Self-weight-adjustable open caisson structure and construction method

Abstract

The invention discloses a self-weight-adjustable open caisson structure and a construction method, the open caisson structure comprises an open caisson body structure wall plate and longitudinal pipelines uniformly arranged in the open caisson body structure wall plate, and the longitudinal pipelines are filled with media with different weights to adjust the self weight of an open caisson body. The technical scheme of the invention has the following beneficial effects: 1, on the premise of not changing the sectional dimension of the open caisson structure, the purpose of adjusting the dead weight of the open caisson is achieved by filling air, water, concrete, metal bars and other media with different weights in the pipeline; 2, the problem of sudden sinking caused by overlarge self weight of the open caisson can be effectively prevented, and the application effect is better particularly in projects with uneven hardness and large soil layer property difference; 3, the problem that the open caisson cannot smoothly sink in a hard soil layer due to too small self weight can be effectively prevented; operation is easy, manufacturing cost is low, and application and popularization are facilitated.

Description

Technical Field

[0001] The invention belongs to the field of design and construction of reinforced concrete caissons, and in particular relates to a caisson structure with adjustable deadweight and a construction method. Background Art

[0002] Caisson is a well structure made on the ground, which is sunk to a certain depth underground by taking out the soil in the well and relying on the caisson's own weight. It is widely used in the field of underground structure engineering. The sinking stability and safety of the caisson are mainly based on two important parameters, namely the sinking coefficient and the sinking stability coefficient. The so-called sinking coefficient is the ratio of the deadweight of the well to the friction resistance of the well wall after the soil at the bottom of the well is taken out. Its value is the ratio of the deadweight of the well to the friction resistance of the well wall after deducting the buoyancy. It should generally be greater than 1.05 and less than 1.25. The so-called sinking stability coefficient is the ratio of the deadweight of the well to the friction resistance of the well wall and the ultimate bearing capacity of the foundation soil at the bottom of the caisson after deducting the buoyancy during the sinking process of the caisson. It should generally be less than 1.0. It can be seen from this that during the sinking process of the caisson, the deadweight of the caisson has a great influence on the safety and quality of the caisson construction.

[0003] During the sinking process of the caisson, when encountering a soft soil layer, it often sinks too fast or even suddenly sinks due to the failure to meet the requirements of sinking stability; when encountering a harder rock and soil layer, it often cannot sink smoothly due to excessive friction of the well wall. At present, in construction, soil reinforcement and other methods are often used to solve the problem of sudden sinking of the caisson. The problem of the caisson not being able to sink smoothly is often solved by increasing the structural size and deadweight of the caisson, adding counterweights, and lowering water. The above methods are usually costly and have a long construction period and are difficult to construct. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a caisson structure with adjustable deadweight and a construction method to solve the deficiencies in the prior art.

[0005] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0006] Provided is a caisson structure with adjustable deadweight, which comprises a caisson body structural wall plate and longitudinal pipes evenly arranged in the caisson body structural wall plate, wherein the longitudinal pipes are filled with media of different densities to adjust the deadweight of the caisson body.

[0007] As described in the caisson structure with adjustable deadweight, wherein the longitudinal pipe is located at the center position of the caisson body structure wall panel.

[0008] As for the caisson structure with adjustable deadweight, wherein the medium includes but is not limited to air, water, concrete, and metal rods.

[0009] In addition, a method for constructing a caisson structure with adjustable deadweight is provided, which is used to construct a caisson structure as described in any one of the above items, and includes:

[0010] S1. Analyze the deadweight of the caisson and soil conditions to determine the number of longitudinal pipes;

[0011] S2. When pouring the concrete of the inner and outer wall panels of the caisson, embed the longitudinal pipes in advance;

[0012] S3. During the caisson sinking construction, different media are selected to be filled into the longitudinal pipe according to the sinking speed and soil conditions to adjust the overall weight of the caisson.

[0013] The method for constructing a caisson structure with adjustable deadweight, further comprises: S4, after the caisson construction is completed, filling the longitudinal pipe with slightly expanded fine stone concrete.

