
Kind construction method, the core concept of the engineering method are to try to be formed to be collectively formed by skirt piles, middle stake (column), top bottom beam, ledge
Integer support system bears the load of work progress, and ultimately forms forever under the protection of top cover along two lining structures of work or inverse work
Carrying system long.PBA engineering method is one kind of the dark method method of shallow embedding, Underground Subway Station is used for, when features as poor geologic condition, section are larger
When, it is generally configured to multispan structure, across connecting with having beam, column across between.
Ledge method is that upper soft lower hard, decayed rock stratum a kind of tunneling that is suitable for created on the basis of PBA engineering method is applied
Work method.The core concept of this method is to make full use of down the bearing capacity and stability of covering country rock, in not explosion or weak blast
Under conditions of, just branch button arch construction is carried out using the small pilot tunnel form of PBA engineering method, while PBA work is replaced using big arch springing scheme
Arch is just propped up and is supported on the stable basement rock in two sides with two lining structures, forms ledge by the skirt piles in method；Under the protection of ledge,
Carry out that underground cover and cut is inverse to be made or along constructing.Ledge method can be good at cracking soft lower hard difficulty on the stratum that subway engineering faces
Topic, is very suitable to decayed rock stratum shallow buried covered excavation greatly across the construction of subway station.
Compared to other engineering methods such as PBA, ledge method pilot tunnel is few, process is few, disturbance less, surface subsidence it is small, supporting is simple, discarded
Project amount is small, without skirt piles, without temporary support, low cost, after ledge is formed, can large area operation, high-efficient, short time limit.
But ledge method requires height to Surrounding Rock Strength, is only applicable to decayed rock stratum, especially upper soft lower hard native rock compound stratum；?
In upper-soft lower-hard ground, ledge arch springing, which need to be located at, stablizes basement rock, and station buried depth is limited；Arch springing lower side wall position Blasting Excavation is to arch
The protection of foot is more difficult to control.Arch causes stratum settlement big using two side-wall pilot tunnel excavation.
Summary of the invention
The present invention provides a kind of ledge tunnelings along building underground structure and construction method, it is intended to solve ledge in the prior art
Tunneling is suitable to build the above problem existing for underground structure and construction method.
The present invention is implemented as follows:
A kind of ledge tunneling is along building underground structure, including middle drift, side pilot tunnel, ledge, skirt piles and positioned at the bed course of bottom；
The ledge is set between two side pilot tunnels, and the ledge is in described across two side pilot tunnels
Pilot tunnel；
The skirt piles are extended downwardly from the side pilot tunnel, and the one end of the skirt piles far from the side pilot tunnel and the bed course are solid
Fixed setting；
Inverted arch is provided on the bed course；
The skirt piles are connect by anchor cable with stratum consolidation.
In an embodiment of the present invention, construction space is formed between corresponding two skirt piles；
The construction space is provided with side wall close to the side of the skirt piles, and middle plate is provided between side wall described in two sides,
The middle plate is fixedly connected with the side wall of two sides respectively.
In an embodiment of the present invention, it is additionally provided between the middle plate and the inverted arch and is used to support the middle plate
Center pillar.
In an embodiment of the present invention, arch steel tube shed is provided with above the ledge.
A kind of suitable construction method for building underground structure of ledge tunneling, is tied for building above-mentioned ledge tunneling along underground is built
Structure, comprising steps of
A. the top bar of the middle drift as described in transverse passage-way excavation construction, in construction, the backfill slip casting in time behind of first branch is gone forward side by side
Row the Real-Time Measuring, the middle drift is rear to the end to carry out faces end head plugging in time；
B. arch steel tube shed is laterally set to two sides in the middle drift；
C. under the arch steel tube shed supporting, the side pilot tunnel as described in transverse passage-way excavation construction, in construction, first branch behind and
When backfill slip casting, and carry out the Real-Time Measuring, pilot tunnel carries out faces end head plugging afterwards to the end；
D. the construction of the skirt piles is carried out down in the side pilot tunnel；
E. the stake top crown beam of skirt piles described in in-cavity construction is led on the side；
F. as described in transverse passage-way excavation construction middle drift is got out of a predicament or an embarrassing situation, in construction, the first branch note of pilot tunnel backfill in time behind
Slurry, and the Real-Time Measuring is carried out, the middle drift is rear to the end to carry out faces end head plugging in time；
G. it constructs in the middle drift ledge；
H. under the arch steel tube shed supporting, the arch residue soil body is excavated, in construction, first branch backfill note in time behind
Slurry, and carry out the Real-Time Measuring；
I. the grid steel frame for removing the side pilot tunnel and the middle drift, two linings of the ledge of constructing, to the ledge
Concrete reach the scaffold removed after design strength in the middle drift；
J. below step excavation to the anchor cable, steel waist rail and the anchor cable are applied, continues to dig to substrate；
K. entirely mould, fertile slot backfill are laid with the bed course, pour inverted arch structure；
L. fertile slot backfill, is laid with waterproof layer from bottom to top, pours the side wall, the center pillar and the middle plate, main body knot
Structure closing.
