CN106014457A - Connection application of L-shaped grille joint in tunnel initial supporting structure - Google Patents
Connection application of L-shaped grille joint in tunnel initial supporting structure Download PDFInfo
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- CN106014457A CN106014457A CN201510129614.4A CN201510129614A CN106014457A CN 106014457 A CN106014457 A CN 106014457A CN 201510129614 A CN201510129614 A CN 201510129614A CN 106014457 A CN106014457 A CN 106014457A
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- arch springing
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Abstract
The invention relates to an L-shaped grille arch springing used for a connection joint between an initial support and a temporary support in a shallow-buried tunnel. The L-shaped grille arch springing comprises at least four L-shaped reinforcing steel bars which have equal diameter with an initial supporting grille on a connection joint position. The short edge of the L-shaped reinforcing steel bar is welded with the grille main reinforcing bar of the initial support, and is used as a reserved connection joint connected with the temporary support. The arch springing also comprises two blocks of angle iron welded with ends of a long edge of the L-shaped reinforcing steel bar. The L-shaped grille arch springing can enhance compactness, structural strength, tightness, and stability of concrete which is jetted on the joint of the initial supporting structure and the temporary supporting structure in a ring formation process of the tunnel initial supporting structure and after ring formation. In a second lining construction stage of the tunnel, the L-shaped grille arch springing can greatly reduce safety risks of tunnel structural deformation and collapse caused by removing the temporary support.
Description
Technical field
The present invention relates to the attachment structure used in a kind of shallow-depth-excavation tunnel engineering, a kind of shallow-depth-excavation tunnel connects the L-type grid arch springing that the intermediate node of preliminary bracing structure and temporary support structures is used.
Background technology
Shallow-depth-excavation tunnel construction method is a kind of method building subterranean tunnel in city.In the early stage in structure construction procedure, through environment risk source, special formation, often by the least for larger structure sectionization, it is divided into several duck eye hierarchical block excavation, to guarantee the safety in work progress.Need after piecemeal to increase gib can cyclization in time, this results in preliminary bracing (just propping up) structure and changes at the force way in each stage of constructing with temporary support structures: just propped up structure and temporary support structures stress during block construction by part；After the whole cyclization in all piecemeal tunnels, a just structure and the common stress of temporary support structures；When secondary lining (two linings) construction, need to remove gib, tunnel structure transfers a just structure stress to.
At present at the beginning of tunnel with the intermediate node of gib be connected by be close to mode and be connected, two block plates are i.e. used to be respectively welded at just tunnel grid medial surface and gib termination, bolted-on is used together, so that just propping up and gib cyclization when construction.It is one piece of bigger junction steel plate that grid because just propping up connects node inner side, thus causing when construction of shotcrete, steel plate rear area is injection blind area, the injection leakiness in this region, it is easily formed hole, causes a just structural concrete that fracture belt occurs at node.And, when subsequent construction, often cause an inwardly projecting deformation at the beginning of tunnel because of stratum soil lateral pressure.In later stage two lining structure work progress, after removing gib, easily cause malformation excessive, cause tunnel cave, and then develop into ground landslide, impact the serious accident of traffic above-ground.
Summary of the invention
For solving the problems referred to above, patent of the present invention proposes to connect in a kind of shallow-depth-excavation tunnel just props up the L-type grid arch springing that the intermediate node with gib is used.This L-type grid arch springing can strengthen the degree of compaction of concrete, structural strength, compactness and the stability of injection at a structure at the beginning of tunnel and temporary support structures node at the beginning of tunnel structure annulation process and after cyclization；In the tunnel double-lining construction stage, the security risk causing tunnel structure deformation because removing gib and caving in can be substantially reduced.
