CN113216235A - Construction method for large open caisson water storage settlement - Google Patents
Construction method for large open caisson water storage settlement Download PDFInfo
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- CN113216235A CN113216235A CN202110597100.7A CN202110597100A CN113216235A CN 113216235 A CN113216235 A CN 113216235A CN 202110597100 A CN202110597100 A CN 202110597100A CN 113216235 A CN113216235 A CN 113216235A
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- open caisson
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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
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- General Engineering & Computer Science (AREA)
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- Environmental & Geological Engineering (AREA)
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- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
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Abstract
The invention discloses a construction method for large open caisson impoundment settlement, which comprises the following steps: a) setting out and positioning a leveling field; b) casting a first-stage large open caisson in situ; c) arranging a mud pit and a reservoir; d) arranging an excavator; e) installing a total station; f) preparing the large open caisson before sedimentation; g) a high-pressure water gun is arranged; h) implementing the sedimentation of the first-stage large open caisson; i) casting a second-stage large open caisson in situ; according to the invention, a high-pressure water gun is adopted to form a slurry ring groove at the periphery of the large open caisson, so that the peripheral soil body is collapsed in order, and the soil body is slowly sunk under the action of self weight; the mode of storing water in the large open caisson is adopted, so that the internal and external stress balance of the large open caisson is kept in the sedimentation process, the phenomenon that the large open caisson is inclined due to structural instability of the large open caisson is avoided in the sedimentation process, the influence on the peripheral foundation caused by the fact that underground water flows down and the peripheral collapse of the open caisson is also avoided, and the open caisson has the advantages of good stability, high safety and reliability and high working efficiency.
Description
Technical Field
The invention relates to the construction of underground building walls and building envelopes in the technical field of civil foundation engineering, in particular to a construction method for large open caisson water storage settlement.
Background
In the foundation construction of the construction site, the construction of an underground building enclosure structure is firstly implemented before the excavation of a foundation pit, then precipitation and excavation are implemented in the foundation pit, and after the excavation is finished, the construction of an underground wall structure can be implemented, because the construction process is complex, the cost is high, and the efficiency is low; the construction of the underground wall structure in the prior art is to position the prefabricated or cast-in-place underground wall structure on the ground and dig out the soil at the supporting part inside the underground wall structure, namely, the excavation settlement method, so that the underground wall structure is sunk to the design elevation after overcoming the peripheral frictional resistance by the gravity of the structure per se, and then the construction of a cushion layer and a bottom plate is carried out, the process replaces the construction of the enclosure and the wall structure before the excavation of a foundation pit, and the construction method has the advantages of labor saving and time saving and is very popular; the existing problems are that the requirement of the excavation settlement method on the amount of soil bodies at the support part of the excavated underground wall structure and the uniformity of excavation is very high, otherwise, the underground wall structure is inclined and torn, and once the inclination correction is very difficult; the earth excavation settlement method also tends to induce ground settlement outside the structure.
The prior art also has an example of implementing the whole settlement of an underground wall body by cutting the soil body by high-pressure water injection, and has the problems that a spray head and a water injection pipe are arranged in the wall body structure, the positions of a high-pressure water gun and the spray head cannot be moved, the interconnection and sealing difficulty of water pipes is high when a multi-stage wall body is continuously settled, especially when the underground wall body structure is settled on a soft soil foundation and a sand drift layer, the underground water level is poured and the sand drift layer is locally collapsed, the influence on the surrounding soil body environment is large, the lateral pressure outside the wall body structure is unbalanced, the local instability of the underground wall body structure is also caused, the inclination of the underground wall body structure is caused, and in addition, the construction method is also limited by the depth and is not suitable for the sinking construction of the deeper wall body structure.