In an embodiment of the present invention, in the step A:
The arch steel tube shed, ductule are set before middle drift excavation, or by deep hole grouting advance reinforcement
Layer, and bracing means is increased to the transverse passage-way in cut into hole region.
In an embodiment of the present invention, in the step C:
The first branch of the side pilot tunnel is welded and fixed with the arch steel tube shed.
In an embodiment of the present invention, in the step G:
Two lined steel muscle of ledge is reserved for the ledge to plug into, and retains scaffold system until the ledge forms complete stress
Structure.
In an embodiment of the present invention, in the step I:
The grid steel frame longitudinally removes length and is not more than 6m.
In an embodiment of the present invention, in the step J:
During digging substrate, mechanical excavation to the position of the above 300mm of bed course, remaining is using manually excavating, with opening
Net spray supporting between excavation construction stake.
Add the beneficial effects of the present invention are: the present invention can both evade transport of the cavern-pile method steel pipe column in narrow pilot tunnel completely
Work, positioning measurement lift the operations such as fixed, and difficulty of construction is big, and operating environment is poor, positioning accuracy and difference settlement control requirement
Construction difficult problem high, bean column node construction is complicated, construction space is narrow, speed of application is slow, difficulty of construction is big under plate, and can evade
Ledge method arch excavates the disadvantage for causing stratum settlement big using two side-wall pilot tunnel, while the advantages of collect cavern-pile method and ledge method
, major advantage has:
1) it being excavated under lateral arch steel tube shed support system using small pilot tunnel form, Vault settlement and stratum settlement are small,
Construction risk is small.
2) pilot tunnel is few, and process is few, and disturbance number is few.
3) supporting is simple, and first branch is removed less, and abandoned project amount is small.
4) it is served as a contrast by ledge two and load above vault is transmitted to skirt piles, be conducive to control Vault settlement and surface subsidence.
5) after ledge is formed, can large area operation, it is high-efficient, the duration shorten.
6) stratum is applied widely, is not only suitable for soft soil layer, and is applicable to soft lower hard compound stratum, is also applicable to
In rock stratum.
7) ledge arch springing, which is not necessarily to be located at, stablizes basement rock, and structure buried depth is unrestricted.
8) when using Blasting Excavation, arch springing lower side wall position Blasting Excavation is smaller to the stability influence of arch springing, safety
It is higher.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of embodiment of the present invention
Attached drawing be briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not to be seen as
It is the restriction to range, it for those of ordinary skill in the art, without creative efforts, can be with root
Other relevant attached drawings are obtained according to these attached drawings.
Fig. 1 is the suitable cross-sectional view for building underground structure of ledge tunneling that embodiment of the present invention provides；
Fig. 2, which is that the ledge tunneling of embodiment of the present invention offer is suitable, builds the construction method of underground structure after step
Cross-sectional view；
Fig. 3, which is that the ledge tunneling of embodiment of the present invention offer is suitable, builds the construction method of underground structure after stepb
Cross-sectional view；
Fig. 4, which is that the ledge tunneling of embodiment of the present invention offer is suitable, builds the construction method of underground structure after step c
Cross-sectional view；
Fig. 5, which is that the ledge tunneling of embodiment of the present invention offer is suitable, builds the construction method of underground structure after step D
Cross-sectional view；
Fig. 6, which is that the ledge tunneling of embodiment of the present invention offer is suitable, builds the construction method of underground structure after step E
Cross-sectional view；
Fig. 7, which is that the ledge tunneling of embodiment of the present invention offer is suitable, builds the construction method of underground structure after step F
Cross-sectional view；
Fig. 8, which is that the ledge tunneling of embodiment of the present invention offer is suitable, builds the construction method of underground structure after step G
Cross-sectional view；
Fig. 9, which is that the ledge tunneling of embodiment of the present invention offer is suitable, builds the construction method of underground structure after step H
Cross-sectional view；
Figure 10, which is that the ledge tunneling of embodiment of the present invention offer is suitable, builds the construction method of underground structure after step I
Cross-sectional view；
Figure 11, which is that the ledge tunneling of embodiment of the present invention offer is suitable, builds the construction method of underground structure after stagej
Cross-sectional view；
Figure 12, which is that the ledge tunneling of embodiment of the present invention offer is suitable, builds the construction method of underground structure after step K
Cross-sectional view；
Figure 13, which is that the ledge tunneling of embodiment of the present invention offer is suitable, builds the construction method of underground structure after step L
Cross-sectional view.
