Continuous open caisson type construction structure of underground storage pond and construction method of underground storage pond

Abstract

The invention discloses a continuous open caisson type construction structure of an underground storage pond. The underground storage pond comprises more than three columnar units which are connected in sequence in the length direction of the cross section; the sizes of the columnar structures corresponding to every two adjacent columnar units in the width direction of the cross section are different; all the columnar units are of an independent open caisson structure during construction and sink in a jumping mode in the length direction of the cross section of the columnar structure; a gap of 2000mm + / -10% is formed between every two adjacent independent open caisson structures; and well wall connecting sections are poured at the positions, corresponding to the side walls of the columnar structures, of the two ends of each gap after sinking of all the columnar units is completed. The characteristics that the well body structure of the open caisson is large in rigidity, underwater bottom sealing of underground water is not needed and the like are fully utilized, the civil engineering amount of foundation pit supporting and a pool body main body structure of a traditional underground storage pond can be reduced, and a large number of potential safety hazards caused by deep and large foundation pit engineering of the traditional underground storage pond can be changed.

Description

Technical Field

[0001] The present invention relates to the technical field of underground storage tank construction, and particularly to a continuous caisson construction structure for an underground storage tank and a construction method for an underground storage tank. Background Art

[0002] With the frequent occurrence of extreme rainy season climates and the renovation requirements of urban rainwater systems, the construction field of underground rainwater storage tanks has shown intensive and vigorous development, with a wide range of applications.

[0003] In view of the following distinct characteristics of the underground storage tank: the excavation depth is relatively deep (generally reaching a depth of 20 meters below the ground surface), and within this depth range, the geological conditions of most cities are poor, the soil layer is soft, and the groundwater level is relatively abundant. The confined water has a great impact on the foundation pit within this depth range;

[0004] At the same time, the rapid development of the city has made the surrounding environment of the underground storage tank significantly complex.

[0005] The construction of underground storage tanks in urban built-up areas often presents phenomena such as complex and sensitive environmental conditions, high costs for foundation pit support measures, and even the inability to carry out on-site construction of large equipment, resulting in significant economic waste and environmental impact.

[0006] Therefore, how to overcome the defects of foundation pit support in the construction of underground storage tanks and reduce the adverse impact of the existing technology on the surrounding environment during the construction of underground storage tanks has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0007] In view of the above-mentioned defects of the existing technology, the present invention provides a continuous caisson construction structure for an underground storage tank and a construction method for an underground storage tank, aiming to overcome the defects of foundation pit support in the construction of underground storage tanks and reduce the adverse impact of the existing technology on the surrounding environment during the construction of underground storage tanks.

[0008] To achieve the above object, the present invention discloses a continuous caisson construction structure for an underground storage tank, and the outer shape of the underground storage tank is a columnar structure extending in the vertical direction;

[0009] The columnar structure includes three or more columnar units connected in sequence in the length direction of the cross-section;

[0010] The cross-section of each columnar unit is a rectangle;

[0011] During the construction of all columnar units, they are all independent caisson structures and sink in a jumping manner along the length direction of the cross-section of the columnar structure;

[0012] The so-called jumping sinking means that all the columnar units are sequentially numbered along the length direction of the cross-section of the columnar structure, and then all the independent caisson structures corresponding to the columnar units with odd numbers are sequentially sunk first, and then all the independent caisson structures corresponding to the columnar units with even numbers are sequentially sunk;

[0013] A gap of 2000mm ± 10% is provided between every two adjacent independent caisson structures;

[0014] At the positions corresponding to the side walls of the columnar structure at both ends of each gap, the well wall connection section is cast after all the columnar units are sunk.

[0015] Preferably, each independent caisson structure is precast on the ground.

[0016] Preferably, each independent caisson structure includes an independent horizontal force-bearing frame system structure during the caisson sinking stage, a caisson sinking force-providing system, a caisson sinking auxiliary system, and underwater concrete for sealing the bottom of the caisson.

