CN111139855A - Bottom concrete caisson capable of self-weight forced landing and construction method - Google Patents
Bottom concrete caisson capable of self-weight forced landing and construction method Download PDFInfo
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- CN111139855A CN111139855A CN201911357938.8A CN201911357938A CN111139855A CN 111139855 A CN111139855 A CN 111139855A CN 201911357938 A CN201911357938 A CN 201911357938A CN 111139855 A CN111139855 A CN 111139855A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/08—Lowering or sinking caissons
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Abstract
The invention discloses a bottom concrete caisson capable of self-weighted forced landing and a construction method thereof, wherein the bottom concrete caisson comprises a bottom concrete caisson at the lower part, a plurality of upper part continuous concrete caissons and at least one reverse circulation slurry pumping drilling machine component, the edge of the bottom concrete caisson at the lower part is provided with a circle of steel plate blade, the reverse circulation slurry pumping drilling machine component comprises a hollow drill rod, a main water inlet pipe and a plurality of first high-pressure water spraying pipes, the side walls of the bottom concrete caisson at the lower part and the upper part continuous concrete caisson are internally provided with a plurality of second high-pressure water spraying pipes, during operation, sediment at the bottom of the caisson is alternately punched by the water inlet of the main water inlet pipe and the high-pressure water spraying systems, the hollow drill rod rotates and works together with a slurry pumping pump to continuously pump a sediment-water mixed soil layer at the bottom of the caisson and is poured into the upper part caisson to. The technology makes the concrete caisson be constructed under the geological condition of high underground water level, does not need precipitation, and has the advantages of safe and reliable construction method, cost reduction and environmental pollution reduction.
Description
Technical Field
The embodiment of the invention relates to the field of building equipment, in particular to a bottom concrete caisson capable of realizing self-weight forced landing and a construction method.
Background
With the technological progress and the increasing living standard of people, motor vehicles such as automobiles and electric vehicles have entered into thousands of households, and driving and traveling have become indispensable working and living habits of people. Although the number of motor vehicles in China is rapidly increased in recent years, the average increase speed of urban roads is only 2% -3%, particularly, the increase of the number of motor vehicles in large cities far exceeds the increase speed of traffic infrastructure, and the phenomenon that parking spaces in various cities are seriously insufficient is directly caused. Under the current situation that the space is limited and the parking spaces are lacked, people begin to build underground garages on a large scale.
Although underground garage has effectively solved the nervous problem of parking stall, there is following problem in the current underground garage construction process:
1. a part of existing underground garages are in the construction form of excavation foundation pit side wall support, the construction mode is large in capital investment, low in return rate, long in engineering construction period and large in surrounding environment influence.
2. The other part of the existing underground garage is constructed by a construction caisson process, the construction caisson process is mostly in an air-closed type, precipitation construction and manual or mechanical excavation are carried out, the caisson often sinks and cannot sink when meeting obstacles in the construction process of the construction caisson, the caisson is easy to incline, the construction mode is poor in safety and low in efficiency, and precipitation can seriously affect the surrounding environment and underground water.
Disclosure of Invention
Therefore, the embodiment of the invention provides a bottom concrete caisson capable of realizing self-weight forced lowering and a construction method, and aims to solve the problems of high capital investment, long construction period, poor safety and environmental pollution of the existing garage construction process.
In order to achieve the above object, an embodiment of the present invention provides a bottom-type concrete caisson capable of self-weight forced landing, including a bottom-type concrete caisson at a lower portion and a plurality of upper-portion continuous concrete caissons, wherein the bottom-type concrete caisson at the lower portion has an opening at a top thereof, a bottom plate of the bottom-type concrete caisson is disposed at a bottom of the bottom-type concrete caisson at the lower portion, and the plurality of upper-portion continuous concrete caissons are sequentially stacked on the top of the bottom-type concrete caisson at the lower portion; the self-weighted forced-landing bottomed concrete caisson further comprises at least one reverse circulation slurry pumping drilling rig assembly, the concrete caisson bottom plate is provided with at least one through hole, the edge of the bottom of the concrete caisson with a bottom at the lower part is provided with a circle of steel plate edge feet, the reverse circulation slurry pumping drilling machine component comprises a hollow drill rod, a main water inlet pipe and a plurality of first high-pressure water spraying pipes, the upper end of the main water inlet pipe extends upwards, the lower end of the main water inlet pipe correspondingly penetrates through the through holes one by one and then extends downwards, the hollow drill rod can be rotatably inserted into the middle part of the main water inlet pipe, the lower end of the hollow drill rod is provided with a drill bit, an annular space is formed between the hollow drill rod and the inner wall of the main water inlet pipe, a plurality of first high-pressure water spray pipes are arranged on the outer peripheral surface of the main water inlet pipe at intervals, the lower end of the first high-pressure water spray pipe extends along the radial direction of the main water inlet pipe, and the upper end of the first high-pressure water spray pipe extends upwards; and a plurality of second high-pressure water spraying pipes are vertically arranged in the side walls of the lower bottom-containing concrete caisson and the upper continuous concrete caisson at intervals.