Icon: 1- middle drift；The side 2- pilot tunnel；3- steel tube shed；4- ledge；5- advance support；6- crown beam；7- anchor cable；8- fertilizer
Slot backfill；9- bed course；10- inverted arch；11- center pillar；12- side wall；Plate in 13-；14- skirt piles；15- steel waist rail；16- scaffold.
Specific embodiment
To keep the purposes, technical schemes and advantages of embodiment of the present invention clearer, implement below in conjunction with the present invention
The technical solution in embodiment of the present invention is clearly and completely described in attached drawing in mode, it is clear that described reality
The mode of applying is some embodiments of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ability
Domain those of ordinary skill every other embodiment obtained without creative efforts, belongs to the present invention
The range of protection.Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit below and is wanted
The scope of the present invention of protection is sought, but is merely representative of selected embodiment of the invention.Based on the embodiment in the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts belongs to this
Invent the range of protection.
In the description of the present invention, it is to be understood that, indicating position or the term of positional relationship are based on shown in attached drawing
Orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, rather than the equipment of indication or suggestion meaning
Or element must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be direct phase
Even, can also indirectly connected through an intermediary, the interaction that can be connection or two elements inside two elements is closed
System.For the ordinary skill in the art, above-mentioned term in the present invention specific can be understood as the case may be
Meaning.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be on or below second feature
Directly contacted including the first and second features, also may include the first and second features be not direct contact but by them it
Between other characterisation contact.Moreover, fisrt feature is on second feature, top and above include fisrt feature second spy
Right above sign and oblique upper, or first feature horizontal height is merely representative of higher than second feature.Fisrt feature second feature it
Under, lower section and fisrt feature included below be directly below and diagonally below the second feature, or be merely representative of first feature horizontal height
Less than second feature.
Embodiment one
A kind of ledge tunneling is present embodiments provided along building underground structure, referring to Fig. 1, this ledge tunneling is along building underground
Structure includes middle drift 1, side pilot tunnel 2, ledge 4, skirt piles 14 and the bed course 9 positioned at bottom；
It is provided with arch steel tube shed 3 above ledge 4, ledge 4 is set between two side pilot tunnels 2, ledge 4 passes through two sides and leads
Middle drift 1 between hole 2；
Skirt piles 14 are extended downwardly from side pilot tunnel 2, and the skirt piles 14 positioned at same one side are vertical to be connected upwardly through stake top crown beam 6, side
Stake 14 one end and bed course 9 far from side pilot tunnel 2 are fixedly installed；Inverted arch 10 is provided on bed course 9；Skirt piles 14 pass through anchor cable 7 and ground
Layer reinforces connection.
Construction space is formed between corresponding two skirt piles 14, construction space is provided with side wall close to the side of skirt piles 14
12, middle plate 13 is provided between two sides side wall 12, and middle plate 13 is fixedly connected with the side wall 12 of two sides respectively.Middle plate 13 and inverted arch 10
Between be additionally provided with the center pillar 11 for being used to support middle plate 13.
It is solid that the present invention can both evade transport processing, positioning measurement, lifting of the cavern-pile method steel pipe column in narrow pilot tunnel completely
Surely equal operations, difficulty of construction is big, and operating environment is poor, positioning accuracy and difference settlement control requirement are high, bean column node construction is complicated,
The construction difficult problem that construction space is narrow under plate, speed of application is slow, difficulty of construction is big, and ledge method arch can be evaded using double side wall
Pilot tunnel method excavates the disadvantage for causing stratum settlement big.
Embodiment two
A kind of ledge tunneling is present embodiments provided along building the construction method of underground structure for building the offer of embodiment one
Ledge tunneling along building underground structure, this ledge tunneling along the construction method for building underground structure comprising steps of
A. using benching tunnelling method construction middle drift 1, by the top bar of transverse passage-way excavation construction middle drift 1, before middle drift 1 excavates
Should set steel tube shed 3, ductule or by way of deep hole grouting advance reinforcement stratum provide advance support 5, and to cut into
The transverse passage-way in hole region increases necessary reinforcement measure.In construction, the backfill slip casting in time behind of first branch, and carry out real time monitoring amount
It surveys, pilot tunnel is rear to the end to carry out faces end head plugging in time, please refers to Fig. 2.