[0017] Preferably, each independent caisson structure provides the required sinking force through corresponding bored cast-in-place piles and corresponding auxiliary sinking systems.

[0018] Preferably, the side walls corresponding to the well walls of the underground storage tank for each independent caisson structure are permanent well walls, and the rest are temporary well walls.

[0019] The present invention also provides a construction method for an underground storage tank, which is constructed by using the continuous caisson construction structure of the above-mentioned underground storage tank, and includes the following steps:

[0020] Step 1: Divide the underground storage tank to be constructed into a plurality of the columnar units according to the shape of the cross-section;

[0021] Step 2: Prefabricate the corresponding independent caisson structure for each columnar unit;

[0022] Step 3: Sequentially number all the columnar units along the length direction of the cross-section of the columnar structure of the underground storage tank, and then sequentially sink all the independent caisson structures corresponding to the columnar units with odd numbers first, and then sequentially sink all the independent caisson structures corresponding to the columnar units with even numbers to complete the sinking construction of all the independent caisson structures;

[0023] Step 4: Construct the well wall connection section at the side walls of the columnar structure corresponding to both ends of the gap between every two adjacent independent caisson structures;

[0024] Step 5: Demolish the temporary well walls of all the independent caisson structures that affect the operation function of the underground storage tank, so as to realize the connection and penetration of the originally independent independent caisson structures.

[0025] Preferably, in Step 4, the construction process of the well wall connection section on the side wall of the columnar structure corresponding to both ends of each gap is specifically as follows:

[0026] Pour each well wall connection section by means of excavation and in-situ casting through a pre-set water stop and soil retaining system.

[0027] Advantages of the present invention:

[0028] The present invention makes full use of the characteristics of the caisson well structure with relatively large stiffness and the underwater bottom sealing without the need to lower the groundwater level. It can not only reduce the civil engineering quantity of the foundation pit support + the main structure of the traditional underground storage tank, but also change the large number of potential safety hazards brought by the deep and large foundation pit project of the traditional underground storage tank. It can meet the different requirements of different functional areas of the underground storage tank for the plane size, and has strong practicability.

[0029] The following will further illustrate the concept, specific structure and technical effects of the present invention with reference to the drawings, so as to fully understand the purpose, features and effects of the present invention. Description of the Drawings

[0030] Figure 1 Shows the schematic plan structure diagram of an embodiment of the present invention.

[0031] Figure 2 Shows the schematic longitudinal sectional structure diagram of the independent caisson structure with the smallest width in an embodiment of the present invention.

[0032] Figure 3 Shows the schematic longitudinal sectional structure diagram of the independent caisson structure with a medium width in an embodiment of the present invention.

[0033] Figure 4 Shows the schematic longitudinal sectional structure diagram of the independent caisson structure with the largest width in an embodiment of the present invention. Detailed Embodiments

[0034] Embodiment

[0035] As Figures 1 to 4 shown, the continuous caisson construction structure of the underground storage tank, the outer shape of the underground storage tank 1 is a columnar structure extending in the vertical direction;

[0036] The columnar structure includes three or more columnar units connected in sequence in the length direction of the cross section;

[0037] The cross section of each columnar unit is a rectangle;

[0038] For every two adjacent columnar units, the corresponding columnar structure may have the same or different width dimensions in the cross-section as required;

[0039] During the construction of all columnar units, they are all independent caisson structures a, b, c, and they sink in a skipping manner along the length direction of the columnar structure in the cross-section;

[0040] The skipping sinking means that all columnar units are numbered in sequence along the length direction of the columnar structure in the cross-section, and then all the independent caisson structures a, b, c corresponding to the columnar units with odd numbers are sunk in sequence first, and then all the independent caisson structures a, b, c corresponding to the columnar units with even numbers are sunk in sequence;

[0041] A gap of 2000mm ± 10% is provided between every two adjacent independent caisson structures a, b, c;

[0042] At the positions of the side walls of the columnar structure corresponding to both ends of each gap, the shaft wall connection section is cast after all the columnar units have sunk.

