CN111155543A - Open caisson isolation bottom die wet type bottom sealing structure and construction method thereof - Google Patents
Open caisson isolation bottom die wet type bottom sealing structure and construction method thereof Download PDFInfo
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- CN111155543A CN111155543A CN202010072839.1A CN202010072839A CN111155543A CN 111155543 A CN111155543 A CN 111155543A CN 202010072839 A CN202010072839 A CN 202010072839A CN 111155543 A CN111155543 A CN 111155543A
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- bottom die
- 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
- E02D2250/00—Production methods
- E02D2250/0007—Production methods using a mold
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention provides a wet bottom sealing structure of an open caisson isolation bottom die and a construction method thereof, wherein the bottom sealing structure is positioned at the bottom of an open caisson well chamber and comprises a wet main body implementation structure and an isolation bottom die structure; the wet main body implementation structure consists of bottom-sealed reinforced concrete and primary-sealed plain concrete; the isolation bottom die structure consists of a steel skeleton, water guide holes and a bottom die, wherein the bottom die is fixed on the steel skeleton, and the bottom die is provided with the water guide holes; the isolation bottom die structure is arranged on bottom sludge of the open caisson, the bottom die faces downwards, the steel skeleton faces upwards, primary seal plain concrete is poured on the isolation bottom die structure, and bottom seal reinforced concrete is poured on the primary seal plain concrete. When the method is adopted for construction, the sludge is isolated by adopting an isolation technology when the open caisson is sealed, so that the sludge in the open caisson cannot be mixed to meet the strength requirement during concrete pouring construction, and after the pouring is finished, the isolation layer and the bottom sealing plain concrete are combined to form a bottom sealing structure to resist the sludge, thereby not only enhancing the strength of the designed bottom sealing, but also ensuring the engineering quality.
Description
The technical field is as follows:
the invention relates to a wet bottom sealing structure of an open caisson isolation bottom die and a construction method thereof, which are mainly used for open caisson bottom sealing construction.
Background art:
the open caisson is more and more widely applied to underground engineering and municipal basic buildings due to the characteristics of small construction occupied area, simple and convenient manufacture, low monomer manufacturing cost, high quality, small influence on peripheral buildings and the like, and particularly, the open caisson has higher underground water level and poorer geological conditions and cannot adopt engineering environments such as large excavation and the like. In a soft soil layer made of silt, because the silt in the open caisson continuously upwells and the open caisson is over-sunk, bottom sealing cannot be carried out; the conventional curing soft soil foundation, foundation pit enclosing method and wet bottom sealing construction treatment method have the problems of high construction cost, large disturbance to surrounding structures, high construction danger, difficult bottom sealing quality guarantee and the like.
The invention content is as follows:
the invention provides an open caisson isolation bottom die wet type bottom sealing structure and a construction method thereof, which are researched and proposed aiming at the defects in the prior construction method.
In order to solve the problems, the invention adopts the technical scheme that:
the invention provides a wet bottom sealing structure of an open caisson isolation bottom die, which comprises a wet main body implementation structure and an isolation bottom die structure, wherein the wet main body implementation structure and the isolation bottom die structure are positioned at the bottom of an open caisson well chamber; the wet main body implementation structure consists of bottom-sealed reinforced concrete and primary-sealed plain concrete; the isolation bottom die structure consists of a steel skeleton, water guide holes and a bottom die, the section shape of the bottom die is matched with the section shape of the inner well wall of the open caisson, the size of the bottom die is slightly smaller than that of the inner well wall of the open caisson, the bottom die is fixed on the steel skeleton, and the bottom die is provided with the water guide holes; the isolation bottom die structure is arranged on bottom sludge of the open caisson, the bottom die faces downwards, the steel skeleton faces upwards, primary seal plain concrete is poured on the isolation bottom die structure, and bottom seal reinforced concrete is poured on the primary seal plain concrete.
The cross section of the bottom die is circular and is matched with the shape and the size of the cross section of the well wall in the open caisson.
The cross section of the bottom die is a rectangle matched with the shape and the size of the cross section of the well wall in the open caisson.
The steel skeleton adopts Q235 steel.
The steel skeleton is a well-lattice structure formed by assembling and welding steel bars.
The bottom-sealed reinforced concrete is impermeable concrete.
The bottom die is welded on the steel framework.
A construction method of a wet bottom sealing structure of an open caisson isolation bottom die comprises the following construction steps:
① after the open caisson sinks to the place, the bottom sealing construction can be carried out after the settlement value observation meets the specification requirement.
② injecting water into the well chamber of the open caisson, and after the well chamber is full of water, the long-arm backhoe cleans the sludge in the well chamber to the designed height.
③ after the excavation is finished, the bottom die is fixed on the steel skeleton, a water guide hole is reserved on the bottom die, and the steel skeleton and the bottom die are installed and lowered to reach the designed elevation.