B. arch steel tube shed 3 is laterally set to two sides in middle drift 1, please refers to Fig. 3.
C. under lateral 3 supporting of arch steel tube shed, by transverse passage-way excavation construction side pilot tunnel 2, in construction, first branch behind and
When backfill slip casting, and carry out the Real-Time Measuring, pilot tunnel to the end after carry out faces end head plugging in time, pilot tunnel just props up laterally big with arch
Pipe canopy 3 welds and guarantees quality of connection, please refers to Fig. 4.
D. carried out down in side pilot tunnel 2 skirt piles 14 construction, skirt piles 14 can for cast-in-situ bored pile, manually digging hole filling pile and
Steel-pipe pile please refers to Fig. 5.
E. construction stake apical cap beam 6, ledge 4 and waterproof layer in side pilot tunnel 2, reserved 4 two lined steel muscle of ledge are plugged into, waterproof layer
It is reserved to connect stranding, please refer to Fig. 6.
F. getting out of a predicament or an embarrassing situation by transverse passage-way excavation construction middle drift 1, in construction, the backfill slip casting in time behind of first branch, and carry out
The Real-Time Measuring, pilot tunnel is rear to the end to carry out faces end head plugging in time, please refers to Fig. 7.
G. construction ledge 4 and waterproof layer in middle drift 1, reserved 4 two lined steel muscle of ledge are plugged into, and waterproof layer is reserved to connect stranding,
Reservation 16 system of scaffold forms complete force structure up to ledge 4, please refers to Fig. 8.
H. under lateral 3 supporting of arch steel tube shed, the arch residue soil body, construction are excavated using benching tunnelling method by transverse passage-way
In, the backfill slip casting in time behind of first branch, and the Real-Time Measuring is carried out, pilot tunnel is rear to the end to carry out faces end head plugging in time, please refers to
Fig. 9.
I. side pilot tunnel 2 and 1 grid steel frame of middle drift, the lining of constructed residual ledge 4 two and waterproof layer, pilot tunnel grid steel frame are removed
Longitudinal length of removing should be not more than 6m according to monitoring measurement strict control.In being removed after 4 concrete of ledge reaches design strength
Scaffold 16, please refers to Figure 10 in pilot tunnel 1.
J. step excavation applies steel waist rail 15 and anchor cable 7, prestressed anchor can be used in anchor cable 7 to 7 lower section 0.5m of anchor cable in time
Rope 7 and anchor pole continue to dig to substrate.To avoid the relatively large disturbances to hole subsoil, mechanical excavation can only be dug to 9 or more bed course
The position 300mm, remaining, which is used, manually excavates；With net spray supporting between excavation construction stake, Figure 11 is please referred to.
K. entirely mould, fertile slot backfill 8 are laid with bed course 9 and waterproof layer, pour 10 structure of inverted arch, please refer to Figure 12.
L. fertile slot backfill 8, is laid with waterproof layer from bottom to top, pours side wall 12, center pillar 11 and middle plate 13, main structure envelope
It closes.Side wall 12 under ledge 4 first pour with after pour position connector using funnel casting method construct, by pour pressure and vibrating spear vibration
Smash concreting is closely knit, at construction joint use one of Grouting Pipe, twice hydroexpansivity polyurethane water-stop glue and construction joint table
Face brushing cement-based capillary crystalline waterproof coating, please refers to Figure 13.
It is solid that the present invention can both evade transport processing, positioning measurement, lifting of the cavern-pile method steel pipe column in narrow pilot tunnel completely
Surely equal operations, difficulty of construction is big, and operating environment is poor, positioning accuracy and difference settlement control requirement are high, bean column node construction is complicated,
The construction difficult problem that construction space is narrow under plate, speed of application is slow, difficulty of construction is big, and ledge method arch can be evaded using double side wall
Pilot tunnel method excavates the disadvantage for causing stratum settlement big, while the advantages of integrate cavern-pile method and ledge method, major advantage has:
1) it being excavated under lateral 3 support system of arch steel tube shed using small pilot tunnel form, Vault settlement and stratum settlement are small,
Construction risk is small.
2) pilot tunnel is few, and process is few, and disturbance number is few.
3) supporting is simple, and first branch is removed less, and abandoned project amount is small.
4) it is served as a contrast by ledge 4 two and load above vault is transmitted to skirt piles 14, be conducive to control Vault settlement and ground is heavy
Drop.
5) ledge 4 formed after, can large area operation, it is high-efficient, the duration shorten.
6) stratum is applied widely, is not only suitable for soft soil layer, and is applicable to soft lower hard compound stratum, is also applicable to
In rock stratum.
7) 4 arch springing of ledge, which is not necessarily to be located at, stablizes basement rock, and structure buried depth is unrestricted.