[0043] In the present invention, the underground storage tank 1 is divided into multiple columnar structures, and the independent caisson structures a, b, c are respectively sunk for construction, so that each independent caisson structure a, b, c has the characteristic of a relatively large plane size. Through the provided sinking force system, the stress of the shaft wall during the sinking process can be greatly improved, and the thickness of the shaft wall structure can be reduced;

[0044] Moreover, the force system in the cutting edge area can also divide the large-sized underwater concrete sealing structure into several smaller-sized plane grids, greatly reducing the difficulty of underwater pouring of the underwater concrete sealing and ensuring the construction quality of the underwater concrete sealing.

[0045] In some embodiments, each independent caisson structure a, b, c is prefabricated on the ground.

[0046] In some embodiments, each independent caisson structure a, b, c includes an independent horizontal force frame system structure a3, b3, c3 during the caisson sinking stage, a caisson sinking force providing system, a caisson sinking auxiliary system, and caisson underwater concrete sealing.

[0047] In some embodiments, each independent caisson structure a, b, c provides the required sinking force through the corresponding bored cast-in-place piles a4, b4, c4 and the corresponding auxiliary sinking systems a5, b5, c5.

[0048] In practical applications, each independent caisson structure a, b, c provides the required sinking force according to the surrounding environmental conditions through methods such as bored cast-in-place piles and auxiliary sinking systems. It can not only achieve the sinking method of "sinking first and then excavating soil", but also the auxiliary sinking cast-in-place piles and the like can provide good isolation measures between the caisson and the surrounding environmental conditions, thereby reducing the weaknesses such as large ground collapse and large deformation of the surrounding environmental conditions commonly existing in the conventional sinking method, ensuring the safety of the surrounding environmental conditions, and greatly improving the applicable conditions of the continuous caisson type underground storage tank 1.

[0049] In some embodiments, the side walls of the side walls of each independent caisson structure a, b, c corresponding to the well wall of the underground storage tank 1 are permanent well walls a1, b1, c1, and the rest are temporary well walls a2, b2, c2.

[0050] The present invention also provides a construction method for an underground storage tank, which is constructed by using the continuous caisson type construction structure of the above-mentioned underground storage tank, and includes the following steps:

[0051] Step 1: Divide the underground storage tank 1 to be constructed into a plurality of columnar units according to the shape of the cross-section;

[0052] Step 2: Prefabricate the corresponding independent caisson structures a, b, c for each columnar unit;

[0053] Step 3: Number all the columnar units in sequence along the length direction of the cross-section of the columnar structure of the underground storage tank 1, and then first sink the independent caisson structures a, b, c corresponding to all the columnar units with odd numbers in sequence, and then sink the independent caisson structures a, b, c corresponding to all the columnar units with even numbers in sequence to complete the sinking construction of all the independent caisson structures a, b, c;

[0054] Step 4: Construct the well wall connection sections of the side walls of the columnar structures corresponding to both ends of the gap between every two adjacent independent caisson structures a, b, c;

[0055] Step 5: Demolish the temporary well walls a2, b2, c2 of all the independent caisson structures a, b, c that affect the operation function of the underground storage tank 1, so as to realize the connection and penetration of the originally independent caisson structures a, b, c.

[0056] In some embodiments, in Step 4, the construction process of the well wall connection sections of the side walls of the columnar structures corresponding to both ends of each gap is specifically as follows:

[0057] Pour each well wall connection section by means of excavation and in-situ casting through a pre-set water stop and soil retaining system.

