CN207453988U - A kind of pile foundation underpinning system based on double-deck permanent lining, secondary lining structure - Google Patents
A kind of pile foundation underpinning system based on double-deck permanent lining, secondary lining structure Download PDFInfo
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- CN207453988U CN207453988U CN201721337916.1U CN201721337916U CN207453988U CN 207453988 U CN207453988 U CN 207453988U CN 201721337916 U CN201721337916 U CN 201721337916U CN 207453988 U CN207453988 U CN 207453988U
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Abstract
The utility model is related to a kind of pile foundation underpinning systems based on double-deck permanent lining, secondary lining structure.By surrounding enviroment and traffic impact, during Tunnel Passing existing pile foundation, conventional simply supported beam-stake underpins system may be without implementation condition.The utility model includes underpining lining cutting and internal tunnel lining cutting double-deck permanent lining, secondary lining structure dimerous by outside；It underpins lining cutting to perform between tunnel-liner and existing pile foundation, existing pile foundation bottom, which is stretched into underpin in lining cutting and formed, underpins node, and effectively connection is realized using bar planting and reinforcing steel bar machinery anchoring at node.The utility model realizes that effective transfer of load on pile foundation underpins with structure, utmostly reduce the adverse effect of Tunnel Passing existing pile foundation construction, with settlement Control it is good, underpin the safe and reliable advantage of system, it avoids conventional beam-column bracket and changes the shortcomings of system construction environment influences big, cost height, stress system is complicated, filled up the blank that domestic and abroad bridge pile foundation uses tunnel-liner to underpin.
Description
Technical field
The utility model belongs to Tunnel Engineering technical field, and in particular to a kind of pile foundation based on double-deck permanent lining, secondary lining structure
Underpin system.
Background technology
For the railway traffic engineering of current cities in China, with the continuous encryption of subway gauze, follow-up subway line
When road is built, influenced by built subway line and surrounding enviroment, in line alignment and paving mode, spatial relationship and structural type
Formula and construction method and the requirement of engineering measure etc. are harsher.When Tunnel Passing existing pile foundation and with pile foundation space
It during conflict, is limited by site condition, surrounding enviroment and road traffic, the system that underpins of conventional simply supported beam-pile-type formula may nothing
Implementation condition.
The content of the invention
The purpose of this utility model is to provide a kind of pile foundation underpinning system based on double-deck permanent lining, secondary lining structure, realizes pile foundation
Effective transfer of load utmostly reduces the adverse effect of Tunnel Passing existing pile foundation construction.
Technical solution is used by the utility model：
Pile foundation underpinning system based on double-deck permanent lining, secondary lining structure, it is characterised in that：
Including underpining lining cutting and internal tunnel-liner double-deck permanent lining, secondary lining structure dimerous by outside；
It underpins lining cutting to perform between tunnel-liner and existing pile foundation, existing pile foundation bottom, which is stretched into, to be underpined in lining cutting and formed
Node is underpined, is realized using bar planting and reinforcing steel bar machinery anchoring at node and effectively connected, pile foundation underpinning scope inner tunnel is using double-deck
Permanent lining, secondary lining structure.
It underpins and waterproof layer is provided between lining cutting and tunnel-liner.
It underpins and preliminary bracing has been performed on the outside of lining cutting, grouting small pilot pipe, and pressure injection cement are laid on the outside of preliminary bracing
Slurry.
Preliminary bracing is mixed with the spray of first branch and formed by grid steel frame, steelframe connector, and grid steel frame arch springing sets lock foot anchor tube；
Vertical interim type steel support and horizontal direction interim type steel support are set inside preliminary bracing.
It underpins lining cutting to underpin at node with what existing pile foundation was crossed to form, existing pile foundation pile body surrounding implantation steel bar stress.
The utility model has the following advantages：
The utility model provides a kind of new pile foundation underpinning structure System Design theory, enriches existing pile foundation support
Technique is changed, has widened the mentality of designing of underpinning technique.In the grouting small pilot pipe of tunnel arch and face setting, initial stage branch
The cement mortar of pressure injection, liner structure are used in the interim type steel support and slip casting ductule that shield grid steel frame, tunnel internal are set
Steel and concrete etc., the steel being related to, cement mortar, water-proof concrete and slip casting ductule set mechanical equipment used etc.