[0014] The beneficial effects of the technical solution of the present invention are:

[0015] 1. The purpose of adjusting the deadweight of the caisson can be achieved by filling the pipe with media of different weights such as air, water, concrete, metal rods, etc. without changing the cross-sectional dimensions of the caisson structure;

[0016] 2. It can effectively prevent the sudden sinking of the caisson due to its excessive deadweight, especially in projects with uneven hardness and large differences in soil properties;

[0017] 3. It can effectively prevent the caisson from being unable to sink smoothly in the hard soil layer due to its small deadweight;

[0018] 4. Simple operation, low cost, suitable for promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To further illustrate the above-mentioned objectives, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Figure 1 A longitudinal cross-sectional view of a caisson according to a preferred embodiment of the present invention;

[0021] Figure 2 This is a plan view of a caisson in a preferred embodiment of the present invention;

[0022] In the figure: 1. Caisson main structure wall panel; 2. Longitudinal pipe; 3. Medium. DETAILED DESCRIPTION

[0023] The terms "invention", "present invention" and "the present invention" used in this specification are intended to refer broadly to all subject matter of this specification and any patent claims below. Statements containing these terms should not be understood to limit the subject matter described herein or to limit the meaning or scope of any patent claim below. In addition, this specification does not attempt to describe or limit the subject matter covered by any claim of any specific component, paragraph, statement or figure of this application. The subject matter should be understood with reference to the entire specification, all drawings and any claims below. The present invention may have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the words and terms used herein are for illustrative purposes and should not be considered as limiting.

[0024] The details of the present invention will now be discussed with reference to the accompanying drawings which illustrate the present invention by way of example only. In the accompanying drawings, similar features or components may be marked with the same reference numerals.

[0025] The use of "including," "having," and "comprising" and variations thereof herein is meant to encompass the items listed thereafter and their equivalents and additional items. Although reference may be made to directions such as above, below, upward, downward, rearward, bottom, top, front, rear, etc., in describing the drawings, for convenience, reference is made relative to the drawings. These directions are not intended to literally accept or limit the present invention in any form. In addition, terms such as "first," "second," "third," etc., are used herein for illustrative purposes and are not intended to indicate or imply importance or significance.

[0026] See also Figure 1 , Figure 2 As shown, in a preferred embodiment, the caisson structure with adjustable deadweight of the present invention includes a caisson body structural wall panel 1 and a longitudinal pipe 2 evenly arranged in the middle of the caisson body structural wall panel 1, and the longitudinal pipe 2 is filled with a medium 3 of different density to adjust the deadweight of the caisson body.

[0027] Furthermore, the longitudinal pipe 2 is located at the center of the caisson body structure wall 1. It is understandable that the number and spacing of the longitudinal pipes 2 should be determined comprehensively based on the deadweight of the caisson and the soil conditions. The longitudinal pipes 2 should be pre-buried in advance when the caisson wall concrete is poured.

[0028] The outer wall of the longitudinal pipe 2 is arranged with circumferential ribs and / or longitudinal ribs, which can effectively improve the strength and rigidity of the longitudinal pipe 2 and ensure the overall force-bearing performance of the caisson. At the same time, the longitudinal ribs can play a role in stopping water.

[0029] The medium 3 includes but is not limited to air (empty), water, concrete, metal rods, etc., to adjust the weight of the caisson, thereby controlling the sinking speed of the caisson and ensuring the safety of the caisson.

[0030] The construction of this caisson includes:

[0031] S1. Analyze the deadweight of the caisson and soil conditions to determine the number of longitudinal pipes 2;

[0032] S2. When pouring the concrete of the inner and outer wall panels of the caisson, embed the longitudinal pipe 2 in advance;

[0033] S3. During the sinking construction of the caisson, different media 3 are selected to be filled into the longitudinal pipe 2 according to the sinking speed and soil conditions to adjust the overall weight of the caisson.

[0034] Furthermore, the method also includes: S4, after the caisson construction is completed, filling the longitudinal pipe 2 with slightly expanded fine stone concrete to improve the redundancy of the permanent structure.

[0035] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A caisson structure with adjustable deadweight, characterized in that: The invention comprises a caisson body structural wall plate and longitudinal pipes evenly arranged in the caisson body structural wall plate, and the longitudinal pipes are filled with medium of different gravities to adjust the deadweight of the caisson body.

2. The caisson structure with adjustable deadweight as claimed in claim 1, characterized in that: The longitudinal pipe is located at the center of the caisson body structural wall panel.

3. The caisson structure with adjustable deadweight as claimed in claim 1, characterized in that: The medium includes but is not limited to air, water, concrete, and metal rods.

4. A method for constructing a caisson structure with adjustable deadweight, used for constructing a caisson structure as claimed in any one of claims 1 to 3, characterized in that: include: S1. Analyze the deadweight of the caisson and soil conditions to determine the number of longitudinal pipes; S2. When pouring the concrete of the inner and outer wall panels of the caisson, embed the longitudinal pipes in advance; S3. During the caisson sinking construction, different media are selected to be filled into the longitudinal pipe according to the sinking speed and soil conditions to adjust the overall weight of the caisson.

5. The method for constructing a caisson structure with adjustable deadweight as claimed in claim 4, characterized in that: Also includes: S4. After the caisson construction is completed, fill the longitudinal pipe with slightly expanding fine stone concrete.

Images