Pneumatic caisson

Abstract

To provide a pneumatic caisson capable of improving quality by compacting concrete in a working room and improving filling property.SOLUTION: The pneumatic caisson is a pneumatic caisson in which a working chamber 2 is installed in a lower portion of a caisson main body 1 and concrete is placed in the working chamber, and includes a stirring member 10 disposed in the working chamber 2, and a crane 9 as a stirring driving means for stirring the placed concrete by driving the stirring member 10, and is configured to compact the concrete by stirring the concrete by the stirring member 10 and the crane 9.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pneumatic caisson, for example, in which a work chamber is installed below the caisson body, and concrete is poured into this work chamber after the caisson is installed. [Background technology]

[0002] Generally, in the pneumatic caisson construction method, the concrete filling that is poured into the work chamber is not compacted. This is because the construction site is an enclosed space under air pressure, making it impossible to secure construction space by hand, and compaction work is extremely difficult. This compaction work is done to make the concrete poured into the work chamber dense by compacting it.

[0003] For example, the pouring method described in Patent Document 1 involves leaving the excavator's running rails in the work chamber when pouring the filler concrete, and pouring concrete mixed with an AE water-reducing agent-retardant admixture. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-110187 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, in the filler concrete pouring method described in Patent Document 1, the running rails of the excavator are left in the work chamber when pouring the filler concrete, so an air-entraining water-reducing agent retarding admixture is used to improve filling. However, because this pouring method uses an admixture to increase the fluidity of the filler concrete, it is easily affected by the concrete temperature, and if the amount added is small, the desired fluidity effect cannot be achieved, resulting in problems such as a decrease in the quality of the concrete.

[0006] The present invention was made in consideration of the above circumstances, and aims to provide a pneumatic caisson that can compact the concrete in the work chamber to improve its quality and also improve its filling ability. [Means for solving the problem]

[0007] In order to solve the above problem, the invention described in claim 1 of the present invention is a pneumatic caisson in which a work chamber is installed at the bottom of the caisson body and concrete is poured into the work chamber, characterized in that it is equipped with a stirring member arranged in the work chamber and a stirring drive means for stirring the poured concrete by driving the stirring member, and is configured so that the concrete is compacted by stirring it with the stirring member and the stirring drive means.

[0008] Furthermore, the invention described in claim 2 of the present invention is characterized in that, in addition to the configuration described in claim 1, the stirring member is configured to descend into the work chamber from a shaft hole formed in the ceiling slab and deploy when stirring the concrete poured in the work chamber, and is driven by the stirring drive means in this deployed state.

[0009] Furthermore, the invention described in claim 3 of the present invention is characterized in that, in addition to the configuration described in claim 1, the stirring member is formed into a shape in which a rectangular frame portion that is angular in plan view and a plurality of diagonal portions are fixed to intersect with the rectangular frame portion, and is configured to be driven by the stirring driving means within the working chamber.

[0010] Furthermore, the invention described in claim 4 of the present invention is characterized in that, in addition to the configuration described in claim 2, the stirring member has a rotating member formed in an L-shape having a horizontal portion and a vertical portion, the corners of which are rotatably attached to the ceiling slab, an stirring member body connected to the lower end of the vertical portion at the center of the working chamber, and a biasing means that biases in a pulling direction between the cutting edge side end of the stirring member body and the cutting edge, and is configured so that a plurality of the stirring members are installed in the working chamber in a plan view, and the rotating member is rotated by pulling upward the end of the horizontal portion with the stirring drive means, thereby moving the stirring member body diagonally upward in parallel against the biasing force of the biasing means to mix the concrete, while releasing the drive force of the stirring drive means causes the biasing means to pull the stirring member body and move it diagonally downward in parallel to mix the concrete.

