JPH0619626Y2 - Air plasma cutting equipment for steel pipe foundation piles for construction - Google Patents

Description

[Detailed description of the device] "Industrial application field" The present invention cuts steel pipe foundation piles for medium-sized buildings used for foundation work of medium-sized houses, apartments, offices and bridges from inside by air plasma The present invention relates to an air plasma cutting device for steel pipe foundation piles for construction.

“Prior art” Generally, in the foundation work of medium-sized buildings, the construction method of placing the steel pipe foundation piles on the ground or in the water is implemented, but the height of the placed steel pipe foundation piles varies. For equalization, the steel pipe foundation pile is cut from the inner or outer surface with a gas blower or a cutter. On the other hand, when dismantling an existing building and constructing a new building on the site, it is necessary to remove the existing steel pipe foundation piles, but it is difficult to remove all foundation piles in the soil. Similarly, each company has applied for a device for cutting a steel pipe foundation pile at a certain depth from the ground. In particular, during foundation work for medium-sized houses on the 3rd floor, as shown in Fig. 10, steel pipe foundation piles 1 are placed to avoid disturbing the excavation of soil in the next step.
As shown in the figure, gas blowout is performed at a height of several tens of centimeters from the surface of the earth, then, as shown in Fig. 12, the soil is dug about 1.5 m, and the steel pipe foundation pile 1 is placed at a predetermined height from the excavated surface. After the gas is blown off with, the upper steel pipe foundation pile is removed, the cap 2 is attached to the head of the remaining steel pipe foundation pile 1, and the thirteenth
As shown in the figure, concrete is placed in the excavated place, and cutting work is performed from the outer surface of the steel pipe foundation pile by gas fusing so as to construct the foundation stand 3.

[Problems to be solved by the invention] However, in the case of performing the gas fusing work from the inner surface of the pipe, the cutting work of the steel pipe foundation pile of the above-mentioned conventional medium-sized building is carried out (Japanese Patent Laid-Open No. 5-58200).
No. 4-119361), the temperature inside the pipe becomes high,
The cutting device is also heated and must be heat-resistant, such as the gas fusing hose and the motor cable of the rotation mechanism.Most other cutting devices are mechanical cutters such as grinders, and the cutting speed is very slow. , Was inefficient. Also, some steel pipe foundation piles have an oval shape instead of a perfect circle, so it is difficult to control the distance between the tip of the cutting torch and the pipe inner surface constantly, and the control mechanism is complicated in the grinder cutter cutting. . Steel pipe foundation piles were uneconomical because the pipe diameters were selected according to the building conditions, steel pipe foundation piles of the same diameter were not used, and several cutting devices were used for each pipe diameter. On the other hand, when the steel pipe foundation pile 1 is gas-fused from the outer surface, the cutting work of the steel pipe foundation pile 1 cannot be performed unless it is a portion protruding from the ground surface, which requires cutting work twice, resulting in complicated man-hours. . Moreover, 1.5m
Even in such earth digging work, there is a problem in that the steel pipe piles that project to the surface of the ground by several tens of centimeters interfere with the efficiency of the excavation work.

Therefore, the present invention has been made in view of the above circumstances, and uses an air plasma arc as a heat source for cutting a predetermined position in the ground from the inner surface side of a steel pipe pile to prevent heating of the cutting device by a low heat source, Succeeded in installing in the steel pipe foundation pile, the distance between the air plasma torch and the inner surface of the pipe was kept constant by a simpler means for precise cutting work, and moreover, several types of steel pipe foundation piles could be cut. As a universal cutting device, by cutting a predetermined position in the ground from the inner surface side of the steel pipe foundation pile, it is possible to cut a final predetermined size with one cutting operation, It is an object of the present invention to provide an air plasma cutting device from the inner surface of a steel pipe foundation pile for medium-sized buildings, which can easily excavate soil without being disturbed by the foundation pile and can improve work efficiency. To.

