A reusable steel caisson

Abstract

The present application relates to a kind of reusable steel caisson, including standard section, column, loading assembly, standard section is divided into even standard sub-block, two sides of single standard sub-block have side column, are made of hollow cylinder, and the side column is opened even divided slot hole on one side;Rectangular reinforcing box is arranged on the inside, to exert downward pressure and press into caisson, or exert upward lifting force and pull up caisson;Any two standard sub-blocks are provided with column, and the both sides are opened through recess, for accommodating the two side columns of standard sub-block;Loading assembly is arranged on the outside of the column of standard sub-block, to exert press-in force or lifting force;The main body of loading assembly is double-acting single-piston rod oil cylinder, and the head of piston rod is provided with rotary mechanism;Rotary mechanism is arranged with movable top tooth on the outside.The steel caisson body structure of the present application can be recycled, can be reused, and cost is reduced;Cancel conventional upper compression beam, pressure control is more accurate, attitude control is more accurate, and the influence on the settlement of surrounding building components is smaller.

Description

TECHNICAL FIELD

[0001] The present application relates to a steel caisson in underground structure construction, in particular to a superimposed steel shell caisson, which is suitable for construction in soft soil. BACKGROUND

[0002] The caisson can be used as a retaining structure of underground structure. In the past, concrete structure was usually used to make the caisson sink by taking out soil in the caisson. Now, steel shell can be used to replace the original concrete caisson structure. The steel shell is pressed into the original soil, and then the soil in the steel shell is taken out. Then, concrete lining is poured on the inner wall of the steel shell to form a complete caisson structure. The steel shell is part of the caisson structure, and the cost is large. If the steel shell can be recycled, it is a way to reduce cost and increase benefit. SUMMARY

[0003] To solve the above technical problems, the present application provides a reusable steel caisson, which can press into the original soil and be pulled up after the concrete pouring of the caisson wall is completed, thereby solving the existing technical problems.

[0004] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows: a reusable steel caisson, comprising standard segments, columns and loading assemblies, the standard segments are divided into an even number of standard blocks, each standard block has side columns on both sides and is formed as a hollow column, and a uniformly distributed slot is formed on one side of the side column; a rectangular reinforcing box is arranged on the inner side to apply downward pressure to press the caisson or upward force to pull up the caisson; a column is arranged between any two standard blocks, and through grooves are formed on both sides of the column to accommodate the two side columns of the standard block; a loading assembly is arranged on the outside of the column of the standard block to apply pressing force or pulling force; the main body of the loading assembly is a double-acting single-piston rod oil cylinder, and a rotary mechanism is arranged on the head of the piston rod; a movable top tooth is arranged on the outside of the rotary mechanism.

[0005] Further, the standard segments are welded from a single layer of steel plate; the cross section is circular, rectangular or polygonal other than rectangular; a grid-shaped semicircular reinforcing rib is arranged on the outer periphery; and a plurality of groups of segments are connected to achieve the standard depth of the caisson.

[0006] Further, the columns are symmetrically arranged to facilitate control of the shape and posture of the caisson.

[0007] Further, connecting plates are arranged between the columns, and transverse pin holes are formed on the connecting plates to connect the columns into a whole by pin shafts.

[0008] Further, the foundation at the bottom of the loading assembly adopts an anti-pulling anchor pile, and the loading assembly is fixedly connected with the anchor pile.

[0009] Further, the movable top teeth are symmetrically arranged on both sides, one side of the top teeth can rotate upward by 90 degrees, and the other side of the top teeth can rotate downward by 90 degrees, and the top teeth are embedded in the slot of the standard block.

[0010] Further, the reusable steel caisson is used for the construction of the caisson of the specified depth by the standard segment superposition, and after the pouring of the inner wall concrete body, the segmented and blocked pulling up is carried out.

[0011] The beneficial effects of the present application are:

[0012] (1) The steel caisson body structure can be recycled, reused, and cost is reduced.