Furthermore, the lower bottom-containing concrete caisson and the upper connecting concrete caisson are both rectangular box bodies, the height of the lower bottom-containing concrete caisson is 2-3m, and the height of the upper connecting concrete caisson is 3-4 m.
Further, the steel plate edge foot is welded or connected with the concrete caisson with the bottom at the lower part through bolts.
Correspondingly, the invention also provides a construction method of the self-weighted forced-landing bottom concrete caisson, which comprises the following steps:
step a, a circulating slurry pumping pump drilling machine drives a hollow drill rod to rotate, a drill bit cuts sandy soil on the lower part of a concrete caisson with a bottom at the lower part, a main water inlet pipe and a first high-pressure water spraying pipe spray high-pressure water to the lower part of the concrete caisson with a bottom at the lower part to wash the sandy soil, and meanwhile, the hollow drill rod is used for pumping slurry to form reverse circulation;
b, conveying the mud and the silt clamped in the mud to a concrete caisson with a bottom at the lower part by using a hollow drill rod, and after the silt is precipitated, feeding separated water into a main water inlet pipe and a first high-pressure water spray pipe for recycling;
c, stacking an upper continuous concrete caisson on the top of the lower bottom concrete caisson after the lower bottom concrete caisson is descended to a preset height;
d, repeating the step a, the step b and the step c in sequence until the bottom type concrete caisson descends to the designed depth;
and e, plugging the through hole by using high-pressure cement paste.
Further, before performing step a, also performing step a 1: and pouring a bottom caisson and a bottomless caisson on the ground surface, and installing a hollow drill rod, a main spray pipe and a first high-pressure spray pipe.
Further, before performing step a1, also performing step a 0: and digging the surface sandy soil layer to a position 0.5m above the initial water level depth.
Further, step e is executed while step f is executed: and injecting cement slurry into the outer sides of the bottom caisson and the bottomless caisson to ensure that the side walls of the bottom caisson and the bottomless caisson are fixedly connected with the stratum.
The embodiment of the invention has the following advantages:
1. the bottom-type concrete caisson capable of realizing self-weighted forced landing adopts a high-pressure circulating water scouring self-weighted forced landing technology, so that the concrete caisson can be constructed under the geological condition of high underground water level, the precipitation operation is not needed, the construction method is safe, reliable, quick and simple, the cost is greatly reduced, the occupied area is small, and the environment pollution is reduced.
2. The self-weight forced-landing bottom concrete caisson can enable the small three-dimensional parking market to be industrialized, and during practical application and popularization, a plurality of caissons can be continuously arranged to meet the quantity requirement of practical requirements. The parking system can be built on two sides of a road, parking is convenient, the problem of road occupation parking is thoroughly solved, and the parking system has great popularization value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a schematic side sectional view of a self-ballasted bottomed concrete caisson according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;
fig. 3 is a flow chart of a construction method of a self-weighted forced-landing bottom concrete caisson provided by the embodiment of the invention.
Description of reference numerals: 1. a bottom caisson; 2. a bottomless caisson; 3. a base plate; 4. enclosing plates; 5. a hollow drill rod; 6. a main spray pipe; 7. a first high pressure spray pipe; 8. a drill bit; 10. a second high pressure spray pipe; 11. a high pressure water pump; 12. and (5) a slurry pump drilling machine.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, the self-weighted forced-landing bottom concrete caisson comprises a bottom concrete caisson 1 at the lower part, a plurality of upper continuous concrete caissons 2 and at least one reverse circulation slurry pumping drilling machine assembly, wherein the bottom concrete caisson 1 at the lower part and the upper continuous concrete caisson 2 are both made of reinforced concrete structures poured by cement, the bottom concrete caisson 1 at the lower part and the upper continuous concrete caisson 2 at the upper part are both cuboid boxes, preferably square boxes, the height of the bottom concrete caisson 1 at the lower part is 2-3m, and the height of the concrete caisson 2 at the upper part is 3-4 m.
