阅读说明：本技术 一种细长沉井结构以及沉井分节下沉的方法 (Slender open caisson structure and method for sinking open caisson in sections ) 是由 刘忠友 俞武华 赵罡 张鸿 于 2020-04-28 设计创作，主要内容包括：本发明涉及沉井工程技术领域,特指一种细长沉井结构以及沉井分节下沉的方法,根据沉井下部压力大、上部压力小的特点,将沉井设计成上节沉井段与下节沉井段两节沉井段,下节沉井段长度占总长度的2/5,在自重作用下沉井基本可将上节沉井沉放到泥面以下一定的深度,此时可借助上节沉井与土的摩阻力及自重通过双作用千斤顶将力传递到下节沉井上,使下节沉井下沉,待下节沉井下沉一定深度后,用双作用千斤顶借助下节沉井的重力及摩阻力牵引上节沉井下沉,由于上节沉井与下节沉井采用双作用千斤顶助沉,沉井的下沉处于可控状态,可避免突沉及旋转,由于不需要压载,施工空间开阔,还可借助于单侧的顶推力纠正沉井的偏沉。(The invention relates to the technical field of open caisson engineering, in particular to a slender open caisson structure and a method for sinking an open caisson in sections, wherein the open caisson is designed into two open caisson sections of an upper open caisson section and a lower open caisson section according to the characteristics of large lower pressure and small upper pressure of the open caisson, the length of the lower open caisson section accounts for 2/5 of the total length, the upper open caisson can be sunk to a certain depth below a mud surface basically under the action of self weight, force can be transmitted to the lower open caisson through a double-acting jack by virtue of the frictional resistance of the upper open caisson and soil and the self weight, so that the lower open caisson sinks, after the lower open caisson sinks to a certain depth, the upper open caisson is pulled to sink by virtue of the gravity and the frictional resistance of the lower open caisson by a double-acting jack, the sinking of the double-acting jack is assisted by the upper open caisson and the lower open caisson, the sinking of the open caisson is in a controllable state, sudden sinking and rotation can be avoided, and ballast is not needed, the construction space is wide, and the deflection of the open caisson can be corrected by means of the pushing force of the single side.)

1. An elongated open caisson structure, comprising: include open caisson (1) that constitutes by last section open caisson section (2) and lower section open caisson section (3) fixed connection, be fixed with embedded steel plate (8) on the near inner wall of joint between last section open caisson section (2) and lower section open caisson section (3) respectively, be fixed with steel corbel (9) on embedded steel plate (8), and be fixed with two effect jack (12) fixed connection between steel corbel (9) on last section open caisson section (2) and the steel corbel (9) on lower section open caisson section (3), the joint end between last section open caisson section (2) and lower section open caisson section (3) is fixed with embedded angle steel (6) respectively, the joint outside between last section open caisson section (2) and lower section open caisson section (3) is fixed with steel sheet ring (7), the lower extreme of steel sheet ring (7) welds on embedded angle steel (6) on lower section open caisson section (3), be equipped with water seal type rubber (10) between the upper end of steel sheet ring (7) and the last section open caisson section (2).

2. An elongated caisson structure, according to claim 1, wherein: the lower-section sinking section (3) is provided with a drag reduction platform (4), a bottom plate groove (5) and a sinking well edge foot (13), and the lower-section sinking section (3) occupies 2/5 of the total length of the sinking well (1).

3. An elongated caisson structure, according to claim 1, wherein: the steel bracket (9) is formed by fixedly connecting a reinforcing plate (11) and a support plate (14), the reinforcing plate (11) is respectively fixed on the support plate (14) and an embedded steel plate (8), and the support plate (14) is fixed on a double-acting jack (12).

4. An elongated caisson structure, according to claim 3, wherein: the reinforcing plate (11) is of a right-angled triangle structure, and two right-angled sides of the reinforcing plate (11) are fixed on the support plate (14) and the embedded steel plate (8) respectively.

5. An elongated caisson structure, according to claim 1, wherein: and the double-acting jack (12) is fixed on a steel bracket (9) between the upper section of the sinking well section (2) and the lower section of the sinking well section (3) through bolts.

