CN113863348A - Open caisson construction method - Google Patents
Open caisson construction method Download PDFInfo
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- CN113863348A CN113863348A CN202111392862.XA CN202111392862A CN113863348A CN 113863348 A CN113863348 A CN 113863348A CN 202111392862 A CN202111392862 A CN 202111392862A CN 113863348 A CN113863348 A CN 113863348A
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- 238000010276 construction Methods 0.000 title claims abstract description 86
- 238000009412 basement excavation Methods 0.000 claims abstract description 26
- 239000002689 soil Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 16
- 241000242541 Trematoda Species 0.000 claims description 7
- 241000935974 Paralichthys dentatus Species 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Foundations (AREA)
Abstract
The invention provides a sunk well construction method, which comprises the following steps: constructing a first open caisson structure at a preset open caisson position; excavating a foundation pit in the first open caisson structure; stopping excavating when the first open caisson structure sinks to a first preset degree, and installing a supporting beam; the first open caisson structure naturally sinks by self weight until the supporting beam is contacted with a soil body at the bottom of the foundation pit, and a second open caisson structure is constructed at the top of the first open caisson structure; after the second open caisson structure is constructed, the supporting beam is dismantled; continuously excavating a foundation pit in the first open caisson structure; when first open caisson structure and second open caisson structure wholly sink to the predetermined degree of second, stop the excavation, first open caisson structure and second open caisson structure rely on the dead weight to sink naturally to when sinking to the design elevation naturally, at the bottom of foundation ditch construction pot bottom concrete. The invention can effectively enhance the foundation bearing capacity of the silt soil, improves the stability and the construction convenience of the open caisson, ensures the construction safety, and is suitable for various soil conditions.
Description
Technical Field
The invention relates to the technical field of foundation pit supporting, in particular to a sunk well construction method.
Background
Along with the development and utilization of underground space, open caisson construction methods are increasingly used in the construction of underground structures. However, in the coastal areas with poor geological conditions and muddy soil layers as deep as 30-40m, the bearing capacity of the foundation is poor, and the side frictional resistance of the soil is low, so that the open caisson construction method is not easy to be used for construction. If the open caisson construction method is used for construction, the following problems need to be solved: in the open caisson heightening process, the bearing capacity of the foundation cannot meet the construction requirement; in the sinking process of the open caisson, the side frictional resistance of soil is small, and the sinking speed of the open caisson is uncontrollable.
Disclosure of Invention
In view of the above, the invention provides a method for constructing an open caisson, and aims to solve the problem that the open caisson construction method is not easy to use in the region near the sea in the prior art.
The invention provides a sunk well construction method, which comprises the following steps: a first construction step, constructing a first open caisson structure at a preset open caisson position; a first excavation step of excavating a foundation pit in the first open caisson structure; the method comprises the following steps of (1) installing, stopping excavation and installing a supporting beam when a first open caisson structure sinks to a first preset degree; the supporting beam is abutted to the inner wall, close to the bottom, of the first open caisson structure; a second construction step, wherein the first open caisson structure naturally sinks by means of self weight, and when the first open caisson structure naturally sinks until the support beam is contacted with the soil body at the bottom of the foundation pit, a second open caisson structure is constructed at the top of the first open caisson structure; a dismantling step, namely dismantling the support beam after the construction of the second open caisson structure is completed; a second excavation step, wherein a foundation pit is continuously excavated in the first open caisson structure; and a third construction step, namely stopping excavation when the first open caisson structure and the second open caisson structure integrally sink to a second preset degree, naturally sinking the first open caisson structure and the second open caisson structure by means of dead weight, and constructing pot bottom concrete at the bottom of the foundation pit when the first open caisson structure and the second open caisson structure naturally sink to a designed elevation.
Further, in the open caisson construction method, in the first construction step, the first open caisson structure is annular, and an annular accommodating groove is formed in the inner wall, close to the bottom, of the first open caisson structure.
Further, in the open caisson construction method, in the installing step, the first preset degree is that the top of the first open caisson structure is 0.8-1 m higher than the ground.
Further, in the open caisson construction method, in the installing step, the support beam includes: the main part is of a cross structure, the four connectors are arranged at four end parts of the main part in a one-to-one correspondence mode, the main part is transversely arranged in the first open caisson structure, and the four connectors are abutted to the containing groove.
Further, in the open caisson construction method, in the installation step, when the support beam is installed, the four connectors are placed in the accommodating groove, and then the four end portions of the main body are connected with the four connectors in a one-to-one correspondence manner, so that the main body is abutted against the accommodating groove through the four connectors.