The bottom of the concrete caisson 1 with a bottom is provided with an opening, the bottom of the concrete caisson 1 with a bottom is provided with a concrete caisson bottom plate 3, the concrete caisson bottom plate 3 is provided with at least one through hole, the edge of the bottom of the concrete caisson 1 with a bottom is provided with a circle of steel plate edge feet 4, the steel plate edge feet 4 are made of metal, the steel plate edge feet 4 are welded or bolted with the concrete caisson 1 with a bottom, when the bottom of the concrete caisson 1 with a bottom descends, the steel plate edge feet 4 can control the water flow sprayed by the main water inlet pipe 6 and the first high-pressure water spraying pipe 7 to the inner sides of the steel plate edge feet 4, so that the sand and soil on the inner sides of the steel plate edge feet 4 can be effectively washed, the sinking speed of the concrete caisson 1 with a bottom is accelerated, and the operation efficiency is.
The top and the bottom of the upper continuous concrete caisson 2 are both provided with openings, a plurality of upper continuous concrete caissons 2 are sequentially overlapped on the top of the lower bottom-containing concrete caisson 1, the lower bottom-containing concrete caisson 1 sinks, the upper continuous concrete caisson 2 sinks along with the lower bottom-containing concrete caisson 1, the lower bottom-containing concrete caisson 1 and the inner side wall of the upper continuous concrete caisson 2 are vertically provided with a plurality of second high-pressure water spraying pipes 10 at intervals, and the upper ends of the second high-pressure water spraying pipes 10 are connected with the high-pressure water pump 11.
When the upper continuous concrete caisson 2 at the uppermost part sinks to a predetermined depth, the next upper continuous concrete caisson 2 is superposed on the upper part of the upper continuous concrete caisson 2, and the second high-pressure water spraying pipes 10 in the side walls of each caisson are sequentially connected end to end. The second high-pressure water spraying pipe 10 is used for washing sandy soil on the lower edge of the upper continuous concrete caisson 2, and the sandy soil at each angle below the lower bottom-containing concrete caisson 1 can be washed by spraying water flow together with the main water inlet pipe 6 and the first high-pressure water spraying pipe 7 through the second high-pressure water spraying pipe 10, so that the upper continuous concrete caisson 2 is ensured to descend in a balanced manner, inclination is prevented, and construction safety is improved; in the process of sinking the concrete caisson with the bottom, because the concrete caisson 1 with the bottom at the lower part and the continuous concrete caisson 2 at the upper part are used for supporting, the soil body on the side surface can not have collapse accidents, and the safety in construction is effectively improved.
As shown in fig. 2, the reverse circulation slurry pumping drilling machine assembly comprises a hollow drill rod 5, a main water inlet pipe 6 and a plurality of first high-pressure water spraying pipes 7, wherein the upper end of the main water inlet pipe 6 extends upwards, the lower end of the main water inlet pipe 6 penetrates through the through holes one to one and then extends downwards, when the liquid level of slurry in the caisson is higher than the upper port of the main water inlet pipe 6, the slurry can flow downwards along the main water inlet pipe 6, and the slurry can scour sandy soil below the bottom concrete caisson 1 under the action of gravity. The hollow drill rod 5 is rotatably inserted into the main water inlet pipe 6, a drill bit 8 is arranged at the lower end of the hollow drill rod 5, the height of the drill bit 8 is lower than that of the lower port of the main water inlet pipe 6, and the drill bit 8 is used for cutting sand and soil below the concrete caisson 1 with the bottom at the lower part.
The upper end of the hollow drill rod 5 extends upwards to form an upper port of the main water inlet pipe 6 and then is connected with the circulating slurry pumping pump drilling machine 12, the circulating slurry pumping pump drilling machine 12 is used for driving the hollow drill rod 5 to rotate, so that sandy soil is cut, meanwhile, the circulating slurry pumping pump drilling machine 12 can also pump slurry below the concrete caisson 1 with the bottom at the lower part through the hollow drill rod 5 and take away part of silt to be sent into the caisson, the dead weight of the caisson is increased, the sinking speed of the concrete caisson 1 with the bottom at the lower part is accelerated, and the operation efficiency is further improved.