6. An elongated caisson structure, according to claim 1, wherein: v type rubber water seal (10) include upper V type rubber water seal (100) and lower V type rubber water seal (101), upper V type rubber water seal (100) are through the sticky subsides of bonding on the inner wall of steel sheet ring (7), lower V type rubber water seal (101) are through the sticky subsides of bonding on the lower extreme outer wall of upper segment sinking well section (2).

7. An elongated caisson structure, according to claim 1, wherein: the height of the steel plate ring (7) is about 1000 mm.

8. An elongate open caisson construction, according to any of claims 1 to 7, wherein the method of lowering the caisson in sections comprises the steps of:

the method comprises the following steps: preparing according to the construction steps of the open caisson (1), prefabricating a lower section of the open caisson section (3), sinking the lower section of the open caisson section (3) according to a conventional process after the strength of the lower section of the open caisson section (3) meets the requirement, stopping sinking after the lower section of the open caisson section (3) sinks to a certain depth, placing a partition material at the top of the lower section of the open caisson section (3) to prefabricate an upper section of the open caisson section (2), and burying embedded parts during prefabricating;

step two: after a template of the upper section of the sinking well section (2) is removed, welding a steel plate ring (7) on embedded angle steel (6) at the upper part of the lower section of the sinking well section (3), coating adhesive glue on the lower end of the outer part of the upper section of the sinking well section (2) within the range of about 100mm, pushing a lower V-shaped rubber water seal (101) into the lowest end of the upper section of the sinking well section (2) from top to bottom along the outer wall of the upper section of the sinking well section (2), enabling the adhesive glue to bond the lower V-shaped rubber water seal (101) on the outer wall of the upper section of the sinking well section (2), and bonding the upper V-shaped rubber water seal (100) on the upper part of the inner wall of the steel plate ring (7) by adopting the same method;

step three: welding steel brackets (9) on pre-buried steel plates (8) on the inner wall of the open caisson (1), connecting two ends of a double-acting jack (12) to two corresponding steel brackets (9) on an upper section of the open caisson section (2) and a lower section of the open caisson section (3) by bolts, and communicating the double-acting jack (12) with an oil pump by a pressure pipe;

step four: the method comprises the following steps that (1) the open caisson (1) is continuously sunk by self weight under the excavation construction till an upper open caisson section (2) enters the soil for a certain length, until the open caisson (1) cannot sink under the self weight, an oil pump is started to supply oil to a double-acting jack (12), so that the double-acting jack (12) pushes a lower open caisson section (3) to continue sinking under the excavation construction, the pushing is stopped when the open caisson sinks by about 800mm, the oil supply is reversed, the double-acting jack (12) retracts, the upper open caisson section (2) is pulled to sink by about 800mm, and the open caisson (1) is sunk to the designed elevation repeatedly;

step five: and welding the upper section of the open caisson section (2) and the lower section of the open caisson section (3) into a whole through embedded angle steel (6), removing the double-acting jack (12) and the steel bracket (9) in the open caisson, and constructing the rest open caisson (1).

Technical Field

The invention relates to the technical field of open caisson engineering, in particular to a slender open caisson structure and a method for sinking an open caisson section by section.

Background

The open caisson construction is especially great in length, often can't rely on the dead weight to sink because the coefficient of sinking is big enough when sinking, often needs the ballast, needs a large amount of ballast materials during the ballast, and the ballast material has taken a large amount of construction space, has brought adverse effect for the open caisson construction, and ballasted unbalance also can cause the open caisson incline, and the ballast can produce bad phenomena such as suddenly sinking, is unfavorable for the construction control of open caisson.

Disclosure of Invention

Aiming at the problems, the invention provides a slender open caisson structure and a method for sinking an open caisson in sections, according to the characteristics of large pressure at the lower part and small pressure at the upper part of the open caisson, the open caisson is designed into two open caisson sections of an upper open caisson section and a lower open caisson section, the length of the lower open caisson section accounts for 2/5 of the total length, the upper open caisson section can be basically sunk to a certain depth below a mud surface under the action of self weight, at the moment, the force can be transmitted to the lower open caisson section through a jack by virtue of the frictional resistance of the upper open caisson section and soil and the self weight, so that the lower open caisson section sinks, after the lower open caisson section sinks to a certain depth, a double-acting jack is used for pulling the upper open caisson section to sink by virtue of the gravity and the frictional resistance of the lower open caisson section, and the sinking of the upper open caisson section and the lower open caisson section is assisted by the double-acting jack, so that the sinking of the open caisson is in a controllable state, and the sudden sinking can be avoided, because no ballast is needed, the construction space is wide, and the deflection and sinking of the open caisson can be corrected by means of the jacking force of one side.