[0011] Furthermore, the invention described in claim 5 of the present invention is characterized in that, in addition to the configuration described in claim 2, a plurality of the stirring members are installed in the work chamber when viewed in a plane, and each of these stirring members has a stirring member body arranged in the work chamber and a connecting rod whose lower end is connected to the stirring member body and which passes through a through hole in the ceiling slab to move up and down, and is configured so that by driving the stirring drive means, the stirring member body is moved up and down via the connecting rod to mix the concrete. [Effects of the Invention]

[0012] According to the invention of claim 1, the concrete poured in the working chamber is stirred and compacted by the stirring member and the stirring drive means, so that the concrete in the working chamber is compacted to improve the quality and the filling property. Furthermore, according to the invention described in claim 2 of the present invention, in addition to the effects of the invention described in claim 1, when mixing concrete poured in the work chamber, the agitator member descends into the work chamber from a shaft hole formed in the ceiling slab and unfolds, and by driving it in this unfolded state by the agitator drive means, it is no longer necessary to install the agitator member under pressurized air in the work chamber, and it is possible to improve the ease of installing the agitator member.

[0013] Furthermore, according to the invention described in claim 3 of the present invention, in addition to the effect described in claim 1, by forming a shape in which multiple diagonal lines are intersected and fixed to the square frame portion and configuring it to be driven by an agitation drive means within the work chamber, it is possible to easily compact the concrete within the work chamber and improve its quality.

[0014] Furthermore, according to the invention described in claim 4 of the present invention, in addition to the effect described in claim 2, multiple stirring members are installed in the work chamber when viewed in a plane, and by pulling the end of the horizontal part upward with the stirring drive means, the rotating member is rotated and the stirring member body is moved parallel to the diagonal upward direction against the biasing force of the biasing means to stir the concrete, while by releasing the drive force of the stirring drive means, the biasing means pulls the stirring member body and moves it parallel to the diagonal downward direction to stir the concrete, thereby easily compacting the concrete in the work chamber and improving its quality.

[0015] Furthermore, according to the invention described in claim 5 of the present invention, in addition to the effect described in claim 2, the lower end of the connecting rod is connected to the stirring member body and passes through the through-hole in the ceiling slab, and by driving the stirring drive means, the stirring member body is moved up and down via the connecting rod to stir the concrete, thereby making it possible to easily compact the concrete in the work chamber and improve its quality. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is an enlarged cross-sectional view showing the state in which the agitating member of the pneumatic caisson according to the first embodiment of the present invention is suspended from the shaft hole in the ceiling slab. FIG. [Figure 2] 2 is an enlarged cross-sectional view showing a state in which the agitating member of FIG. 1 is being lowered to the foundation ground of the work chamber and is in the middle of being opened. FIG. [Figure 3] 3 is an enlarged cross-sectional view showing the stirring member of FIG. 2 in a completely opened state on the foundation ground. [Figure 4] FIG. 4 is a plan view of FIG. 3. [Figure 5]3 is an enlarged cross-sectional view showing a state in which the agitator of FIG. 2 is fully opened and compacting concrete poured in a working chamber. FIG. [Figure 6] 10 is an enlarged cross-sectional view showing the state in which the stirring member of the pneumatic caisson according to the second embodiment of the present invention is suspended near the ceiling slab. FIG. [Figure 7] FIG. 7 is a plan view of FIG. [Figure 8] FIG. 10 is a plan view showing a modified example of the stirring member of the pneumatic caisson according to the second embodiment of the present invention. [Figure 9] 10 is an enlarged cross-sectional view showing the state in which the stirring member of the pneumatic caisson according to the third embodiment of the present invention is disposed near the ceiling slab. FIG. [Figure 10] FIG. 10 is a plan view of FIG. [Figure 11] FIG. 10 is an enlarged cross-sectional view showing an agitator member of a pneumatic caisson according to a third embodiment of the present invention. [Figure 12] FIG. 10 is an enlarged cross-sectional view showing the state in which concrete is being compacted by a plurality of stirring members of a pneumatic caisson according to a fourth embodiment of the present invention. [Figure 13] FIG. 13 is a plan view of FIG. [Figure 14] FIG. 13 is an enlarged perspective view showing an installation state of the stirring member in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0018] [First embodiment] FIG. 1 is an enlarged cross-sectional view showing a state in which an agitating member of a pneumatic caisson according to a first embodiment of the present invention is suspended from a shaft hole in a ceiling slab. FIG. 2 is an enlarged cross-sectional view showing a state in which the agitating member of FIG. 1 is lowered to the foundation ground of the work chamber and the swinging member is in the middle of opening. FIG. 3 is an enlarged cross-sectional view showing a state in which the agitating member of FIG. 2 is fully opened on the foundation ground. FIG. 4 is a plan view of FIG. 3. FIG. 5 is an enlarged cross-sectional view showing a state in which the agitating member of FIG. 2 is fully opened and compacting concrete poured in the work chamber. Note that the automatic sling removal device, which will be described later, is shown only in FIG. 5 and is omitted from FIGS. 1 to 4.