It is conventional material（Equipment）, corresponding size be general type, manufacture easy to process；And the horizontal layout of slip casting ductule,
Quantity can be adjusted with length according to condition of construction, and the longitudinal pitch of grid steel frame and interim type steel support can be supervised according to construction
Survey situation is adjusted flexibly.Pre-pouring grout based on grouting small pilot pipe is reinforced, grid steel frame and internal interim type steel support longitudinal direction
Spacing be adjusted flexibly and CRD engineering methods break the whole up into parts construction step is continuous, it can be achieved that the safety of Tunnel Engineering itself, based on plant
Muscle technology is with uniform strength reinforcing bar mechanical anchor technology, it can be achieved that underpining effective connection of the pile foundation with underpining lining cutting, realization at node
Effective conversion of new and old structure load, it is ensured that the safety of existing pile foundation structure and Tunneling by mining method structure reduces potential uneasy
Total factor, reaches that can to meet surrounding enviroment harsh small with floor space and reach the requirement that load underpins, and avoids routine
During simply supported beam-stake underpins system implementation, noise is big, it is big to take up an area at the same it may also be desirable to carry out underground utilities move change it is unfavorable
It influences.With higher economic benefit and social benefit, widely should have in the engineerings such as urban track traffic, railway, highway
Use prospect.
Description of the drawings
Fig. 1 is double-deck trimmed tunnel structure transverse face layout drawing.
Fig. 2 is double-deck trimmed tunnel excavated section supporting figure.
Fig. 3 is the A drawings in Fig. 2.
Fig. 4 is pile foundation underpinning node drawing.
In figure, 1- existing pile foundations, 2- underpins lining cutting, and 3- tunnel-liners, 4- waterproof layers, 5- preliminary bracings, 6- slip castings are small to be led
Pipe, 7- grid steel frames, 8- steelframe connectors, 9- just branch sprays are mixed, 10- lock foot anchor tubes, the vertical interim type steel supports of 11-, 12- horizontal directions
Interim type steel support, 13- implantation reinforcing bars, 14- invade the part pile foundation in tunnel-liner, 15- pile foundation stirrups, and 16- underpins lining cutting
Main reinforcement.
Specific embodiment
The utility model is described in detail With reference to embodiment.
The utility model is related to the pile foundation underpinning system based on double-deck permanent lining, secondary lining structure, pass through grouting small pilot pipe
Stratum pre-reinforcement（Or steel tube shed is reinforced）, CRD methods are excavated, grid steel frame ensures that tunnel is applied with the internal measures of type steel support etc. temporarily
Work safety, performs underpin lining cutting on this basis, and existing pile foundation load is effectively transferred to by underpining node and underpins lining cutting, with
Tunnel-liner is performed again underpining lined internal afterwards.Structure includes underpining lining cutting 2 and internal tunnel-liner 3 two by outside
The double-deck permanent lining, secondary lining structure be grouped into.It underpins lining cutting 2 to perform between tunnel-liner 3 and existing pile foundation 1, underpins lining cutting 2 and exist
It should try one's best on structure outline and cover existing pile foundation 1, it is ensured that existing pile foundation 1 is effectively connected with underpining at 2 connecting node of lining cutting, is met
Structure stress is with underpining requirement.Meanwhile in the case where underpining lining cutting 2 and reaching design strength, the portion of intrusion tunnel scope is cut
Divide existing pile foundation 1, it is ensured that 1 upper load of existing pile foundation, which is effectively transferred to, to be underpined in lining cutting 2.Underpin lining cutting 2 and existing pile foundation 1
It underpins and effectively connection is realized by bar planting and reinforcing steel bar machinery anchoring at node, meet the delivery request of load between new and old structure.
It underpins and waterproof layer 4 is provided between lining cutting 2 and tunnel-liner 3, reach structure separating effect, specific tunnel cross-section ruler
It is very little to be determined with practical range according to structure function and inner space requirement.
It underpins 2 outside of lining cutting and has performed preliminary bracing 5, grouting small pilot pipe 6, and pressure injection are laid in 5 outside of preliminary bracing
Cement mortar.
Preliminary bracing 5 is made of grid steel frame 7, steelframe connector 8 and first branch spray mixed 9, and 7 arch springing of grid steel frame sets lock foot anchor
Pipe 10.Grid steel frame 7 uses grade III steel, and steelframe connector 8 uses Q235 steel, and spray mixed 9 uses C25 early strength concretes.Grid steel
7 inside of frame erects vertical interim type steel support 11 and the interim type steel support 12 of horizontal direction.