Disclosure of Invention
The invention aims to provide a construction method for water storage and sedimentation of a large open caisson aiming at the defects of the prior art, which is suitable for a water injection and sedimentation process of the large open caisson, and is particularly suitable for a soft soil foundation and a quicksand layer foundation. The invention adopts a high-pressure water gun to inject water, and a slurry ring groove is formed at the periphery of the inner wall of the large open caisson, so that the soil body for supporting the large open caisson collapses in order, and the large open caisson sinks slowly under the action of self weight; the large open caisson structure has the advantages of keeping the balance of the internal and external pressed states of the large open caisson structure, avoiding the phenomenon of inclination caused by instability of the large open caisson structure in the sedimentation process, avoiding the influence of groundwater backflow and collapse around the open caisson on the surrounding foundation, along with good stability, high safety and reliability and high working efficiency.
The specific technical scheme for realizing the purpose of the invention is as follows:
a construction method for large open caisson water storage sedimentation is characterized by comprising the following steps:
a) positioning for paying off of flat ground
Leveling a site to be subjected to large open caisson sedimentation, excavating to an original soil layer, positioning and setting the position of the large open caisson sedimentation;
b) cast-in-situ first-stage large open caisson
Erecting a template, distributing ribs, casting or assembling a large open caisson on site according to design requirements until the large open caisson is maintained, arranging a cutting edge at the bottom end of the large open caisson, and arranging a protective cushion block below the cutting edge;
c) a mud pit and a water storage tank are arranged
The method comprises the following steps of arranging a mud pit and connecting a mud pump, arranging a water storage tank and connecting a high-pressure water pump and a water supply pump;
d) and an excavator
Arranging at least one grab excavator at the periphery of the underground wall structure;
e) and installing the total station
Installing a plurality of total stations around the position where the large open caisson sedimentation is to be implemented;
f) preparation before sedimentation of large open caisson
For the multi-stage large open caisson structure, performing step-by-step settlement operation, firstly removing a template of a first-stage large open caisson after maintenance is completed, and taking out a protective cushion block below a cutting edge of the large open caisson;
g) high-pressure water gun
Selecting a plurality of high-pressure water guns which are uniformly distributed on the periphery of the inner wall of the large open caisson, wherein each high-pressure water gun comprises a spray head, a high-pressure water pipe and a guide rod, the spray heads are arranged at the ends of the high-pressure water pipes, the guide rods are bound on the high-pressure water pipes, and the arrangement of the high-pressure water guns is finished;
h) and implementing the sedimentation of the first-stage large open caisson
Starting a high-pressure water pump, spraying high-pressure water by a spray head of a high-pressure water gun, and impacting the soil body below the cutting edge of the large open caisson by the high-pressure water to form a slurry ring groove on the soil body at the bottom of the large open caisson, so that the soil body supporting the large open caisson collapses in order, and the large open caisson slowly sinks under the action of self weight;
in the sedimentation process of the large open caisson:
pumping the slurry in the large-scale sinking well to a slurry pool by a slurry pump;
digging out soil in the large-scale sinking well by a grab excavator;
along with the sinking of the large open caisson, a water supply pump is used for supplying water into the large open caisson, and the water level of the water stored in the large open caisson is controlled not to be lower than the elevation of the horizon;
monitoring the dynamic verticality of the sinking of the large open caisson by using a total station, controlling and adjusting the dynamic verticality in the sinking process by adjusting the flow of the high-pressure water gun and the distribution of the high-pressure water gun on the periphery of the inner wall of the large open caisson until the first-stage large open caisson is settled to reach the designed elevation, closing the high-pressure water pump to stop spraying water by a spray head of the high-pressure water gun, and continuously controlling the water level of water stored in the large open caisson to be not lower than the elevation of the ground;
i) cast-in-situ second-stage large open caisson
Erecting a template, arranging ribs, casting and tamping on site or assembling a second-stage large open caisson on the basis of the first-stage large open caisson, and performing waterproof treatment on the joint of the two-stage large open caisson until the second-stage large open caisson is maintained, and repeating the steps: g) a high-pressure water gun is arranged; h) the step of implementing the sedimentation of the second-stage large open caisson, and the high-pressure water pump is restarted to implement the sedimentation again; and completing the rest large open caisson stages in sequence until the final large open caisson stage is completely submerged;
and after all the large open caisson subsides to the designed elevation, grouting reinforcement treatment is carried out on the periphery of the inner wall and the outer wall of the large open caisson, and grouting reinforcement is completed until the maintenance period is reached, so that other projects and bottom plate construction in the large open caisson can be implemented.
