Underwater separate bin pouring method for vertical shaft bottom sealing

Abstract

The invention discloses a vertical shaft bottom sealing underwater separated bin pouring method which comprises the following steps that S1, core bin steel is lifted to the middle position of the bottom of a vertical shaft, then corner bin steel is lifted to the edge position of the bottom of the vertical shaft, and the corner bin steel is inserted into locking corners of the core bin steel to form steel lattices; wherein a core silo is formed in the middle of the core silo steel, corner silos are formed between the corner silo steel and the inner wall of the vertical shaft, and side silos are formed among the corner silo steel, the core silo steel and the inner wall of the vertical shaft; s2, concrete is poured into the core bins to the top faces of the steel grids, and then concrete is poured into the corner bins and the side bins to the top faces of the steel grids; and S3, the bottom ring beam is lifted to the position above the steel lattice, concrete is poured to the designed height of the top face of the sealing bottom, and pouring of the sealing bottom is completed. The method has the advantages that the core bin is firstly adopted, then the corner bins and the side bins are symmetrically poured, and finally the bottom sealing top surface concrete is poured, so that the complete vertical shaft bottom sealing can be formed step by step, and the anti-permeability capacity of the vertical shaft bottom sealing is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of vertical shaft construction, and particularly relates to an underwater compartment casting method for vertical shaft bottom sealing. Background Art

[0002] At present, there is a great demand for shaft construction. In the prior art, shaft construction methods are divided into manual excavation construction, semi-mechanical excavation construction and mechanical excavation construction. However, manual excavation construction and semi-mechanical excavation construction have a long period of time, and workers are required to work underground. It is difficult to ensure the personal safety of workers during the construction process. In mechanical excavation, drilling rigs or shaft boring machines are usually used for excavation: for strata with good ground stability, dry construction is usually used, and the underground bottom sealing is relatively simple; for strata with poor ground stability, submersible shaft boring machines are usually used for construction. During the construction process, the submersible shaft boring machine needs to dive underwater as a whole for construction, and the bottom sealing work needs to be carried out underwater.

[0003] For existing underground bottom sealing technology, the bottom is usually sealed by directly pouring concrete, but this method of bottom sealing easily leads to reduced density of the bottom sealing concrete block and poor anti-floating and anti-shearing capabilities. In the face of unfavorable geological conditions, the bottom sealing concrete can be reinforced by lowering the steel cage structure to ensure the stability and reliability of the bottom sealing structure; however, the method of using the steel cage structure for bottom sealing has the defects of heavy weight, easy deformation and difficulty in positioning during overall hoisting. In addition, due to the existence of the annular beam set up for the suspension of vertical excavation equipment and the reinforcement of the blade foot area stiffness, the steel cage structure is large in size and difficult to hoist and place the bottom. At the same time, since the steel bars in the steel cage structure are arranged relatively closely, the spacing between the steel bars is small, so there are problems such as difficulty in underwater vibration, reduced concrete density and difficulty in ensuring the quality of the bottom sealing.

[0004] To sum up, there is an urgent need for an underwater compartment casting method for the bottom of a shaft to improve the compactness and integrity of the bottom concrete, prevent water leakage from the bottom, and enhance the strength and anti-floating and anti-shear capabilities of the bottom of the shaft to solve the problems existing in the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a method for underwater compartment casting of a shaft bottom seal in accordance with the above-mentioned deficiencies of the prior art, and to use a steel grid for compartment casting, the steel grid being composed of a core bin steel and a corner bin steel, the core bin steel being a well-shaped structure, and the four corners of the core bin steel being provided with right-angled locking angles, the corner bin steel being a right-angled structure and being provided with four, and the right-angled parts of the four corner bin steels being respectively installed on the four locking angles of the core bin steel. Underwater compartment casting of large-volume concrete for the shaft bottom seal can ensure the integrity of the concrete. Compartment casting can also ensure the compactness of the bottom seal concrete, eliminate the holes generated by underwater concrete casting, and prevent water leakage. By first casting the core bin, then symmetrically casting the corner bins and side bins, and finally casting the concrete on the top surface of the bottom seal, a complete shaft bottom seal can be formed in steps, and the anti-seepage capacity of the shaft bottom seal can be improved.