Underpining at node for lining cutting 2 and existing pile foundation 1 is underpined, 1 pile body ring week of existing pile foundation is angularly implanted into steel bar stress
13。
During tunnel excavation, excavated using 6 grouting and reinforcing of advanced tubule, and using CRD methods, grid is set up in time in excavation
Steelframe 7 simultaneously sprays mixed, while notices that cyclization is closed in preliminary bracing 5 as early as possible.The inside of grid steel frame 7 erect interim type steel support 11 with
It is identical longitudinally to excavate step pitch with tunnel by 12, the grid steel frame 7 and generally desirable 0.5m of interim shaped steel longitudinal pitch.In preliminary bracing 5
Portion, which pours, underpins lining cutting 2, and existing pile foundation 1 uses embedding re-bar technique and reinforcing steel bar machinery anchorage technology with underpining at 2 connecting node of lining cutting,
Meet effective transmission of load.It underpins and tunnel-liner 3 is poured inside lining cutting 2, and spread on request between inside and outside two layers of stress lining cutting
It sets up defences water layer 4.
The construction method of the above-mentioned pile foundation underpinning system based on double-deck permanent lining, secondary lining structure, comprises the following steps：
Step 1：Grouting small pilot pipe 6 is set in tunnel arch and face, is arranged in blossom type, slip casting ductule 6
It spatially avoids being underpined pile foundation 1 and grouting methol, it is ensured that above tunnel vault and excavation front of tunnel heading stratum is formed
Reliable Load -carring arch and the improvement soil body；
Step 2：It is constructed, is excavated by the order of upper left quarter, lower left quarter, upper right quarter and right lower quadrant, every portion is opened using CRD methods
Remaining core soil in advance during digging hangs bar-mat reinforcement and just pneumatically placed concrete after excavation, then sets up grid steel frame 7 and answers pneumatically placed concrete, upper half
After section grid steel frame 7 is set up, performed in time at arch springing lock foot anchor tube 10 and with 7 firm welding of grid steel frame, perform vertical
Interim type steel support 11 and the interim type steel support 12 of horizontal direction；
Step 3：In the radially embedded slip casting steel pipe in arch, blossom type arrangement, when preliminary bracing 5 when preliminary bracing 5 is constructed
After being closed cyclic certain length, i.e., to lining cutting behind grouting methol；
Step 4：Preliminary bracing 5, which performs, to be completed and treats 3 meters of rear enclosed faces of half section excavation drilling depth, is performed existing
Pile foundation 1 underpins lining cutting 2, realizes have by bar planting and reinforcing steel bar machinery anchoring at 2 connecting node of lining cutting with underpining in existing pile foundation 1
Effect connection；It underpins and buries radial grouting steel pipe when lining cutting 2 is constructed in arch, blossom type arrangement, it is strong that lining cutting 2 to be underpined reaches design
After degree, i.e., starched to behind pressure injection micro-expansion cement；
Step 5：After underpining lining cutting 2 and reaching design strength, the part pile foundation of intrusion 3 scope of tunnel-liner is progressively cut
14, using static(al) cutting technique；
Step 6：Progressively remove vertical interim type steel support 11 and the interim type steel support 12 of horizontal direction, the length removed every time
Degree is no more than 0.5 times of tunnel excavation span, and then according to underpining, 2 surface mortar of lining cutting smoothes out, waterproof layer 4 is laid with, steel reinforcement cage
The sequence construction that binding, tunnel-liner 3 pour；Radial grouting steel pipe, blossom type cloth are buried when tunnel-liner 3 pours in arch
It puts, after tunnel-liner 3 is closed cyclization and reaches some strength, i.e., is starched to behind pressure injection micro-expansion cement.
The use diameter 42mm of tunnel arch grouting small pilot pipe 6, wall thickness 3.5mm steel pipes, long 3m, circumferential spacing 0.3m,
Longitudinal pitch 1.5m, outer 10 ° of limb, 150 ° of arch scope is circumferential to be laid；Tunnel tunnel face periphery grouting small pilot pipe 6 is circumferential
Spacing 0.4m, remaining 1m, longitudinal pitch 1.5m, blossom type arrangement, face periphery ductule extrapolation angle are 35 °, remaining water
Square to setting.
It locks foot anchor tube 10 and uses diameter 42mm, the steel floral tube of wall thickness 3.5mm, long 3m, internal pressure injection cement-sodium silicate pair
Slurry, with 7 firm welding of grid steel frame, longitudinal pitch is identical with grid steel frame 7.
