CN217556985U

CN217556985U - Prefabricated bottom compartment structure in open caisson

Info

Publication number: CN217556985U
Application number: CN202221202397.9U
Authority: CN
Inventors: 黄昌富; 曹振杰; 邢如祥; 罗志敏
Original assignee: China Railway 15th Bureau Group Co Ltd
Current assignee: China Railway 15th Bureau Group Shanghai Intelligent Transportation Technology Co ltd; China Railway 15th Bureau Group Co Ltd
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-10-11
Anticipated expiration: 2032-05-19

Abstract

The utility model discloses a prefabricated end compartment structure in open caisson, including end compartment, bottom compartment locates the bottom in the open caisson, end compartment is cross or groined type, be equipped with the cavity on the end compartment, end compartment with the open caisson bottom encloses jointly and closes in order to separate the back cover space for a plurality of, through in the cavity of end compartment self with each the concrete is pour in the filling of compartment space can form the back cover, end compartment side is equipped with shear key. The utility model has the advantages that: simple structure, effectively improves the tensile and bending resistance of the back cover.

Description

Prefabricated bottom compartment structure in open caisson

Technical Field

The utility model belongs to the technical field of the technique of open caisson construction and specifically relates to a prefabricated end compartment structure in open caisson.

Background

The large-volume open caisson foundation has the characteristics of large plane size, deep sinking depth and large bottom sealing square amount, and because the sinking depth is deep, a non-drainage sinking mode is usually adopted in the last sinking, the bottom sealing quality of the open caisson is difficult to control, the bottom sealing concrete square amount is large, the underwater concrete pouring construction organization is difficult, and the tensile and bending resistance of underwater plain concrete is poor.

There is therefore a need for a prefabricated bottom compartment structure in a caisson which solves the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a prefabricated end compartment structure in open caisson according to above-mentioned prior art not enough, bottom in the open caisson sets up end compartment, and end compartment and open caisson bottom enclose jointly and close in order to separate the back cover space for a plurality of, pack the pouring concrete in the cavity of end compartment self earlier, later pack the pouring concrete in each divided back cover space in proper order to form the back cover, improved the tensile, the bending resistance of back cover effectively.

The utility model discloses the purpose is realized accomplishing by following technical scheme:

the utility model provides a prefabricated end compartment structure in open caisson which characterized in that: including the end compartment, the bottom in the sinking well is located to the end compartment, the end compartment is cross or groined type, be equipped with the cavity in the end compartment, the end compartment with the sinking well bottom encloses jointly and closes in order to be a plurality of with back cover space partition, with each divided in the cavity of end compartment self all fill in the back cover space and pour the concrete in order to form the back cover.

And guide grooves with the number, the position, the shape and the size corresponding to those of the outer end parts of the bottom compartment are formed in the inner wall of the bottom of the open caisson along the circumferential direction of the inner wall.

The guide groove is internally provided with a bulge, and the outer end part of the bottom compartment is provided with a groove matched with the bulge.

And a rotating groove is arranged below the guide groove and communicated with the lower end of the guide groove.

The number of the rotary grooves corresponds to the number of the outer end parts of the bottom compartment, a plurality of tooth openings are arranged between the rotary grooves along the vertical direction, and the tooth openings are communicated with the side parts of the rotary grooves.

The bottom of the bottom compartment is provided with a pointed end.

And shear keys are arranged on the side surfaces of the bottom compartments.

The utility model has the advantages that:

(1) The structure is simple, and the tensile and bending resistance of the back cover is effectively improved;

(2) In order to ensure the stability of the foundation pit, the open caisson in the soft soil area needs to adopt a non-drainage excavation mode, the reinforced concrete bottom compartment divides the bottom sealing concrete into a plurality of parts under water, and single-compartment pouring is carried out, so that the single-time pouring volume of the concrete is reduced, and the pouring quality of the bottom sealing concrete is favorably improved;

(3) The bottom compartment is provided with a shear key, so that the bottom compartment can be more firmly connected with bottom sealing plain concrete;

(4) The open caisson bottom section is provided with the tooth openings, the connection condition of the back cover and the open caisson is closer to consolidation, and the bending moment coefficient of the round back cover concrete can be reduced;

(5) The bottom compartment is a steel structure, has strong tensile and bending resistance, and can be used for bending resistance together with the bottom sealing concrete, thereby obviously improving the bending resistance, reducing the thickness of the bottom sealing concrete and reducing the construction difficulty.