[0013] (2) The conventional upper compression beam is cancelled, the pressure control is more accurate, the attitude control is more accurate, and the influence on the settlement of the surrounding building components is smaller.

[0014] (3) The segmented and blocked pulling up reduces the pulling up loading force and the disturbance to the soil body. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a main structure elevation schematic view of the reusable steel caisson of the present application.

[0016] Figure 2 It is a main structure plane schematic view of the reusable steel caisson of the present application.

[0017] Figure 3 It is a component combination plane schematic view at the column of the present application.

[0018] Figure 4 It is a compression sinking work schematic view of the loading assembly of the present application.

[0019] Figure 5 It is a pulling up work schematic view of the loading assembly of the present application. DETAILED DESCRIPTION

[0020] The present application is further described below in combination with the drawings and embodiments.

[0021] As shown in the drawings, Figures 1 to 5 A reusable steel caisson for the compression sinking construction, comprising a standard block 1, a column 2, a loading assembly 3, an oil cylinder 31, a rotating mechanism 32, a top tooth 33, a top tooth 34, a pin shaft 4, and a connecting plate 5.

[0022] The standard segment of the steel shell caisson is usually welded by a single layer of steel plate; the cross section is mainly circular, and can also be rectangular or other polygons; the outer peripheral surface is arranged with grid-shaped semicircular reinforcing ribs; and is used to connect multiple groups of segments to achieve the standard depth of the caisson.

[0023] The standard segment of the steel shell caisson is evenly divided into an even number of standard blocks 1, and each single block has a side column which is a hollow column body, and a uniformly divided slot hole is formed on one side of the side column; and a rectangular reinforcing box body is arranged inside, which is used to exert downward pressure to press into the caisson, or to exert upward pulling force to pull up the caisson.

[0024] There is a pillar 2 between any two standard blocks 1, with through grooves on both sides to accommodate the two side pillars of the standard blocks.

[0025] The columns are arranged symmetrically. Taking a circular steel caisson as an example, there are usually 4, 8 or more columns, which makes it easy to control the shape and posture of the caisson.

[0026] Connecting plates 5 are arranged between columns 2, with horizontal pin holes on them, and are connected into a whole by pin shafts.

[0027] Loading components 3 are arranged on the outer side of the columns of standard block 1 to apply indentation or jacking forces. The foundation at the bottom of the loading components 3 is preferably an anti-pull-out anchor pile, and the loading components 3 are fixedly connected to it.

[0028] The main body of the loading component 3 is a double-acting single-piston rod hydraulic cylinder 31, and a rotary mechanism 32 is provided at the piston rod head.

[0029] The outer side of the rotary mechanism 32 is provided with movable teeth 33. The movable teeth 33 are symmetrically arranged on both sides. One side tooth 33 can rotate upward 90 degrees and the other side tooth 33 can rotate downward 90 degrees. The teeth 33 can be embedded in the slots of the standard block 1.

[0030] This embodiment uses a circular caisson as an example to illustrate the present invention.

[0031] like Figures 1 to 5 As shown, arrange the first section of the caisson. First, place the four columns 2 evenly at the pre-sinking position as shown in the figure. Then, place the four standard blocks 1 between the columns 2. Place the two side columns of the standard blocks 1 inside the through groove.

[0032] Then, the loading assembly 3 is placed on one side of each of the two side columns of standard block 1. The bottom foundation of the hydraulic cylinder 31 is an anti-pull-out anchor pile, and the hydraulic cylinder 31 is fixed there. In this way, the loading assembly 3 is arranged in the corresponding positions of the remaining three standard blocks 1. Then, the oil pipes and circuits of the four hydraulic cylinders 31 and the movable top rod are connected to the control station. At this point, the entire preparation work is completed, and the tamping begins.

[0033] When the sinking begins, the piston rod of the hydraulic cylinder 31 extends one stroke distance, and the top tooth 33 of the rotary mechanism 32 at the head of the piston rod is inserted into the slot of the side column of the standard block 1; then the hydraulic cylinder 31 retracts, driving the column 1 and the standard block 1 to sink together, and the sinking of the first caisson segment begins.

