CN104295301A - Shallow-buried excavation construction method for cataclastic rock subway tunnel intersection - Google Patents
Shallow-buried excavation construction method for cataclastic rock subway tunnel intersection Download PDFInfo
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- CN104295301A CN104295301A CN201410401175.3A CN201410401175A CN104295301A CN 104295301 A CN104295301 A CN 104295301A CN 201410401175 A CN201410401175 A CN 201410401175A CN 104295301 A CN104295301 A CN 104295301A
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- crosspoint
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- headwall
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- 238000010276 construction Methods 0.000 title claims abstract description 50
- 238000009412 basement excavation Methods 0.000 title claims abstract description 43
- 239000011435 rock Substances 0.000 title claims abstract description 26
- 239000002689 soil Substances 0.000 claims abstract description 10
- 238000005520 cutting process Methods 0.000 claims description 21
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 239000011150 reinforced concrete Substances 0.000 claims description 8
- 238000007569 slipcasting Methods 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 5
- 230000003116 impacting effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000001934 delay Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a shallow-buried excavation construction method for a cataclastic rock subway tunnel intersection. The method includes the following steps that an upper step of the intersection of a body station and an air duct is excavated first, and certain loads are released; then, a lower pilot tunnel is excavated from the air duct to the intersection, and construction is carried out to an end wall; a slotted hole is excavated from the upper step to a lower step of the intersection, and a connector ring beam structure is formed; soil mass of a certain width is excavated in the middle of a middle step of the intersection, a two-lining structure is formed, and the two-lining structure and a ring beam form an overall framework structure; after the two-lining structure is finally set, the soil mass on the other parts of the middle step is excavated, and accordingly an overall structure is achieved. The shallow-buried excavation construction method for the cataclastic rock subway tunnel intersection is widely applied to a large-section intersection tunnel which is shallow in coverage, broken in rock and strict in settlement control, the stable framework structure is formed first, the span impacting effect in large-section construction can be reduced, the settlement deformation of cataclastic rocks can be effectively controlled, and thus the construction safety and the overall stability of intersection tunnels can be guaranteed.
Description
Technical field
The present invention relates to the construction method in a kind of shallow buried covered excavation cracked rock mass subway tunnel crosspoint.
Background technology
Along with the high speed development of Urbanization in China, it is developing leading that city underground has become track traffic.The business district in prosperity is often built in subway station, and this region surface control is tight, difficulty of construction is large, safe class is high, brings great challenge to the design of subway engineering and construction.Especially at cracked rock mass subway tunnel crosspoint place, its section configuration is complicated, both sides free face is large, corner point easily forms that stress is concentrated, the construction of rock crusher joints development, adjacent tunnel easily produces the features such as multiple electrodes, often produces free face unstable failure, construction period delays, earth's surface large area depression, upper building ftracture the problems such as even inclination in work progress.
At present, both at home and abroad tunnel cross point is not also studied targetedly, general employing benching tunnelling method or many pilot tunnels middle-wall method, often strengthen support rigidity to control stratum deformation or increase supporting measure, support cost is caused to increase severely, supporting operation is loaded down with trivial details, exacerbates labor intensive, delays the construction period.Therefore, prior art needs further improvement and develops.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, the construction method in a kind of shallow buried covered excavation cracked rock mass subway tunnel crosspoint that the object of the present invention is to provide, to control the sedimentation and deformation of cracked rock mass, improves efficiency of construction, guarantees the construction safety of intersection cavern.