Drawings

FIG. 1 is a longitudinal section view of the open caisson of the present invention;

fig. 2 is a cross-sectional view of the open caisson of the present invention;

FIG. 3 is a longitudinal sectional view of the open caisson in step S1 of the construction method of the present invention;

FIG. 4 is a cross sectional view of the open caisson in step S1 of the construction method of the present invention;

FIG. 5 is a longitudinal sectional view of the open caisson in step S2 of the construction method of the present invention;

FIG. 6 is a cross sectional view of the open caisson in step S2 of the construction method of the present invention;

FIG. 7 is a longitudinal sectional view of the open caisson in step S3 of the construction method of the present invention;

fig. 8 is a cross sectional view of the open caisson in step S3 of the construction method of the present invention;

fig. 9 is a longitudinal sectional view of the open caisson in step S4 of the construction method of the present invention;

fig. 10 is a cross-sectional view of the open caisson in step S4 of the construction method of the present invention;

fig. 11 is a longitudinal sectional view of the open caisson in step S5 of the construction method of the present invention;

fig. 12 is a cross sectional view of the open caisson in step S5 of the construction method of the present invention;

fig. 13 is a longitudinal sectional view of the open caisson in step S6 of the construction method of the present invention;

fig. 14 is a cross-sectional view of the open caisson in step S6 of the construction method of the present invention;

fig. 15 is a layout view of the guide groove, the rotary groove and the tooth gap of the present invention.

Detailed Description

The features of the present invention and other related features are described in further detail below by way of example in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:

as shown in fig. 1-15, the marks 1-14 are respectively indicated as ground line 1, water level 2, open caisson 3, back cover 4, bottom compartment 5, tunneling equipment 6, bearing platform 7, guide groove 8, shear key 9, protrusion 10, groove 11, tooth mouth 12, tip 13 and rotary groove 14.

Example (b): as shown in fig. 1 and fig. 2, the present embodiment relates to a prefabricated bottom compartment structure in an open caisson, which mainly includes a bottom compartment 5, and the bottom compartment 5 is disposed at the bottom of the open caisson 3. The open caisson 3 is arranged inside the bearing platform 7, the bearing platform 7 is arranged on the ground line 1, water is contained in the open caisson 3, and the bottom compartment 5 is positioned below the water level 2. The bottom compartment 5 is cross or groined type, and in this embodiment, bottom compartment 5 is the cross to its bottom is convex, in order to satisfy the requirement that forms circular back cover, is equipped with the cavity in the bottom compartment 5, and only open-top is in the bottom compartment 5 promptly, and other places seal, through from bottom compartment 5 top toward this cavity intussuseption of filling concrete, can form reinforced concrete structure. The bottom compartment 5 and the bottom of the open caisson 3 jointly enclose to divide the back cover space into a plurality of small back cover spaces (four in this embodiment), and the cavity of the bottom compartment 5 is filled with cast concrete first, and then the separated back cover spaces are filled with cast concrete in sequence to form the back covers 4. In order to ensure the stability of the foundation pit, the open caisson in the soft soil area needs to adopt a non-drainage excavation mode, the bottom sealing concrete is divided into a plurality of parts by the reinforced concrete bottom compartment under water, and single-compartment pouring is carried out, so that the single-time pouring volume of the concrete is reduced, and the pouring quality of the bottom sealing concrete is favorably improved. The side surface of the bottom compartment 5 is provided with a shear key 9 which can be more firmly connected with the bottom sealing plain concrete.

As shown in fig. 1 and 2, the inner wall of the bottom of the open caisson 3 is provided with guide grooves 8 (four in the embodiment) corresponding to the number, position, shape and size of the outer end portions of the bottom compartments 5 in the circumferential direction, and the guide grooves 8 move downward along the guide grooves 8 through the outer end portions of the bottom compartments 5 to realize the downward placement of the bottom compartments 5, and in addition, guide wheels (not shown) are installed at the end portions of the bottom compartments 5 to facilitate the smooth downward placement of the bottom compartments 5. Be equipped with arch 10 in the guide way 8, end compartment 5 outer tip is seted up with arch 10 matched with recess 11, and the cooperation of arch 10 and recess 11 for accurate location between end compartment 5 and guide way 8. In addition, the bottom of the bottom compartment 5 is provided with a pointed head 13, and the pointed head 13 can be penetrated into a soft soil body below the bottom of the open caisson 3 under the action of self gravity.

As shown in fig. 1, 2 and 15, a rotary groove 14 is provided below the guide groove 8, the rotary groove 14 communicates with the lower end of the guide groove 8, and the size of the rotary groove 14 is larger than that of the guide groove 8. When the bottom compartment 5 is put down in place, the bottom compartment 5 is rotated by the hanging system, so that the bottom compartment 5 is staggered with the guide groove 8, namely when the outer end part of the bottom compartment 5 completely enters the rotating groove 14, the bottom compartment 5 is rotated by the hanging system, so that the outer end part of the bottom compartment 5 is far away from the guide groove 8, and the bottom compartment is fixed at the bottom of the open caisson 3. In this embodiment, the number of the rotary grooves 14 (four in this embodiment) corresponds to the number of the outer end portions of the bottom compartments 5, the rotary grooves 14 are arranged along the circumferential direction of the inner wall of the bottom of the open caisson 3, a plurality of tooth openings 12 (two in this embodiment) are arranged between two adjacent rotary grooves 14 and arranged along the vertical direction, the tooth openings 12 are arranged along the circumferential direction of the inner wall of the bottom of the open caisson 3, the tooth openings 12 are communicated with the side portions of the rotary grooves 14, the tooth openings 12 enable the connection condition of the bottom seal 4 and the open caisson 3 to be closer to consolidation, and the bending moment coefficient of circular bottom seal concrete can be reduced. In addition, the side surface of the bottom compartment 5 is provided with a shear key 9 which can be more firmly connected with the bottom sealing plain concrete.