For realizing above-mentioned beneficial effect, the technical scheme that the present invention takes by: a kind of shallow-depth-excavation tunnel connects the L-type grid arch springing that just intermediate node with gib is used, the connection node location between gib is propped up just with a just grid isodiametric L-type reinforcing bar, L-type reinforcing bar including at least 4；The minor face of L-type reinforcing bar is welded on the main muscle of grid just propped up, as the reserved connection node being connected with gib.
Preferably, the minor face of L-type reinforcing bar uses welding by both sides connection to be welded on the main muscle of grid just propped up.
Preferably, the bond length of L-type reinforcing bar is 5 times of bar diameter, and the long edge lengths scope of L-type reinforcing bar is in 300～500mm, and concrete length is determined by on-site actual situations.
Preferably, L-type grid arch springing also includes the two blocks of angle steel being welded on termination, L-type reinforcing bar long limit, bolts with gib for will just be propped up by bolt.
Preferably, the termination end face of above-mentioned angle steel is parallel with tunnel structure center line or vertical.
Preferably, L-type grid arch springing also includes the 4 single u-shaped muscle being welded between L-type reinforcing bar, for reinforcing just a structure and the pin-connected joint of gib.
The invention has the beneficial effects as follows:
(1) present invention use 4 with a just grid isodiametric L-type reinforcing bar, make just with the grid node of gib at concrete can spray closely knit, stop cavity；When removing gib in two lining work progress, structure stress can well be transferred to just prop up in structure, it is ensured that will not cause a just malformation, stop the security incidents such as tunnel cave.
(2) the L-type reinforcing bar of the present invention uses two-sided welding with the main muscle of grid just propped up, and working space is unrestricted, it is ensured that welding quality；The bond length of L-type reinforcing bar is 5 times of bar diameter, can meet two-sided welding fusion length code requirement；And prior art uses close contact to connect, needing to weld steel plate, owing to steel plate area is big, and be plane, and just prop up grid and have certain radian, welding quality is difficult to ensure the most therebetween.
(3) the angle steel termination end face of the present invention is parallel with tunnel structure center line or vertical, it is simple to bolt, it is ensured that quality of connection；Grid reinforcing bar has certain radian, and the steel plate of prior art is straight plate, connects not tight, there is potential safety hazard when follow-up gib connects.
(4) node connection of the present invention and a just grid concrete capable of simultaneous injection, increase stiffness and the intensity of this node, during follow-up gib construction, can use shaped steel in a large number, and the recyclable secondary of this shaped steel utilizes, and reduces investment.
(5) follow-up two lining constructions are when removing gib, can abolish gunite concrete in advance at node, and shaped steel can not be removed, to be onstructed to abolishing at node concrete time at this again and removing shaped steel, reduce the potential safety hazard removed.
Accompanying drawing explanation
Fig. 1 is to prop up and gib and the position of node at the beginning of various shallow-depth-excavation tunnel structure.
Fig. 2 is first and gib node connecting structure of prior art.
Fig. 3 is first and the gib node connecting structure, i.e. L-type grid arch springing of the present invention.
Wherein: 1, just prop up, 2, gib, 3, connect node, the leakiness region of 4, just a structure gunite concrete, 5, just a concrete ejection direction, 6, be welded to connect steel plate, 7, first the main muscle of grid, 8, L-type reinforcing bar, 9, angle steel.
Detailed description of the invention
Further illustrate embodiments of the invention below in conjunction with the accompanying drawings.
Fig. 1 is several versions common in the construction of current shallow-depth-excavation tunnel, describes in detail and just props up the relation between 1 and gib 2 and position, and the design position of common connection node 3.1 be just wherein permanent structure, gib 2 is the temporary structure in work progress, needs to remove when follow-up two serve as a contrast construction operation, just connects by being connected node 3 between 1 with gib 2, formation entirety force structure.
