A kind of shallow-depth-excavation tunnel sump remedy method
The present invention relates to building engineering field, espespecially a kind of shallow-depth-excavation tunnel sump remedy method.
At present, the safety problem feature of shallow-depth-excavation tunnel landslide causes industry to note, for guaranteeing engineering safety, general uses cut and cover method to construct, and as site condition is simple, the slope excavating load of putting that optional construction costs is saved most is constructed；But in site condition by limited time, then needing the buried depth according to Tunnel Engineering to select diaphram wall, cast-in-situ bored pile etc. vertically to go along with sb. to guard him, add that inner supporting structure pattern is constructed, this arrangement and method for construction construction costs is high, the duration is also difficult to ensure that.
Summary of the invention
For solving above-mentioned technical problem, present invention is primarily targeted at a kind of shallow-depth-excavation tunnel sump remedy method.
For reaching above-mentioned purpose, the right technical scheme of the present invention is: a kind of shallow-depth-excavation tunnel sump remedy method, the step that the method includes: one is to remove at landslide the soil body to excavation line position first；Two is to excavate and construct arch springing channel-section steel backing plate and first half preliminary bracing again in the boundary line according to excavation line again, carries out vault afterwards and is backfilled to soil body backfill line；Three is to use benching tunnelling method to carry out in-cavity construction；Four are construction lower half preliminary bracings and use jumping storehouse method to be allowed to close cyclization, and five is bottom inverted arch Second Lining Construction, then uses lining trolley construction top secondary lining.
In this programme preferably, described arch springing channel-section steel backing plate farther includes to be woven into netted laying step with supporting shaped steel.
In this programme preferably, described benching tunnelling method is step excavating load, is by design section point upper half section and the step of lower half section excavation.
In this programme preferably, described jumping storehouse method is the step constructed in the way of partition programming, spacer block construction, placement layer by layer, global formation.
In this programme preferably, described face is the work surface just can pushed ahead constructor.
Compared with prior art, it has the advantages that the present invention: in the case of the most limited, both ensure that the enforcement safety of engineering, and had reduced again construction costs, saved construction investment.In addition, liner structure can bear the effect of water and soil load and other imposed load to use liner structure form of fracture both to ensure, reduces structure section size the most as far as possible and reduces liner structure arrangement of reinforcement, also saving construction costs equally.
Accompanying drawing explanation
Fig. 1 is that the first half preliminary bracing of the present embodiment tunnel applies schematic diagram
Fig. 2 is that the first half backfill of the present embodiment tunnel applies schematic diagram
Fig. 3 is that lower half of the present invention preliminary bracing applies schematic diagram
Fig. 4 is that Tunnel Second Lining of the present invention applies schematic diagram
Fig. 5 is first half preliminary bracing floor map of the present invention
As shown in Fig. 1～5,1-excavation line first, 2-excavation line again, 3-preliminary bracing, 4-arch angle channel-section steel backing plate, the 5-core soil body, 6-supporting shaped steel, 7-soil body backfill line, secondary lining bottom 8-, 9-top secondary lining.
Detailed description of the invention
The present invention is further illustrated below in conjunction with the accompanying drawings.
Refer to Fig. 1 and combine refering to shown in Fig. 2 to Fig. 5, the one shallow-depth-excavation tunnel sump remedy method of the present invention, including step be:
The first step, at removing landslide, the soil body is to excavation line 1 position first；
Second step, again excavate according to the boundary line of excavation line 2 again, and construct arch springing channel-section steel backing plate 4 and first half preliminary bracing 3, after district to be caved in first half preliminary bracing 3 construction, carry out vault backfill, being backfilled to soil body backfill line 7, described arch springing channel-section steel backing plate 4 is woven into netted laying with supporting shaped steel 6；
3rd step, benching tunnelling method is used to carry out in-cavity construction, described benching tunnelling method be one of construction method of tunnels and underground engineering have again positive benching tunnelling method and negative benching tunnelling method point, there are bucket step, short step and three kinds of ultrashort step by step length, due to the design of large cross-section tunnel, have again three steps interim inverted arch method, remaining core soil in advance body 5 benching tunnelling method, even multi-step method, because of the designing points of benching tunnelling method not the present embodiment, is not described in detail at this；
4th step, lower half preliminary bracing 3 of constructing, this lower half preliminary bracing 3 uses jumping storehouse method to carry out, is allowed to close cyclization.Described jumping storehouse method be take full advantage of concrete performance during 5 ~ 10 days not yet stable and thoroughly before solidification easily by internal stresses release " anti-and put " characteristic principle out, it is that structure foundation or large-area concrete plane mechanism are divided into several regions, construct according to the principle of " partition programming, spacer block construction, placement layer by layer, global formation ", its pattern is the same with Chinese checkers, i.e. waters one section every one section.The adjacent two spacer segment times are no less than seven days, and to avoid the concrete construction earlier part fierceness temperature difference and desiccation, such practice can not stay post-cast strip.It is professional terms owing to jumping storehouse method, is not described in detail at this；
5th step, bottom secondary lining 8 is constructed, when preliminary bracing 3 is closed cyclization and closes on face, with lining trolley construction top secondary lining 9, described face is a term in tunnel construction, i.e. excavates the work surface that tunnel (or in Tunnel Engineering) is constantly pushed ahead, sub-face can also be called, its not fixing face, excavation face has face, abutment wall face and vault face, is exactly that work surface constantly pushed ahead just to constructor.
By the shallow-depth-excavation tunnel sump remedy method of above-mentioned construction procedure, can effectively save construction investment, also duration and construction safety be ensured.
In sum, only the preferred embodiments of the invention, do not limit protection scope of the present invention with this, all equivalence changes made according to the scope of the claims of the present invention and description with modify, be all within the scope of patent of the present invention contains.