[0019] The pneumatic caisson (hereinafter referred to as the caisson body) 1 of this embodiment is used in the construction of a pneumatic caisson method. This pneumatic caisson method is a construction method in which a box body made of, for example, reinforced concrete is constructed on the ground in advance, with a work chamber surrounded by a cutting edge at the bottom, and then an excavator is used to excavate the box body in this work chamber, and the box body is then constructed in layers one by one, and the structure is installed in a predetermined position.

[0020] As shown in Figures 1 and 2, a caisson body 1 of this embodiment has a work chamber 2 installed at the bottom. This work chamber 2 is surrounded by a cutting edge section 3 and a ceiling slab 4. After excavation is complete, concrete is filled into the work chamber 2 to form a concrete filler 5. This concrete filler 5 is constructed to integrate with the caisson body 6, transmit force uniformly to the foundation ground 8, and prevent groundwater from seeping into the caisson body 6.

[0021] A circular shaft hole 4a for installing rigging equipment is formed in the center of the ceiling slab 4. The rigging equipment is used to transport excavated earth and sand from the workroom 2 to the ground, to carry materials in and out of the workroom 2, and for workers to enter and exit the workroom.

[0022] A concrete pouring pipe 7 is disposed on the outer periphery of the ceiling slab 4. This concrete pouring pipe 7 is used to pour fresh concrete into the work chamber 2 from, for example, a concrete mixer truck (not shown) on the ground, in order to form fill concrete 5 in the work chamber 2 as shown in FIG.

[0023] As shown in Figure 1, this embodiment includes a stirring member 10 disposed in a work chamber 2 and a crane 9 as a stirring drive means for driving the stirring member 10 to stir the concrete poured in the work chamber 2.

[0024] The agitator 10 has a circular lower connecting plate 11 with a diameter of 740 mm. The lower end of a swing shaft 12, which extends vertically and is, for example, 2 m long, is fixed to the center of the lower connecting plate 11 by welding. The upper end of the swing shaft 12 is suspended by a crane 9, as shown in FIG. 5. Six swing rods 13, each 1.9 m long, are arranged on the lower connecting plate 11 at regular intervals of 60 degrees around the circumference, surrounding the swing shaft 12. Each swing rod 13 is made of H-shaped steel, and its base end is connected to the lower connecting plate 11 by a hinge (not shown), allowing it to rotate between a vertical position and a horizontal position. The six swing rods 13 are integrated by connecting their respective tips to a swing chain 14, which is, for example, 2 m long, as shown in FIG. 4.

[0025] An upper connecting plate 15 formed in a circular shape with a diameter of 740 mm is inserted onto the swing shaft 12 so as to be movable up and down. This upper connecting plate 15 is suspended by a suspension member 16 that is separate from the crane 9. The upper connecting plate 15 has a space into which the six swing rods 13 can also be inserted when inserted onto the swing shaft 12. Because the upper connecting plate 15 has this space, when each of the six swing rods 13 is rotated to a vertical position, the tip of each rod fits into the space, thereby bundling the six swing rods 13 onto the swing shaft 12.

