CN111576435B - Construction method and structure of column control slip surface of inter-pile soil steel structure - Google Patents
Construction method and structure of column control slip surface of inter-pile soil steel structure Download PDFInfo
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- CN111576435B CN111576435B CN202010305379.2A CN202010305379A CN111576435B CN 111576435 B CN111576435 B CN 111576435B CN 202010305379 A CN202010305379 A CN 202010305379A CN 111576435 B CN111576435 B CN 111576435B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 49
- 239000010959 steel Substances 0.000 title claims abstract description 49
- 238000010276 construction Methods 0.000 title claims abstract description 46
- 239000002689 soil Substances 0.000 title claims abstract description 31
- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 239000004567 concrete Substances 0.000 claims description 20
- 238000005553 drilling Methods 0.000 claims description 19
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 238000007788 roughening Methods 0.000 claims description 2
- 238000004080 punching Methods 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 abstract description 8
- 238000009412 basement excavation Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 239000007787 solid Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 abstract 2
- 239000011440 grout Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0006—Plastics
- E02D2300/0007—PVC
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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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)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a construction method and a structure of a column control slip surface of an earth steel structure between piles. The solid pile with the thickness of 1m is arranged at the soft and hard interface position of the soil layer to play a role of a support, the crown beam is used as a support at the other end, and a steel reinforcement framework is immediately placed after grouting is finished, so that the effect of stabilizing soil among piles is realized, the space slip surface of the soil arch is cut off in a 'stabilizing' mode of the soil steel constructional column among piles, the failure of the soil arch is limited, the load of the soil arch is shared, and the foundation pit excavation engineering quality and safety are improved. Meanwhile, the monitoring is enhanced at the crown beam part of the support pile, the safety is guaranteed, and the method can be widely applied to underground space development foundation pit construction.
Description
Technical Field
The invention relates to a construction method and a structure of a column control slip surface of an earth steel structure between piles.
Background
During foundation pit supporting, the underground pipelines and other reasons are not considered in some sections, and the space evolution process of the soil arch effect is not considered, so that the distance between piles is large, and the phenomenon can have great influence on the safety construction of the foundation pit. It is common practice to perform pile repair or grouting reinforcement between piles, but such methods are often performed afterwards and are extremely uneconomical. Even in this case, the problem of the safety of the foundation pit cannot be completely solved, and a technology for solving such problem is needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a construction method and a structure of a column control sliding surface of an earth steel construction between piles, and ensuring the safe construction of a foundation pit.
In order to solve the technical problem, the invention provides a construction method of a pile control slip plane of an earth steel structure between piles, which comprises the following steps,
a. and (3) supporting pile construction:
adopting reinforced concrete cast-in-place piles as support piles at two sides of the foundation pit;
b. construction of a crown beam:
after the strength of the supporting piles meets the requirement and the pile body is qualified through inspection, roughening the concrete surface of the top of the supporting pile, connecting the reinforcing steel bars at the top of the supporting pile with the reinforcing steel bars of the crown beam, pouring a crown beam cushion layer, embedding PVC pipes on the crown beam and between adjacent supporting piles at corresponding positions to serve as channels for steel construction column construction (the PVC pipes are vertically arranged, the length of the PVC pipes is not less than the thickness of the crown beam), pouring the concrete of the crown beam, and after the crown beam concrete is poured, performing film-covering maintenance on the concrete,
c. construction of the steel constructional column:
after the strength of the crown beam meets the requirement and the pile body is qualified through inspection, a high-pressure jet drilling machine is adopted to drill holes according to the positions of the pre-buried PVC pipes, the drilling depth is required to be deep into a soft and hard interface of a foundation pit soil layer for at least 1m, reinforcing steel bars with the lengths matched with the hole depths are inserted into the holes to serve as frameworks of the steel construction columns after the drilling is completed, and then cement slurry is filled into the holes to form the steel construction columns.
