JP4217436B2 - Jig equipment for core boring machine guide - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a guide jig device for a core boring machine used for cutting large-section concrete.
[0002]
[Prior art]
When performing edge cutting and partial removal cutting in repair work of a partly decomposed concrete structure, a wall sawing method, a wire sawing method, or a continuous core boring method is used.
[0003]
By the way, in cutting large cross-section concrete structures, the wall sawing method is unsuitable for cutting large cross-section members because the depth of cutting is restricted by the blade diameter. In addition, the wire sawing method cannot be used to set a cutting wire when there is no space close to the back side of the member like a pier foundation, and it is used indoors because mist is generated during cutting. This method may not be adopted.
[0004]
On the other hand, the continuous core boring method is a method of cutting concrete by drilling a plurality of boring holes partially overlapping each other in a row with a core boring drilling tube. Since the concrete can be drilled at a depth corresponding to the length of the tube, there is no restriction on the cutting depth. Moreover, since the generation amount of dust and mist is small, it can be adopted indoors.
[0005]
By the way, in this type of cutting method, drilling is partially overlapped with the preceding boring hole, so that when excavation resistance is unevenly distributed and the cutting depth is deep, it is difficult to drill with accurate verticality. It becomes.
[0006]
Therefore, there is a type using a core boring machine in which a guide jig is arranged. 5 (a) and 5 (b) show a drilling tube 2 provided with a conventional guide jig 3. The guide jig 3 is provided on the side surface of the drilling tube 2 on the side of the band plate 4. Is provided with a guide tube 5 connected in parallel and relatively rotatable, and excavation is performed in a state where the guide tube 5 is inserted into the already drilled preceding boring hole 1.
[0007]
The band plate 4 is rotatably fitted in a groove formed along the circumference on the surface near the lower end of the drilling tube 2, while the guide tube 5 has substantially the same diameter as the drilling tube 2. A portion of the steel pipe is cut into a vertically split shape, and is attached to the band plate 4 through a fastener 6 provided near the lower end of the notch so that the tube 2 for drilling and the guide tube 5 are relative to each other. It is connected so that it can rotate.
[0008]
Therefore, in the above structure, the drilling tube 2 is supplied into the concrete C and drilled by the drilling bit 2a provided at the tip thereof, and at the same time, the guide tube 5 rotatably supports the drilling tube 2. However, it is supposed that a hole can be drilled while maintaining the verticality by being inserted into the preceding boring hole 1 in parallel.
[0009]
[Problems to be solved by the invention]
However, in such a core boring machine provided with a conventional guide jig, the drilling length is long, and if an obstacle such as hard steel or steel in concrete or hard gravel is encountered, the direction of excavation is warped. In other words, spiral cutting is performed with the guide tube 5 as an axis, and it is difficult to obtain a predetermined continuous cut surface as the drilling proceeds, and there is a high possibility that continuity cannot be secured. In order to ensure the continuity of core boring, it is necessary to maintain the state where the tip bit of the core boring always overlaps the preceding core boring hole, and further improvement in vertical accuracy has been demanded.
[0010]
Also, with this structure, frictional resistance due to contact between the guide tube 5 and the preceding boring hole 1 is likely to occur, so that an external force such as twisting is easily applied to the band tube 2.
Furthermore, since a part of the hole drilling tube is applied to the preceding borehole, there is a problem that cooling water for bit cooling cannot be effectively supplied.
[0011]
Therefore, the present invention has been made in view of such a conventional problem, and in order to ensure the continuity of the core boring, in a state where it always overlaps the preceding boring hole by the drilling tube to which the drilling bit is attached. Provided is a guide jig device for a hole boring machine that is drilled in a row, reduces the frictional resistance with the preceding core boring hole, and can ensure the verticality with high accuracy.
Another object of the present invention is to enable water injection to cool the drilling bit appropriately.