[0026] The crane 9 used in this embodiment is, for example, a crane for transporting excavated earth and sand from the work chamber 2 to the ground. When compacting concrete poured in the work chamber 2, the crane 9 is connected to the swing shaft 12 via an automatic slinging and detaching device 17 shown in Fig. 5. The automatic slinging and detaching device 17 can be used to remotely perform slinging and detaching operations by operating a remote control (not shown).

[0027] Next, the assembly procedure for the stirring member 10 of this embodiment will be described.

[0028] First, the swing shaft 12 is fixed by welding so that it is in the vertical direction to the lower connecting plate 11. Then, the base ends of the six swing rods 13 are fixed to the lower connecting plate 11 by the hinges so that they can rotate between a vertical position and a horizontal position.

[0029] Next, the tips of the six swing rods 13 that are adjacent to each other are connected by six swing chains 14. When the entire stirring member 10 is to be carried into the work chamber 2, the six swing rods 13 are rotated vertically so that they are aligned with the swing shaft 12, and are then leaned against the swing shaft 12. Then, the tips of the six swing rods 13 are fixed by an upper connecting plate 15, and the six swing rods 13 are bundled together and stored.

[0030] Next, as shown in Figure 1, the oscillating shaft 12 is hung from the crane 9, and the entire agitator 10 is then suspended into the work chamber 2 through the shaft hole 4a and lowered until it hits the foundation ground 8. Thereafter, as shown in Figure 2, the upper connecting plate 15 is removed by being pulled upward by the hanging members 16. This causes the six oscillating rods 13 to unfold from a vertical position to a horizontal position, as shown in Figure 3. In this unfolded state, the upper connecting plate 15 is lowered to the lower connecting plate 11 by the hanging members 16, completing the installation of the agitator 10.

[0031] Since the upper connecting plate 15 is a heavy object having a predetermined weight, it is configured to maintain the six swing rods 13 in an expanded state when the upper connecting plate 15 is lowered to the lower connecting plate 11. Therefore, in this embodiment, it is not necessary to use the shaft hole 4a to install the stirring member 10 under compressed air, which makes it possible to improve workability.

[0032] Meanwhile, fresh concrete is poured into the work chamber 2 from a concrete mixer truck (not shown) on the ground through a concrete pouring pipe 7, forming a concrete fill 5 in the work chamber 2 as shown in Figure 5. At this time, the stirring member 10 with six swing rods 13 deployed is moved up and down by a crane 9, and the concrete poured in the work chamber 2 is stirred, thereby compacting the concrete.

[0033] After the compaction work of the filler concrete 5 by the mixing member 10 is completed, the mixing member 10 is detached from the crane 9 by the automatic sling removal device 17 by operating the remote control of the automatic sling removal device 17. As a result, the mixing member 10 is left buried in the work chamber 2 because it does not have a function for retrieving it after work is completed.

[0034] According to this embodiment, the concrete poured in the working chamber 2 is mixed and compacted using the mixing member 10 and the crane 9, thereby improving the quality of the concrete in the working chamber 2 by compacting it and also improving the filling properties.

[0035] Furthermore, according to this embodiment, when mixing concrete poured in the work chamber 2, the stirring member 10 descends into the work chamber 2 through the shaft hole 4a formed in the ceiling slab 4 and unfolds, and by driving the stirring member 10 in this unfolded state by the crane 9, it is no longer necessary to install the stirring member 10 under pressurized air in the work chamber 2, thereby improving the ease of installation of the stirring member 10.

[0036] In this embodiment, an example in which six rocking bars 13 are provided has been described, but the number is not limited to this and any other number of rocking bars may be provided. In this case, as in this embodiment, it is desirable that the multiple rocking bars 13 be installed at regular intervals at the same angle in the circumferential direction.

[0037] [Second embodiment] Figure 6 is an enlarged cross-sectional view showing the state in which the stirring member of the pneumatic caisson according to the second embodiment of the present invention is suspended near the ceiling slab. Figure 7 is a plan view of Figure 6. Note that the same reference numerals are used to describe parts that are the same as or correspond to those in the first embodiment. The same applies to other embodiments and modified examples. Also, in this embodiment, the automatic sling removal device 17 in the first embodiment is not shown. The same applies to other embodiments and modified examples.