8) when using Blasting Excavation, 12 position Blasting Excavation of arch springing lower side wall is smaller to the stability influence of arch springing, safety
Property is higher.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for this field
For technical staff, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of ledge tunneling is suitable to build underground structure, which is characterized in that including middle drift, side pilot tunnel, ledge, skirt piles and be located at bottom
The bed course in portion；
The ledge is set between two side pilot tunnels, and the ledge is led in described across two side pilot tunnels
Hole；
The skirt piles are extended downwardly from the side pilot tunnel, and the one end of the skirt piles far from the side pilot tunnel is set with bed course fixation
It sets；
Inverted arch is provided on the bed course；
The skirt piles are connect by anchor cable with stratum consolidation.
2. ledge tunneling according to claim 1 is along building underground structure, which is characterized in that corresponding two skirt piles it
Between form construction space；
The construction space is provided with side wall close to the side of the skirt piles, and middle plate is provided between side wall described in two sides, described
Middle plate is fixedly connected with the side wall of two sides respectively.
3. ledge tunneling according to claim 2 is along building underground structure, which is characterized in that the middle plate and the inverted arch it
Between be additionally provided with the center pillar for being used to support the middle plate.
4. ledge tunneling according to claim 3 is suitable to build underground structure, which is characterized in that be provided with arch above the ledge
Portion's steel tube shed.
5. a kind of ledge tunneling is along the construction method for building underground structure, which is characterized in that as claimed in claim 4 for building
Ledge tunneling is suitable to build underground structure, comprising steps of
A. the top bar of the middle drift as described in transverse passage-way excavation construction, in construction, the backfill slip casting in time behind of first branch, and carry out reality
When monitoring measurement, the middle drift to the end after in time carry out faces end head plugging；
B. arch steel tube shed is laterally set to two sides in the middle drift；
C. under the arch steel tube shed supporting, the side pilot tunnel as described in transverse passage-way excavation construction, in construction, first branch is returned in time behind
Slurry is filled in, and carries out the Real-Time Measuring, pilot tunnel carries out faces end head plugging afterwards to the end；
D. the construction of the skirt piles is carried out down in the side pilot tunnel；
E. the stake top crown beam of skirt piles described in in-cavity construction is led on the side；
F. the middle drift as described in transverse passage-way excavation construction is got out of a predicament or an embarrassing situation, in construction, the backfill slip casting in time behind of first branch, and carry out
The Real-Time Measuring, the middle drift is rear to the end to carry out faces end head plugging in time；
G. it constructs in the middle drift ledge；
H. under the arch steel tube shed supporting, the arch residue soil body is excavated, in construction, the backfill slip casting in time behind of first branch, and
Carry out the Real-Time Measuring；
I. the grid steel frame for removing the side pilot tunnel and the middle drift, two linings of the ledge of constructing, to the mixed of the ledge
Solidifying soil reaches the scaffold removed after design strength in the middle drift；
J. below step excavation to the anchor cable, steel waist rail and the anchor cable are applied, continues to dig to substrate；
K. entirely mould, fertile slot backfill are laid with the bed course, pour inverted arch structure；
L. fertile slot backfill, is laid with waterproof layer from bottom to top, pours the side wall, the center pillar and the middle plate, main structure envelope
It closes.
6. ledge tunneling according to claim 5 is along the construction method for building underground structure, which is characterized in that the step A
In:
The arch steel tube shed, ductule are set before middle drift excavation, or by deep hole grouting advance reinforcement stratum, and
Bracing means is increased to the transverse passage-way in cut into hole region.
7. ledge tunneling according to claim 5 is along the construction method for building underground structure, which is characterized in that the step C
In:
The first branch of the side pilot tunnel is welded and fixed with the arch steel tube shed.
8. ledge tunneling according to claim 5 is along the construction method for building underground structure, which is characterized in that the step G
In:
Two lined steel muscle of ledge is reserved for the ledge to plug into, and retains scaffold system until the ledge forms complete stress knot
Structure.
9. ledge tunneling according to claim 5 is along the construction method for building underground structure, which is characterized in that the step I
In:
The grid steel frame longitudinally removes length and is not more than 6m.
10. ledge tunneling according to claim 5 is along the construction method for building underground structure, which is characterized in that the step J
In:
During digging substrate, mechanical excavation to the position of the above 300mm of bed course, remaining is applied using manually excavating with excavation
Net spray supporting between work stake.
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| CN116838382A (en) * | 2023-09-01 | 2023-10-03 | 中国铁路设计集团有限公司 | Connection type and construction method of underground excavation subway station main body and auxiliary structure |
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