The invention adopts a high-pressure water gun to form a slurry ring groove at the periphery of the underground wall structure, so that the soil body for supporting the underground wall structure is collapsed in order, the underground wall structure is slowly sunk under the action of self weight, and the construction of the underground wall and the enclosure structure of the underground building is realized; the large open caisson structure has the advantages of keeping the balance of the internal and external pressed states of the large open caisson structure, avoiding the phenomenon of inclination caused by instability of the large open caisson structure in the sedimentation process, avoiding the influence of groundwater backflow and collapse around the open caisson on the surrounding foundation, along with good stability, high safety and reliability and high working efficiency.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a plan view of the large open caisson and the high pressure water gun of the present invention;
FIG. 3 is a schematic view of the cross-sectional structure A-A of FIG. 2;
fig. 4 is a schematic view of the use state of grouting reinforcement completed by settlement of an underground wall structure.
Detailed Description
Example (b):
referring to fig. 1, 2 and 3, the construction of the underground large open caisson 1 in a certain construction site is taken as an example, and the implementation process of the invention is further explained as follows:
a) positioning for paying off of flat ground
Leveling a site where large open caisson 1 sedimentation is to be implemented, excavating to an original soil layer, positioning and setting out to set the sedimentation position of the large open caisson 1;
b) cast-in-situ first-stage large open caisson
Erecting a template, distributing ribs, casting or assembling the large open caisson 1 on site according to design requirements until the large open caisson 1 is maintained, arranging a cutting edge at the bottom end of the large open caisson 1, and arranging a protective cushion block below the cutting edge;
c) a mud pit and a water storage tank are arranged
A mud pool 4 is arranged and connected with a mud pump 41, a water storage tank 5 is arranged and connected with a high-pressure water pump 51 and a water supply pump 52 for standby;
d) and an excavator
At least one grab excavator 6 is arranged at the periphery of the underground wall structure 1;
e) and installing the total station
Installing a plurality of total stations 3 around the position where the large open caisson sinking is to be implemented;
f) preparation before sedimentation of large open caisson
For the multi-stage large open caisson structure, performing step-by-step settlement operation, firstly removing a template of a first-stage large open caisson 1 which is maintained, and taking out a protective cushion block under the edge angle of the large open caisson 1;
g) high-pressure water gun
Selecting a plurality of high-pressure water guns 2, uniformly distributing the high-pressure water guns on the periphery of the inner wall of the large-scale open caisson 1, wherein each high-pressure water gun 2 consists of a spray head 21, a high-pressure water pipe 22 and a guide rod 23, the spray heads 21 are arranged at the ends of the high-pressure water pipes 22, the guide rods 23 are bound on the high-pressure water pipes 22, and the arrangement of the high-pressure water guns 2 is finished;
h) and implementing the sedimentation of the first-stage large open caisson
The high-pressure water pump 51 is started, the spray nozzle 21 of the high-pressure water gun 2 sprays high-pressure water, the high-pressure water impacts soil under the cutting edge of the large open caisson 1, so that the soil at the bottom of the large open caisson 1 forms a slurry ring groove, the soil supporting the large open caisson 1 is collapsed in order, and the large open caisson 1 is slowly sunk under the action of self weight;
wherein, in the sedimentation process of the large open caisson 1:
pumping the mud in the large open caisson 1 to a mud tank 4 by using a mud pump 41;
digging out soil in the large open caisson 1 by a grab excavator 6;
along with the sinking of the large open caisson 1, the mud pump 41 pumps out mud in the large open caisson 1, the grab excavator 6 successively excavates soil in the large open caisson 1, meanwhile, the water supply pump 52 supplies water to the large open caisson 1, and the water level of the water stored in the large open caisson 1 is controlled not to be lower than the elevation of the horizon;
monitoring the sinking dynamic verticality of the large open caisson 1 by using a total station 3, controlling and adjusting the dynamic verticality in the sinking process by adjusting the flow of the high-pressure water gun 2 and the density distributed on the periphery of the inner wall of the large open caisson 1 until the first-stage large open caisson 1 is settled to reach the designed elevation, closing the high-pressure water pump 51 to stop spraying water by the spray head 21 of the high-pressure water gun 2, and continuously controlling the water level of the water stored in the large open caisson 1 not to be lower than the elevation of the horizon.
