CN109403354B - Construction method for deep foundation pit support of inverted retaining wall of cyclone well - Google Patents
Construction method for deep foundation pit support of inverted retaining wall of cyclone well Download PDFInfo
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- CN109403354B CN109403354B CN201811420916.7A CN201811420916A CN109403354B CN 109403354 B CN109403354 B CN 109403354B CN 201811420916 A CN201811420916 A CN 201811420916A CN 109403354 B CN109403354 B CN 109403354B
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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
- E02D17/06—Foundation trenches ditches or narrow shafts
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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
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/125—Manhole shafts; Other inspection or access chambers; Accessories therefor characterised by the lining of the shaft
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F5/0401—Gullies for use in roads or pavements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0007—Production methods using a mold
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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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)
- Health & Medical Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention relates to the field of building construction, in particular to a construction method for a deep foundation pit support with an inverted retaining wall of a cyclone well, which comprises the following steps: 1) measuring and positioning the paying-off, and manufacturing a steel mould; 2) breaking the underground concrete and other obstacles; 3) checking well positions, marking and excavating soil for the first time; 4) binding reinforcing steel bars, driving the reinforcing steel bars into a wall-hanging reinforcing steel bar, and erecting a formwork; 5) pouring a first layer of retaining wall concrete; 6) installing an electric single-beam crane; 7) digging a next section of soil, and binding reinforcing steel bars; 8) after the first layer of concrete is cured, slowly putting down the steel mould by using an electric single-beam crane; 9) pouring retaining wall concrete; 10) circularly repeating the steps 7) to 9) until the excavated soil reaches the designed elevation, hoisting out the excavator through a crane, dismantling the steel mould and hoisting out the steel mould through the electric single-beam crane in sections, and then pouring a bottom cushion layer of the shaft; the invention greatly improves the construction efficiency, reduces the labor intensity and has no influence on the surrounding environment.
Description
Technical Field
The invention relates to the field of building construction, in particular to a construction method for a deep foundation pit support with an inverted retaining wall of a cyclone well.
Background
The pit with the excavation depth exceeding 5m in the building engineering is a deep foundation pit, a foundation pit retaining wall needs to be supported in the deep foundation pit construction operation, and the existing supporting mode has the following types: one is slope-releasing spray surface support, the construction is simple, safe and reliable, but the surrounding environment needs to be destroyed, and the support is only suitable for foundation pits below 5-6 meters; one is pile top relief slope and cantilever pile arrangement support, the construction period is long, the construction cost is high, and when artificial piles are adopted, construction cannot be carried out if underground obstacles and the pile foundation of a rock layer of a middle wind formation are met; the foundation pit with the depth of more than 10 meters is generally constructed by a reverse construction method, the construction process of the existing deep foundation pit with the large caliber and the depth of more than 10 meters greatly depends on manual operation, the labor intensity is high, the construction period is long, and the construction efficiency is low.
Disclosure of Invention
The invention aims to solve the problems of large labor intensity, long construction period and low construction efficiency due to the fact that a large amount of manual operation is relied on in the construction process of a deep foundation pit with a large caliber and a depth of more than 10 meters, and provides a construction method for a deep foundation pit support with an inverted retaining wall of a cyclone well.