[0012]
[Means for Solving the Problems]
In order to achieve such an object, the present invention cuts the concrete by drilling a plurality of boring holes partially overlapping each other in a large cross-section concrete using a drilling tube of a core boring machine. Oite the guide jig apparatus of core boring machine used in construction method,
A guide plate installed at the upper part of the preceding borehole adjacent to the installation position of the drilling tube, and a guide rod that passes through the guide plate and can be moved up and down into the preceding borehole and is inserted in a non-rotating state. A guide pipe coaxially connected to the outer periphery of the lower part of the guide rod and connected to the lower end of the drilling tube so as to be relatively rotatable, and arranged radially on the outer periphery of the guide pipe and along the inner wall of the preceding borehole Bei example a plurality of guide rollers which roll Te,
The guide pipe is a pair of connection pipes connected to a pair of upper and lower band plates attached to the outer periphery of the lower part of the drilling tube so as to be relatively rotatable, and is coaxially disposed at the lower part of each connection pipe, and the guide pipe is disposed on the outer periphery. A pair of roller support pipes rotatably supporting the rollers,
A pair of connecting plates are provided on one side of the connecting pipe on the side of the drilling tube, the loop ends of the band plates are connected to the inner side of the connecting plate, and cold water is supplied to the outer side of one of the connecting plates. A tube for cold water is fixed vertically, and the tube for supplying cold water is provided between each of the connecting pipes and the tube for drilling, and the tip nozzle portion of the tube is used as a drilling bit at the lower end of the tube for drilling It is characterized by being arranged toward
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a core boring machine provided with a guide device according to the present invention.
[0019]
In the figure, the core boring machine 10 is fixed on a top surface or a side surface of concrete C to be cut, a stand 14 erected on the top of the fixed plate 12, and can be moved up and down along the stand 14. A movable lifting device 16, a motor 18 disposed above the lifting device 16, a lower portion of the lifting device 16, an upper end connected to the shaft 18 a of the motor 18, and the top and bottom of the fixed plate 12. A drilling tube 20 that passes through the concrete C, and a guide jig device that is arranged in parallel with one side of the drilling tube 20 and is inserted into the preceding boring hole 1 adjacent to the cutting position. 22.
[0020]
Then, by lowering the lifting device 16 while rotating the drilling tube 20 by the rotation of the motor 18, the drilling tube 20 is supplied into the concrete C, and a drilling bit provided on the front end surface thereof. Concrete C is drilled with 20a.
[0021]
The guide jig device 22 is connected to the drilling tube 20 via a pair of upper and lower band plates 24 attached to the outer periphery of the lower part of the drilling tube 20 so as to be relatively rotatable. The inside of the boring hole 1 is moved up and down to vertically guide the drilling tube 20.
[0022]
The guide jig device 22 includes a guide plate 26 installed on the preceding boring hole 1 in the concrete C on one side of the fixed plate 12 and the guide plate 26 vertically passing through the guide boring hole 1. The guide rod 28 to be inserted is coaxially disposed at the tip of the guide rod 28, and includes a guide with a roller having a diameter slightly smaller than the diameter of the preceding boring hole 1.
[0023]
Each of the guides with rollers includes a pair of upper and lower connection pipes 30 connected to the band plate 24, a pair of roller support pipes 32 arranged coaxially at the lower part of each connection pipe 30, and a set of the upper and lower pipes 30 and 32. It consists of an intermediate sleeve 34 that is vertically separated.
[0024]
Further, a cooling water supply tube 36 is provided between the jig device 22 and the hole drilling tube 20 so as to pass up and down the guide plate 26, and the tip nozzle portion 36a of the tube 36 is connected to the bit 20a. When drilling, cooling water is supplied by a cooling water pump (not shown) connected to the tube 36 and ejected from the tip of the nozzle 36a toward the bit 20a, thereby suppressing heat generation due to drilling. Yes.
[0025]
2 and 3 show a detailed structure of the jig device 22 and cross sections of the respective parts.
First, the guide rod 28 has a rectangular cross section, whereas the rod insertion hole of the guide plate 26 has a rectangular hole shape (not shown). By this non-circular fitting, a hole drilling tube is formed. The rotation of the guide jig device 22 accompanying the rotation of 20 is suppressed.
[0026]
Next, as shown in FIGS. 2 and 3A, the upper part of the connection pipe 30 and between the connection pipe 30 and the support pipe 32, between the pipes 30 and 32 and the intermediate sleeve 34, and the lower side support pipe 32. A horizontal flange 38 for coaxial positioning having a slightly larger diameter is integrally provided on the bottom surface of each of the pipes 30, and the pipes 30, 32 and the intermediate sleeve 34 are connected coaxially. Further, by inserting and fixing the guide rod 28 in a square hole 38a provided at the center of each horizontal flange 38, the guide jig device 22 constituted by the pipes 30 and 32 and the intermediate sleeve 34 is prevented from rotating. .