An annular space is arranged between the hollow drill rod 5 and the inner wall of the main water inlet pipe 6, the annular space is used as a channel for downward flowing of water separated by mud in the caisson, a plurality of first high-pressure water spray pipes 7 are arranged on the outer circumferential surface of the main water inlet pipe 6 at intervals, the number of the first high-pressure water spray pipes 7 is four in the embodiment, the number of the first high-pressure water spray pipes 7 is not limited to the above, more first high-pressure water spray pipes 7 can be arranged according to the requirement, the lower ends of the first high-pressure water spray pipes 7 extend along the radial direction of the main water inlet pipe 6, the upper ends of the first high-pressure water spray pipes 7 extend upwards and are connected with the high-pressure water pump 11, as the washing area of the main water inlet pipe 6 is limited, sand and sand at some positions below the concrete caisson 1 with a bottom at the lower part can not be washed, the washing area is greatly increased by arranging the first high-pressure water, the first high-pressure water spray pipe 7 or the second high-pressure water spray pipe 10 sprays the water to the periphery, so that the scouring area is greatly increased, and the operation efficiency is improved. Because the length of the hollow drill rod 5, the main water inlet pipe 6 and the first high-pressure water spraying pipe 7 also needs the height matching of the caisson along with the increase of the number of the upper continuous concrete caissons 2, the hollow drill rod 5, the main water inlet pipe 6 and the first high-pressure water spraying pipe 7 can adopt a whole pipe with longer length or adopt a mode of sequentially connecting the pipes end to end. When the self-weighted forced landing device works, the main water inlet pipe 6 and the high-pressure water spraying system alternately scour the bottom silt soil body, the hollow drill rod 5 rotates and works together with the slurry pumping pump, so that the reverse circulation drilling machine system continuously pumps the silt and water mixed soil layer below the concrete caisson and injects the silt and water mixed soil layer into the upper well to generate gravity, silt and soil are naturally precipitated and separated in the well, silt is precipitated, water is recycled, and the high-pressure water scouring circulation slurry pumping self-weighted forced landing technology is formed. The self-weight forced-landing bottom concrete caisson can be used for industrialization of small three-dimensional parking markets, and when the caisson is popularized in practical application, a plurality of caissons can be continuously arranged to meet the quantity requirement of practical requirements. The parking system can be built on two sides of a road, parking is convenient, the problem of road occupation parking is thoroughly solved, and the parking system has great popularization value.
As shown in fig. 3, the construction method of the self-weighted forced-landing bottom concrete caisson comprises the following steps:
step a, a circulating slurry pumping pump drilling machine 12 drives a hollow drill rod 5 to rotate, a drill bit 8 cuts sandy soil on the lower part of a bottom concrete caisson at the lower part, a main water inlet pipe 6 and a first high-pressure water spraying pipe 7 spray high-pressure water to the lower part of the bottom concrete caisson 1 at the lower part to wash the sandy soil, and meanwhile, the hollow drill rod 5 is used for pumping slurry to form reverse circulation;
the high-pressure water pump 11 respectively conveys the pumped water to the lower part of the concrete caisson 1 with the bottom at the lower part through the first high-pressure water spray pipe 7 and the second high-pressure water spray pipe 10, the sand and the soil below the concrete caisson 1 with the bottom at the lower part are washed by high-pressure water flow,
the water pumped by the high-pressure water pump 11 is mainly derived from the slurry segregation water in the caisson, and if the water in the caisson is insufficient at the beginning, external water supply can be performed, and the water is pumped from the caisson after normal cycle construction operation.
Further, before performing step a, also performing step a 1: and pouring a concrete caisson 1 with a bottom at the lower part and a continuous concrete caisson 2 at the upper part on the ground surface, and installing a hollow drill rod 5, a main water inlet pipe 6 and a first high-pressure water spraying pipe 7.
Further, before performing step a1, also performing step a 0: and digging the surface sandy soil layer to a position 0.5m above the initial water level depth.
Before the step a1 is executed, the earth surface needs to be cleaned, the underground pipelines and the geological conditions are found out firstly, after the site conditions are clarified, the surface layer miscellaneous filling soil is cleaned to the original sandy soil layer, the surface layer miscellaneous filling soil is dug to be 0.5 meter above the initial water level, and the step a1 is executed on the cleaned site.