Further, in the open caisson construction method, an end face of each end of the main body is provided with a mounting plate, a plurality of anchor flukes are arranged inside each end of the main body, each anchor fluke is connected with the corresponding mounting plate, and each mounting plate is welded with the corresponding connecting body.
Further, in the open caisson construction method, in the dismantling step, the joints of the main body and the four connectors are cut so as to separate the main body from the four connectors, and the main body and the four connectors are lifted away from the foundation pit.
Further, in the open caisson construction method, in the second construction step, a protruding portion is arranged at the top of the first open caisson structure, a recessed portion is arranged at the bottom of the second open caisson structure, and the recessed portion is connected with the protruding portion in an inserting mode.
Further, in the open caisson construction method, in the third construction step, the second preset degree is that the first open caisson structure and the second open caisson structure are integrally sunk to the adjacent design elevation.
Further, in the open caisson construction method, in the first excavation step and the second excavation step, the foundation pit is excavated by a backhoe excavator.
In the invention, a first open caisson structure is constructed and a foundation pit is excavated in the first open caisson structure, then excavation is stopped when the first open caisson structure sinks to a first preset degree, a supporting beam is installed to support the first open caisson structure through the supporting beam, so that the first open caisson structure is stable, a second open caisson structure is constructed at the top of the first open caisson structure, the height connection of the open caisson structure is realized, the foundation bearing capacity is effectively improved, the supporting counter force is increased, the supporting beam is dismantled, the dead weight of the open caisson is reduced, the sinking speed of the open caisson can be effectively controlled, the construction operation in the foundation pit is facilitated, the construction period is shortened, then the foundation pit is excavated continuously, excavation is stopped when the open caisson structure sinks to a second preset degree integrally, the bottom concrete of the open caisson is constructed after natural sinking, the foundation bearing capacity of silt soil in the open caisson height connection process can be effectively enhanced, and the stability and the construction convenience in the open caisson sinking process are improved, the construction safety of the open caisson is effectively guaranteed, the problem that the open caisson construction method is not easy to use in the sea-facing area in the prior art is solved, the construction method is suitable for various soil conditions, the application range is expanded, the supporting beam can bear the supporting counter force at the bottom of the foundation pit, the whole open caisson structure is supported, and the stability of the whole open caisson structure in the process of connecting the height is guaranteed.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a flow chart of a method for constructing an open caisson according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating the construction of a first open caisson structure in the open caisson construction method according to the embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a crawler crane being lifted out in the open caisson construction method according to the embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a support beam being hoisted in the open caisson construction method according to the embodiment of the present invention;
fig. 5 is a schematic view illustrating a support beam after being installed in the open caisson construction method according to the embodiment of the present invention;
fig. 6 is a schematic diagram of a first open caisson structure after naturally sinking in the open caisson construction method according to the embodiment of the present invention;
fig. 7 is a schematic view illustrating construction of a second open caisson structure in the open caisson construction method according to the embodiment of the present invention;
fig. 8 is a schematic view illustrating a support beam being removed in the open caisson construction method according to the embodiment of the present invention;
fig. 9 is a schematic view illustrating a crawler crane being hoisted in the open caisson construction method according to the embodiment of the present invention;
fig. 10 is a schematic view illustrating excavation of a foundation pit in the open caisson construction method according to the embodiment of the present invention;
fig. 11 is a schematic view of a crawler crane after being lifted out in the open caisson construction method according to the embodiment of the present invention;
fig. 12 is a schematic view of a bottom concrete of a caisson construction method according to an embodiment of the present invention;
fig. 13 is a schematic structural view of a caisson construction method according to an embodiment of the present invention;
fig. 14 is a schematic structural view of a first open caisson structure in the open caisson construction method according to the embodiment of the present invention;
fig. 15 is a schematic top view of a support beam in the open caisson construction method according to the embodiment of the present invention;
fig. 16 is a partial enlarged view of a portion a in fig. 13.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, fig. 1 is a flowchart of a method for constructing an open caisson according to an embodiment of the present invention. As shown in the figure, the open caisson construction method comprises the following steps:
a first construction step S1 is to construct a first caisson structure at a predetermined caisson position.
Specifically, referring to fig. 2, the field is cleaned to be flat, a plain concrete layer is constructed on the ground at a predetermined open caisson position, and the first open caisson structure 1 is constructed on the plain concrete layer.
Referring to fig. 13 and 14, the first caisson structure 1 is annular, and a ring of annular accommodating grooves 11 are formed in an inner wall of the first caisson structure 1 near the bottom, and the accommodating grooves 11 are recessed inwards.
