CN105625437A - Earth excavation method under annular support of deep foundation pit - Google Patents
Earth excavation method under annular support of deep foundation pit Download PDFInfo
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- CN105625437A CN105625437A CN201610019116.9A CN201610019116A CN105625437A CN 105625437 A CN105625437 A CN 105625437A CN 201610019116 A CN201610019116 A CN 201610019116A CN 105625437 A CN105625437 A CN 105625437A
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- earthwork
- excavation
- trestle
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- foundation ditch
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses an earth excavation method under annular support of a deep foundation pit. The foundation pit is excavated layer by layer in the method; and the excavation in each layer comprises the following steps: 1) part earth on the present layer is excavated; and after the excavation is finished, an annular inner support of the present layer is constructed in the excavated area; 2) center island earth of the present layer is excavated; earth or pond residues are used for forming a projected driving channel in the center island earth excavation process; and the driving channel is connected to the edge of the foundation pit or a trestle; and 3) earth serving as the driving channel is excavated. The method solves the problem of more earth transfer at the middle part of the annular support foundation pit by using a form of arranging the trestle in the center of the foundation pit, and shortens the earth construction period. The excavation technology enables an earth car to directly reach the internal of the foundation pit to excavate any area in excavation of each layer of earth through use of the inclined trestle and backfill of a pond residue road, reduces the muck reshipment times, and largely fastens the excavation speed.
Description
Technical field
The present invention relates to the earthwork digging method under a kind of construction structure, particularly a kind of deep basal pit annular brace.
Background technology
In China's city land plan, the plot of approximating square is in the great majority, and the supported design of going along with sb. to guard him of deep basal pit starts progressively to adopt the internal support of foundation pit system of annular brace in the project under construction of city, current east China soft clay area, because annulus has good stress, compare traditional symmetric support, under same support effect, annular brace cost is lower, and therefore this kind of supporting form will certainly be more universal in downtown area. Under annular brace system, pit earthwork by tau-effect principle stage excavation, first support and dig afterwards, must first carry out arch brace earth excavation, forms the earthwork in excavation annulus after arch brace.
The earth excavation form taked in the deep basal pit of central shoring system at present mainly has following several: a kind of for arranging trestle plate formation annular channels in foundation ditch first annular brace, digging machine carries out excavating in foundation ditch and falls soil, and is unearthed by the platform entrucking of fetching earth stretched in trestle plate. This kind of mode is similar to the excavation method to Deep Foundation Pit Excavation general under support angle support form, but the problem that earthwork distance unearthed point in foundation ditch center is remote, reduce the digging machine number of turnover can not be solved, simultaneously, the method must adopt long-armed digging machine or grab bucket to carry out dress soil when carrying out dell earth excavation, cost is high but effect is slow, additionally, for being primarily subjected in the annular brace of horizontal force additional vertical load, then the comprehensive function lower stress state in both direction power of arch brace certainly will change. Another kind is when annular brace earth excavation, stays and set slight slope to foundation ditch bottom foundation ditch, and earthwork car can pass through the internal dress soil of slight slope entrance foundation ditch, reduces digging machine soil number of times. But this kind of method is integrally formed, because meeting arch brace, the condition that rear is force-applied, after the support zone that slight slope covers must being excavated in advance and constructs before per pass Construction of Supporting, again backfilling this part soil body, just this slight slope available carries out the excavation operation of this layer of earthwork. Therefore this construction method is only applicable to the annular brace engineering that foundation depth is shallower, increase at foundation depth, Site soil poor the method engineering time will increase and extra slight slope can be produced and reinforce expense, the material turnover in follow-up basement structure construction and supporting removal operation and transportation problem can not be solved simultaneously.
Summary of the invention
The present invention provides the earthwork digging method under a kind of deep basal pit annular brace, and the earthwork digging method under this deep basal pit annular brace can solve problems of the prior art.
Technical scheme includes the earthwork digging method under a kind of deep basal pit annular brace, and the method comprises the following steps:
1) the part earthwork of current layer is excavated, at the circular inner support of the region construction current layer excavated after having excavated;
2) excavating the central island earthwork of current layer, utilize the earthwork or pool slag to form prominent driving passage in central excavation island earthwork process, driving passage is connected to margin of foundation pit or trestle;
3) excavation is used as the earthwork of driving passage.
Further improvement is that of earthwork digging method under the deep basal pit annular brace of the present invention: when excavating the ground floor earthwork, the reserved part ground floor earthwork forms the driving passage of ramp shaped, described driving passage is connected to the edge of foundation ditch, and the earthwork of excavation is transported to foundation ditch by passage of driving a vehicle.