④ the primary seal plain concrete is poured underwater on the upper part of the bottom die, and the concrete pouring can be conduit pouring or pumping pouring.
⑤ after the primary seal plain concrete reaches 90% strength, pumping water and chiseling off excess concrete.
⑥ after the primary sealing is finished, the pouring construction of the bottom sealing reinforced concrete can be carried out, and water is injected into the well chamber for maintenance after the pouring is finished.
Compared with the prior art, the invention has the following beneficial effects:
1. when the invention is adopted for construction, the sludge is isolated by adopting an isolation technology when the open caisson is sealed, so that the sludge in the open caisson can not be mixed and can not meet the strength requirement when the concrete is poured, and the isolation layer and the bottom sealing plain concrete are combined to form a bottom sealing structure to resist the sludge after pouring, thereby not only enhancing the strength of the designed bottom sealing, but also ensuring the engineering quality.
2. Compared with the traditional underwater bottom sealing scheme, the scheme of the invention improves the manual submerging dredging in the well and the underwater guide pipe pouring by building the platform into the way that the steel framework is adopted to resist the pumping pressure and pump concrete directly, thereby avoiding the manual underwater operation under the deep well and further ensuring the safety of constructors.
3. The scheme of the invention has the advantages of simple and convenient construction, high reliability, high construction speed, obvious construction period effect, less loss and low cost.
Description of the drawings:
FIG. 1 is a front view of the structure of the present invention;
FIG. 2 is a schematic view of the structure of the isolation bottom mold of the present invention.
Description of reference numerals:
1-wet main body implementation structure and 2-isolation bottom die structure.
11-well chamber, 12-bottom sealing reinforced concrete, 13-initial sealing plain concrete and 14-bottom sludge.
21-steel skeleton, 22-water guide hole, 23-bottom die.
The specific implementation mode is as follows:
the invention is described in further detail below with reference to the following figures and examples, but without any limitation thereto.
Referring to fig. 1-2, the present invention provides a bottom sealing structure of a caisson isolation bottom die wet type, which includes a wet main body implementing structure 1 and an isolation bottom die structure 2, both of which are located at the bottom of a caisson chamber 11. The wet main body implementation structure 1 is composed of bottom-sealed reinforced concrete 12 and primary-sealed plain concrete 13, wherein the bottom-sealed reinforced concrete 12 is made of impermeable concrete. The isolation bottom die structure 2 consists of a steel skeleton 21, a water guide hole 22 and a bottom die 23; the steel skeleton 21 adopts Q235 steel, adopts an anti-corrosion method of technical steel components, and is assembled and welded into a well grid structure by the Q235 steel; the cross section of the bottom die 23 is matched with the cross section of the inner well wall of the open caisson, and can be in the shape of a circle, a rectangle and the like, and the size of the bottom die 23 is slightly smaller than that of the cross section of the inner well wall of the open caisson; the bottom die 23 is fixed to the steel frame 21, and in this embodiment, the bottom die 23 is welded to the steel frame 21, and the bottom die 23 is provided with the water guide holes 22. The isolation bottom die structure 2 is arranged on bottom mud 14 of the open caisson, the bottom die 23 faces downwards, the steel skeleton 21 faces upwards, primary plain concrete 13 is poured on the isolation bottom die structure 2, and bottom-sealing reinforced concrete 12 is poured on the primary plain concrete 13. The wet main body implementation structure 1 is used for carrying out excavation and bottom sealing construction under the condition that water is injected into a well chamber 11 of an open caisson, and the isolation bottom mold structure 2 isolates bottom sludge 14 and primary seal plain concrete 13.
The construction steps of the back cover structure are as follows:
① after the open caisson sinks to the place, the bottom sealing construction can be carried out after the settlement value observation meets the specification requirement.
② injecting water into the well chamber 11 of the open caisson, after the well chamber 11 is full of water, the long-arm backhoe cleans the sludge in the well chamber 11 to the calculation height.
③ after the excavation is finished, the bottom die 23 is fixed on the steel framework 21, the water guide hole 22 is reserved on the bottom die 23, and the steel framework 21 and the bottom die 23 are installed and lowered to reach the designed elevation.
④ the primary seal plain concrete 13 is poured underwater on the bottom die 23, and the concrete pouring can be conduit pouring or pumping pouring.
⑤ after the primary seal plain concrete 13 reaches 90% strength, pumping water and chiseling off excess concrete.
⑥ after the initial sealing, the pouring construction of the bottom sealing reinforced concrete 12 can be carried out, and water is injected into the well 11 for maintenance after the pouring is finished.