[0058] In practical applications, due to the significant characteristics of underground storage tanks, which generally have a relatively deep burial depth and are located in urban built-up areas, the present invention makes full use of the characteristics of the large structural stiffness of the open caisson body and the underwater bottom sealing without the need for groundwater lowering. It can not only reduce the civil engineering quantity of the foundation pit support + the main body structure of the traditional underground storage tank, but also change the large number of potential safety hazards brought by the traditional deep and large foundation pit project of the underground storage tank, such as large foundation pit deformation, large-area ground collapse of the surrounding environmental conditions caused by groundwater lowering, settlement and cracking of buildings and pipelines. On the premise of reducing the project cost, it significantly improves the safety of the surrounding environmental conditions. At the same time, it can also be divided into adjacent open caissons that are independent of each other and have different plane sizes according to environmental conditions or functional requirements, and sink independently, which can meet the different requirements of different functional areas of the underground storage tank for plane sizes, and has strong practicability.

[0059] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. Continuous open caisson construction structure of underground storage tank; characterized in that The external shape of the underground storage tank (1) is a columnar structure extending in the vertical direction; The columnar structure includes more than three columnar units connected in sequence in the length direction of the cross-section; The cross-section of each columnar unit is rectangular; During construction, all the columnar units are independent caisson structures (a, b, c), and they sink in a skipping manner along the length direction of the cross-section of the columnar structure; The skipping sinking means that all the columnar units are numbered in sequence along the length direction of the cross-section of the columnar structure, and then the independent caisson structures (a, b, c) corresponding to all the columnar units with odd numbers are sunk in sequence first, and then the independent caisson structures (a, b, c) corresponding to all the columnar units with even numbers are sunk in sequence; A gap of 2000mm ± 10% is provided between every two adjacent independent caisson structures (a, b, c); At the positions of the side walls of the columnar structure corresponding to both ends of each gap, a well wall connection section is poured after all the columnar units have sunk; 2. The continuous caisson construction structure of the underground storage tank according to claim 1, characterized in that, Each independent caisson structure (a, b, c) is prefabricated on the ground; 3. The continuous open caisson type construction structure of the underground storage tank according to claim 1, characterized in that, Each independent caisson structure (a, b, c) includes an independent horizontal force-bearing frame system structure (a3, b3, c3) for the caisson sinking stage, a caisson sinking force providing system, a caisson sinking auxiliary system, and underwater blinding concrete for the caisson; 4. The continuous open caisson type construction structure of the underground storage tank according to claim 1, characterized in that Each independent caisson structure (a, b, c) provides the required sinking force through the corresponding bored cast-in-place piles (a4, b4, c4) and the corresponding auxiliary sinking systems (a5, b5, c5); 5. The continuous caisson construction structure of the underground storage tank according to claim 1, characterized in that The side walls corresponding to the well walls of the underground storage tank (1) of each independent caisson structure (a, b, c) are permanent well walls (a1, b1, c1), and the rest are temporary well walls (a2, b2, c2); 6. Construction method of underground storage tank, characterized in that, When constructing using the continuous caisson construction structure of the underground storage tank described in any one of claims 1 to 4, the following steps are included: Step 1: Divide the underground storage tank (1) to be constructed into multiple columnar units according to the shape of the cross-section; Step 2: Prefabricate the corresponding independent caisson structures (a, b, c) for each columnar unit; Step 3: Number all the columnar units in sequence along the length direction of the cross-section of the columnar structure of the underground storage tank (1), and then sink the independent caisson structures (a, b, c) corresponding to all the columnar units with odd numbers in sequence first, and then sink the independent caisson structures (a, b, c) corresponding to all the columnar units with even numbers in sequence to complete the sinking construction of all the independent caisson structures (a, b, c); Step 4: Construct the well wall connection sections at the side walls of the columnar structure corresponding to both ends of the gap between every two adjacent independent caisson structures (a, b, c); Step 5: Demolish the temporary well walls (a2, b2, c2) of all the independent caisson structures (a, b, c) that affect the operation function of the underground storage tank (1), so as to realize the connection and penetration of the originally independent independent caisson structures (a, b, c).

7. The construction method of the underground storage tank according to claim 7, characterized in that In Step 4, the construction process of the wellbore connection section of the side wall of the columnar structure corresponding to both ends of each of the gaps is specifically as follows: Each of the wellbore connection sections is cast by means of excavation and in-situ casting through a pre-set water stop and soil retaining system.

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