Further improvement is that of earthwork digging method under the deep basal pit annular brace of the present invention: when excavating the second layer earthwork, the driving passage of ramp shaped is formed from the side of described foundation ditch to described foundation ditch bottom dump pool slag, described driving passage is connected to the edge of foundation ditch, and the earthwork of excavation is transported to foundation ditch by passage of driving a vehicle.
Further improvement is that of earthwork digging method under the deep basal pit annular brace of the present invention: when excavating the third layer earthwork, the driving passage of ramp shaped is formed from the side of described trestle to described foundation ditch bottom dump pool slag, described driving passage is connected to described trestle, and the earthwork of excavation is transported to foundation ditch by driving passage and trestle.
Further improvement is that of earthwork digging method under the deep basal pit annular brace of the present invention: described trestle includes ramp and levelling bench, and described levelling bench is arranged at the central area bottom foundation ditch; The side of described ramp is connected to described levelling bench, and its opposite side is connected to margin of foundation pit; In the process of the excavation ground floor earthwork and the second layer earthwork, the top of ramp described in section construction; In the process of the excavation third layer earthwork, the bottom of the ramp of construction bridge.
Further improvement is that of earthwork digging method under the deep basal pit annular brace of the present invention: the process of the trestle of every layer comprises the following steps:
1) construction bridge column, described trestle column is shaped steel lattice column;
2) earthwork near excavation trestle plate, builds plain concrete as concrete cushion;
3) building trestle plate, trestle plate is connected to the top of described trestle column;
4) earthwork below excavation trestle plate, and construct between trestle column tie-beam and bridging.
Further improvement is that of earthwork digging method under the deep basal pit annular brace of the present invention: the both sides facility of described trestle plate has anti-collision wall, and described crashproof coping is provided with protective fence.
Further improvement is that of earthwork digging method under the deep basal pit annular brace of the present invention: the upper surface of described trestle plate is provided with tread plate.
The invention has the beneficial effects as follows: adopt the form that trestle is set to foundation ditch center, solve the problem that in the middle part of annular brace foundation ditch, earthwork turnover is many, shorten the earth work duration. This excavation technology is by adopting oblique trestle and being equipped with backfill pool slag road, and when making every layer of earth excavation, earthwork car all can directly go deep into the arbitrary region of the internal digging machine excavation of foundation ditch, reduces dregs and has bad luck number of times, greatly speeds up unearthed speed. Whole earth work only can complete by common model digging machine, has to use for long-armed digging machine or grab bucket without adopting in deep foundation pit construction, and machine cost input is significantly reduced also improves excavation effect simultaneously. In this invention, trestle design disengages with annular brace system, it is ensured that will not change the stress of annular brace in trestle use procedure, compare the earthwork digging method under other central shorings safer.
Accompanying drawing explanation
Fig. 1 to Fig. 3 is the digging process of the ground floor earthwork in foundation ditch;
Fig. 4 to Fig. 6 is the digging process of the ground floor earthwork in foundation ditch;
Fig. 7 to Fig. 9 is the digging process of the ground floor earthwork in foundation ditch;
Figure 10 to Figure 11 is the digging process of the ground floor earthwork in foundation ditch; And
Figure 12 is the side view of the trestle in the present invention.
Detailed description of the invention
Below by way of specific instantiation, embodiments of the present invention being described, those skilled in the art the content disclosed by this specification can understand other advantages and effect of the present invention easily. The present invention can also be carried out by additionally different detailed description of the invention or apply, and the every details in this specification based on different viewpoints and application, can also carry out various modification or change under the spirit without departing from the present invention.
Foundation ditch is successively excavated by the earthwork digging method under the deep basal pit annular brace of the present invention, digs process below according to what every layer of earthwork introduced by accompanying drawing.
As shown in Figure 1 to Figure 3, the digging process of the ground floor earthwork of foundation ditch comprises the following steps:
The marginal portion of excavation ground floor, at the circular inner support 10 of the region construction ground floor excavated after having excavated.
The central island earthwork 11 of excavation ground floor, utilizes original cubic metre of earth in foundation ditch to form prominent driving passage 12 in the central excavation island earthwork 11 process, and driving passage 12 is connected to the edge of foundation ditch. In the process of the central excavation island earthwork 11, earthwork car 14 enters inside foundation ditch by passage 12 of driving a vehicle, and is positioned at the excavator 13 within foundation ditch and the earthwork is loaded to earthwork car 14, and the earthwork is transported by earthwork car 14 from driving passage 12.