Claims (8)
1. The utility model provides a wet-type back cover structure of die block is kept apart to open caisson, characterized by: the bottom sealing structure comprises a wet main body implementation structure (1) and an isolation bottom die structure (2), which are positioned at the bottom of a well sinking chamber (11); the wet main body implementation structure (1) consists of bottom-sealed reinforced concrete (12) and primary-sealed plain concrete (13); the isolation bottom die structure (2) consists of a steel framework (21), water guide holes (22) and a bottom die (23), the section shape of the bottom die (23) is matched with the cross section shape of the inner well wall of the open caisson, the size of the bottom die (23) is slightly smaller than that of the cross section of the inner well wall of the open caisson, the bottom die (23) is fixed on the steel framework (21), and the water guide holes (22) are formed in the bottom die (23); the isolation bottom die structure (2) is arranged on bottom mud (14) of the open caisson, the bottom die (23) faces downwards, the steel skeleton (21) faces upwards, primary plain concrete (13) is poured on the isolation bottom die structure (2), and bottom-sealing reinforced concrete (12) is poured on the primary plain concrete (13).
2. The open caisson isolation bottom die wet-type bottom sealing construction method according to claim 1, wherein the method comprises the following steps: the cross section of the bottom die (23) is circular and matched with the shape and the size of the cross section of the well wall in the open caisson.
3. The open caisson isolation bottom die wet-type bottom sealing construction method according to claim 1, wherein the method comprises the following steps: the cross section of the bottom die (23) is a rectangle matched with the shape and the size of the cross section of the well wall in the open caisson.
4. The open caisson isolation bottom die wet-type bottom sealing construction method according to claim 1, wherein the method comprises the following steps: the steel skeleton (21) is made of Q235 steel.
5. The open caisson isolation bottom die wet-type bottom sealing construction method according to claim 1, wherein the method comprises the following steps: the steel skeleton (21) is a well grid structure formed by assembling and welding steel bars.
6. The open caisson isolation bottom die wet-type bottom sealing construction method according to claim 1, wherein the method comprises the following steps: the bottom-sealed reinforced concrete (12) is impervious concrete.
7. The open caisson isolation bottom die wet-type bottom sealing construction method according to claim 1, wherein the method comprises the following steps: the bottom die (23) is welded on the steel framework (21).
8. A construction method of a wet bottom sealing structure of an open caisson isolation bottom die is characterized by comprising the following steps: the method comprises the following construction steps:
① after the open caisson sinks to the place, the bottom sealing construction can be carried out after the settlement value observation meets the specification requirement.
② injecting water into the well chamber (11) of the open caisson, after the well chamber (11) is full of water, the long-arm backhoe cleans the sludge in the well chamber (11) to the calculation height.
③ after the excavation is finished, the bottom die (23) is fixed on the steel framework (21), a water guide hole (22) is reserved on the bottom die (23), and the steel framework (21) and the bottom die (23) are installed and lowered to reach the designed elevation.
④ the primary seal plain concrete (13) is poured underwater on the upper part of the bottom die (23), and the concrete pouring can adopt conduit pouring or pumping pouring.
⑤ when the primary seal plain concrete (13) reaches 90% strength after the pouring is finished, pumping water and chiseling excess concrete.
⑥ after the initial sealing is finished, the pouring construction of the bottom sealing reinforced concrete (12) can be carried out, and water is injected into the well chamber (11) for maintenance after the pouring is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010072839.1A CN111155543A (en) | 2020-01-21 | 2020-01-21 | Open caisson isolation bottom die wet type bottom sealing structure and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010072839.1A CN111155543A (en) | 2020-01-21 | 2020-01-21 | Open caisson isolation bottom die wet type bottom sealing structure and construction method thereof |
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| CN111155543A true CN111155543A (en) | 2020-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010072839.1A Pending CN111155543A (en) | 2020-01-21 | 2020-01-21 | Open caisson isolation bottom die wet type bottom sealing structure and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216234A (en) * | 2021-05-20 | 2021-08-06 | 上海市城市建设设计研究总院（集团）有限公司 | Open caisson bottom sealing and bottom plate connecting device and construction method |
| CN114541454A (en) * | 2021-12-17 | 2022-05-27 | 宁波市政工程建设集团股份有限公司 | Counter-force supported open caisson bottom sealing construction method |
-
2020
- 2020-01-21 CN CN202010072839.1A patent/CN111155543A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216234A (en) * | 2021-05-20 | 2021-08-06 | 上海市城市建设设计研究总院（集团）有限公司 | Open caisson bottom sealing and bottom plate connecting device and construction method |
| CN113216234B (en) * | 2021-05-20 | 2023-02-03 | 上海市城市建设设计研究总院（集团）有限公司 | Construction method of open caisson bottom sealing and bottom plate connecting device |
| CN114541454A (en) * | 2021-12-17 | 2022-05-27 | 宁波市政工程建设集团股份有限公司 | Counter-force supported open caisson bottom sealing construction method |
| CN114541454B (en) * | 2021-12-17 | 2024-04-26 | 宁波市政工程建设集团股份有限公司 | Counter-force supported open caisson bottom sealing construction method |
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