CN212688964U - Deep and large foundation pit sinking construction system for complex urban environment - Google Patents
Deep and large foundation pit sinking construction system for complex urban environment Download PDFInfo
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- CN212688964U CN212688964U CN202020993400.8U CN202020993400U CN212688964U CN 212688964 U CN212688964 U CN 212688964U CN 202020993400 U CN202020993400 U CN 202020993400U CN 212688964 U CN212688964 U CN 212688964U
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- 238000010276 construction Methods 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
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- 239000004567 concrete Substances 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 20
- 239000002689 soil Substances 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 11
- 238000005520 cutting process Methods 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 4
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 11
- 230000002093 peripheral effect Effects 0.000 abstract description 8
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- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
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- 230000008901 benefit Effects 0.000 description 2
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- 238000005259 measurement Methods 0.000 description 2
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- 239000002023 wood Substances 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 108010000126 Gabolysat PC60 Proteins 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
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- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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Abstract
The utility model provides a deep big foundation ditch sinking construction system of complicated urban environment, including laying the subsidence detection device at the earth's surface, locate the open caisson wall of a well, lay the peripheral stagnant water curtain in the open caisson wall of a well, the concrete back cover, be located the long arm of earth's surface and dig the machine with being located the little machine of digging in the open caisson, subside detection device is including laying the positive east of open caisson, just west, just south, four direction round steel of positive north and the spirit level of laying on the earth's surface around the open caisson, every direction is equipped with respectively apart from the open caisson wall of a well 2m, 5m, three round steel that 8m laid, the open caisson wall of a well is the formula of sinking well wall of a well, constitute by 5 or 6 sections walls of a well, lower floor wall of a well lower part. The utility model discloses lay the monitoring round steel outside the open caisson, be favorable to detecting the deflection to the peripheral earth's surface of open caisson through the spirit level and monitor to according to the deformation trend that peripheral earth's surface subsides, judge this construction method's reliability and practicality, have characteristics such as safe, suitable, have fine popularization and practical value.
Description
Technical Field
The utility model relates to a construction field specifically belongs to a deep and big foundation ditch of complicated urban environment construction system that sinks.
Background
The open caisson is a shaft-shaped structure, soil and stones in the open caisson are usually removed by mechanical excavation, the open caisson gradually sinks to a designed elevation after overcoming the frictional resistance of the well wall mainly by self gravity, but the conventional open caisson sinking construction method can cause difficult sinking and over-digging of the open caisson when applied to urban environments with dense population and sand layer geology with strong water permeability, the influence on the surrounding environment is difficult to control, the pavement is damaged by cracking, collapse and the like, and the construction period is not controllable.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a deep big foundation ditch of complicated urban environment construction system that sinks, the technical problem that the prior art open caisson excavation degree of difficulty is big is solved.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a deep big foundation ditch of complicated urban environment system of sinking which characterized in that: including laying at the subsidence detection device on earth's surface, locating the open caisson wall in the open caisson, laying at the peripheral stagnant water curtain of open caisson wall, concrete back cover, the long arm that is located the earth's surface digs the machine and is located the little machine of digging in the open caisson, subside detection device including laying at the open caisson four direction round steel of open caisson just east, just west, just south, just north and laying at the spirit level on the earth's surface around the open caisson, every direction is equipped with respectively apart from three round steel that the open caisson wall of a well 2m, 5m, 8m laid, the open caisson wall of a well is the self-sinking open caisson wall of a well, comprises 5 or 6 sections walls of a well, and lower floor's wall of a well lower part is the open caisson sword.
Further preferably, the waterproof curtain is a triaxial mixing pile waterproof curtain poured by a two-spraying and two-mixing method, the horizontal distance from the wall of the open caisson is 0.9m, and the pile length is 29.4 m.
Further, the open caisson is provided with a C20 concrete cushion layer with the thickness of 0.15m along the edge.
Furthermore, the open caisson cutting edge comprises a rectangular upper part and a right trapezoid lower part, a right trapezoid groove is arranged on the inner side of the well wall of the rectangular upper part, and the right angle part of the right trapezoid groove is close to the rectangular upper part.
Furthermore, each round steel is phi 18 round steel, the distance between each round steel and each round steel is 5cm, the round steel is exposed out of the ground surface, and the round steel enters an undisturbed soil layer by 0.5-1 m.
In addition, the height of the edge foot of the open caisson is the same as the thickness of the concrete bottom sealing.
More preferably, the wall of the open caisson is a reinforced concrete round open caisson, the outer diameter is 10.2m, the height is 17.47m, the wall thickness is 0.85m, each section is 3.6m, the sinking depth is 20.57m, the height of the edge foot of the open caisson is 2.3m, and the tread width is 0.25 m.