"Means and Actions for Solving Problems" The present invention relates to a pressing member that can be raised and lowered in a building steel pipe foundation pile and presses the inner wall surface of the building steel pipe foundation pile from inside to outside, and the building steel pipe foundation. Cutting of a steel pipe foundation pile for suspension provided with a suspension member having a guide roller that guides while rolling on the inner wall surface of the pile and a cutting member that cuts the steel pipe foundation pile for rotation while rotating along the inner wall surface In the device, a forked fixing member is fixedly provided on the outer surface of the upper and lower ends of the suspension member, and the fixing member protrudes to a side surface opposite to the position of the fixing member, and the tip is driven by an internal drive source to the building steel pipe foundation. A pressure contact member that presses against the inner wall surface of the pile is slidably provided, a rotating member is rotatably fitted in a central portion, and the suspension member is provided with a rotation drive source for driving the rotating member; Secured to the tip of the member via an elastic member. A holding member having a guide roller that moves in contact with the inner surface of the steel pipe foundation pile for building, and an air plasma generation torch that is held by the holding member and faces the inner surface of the steel pipe foundation pile for building,
It consists of an air plasma generation torch and a power source for supplying electricity to the building steel pipe foundation pile and the rotation driving source, and the fixing member and the pressure contact member of the suspension member at a predetermined position in the building steel pipe foundation pile. Inside the steel pipe foundation pile for construction through fixing the suspension member, rotating the rotary member in the suspension member by driving the rotary drive source, and the holding member connected to the elastic member of the rotary member. The air plasma generating torch is opposed to the inner wall surface of the steel pipe foundation pile for building while rolling the guide roller on the wall surface, and the inner wall of the steel pipe foundation pile for building is circulated while irradiating air plasma, and the steel pipe foundation for building is constructed. Due to the structure of cutting the pile, it is possible to cut various types of steel pipe foundation piles by bending the flat bar of the elastic member, and at the same time, the inner surface of the steel pipe foundation pile is operated by the function of the elastic member. The guide roller is always in contact, and even if it is not circular but elliptical or slightly deformed steel pipe, it is a medium-sized building that can run with a constant distance between the inner surface side of the steel pipe foundation pile and the plasma torch tip. An object of the present invention is to provide a cutting device from the inner surface of a steel pipe foundation pile.

[Example] Hereinafter, an example of a cutting device from the inner surface of a steel pipe foundation pile for medium-sized buildings according to the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 11 denotes a steel pipe foundation pile for medium-sized buildings (hereinafter simply referred to as foundation pile) that is vertically driven on the ground. On the other hand, an air plasma cutting power supply device 12 is installed on the ground surface near the foundation pile 11. The suspension member 13 is inserted into the foundation pile 11 by hand or by suspending it with a spring balancer or the like. The suspension member 13 is shown in FIGS.
As shown in the drawing, the casing has a circular cross section, and support legs 14 and 15 are bolted to both upper and lower ends. Support foot 14,1
5 is replaced according to the pipe inner diameter of the foundation pile 11 to be cut, and is formed of a plate material having a bifurcated plane. Suspension member 13
As shown in FIGS. 1, 2 and 6, an air cylinder 16 is attached at a position facing the supporting legs 14 and 15 about the axis of the air cylinder. The piston rod of the air cylinder 16 has a pressure contact member 17, and the window hole 18 of the suspension member 13 is provided.
It projects from and is pressed against the inner surface of the foundation pile 11. The pressure contact member 17 can be replaced with a member having a length corresponding to the pipe inner diameter of the foundation pile 11. Support foot 14,1
5 and the pressure contact member 17 are suspension members 1 for the foundation pile 11.
3 as a fixing member. A motor 20 with a speed reducer is fixedly installed in the suspension member 13 by a fixture 19. The output shaft of the motor 20 (the output shaft of the speed reducer) has a driving gear 21. The driving gear 21 meshes with a driven gear 23 fixed to the rotating member 22. The rotating member 22 is formed in a tubular shape, and the brackets 24, 2 are provided at the axial center position of the suspension member 13.
5 and bearings 26, 27 are rotatably supported. The lower end of the rotating member 22 faces further downward than the suspension member 13, and the flat bar 29 is fixedly mounted by the fixing member 28. The flat bar 29 is made of a flexible spring material. A torch 31 and a guide roller fixing plate 32 of the air plasma cutting device are attached to the lower end of the flat bar 29 by a fixing tool 30.
The guide roller 3 is attached to the tip of the guide roller fixing plate 32.
3 is rotatably supported. The contact position of the guide roller 33 and the mouth end of the torch 31 are positioned so as to maintain a preset gap δ. The air cylinder 16, the motor 20, and the torch 31 are connected to the cables 34 to 36 drawn from the air plasma cutting power source device 12 as well as the ground pile 37. The cable 34 connected to the air cylinder 16 is an air hose, the cable 35 connected to the motor 20 is an electric wire cable, and the cable 36 connected to the torch 31 is both an air hose and an electric wire cable. . The cable 35 is inserted through the rotating member 22 and connected to the torch 31. Further, a scale 39 is attached to the rope 38 that holds the suspension member 13 by hand or suspends it with a spring balancer or the like so that the insertion depth from the mouth end of the torch 31 to the upper end of the foundation pile 11 can be measured. It has become.