The specific scheme of the invention is as follows: a construction method for a deep foundation pit support with an inverted hanging retaining wall of a cyclone well comprises the following steps:
1) measuring and positioning paying-off, and manufacturing a steel die: manufacturing a steel mould according to the diameter of the cyclone well, wherein the steel mould is formed by splicing a plurality of sections of wall protecting templates, each section of wall protecting template comprises two sections of arc-shaped flat plates with the diameter matched with that of the cyclone well, a vertical arc-shaped coil plate is welded between the two sections of arc-shaped flat plates, and the height of the arc-shaped coil plate is determined according to the height of the cyclone well;
2) breaking the underground concrete and other obstacles;
3) inspecting well positions, marking, excavating soil for the first time: the excavator enters the well to dig a first section of soil, and the digging height is the same as the height of the steel die;
4) binding reinforcing steel bars, driving in wall-hanging reinforcing steel bars, erecting a formwork: manufacturing and installing a double-layer bidirectional reinforcing mesh along the circumference of the inner wall of the well, and placing a steel mould into the well and positioning the steel mould at the inner side of the reinforcing mesh;
5) pouring a first layer of retaining wall concrete: pouring a circle of concrete into the steel bar net on the periphery of the steel mould to form a first layer of retaining wall structure;
6) installing an electric single-beam crane: two steel upright posts are arranged on the reinforced concrete surface at the top of the cyclone well, a triangular truss striding over the cyclone well is arranged at the top of each steel upright post, an I-shaped steel track beam is arranged below the truss, and a hoisting mechanism capable of moving along the I-shaped steel track beam is arranged on the I-shaped steel track beam;
7) digging the next section of soil, and binding reinforcing steel bars: a jack is arranged at the bottom of the steel mould to support the steel mould in the process of curing the first layer of concrete 1, then an excavator excavates a layer of soil, the excavation height is the same as the height of the steel mould, the excavated soil pile is hoisted out through an electric single beam, and a double-layer bidirectional reinforcing mesh is manufactured after the excavation is finished;
8) after the first layer of concrete is cured, hanging a steel wire rope on the steel mould, hoisting the steel mould by using an electric single-beam crane, and slowly putting down the steel mould after a jack is detached;
9) pouring the concrete for the retaining wall: pouring a circle of concrete into the steel bar net on the periphery of the steel mould to form a second-layer retaining wall structure;
10) and (5) repeating the steps 7) to 9) in a circulating manner until the soil is excavated to the designed elevation, then hoisting the excavator out through a crane, dismantling the steel mould and hoisting out through the electric single-beam crane in sections, and then pouring the bottom cushion layer.
The top of the first layer of breast wall concrete is provided with a circle of annular track at the inner sides of two upright posts of an electric single-beam crane, the annular track is provided with a pouring device moving along the annular track, the pouring device comprises a feed hopper, a support plate spanning the annular track is welded on the feed hopper, an upright post is welded at the bottom of the support plate, a guide wheel A rolling along the outer circumference of the annular track is arranged at the bottom of the upright post, a horizontal support rod is welded in the middle of the upright post, a guide wheel B rolling along the top surface of the annular track is arranged at the end part of the support rod, a guide cylinder is welded at the bottom of the feed hopper, a support extending towards the inner wall of the cyclone well is welded on the outer wall of the guide cylinder, a guide wheel C rolling along the inner wall of the cyclone well is arranged at.
According to the invention, when the soil is dug to the designed height in the step 7), a water accumulation pit is dug on the bottom surface, and a water pump is arranged outside the water accumulation pit to discharge water in the water accumulation pit to the outside of the cyclone well.
When the steel bar mesh is manufactured, an embedded part is arranged at one position, a plurality of U-shaped steel bars are welded at the embedded part from top to bottom to serve as the vertical ladder stands after concrete curing is finished, and each layer of the vertical ladder stands are arranged at the same position of the steel bar mesh.
Compared with the prior art, the invention has the following advantages: 1. the construction efficiency is greatly improved, and the construction period is shortened; 2. has no influence on the surrounding environment.
Drawings
FIG. 1 is a schematic view of the construction of a foundation pit support according to the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a perspective view of the retaining wall form construction of the present invention;
FIG. 4 is a top view of the casting apparatus of the present invention;
FIG. 5 is a view A-A of FIG. 4;
FIG. 6 is a view B-B of FIG. 4;
in the figure: 1-first layer of concrete, 2-circular track, 3-electric single-beam crane, 31-steel upright, 32-supporting beam, 4-pouring device, 41-guide wheel A, 42-upright, 43-supporting rod, 44-supporting plate, 45-guide wheel B, 46-feeding hopper, 47-bracket, 48-guide wheel C, 49-guide cylinder, 410-guide plate, 411-steel wire rope, 412-lifting lug, 5-retaining wall template, 51-arc flat plate, 52-arc rolling plate, 53-reinforcing angle steel, 54-reinforcing rib and 6-cyclone well.