Compared with the prior art the utility model has the following characteristics and beneficial effect:
1) the utility model can meet the requirements of the ground and pipeline settlement control around the open caisson, and the three rows of triaxial mixing pile water-stop curtains around the open caisson ensure that the excavation machinery combination is implemented and the deformation of the surrounding stratum is controlled under the protection of the water-stop curtain with high strength and good water-stop effect;
2) the combined excavation method of the long-arm excavator out-of-well excavation and the small excavator in-well excavation can realize efficient and rapid sinking, the small excavator in-well excavation is more visual to expose the obstacles which can be met in the sinking process, measures are taken immediately, the open caisson excavation sinking is not limited by the surrounding environment, and the construction period can be ensured;
3) the utility model discloses lay the monitoring round steel outside the open caisson, be favorable to detecting the deflection to the peripheral earth's surface of open caisson through the spirit level and monitor to according to the deformation trend that peripheral earth's surface subsides, judge this construction method's reliability and practicality, have characteristics such as safe, suitable, have fine popularization and practical value, can produce good economic benefits after extensive popularization and application.
Drawings
Fig. 1 is a schematic view of a layout structure of a settlement detecting device according to the present invention;
fig. 2 is a schematic working diagram of the long arm excavator according to the present invention;
fig. 3 is a schematic working diagram of a small excavator according to the present invention;
fig. 4 is a diagram for the completion of the sinking well wall settlement of the utility model.
Reference numerals: 1-open caisson; 2-waterproof curtain; 3-sinking well wall; 4-concrete bottom sealing; 5-round steel; 6-a level gauge; 7-rectangular upper part; 8-lower part of right trapezoid; 9-right trapezoid grooves; 10-a long arm excavator; 11-small excavator.
Detailed Description
In order to make the technical means, innovative features, objectives and functions realized by the present invention easy to understand, the present invention will be further described below.
The embodiments described herein are specific embodiments of the present invention, and are intended to be illustrative of the concepts of the present invention, which are intended to be illustrative and exemplary, and should not be construed as limiting the scope of the embodiments of the present invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
The utility model provides a deep big foundation ditch sinking construction system of complicated urban environment, as shown in fig. 1~4, including the subsidence detection device of laying at the earth's surface, locate the open caisson wall of a well 3 in the open caisson 1, lay at the peripheral stagnant water curtain 2 of open caisson wall of a well 3, concrete back cover 4, be located the long arm excavator 10 of earth's surface and be located the little excavator 11 of open caisson 1, subsidence detection device is including laying at open caisson 1 just east, just west, just south, four direction round steel 5 of just north and laying the spirit level 6 on the earth's surface around open caisson 1, every direction is equipped with three round steel 5 that lay apart from open caisson wall of a well 32m, 5m, 8m respectively, round steel 5 adopts phi 18 round steel, all the distance is 5cm from the earth's surface, get into original state soil horizon 0.5~1m, open caisson wall of a well 3 is the formula of sinking open caisson wall of a well, constitute by 5 or 6 sections of a well walls, lower floor's wall lower.
The water-stop curtain 2 is a three-shaft stirring pile water-stop curtain poured by a two-spraying two-stirring method, the horizontal distance from the well wall 3 of the open caisson is 0.9m, the pile length is 29.4m, a C20 concrete cushion (not shown in the figure) with the thickness of 0.15m is arranged along the well edge of the open caisson 1, the well edge foot of the open caisson comprises a rectangular upper part 7 and a right-angled trapezoid lower part 8, a right-angled trapezoid groove 9 is arranged on the inner side of the well wall of the rectangular upper part 7, the right-angled part of the right-angled trapezoid groove 9 is close to the rectangular upper part 7, the height of the well edge foot is the same as the thickness of a concrete bottom sealing 4, the well wall 3 of the open caisson is a reinforced concrete round well open caisson, the outer diameter is 10.2m, the height is 17.47m, the wall thickness is 0.85m, the height of each section is 3.
The utility model discloses a deep big open caisson sinking construction method of complicated urban environment, including following step:
(1) the method comprises the steps of arranging a group of monitoring sections on a ground surface plane away from the open caisson, arranging ground surface settlement monitoring points according to the distance of 2m, 5m and 8m in each group, setting more than 2 reference points by adopting phi 18 round steel for the settlement monitoring points, enabling the upper ends of reinforcing steel bars to be 5cm away from the ground and to enter an undisturbed soil layer for 1m, and monitoring the trend of the deformation of the ground surface outside the open caisson foundation pit by monitoring the initial values and the process measurement values of the monitoring points around the open caisson.