B, conveying the mud and the silt clamped in the mud into a concrete caisson 1 with a bottom at the lower part by using a hollow drill rod 5, and after the silt is precipitated, feeding separated water into a main water inlet pipe 6 and a first high-pressure water spraying pipe 7 for recycling;
the circulating slurry pump drilling machine 12 pumps the silt slurry of the soil layer at the bottom of the caisson into the concrete caisson 1 with the bottom at the lower part by using the hollow drill rod 5, under the action of gravity, silt and water are separated in the concrete caisson 1 with the bottom at the lower part, the silt is precipitated in the concrete caisson 1 with the bottom at the lower part, and the water stays at the upper part of the concrete caisson 1 for recycling, the hollow drill rod 5 pumps the silt slurry into the concrete caisson 1 with the bottom at the lower part, so that the self weight of the concrete caisson 1 with the bottom at the lower part is increased, the sinking speed of the concrete caisson 1 with the bottom at the lower part is accelerated, and the operation efficiency is further improved. When the liquid level in the caisson is higher than the upper port of the main water inlet pipe 6, water separated out from the slurry automatically flows downwards along the main water inlet pipe 6 to work together with the drill bit 8, and sand and soil below the concrete caisson 1 are punched.
The high-pressure water pump 11 pumps water separated from the upper part in the caisson, and the water is conveyed to the lower part of the concrete caisson 1 with the bottom through the first high-pressure water spraying pipe 7 to wash sand and soil below the concrete caisson 1 with the bottom, so that the water can be recycled, the concrete caisson 1 with the bottom is arranged at the lower part of the concrete caisson 1 with the bottom, the side wall of the concrete caisson 1 with the bottom is provided with the second high-pressure water spraying pipe 10, the high-pressure water pump 11 also conveys high-pressure water to the lower part of the concrete caisson 1 with the bottom through the second high-pressure water spraying pipe 10, and the sand and soil at the edge of the lower part of the concrete caisson 1 with the bottom can.
The second high-pressure water spraying pipe 10, the main water inlet pipe 6 and the first high-pressure water spraying pipe 7 spray water together, so that sand and soil at each angle below the concrete caisson 1 with the bottom can be washed, the upper continuous concrete caisson 2 is ensured to descend uniformly, the inclination is prevented, and the construction safety is improved; because the water is continuously recycled, the environmental pollution is less.
C, stacking an upper continuous concrete caisson 2 on the top of the lower bottom-containing concrete caisson 1 after the lower bottom-containing concrete caisson 1 descends to a preset height;
after the lower bottom concrete caisson 1 is descended to a preset height, the upper continuous concrete caisson 2 is superposed on the top of the lower bottom concrete caisson 1, the lower bottom concrete caisson 1 and the upper continuous concrete caisson 2 form a soil retaining, waterproof and horizontal supporting integrated structure, collapse, water seepage and the like are prevented, and because a horizontal supporting device is not needed, the cost is reduced, and the construction safety is improved.
D, repeating the step a, the step b and the step c in sequence until the bottom type concrete caisson descends to the designed depth;
by adopting a new self-weight forced landing and circular scouring construction process, the caisson can be sunk while digging, and the depth of 15-50 meters can be easily reached.
And e, plugging the through hole by using high-pressure cement paste.
After the bottom concrete caisson is lowered to the designed depth, the circulating slurry pumping pump drilling machine 12 utilizes the hollow drill rod 5 to inject the cement slurry under high pressure into the lower part of the upper continuous concrete caisson 2, and the through hole is blocked.
And executing step f while executing step e: and injecting cement slurry into the outer sides of the lower bottom-containing concrete caisson 1 and the upper continuous concrete caisson 2, and solidifying the side walls of the lower bottom-containing concrete caisson 1 and the upper continuous concrete caisson 2 with the ground layer.