In specific implementation, the inner wall of the bottom (the lower part shown in fig. 1) of the first open caisson structure 1 is inclined, and the inclined state is inclined towards the outer wall of the first open caisson structure 1.
A first excavation step S2 excavates a foundation pit within the first open caisson structure.
Specifically, referring to fig. 2, a crawler crane 8 hoists a backhoe 7 into the interior of the first open caisson structure 1, and the foundation pit 3 is excavated by the backhoe 7, and the first open caisson structure 1 sinks during excavation.
An installation step S3, stopping excavation when the first open caisson structure sinks to a first preset degree, and installing a support beam; wherein, the bracing beam is abutted against the inner wall of the first open caisson structure close to the bottom.
Specifically, referring to fig. 3, the first preset degree is that the top of the first open caisson structure 1 is 0.8m to 1m higher than the ground, that is, when the first open caisson structure 1 sinks to a position where the top of the first open caisson structure 1 is 0.8m to 1m higher than the ground, the backhoe 7 stops excavating the foundation pit 3, and the backhoe 7 is lifted out of the foundation pit 3 by the crawler crane 8. The support beam 4 is then brought into the foundation pit 3 by the crawler crane 8 and the support beam 4 is installed. The support beam 4 may be previously manufactured in the first construction step S1.
Referring to fig. 13, 15 and 16, the support beam 4 includes: a main body 41 and four connecting bodies 42. The main body 41 has a cross structure and is vertically crossed, and specifically, the main body 41 may be formed by vertically crossing two main beams, which are integrally formed. The four connection bodies 42 correspond to the four ends of the main body 41 one by one, and each connection body 42 is disposed at the corresponding end of the main body 41. The main body 41 is transversely disposed in the first caisson structure 1, and the four connecting bodies 42 are all abutted in the accommodating groove 11, so that the main body 41 and the four connecting bodies 42 are abutted on the inner wall of the first caisson structure 1.
Preferably, the end face of each end of the body 41 is provided with a mounting plate 44 and the interior at each end of the body 41 is provided with a plurality of flukes 43. Each fluke 43 at each end of the body 41 is connected to a corresponding mounting plate 44, each mounting plate 44 being welded to a corresponding connecting body 42. Specifically, each mounting plate 44 is welded to a corresponding respective fluke 43. The provision of each fluke 43 enables the mounting plate 44 to be stably connected to the support beam 4, enhancing the anchoring force.
During specific implementation, the framework of the support beam 4 is manufactured firstly, one mounting plate 44 is embedded in the end face of each end portion of the four end portions of the framework in advance, a plurality of anchor flukes 43 are welded on each mounting plate 44, and each anchor fluke 43 is arranged in the framework and corresponds to the four end portions of the framework. Then, concrete is poured into the framework, thereby forming the concrete support beam. In this embodiment, nine flukes 43 are provided at each end of the support beam 4, the nine flukes 43 being in welded connection with the corresponding mounting plate 44.
In particular, each mounting plate 44 may be a steel plate, and each connecting body 42 may be an i-beam.
Referring to fig. 4 and 5, when the support beam 4 is installed, the four connection bodies 42 are first placed in the accommodating groove 11, and then the four end portions of the main body 41 are connected with the four connection bodies 42 in a one-to-one correspondence manner, so that the main body 41 abuts against the accommodating groove 11 through the four connection bodies 42. Specifically, the four connection bodies 42 are placed at positions corresponding to the four ends of the main body 41 in the accommodating groove 11, and the mounting plates 44 at the four ends of the main body 41 are welded to the corresponding connection bodies 42, thereby completing the mounting of the support beam 4.
And a second construction step S4, wherein the first open caisson structure naturally sinks by means of self weight, and when the first open caisson structure naturally sinks to the support beam and contacts with the soil body at the bottom of the foundation pit, a second open caisson structure is constructed at the top of the first open caisson structure.
Specifically, referring to fig. 6, after the installation of the support beam 4 is completed, the first open caisson structure 1 naturally sinks by the self weight of the structure. When naturally sinking to the bottom of the supporting beam 4 and contacting with the soil body at the bottom of the foundation pit 3, the supporting beam 4 is stressed, and the supporting beam 4 supports the first open caisson structure 1, so that the first open caisson structure 1 is stable and does not continue to sink. Referring to fig. 7, at this time, the second open caisson structure 2 is constructed on the basis of the first open caisson structure 1, i.e., the elevation of the open caisson.