Inbuilt slip casting steel pipe is arranged using diameter 42mm, ring, longitudinal pitch 3.0m, blossom type when preliminary bracing 5 is constructed,
Internal grouting methol, slip casting steel pipe and 7 firm welding of grid steel frame；Underpin inbuilt note when lining cutting 2 is constructed with tunnel-liner 3
Steel pipe is starched using diameter 42mm, circumferential spacing 3.0m, internal pressure injection micro-expansion cement slurry, pre-buried mode is the same as preliminary bracing 5.
It underpins lining cutting 2 and III level reinforcing bar of the reinforcing bar 13 using diameter 22mm is implanted at node with underpining for existing pile foundation 1, it is single
Root long degree is 1000mm, implantation depth 350mm；It underpins and 2 reinforcing bar of lining cutting is underpined at node with remaining position principal rod using reinforcing bar
Connector is mechanically connected.
Pile foundation underpinning system and its construction method based on double-deck permanent lining, secondary lining structure, have that environmental suitability is strong, underpins
The features such as structure is safe and reliable, small to urban environment and traffic impact.Node is underpined to anchor using embedding re-bar technique and reinforcing steel bar machinery
Technology realizes that existing pile foundation is transferred with underpining effectively being connected for lining cutting with load, while performs tunnel lining underpining lined internal
Build, and using waterproof layer carry out structure separation, both met bearing capacity of pile foundation requirement, also meet tunnel self structure stress with
Stability requirement avoids conventional simply supported beam-stake and underpins system and limited by site condition and surrounding enviroment, this is this practicality
New essential characteristic has filled up the blank that domestic and abroad bridge pile foundation uses tunnel-liner to underpin.
The content of the utility model is not limited to cited by embodiment, and those of ordinary skill in the art are new by reading this practicality
Type specification and to any equivalent conversion that technical solutions of the utility model are taken, be the claim institute of the utility model
Cover.
Claims (5)
1. a kind of pile foundation underpinning system based on double-deck permanent lining, secondary lining structure, it is characterised in that：
Including underpining lining cutting by outside（2）With internal tunnel-liner（3）Bilayer permanent lining, secondary lining structure dimerous；
Underpin lining cutting（2）It performs in tunnel-liner（3）And existing pile foundation（1）Between, existing pile foundation（1）Bottom, which is stretched into, underpins lining cutting
（2）Interior and formation underpins node, is realized using bar planting and reinforcing steel bar machinery anchoring at node and effectively connected, tunnel in the range of pile foundation underpinning
Road is using double-deck permanent lining, secondary lining structure.
2. a kind of pile foundation underpinning system based on double-deck permanent lining, secondary lining structure according to claim 1, it is characterised in that：
Underpin lining cutting（2）With tunnel-liner（3）Between be provided with waterproof layer（4）.
3. a kind of pile foundation underpinning system based on double-deck permanent lining, secondary lining structure according to claim 1, it is characterised in that：
Underpin lining cutting（2）Outside has performed preliminary bracing（5）, preliminary bracing（5）Lay grouting small pilot pipe in outside（6）, and
Grouting methol.
4. a kind of pile foundation underpinning system based on double-deck permanent lining, secondary lining structure according to claim 3, it is characterised in that：
Preliminary bracing（5）By grid steel frame（7）, steelframe connector（8）It is mixed with the spray of first branch（9）Composition, grid steel frame（7）Arch springing is set
Lock foot anchor tube（10）；
Preliminary bracing（5）Inside sets vertical interim type steel support（11）With the interim type steel support of horizontal direction（12）.
5. a kind of pile foundation underpinning system based on double-deck permanent lining, secondary lining structure according to claim 1, it is characterised in that：
Underpin lining cutting（2）With existing pile foundation（1）What is be crossed to form underpins at node, existing pile foundation（1）Pile body surrounding is implanted into stress
Reinforcing bar（13）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721337916.1U CN207453988U (en) | 2017-10-18 | 2017-10-18 | A kind of pile foundation underpinning system based on double-deck permanent lining, secondary lining structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721337916.1U CN207453988U (en) | 2017-10-18 | 2017-10-18 | A kind of pile foundation underpinning system based on double-deck permanent lining, secondary lining structure |
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| CN207453988U true CN207453988U (en) | 2018-06-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107701203A (en) * | 2017-10-18 | 2018-02-16 | 中铁第勘察设计院集团有限公司 | Pile foundation underpinning system and its construction method based on double-deck permanent lining, secondary lining structure |
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2017
- 2017-10-18 CN CN201721337916.1U patent/CN207453988U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107701203A (en) * | 2017-10-18 | 2018-02-16 | 中铁第勘察设计院集团有限公司 | Pile foundation underpinning system and its construction method based on double-deck permanent lining, secondary lining structure |
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