In order to avoid that the buoyancy generated by underground water to the caisson affects the stability of the caisson, cement slurry is injected into the outer sides of the concrete caisson 1 with the bottom at the lower part and the concrete caisson 2 connected to the upper part, and the side walls of the concrete caisson 1 with the bottom at the lower part and the concrete caisson 2 connected to the upper part are fixedly connected with the ground layer, so that the friction force is greatly increased, an anti-floating structure is formed, and the anti-floating requirement is met. The concrete caisson can be constructed under the geological condition of high underground water level by the technology without precipitation operation, the construction method is safe and reliable, fast and simple, the cost is greatly reduced, the occupied area is small, and the environmental pollution is reduced.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (7)
1. A kind of concrete caisson with bottom that can be forced to descend from aggravating, the concrete caisson with bottom that can be forced to descend from aggravating includes the concrete caisson with bottom of the inferior part and multiple upper portions continues the concrete caisson, the said inferior part has the top opening of the concrete caisson, the bottom of the concrete caisson with bottom of the said inferior part has concrete caisson floors, multiple said upper portions continue the concrete caisson to superpose on the top of the concrete caisson with bottom of the inferior part sequentially; the self-weighted forced-landing bottom-closed concrete caisson is characterized by further comprising at least one reverse circulation slurry pumping drilling machine assembly, wherein at least one through hole is formed in a bottom plate of the concrete caisson, a circle of steel plate blade legs are arranged at the edge of the bottom-closed concrete caisson at the lower part of the bottom of the concrete caisson, the reverse circulation slurry pumping drilling machine assembly comprises a hollow drill rod, a main water inlet pipe and a plurality of first high-pressure water spray pipes, the upper end of the main water inlet pipe extends upwards, the lower end of the main water inlet pipe correspondingly penetrates through the through hole one by one and then extends downwards, the hollow drill rod is rotatably inserted into the middle of the main water inlet pipe, a drill bit is arranged at the lower end of the hollow drill rod, an annular space gap is formed between the inner wall of the main water inlet pipe and the hollow drill rod, the plurality of first high-pressure water spray pipes are arranged on the, the upper end of the first high-pressure water spray pipe extends upwards; and a plurality of second high-pressure water spraying pipes are vertically arranged in the side walls of the lower bottom-containing concrete caisson and the upper continuous concrete caisson at intervals.
2. A self-weighted forced-landing bottom concrete caisson according to claim 1, wherein the lower bottom concrete caisson and the upper continuous concrete caisson are rectangular parallelepiped box bodies, the lower bottom concrete caisson has a height of 2-3m, and the upper continuous concrete caisson has a height of 3-4 m.
3. A self-weighted forced landing bottomed concrete caisson of claim 2, wherein the steel plate blade leg is welded or bolted to the lower bottomed concrete caisson.
4. A construction method of a self-weighted forced-landing bottom concrete caisson is characterized by comprising the following steps:
step a, a circulating slurry pumping pump drilling machine drives a hollow drill rod to rotate, a drill bit cuts sandy soil on the lower part of a concrete caisson with a bottom at the lower part, a main water inlet pipe and a first high-pressure water spraying pipe spray high-pressure water to the lower part of the concrete caisson with a bottom at the lower part to wash the sandy soil, and meanwhile, the hollow drill rod is used for pumping slurry to form reverse circulation;
b, conveying the mud and the silt clamped in the mud to a concrete caisson with a bottom at the lower part by using a hollow drill rod, and after the silt is precipitated, feeding separated water into a main water inlet pipe and a first high-pressure water spray pipe for recycling;
c, stacking an upper continuous concrete caisson on the top of the lower bottom concrete caisson after the lower bottom concrete caisson is descended to a preset height;
d, repeating the step a, the step b and the step c in sequence until the bottom type concrete caisson descends to the designed depth;
and e, plugging the through hole by using high-pressure cement paste.
5. The self-weighted forced-landing bottom-type concrete caisson construction method as claimed in claim 4, wherein step a1 is further performed before step a: and pouring a bottom caisson and a bottomless caisson on the ground surface, and installing a hollow drill rod, a main spray pipe and a first high-pressure spray pipe.
6. The self-weighted forced-landing bottom-type concrete caisson construction method as claimed in claim 5, wherein step a0 is further performed before step a1 is performed: and digging the surface sandy soil layer to a position 0.5m above the initial water level depth.
7. A self-weighted forced-descent closed-bottom concrete caisson construction method as claimed in claim 4, 5 or 6, wherein step e is performed while step f is performed: and injecting cement slurry into the outer sides of the bottom caisson and the bottomless caisson to ensure that the side walls of the bottom caisson and the bottomless caisson are fixedly connected with the stratum.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111691447A (en) * | 2020-05-27 | 2020-09-22 | 武汉建策工程咨询有限公司 | Slow sinking type caisson construction method for reducing load of immersed tube tunnel tube top |
| WO2021243995A1 (en) * | 2020-06-02 | 2021-12-09 | 江西基业科技集团有限公司 | Deep foundation pit retaining wall structure and construction method for underground space structure |
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| CN111691447A (en) * | 2020-05-27 | 2020-09-22 | 武汉建策工程咨询有限公司 | Slow sinking type caisson construction method for reducing load of immersed tube tunnel tube top |
| WO2021243995A1 (en) * | 2020-06-02 | 2021-12-09 | 江西基业科技集团有限公司 | Deep foundation pit retaining wall structure and construction method for underground space structure |
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