More specifically, a steel bar formwork is bound on the top of the first open caisson structure 1, and concrete is poured, so that the construction of the second open caisson structure 2 is realized.
Referring to fig. 13 and 14, it is preferable that the top (upper portion shown in fig. 13) of the first caisson structure 1 is provided with a projection 5, and the bottom (lower portion shown in fig. 13) of the second caisson structure 2 is provided with a recess, which is inserted into the projection 5. Specifically, the convex portion 5 extends away from the first caisson structure 1, and the concave portion is concave toward the top (upper portion shown in fig. 13) of the second caisson structure 2. Like this, can guarantee the stable butt joint between first open caisson structure 1 and the second open caisson structure 2, avoid first open caisson structure 1 and second open caisson structure 2 dislocation mutually, can also play waterproof effect.
In particular, the protrusion 5 may be annular, and correspondingly, the recess may also be annular. The number of the convex portions 5 may be plural, the number of the concave portions is the same as that of the convex portions 5, and each concave portion corresponds to each convex portion 5 one by one, and each convex portion 5 is inserted into the corresponding concave portion.
After the second open caisson structure 2 is constructed, the supporting beam 4 supports the first open caisson structure 1 and the second open caisson structure 2, and at this time, the first open caisson structure 1 and the second open caisson structure 2 cannot sink.
And a dismantling step S5, dismantling the support beam after the construction of the second open caisson structure is completed.
Specifically, referring to fig. 8, the joints of the main body 41 and the four connecting bodies 42 are cut so that the main body 41 is separated from the four connecting bodies 42, and the main body 41 and the four connecting bodies 42 are lifted away from the foundation pit 3.
More specifically, cutting is performed at the welding positions between the mounting plates 44 at the four ends of the main body 41 and the corresponding connecting bodies 42, so that the main body 41 is separated from the four connecting bodies 42. Then, the main body 41 and the four connection bodies 42 are each lifted out of the foundation pit 3 by the crawler crane 8.
And a second excavation step S6, wherein excavation of the foundation pit is continued in the first open caisson structure.
Specifically, referring to fig. 9, after the main body 41 and the four connecting bodies 42 are all lifted out of the foundation pit 3, the backhoe 7 is lifted into the first open caisson structure 1 by the crawler crane 8, and excavation of the foundation pit 3 is continued by the backhoe 7. In the excavation process, the first open caisson structure 1 and the second open caisson structure 2 are integrally sunk.
And a third construction step S7, wherein excavation is stopped when the first open caisson structure and the second open caisson structure are integrally sunk to a second preset degree, the first open caisson structure and the second open caisson structure naturally sink by means of self weight, and pot bottom concrete is constructed at the bottom of the foundation pit when the first open caisson structure and the second open caisson structure naturally sink to a designed elevation.
Specifically, referring to fig. 10, 11 and 12, the second preset degree is that the first open caisson structure 1 and the second open caisson structure 2 are integrally sunk to the adjacent design elevation, that is, when the first open caisson structure 1 and the second open caisson structure 2 are integrally sunk to the adjacent design elevation, the backhoe 7 stops excavating the foundation pit 3, and the backhoe 7 is lifted out of the foundation pit 3 by the crawler crane 8. After standing still, first open caisson structure 1 and second open caisson structure 2 rely on the dead weight effect of structure to sink naturally down, and this process can guarantee that first open caisson structure 1 and second open caisson structure 2's stability sinks, avoids exceeding the design elevation.
When first open caisson structure 1 and second open caisson structure 2 wholly sink naturally to reaching the design elevation, at the bottom of foundation ditch 3 construction pot bottom concrete 6 for whole open caisson stable in structure no longer sinks, whole open caisson construction is accomplished promptly. Then, other structures inside the open caisson can be constructed.