In order to achieve the purpose, the technical scheme applied by the invention is as follows:

the utility model provides a long and thin open caisson structure, include the open caisson that comprises upper segment open caisson section and lower segment open caisson section fixed connection, be fixed with embedded steel plate respectively on the near inner wall of joint between upper segment open caisson section and the lower segment open caisson section, be fixed with the steel corbel on the embedded steel plate, and pass through two effect jack fixed connection between the steel corbel on the upper segment open caisson section and the steel corbel on the lower segment open caisson section, the joint end between upper segment open caisson section and the lower segment open caisson section is fixed with embedded angle steel respectively, the joint outside between upper segment open caisson section and the lower segment open caisson section is fixed with the steel sheet ring, the lower extreme of steel sheet ring welds on the embedded angle steel on the lower segment open caisson section, be equipped with V type rubber water seal between the upper end of steel sheet ring and the upper segment open caisson section.

Furthermore, a drag reduction platform, a bottom plate groove and a sunk well blade foot are arranged on the lower sunk well section, and the lower sunk well section occupies 2/5 of the total length of the sunk well.

Furthermore, the steel bracket is formed by fixedly connecting a reinforcing plate and a support plate, the reinforcing plate is respectively fixed on the support plate and the embedded steel plate, and the support plate is fixed on the double-acting jack.

Further, the reinforcing plate adopts a right-angled triangle structure, and two right-angle sides of the reinforcing plate are respectively fixed on the support plate and the embedded steel plate.

Further, the double-acting jack is fixed on a steel bracket between the upper section of the open caisson section and the lower section of the open caisson section through a bolt.

Furthermore, the V-shaped rubber water seal comprises an upper V-shaped rubber water seal and a lower V-shaped rubber water seal, the upper V-shaped rubber water seal is adhered to the inner wall of the steel plate ring through adhesive glue, and the lower V-shaped rubber water seal is adhered to the outer wall of the lower end of the upper section sinking well section through adhesive glue.

Further, the height of the steel plate ring is about 1000 mm.

A method of sinking an elongate caisson structure, comprising the steps of:

the method comprises the following steps: preparing according to the open caisson construction steps, prefabricating a lower open caisson section, sinking the lower open caisson section according to a conventional process after the strength of the lower open caisson section meets the requirement, stopping sinking after the lower open caisson section sinks to a certain depth, placing a partition material at the top of the lower open caisson section to prefabricate an upper open caisson, and burying an embedded part during prefabrication;

step two: after the upper open caisson section template is removed, welding a steel plate ring on embedded angle steel at the upper part of the lower open caisson section, coating adhesive glue on the lower end of the outer part of the upper open caisson section within the range of about 100mm, pushing a lower V-shaped rubber water seal into the lowest end of the upper open caisson section from top to bottom along the outer wall of the upper open caisson section, bonding the lower V-shaped rubber water seal to the outer wall of the upper open caisson by the adhesive glue, and bonding the upper V-shaped rubber water seal to the upper part of the inner wall of the steel plate ring by adopting the same method;

step three: welding steel brackets on the embedded steel plates on the inner wall of the open caisson, connecting two ends of a double-acting jack to two corresponding steel brackets on an upper open caisson section and a lower open caisson section by bolts, and communicating the double-acting jack with an oil pump by a pressure pipe;

step four: the open caisson is continuously sunk by the dead weight under the excavation construction until the upper open caisson section enters the soil for a certain length until the open caisson cannot sink under the dead weight, an oil pump is started to supply oil to a double-acting jack, so that the double-acting jack pushes the lower open caisson section to continue sinking under the excavation construction, the pushing is stopped when the open caisson sinks by about 800mm, the oil supply is reversed, the double-acting jack retracts, the upper open caisson section is pulled to sink by about 800mm, and the open caisson is sunk to the design elevation repeatedly;

step five: and welding the upper section of the open caisson section and the lower section of the open caisson section into a whole through embedded angle steel, removing the double-acting jack and the steel bracket in the open caisson, and performing the rest open caisson construction.