Detailed Description
Referring to fig. 1, 2 and 6, the embodiment is a construction method of a support for a deep foundation pit of a wall guard of a cyclone well with an aperture of 14.1m and a depth of 14.5m, and the design parameters are calculated as follows: the thickness of the protective wall is 0.45m, and the inverted protective wall is divided into 9 layers from-0.6 m to-15.1 m. Each layer from the first layer to the eighth layer is 1.7m high, the last layer is 0.9m high, and the bottom cushion layer of the cyclone shaft is 0.8m high, and the method specifically comprises the following steps:
1) measuring and positioning paying-off, and manufacturing a steel die: manufacturing a steel die according to the diameter of the cyclone well 6, wherein the steel die is formed by splicing 29 sections of the wall protecting templates 5, each section of the wall protecting template 5 comprises two sections of arc-shaped flat plates 51 (the arc length is 1.5 m) with the radius of 7.05m, a section of vertical arc-shaped coiled plate 52 is welded between the two sections of the arc-shaped flat plates 51, and the height of the arc-shaped coiled plate 52 is 1.7 m;
2) breaking underground concrete and other obstacles: breaking the barriers such as concrete on the ground and underground by using an excavator or a hydraulic hammer;
3) inspecting well positions, marking, excavating soil for the first time: the excavator enters the well to dig a first section of soil, and the digging height is 1.7 m;
4) binding reinforcing steel bars, driving in wall-hanging reinforcing steel bars, erecting a formwork: manufacturing and installing a double-layer bidirectional reinforcing mesh along the circumference of the inner wall of the well, and placing a steel mould into the well and positioning the steel mould at the inner side of the reinforcing mesh;
5) pouring a first layer of retaining wall concrete: pouring a circle of concrete into the steel bar net on the periphery of the steel mould to form a first layer of retaining wall structure;
6) installing an electric single-beam crane 3: installing two steel upright columns 31 on the top surface of the first layer of concrete 1 at the top of the cyclone well 6, installing a triangular truss striding over the cyclone well 6 on the top of the two steel upright columns 31, installing an I-shaped steel track beam below the truss, and installing a hoisting mechanism (5 t electric hoist) (not shown in the figure) capable of moving along the I-shaped steel track beam on the I-shaped steel track beam;
7) digging the next section of soil, and binding reinforcing steel bars: a jack is arranged at the bottom of the steel mould to support the steel mould in the process of curing the first layer of concrete 1, then an excavator excavates a layer of soil, the excavation height is 1.7m, the excavated soil pile is hoisted out through an electric single-beam crane 3, and a double-layer bidirectional reinforcing mesh is manufactured after the excavation is finished;
8) after the first layer of concrete 1 is cured, hanging a steel wire rope on a steel mould, hoisting the steel mould by using an electric single-beam crane 3, and slowly putting down the steel mould after a jack is detached;
9) pouring the concrete for the retaining wall: pouring a circle of concrete into the steel bar net on the periphery of the steel mould to form a second-layer retaining wall structure;
10) and (4) circularly repeating the steps 7) to 9) until the earth is excavated to the last layer, hoisting the excavator out through a crane, directly casting and molding the last layer of protective wall and the bottom cushion layer of the cyclone well 6 at one time, dismantling the steel mould after completion and hoisting the steel mould out in sections through the electric single-beam crane 3.
In this embodiment, the reinforcing mesh adopts a double-layer bidirectional structure
14@150 steel bars, phi 8@600 steel bars are adopted between double-layer steel bars, and the steel bars are used for wall protection
The 16@1000 horizontal steel bars are driven into the soil, the length of the steel bars is 0.9m, the steel bars are arranged in a quincunx shape, and the steel bars are poured and tamped between every two layers of protective wallsAnd (3) reserving a drain hole by using a steel pipe phi 48.3, and draining underground water outside the pit wall to a water accumulation pit in the pit.