For solving the problems of the technologies described above, the present invention program comprises:
The construction method in shallow buried covered excavation cracked rock mass subway tunnel crosspoint, it comprises the following steps:
Step one, by main body station to section excavation middle drift on the crosspoint in main body station and air channel, enters hole by Pin support type steel door frame, constructs to headwall, and complete preliminary bracing;
Step 2, by middle drift to the left pilot tunnel in air channel, right pilot drive, in time erection median septum temporary support, until to make on main body station section on section and air channel through, applies preliminary bracing and closes country rock;
Step 3, from air channel, left pilot tunnel, right pilot drive are got out of a predicament or an embarrassing situation and are entered above-mentioned crosspoint, apply preliminary bracing, when being excavated to headwall, apply headwall supporting;
Step 4, tops bar from main body station middle drift to excavation crosspoint, headwall direction, and erection median septum temporary support, is excavated to headwall and completes headwall supporting;
Step 5, the middle soil body of excavation air channel and interface collar tie beam position, main body station, middle bench excavation slotted eye, applies net spray supporting;
Step 6, air channel choose high section get out of a predicament or an embarrassing situation bottom right side extend out excavation 50cm, frame founds grillage, every Pin bow member sets four grouting pipe, and applying preliminary bracing, apply bottom ring beam and sidepiece collar tie beam after preliminary bracing completes, then monobloc cast upper ring beam and main body station remain two and serve as a contrast;
Step 7, removes crosspoint and to get out of a predicament or an embarrassing situation middle temporary support, then apply inverted arch lining cutting and inverted arch backfill;
Step 8, inverted arch position in the middle of corresponding, step remaining soils in excavation, and the temporary support of removing corresponding median septum of topping bar, complete preliminary bracing, applies lining cutting and connect with collar tie beam is suitable;
Step 9, after middle two lining final set, excavate and construct near the lining cutting in headwall direction, then apply the lining cutting near Outboard Sections, construction way is the same; Complete the construction at air channel and crosspoint place, main body station.
Described construction method, wherein, in described step one, support type steel door frame adopts hot-rolled steel section manufacture.
Described construction method, wherein, the preliminary bracing in described step one adopts anchor pole and in-network processing.
Described construction method, wherein, the median septum temporary support in described step 2 adopts hot-rolled steel section.
Described construction method, wherein, the headwall supporting in described step 3 adopts grid steel frame, slip casting ductule and in-network processing composition.
Described construction method, wherein, the collar tie beam in described step 6 adopts reinforced concrete structure, and its section configuration is rectangle.
Described construction method, wherein, main body station residue two lining in described step 6 refers to when applying car body station two lining structure, and reserved two linings near crosspoint, make it and collar tie beam monobloc cast, avoid the generation of constuction joint.
Described construction method, wherein, the inverted arch lining cutting in described step 7 adopts monolithic reinforced concrete structure.
The construction method in a kind of shallow buried covered excavation provided by the invention cracked rock mass subway tunnel crosspoint, it is widely used in covering the big cross section cross tunnel shallow, rock mass is cracked, settlement Control is tight, first form stable frame construction, the span influential effect of big cross section construction can be reduced, the sedimentation and deformation of the cracked rock mass of effective control, guarantees construction safety and the monolithic stability of intersection cavern.After frame construction is stable, crosspoint and bottom, main body station rock mass can be excavated simultaneously, slag tap from station and air channel simultaneously, improve the speed of application of cross tunnel, significantly shorten the construction period, improve efficiency of construction; And the present invention does not need additionally to increase supporting operation, overcomes the shortcoming that support rigidity is excessive, supporting operation is loaded down with trivial details in kataclastics body construction, there is advantage that is safe and efficient, economical rationality.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the main body station in step one of the present invention to crosspoint excavation middle drift;
Fig. 2 is the schematic diagram that the middle drift in step 2 of the present invention excavates to air channel;
Fig. 3 is the schematic diagram of pilot tunnel under the excavation crosspoint in step 3 of the present invention;
Fig. 4 is the schematic diagram that the middle drift in step 4 of the present invention excavates to headwall direction;
Fig. 5 is the plan view of bench excavation slotted eye in the crosspoint in step 5 of the present invention;
Fig. 6 be the crosspoint in step 6 of the present invention get out of a predicament or an embarrassing situation excavation skewed slot sectional drawing;
Fig. 7 is the sectional drawing performing crosspoint interface collar tie beam in step 6 of the present invention;
Fig. 8 is get out of a predicament or an embarrassing situation the plan view of middle inverted arch in the crosspoint that performs in step 7 of the present invention;
Fig. 9 is the sectional drawing performing lining cutting in the middle of crosspoint in step 8 of the present invention;
Figure 10 is the plan view of the lining cutting of being constructed to both sides by centre, crosspoint in step 9 of the present invention;
Figure 11 is the structural representation completing crosspoint in step 9 of the present invention;
Marginal data: 1-main body station; 2-air channel; 3-preliminary bracing; 4-tops bar in crosspoint left pilot tunnel; 5-tops bar in crosspoint right pilot tunnel; 6-shaped steel temporary support; 7-running tunnel; 8-gets out of a predicament or an embarrassing situation in crosspoint left pilot tunnel; 9-gets out of a predicament or an embarrassing situation in crosspoint right pilot tunnel; 10-collar tie beam; 11-inverted arch; Two linings in the middle of 12-crosspoint.