Referring to fig. 1, 2, 3 and 4, the second-stage settling of the large open caisson is implemented,
i) cast-in-situ second-stage large open caisson
Erecting a template, arranging ribs, casting and tamping on site or assembling a second-stage large open caisson 1 on the basis of the first-stage large open caisson 1, performing waterproof treatment on the joint of the two-stage large open caisson 1, and repeating the steps until the second-stage large open caisson 1 is maintained: g) a high-pressure water gun is arranged; h) the step of implementing the sedimentation of the second-stage large open caisson, and the high-pressure water pump 51 is restarted to implement the sedimentation again; and the rest large open caisson 1 stages are completed in sequence until the last large open caisson 1 stage is completely sunk;
and after all the large open caisson 1 is settled to the designed elevation, grouting reinforcement treatment is carried out on the periphery of the inner wall and the outer wall of the large open caisson 1, and grouting reinforcement is completed until the maintenance period is reached, so that other projects and bottom plate construction in the large open caisson 1 can be implemented.
The invention mainly uses the high-pressure water guns 2 uniformly distributed on the periphery of the inner wall of the underground wall structure 1 to implement sedimentation work, and if necessary, the high-pressure water guns 2 arranged on the outer wall of the underground wall structure 1 can be used movably, so that the sedimentation process of the underground wall structure 1 can be controlled and adjusted more effectively.
Claims (1)
1. A construction method for large open caisson water storage sedimentation is characterized by comprising the following steps:
a) positioning for paying off of flat ground
Leveling a site to be subjected to large open caisson (1) sedimentation, excavating to an original soil layer, positioning and setting the sedimentation position of the large open caisson (1) by paying off;
b) cast-in-situ first-stage large open caisson
Erecting a template, arranging ribs, casting or assembling the large open caisson (1) on site according to design requirements until the maintenance of the large open caisson (1) is finished, arranging a cutting edge at the bottom end of the large open caisson (1), and arranging a protective cushion block below the cutting edge;
c) a mud pit and a water storage tank are arranged
A mud pit (4) is arranged and connected with a mud pump (41), a water storage tank (5) is arranged and connected with a high-pressure water pump (51) and a water supply pump (52);
d) and an excavator
At least one grab bucket type excavator (6) is arranged at the periphery of the underground wall structure (1);
e) and installing the total station
Installing a plurality of total stations (3) at the periphery of a position where large open caisson settlement is to be implemented;
f) preparation before sedimentation of large open caisson
For the multi-stage large open caisson structure, performing step-by-step settlement operation, firstly removing a template of a first-stage large open caisson (1) which is maintained, and taking out a protective cushion block below a blade angle of the large open caisson (1);
g) high-pressure water gun
Selecting a plurality of high-pressure water guns (2) which are uniformly distributed on the periphery of the inner wall of the large open caisson (1), wherein each high-pressure water gun (2) consists of a spray head (21), a high-pressure water pipe (22) and a guide rod (23), the spray heads (21) are arranged at the ends of the high-pressure water pipes (22), the guide rods (23) are bound on the high-pressure water pipes (22), and the arrangement of the high-pressure water guns (2) is finished;
h) and implementing the sedimentation of the first-stage large open caisson
Starting a high-pressure water pump (51), spraying high-pressure water from a spray head (21) of a high-pressure water gun (2), and impacting soil mass under the cutting edge of the large open caisson (1) by the high-pressure water to form a slurry ring groove on the soil mass at the bottom of the large open caisson (1), so that the soil mass supporting the large open caisson (1) is collapsed in order, and the large open caisson (1) is slowly sunk under the action of self weight;