It can be seen that, in this embodiment, a first open caisson structure is constructed and a foundation pit is excavated in the first open caisson structure, then excavation is stopped when the first open caisson structure is sunk to a first preset degree, a supporting beam is installed to support the first open caisson structure through the supporting beam, so that the first open caisson structure is stable, a second open caisson structure is constructed at the top of the first open caisson structure, so that the connection of the open caisson structure is realized, the foundation bearing capacity is effectively improved, the supporting counter force is increased, then the supporting beam is removed, the dead weight of the open caisson is reduced, the sinking speed of the open caisson can be effectively controlled, the construction operation inside the foundation pit is facilitated, the construction period is reduced, then the foundation pit is continuously excavated, excavation is stopped when the open caisson structure is wholly sunk to a second preset degree, and the bottom concrete of the open caisson is naturally sunk, so that the foundation bearing capacity of the silt soil in the open caisson connection process can be effectively enhanced, the stability and the construction convenience of open caisson sinking in-process have been improved, guarantee the construction safety of open caisson effectively, solved among the prior art and faced the difficult problem that uses open caisson construction method in the sea area, this construction method is applicable to various soil property circumstances, has enlarged application scope to, a supporting beam can bear the support counter-force of foundation ditch bottom, and the whole open caisson structure of bearing guarantees to connect the stability of whole open caisson structure in the high-process.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for constructing an open caisson is characterized by comprising the following steps:
a first construction step, constructing a first open caisson structure at a preset open caisson position;
a first excavation step of excavating a foundation pit in the first open caisson structure;
the method comprises the following steps of (1) installing, stopping excavation and installing a supporting beam when the first open caisson structure sinks to a first preset degree; the supporting beam is abutted to the inner wall, close to the bottom, of the first open caisson structure;
a second construction step, wherein the first open caisson structure naturally sinks by means of self weight, and when the first open caisson structure naturally sinks to the supporting beam and contacts with the soil body at the bottom of the foundation pit, a second open caisson structure is constructed at the top of the first open caisson structure;
a dismantling step, namely dismantling the supporting beam after the construction of the second open caisson structure is completed;
a second excavation step, wherein a foundation pit is continuously excavated in the first open caisson structure;
and a third construction step, wherein the first open caisson structure and the second open caisson structure integrally sink to the second preset degree, and the excavation is stopped, the first open caisson structure and the second open caisson structure naturally sink by means of dead weight and naturally sink to the designed elevation, and the bottom construction pot bottom concrete of the foundation pit is constructed at the bottom of the foundation pit.
2. The open caisson construction method of claim 1, wherein in the first construction step,
the first open caisson structure is annular, and an annular accommodating groove is formed in the inner wall, close to the bottom, of the first open caisson structure.
3. The open caisson construction method of claim 2, wherein, in the installing step,
the first preset degree is that the top of the first open caisson structure is 0.8-1 m higher than the ground.
4. The open caisson construction method of claim 2, wherein, in the installing step,
the support beam includes: the main part is of a cross structure, the four connectors are arranged at the four end parts of the main part in a one-to-one correspondence mode, the main part is transversely arranged in the first open caisson structure, and the four connectors are abutted to the containing groove.
5. The open caisson construction method of claim 4, wherein, in the installing step,
when the supporting beam is installed, the four connecting bodies are placed in the accommodating groove, and then the four end parts of the main body are correspondingly connected with the four connecting bodies one by one, so that the main body is abutted to the accommodating groove through the four connecting bodies.
6. The open caisson construction method of claim 4, wherein a mounting plate is provided at an end surface of each end portion of the body, and a plurality of flukes are provided at an inside of each end portion of the body, each of the flukes being connected to a corresponding mounting plate, each of the mounting plates being welded to a corresponding connecting body.
7. The open caisson construction method of claim 4, wherein, in the dismantling step,
and cutting the joints of the main body and the four connectors so as to separate the main body from the four connectors, and hoisting the main body and the four connectors away from the foundation pit.
8. The open caisson construction method of claim 1, wherein in the second construction step,
the top of the first open caisson structure is provided with a protruding part, the bottom of the second open caisson structure is provided with a recessed part, and the recessed part is connected with the protruding part in an inserting mode.
9. The open caisson construction method of claim 1, wherein, in the third construction step,
the second degree of predetermineeing does first open caisson structure with the second open caisson structure is whole to sink to being close to design elevation.
10. The open caisson construction method of claim 1, wherein in the first excavation step and the second excavation step,
and excavating a foundation pit through a backhoe excavator.
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| CN101503879A (en) * | 2009-03-10 | 2009-08-12 | 中国第一冶金建设有限责任公司 | Pre-control method for preventing inclination of sinking well |
| CN101509258A (en) * | 2009-03-10 | 2009-08-19 | 中国第一冶金建设有限责任公司 | Method for precontrolling subsidence slant of sinking well |
| CN102635124A (en) * | 2012-04-23 | 2012-08-15 | 浙江省建工集团有限责任公司 | Construction method aiming to large open caisson in weak soil area |
| CN108999202A (en) * | 2018-08-23 | 2018-12-14 | 中铁六局集团广州工程有限公司 | Prevent the super heavy method and device of open caisson |
| CN111945764A (en) * | 2020-06-30 | 2020-11-17 | 中国二十冶集团有限公司 | Ground anchor press-in type well sinking method |
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Application publication date: 20211231 |