In the embodiment, in the step a, the supporting piles are beaten at intervals when being punched, the hole forming diameter of the supporting pile hole is not less than the diameter of the supporting pile, the hole position deviation of the supporting pile is less than or equal to +/-5 cm, and the verticality deviation is less than or equal to 1%.
In the embodiment, in the step a, the section supporting pile holes of the pebble layer and the silt silty clay are punched by steel casing cylinders.
In the step c, the high-pressure rotary jet drilling machine corrects the drilling position by using a horizontal ruler after being in place, so that the hole position deviation is less than or equal to +/-5 cm, and the verticality deviation is less than or equal to 1%.
In the present embodiment, after step c, a plurality of displacement sensors for detecting the level of the support piles are provided on the crown beam in the longitudinal direction of the crown beam as monitoring points.
This embodiment still includes a soil steel constructional column fixed knot between stake constructs post, including supporting the fender pile in the foundation ditch both sides and setting up the guan liang at a fender pile top, the soft or hard interface position of foundation ditch soil layer between adjacent fender pile sets up the real stake as first support of deepening 1 meter underground at least, guanliang is the second support, has laid the steel constructional column perpendicularly between the adjacent fender pile, steel constructional column one end is fixed with first support, and the other end is fixed with the second support.
In this embodiment, the steel structure column is a high-pressure jet grouting pile with a steel reinforcement framework arranged therein.
In the present embodiment, the diameter of the steel structural column is 200 mm.
By adopting the construction method and the structure, the invention has the following advantages:
(1) the foundation pit support is safe, the construction quality is good,
by adopting the inter-pile soil steel column construction technology, the large-area slippage of earthwork is controlled, the stress concentration is reduced in a stable mode of the steel column construction, and then the inter-pile soil and the earthwork behind the supporting pile are consolidated and supported, the deformation of the supporting pile due to the cracking of the earthwork is limited, the foundation pit excavation engineering quality is improved, and the construction safety of the foundation pit is guaranteed.
(2) The operation is simple and convenient, the popularization is strong,
during construction, steel construction columns are arranged among the piles, and conventional equipment and common materials are adopted. Simple and easy operation and strong popularization.
(3) The social and economic benefits are good,
adopt pile-to-pile soil steel column construction technique in the excavation supporting, compare the traditional mode of mending the stake, practiced thrift a large amount of economic cost. And the technology avoids soil slippage between piles, concretes soil body, improves the supporting quality and reduces the later repair cost.
In conclusion, the invention cuts off the soil arch space slip plane in a 'stable' mode of the inter-pile soil steel constructional column, limits the soil arch failure and shares the soil arch load, and improves the foundation pit excavation engineering quality and safety. Meanwhile, the monitoring is enhanced at the crown beam part of the support pile, and the safety is guaranteed. The invention can be widely applied to all foundation pit constructions developed in underground space.
Drawings
FIG. 1 is a schematic view of the construction of the present invention.
FIG. 2 is a schematic view of the high pressure jet grouting drilling machine of the invention for drilling holes.
In the attached drawing, 1, a crown beam, 2, a solid pile, 3, a steel construction column, 4, a support pile and 5 are high-pressure rotary jet drilling machines.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
Example 1:
as shown in fig. 1 and 2, a construction method of a pile-to-pile soil steel construction column control slip surface comprises the following steps,
(1) and (3) supporting pile construction:
according to the geological survey report data and the actual geological data of the combined site, the foundation pit adopts a support mode that reinforced concrete cast-in-place piles are used as support piles, and the foundation pit is driven at intervals during construction. The diameter of the formed hole of the support pile is not less than the designed pile diameter, the deviation of the hole position is less than or equal to +/-5 cm, and the deviation of the verticality is less than or equal to 1%. And (3) manufacturing the reinforcement cage in the support pile in a segmented manner, wherein the segmented length is determined according to the factors such as the integral rigidity of the reinforcement cage, the length of the reinforcement and hoisting equipment. The joint of the reinforcement cage adopts a welding mode and is staggered with each other. The concrete for the support pile has good workability, and the slump is preferably 180-220 mm. The supporting pile needs to be continuously poured with underwater concrete, the rising condition of the concrete surface is often detected, the pouring time is required to ensure that the concrete is not initially set, and the height of over pouring is required to be more than 1.0m higher than the elevation of the designed pile top.