Detailed description of the invention
The invention provides the construction method in a kind of shallow buried covered excavation cracked rock mass subway tunnel crosspoint, for making object of the present invention, technical scheme and effect clearly, clearly, the present invention is described in more detail below.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides the construction method in a kind of shallow buried covered excavation cracked rock mass subway tunnel crosspoint, as Figure 1-Figure 11, it specifically comprises the following steps:
By main body station 1 to main body station 1 and section excavation middle drift on the crosspoint in air channel 2, enter hole by Pin support type steel door frame 6, construct to headwall, and complete preliminary bracing 3,
Excavated to the left pilot tunnel 4 in air channel 2, right pilot tunnel 5 by middle drift, in time erection median septum temporary support 6, until to make on main body station 1 section on section and air channel 2 through, apply preliminary bracing 3 and close country rock;
Get out of a predicament or an embarrassing situation enter above-mentioned crosspoint from the left pilot tunnel 8 in air channel 2, right pilot tunnel 9 excavation, apply preliminary bracing, when being excavated to headwall, apply headwall supporting;
Top bar from main body station 1 middle drift to excavation crosspoint, headwall direction, erection median septum temporary support 6, is excavated to headwall and completes headwall supporting;
The middle soil body of excavation air channel 2 and interface collar tie beam 10 position, main body station 1, middle bench excavation slotted eye, applies net spray supporting;
Air channel 2 is chosen high section and is got out of a predicament or an embarrassing situation bottom right pilot tunnel 9 and extend out excavation 50cm, frame founds grillage, and every Pin bow member sets four grouting pipe, and applies preliminary bracing, apply bottom ring beam 10 and sidepiece collar tie beam after preliminary bracing completes, then monobloc cast upper ring beam and main body station 1 remain two linings;
Remove crosspoint to get out of a predicament or an embarrassing situation middle temporary support 6, then apply inverted arch lining cutting and inverted arch 11 backfills;
Inverted arch 11 position in the middle of corresponding, step remaining soils in excavation, and the temporary support 6 of removing corresponding median septum of topping bar, complete preliminary bracing, applies lining cutting and connect with collar tie beam 10 is suitable;
After middle two lining 12 final set, excavate and construct near the lining cutting in headwall direction, then apply the lining cutting near Outboard Sections, construction way is the same; Complete the construction at air channel and crosspoint place, main body station.
Further, above-mentioned support type steel door frame adopts hot-rolled steel section manufacture; Above-mentioned preliminary bracing adopts anchor pole and in-network processing; Above-mentioned median septum temporary support 6 adopts hot-rolled steel section; Above-mentioned headwall supporting adopts grid steel frame, slip casting ductule and in-network processing composition; Above-mentioned collar tie beam 10 adopts reinforced concrete structure, and its section configuration is rectangle; Aforementioned body station 1 remains two linings and refers to when applying car body station two lining structure, and reserved two linings near crosspoint, make it and collar tie beam 10 monobloc cast; Above-mentioned inverted arch lining cutting adopts monolithic reinforced concrete structure.
In order to further describe technical scheme of the present invention, below carry out more detailed description.
Main body station 1 total length 176.9m, adopt single arch stalk tunneling section, large arch springing ledge method construction, excavation width is 21.9m, and overall height is 16.2m.Air channel 2 total length is about 35m, and adopt vault stalk section, CRD method is constructed, excavation width 13.6m, high 14.3m.Tunnel cross point top thickness of earth covering is 9 ~ 12m, and country rock is mainly strong weathered granite, and the serious joints development of weathering, Grades of Surrounding Rock is decided to be V grade.
It mainly comprises the following steps:
1), by main body station 1 (now, arch, main body station has been excavated, bottom rock mass does not excavate) to section excavation middle drift on crosspoint, the wide 4m of middle drift, enter hole by Pin support type steel door frame, construct to headwall, and complete preliminary bracing, as shown in Figure 1, preliminary bracing 3 adopts anchor pole and in-network processing.
2), by middle drift to air channel 2 (now, air channel 2 has been excavated, temporary support is not yet removed) point left pilot tunnel 4, right pilot tunnel 5 excavate, timely erection median septum temporary support 6, median septum temporary support 6 adopts hot-rolled steel section, until make by section on section on main body station 1 and air channel 2 through, apply preliminary bracing 3 and close country rock in time, as shown in Figure 2.
