CN110863505A - Open caisson suitable for geological conditions of deep water-rich sand layer - Google Patents
Open caisson suitable for geological conditions of deep water-rich sand layer Download PDFInfo
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- CN110863505A CN110863505A CN201911222911.8A CN201911222911A CN110863505A CN 110863505 A CN110863505 A CN 110863505A CN 201911222911 A CN201911222911 A CN 201911222911A CN 110863505 A CN110863505 A CN 110863505A
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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
- E02D23/16—Jointing caissons to the foundation soil, specially to uneven foundation soil
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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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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention provides a sunk well suitable for geological conditions of a deep water-rich sand layer, and relates to the technical field of sunk well construction. The invention aims to provide the open caisson suitable for the geological conditions of the water-rich sand layer, which has a stable structure and is not easy to crack in the sinking process; through set up the steel sheet pile structure in the soil around the open caisson body, cut off rich water sand bed and open caisson body, can effectively reduce open caisson body soil pressure all around, be favorable to the open caisson body to sink, and beat and establish steel sheet pile simple process and cheap, can effectively save cost and time limit for a project.
Description
Technical Field
The invention relates to the technical field of sinking construction, in particular to a sunk well suitable for geological conditions of a deep water-rich sand layer.
Background
During the sinking process of the open caisson, uneven sinking occurs inevitably, and when the uneven sinking is serious, the well piece is cracked, so that the open caisson cannot sink.
In the conventional technology, thixotropic slurry is injected into soil bodies which are in contact with the open caisson well sheets, so that the frictional resistance between the well sheets of the special-shaped open caisson and the surrounding soil bodies is reduced, and the open caisson is enabled to smoothly sink.
However, this approach is not suitable for open caisson in water-rich sand geological conditions because thixotropic mud tends to run off in water-rich sand and is difficult to work with.
Therefore, the open caisson is difficult to sink in water-rich sand geological conditions.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide the open caisson applicable to the geological conditions of the water-rich sand layer, which has a stable structure and is not easy to crack in the sinking process. In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme to realize:
the invention provides a sunk well suitable for geological conditions of a deep water-rich sand layer, which comprises a sunk well body, wherein the sunk well body is formed by splicing a plurality of sunk well segments from bottom to top, the sunk well body is installed in a soil body, the soil body comprises the water-rich sand layer, steel sheet piles for enclosing the sunk well body are arranged in the soil body, and the steel sheet piles penetrate through the water-rich sand layer.
Advantageously or exemplarily, the height of the caisson body is 13.5m, and the distance between the steel sheet piles and the caisson body is 1.5 m.
Beneficially or exemplarily, the open caisson body is a special-shaped open caisson, the cross section of the special-shaped open caisson is polygonal, and the special-shaped open caisson comprises a plurality of sections of well sheets which are connected in sequence, and the left end face and the right end face of one well sheet are respectively connected with the other well sheet.
Advantageously or exemplarily, a first reinforcing structure and a second reinforcing structure are arranged in the open caisson section, the first reinforcing structure is arranged in the open caisson section and used for increasing the strength of the wall surface of the open caisson, and the second reinforcing structure is arranged at the joint of the two open caisson sections and used for increasing the strength of the joint of the two open caisson sections.
Advantageously or exemplarily, the first reinforcing structure comprises a first channel, a first tensioning member and a first anchoring member, the two ends of the first channel are open and close to the left and right end surfaces of the well plate, the first tensioning member is arranged in the first channel, the two ends of the first tensioning member respectively protrude out of the two ends of the first channel, and the first anchoring member is tensioned and fixed at the two ends of the first channel.
Advantageously or exemplarily, the second reinforcement structure comprises a second channel, a second tensioning member and a second anchor member, the second channel is curved and has two end openings respectively arranged in two adjoining well plates, the second tensioning member is arranged in the second channel, and has two ends respectively protruding out of the two end openings of the second channel, and is tensioned and fixed at the two end openings of the second channel by the second anchor member.
Advantageously or exemplarily, the first and second reinforcement structures are provided in sets distributed from an upper side to a lower side of one of the caisson sections.
The various embodiments of the invention have the following beneficial effects:
1. according to the invention, the steel sheet pile structure is arranged in the soil around the open caisson body to separate the water-rich sand layer from the open caisson body, so that the soil pressure around the open caisson body can be effectively reduced, the open caisson body can be sunk, the steel sheet pile driving process is simple and cheap, and the cost and the construction period can be effectively saved.