The reference points are distributed at positions far away from the two ends of the deformation area. The settlement measurement adopts a Tianbao DINI03 precision level gauge and a matched bar code indium steel ruler; the measuring method comprises the following steps: the settlement monitoring point observation is carried out by taking an adjacent working base point (adjustment) as a starting point, adopting a geometric leveling method and combining an attached leveling method and a mesoscopic leveling method, wherein the settlement monitoring point is generally taken as a mesoscopic point. And (3) looking back at the working datum point, then looking forward at the station, adopting an aBFFB measuring method, after the station is finished, adopting a mesoscopic method to measure all settlement monitoring points of the station, then carrying out the next station, and repeating the above processes until the station is attached to another working datum point. The initial value of the elevation of each monitoring point is measured for three times before construction (averaging for three times), the difference value of the current elevation minus the previous elevation of a certain monitoring point is the current vertical displacement, and the difference value of the current elevation minus the initial elevation is the accumulated vertical displacement.
(2) Triaxial stirring stake stagnant water curtain: and (3) driving three rows of vertical waterproof curtains of the three-axis mixing piles at a distance of 0.9m from the periphery of the open caisson structure, releasing a pile position control line according to construction drawings, and strictly controlling the position of a drill bit according to the control line after the machine is in place, wherein the piles are arranged firstly and then are arranged outside. The cement-soil mixing pile body adopts 42.5-grade ordinary portland cement, the cement mixing amount is 20%, the water cement ratio is 0.6, and the lap joint between two piles is 250 mm. The two-spraying and two-stirring process is adopted, a jumping groove is sleeved with a hole for construction, a drill bit adopts a spiral blade type, the main shaft rotates forwards to spray slurry and stir to sink, and the reverse-rotation spray slurry is stirred and lifted again, so that the construction of a group of three-shaft stirring piles is completed.
(3) Construction parameters of the triaxial mixing pile: the stirring sinking speed is 1m/min, the drill rod lifting speed is 1m/min, the stirring rotating speed is 40r/min, the grouting pressure is 1MPa, the cement paste stirring time is not less than 3min, and the cement dosage per cubic soil body is 360kg/m3。
Construction of triaxial mixing pileAnd (3) detecting the pile body after completion: and the strength, the impermeability and the integrity of the body are enhanced. And in the sand layer, whether the continuity of the three-axis stirring pile reinforcement body is good or not is judged. The core-pulling position is selected at the occlusion position between the piles, and 28d unconfined compressive strength is more than or equal to 0.8; the permeability coefficient of the cement soil reinforcing body is not more than 10-7cm/s。
(4) And (3) open caisson structure construction: and (3) excavating foundation pits from the ground surface slope, and pouring C20 concrete cushion layers with the width of 2m and the thickness of 0.15m above the stable pressure-bearing water level. And (3) finishing the first section of well wall and the second section of well wall in the first construction, excavating to sink to a residual 500mm structure, heightening the third section of well wall in the sinking well, excavating to the residual 500mm structure of the third section of well wall in sequence, heightening the fourth section of well wall and the fifth section of well wall, and sinking to a designed bottom elevation.
Positioning the circle center position of the open caisson before manufacturing the open caisson edge leg and the well wall, and placing a side line point every 200mm around the circumferential position to ensure the position and the shape of the circular open caisson;
the connecting position of the inner side of the blade foot and the post-cast bottom plate is provided with a groove with the depth of 200mm and the height of 1050mm, a formwork supporting method is carried out by the same well wall method, a wood formwork, square wood and split bolts are adopted for supporting, and formwork supporting parameters are as follows: the method is characterized in that a 15-thick multilayer board, a secondary ridge of 50 multiplied by 100 square timber @0.2M, two phi 20 steel bars of a main ridge of @0.6 and M16 split bolts of @0.6 multiplied by 0.6M are adopted, and a non-standard section of an inner mold is supported by a horizontal steel pipe to be abutted.
After the concrete strength of the blade foot of the open caisson reaches 100% of the design strength, subsequent construction can be carried out, a horizontal construction joint of the well wall is formed, a convex groove with the width and the height of 100mm is chiseled in the center of the well wall, the well wall is chiseled, and concrete is poured on the side wall of the open caisson.
(5) Sinking and excavating construction of the open caisson: adopting two excavation machines to carry out matched construction, adopting a long-arm excavator to dig soil in the well from the ground when the early excavation depth is more than 15m, and cutting soil at the edge foot of the open caisson and sinking; when the open caisson excavation depth is below 15m, well open drainage is adopted, a small excavator is built in a well and used for digging the soil body of the bottom of the cutting edge and the clearance outside the cutting edge, the crane lifts the soil hopper to the ground for discharging, and the soil hopper is excavated to the designed bottom elevation.