The invention has the beneficial effects that:

1) the invention adopts the structure arrangement, according to the characteristics of large pressure at the lower part of the open caisson and small pressure at the upper part, the open caisson is designed into two open caisson sections of an upper open caisson section and a lower open caisson section, the length of the lower open caisson section accounts for 2/5 of the total length, the upper open caisson section can be basically sunk to a certain depth below a mud surface under the action of self weight, at the moment, the force can be transmitted to the lower open caisson section through a double-acting jack by virtue of the frictional resistance and the self weight of the upper open caisson section and soil, so that the lower open caisson section is sunk, after the lower open caisson section is sunk to a certain depth, the upper open caisson section is dragged to sink by virtue of the gravity and the frictional resistance of the lower open caisson section by virtue of the double-acting jack, the sinking of the double-acting jack is assisted by the upper open caisson section and the lower open caisson section, the sinking is in a controllable state, the sudden sinking and the construction space is opened because no ballast is needed, the deflection and sinking of the open caisson can be corrected by means of the single-side jacking force;

2) the open caisson is sunk by adopting the process, so that the defects of difficult sinking of the open caisson and massive ballast construction can be avoided, the construction controllability is greatly improved, and the open caisson has a wider application prospect;

3) the invention is mainly suitable for the construction of the round open caisson.

Drawings

FIG. 1 is a vertical cross-sectional view of the overall structure of the present invention;

FIG. 2 is a side view of the overall structure of the present invention;

FIG. 3 is a top view of the overall structure of the present invention;

fig. 4 is an enlarged view of a position a in fig. 1.

1. Sinking a well; 2. an upper section of the sinking well section; 3. a lower section sinking section; 4. a drag reduction platform; 5. a floor trough; 6. embedding angle steel in advance; 7. a steel plate ring; 8. pre-burying a steel plate; 9. steel corbels; v-shaped rubber water seal; 11. a reinforcing plate; 12. a double-acting jack; 13. sinking well edge feet; 14. a support plate; 100. an upper V-shaped rubber water seal; 101. and a V-shaped rubber water seal of the next channel.

Detailed Description

The technical solution of the present invention is described below with reference to the accompanying drawings and examples.

As shown in fig. 1 to 4, the slender open caisson structure of the present invention comprises an open caisson 1 formed by fixedly connecting an upper open caisson section 2 and a lower open caisson section 3, wherein an embedded steel plate 8 is respectively fixed on the inner wall near the joint between the upper open caisson section 2 and the lower open caisson section 3, a steel corbel 9 is fixed on the embedded steel plate 8, the steel corbel 9 on the upper open caisson section 2 is fixedly connected with the steel corbel 9 on the lower open caisson section 3 through a double-acting jack 12, and the functions of pushing and pulling the upper open caisson section 2 and the lower open caisson section 3 are realized through the double-acting jack 12. The joint end between the upper section of the open caisson section 2 and the lower section of the open caisson section 3 is respectively fixed with embedded angle steel 6, the outer side of the joint between the upper section of the open caisson section 2 and the lower section of the open caisson section 3 is fixed with a steel plate ring 7, the lower end of the steel plate ring 7 is welded on the embedded angle steel 6 on the lower section of the open caisson section 3, and a V-shaped rubber water seal 10 is arranged between the upper end of the steel plate ring 7 and the upper section of the open caisson section 2. Effectively preventing water flow outside the well from entering the well.

More specifically, the lower open caisson section 3 is provided with a drag reduction platform 4, a bottom plate groove 5 and an open caisson edge leg 13, and the lower open caisson section 3 occupies 2/5 of the total length of the open caisson 1.

More specifically, the steel bracket 9 is formed by fixedly connecting a reinforcing plate 11 and a support plate 14, the reinforcing plate 11 is respectively fixed on the support plate 14 and the embedded steel plate 8, and the support plate 14 is fixed on the double-acting jack 12.

More specifically, the reinforcing plate 11 adopts a right-angled triangle structure, and two right-angled sides of the reinforcing plate 11 are respectively fixed on the support plate 14 and the embedded steel plate 8.

More specifically, the double acting jack 12 is bolted to the steel corbel 9 between the upper and lower open caisson sections 2, 3.