[0006] The purpose of the present invention is achieved by the following technical solutions: A method for underwater compartment casting of a vertical shaft bottom, the method comprising the following steps: S1: hoist the core warehouse steel to the middle position of the bottom of the shaft, then hoist the corner warehouse steel to the edge position of the bottom of the shaft, and insert the corner warehouse steel into the locking angle of the core warehouse steel to form a steel grid; The core bin steel is a tic-tac-toe structure, and right-angled locking angles are arranged at the four corners of the core bin steel. The corner bin steel is a right-angled structure and is provided with four of them. The right-angled parts of the four corner bin steels are respectively installed on the four locking angles of the core bin steel. Both ends of the corner bin steel are in contact with the inner wall of the shaft. The middle part of the core bin steel forms a core bin, and a corner bin is formed between the corner bin steel and the inner wall of the shaft. A side bin is formed between the corner bin steel, the core bin steel and the inner wall of the shaft. S2: pouring concrete in the core bin to the top surface of the steel lattice, and then pouring concrete in the corner bin and the side bin to the top surface of the steel lattice; S3: Lift the bottom ring beam to above the steel grid, pour concrete to the designed height of the bottom cover top surface, and complete the pouring of the bottom cover.

[0007] In step S2, concrete is poured in the corner bin and the side bin in a symmetrical pouring manner. Symmetric pouring herein refers to pouring concrete in two symmetrical corner bins / side bins at the same time.

[0008] The height of the core warehouse steel is greater than that of the corner warehouse steel, and the top surface of the core warehouse steel is flush with the top surface of the corner warehouse steel, and the bottom surface of the core warehouse steel is located below the bottom surface of the corner warehouse steel.

[0009] The core bin steel includes a core bin side plate and a corner locking limb plate. The core bin side plates are provided with four and enclose a U-shaped structure. Each of the two ends of the core bin side plates is provided with a corner locking limb plate. The two corner locking limb plates at each corner position of the U-shaped structure form the locking angle.

[0010] The corner warehouse steel is composed of two mutually perpendicular corner warehouse limb plates.

[0011] The bottom ring beam comprises a circular ring and a support rod, wherein two support rods are provided, the two support rods are cross-arranged and form an X shape, and both ends of the support rods are connected to the inner wall of the circular ring.

[0012] The advantages of the present invention are: (1) Due to the presence of the ring beam for suspending the vertical tunneling equipment and enhancing the stiffness of the blade foot area, the modular steel grid is more conducive to underwater assembly under restricted conditions and can be prefabricated in advance; (2) Underwater sub-chamber pouring of large volume concrete for the bottom of the shaft can ensure the integrity of the concrete; (3) Separate pouring can also ensure the compactness of the bottom concrete, eliminate the holes caused by underwater concrete pouring, and prevent water leakage; (4) By first pouring the core bin, then symmetrically pouring the corner bin and side bin, and finally pouring the concrete on the top surface of the bottom seal, a complete vertical shaft bottom seal can be formed in steps, thereby improving the anti-seepage capacity of the vertical shaft bottom seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic flow chart of the steps of the underwater compartment casting method for the bottom sealing of a vertical shaft according to the present invention; Figure 2 It is a structural schematic diagram of the steel grid of the present invention; Figure 3 This is a schematic diagram of the installation of the steel grid in the shaft of the present invention; Figure 4 for Figure 3 Middle AA section; Figure 5 for Figure 3 Middle BB section; Figure 6 This is a schematic diagram of the bottom sealing of the shaft after the compartment casting of the present invention; Figure 7 for Figure 6 Middle CC section; Figure 8 for Figure 6 Middle DD section; like Figures 1 to 8 As shown, the marks in the figure represent respectively: 1. Steel grid, 2. Vertical shaft, 3. Water-rich formation, 4. Formation water; 11. Core warehouse steel, 12. Corner warehouse steel; 111. Core warehouse side plate, 112. Angle locking, 113. Angle locking limb plate, 114. Core warehouse; 121. Corner warehouse limb board, 122. Corner warehouse, 123. Side warehouse; 21. Inner wall of shaft, 22. Bottom ring beam, 23. Bottom cover; 231. Core warehouse concrete, 232. Corner warehouse concrete, 233. Side warehouse concrete, 234. Bottom cover top concrete. DETAILED DESCRIPTION