2. The open caisson body provided by the invention is the special-shaped open caisson, so that the uneven sinking of the special-shaped open caisson in the geological condition of the water-rich sand layer can be greatly reduced, and the crack generated in the sinking process of the special-shaped open caisson is avoided.
3. The first reinforcing structure and the second reinforcing structure are arranged to reinforce the well plates of the special-shaped open caisson and the joints of the well plates, so that the structural stability of the special-shaped open caisson is improved, and when uneven sinking occurs, the acting force of soil bodies of the water-rich sand layer on the wall of the open caisson can be effectively resisted, so that no crack is generated in the open caisson.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a plan view of a caisson adapted for use in geological conditions of a deep water-rich sand formation, according to an embodiment of the invention;
FIG. 2 is a cross-sectional view of a caisson adapted for use in geological conditions of a deep water-rich sand formation, in accordance with an embodiment of the present invention;
FIG. 3 is an enlarged view at A of FIG. 2 of a caisson adapted for use in geological conditions of a deep water-rich sand formation according to an embodiment of the invention;
FIG. 4 is a schematic illustration of an open caisson installation for use in geological conditions of a deep water-rich sand formation according to an embodiment of the invention;
reference numerals: 1-an open caisson body; 2-open caisson section; 3-well plate; 4-a first reinforcing structure; 41-a first channel; 42-a first tension member; 43-a first anchor; 5-a second reinforcing structure; 51-a second channel; 52-a second tension member; 53-a second anchor; 6-steel sheet piles; 7-soil body; 8-water-rich sand layer.
Detailed Description
The invention is further described below with reference to the following examples in conjunction with the accompanying drawings.
The invention provides a sunk well suitable for geological conditions of a deep water-rich sand layer, which comprises a sunk well body 1, wherein the sunk well body 1 is formed by splicing a plurality of sunk well segments 2 from bottom to top, the sunk well body 2 is arranged in a soil body 7, the soil body 7 comprises a water-rich sand layer 8, a steel sheet pile 6 for shielding the sunk well body 1 is arranged in the soil body 7, and the steel sheet pile 6 penetrates through the water-rich sand layer 8.
This embodiment sets up the structure of steel sheet pile 6 in the soil body 7 around open caisson body 1, cuts off rich water sand 8 and open caisson body 1, can effectively reduce open caisson body 1 soil pressure all around, has reduced the inhomogeneous degree of open caisson body 1 in-process that sinks, is favorable to open caisson body 1 to sink, and beats and establish steel sheet pile 6 simple process and cheap, can effectively save cost and time limit for a project.
In one embodiment, the open caisson body 1 is manufactured as follows:
leveling field → surveying and laying → constructing a steel plate pile 6 → excavating a foundation pit → tamping a base → paving a sand cushion layer → pouring a concrete cushion layer → building a cutting foot brick seat → installing cutting foot steel bars → supporting cutting feet and well body templates → manufacturing a first open caisson segment and a second open caisson segment → maintaining, removing a mold → sinking preparation work → sinking soil of a long arm excavator → observing and rectifying → sinking to a design elevation-3.5 m of a fine sand layer → manufacturing a third open caisson segment and a fourth open caisson segment → manufacturing a long arm excavator matching with the grab excavator to sink the soil → observing and rectifying → sinking to a coarse sand layer (design elevation-13.5 m) → manufacturing the fifth concrete of the open caisson → manufacturing the soil of the grab excavator → sinking to the design elevation, the calibration elevation → underwater concrete sealing bottom → binding bottom plate → pouring a steel bar → subsequent construction.
Wherein steel sheet piles 6 are provided before the first open caisson section 2 is manufactured.
In one embodiment, the elevation of the caisson body 1, the number of the caisson sections 2, the size of the caisson sections 2, and the size and position of the steel sheet piles 6 are set according to the construction project requirements. In one embodiment, the height of the open caisson body 1 is 13.5m, and the distance between the steel sheet pile 6 and the open caisson body 1 is 1.5m, and in another embodiment, the height of the open caisson body 1 and the distance between the steel sheet pile 6 and the open caisson body 1 can meet the requirement of blocking the open caisson body 1 and the water-rich sand layer 8.
In one embodiment, the open caisson body 1 is a special-shaped open caisson, the cross section of the special-shaped open caisson is a polygon, and the open caisson comprises a plurality of sections of well sheets 3 which are sequentially connected, and the left end face and the right end face of one well sheet 3 are respectively connected with the other well sheet 3.
The special-shaped open caisson is a non-circular, non-rectangular and non-square irregular open caisson designed according to actual use scenes, and the cross section of the special-shaped open caisson is a polygon.