Then, as shown in FIG. 7, the foundation pile 1 is made in the same manner as the conventional one.
1 is placed on the ground, and then the suspension member 1 as shown in FIG.
3 is handheld or suspended by a spring balancer or the like and inserted into the foundation pile 11. At the time of this insertion, the insertion depth is measured with the scale 39, and when the mouth end of the torch 31 reaches the position to be cut, the air cylinder 16 is operated to press the pressure contact member 17 against the inner surface of the foundation pile 11. Then, the pressing member 17 and the bifurcated support legs 14 and 15 are supported at three points to fix the suspension member 13 to the inner surface of the foundation pile 11. At this time, the guide roller 33 comes into contact with the inner surface of the foundation pile 11, and the flat bar 29 bends due to the reaction force, and this bending causes the torch 3 to move.
The gap between the mouth end of No. 1 and the inner surface of the foundation pile 11 is set to be a predetermined ground. Next, the drive of the motor 20 is controlled by a motor control device (not shown) to rotate the torch 31 together with the rotating member 22, while supplying air and a cutting current from the air plasma cutting power supply device 12 to the torch 31, As shown in FIG. 9, the foundation pile 11 is cut at a predetermined position. Since the torch 31 cuts the foundation pile 11 by rotating once, the flexible state of the cable 36 can be used to sufficiently maintain the connected state, and it is not necessary to use a rotating connector or the like. . After cutting the foundation pile 11, soil is excavated as shown in FIG. 9, a cap is attached to the head of the foundation pile 11 as in the conventional example shown in FIG. 13, and then concrete is poured. .

When the pipe inner diameters of the foundation piles 11 are different such as 11a to 11c, the supporting feet 14a to 14c, 15a corresponding to the pipe inner diameters.
To 15c and the pressure contact member 17a, and the supporting foot 14a.
~ 14c, 15a ~ 15c and the pressure contact member 17a to fix the suspension member 13 to the inner surface of the foundation pile 11a ~ 11c,
The rotary member 22 can be positioned at the axial center position of the foundation piles 11a to 11c. Further, although a reaction force is applied to the torch 31 at the time of cutting, it can be absorbed by the bending elastic force of the flat bar 29, and by the bending elastic force of the flat bar 29, the foundation piles 11a to 11a.
Even if the inner diameter of the pipe of c changes, it can be used in common without replacement or position change.

Even if the steel pipe diameter of the steel pipe foundation pile for medium-sized construction is changed to some extent, it can be sufficiently absorbed by the change of the stroke length of the piston rod of the air cylinder 16, but when the steel pipe diameter is further changed, the supporting legs 14, 15 and pressure welding are performed. The member 17 is replaced with a member having a size corresponding to the pipe diameter, and only by this replacement, the guide roller and the torch are kept at a constant distance for various steel pipe pipe diameters by the action of the flat bar made of the elastic member. Can be set to

[Advantages of the Invention] As described above, according to the air plasma cutting device for a steel pipe foundation pile for medium-sized construction according to the present invention, the guide roller and the cutting torch for air plasma traveling on the inner surface of the steel pipe foundation pile for medium-sized construction are provided. Since the rotating member is fixed to the flat bar made of elastic material, the cutting torch for air plasma is rotated at a constant interval over the entire circumference of the steel pipe foundation pile for medium-sized construction, enabling highly accurate cutting. Is.