[0038] 6 and 7, the stirring member 20 of this embodiment includes a counterweight 21 formed in the shape of a rectangular parallelepiped that is square in plan view and has a predetermined weight, and four swinging rods 22 made of H-shaped steel that are attached to the four side surfaces of the counterweight 21 and arranged in a cross shape in plan view. When the stirring member 20 is installed in the work chamber 2, the base ends of the four swinging rods 22 are fixed to the four side surfaces of the counterweight 21, and the tip ends of each extend to the vicinity of the cutting edge 3.

[0039] This stirring member 20 is assembled under compressed air, but in order to shorten the assembly time, each component is pre-processed so that after being brought into the working chamber 2, it can be used simply by assembling it.

[0040] According to the stirring member 20 of this embodiment configured as described above, the stirring member 20 having four swinging rods 22 is suspended by the crane 9, and the stirring member 20 is moved up and down by the crane 9 to stir the concrete poured in the working chamber 2, thereby compacting the concrete. This improves the quality of the concrete in the working chamber 2 and also improves the filling properties.

[0041] In this embodiment, an example has been described in which the counterweight 21 is formed in the shape of a rectangular parallelepiped when viewed from above, and a rocking rod 22 is attached to each of its four side surfaces. However, this is not limited to this, and the counterweight may be formed in a pentagonal or greater shape or a circle when viewed from above, and multiple rocking rods may be attached to its side surfaces or peripheral surface. [Modification of the second embodiment] FIG. 8 is a plan view showing a modified example of the stirring member of the pneumatic caisson according to the second embodiment of the present invention.

[0042] As shown in Fig. 8, the agitator 20A of this modified example is formed in a shape in which two diagonal sections 24 are fixed to a rectangular frame section 23 that is a square in plan view and serves as a square frame section. The rectangular frame section 23 and the two diagonal sections 24 are each made of H-shaped steel. For example, the diagonal sections 24 of the agitator 20A are suspended by a crane 9, and the agitator 20A is moved up and down by the crane 9 to agitate the concrete poured in the work chamber 2, thereby compacting the concrete.

[0043] According to the agitator 20A of this modified example configured as described above, the agitator 20A, which has two diagonal lines 24 fixed to a rectangular frame 23 that is square in plan view and is suspended by a crane 9, is moved up and down by the crane 9 to agitate the concrete poured in the working chamber 2, and thus the concrete can be compacted in the same way as in the second embodiment. This improves the quality of the concrete in the working chamber 2 and also improves its filling properties.

[0044] In the second embodiment, the stirring member 20 is formed in a cross shape when viewed from above, and in this modified example, an example is described in which the stirring member 20 is formed in a shape in which two diagonal portions 24 are fixed to a rectangular frame portion 23 so as to intersect, but the shapes are not limited to these and can be changed as appropriate to correspond to the shape of the caisson body 1.

[0045] Specifically, in this modified example, an example has been described in which the rectangular frame portion 23 is formed into a square shape when viewed from above, but it may also be formed into a polygonal shape when viewed from above, as well as a rectangular shape when viewed from above. [Third embodiment] Fig. 9 is an enlarged cross-sectional view showing a state in which an agitating member of a pneumatic caisson according to a third embodiment of the present invention is disposed near a ceiling slab. Fig. 10 is a plan view of Fig. 9. Fig. 11 is an enlarged cross-sectional view showing an agitating member of a pneumatic caisson according to the third embodiment of the present invention.

[0046] 9 to 11, a plurality of agitating members 30 of this embodiment (four in this embodiment) are installed in working chamber 2. Agitating member 30 is formed in an L-shape having horizontal portion 31a and vertical portion 31b, and has a rotating member 31 whose corner portion 31c is rotatably mounted on ceiling slab 4, an agitating member body 32 connected to the lower end of vertical portion 31b at the center of working chamber 2, and a fixing spring 33 as a biasing means for biasing in a pulling direction between the end of agitating member body 32 on the cutting edge 3 side and cutting edge 3.