More specifically, the V-shaped rubber water seal 10 includes an upper V-shaped rubber water seal 100 and a lower V-shaped rubber water seal 101, the upper V-shaped rubber water seal 100 is adhered to the inner wall of the steel plate ring 7 by bonding glue, and the lower V-shaped rubber water seal 101 is adhered to the outer wall of the lower end of the upper sinking segment 2 by bonding glue.

More specifically, the height of the steel plate ring 7 is about 1000 mm.

The invention adopts the structure arrangement, according to the characteristics of large pressure at the lower part and small pressure at the upper part of the open caisson 1, the open caisson 1 is designed into two open caisson sections of an upper open caisson section 2 and a lower open caisson section 3, the length of the lower open caisson section 3 accounts for 2/5 of the total length, the open caisson 1 can basically sink the upper open caisson section 2 to a certain depth below a mud surface under the action of self weight, at the moment, the force can be transmitted to the lower open caisson section 3 through a double-acting jack 12 by virtue of the frictional resistance of the upper open caisson section 2 and soil and the self weight, so that the lower open caisson section 3 sinks, after the lower open caisson section 3 sinks to a certain depth, the upper open caisson section 2 is pulled to sink by virtue of the gravity and the frictional resistance of the lower open caisson section 3 by a double-acting jack 12, and the sinking of the upper open caisson section 2 and the lower open caisson section 3 is assisted by the double-acting jack 12, so that the sinking of the open caisson 1 is in a controllable state, thereby avoiding the sudden sinking and constructing the open field, the deflection of the open caisson can be corrected by means of the single-side jacking force.

The open caisson 1 is sunk by adopting the process, so that the defects of difficult sinking and massive ballast construction of the open caisson 1 can be avoided, the construction controllability is greatly improved, and the open caisson has a wider application prospect;

the invention is mainly suitable for the construction of the round open caisson 1.

A method of sinking an elongate caisson structure, comprising the steps of:

the method comprises the following steps: preparing according to the construction steps of the open caisson 1, prefabricating a lower section of the open caisson section 3, sinking the lower section of the open caisson section 3 according to a conventional process after the strength of the lower section of the open caisson section 3 meets the requirement, stopping sinking after the lower section of the open caisson section 3 sinks to a certain depth, placing a partition material at the top of the lower section of the open caisson section 3 to prefabricate an upper section of the open caisson section 2, and burying an embedded part during prefabrication;

step two: after a template of the upper section of the sinking section 2 is removed, welding a steel plate ring 7 on embedded angle steel 6 at the upper part of the lower section of the sinking section 3, painting adhesive glue at the lower end of the outer part of the upper section of the sinking section 2 within about 100mm, pushing a lower V-shaped rubber water seal 101 into the lowest end of the upper section of the sinking section 2 from top to bottom along the outer wall of the upper section of the sinking section 2, bonding the lower V-shaped rubber water seal 101 on the outer wall of the upper section of the sinking section 2 by the adhesive glue, and bonding the upper V-shaped rubber water seal 100 on the upper part of the inner wall of the steel plate ring 7 by the same method;

step three: welding steel brackets 9 on pre-embedded steel plates 8 on the inner wall of the open caisson 1, connecting two ends of a double-acting jack 12 to two corresponding steel brackets 9 on the upper open caisson section 2 and the lower open caisson section 3 by bolts, and communicating the double-acting jack 12 with an oil pump by a pressure pipe;

step four: the open caisson 1 continues to sink by the dead weight under the excavation construction until the upper section open caisson section 2 enters the soil for a certain length, until the open caisson 1 cannot sink under the dead weight, an oil pump is started to supply oil to the double-acting jack 12, so that the double-acting jack 12 pushes the lower section open caisson section 3 to continue to sink under the excavation construction, the pushing is stopped when the open caisson sinks by about 800mm, the oil is reversely supplied, the double-acting jack 12 retracts, the upper section open caisson section 2 is pulled to sink by about 800mm, and the open caisson 1 is sunk to the designed elevation repeatedly;

step five: and welding the upper section of the open caisson section 2 and the lower section of the open caisson section 3 into a whole through embedded angle steel 6, removing the double-acting jack 12 and the steel bracket 9 in the open caisson, and constructing the rest open caisson 1.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and those skilled in the art can make various modifications without departing from the spirit and scope of the present invention.