And constructing sections with thick gravel layers, silt silty clay and backfill soil by adopting steel casing so as to prevent the piles from being perforated and pulled out after concrete is poured.
(2) Construction of a crown beam:
chiseling out the laitance of the top of the supporting pile, fully chiseling the concrete surface of the top of the supporting pile, aligning the top of the supporting pile to reserve a reinforcing steel bar, embedding the reinforcing steel bar into a crown beam mould, pouring a crown beam cushion layer, and reserving a PVC pipe with the preset diameter of 200mm between adjacent supporting piles after leveling to serve as a channel for steel construction column construction. And finally, pouring the crown beam concrete, wherein the concrete is vibrated by adopting an inserted vibrating rod when being poured, and the vibration must be dense. And after the concrete is poured, timely covering or watering the concrete for maintenance according to the weather condition. The curing time is not less than 14 days.
(3) Construction of the steel constructional column:
before the drilling machine is in place, the site is repaired to be flat, the drilling machine is stably installed on the designed hole site after being in place, and the horizontal ruler is used for correcting. Then adjusting the vertical shaft and the trolley of the drilling machine to enable the vertical shaft and the trolley to be in line with three points at the center of the hole site, and ensuring that the deviation of the hole site is less than or equal to +/-5 cm and the deviation of the verticality is less than or equal to 1 percent.
Drilling machine operators need to skillfully master related technical parameters to drill holes, the aperture is phi 200mm, the drilling depth needs to be deep into the soft and hard interface of the foundation pit soil layer by at least 1 meter, the related technical parameters are timely adjusted according to the hole depth and the change of the conditions in the holes under the guidance of field constructors and technicians, and the specific gravity of slurry feeding and slurry returning is measured at regular time. The rotary spraying machine needs to spray grout while inserting a pipe, and the grout pressure is controlled below 1 Mpa. The concrete nozzle must be positioned to reach the drilling depth, so that a solid pile with the length of at least 1 meter is formed at the soft and hard interface of the foundation pit and the soil layer. According to the hole depth, a steel bar with the diameter of 32mm is quickly inserted to serve as a framework of the constructional column, the two ends of the solid pile 2 and the two ends of the crown beam 1 serve as anchoring ends to form a steel constructional column 3, grout in the hole is precipitated and solidified, the top surface of the grout continuously descends, cement grout needs to be continuously backfilled into the hole to guarantee the effective height of the anchoring ends of the steel constructional column, the steel constructional column is used for consolidating soil around the pile, and the slippage of soil between piles is controlled.
(6) Monitoring point setting
And a displacement sensor is arranged on the crown beam at a distance of 20m and serves as a monitoring point for monitoring the horizontal and vertical displacement of the support pile, and the measurement is carried out every 3 days, so that the safety of the foundation pit is guaranteed.
Example 2:
form a pile-to-pile soil steel constructional column fixed knot structure after constructing through embodiment 1, the soft or hard interface place position of foundation ditch soil layer between adjacent fender pile sets up real stake as first support, will guan liang be the second support, establishes the steel constructional column between the adjacent fender pile perpendicularly laid, steel constructional column one end is fixed with first support, and the other end is fixed with the second support, the steel constructional column is equipped with steel reinforcement framework's high pressure jet grouting pile in for, the diameter of steel constructional column is 200 mm.