[0047] As shown in Figures 9 and 10, the agitator body 32 is assembled in a box-like shape using L-shaped steel members on almost the entire surface near the ceiling slab 4 of the work chamber 2, approximately 50 cm from the underside of the ceiling slab 4. As shown in Figure 11, the agitator body 32 is suspended from the ceiling slab 4 of the work chamber 2 by a plurality of hanging members 35. These hanging members 35 are journaled by pins 37 at their fixed ends to the agitator body 32 and at their fixed ends to fixed members 36 of the ceiling slab 4. This allows the agitator body 32 to move left and right. Furthermore, the rotating member 31 has its corners 31c journaled by pins 37 at its fixed portions to fixed members 36, which are fixed to the underside of the shaft holes 4a of the ceiling slab 4.

[0048] Next, the operation of this embodiment will be described.

[0049] The agitator 30 of this embodiment uses the agitator body 32 to agitate the filler concrete 5 below the ceiling slab 4 of the work chamber 2, thereby performing compaction work on the filler concrete 5 below the ceiling slab 4. Specifically, as shown in FIG. 11 , the crane 9 lifts the tip of the horizontal section 31a upward, rotating the rotating member 31 counterclockwise, and moving the agitator body 32 diagonally upward against the biasing force of the fixing spring 33, as shown by the two-dot chain line in FIG. 11, thereby agitating the concrete. Furthermore, by releasing the lifting driving force of the crane 9, the fixing spring 33 pulls the agitator body 32, causing it to move diagonally downward in parallel, thereby agitating the concrete.

[0050] According to this embodiment, four stirring members 30 are installed in the work chamber 2 in a plan view, and by using the crane 9 to lift the tip of the horizontal portion 31a upward, the rotating member 31 is rotated counterclockwise as shown in Figure 11, causing the stirring member body 32 to move parallel diagonally upward against the biasing force of the fixing spring 33, thereby stirring the concrete. Meanwhile, by releasing the lifting driving force of the crane 9, the fixing spring 33 pulls the stirring member body 32, causing it to move parallel diagonally downward, thereby stirring the concrete, thereby easily compacting the concrete over a wide area in the work chamber 2 and improving its quality. [Fourth embodiment] Fig. 12 is an enlarged cross-sectional view showing a state in which concrete is being compacted by a plurality of stirring members of a pneumatic caisson according to a fourth embodiment of the present invention. Fig. 13 is a plan view of Fig. 12. Fig. 14 is an enlarged perspective view showing the installation state of the stirring members of Fig. 12.

[0051] As shown in Figures 12 to 14, in this embodiment, multiple stirring members 40 (four in this embodiment) are installed in the working chamber 2 in a plan view, and these stirring members 40 each have an oscillating blade 41 as the stirring member main body placed in the working chamber 2, and a connecting rod 42 whose lower end is connected to this oscillating blade 41 and which passes through the through hole 4b in the ceiling slab 4 to move up and down.

[0052] The swing blade 41 is assembled from H-shaped steel beams in the shape of a cross in plan view, as shown in Figures 13 and 14. The connecting rod 42 is made of round steel, and its lower end is fixed to the swing blade 41 by welding, while its upper end is connected to the crane 9 via a connecting metal fitting 45.

[0053] The ceiling slab 4 is provided with four through holes 4b through which connecting rods 42 pass. Connecting rod bearings 43 for preventing air leakage are fitted into each of these through holes 4b. Above the connecting rods 42 of these connecting rod bearings 43, sinking weights 44 for sinking the oscillating blades 41 to the foundation ground 8 are attached.

[0054] According to this embodiment, multiple stirring members 40 (four in this embodiment) are installed in the work chamber 2 in a plan view, and these stirring members 40 move the oscillating blades 41 up and down via the connecting rods 42 by driving the crane 9, thereby stirring the concrete, thereby easily compacting the concrete in the work chamber 2 and improving its quality.