[0014] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art: Example: Figures 1 to 8 As shown, this embodiment specifically relates to a method for underwater compartment casting of a shaft bottom, which mainly includes the following steps: S1: Figures 2 to 8 As shown, the core warehouse steel 11 is hoisted to the middle position of the bottom of the shaft 2, and then the corner warehouse steel 12 is hoisted to the edge position of the bottom of the shaft 2, and the corner warehouse steel 12 is inserted into the locking angle 112 of the core warehouse steel 11 to form the steel grid 1.

[0015] The vertical shaft 2 is arranged in a water-rich stratum 3, and there is formation water 4 in the vertical shaft 2. The height of the core warehouse steel 11 is greater than the height of the corner warehouse steel 12, and the top surface of the core warehouse steel 11 is flush with the top surface of the corner warehouse steel 12, and the bottom surface of the core warehouse steel 11 is located below the bottom surface of the corner warehouse steel 12. The core warehouse steel 11 is a well-shaped structure, and right-angled locking angles 112 are arranged at the four corners of the core warehouse steel 11. The corner warehouse steel 12 is a right-angled structure and is provided with four, and the right-angled parts of the four corner warehouse steels 12 are respectively installed on the four locking angles 112 of the core warehouse steel 11, and both ends of the corner warehouse steel 12 are in contact with the inner wall 21 of the vertical shaft.

[0016] The core bin steel 11 includes a core bin side plate 111 and a locking angle limb plate 113. The core bin side plate 111 is provided with four and encloses a U-shaped structure. Each core bin side plate 111 is provided with a locking angle limb plate 113 at both ends. The two locking angle limb plates 113 at each corner position of the U-shaped structure form a locking angle 112. The corner bin steel 12 is composed of two mutually perpendicular corner bin limb plates 121. The middle part (U-shaped structure) of the core bin steel 11 forms a core bin 114, and the core bin 114 is used to cast the core bin concrete 231. A corner bin 122 is formed between the corner bin steel 12 and the inner wall 21 of the shaft. The corner bin 122 is used to cast the corner bin concrete 232. A side bin 123 is formed between the corner bin steel 12, the core bin steel 11 and the inner wall 21 of the shaft. The side bin 123 is used to cast the side bin concrete 233.

[0017] S2: Figures 2 to 8As shown, concrete is poured in the core bin 114 to the top surface of the steel lattice 1 to form core bin concrete 231, and then concrete is poured in the corner bin 122 and the side bin 123 to the top surface of the steel lattice 1 to form corner bin concrete 232 and side bin concrete 233, respectively.

[0018] The concrete is poured in the corner bin 122 and the side bin 123 in a symmetrical pouring manner. The symmetrical pouring herein refers to pouring concrete in two symmetrical corner bins 122 / side bins 123 at the same time.

[0019] S3: Figures 2 to 8 As shown, the bottom ring beam 22 is hoisted to above the steel grid 1, and concrete (bottom cover top surface concrete 234) is poured to the designed height of the bottom cover top surface to complete the pouring of the bottom cover 23.