When the special-shaped open caisson is settled in the water-rich sand layer, the special-shaped open caisson is more prone to deflection when being settled compared with a regular round or rectangular open caisson due to the fact that the special-shaped open caisson is uneven in mass distribution, and therefore cracks are generated in the open caisson well piece 3 in the process of settlement, and even the open caisson cannot be settled.
Therefore, when the special-shaped open caisson is sunk, the steel sheet pile 6 is configured to have a structure that enables the special-shaped open caisson to be sunk smoothly. In an embodiment, the steel sheet piles 6 are provided with a plurality of groups, and the open caisson body 1 and the water-rich sand layer 8 of the special-shaped open caisson are isolated by a plurality of layers to form a good isolation effect and reduce the soil pressure of the water-rich sand layer 8 on the open caisson body 1 of the special-shaped open caisson.
In the embodiment, uneven sinking of the special-shaped open caisson in the geological condition of the water-rich sand layer 8 can be greatly reduced, and cracks are prevented from being generated in the sinking process of the special-shaped open caisson.
In one embodiment, a first reinforcing structure 4 and a second reinforcing structure 5 are arranged in the open caisson segment 2, the first reinforcing structure 4 is arranged in the well plate 3 and used for increasing the strength of the wall surface of the well plate 3, and the second reinforcing structure 5 is arranged at the joint of the two well plates 3 and used for increasing the strength of the joint of the two well plates 3.
This embodiment sets up first reinforced structure 4 and second reinforced structure 5, and to the well piece 3 of dysmorphism open caisson to and the department of meeting of well piece 3 consolidates, has improved the structural stability of dysmorphism open caisson, when appearing inhomogeneous sinking, can effectively resist the effort of rich water sand bed 8 to the open caisson wall of a well, makes the open caisson not produce the crack.
In one embodiment, the first reinforcing structure 4 includes a first channel 41, a first tensioning member 42 and a first anchoring member 43, the two end openings of the first channel 41 are respectively close to the left and right end surfaces of the well plate 3, the first tensioning member 42 is disposed in the first channel 41, the two ends of the first tensioning member protrude out of the two end openings of the first channel 41, and the first anchoring member 43 is tensioned and fixed to the two end openings of the first channel 41.
In the well sheet 3, the first tensioning piece 42 which is tensioned improves the structural strength of the well sheet 3, and when the soil body 7 generates soil pressure on the open caisson body 1, the first tensioning piece 42 can resist the soil pressure due to the tensioning prestress of the tensioned first tensioning piece 42, so that the open caisson body 1 is not easy to deform or crack.
In one embodiment, the second reinforcement structure includes a second channel, a second tensioning member, and a second anchoring member, the second channel is curved, two openings of the second channel are respectively disposed in the two connected well plates, the second tensioning member is disposed in the second channel, two ends of the second tensioning member respectively protrude out of two openings of the second channel, and the second tensioning member is tensioned by the second anchoring member and fixed to the two openings of the second channel.
Because the stress concentration easily appears in the junction of two well pieces 3, easily produce the crack, consequently set up the second reinforced structure in the junction of two well pieces 3, avoid producing the crack.
At the joint of the two well sheets 3, the second tensioning member 52 which is tensioned improves the structural strength of the joint of the two well sheets 3, and when soil body 7 generates soil pressure on the joint, the action process is similar to that of the first reinforcing structure, so that the open caisson body 1 is not easy to deform or crack.
In one embodiment, the inner surfaces of the first and second passages 41,51 are provided with internal threads that mate with the first and second tensioning members 42, 52; the first and second tension members 42,52 are high strength rebar; the first and second anchoring members 43,53 are both a combination of nuts and anchoring plates, and the nuts are engaged with high-strength threaded steel bars to press the anchoring plates against the openings of the first and second channels 41, 52.
In one embodiment, the first reinforcing reinforcement 4 and the second reinforcing structure 5 are provided in sets, distributed from the upper side to the lower side of one caisson section 2.
This embodiment, further improved the structural strength of the open caisson body 1 of type for special-shaped open caisson.
In one embodiment, when the caisson section 2 is cast, the first reinforcing structure 4 and the second reinforcing structure 5 are placed in the caisson section 3, and then the caisson section 2 is cast.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. The open caisson applicable to geological conditions of a deep and thick water-rich sand layer is characterized by comprising an open caisson body (1), wherein the open caisson body (1) is formed by splicing a plurality of open caisson segments (2) from bottom to top, the open caisson body (1) is installed in a soil body (7), the soil body (7) comprises a water-rich sand layer (8), a steel sheet pile (6) for enclosing the open caisson body (1) is arranged in the soil body (7), and the steel sheet pile (6) penetrates through the water-rich sand layer (8).