After the earth excavation of central island 11 becomes, progressively excavation is used as the earthwork of driving passage 12.
As shown in Figures 4 to 6, the digging process of the second layer earthwork of foundation ditch comprises the following steps:
The marginal portion of the excavation second layer, at the circular inner support 20 of the region construction second layer excavated and trestle 25 after having excavated.
The central island earthwork 21 of the excavation second layer, forms the driving passage 22 of ramp shaped in the central excavation island earthwork 21 process from the side of described foundation ditch to described foundation ditch bottom dump pool slag, and driving passage 22 is connected to the edge of foundation ditch. In the process of the central excavation island earthwork 21, earthwork car 24 enters inside foundation ditch by passage 22 of driving a vehicle, and is positioned at the excavator 23 within foundation ditch and the earthwork is loaded to earthwork car 24, and the earthwork is transported by earthwork car 24 from driving passage 22.
After the earth excavation of central island 21 becomes, progressively excavation is used as the earthwork of driving passage 22.
As shown in Figure 7 to 9, the digging process of the third layer earthwork of foundation ditch comprises the following steps:
The marginal portion of excavation third layer and core, at the circular inner support 30 of the marginal area construction third layer excavated and trestle 35 after having excavated.
The central island earthwork 31 of excavation third layer, forms the driving passage 32 of ramp shaped in the central excavation island earthwork 31 process from the side of built trestle 35 to described foundation ditch bottom dump pool slag, and driving passage 32 is connected to driving passage. In the process of the central excavation island earthwork 31, earthwork car enters inside foundation ditch by passage 32 of driving a vehicle, and is positioned at the excavator within foundation ditch and loads the earthwork to earthwork car, and the earthwork is transported by earthwork car from driving passage 32 and trestle 35.
After the earth excavation of central island 31 becomes, progressively excavation is used as the earthwork of driving passage 32.
As shown in Figure 10 to Figure 11, the digging process of the 4th layer of earthwork of foundation ditch comprises the following steps:
Levelling bench 46 at the bottom construction bridge of trestle. Levelling bench 46 constructed after from the side of built levelling bench 46 to described foundation ditch bottom dump pool slag formed ramp shaped driving passage 42, in the process of the 4th layer of earthwork of excavation, earthwork car enters inside foundation ditch by passage 42 of driving a vehicle, being positioned at the excavator within foundation ditch to load the earthwork to earthwork car, the earthwork is transported by earthwork car from driving passage 42 and trestle.
As shown in FIG. 11 and 12, trestle includes ramp 47 and levelling bench 46. Levelling bench 46 is arranged at the central area bottom foundation ditch; The side of ramp 47 is connected to levelling bench 46, and its opposite side is connected to margin of foundation pit. There is seam between top and the circular inner support of ramp 47, the load of ramp 47 carrying will not be transferred to circular inner support, and the load that therefore ramp 47 bears is without influence on the stress of circular inner support. In the process of the excavation second layer earthwork, the top of section construction ramp 47; In the process of the excavation third layer earthwork, the bottom of construction ramp 47. Levelling bench 46 is constructed in the digging process of the 4th layer.
The work progress of trestle comprises the following steps: first construction bridge column 51, and trestle column 51 is shaped steel lattice column. Trestle column 51 adopts cast-in-situ bored pile form, single-column single pile, and the cast-in-situ bored pile degree of depth, according to foundation ditch locality soil layer mechanical characteristic, meets bearing capacity of single pile requirement. Trestle column 51 excavates the earthwork near trestle plate after having constructed, and builds plain concrete as concrete cushion. Building trestle plate, trestle plate is connected to the top of described trestle column 51. The finally earthwork below excavation trestle plate, and construct between trestle column 51 tie-beam 52 and bridging 54. The both sides facility of trestle plate has anti-collision wall, and described crashproof coping is provided with protective fence. The upper surface of trestle plate is provided with tread plate.
The invention has the beneficial effects as follows: adopt the form that trestle is set to foundation ditch center, solve the problem that in the middle part of annular brace foundation ditch, earthwork turnover is many, shorten the earth work duration. This excavation technology is by adopting oblique trestle and being equipped with backfill pool slag road, and when making every layer of earth excavation, earthwork car all can directly go deep into the arbitrary region of the internal digging machine excavation of foundation ditch, reduces dregs and has bad luck number of times, greatly speeds up unearthed speed. Whole earth work only can complete by common model digging machine, has to use for long-armed digging machine or grab bucket without adopting in deep foundation pit construction, and machine cost input is significantly reduced also improves excavation effect simultaneously. In this invention, trestle design disengages with annular brace system, it is ensured that will not change the stress of annular brace in trestle use procedure, compare the earthwork digging method under other central shorings safer.