[0020] Among them, the bottom ring beam 22 is wrapped by the bottom top surface concrete 234. The bottom ring beam 22 includes a circular ring and a support rod. The outer diameter of the circular ring is equal to the inner diameter of the shaft 2. Two support rods are provided, and the two support rods are cross-arranged and X-shaped. Both ends of the support rods are connected to the inner wall of the circular ring.

[0021] The beneficial effects of this embodiment are: (1) Due to the presence of the ring beam for suspending the vertical tunneling equipment and enhancing the stiffness of the blade foot area, the modular steel grid is more conducive to underwater assembly under restricted conditions and can be prefabricated in advance; (2) Underwater sub-chamber pouring of large volume concrete for the bottom of the shaft can ensure the integrity of the concrete; (3) Separate pouring can also ensure the compactness of the bottom concrete, eliminate the holes caused by underwater concrete pouring, and prevent water leakage; (4) By first pouring the core bin, then symmetrically pouring the corner bin and side bin, and finally pouring the concrete on the top surface of the bottom seal, a complete vertical shaft bottom seal can be formed in steps, thereby improving the anti-seepage capacity of the vertical shaft bottom seal.

[0022] Although the above embodiments have described in detail the concepts and embodiments of the present invention with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and changes can still be made to the present invention without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A method for casting underwater compartments for bottom sealing of a vertical shaft, characterized in that The method comprises the following steps: S1: hoist the core warehouse steel to the middle position of the bottom of the shaft, then hoist the corner warehouse steel to the edge position of the bottom of the shaft, and insert the corner warehouse steel into the locking angle of the core warehouse steel to form a steel grid; The core bin steel is a tic-tac-toe structure, and right-angled locking angles are arranged at the four corners of the core bin steel. The corner bin steel is a right-angled structure and is provided with four of them. The right-angled parts of the four corner bin steels are respectively installed on the four locking angles of the core bin steel. Both ends of the corner bin steel are in contact with the inner wall of the shaft. The middle part of the core bin steel forms a core bin, and a corner bin is formed between the corner bin steel and the inner wall of the shaft. A side bin is formed between the corner bin steel, the core bin steel and the inner wall of the shaft. S2: pouring concrete in the core bin to the top surface of the steel lattice, and then pouring concrete in the corner bin and the side bin to the top surface of the steel lattice; S3: Lift the bottom ring beam to above the steel grid, pour concrete to the designed height of the bottom cover top surface, and complete the pouring of the bottom cover.

2. The method for underwater sub-compartment casting of a vertical shaft bottom seal according to claim 1 is characterized in that In step S2, concrete is poured in the corner bin and the side bin in a symmetrical pouring manner. Symmetric pouring herein refers to pouring concrete in two symmetrical corner bins / side bins at the same time.

3. The method for underwater sub-compartment casting of a vertical shaft bottom seal according to claim 1 is characterized in that The height of the core warehouse steel is greater than that of the corner warehouse steel, and the top surface of the core warehouse steel is flush with the top surface of the corner warehouse steel, and the bottom surface of the core warehouse steel is located below the bottom surface of the corner warehouse steel.

4. The method for underwater sub-compartment casting of a vertical shaft bottom seal according to claim 1 is characterized in that The core bin steel includes a core bin side plate and a corner locking limb plate. The core bin side plates are provided with four and enclose a U-shaped structure. Each of the two ends of the core bin side plates is provided with a corner locking limb plate. The two corner locking limb plates at each corner position of the U-shaped structure form the locking angle.

5. The method for underwater sub-compartment casting of a vertical shaft bottom seal according to claim 1, characterized in that The corner warehouse steel is composed of two mutually perpendicular corner warehouse limb plates.

6. The method for underwater sub-compartment casting of a vertical shaft bottom seal according to claim 1, characterized in that The bottom ring beam comprises a circular ring and a support rod, wherein two support rods are provided, the two support rods are cross-arranged and form an X shape, and both ends of the support rods are connected to the inner wall of the circular ring.

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