Sinking the open caisson for more than 15 m: the long-arm excavator extends from the middle excavation of the open caisson to the peripheral cutting edge, the excavation depth is 0.5m each time, and the excavation is carried out in sequence, so that the cutting edge of the open caisson sinks after cutting soil.
Sinking the open caisson by 15m at the following sections: under the protection of a waterproof curtain dug in a small excavator well, the amount of water which is disturbed into the bottom of a foundation pit by confined water is 1089m3And d, a 22KW slurry pump is arranged in the well for pumping water, a PC60 digs a middle soil dike of the machine station, soil bodies of bottoms of the digging edges and the outside empty space of the well wall are dug along the periphery of the open caisson, and the broken head is replaced to remove the obstacles during the sinking process of the open caisson so as to enable the open caisson to sink.
(6) Sealing the bottom of the open caisson by using underwater concrete: when the sinking distance of the open caisson is 100mm from the designed elevation, stopping digging soil in the open caisson, sinking to the designed elevation or approaching the designed elevation by self weight, observing the elevation difference once every 1 hour, and sealing the bottom of the open caisson when the sinking rate of the open caisson is not more than 10mm/8 h; before sealing the bottom underwater, a diver lays a layer of gravel cushion layer with the thickness of 150mm under the blade foot and cleans the soil around the blade foot; pouring the underwater back cover by a guide pipe method, pouring concrete on the periphery of the well wall and pushing the concrete to the middle; and pouring the underwater back cover with the thickness of 1.6m at every 3m point position around the edge of the open caisson, and pumping water in the open caisson after the underwater back cover concrete is cured to 70% of the designed strength.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above, it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a deep big foundation ditch of complicated urban environment system of sinking which characterized in that: the sinking detection device comprises a sinking detection device arranged on the ground surface, a sinking well wall (3) arranged in a sinking well (1), a waterproof curtain (2) arranged on the periphery of the sinking well wall (3), a concrete back cover (4), a long-arm excavator (10) arranged on the ground surface and a small excavator (11) arranged in the sinking well (1), wherein the sinking detection device comprises round steel (5) arranged on the four directions of the sinking well (1), namely the east, the west, the south and the north and a level gauge (6) arranged on the ground surface around the sinking well (1), three round steel (5) arranged at intervals of 2m, 5m and 8m from the sinking well wall (3) in each direction are arranged, the sinking well wall (3) is a self-sinking type sinking well wall and consists of 5 or 6 well walls, and the lower part of the lowest well wall is a sinking well edge foot.
2. The complex urban environment deep and large foundation pit sinking construction system according to claim 1, characterized in that: the waterproof curtain (2) is a triaxial mixing pile waterproof curtain poured by a two-spraying and two-stirring method, the horizontal distance from the open caisson wall (3) is 0.9m, and the pile length is 29.4 m.
3. The complex urban environment deep and large foundation pit sinking construction system according to claim 1, characterized in that: and a C20 concrete cushion layer with the thickness of 0.15m is arranged at the edge of the open caisson (1).
4. The complex urban environment deep and large foundation pit sinking construction system according to claim 1, characterized in that: the open caisson cutting edge comprises a rectangular upper portion (7) and a right trapezoid lower portion (8), a right trapezoid groove (9) is formed in the inner side of a well wall of the rectangular upper portion (7), and the right angle portion of the right trapezoid groove (9) is close to the rectangular upper portion (7).
5. The complex urban environment deep and large foundation pit sinking construction system according to claim 1, characterized in that: each round steel (5) is phi 18 round steel, the distance is 5cm from the ground surface, and the round steel enters an undisturbed soil layer by 0.5-1 m.
6. The complex urban environment deep and large foundation pit sinking construction system according to claim 1, characterized in that: the height of the edge foot of the open caisson is the same as the thickness of the concrete back cover (4).
7. The complex urban environment deep and large foundation pit sinking construction system according to any one of claims 1-6, characterized in that: the open caisson wall (3) is a reinforced concrete round open caisson, the outer diameter is 10.2m, the height is 17.47m, the wall thickness is 0.85m, each section is 3.6m, the sinking depth is 20.57m, the height of an open caisson cutting edge is 2.3m, and the tread width is 0.25 m.
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| CN202020993400.8U CN212688964U (en) | 2020-06-03 | 2020-06-03 | Deep and large foundation pit sinking construction system for complex urban environment |
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| CN202020993400.8U CN212688964U (en) | 2020-06-03 | 2020-06-03 | Deep and large foundation pit sinking construction system for complex urban environment |
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