In the embodiment, the bottom compartment is of a steel structure and has strong tensile and bending resistance, the bottom compartment and the bottom sealing concrete jointly participate in bending resistance, the bending resistance can be obviously improved, the thickness of the bottom sealing concrete is reduced, the construction difficulty is reduced, and the bottom sealing thickness of the bottom compartment can be reduced by one third compared with that of a bottomless compartment under the same condition.

As shown in fig. 3 to 15, the present embodiment also has the following construction method:

s1: as shown in fig. 3 and 4, a tunneling device 6 is placed in the open caisson 3, and the tunneling device 6 tunnels downwards along the bottom of the open caisson 3 to a designed elevation; it should be noted that other underwater earth taking methods or devices can also be adopted for the heading device 6.

S2: as shown in fig. 5 and 6, the cutterhead of the excavating equipment 6 is contracted, the excavating equipment 6 is lifted, and the open caisson 3 is suspended by a suspension system and then is continuously sunk to the excavating bottom elevation.

S3: as shown in fig. 7 and 8, the bottom compartment 5 is lowered by using the hanging system, the outer end part of the bottom compartment 5 moves downwards along the guide groove 8, and the tip 1 can penetrate into the soft soil body below the bottom of the open caisson 3 under the action of self gravity.

S4: as shown in fig. 9, 10 and 15, when the bottom compartment 5 is lowered to the proper position, the bottom compartment 5 is rotated by the hanging system to make the bottom compartment 5 staggered with the guide groove 8, that is, when the outer end of the bottom compartment 5 completely enters the rotating groove 14, the bottom compartment 5 is rotated by the hanging system to make the outer end of the bottom compartment 5 far away from the guide groove 8, so that the bottom compartment is fixed at the bottom of the open caisson 3.

S5: as shown in fig. 11 and 12, the bottom compartment 5 and the bottom of the open caisson 3 jointly enclose to divide the bottom sealing space into a plurality of spaces, the cavity of the bottom compartment 5 is filled with cast concrete, and then the divided bottom sealing spaces are filled with cast concrete in sequence to form the bottom sealing 4.

S6: as shown in fig. 13 and 14, after the back cover 4 reaches the designed strength, the hanging system is removed, and the water in the open caisson 3 is extracted, thereby completing the open caisson construction.

In conclusion, in the embodiment, the open caisson is not drained, tunneled and excavated, the bottom compartment needs to be installed after the tunneling equipment is dismantled due to the existence of the tunneling equipment, and the open caisson, the bottom compartment and the bottom sealing concrete are connected through targeted measures, so that the open caisson is innovative.

Although the conception and the embodiments of the present invention have been described in detail with reference to the drawings, those skilled in the art will recognize that various changes and modifications can be made therein without departing from the scope of the appended claims, and therefore, the description thereof is not repeated herein.

Claims

1. The utility model provides a prefabricated end compartment structure in open caisson which characterized in that: including end compartment, the bottom in the caisson is located to end compartment, end compartment is cross or groined type, be equipped with the cavity in the end compartment, end compartment with the caisson bottom encloses jointly and closes in order to be a plurality of with back cover space separation, in the cavity of end compartment self with each divided all fill in the back cover space and pour the concrete in order to form the back cover.

2. A prefabricated bottom compartment structure in an open caisson according to claim 1, wherein: and guide grooves with the number, the position, the shape and the size corresponding to those of the outer end parts of the bottom compartment are formed in the inner wall of the bottom of the open caisson along the circumferential direction of the inner wall.

3. A prefabricated bottom compartment structure in an open caisson according to claim 2, wherein: the guide groove is internally provided with a bulge, and the outer end part of the bottom compartment is provided with a groove matched with the bulge.

4. The prefabricated bottom compartment structure in the open caisson according to claim 2, wherein: and a rotating groove is arranged below the guide groove and communicated with the lower end of the guide groove.

5. The prefabricated bottom compartment structure in the open caisson according to claim 4, wherein: the number of the rotary grooves corresponds to the number of the outer end parts of the bottom compartment, a plurality of tooth openings are arranged between the rotary grooves along the vertical direction, and the tooth openings are communicated with the side parts of the rotary grooves.

6. A prefabricated bottom compartment structure in an open caisson according to claim 1, wherein: the bottom of the bottom compartment is provided with a pointed end.

7. A prefabricated bottom compartment structure in an open caisson according to claim 1, wherein: and shear keys are arranged on the side surfaces of the bottom compartments.