[0055] [Another embodiment of the invention] Although various embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be embodied in various other forms, and various omissions, substitutions, modifications, and combinations can be made without departing from the spirit of the invention. These embodiments are included within the scope and spirit of the invention, as well as within the scope of the inventions described in the claims and their equivalents.

[0056] For example, in each of the above-described embodiments, the shape and size of the stirring members 10, 20, 20A, 30, 40 may be changed as appropriate in accordance with the shape and size of the working chamber 2 in which they are installed.

[0057] The above embodiment has been described as an example in which the caisson is circular in plan view, but it can also be applied to caissons of any other shape, such as square, elliptical, etc. In addition, the above embodiment has been described as an example in which one shaft hole 4 is provided, but if the caisson is larger, the number may be increased.

[0058] Here, if the number of shaft holes 4 is, for example, two, they are used to install two pieces of equipment: a manlock and a material lock. The manlock is used when workers enter and exit the workroom 2, and the material lock is used when transporting excavated earth and sand from the workroom 2 to the surface and when transporting materials in and out. [Explanation of symbols]

[0059] 1 Pneumatic caisson (caisson body) 2. Workroom 3 Blade mouth part 4 Ceiling slab 4a Shaft hole 4b Through hole 5. Filler concrete 6 Caisson body 7 Concrete pouring pipe 8 Foundation 9 Crane (agitation drive means) 10 Stirring member 11 Lower connecting plate 12 Oscillating shaft 13 Swing rod 14 Swing Chain 15 Upper connection plate 16 Hanging member 17 Automatic sling removal device 20 Stirring member 20A Stirring member 21 Counterweight 22 Swing rod 23 Rectangular frame (square frame) 24 Diagonal section 30 stirring member 31 Rotating member 31a Horizontal part 31b Vertical section 31c Corner 33 Fixing spring (biasing means) 35 Hanging member 36 Fixing member 37 pin 40 stirring member 41 Oscillating blade (stirring member body) 42 Connecting rod 43 Connecting rod bearing 44 Sinking weight 45 Connecting fittings

Claims

1. A pneumatic caisson in which a work chamber is installed at the bottom of the caisson body and concrete is poured into the work chamber, a stirring member disposed in the working chamber; and a stirring drive means for driving the stirring member to stir the poured concrete, A pneumatic caisson characterized in that the concrete is compacted by stirring the concrete using the stirring member and the stirring drive means.

2. The pneumatic caisson described in claim 1, characterized in that the stirring member is configured to descend and deploy into the working chamber through a shaft hole formed in the ceiling slab when stirring the concrete poured in the working chamber, and to be driven by the stirring drive means in this deployed state.

3. The pneumatic caisson described in claim 1, characterized in that the stirring member is formed into a shape having a rectangular frame portion that is angular when viewed from above and multiple diagonal lines that intersect and are fixed to the rectangular frame portion, and is configured to be driven by the stirring drive means within the working chamber.

4. The stirring member is A rotating member formed in an L-shape having a horizontal portion and a vertical portion, the corner portion of which is rotatably attached to the ceiling slab; an agitation member body connected to a lower end of the vertical portion at the center of the working chamber; and a biasing means for biasing the cutting edge portion in a pulling direction between the cutting edge portion side end of the stirring member body and the cutting edge portion, A plurality of the stirring members are installed in the working chamber in a plan view, The end of the horizontal portion is pulled upward by the agitation drive means to rotate the rotating member, and the agitation member body is translated diagonally upward against the biasing force of the biasing means to agitate the concrete, A pneumatic caisson as described in claim 2, characterized in that when the driving force of the mixing drive means is released, the biasing means pulls the mixing member body and moves it parallel diagonally downward to mix the concrete.

5. A plurality of the stirring members are installed in the working chamber in a plan view, and each of the stirring members has a stirring member body arranged in the working chamber and a connecting rod whose lower end is connected to the stirring member body and which passes through a through hole in the ceiling slab to move up and down, 3. A pneumatic caisson as claimed in claim 2, characterized in that the concrete is mixed by driving the mixing drive means to move the mixing member body up and down via the connecting rod.

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