In this embodiment, a ring of circular track 2 is installed on the top of the first layer of retaining wall concrete inside two columns 31 of the electric single-beam crane 3, a casting device 4 moving along the circular track 2 is installed on the circular track 2, the casting device 4 comprises a feed hopper 46, a support plate 44 striding over the circular track 2 is welded on the feed hopper 46, a column 42 is welded at the bottom of the support plate 44, a guide wheel a41 rolling along the outer circumference of the circular track 2 is installed at the bottom of the column 42, a horizontal support rod 43 is welded in the middle of the column 42, a guide wheel B45 rolling along the top surface of the circular track 2 is installed at the end of the support rod 43, a guide cylinder 49 is welded at the bottom of the feed hopper 46, a support 47 extending towards the inner wall of the cyclone well 6 is welded on the outer wall of the guide cylinder 49, a guide wheel C48 rolling along the inner wall of, a material guide plate 410 is hung on the two lifting lugs 412 through a steel wire rope 411; the material guide cylinder 49 is formed by welding 9 sections, only one section of the material guide cylinder is used for casting the first layer, and one section of the material guide cylinder 49 is welded at the bottom of the material guide cylinder when the next layer is cast; pouring is carried out while pushing the pouring device 4 along the endless track 2 while pouring into the hopper 46, so that the entire circle is poured.
In the embodiment 7), a water collecting pit is dug on the bottom surface every time when the soil is dug to the designed height, and a water suction pump is arranged outside the water collecting pit to discharge water in the water collecting pit to the outside of the cyclone well 6.
In this embodiment, when the reinforcing bar net is manufactured, an embedded part is arranged at one of the positions, after concrete curing is completed, a plurality of U-shaped reinforcing bars are welded at the embedded part from top to bottom to serve as the vertical ladder, and each layer of the vertical ladder is arranged at the same position of the reinforcing bar net.
Claims (3)
1. A construction method for a deep foundation pit support with an inverted hanging retaining wall of a cyclone well is characterized by comprising the following steps: the method comprises the following steps:
measuring and positioning paying-off, and manufacturing a steel die: manufacturing a steel mould according to the diameter of the cyclone well, wherein the steel mould is formed by splicing a plurality of sections of wall protecting templates, each section of wall protecting template comprises two sections of arc-shaped flat plates with the diameter matched with that of the cyclone well, a vertical arc-shaped coil plate is welded between the two sections of arc-shaped flat plates, and the height of the arc-shaped coil plate is determined according to the height of the cyclone well;
breaking underground concrete barriers;
inspecting well positions, marking, excavating soil for the first time: the excavator enters the well to dig a first section of soil, and the digging height is the same as the height of the steel die;
binding reinforcing steel bars, driving in wall-hanging reinforcing steel bars, erecting a formwork: manufacturing and installing a double-layer bidirectional reinforcing mesh along the circumference of the inner wall of the well, and placing a steel mould into the well and positioning the steel mould at the inner side of the reinforcing mesh;
pouring a first layer of retaining wall concrete: pouring a circle of concrete into the steel bar net on the periphery of the steel mould to form a first layer of retaining wall structure;
installing an electric single-beam crane: two steel upright posts are arranged on the reinforced concrete surface at the top of the cyclone well, a triangular truss striding over the cyclone well is arranged at the top of each steel upright post, an I-shaped steel track beam is arranged below the truss, and a hoisting mechanism capable of moving along the I-shaped steel track beam is arranged on the I-shaped steel track beam;
digging the next section of soil, and binding reinforcing steel bars: a jack is arranged at the bottom of the steel mould to support the steel mould in the process of curing the first layer of concrete 1, then an excavator excavates a layer of soil, the excavation height is the same as the height of the steel mould, the excavated soil pile is hoisted out through an electric single beam, and a double-layer bidirectional reinforcing mesh is manufactured after the excavation is finished;
after the first layer of concrete is cured, hanging a steel wire rope on the steel mould, hoisting the steel mould by using an electric single-beam crane, and slowly putting down the steel mould after a jack is detached;
pouring the concrete for the retaining wall: pouring a circle of concrete into the steel bar net on the periphery of the steel mould to form a second-layer retaining wall structure;
circularly repeating the steps 7) to 9) until the excavated soil reaches the designed elevation, hoisting out the excavator through a crane, dismantling the steel mould and hoisting out the steel mould through the electric single-beam crane in sections, and then pouring a bottom cushion layer of the shaft;
the utility model discloses a guide device for a wall guard of an electric single beam crane, including first layer dado concrete top, the first layer dado is located two stand inboards of electronic single beam crane and is equipped with round looped rail, the last pouring device that removes along looped rail that is equipped with of looped rail, the pouring device includes the feeder hopper, the welding has a backup pad that strides across the looped rail top on the feeder hopper, the welding of backup pad bottom has a stand, the stand bottom is equipped with along the rolling leading wheel A of looped rail outer circumference, the welding has a horizontally bracing piece in the middle of the stand, bracing piece tip is equipped with along the rolling leading wheel B of looped rail top surface, the welding has a guide cylinder bottom, the support of welding directional whirl well inner wall extension on the guide cylinder outer wall, the support tip is equipped with along the rolling leading wheel C of whirl.