3), from the left pilot tunnel in air channel 28, right pilot tunnel 9 excavation get out of a predicament or an embarrassing situation and enter crosspoint, apply preliminary bracing in time, apply headwall supporting in time when being excavated to headwall, as shown in Figure 3, headwall supporting adopts grid steel frame, slip casting ductule and in-network processing.
4), from main body station 1 middle drift top bar to excavation crosspoint, headwall direction, erection median septum temporary support 6, is excavated to headwall and completes headwall supporting, as shown in Figure 4.
5), middle the soil body of excavation air channel 2 and interface collar tie beam 10 position, main body station 1, middle bench excavation 3 × 3m slotted eye, performs net and sprays supporting, as shown in Figure 5.
6), air channel 2 is chosen high section and is got out of a predicament or an embarrassing situation bottom right pilot tunnel 9 and extend out excavation 50cm, frame founds grillage, every Pin bow member sets 4 φ 42 grouting pipe, and apply preliminary bracing, bottom ring beam 10 and sidepiece collar tie beam is performed after preliminary bracing completes, then monobloc cast upper ring beam and main body station 1 remain two linings, as shown in Figure 6, Figure 7, collar tie beam adopts reinforced concrete structure, for square-section, main body station 1 remains two linings and collar tie beam monobloc cast, avoids the generation of constuction joint, guarantees the stability of crosspoint structure.
7), remove crosspoint and to get out of a predicament or an embarrassing situation the wide temporary support 6 of middle 4m, then perform the wide inverted arch lining cutting of 4m and inverted arch 11 backfills, as shown in Figure 8, liner structure adopts monolithic reinforced concrete structure.
8), corresponding in the middle of wide inverted arch 11 position of 4m, the middle step remaining soils that excavation 4m is wide, and remove corresponding median septum temporary support 6 of topping bar, completes preliminary bracing, performs lining cutting and connect with collar tie beam 10 is suitable, as shown in Figure 9.
9), after wide two lining 12 final set of middle 4m, excavate and construct near the lining cutting in headwall direction, then perform the lining cutting near Outboard Sections, construction way is the same, as shown in Figure 10.
10), the entire infrastructure at air channel 2 and crosspoint place, main body station 1 is completed, as shown in figure 11.
Certainly; more than illustrate and be only preferred embodiment of the present invention; the present invention is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the instruction of this manual; made all equivalently to substitute, obvious variant, within the essential scope all dropping on this manual, protection of the present invention ought to be subject to.
Claims (8)
1. the construction method in shallow buried covered excavation cracked rock mass subway tunnel crosspoint, it comprises the following steps:
Step one, by main body station to section excavation middle drift on the crosspoint in main body station and air channel, enters hole by Pin support type steel door frame, constructs to headwall, and complete preliminary bracing;
Step 2, by middle drift to the left pilot tunnel in air channel, right pilot drive, in time erection median septum temporary support, until to make on main body station section on section and air channel through, applies preliminary bracing and closes country rock;
Step 3, from air channel, left pilot tunnel, right pilot drive are got out of a predicament or an embarrassing situation and are entered above-mentioned crosspoint, apply preliminary bracing, when being excavated to headwall, apply headwall supporting;
Step 4, tops bar from main body station middle drift to excavation crosspoint, headwall direction, and erection median septum temporary support, is excavated to headwall and completes headwall supporting;
Step 5, the middle soil body of excavation air channel and interface collar tie beam position, main body station, middle bench excavation slotted eye, applies net spray supporting;
Step 6, air channel choose high section get out of a predicament or an embarrassing situation bottom right side extend out excavation 50cm, frame founds grillage, every Pin bow member sets four grouting pipe, and applying preliminary bracing, apply bottom ring beam and sidepiece collar tie beam after preliminary bracing completes, then monobloc cast upper ring beam and main body station remain two and serve as a contrast;
Step 7, removes crosspoint and to get out of a predicament or an embarrassing situation middle temporary support, then apply inverted arch lining cutting and inverted arch backfill;
Step 8, inverted arch position in the middle of corresponding, step remaining soils in excavation, and the temporary support of removing corresponding median septum of topping bar, complete preliminary bracing, applies lining cutting and connect with collar tie beam is suitable;
Step 9, after middle two lining final set, excavate and construct near the lining cutting in headwall direction, then apply the lining cutting near Outboard Sections, construction way is the same; Complete the construction at air channel and crosspoint place, main body station.