2. The open caisson applicable to geological conditions of a deep water-rich sand layer according to the claim 1, wherein the height of the open caisson body (1) is 13.5m, and the distance between the steel sheet pile (6) and the open caisson body is 1.5 m.
3. The open caisson applicable to geological conditions of a deep and water-rich sand layer as claimed in claim 1, wherein the open caisson body (1) is a special-shaped open caisson, the cross section of the special-shaped open caisson is polygonal, and the open caisson comprises a plurality of sections of well sheets (3) which are sequentially connected, and the left end face and the right end face of one well sheet (3) are respectively connected with the other well sheet (3).
4. Open caisson for geological conditions of deep and water-rich sand layers according to claim 3, wherein the open caisson segment (2) is provided with a first reinforcing structure (4) and a second reinforcing structure (5),
the first reinforcing structure (4) is arranged in the well plate (3) and used for increasing the strength of the wall surface of the well plate (3),
the second reinforcing structure (5) is arranged at the joint of the two well sheets (3) and used for increasing the strength of the joint of the two well sheets (3).
5. Open caisson for geological conditions of deep and water-rich sands according to claim 4, characterised in that said first reinforcement structure (4) comprises a first channel (41), a first tension element (42) and a first anchoring element (43),
the openings at the two ends of the first channel (41) are respectively close to the end faces at the left side and the right side of the well plate (3), the first tensioning piece (42) is arranged in the first channel (41), the two ends of the first tensioning piece respectively protrude out of the openings at the two ends of the first channel (41), and the first tensioning piece is tensioned by the first anchoring piece (43) and fixed at the openings at the two ends of the first channel (41).
6. Open caisson for geological conditions of deep and water-rich sands according to claim 4, characterised in that said second reinforcement structure (5) comprises a second channel (51), a second tensioning element (52) and a second anchoring element (53),
the second channel (51) is bent, openings at two ends of the second channel are respectively arranged in the two connected well sheets (3), the second tensioning piece (52) is arranged in the second channel (51), two ends of the second tensioning piece respectively protrude out of the openings at two ends of the second channel (51), and the second tensioning piece is tensioned by the second anchoring piece (53) and fixed on the openings at two ends of the second channel (51).
7. Open caisson for geological conditions of deep and water-rich sand according to claim 4, characterised in that said first (4) and second (5) reinforcement structures are provided in groups, distributed from the upper side to the lower side of one of said open caisson segments (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911222911.8A CN110863505A (en) | 2019-12-03 | 2019-12-03 | Open caisson suitable for geological conditions of deep water-rich sand layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911222911.8A CN110863505A (en) | 2019-12-03 | 2019-12-03 | Open caisson suitable for geological conditions of deep water-rich sand layer |
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| CN110863505A true CN110863505A (en) | 2020-03-06 |
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| CN201911222911.8A Pending CN110863505A (en) | 2019-12-03 | 2019-12-03 | Open caisson suitable for geological conditions of deep water-rich sand layer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112982423A (en) * | 2021-02-01 | 2021-06-18 | 中国电建集团市政规划设计研究院有限公司 | Special-shaped open caisson construction method |
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| CN108487279A (en) * | 2018-06-13 | 2018-09-04 | 郑州水务建筑工程股份有限公司 | A kind of control in irregular well sinking and method for correcting error |
| JP2018197463A (en) * | 2017-05-24 | 2018-12-13 | 清水建設株式会社 | Co-settlement preventing structure and settling method of caisson |
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2019
- 2019-12-03 CN CN201911222911.8A patent/CN110863505A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102644296A (en) * | 2012-05-09 | 2012-08-22 | 东南大学 | Prefabricate assembly type pipe jacking working well |
| CN105714833A (en) * | 2016-03-01 | 2016-06-29 | 江苏东合南岩土科技股份有限公司 | Construction method of steel plate pile open caisson support |
| JP2018197463A (en) * | 2017-05-24 | 2018-12-13 | 清水建設株式会社 | Co-settlement preventing structure and settling method of caisson |
| CN108487279A (en) * | 2018-06-13 | 2018-09-04 | 郑州水务建筑工程股份有限公司 | A kind of control in irregular well sinking and method for correcting error |
| CN209687494U (en) * | 2019-02-02 | 2019-11-26 | 上海城建水务工程有限公司 | A kind of precast concrete open caisson device for jacking construction |
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