Claims (5)
1. A construction method of a column control slip surface of an inter-pile soil steel structure is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
a. and (3) supporting pile construction:
adopting reinforced concrete cast-in-place piles as support piles at two sides of the foundation pit;
b. construction of a crown beam:
after the strength of the supporting piles meets the requirement and the pile body is qualified through inspection, roughening the concrete surface of the top of the supporting pile, connecting the reinforcing steel bars at the top of the supporting pile with the reinforcing steel bars of the crown beam, pouring a crown beam cushion layer, embedding PVC pipes on the crown beam and between adjacent supporting piles at corresponding positions to serve as channels for steel construction column construction, pouring concrete of the crown beam, and after the crown beam concrete is poured, performing film covering maintenance on the concrete,
c. construction of the steel constructional column:
after the strength of the crown beam meets the requirement and the pile body is qualified through inspection, a high-pressure jet drilling machine is adopted to vertically drill holes according to the positions of the pre-buried PVC pipes, the drilling depth is required to be deep into the lower portion of a soft and hard interface of a foundation pit soil layer for at least 1m, reinforcing steel bars with the lengths matched with the hole depths are inserted into the holes to serve as frameworks of the steel constructional column after the drilling is completed, and then cement slurry is backfilled into the holes to form the steel constructional column.
2. The construction method of the column control slip surface of the earth steel structure between piles according to claim 1, characterized in that: in the step a, the supporting piles are beaten at intervals during punching, the hole forming diameter of the supporting pile hole is not less than the diameter of the supporting pile, the hole position deviation of the supporting pile is less than or equal to +/-5 cm, and the verticality deviation is less than or equal to 1%.
3. The construction method of the column control slip surface of the earth steel structure between piles according to claim 1, characterized in that: in the step a, a steel casing is adopted to punch holes in supporting pile holes of sections of pebble layers and silt silty clay.
4. The construction method of the column control slip surface of the earth steel structure between piles according to claim 1, characterized in that: and c, after the high-pressure rotary jet drilling machine is in place, correcting the drilling position by using a horizontal ruler, and ensuring that the deviation of the hole position is less than or equal to +/-5 cm and the deviation of the verticality is less than or equal to 1%.
5. The construction method of the column control slip surface of the earth steel structure between piles according to claim 1, characterized in that: and c, arranging a plurality of displacement sensors for detecting the horizontal of the support piles on the crown beam along the length direction of the crown beam as monitoring points.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010305379.2A CN111576435B (en) | 2020-04-17 | 2020-04-17 | Construction method and structure of column control slip surface of inter-pile soil steel structure |
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| CN202010305379.2A CN111576435B (en) | 2020-04-17 | 2020-04-17 | Construction method and structure of column control slip surface of inter-pile soil steel structure |
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| CN111576435B true CN111576435B (en) | 2021-09-24 |
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| KR101159755B1 (en) * | 2008-08-29 | 2012-06-28 | 주식회사 이엔지건설엔지니어링 | Finishing block and Retaining wall using the same |
| CN202543946U (en) * | 2012-04-24 | 2012-11-21 | 中国水电顾问集团华东勘测设计研究院 | Supporting structure for drainage type fender posts in soft soil area |
| CN104532851B (en) * | 2014-12-17 | 2017-01-11 | 北京工业大学 | Recycling assembling type double-row pile and supporting method thereof |
| CN105089061B (en) * | 2015-08-11 | 2017-01-18 | 泰兴市第一建筑安装工程有限公司 | Ultra-deep foundation pit supporting method |
| CN107288135A (en) * | 2017-07-19 | 2017-10-24 | 昆明理工大学 | A kind of inter-pile soil reinforcement means of foundation ditch Double-row Piles Support |
| CN108005084A (en) * | 2017-11-29 | 2018-05-08 | 杭州江润科技有限公司 | The supporting of deep basal pit combined type and construction method |
| CN108951653B (en) * | 2018-08-10 | 2020-10-16 | 济南城建集团有限公司 | Foundation pit row pile supporting pile soil reinforcing method |
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