The above is only presently preferred embodiments of the present invention, not the present invention is done any pro forma restriction, although the present invention is disclosed above with preferred embodiment, but it is not limited to the present invention, any those skilled in the art, without departing from the scope of technical solution of the present invention, when the technology contents of available the disclosure above makes a little change or is modified to the Equivalent embodiments of equivalent variations, in every case it is the content without departing from technical solution of the present invention, according to any simple modification that above example is made by the technical spirit of the present invention, equivalent variations and modification, all still fall within the scope of technical solution of the present invention.
Claims (8)
1. the earthwork digging method under a deep basal pit annular brace, it is characterised in that foundation ditch is successively excavated, and every layer of process of digging comprises the following steps:
1) the part earthwork of current layer is excavated, at the circular inner support of the region construction current layer excavated after having excavated;
2) excavating the central island earthwork of current layer, utilize the earthwork or pool slag to form prominent driving passage in central excavation island earthwork process, driving passage is connected to margin of foundation pit or trestle;
3) excavation is used as the earthwork of driving passage.
2. the earthwork digging method under deep basal pit annular brace as claimed in claim 1, it is characterized in that: when excavating the ground floor earthwork, the reserved part ground floor earthwork forms the driving passage of ramp shaped, described driving passage is connected to the edge of foundation ditch, and the earthwork of excavation is transported to foundation ditch by passage of driving a vehicle.
3. the earthwork digging method under deep basal pit annular brace as claimed in claim 1, it is characterized in that: when excavating the second layer earthwork, the driving passage of ramp shaped is formed from the side of described foundation ditch to described foundation ditch bottom dump pool slag, described driving passage is connected to the edge of foundation ditch, and the earthwork of excavation is transported to foundation ditch by passage of driving a vehicle.
4. the earthwork digging method under deep basal pit annular brace as claimed in claim 1, it is characterized in that: when excavating the third layer earthwork, the driving passage of ramp shaped is formed from the side of trestle to described foundation ditch bottom dump pool slag, described driving passage is connected to described trestle, and the earthwork of excavation is transported to foundation ditch by driving passage and trestle.
5. the earthwork digging method under deep basal pit annular brace as described in any one in Claims 1-4, it is characterised in that: described trestle includes ramp and levelling bench, and described levelling bench is arranged at the central area bottom foundation ditch; The side of described ramp is connected to described levelling bench, and its opposite side is connected to margin of foundation pit; In the process of the excavation second layer earthwork, the top of described ramp of constructing; In the process of the excavation third layer earthwork, the bottom of the ramp of construction bridge.
6. the earthwork digging method under deep basal pit annular brace as claimed in claim 5, it is characterised in that the process of the trestle of every layer comprises the following steps:
1) construction bridge column, described trestle column is shaped steel lattice column;
2) earthwork near excavation trestle plate, builds plain concrete as concrete cushion;
3) building trestle plate, trestle plate is connected to the top of described trestle column;
4) earthwork below excavation trestle plate, and construct between trestle column tie-beam and bridging.
7. the earthwork digging method under deep basal pit annular brace as claimed in claim 6, it is characterised in that: the both sides facility of described trestle plate has anti-collision wall, and described crashproof coping is provided with protective fence.
8. the earthwork digging method under deep basal pit annular brace as claimed in claim 6, it is characterised in that: the upper surface of described trestle plate is provided with tread plate.