Further, even if the shape of the steel pipe foundation pile is not a perfect circle, and is oval, even if it is deformed, the guide roller reliably travels on the inner surface of the steel pipe by the elastic member of the flat bar,
Or even if the size of the steel pipe diameter of the medium-sized building steel pipe foundation pile is changed, the guide roller and torch are set so as to maintain a constant interval for all steel pipe diameters due to the action of the flat bar made of the elastic member. It On the other hand, if the air plasma cutting device of the present invention is used in the foundation construction of steel pipe foundation piles for medium diameter construction, by cutting a predetermined position in the ground from the inner surface side of the steel pipe foundation piles for medium construction, Regardless of the position on the surface or in the ground during cutting work, the final cutting can be done with a predetermined size, and the soil can be easily excavated without being disturbed by the steel pipe foundation pile for medium-sized construction. The efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a structural view showing an embodiment of an air plasma cutting device from the inner surface of a steel pipe foundation pile for medium-sized construction according to the present invention, and FIG. 2 is a sectional view showing the structure of a suspension member, a torch, etc. Three
FIG. 4 is a plan view of the suspension member viewed from the line II of FIG.
The figure is a bottom view of the suspension member taken along the line II-II of FIG. 2, FIG. 5 is the bottom view of the suspension member above the torch, and FIG. 6 is the view of FIG.
Sectional views taken along line III-III, FIGS. 7 to 9 are views showing a cutting method for foundation work for medium-sized houses according to the present invention, and FIGS. 10 to 13 are cutting methods for foundation work for medium-sized houses in the related art. FIG. 11 …… Residential steel pipe foundation pile 12 …… Air plasma cutting power supply device 13 …… Suspension member, 14, 15 …… Supporting foot 16 …… Air cylinder, 17 …… Pressure contact member 20 …… Motor, 22 …… Rotating member 29 …… flat bar, 31 …… torch 33 …… guide roller

Claims (1)

[Scope of utility model registration request] 1. A steel pipe foundation pile for construction, which can be raised and lowered freely,
A pressing member that presses the inner wall surface of the building steel pipe foundation pile from the inside to the outside, a guide roller that guides the inner wall surface of the building steel pipe foundation pile while rolling, and a building structure that rotates along the inner wall surface. In a cutting apparatus for a building steel pipe foundation pile having a suspension member having a cutting member for cutting the steel pipe foundation pile, a forked fixing member is fixedly provided on the outer surface of the upper and lower ends of the suspension member. , A pressure contact member that protrudes to the side opposite to the position of this fixing member and presses the tip against the inner wall surface of the steel pipe foundation pile for construction by an internal drive source is slidably provided, and a rotating member is loosely fitted in the center portion so as to be rotatable. Then, the suspension member provided with a rotation drive source for driving the rotating member, is fixed to the tip of the rotating member via an elastic member, and abuts on the inner surface of the steel pipe foundation pile for construction and moves. A holding member with a guide roller, and An air plasma generating torch, which is held by a holding member and faces the inner surface of the building steel pipe foundation pile, and an air plasma generating torch, the building steel pipe foundation pile, and a power source for supplying electricity to the rotary drive source, The suspension member is fixed at a predetermined position in the steel pipe foundation pile for construction with a fixing member and a pressure contact member of the suspension member, and the rotating member is rotated in the suspension member by driving the rotary drive source, The air plasma generating torch is opposed to the inner wall surface of the building steel pipe foundation pile while rolling the guide roller on the inner wall surface of the building steel pipe foundation pile through the holding member connected to the elastic member of the rotating member. An air for irradiating the inner wall of the steel pipe foundation pile for building while irradiating with air plasma, and cutting the steel pipe foundation pile for building air of the steel pipe foundation pile for building. Plasma cutting device.