[0034] By externally measuring the attitude of the first caisson segment during the sinking process, as well as the settlement of surrounding building components, the pressure and retraction stroke parameters of the hydraulic cylinders 31 at the four columns can be controlled to pause the downward pressure at a certain point, or even push it upwards, in order to achieve the required sinking process parameters.

[0035] When the first section caisson segment is sunk to the predetermined position, the second section caisson segment is ready to be connected.

[0036] The column 2 is connected on the four fixed position columns 2 of the first section caisson segment, the upper column 2 is connected to the lower column 2 using the pin shaft 4 and the connecting plate 5, then the standard block 1 is inserted into the groove of the column 2, and the layout of the second section caisson segment is completed.

[0037] Referring to the process of sinking the first section caisson, the second section caisson is sunk to the same predetermined position. The above process is repeated to sink the third, fourth, …, n section caisson segments until the predetermined depth of the caisson is reached.

[0038] After the sinking process of the caisson is completed, the soil inside the caisson can be removed, and then the inner formwork is erected inside the caisson, and the pouring of the concrete structure of the shaft wall and the pouring of the concrete of the bottom plate are completed.

[0039] After the pouring of the concrete of the shaft wall and the bottom plate is completed and reaches sufficient strength, the steel caisson can be started to be pulled out.

[0040] First, the standard blocks 1 of the caisson segments are pulled out symmetrically, starting with the standard block 1 of one caisson segment: the piston rod of the oil cylinder 31 is retracted to the bottom, the rotating mechanism 32 is rotated 180 degrees, the top teeth 34 are directed towards the slot hole of the side column of the standard block 1, the piston rod of the oil cylinder 31 is extended by one stroke distance, and the top teeth 34 push the standard block 1 to move upward by one stroke distance; the piston rod of the oil cylinder 31 is retracted to the bottom, the top teeth 34 are automatically rotated and moved away from the slot hole of the side column; then the process is repeated until the standard block 1 on one side is pulled out to the predetermined position.

[0041] Then, after the nth standard block 1 is removed, the (n-1)th standard block 1 is started to be pulled out.

[0042] Third, the above pulling out steps are repeated until the first standard block 1 is completely pulled out of the ground and removed, and then the column 2 is pulled out. In this way, the process of pulling out the entire steel caisson is completed.

Claims

1. A reusable steel caisson, characterized in that: The system includes standard segments, columns, and loading components. Each standard segment is divided into an even number of standard blocks. Each standard block has side columns on both sides, which are hollow columns with evenly spaced slots on one side. Inside, there is a rectangular reinforcing box for applying downward pressure to drive the caisson in or upward force to pull it out. A column is positioned between any two standard blocks, with through grooves on both sides to accommodate the two side columns of the standard block. Loading components are arranged on the outer side of the columns of the standard blocks to apply driving or pulling forces. The main body of the loading component is a double-acting single-piston rod hydraulic cylinder, with a rotary mechanism at the piston rod head. Movable top teeth are arranged on the outer side of the rotary mechanism. The columns are symmetrically arranged for easy control of the caisson's shape and attitude. Connecting plates with transverse pin holes are arranged between the columns, connecting them into a single unit using pins. The foundation at the bottom of the loading component uses pull-out anchor piles, with the loading component fixedly connected to them. The movable top teeth are symmetrically arranged on both sides. One side's top tooth can rotate upward 90 degrees, and the opposite side's top tooth can rotate downward 90 degrees. The top teeth are embedded in the slots of the standard segments. The reusable steel caisson is used for the construction of caissons to complete the specified depth by stacking standard segments. After the inner wall concrete is poured, it is pulled out in segments.

2. The reusable steel caisson according to claim 1, characterized in that: The standard segment is welded from a single layer of steel plate; the cross-section is circular, rectangular, or polygonal except for rectangle; the outer perimeter is arranged with grid-like semi-circular reinforcing ribs; it is used to connect multiple sets of segments to achieve the depth of the caisson.

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