2. The construction method for the inverted retaining wall deep foundation pit support of the cyclone well as claimed in claim 1, wherein the construction method comprises the following steps: and 7) digging a water accumulation pit on the bottom surface when the soil is dug to the designed height, and placing a water suction pump outside the water accumulation pit to discharge water in the water accumulation pit to the outside of the cyclone well.
3. The construction method for the inverted retaining wall deep foundation pit support of the cyclone well as claimed in claim 1, wherein the construction method comprises the following steps: when the reinforcing mesh is manufactured, an embedded part is arranged at one position, and a plurality of U-shaped reinforcing steel bars are welded at the position of the embedded part from top to bottom after concrete curing is completed to serve as the vertical ladder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811420916.7A CN109403354B (en) | 2018-11-27 | 2018-11-27 | Construction method for deep foundation pit support of inverted retaining wall of cyclone well |
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| CN201811420916.7A CN109403354B (en) | 2018-11-27 | 2018-11-27 | Construction method for deep foundation pit support of inverted retaining wall of cyclone well |
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| CN110552540A (en) * | 2019-08-08 | 2019-12-10 | 上海二十冶建设有限公司 | construction method of inverted retaining wall supporting structure of cyclone tank adjacent to existing building |
| CN110453689A (en) * | 2019-09-03 | 2019-11-15 | 中国建筑一局(集团)有限公司 | Circular foundation pit lining wall formwork construction system and construction method |
| CN110836030A (en) * | 2019-11-22 | 2020-02-25 | 上海宝冶集团有限公司 | Clockwise and anticlockwise combined cyclone well construction method suitable for complex geological conditions |
| CN112482538A (en) * | 2020-12-01 | 2021-03-12 | 姜振波 | Pouring process applying steel supporting structure |
| CN113289770B (en) * | 2021-04-30 | 2022-06-28 | 江西省全鑫科技有限公司 | Desk type high-speed refrigerated centrifuge based on alternating current variable frequency motor drive and method thereof |
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| CN201531271U (en) * | 2009-08-28 | 2010-07-21 | 中冶集团华冶资源开发有限责任公司 | Square well supporting steel template structure |
| CN102767187A (en) * | 2012-08-03 | 2012-11-07 | 天津二十冶建设有限公司 | Reverse construction method for pebble foundation swirling well |
| CN102913248B (en) * | 2012-11-13 | 2015-12-02 | 广汉金达隧道机械有限公司 | The overall upset hanging template of wholecircle and formwork erection, release method |
| JP5569705B1 (en) * | 2013-12-16 | 2014-08-13 | 株式会社上村組 | Drilling hole fall prevention device |
| CN103850686A (en) * | 2014-03-21 | 2014-06-11 | 中煤矿山建设集团有限责任公司 | Vertical shaft sleeve wall integral hydraulic template |
| CN207747211U (en) * | 2018-01-15 | 2018-08-21 | 江苏江扬建材机械有限公司 | The material distributing machine of concrete automatic blanking |
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