Fig. 2 is just to prop up the attachment structure between 1 and gib 2 in prior art, is specially and adds man-hour at grid, and by welding a monoblock steel plate 6 at grid main muscle 7 inner crest face just propped up, one block of identical steel plate 6 is also welded in corresponding gib termination.When tunnel excavation is constructed, after just a grid and gib install, it is perpendicular to grid direction gunite concrete by tunnel internal, because steel plate 6 area is bigger, steel plate 6 region below can form injection blind area, cause concrete to spray closely knit, form cavity and loose region 4, there is hidden danger of quality.And follow-up two need to remove gib 2 when serving as a contrast construction, a just 1 inwardly projecting deformation at connection node 3 will be caused, closely cause security incidents such as caving in.
Fig. 3 is first and the gib node connecting structure, i.e. L-type grid arch springing of the present invention.Just it is welded with 4 connecting on a grid at node 3 with a just main muscle of grid with the L-type reinforcing bar 8 of diameter；The bond length of L-type reinforcing bar 8 is 5 times of bar diameter, thus meets two-sided welding fusion length code requirement；Long edge lengths scope is 300～500mm, and concrete length is determined by on-site actual situations.The termination, long limit of L-type reinforcing bar 8 uses two blocks of angle steel 9 to weld therewith, as the pin-connected joint of a just structure with gib.Between angle steel 9 termination and L-type reinforcing bar, weld 4 single u-shaped muscle, reinforce just a structure and the pin-connected joint termination of gib.The termination end face of angle steel is parallel with tunnel structure center line or vertical, it is simple to bolt, to ensure quality of connection.When constructing tunnel, L-type grid arch springing is not because having blocking of steel plate, the concrete 5 of injection can be closely knit by spraying at this, thus eliminate cavity loose region 4, the quality of a just structure can either be ensured, a just structure 1 can be occurred without when gib 2 is removed in follow-up two lining constructions again and protrude deformation and the problem caved in, eliminate safe hidden trouble.
Longest less than 500mm due to L-type grid arch springing, and gunite concrete and a just structure synchronization, therefore at this, intensity can well be ensured；The gib 2 of subsequent installation just can use shaped steel, while controlling deformation, it is also possible to reclaims secondary and utilizes, reduces investment.
Because middle part gib uses shaped steel in a large number, when the later stage removes, can first abolish the gunite concrete of steel sections, abolish a small amount of concrete connected at node when gib shaped steel is removed again, both can accelerating construction progress, can guarantee that again dismounting safety.
Claims (7)
1. a shallow-depth-excavation tunnel connects and just prop up the L-type grid arch springing that the intermediate node with gib is used, it is characterized in that, this L-type grid arch springing includes being positioned at least 4 L-type reinforcing bars just propping up the intermediate node with gib, and the minor face of L-type reinforcing bar is fixedly connected on the main muscle of grid just propped up.
2. L-type grid arch springing as claimed in claim 1, the diameter of L-type reinforcing bar is equal with the main muscle of grid just propped up.
3. L-type grid arch springing as claimed in claim 1, it is characterised in that the minor face of L-type reinforcing bar uses welding by both sides connection to be welded on the main muscle of grid just propped up.
4. L-type grid arch springing as claimed in claim 1, it is characterised in that the bond length of L-type reinforcing bar is 5 times of bar diameter, and the long edge lengths scope of L-type reinforcing bar is in 300～500mm.
5. the L-type grid arch springing as according to any one of Claims 1-4, it is characterised in that L-type grid arch springing also includes the two blocks of angle steel being welded on termination, L-type reinforcing bar long limit.
6. L-type grid arch springing as claimed in claim 5, it is characterised in that the termination end face of angle steel is parallel with tunnel structure center line or vertical.