wherein, in the sedimentation process of the large open caisson (1):
pumping the slurry in the large open caisson (1) to a slurry pool (4) by a slurry pump (41);
digging out soil in the large open caisson (1) by a grab excavator (6) in sequence;
along with the sinking of the large open caisson (1), supplying water into the large open caisson (1) by using a water supply pump (52), and controlling the water level of the water stored in the large open caisson (1) not to be lower than the elevation of the horizon;
monitoring the sinking dynamic verticality of the large open caisson (1) by using a total station (3), controlling and adjusting the dynamic verticality in the sinking process by adjusting the flow of the high-pressure water gun (2) and the distribution of the high-pressure water gun on the periphery of the inner wall of the large open caisson (1) until the first-stage large open caisson (1) is settled to reach the designed elevation, closing the high-pressure water pump (51) to stop the spray of water by the spray nozzle (21) of the high-pressure water gun (2), and continuously controlling the water level of the water stored in the large open caisson (1) not to be lower than the elevation of the horizon;
i) cast-in-situ second-stage large open caisson
Erecting a template, arranging ribs, casting and tamping on site or assembling a second-stage large open caisson (1) on the basis of the first-stage large open caisson (1), and performing waterproof treatment on the joint of the two-stage large open caisson (1) until the second-stage large open caisson (1) is maintained, and repeating the steps: g) a high-pressure water gun is arranged; h) the step of implementing the sedimentation of the second-stage large open caisson, and the high-pressure water pump (51) is restarted to implement the sedimentation again; and the rest large open caisson stages (1) are completed in sequence until the last large open caisson stage (1) is completely submerged;
and after all the large open caisson (1) is settled to the designed elevation, grouting reinforcement treatment is carried out on the periphery of the inner wall and the outer wall of the large open caisson (1), and other projects and bottom plate construction in the large open caisson (1) can be implemented until the grouting reinforcement is completed and the maintenance period is reached.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114687347A (en) * | 2022-03-22 | 2022-07-01 | 中铁建大桥工程局集团南方工程有限公司 | Automatic deviation correcting device for open caisson construction |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102505703A (en) * | 2011-11-23 | 2012-06-20 | 中铁大桥局集团第二工程有限公司 | Construction method of fast water injection and implantation of large steel open caisson |
| CN105239577A (en) * | 2015-09-09 | 2016-01-13 | 冯克俊 | Method for carrying out settlement of underground wall structure by means of high-pressure water guns |
| CN110805053A (en) * | 2019-11-05 | 2020-02-18 | 武汉市市政建设集团有限公司 | Construction method of deep foundation pit open caisson self-sinking supporting system |
| CN212077995U (en) * | 2019-12-06 | 2020-12-04 | 郑兰苔 | Water conservancy is towards sinking open caisson construction equipment |
-
2021
- 2021-05-31 CN CN202110597100.7A patent/CN113216235A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102505703A (en) * | 2011-11-23 | 2012-06-20 | 中铁大桥局集团第二工程有限公司 | Construction method of fast water injection and implantation of large steel open caisson |
| CN105239577A (en) * | 2015-09-09 | 2016-01-13 | 冯克俊 | Method for carrying out settlement of underground wall structure by means of high-pressure water guns |
| CN110805053A (en) * | 2019-11-05 | 2020-02-18 | 武汉市市政建设集团有限公司 | Construction method of deep foundation pit open caisson self-sinking supporting system |
| CN212077995U (en) * | 2019-12-06 | 2020-12-04 | 郑兰苔 | Water conservancy is towards sinking open caisson construction equipment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114687347A (en) * | 2022-03-22 | 2022-07-01 | 中铁建大桥工程局集团南方工程有限公司 | Automatic deviation correcting device for open caisson construction |
| CN114687347B (en) * | 2022-03-22 | 2024-03-22 | 中铁建大桥工程局集团南方工程有限公司 | Automatic deviation correcting device for open caisson construction |
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