2. construction method according to claim 1, is characterized in that, in described step one, support type steel door frame adopts hot-rolled steel section manufacture.
3. construction method according to claim 1, is characterized in that, the preliminary bracing in described step one adopts anchor pole and in-network processing.
4. construction method according to claim 1, is characterized in that, the median septum temporary support in described step 2 adopts hot-rolled steel section.
5. construction method according to claim 1, is characterized in that, the headwall supporting in described step 3 adopts grid steel frame, slip casting ductule and in-network processing composition.
6. construction method according to claim 1, is characterized in that, the collar tie beam in described step 6 adopts reinforced concrete structure, and its section configuration is rectangle.
7. construction method according to claim 1, is characterized in that, main body station residue two lining in described step 6 refers to when applying car body station two lining structure, and reserved two linings near crosspoint, make it and collar tie beam monobloc cast.
8. construction method according to claim 1, is characterized in that, the inverted arch lining cutting in described step 7 adopts monolithic reinforced concrete structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410401175.3A CN104295301B (en) | 2014-08-14 | 2014-08-14 | The construction method in a kind of shallow buried covered excavation cracked rock mass subway tunnel crosspoint |
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| CN201410401175.3A CN104295301B (en) | 2014-08-14 | 2014-08-14 | The construction method in a kind of shallow buried covered excavation cracked rock mass subway tunnel crosspoint |
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Cited By (6)
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| CN104847366A (en) * | 2015-06-12 | 2015-08-19 | 北京城建设计发展集团股份有限公司 | Low-channel progressive construction tunnel entrance method of subway mined tunnel |
| CN105156114A (en) * | 2015-06-19 | 2015-12-16 | 中国矿业大学 | Enlarging repair and reinforcement method of roadways at crossing |
| CN105156115A (en) * | 2015-08-21 | 2015-12-16 | 中国建筑东北设计研究院有限公司 | Method for constructing small-radius curved sections of S-shaped underground passages |
| CN112576259A (en) * | 2020-12-14 | 2021-03-30 | 中铁二院工程集团有限责任公司 | Main body auxiliary construction method and structure for station by arch cover method |
| CN112576260A (en) * | 2020-12-14 | 2021-03-30 | 中铁二院工程集团有限责任公司 | Arch cover method tunnel entering construction method and arch cover method tunnel entering supporting structure |
| CN114109450A (en) * | 2021-10-20 | 2022-03-01 | 中铁十局集团第一工程有限公司 | Construction method of arch cover type subway station arch springing |
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| CN104847366A (en) * | 2015-06-12 | 2015-08-19 | 北京城建设计发展集团股份有限公司 | Low-channel progressive construction tunnel entrance method of subway mined tunnel |
| CN105156114A (en) * | 2015-06-19 | 2015-12-16 | 中国矿业大学 | Enlarging repair and reinforcement method of roadways at crossing |
| CN105156115A (en) * | 2015-08-21 | 2015-12-16 | 中国建筑东北设计研究院有限公司 | Method for constructing small-radius curved sections of S-shaped underground passages |
| CN105156115B (en) * | 2015-08-21 | 2017-12-05 | 中国建筑东北设计研究院有限公司 | A kind of construction method of S-shaped underpass sharp radius curve section |
| CN112576259A (en) * | 2020-12-14 | 2021-03-30 | 中铁二院工程集团有限责任公司 | Main body auxiliary construction method and structure for station by arch cover method |
| CN112576260A (en) * | 2020-12-14 | 2021-03-30 | 中铁二院工程集团有限责任公司 | Arch cover method tunnel entering construction method and arch cover method tunnel entering supporting structure |
| CN112576259B (en) * | 2020-12-14 | 2022-04-15 | 中铁二院工程集团有限责任公司 | Main body auxiliary construction method and structure for station by arch cover method |
| CN114109450A (en) * | 2021-10-20 | 2022-03-01 | 中铁十局集团第一工程有限公司 | Construction method of arch cover type subway station arch springing |
| CN114109450B (en) * | 2021-10-20 | 2023-05-16 | 中铁十局集团第一工程有限公司 | Construction method of arch cover type subway station arch foot |
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| Publication number | Publication date |
|---|---|
| CN104295301B (en) | 2016-04-27 |
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