7. L-type grid arch springing as claimed in claim 5, it is characterised in that L-type grid arch springing also includes the 4 single u-shaped muscle being welded between L-type reinforcing bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510129614.4A CN106014457A (en) | 2015-03-24 | 2015-03-24 | Connection application of L-shaped grille joint in tunnel initial supporting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510129614.4A CN106014457A (en) | 2015-03-24 | 2015-03-24 | Connection application of L-shaped grille joint in tunnel initial supporting structure |
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| CN106014457A true CN106014457A (en) | 2016-10-12 |
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| CN201510129614.4A Pending CN106014457A (en) | 2015-03-24 | 2015-03-24 | Connection application of L-shaped grille joint in tunnel initial supporting structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111622776A (en) * | 2020-06-24 | 2020-09-04 | 中铁第五勘察设计院集团有限公司 | Primary support framework node structure of underground excavation tunnel |
| CN114151092A (en) * | 2021-11-19 | 2022-03-08 | 北京市轨道交通建设管理有限公司 | Tunnel expanding and excavating connecting device and tunnel expanding and excavating method |
| CN117248940A (en) * | 2023-11-02 | 2023-12-19 | 水利部交通运输部国家能源局南京水利科学研究院 | Arch frame structure for preventing primary support of small-section tunnel from falling out |
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| JP2004108128A (en) * | 2002-09-19 | 2004-04-08 | Yasuo Kawada | Building method for building frame of steel-framed building using trapezoidal frame |
| CN101832141A (en) * | 2009-03-11 | 2010-09-15 | 中铁十三局集团有限公司 | Method for connecting temporary supports of tunnel |
| CN202851011U (en) * | 2012-10-26 | 2013-04-03 | 中铁二十二局集团第六工程有限公司 | Existing grate and novel grate connecting system in tunnel construction |
| CN202900288U (en) * | 2012-10-31 | 2013-04-24 | 中建八局第三建设有限公司 | Steel section skeleton combined structure of tunnel minor radius section lining pouring |
| CN104100278A (en) * | 2014-07-08 | 2014-10-15 | 中铁十六局集团第五工程有限公司 | Construction method for demolishing original arch frames and primarily supporting windings of transition sections of tunnels |
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2015
- 2015-03-24 CN CN201510129614.4A patent/CN106014457A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004108128A (en) * | 2002-09-19 | 2004-04-08 | Yasuo Kawada | Building method for building frame of steel-framed building using trapezoidal frame |
| CN101832141A (en) * | 2009-03-11 | 2010-09-15 | 中铁十三局集团有限公司 | Method for connecting temporary supports of tunnel |
| CN202851011U (en) * | 2012-10-26 | 2013-04-03 | 中铁二十二局集团第六工程有限公司 | Existing grate and novel grate connecting system in tunnel construction |
| CN202900288U (en) * | 2012-10-31 | 2013-04-24 | 中建八局第三建设有限公司 | Steel section skeleton combined structure of tunnel minor radius section lining pouring |
| CN104100278A (en) * | 2014-07-08 | 2014-10-15 | 中铁十六局集团第五工程有限公司 | Construction method for demolishing original arch frames and primarily supporting windings of transition sections of tunnels |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111622776A (en) * | 2020-06-24 | 2020-09-04 | 中铁第五勘察设计院集团有限公司 | Primary support framework node structure of underground excavation tunnel |
| CN114151092A (en) * | 2021-11-19 | 2022-03-08 | 北京市轨道交通建设管理有限公司 | Tunnel expanding and excavating connecting device and tunnel expanding and excavating method |
| CN114151092B (en) * | 2021-11-19 | 2024-05-14 | 北京市轨道交通建设管理有限公司 | Tunnel expanding and excavating connecting device and tunnel expanding and excavating method |
| CN117248940A (en) * | 2023-11-02 | 2023-12-19 | 水利部交通运输部国家能源局南京水利科学研究院 | Arch frame structure for preventing primary support of small-section tunnel from falling out |
| CN117248940B (en) * | 2023-11-02 | 2024-05-14 | 水利部交通运输部国家能源局南京水利科学研究院 | Arch frame structure for preventing primary support of small-section tunnel from falling out |
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Application publication date: 20161012 |