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| CN201610019116.9A CN105625437B (en) | 2016-01-13 | 2016-01-13 | Earthwork digging method under deep basal pit annular brace |
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| CN201610019116.9A CN105625437B (en) | 2016-01-13 | 2016-01-13 | Earthwork digging method under deep basal pit annular brace |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106245677A (en) * | 2016-08-01 | 2016-12-21 | 中国建筑第八工程局有限公司 | The construction method of the Group Buildings underground space |
| CN109295983A (en) * | 2018-08-07 | 2019-02-01 | 中铁上海工程局集团有限公司 | Deep foundation pit earthwork digging construction method under a kind of large diameter circle truss support environment |
| CN109469073A (en) * | 2018-11-13 | 2019-03-15 | 上海建工五建集团有限公司 | Sliding slot equipment and its construction method, the construction method of stemming operation |
| CN109610464A (en) * | 2018-11-27 | 2019-04-12 | 中铁局集团有限公司第三工程分公司 | Haul operating platform and its construction method under a kind of foundation pit cross-operation environment |
| CN109680691A (en) * | 2018-12-25 | 2019-04-26 | 三箭建设工程集团有限公司 | The earthwork digging method of foundation pit annular brace |
| CN109930608A (en) * | 2019-03-05 | 2019-06-25 | 云南建投第十二建设有限公司 | A kind of pit earthwork excavation method of peat matter weak soil |
| CN112796325A (en) * | 2021-02-01 | 2021-05-14 | 中建三局集团有限公司 | Double-deck trestle type reverse construction method |
| CN113502824A (en) * | 2021-07-08 | 2021-10-15 | 中国建筑第八工程局有限公司 | Construction method for quickly unearthing annular road in deep foundation pit by combining trestle with construction method |
| CN113653062A (en) * | 2021-08-16 | 2021-11-16 | 中国建筑第八工程局有限公司 | Construction method for quickly unearthing deep foundation pit by utilizing trestle to combine with road in pit |
| CN113668548A (en) * | 2021-07-28 | 2021-11-19 | 中国建筑一局(集团)有限公司 | Narrow foundation pit ramp supporting structure and construction method |
| CN114032910A (en) * | 2021-07-28 | 2022-02-11 | 中国建筑一局(集团)有限公司 | Narrow foundation pit ramp structure and unearthing method using same |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106245677B (en) * | 2016-08-01 | 2018-06-26 | 中国建筑第八工程局有限公司 | The construction method of the Group Buildings underground space |
| CN106245677A (en) * | 2016-08-01 | 2016-12-21 | 中国建筑第八工程局有限公司 | The construction method of the Group Buildings underground space |
| CN109295983A (en) * | 2018-08-07 | 2019-02-01 | 中铁上海工程局集团有限公司 | Deep foundation pit earthwork digging construction method under a kind of large diameter circle truss support environment |
| CN109469073A (en) * | 2018-11-13 | 2019-03-15 | 上海建工五建集团有限公司 | Sliding slot equipment and its construction method, the construction method of stemming operation |
| CN109469073B (en) * | 2018-11-13 | 2024-01-05 | 上海建工五建集团有限公司 | Chute equipment and construction method thereof, and construction method of backfilling engineering |
| CN109610464B (en) * | 2018-11-27 | 2020-10-20 | 中铁一局集团有限公司第三工程分公司 | Material transporting operation platform in foundation pit cross operation environment and construction method thereof |
| CN109610464A (en) * | 2018-11-27 | 2019-04-12 | 中铁局集团有限公司第三工程分公司 | Haul operating platform and its construction method under a kind of foundation pit cross-operation environment |
| CN109680691B (en) * | 2018-12-25 | 2021-04-06 | 三箭建设工程集团有限公司 | Earth excavation method for annular support of foundation pit |
| CN109680691A (en) * | 2018-12-25 | 2019-04-26 | 三箭建设工程集团有限公司 | The earthwork digging method of foundation pit annular brace |
| CN109930608A (en) * | 2019-03-05 | 2019-06-25 | 云南建投第十二建设有限公司 | A kind of pit earthwork excavation method of peat matter weak soil |
| CN112796325A (en) * | 2021-02-01 | 2021-05-14 | 中建三局集团有限公司 | Double-deck trestle type reverse construction method |
| CN113502824A (en) * | 2021-07-08 | 2021-10-15 | 中国建筑第八工程局有限公司 | Construction method for quickly unearthing annular road in deep foundation pit by combining trestle with construction method |
| CN113668548A (en) * | 2021-07-28 | 2021-11-19 | 中国建筑一局(集团)有限公司 | Narrow foundation pit ramp supporting structure and construction method |
| CN114032910A (en) * | 2021-07-28 | 2022-02-11 | 中国建筑一局(集团)有限公司 | Narrow foundation pit ramp structure and unearthing method using same |
| NL2031687A (en) * | 2021-07-28 | 2022-06-27 | China Construction First Group South China Corp Co Ltd | Ramp Supporting Structure and Construction Method of Narrow Foundation Pit |
| CN114032910B (en) * | 2021-07-28 | 2023-10-03 | 中建一局集团华南建设有限公司 | Narrow foundation pit ramp structure and soil discharging method using same |
| CN113653062A (en) * | 2021-08-16 | 2021-11-16 | 中国建筑第八工程局有限公司 | Construction method for quickly unearthing deep foundation pit by utilizing trestle to combine with road in pit |
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