[0027]
Next, as shown in FIGS. 2 and 3B, a pair of parallel connection plates 40 are integrated with one side of each connection pipe 30.
The connecting plate 40 is joined by bolts 42 with a pair of vertical connecting pieces 24a formed on both sides of the loop end of the band plate 24 positioned inside, whereby the outer periphery of the distal end portion of the drilling tube 20 is joined. The two upper and lower portions are rotatably supported.
[0028]
In addition, the cold water supply tube 36 is integrally fixed to the outside of one of the connection plates 40 by welding, and the welding positions are two locations of the upper and lower connection plates 40, thereby the cold water supply tube 36 is The nozzle 36a can be kept in a stable state and directed toward the drilling bit 20a.
[0029]
Next, as shown in FIGS. 2 and 3C, four pairs of vertical plates 44 are radially integrated on the outer periphery of each roller support pipe 32, and guide rollers 46 are interposed between the plates 44. A bearing is rotatably provided via a rotating shaft 48.
[0030]
As shown in FIG. 4, each guide roller 46 is in contact with the inner wall 1 a of the preceding boring hole 1 and rolls as the elevating of the guide roller 46, whereby the leading boring hole 1 is lowered when the jig device 22 is lowered. The resistance force due to contact with the inner wall 1a is reduced to facilitate drilling, and damage to the band plate 24 and the like is prevented.
[0031]
As shown in FIG. 1, the above-described drilling method using the boring machine 10 is for drilling by rotating and driving the motor 18 and lowering the guide device 16 after positioning and fixing each part above the drilling position on the concrete C. The tube 20 is drilled with a drilling bit 20a provided at the tip thereof.
[0032]
In response to this lowering operation, the jig device 22 is vertically lowered while rolling the guide roller 46 brought into contact with the inner wall 1a of the preceding boring hole 1, and bearings the upper and lower two positions at the tip of the drilling tube 20. Supports and guides vertically while suppressing rotational shake.
[0033]
By repeating the above operations, the succeeding boring holes are sequentially formed in a row partially overlapping the preceding boring hole 1, and the large-section concrete is cut by the continuous core boring holes. Will be secured.
[0034]
When the jig device 22 is rotated during the above-described drilling operation, the guide rod 28 and the guide plate 26 are engaged with each other in a non-circular shape. The hole tube 20 is prevented from rotating while the jig device 22 is used as an axis, and can form a boring hole with high accuracy.
[0035]
Further, since the cooling water is constantly injected through the nozzle portion 36a at the excavation position, heat generation and frictional resistance can be greatly reduced, and the drilling efficiency is improved and the wear of the bit 20a is reduced without imposing a burden on the boring machine 10. Can also be reduced.
[0036]
In the above embodiment, the guide with roller is divided into two sets of the connecting pipe 30, the roller supporting pipe 32, and the intermediate sleeve 34, and each is connected to the coaxial positioning state by the horizontal flange 38. Of course, you may do.
[0037]
【The invention's effect】
As is apparent from the above description, in the guide jig apparatus for the core boring machine according to the present invention, the frictional resistance with the preceding core boring hole can be reduced, and the verticality can be ensured with high accuracy. Moreover, in this invention, the water injection for cooling the bit for drilling can be performed exactly.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a state of drilling by a core boring machine to which a guide jig device of the present invention is attached.
FIG. 2 is a side sectional view showing the main part.
3A to 3C are cross-sectional views taken along lines AA, BB, and CC in FIG.
FIG. 4 is a side sectional view taken along line DD in FIG. 3 (c).
FIG. 5A is a side view of a drilling tube provided with a conventional guide jig, and FIG. 5B is a cross-sectional view of the tube.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Leading boring hole 1a Inner wall 10 Core boring machine 20 Drilling tube 20a Drilling bit 22 Guide jig device 24 Band plate 24a Connecting piece 26 Guide plate 28 Guide rods 30, 32, 34 Guide tube (30 connecting tube, 32 roller support tube, 34 intermediate sleeve)
36 Cooling water supply tube 36a Tip nozzle 40 Connection plate 46 Guide roller

Claims (1)

For drilling a core boring machine used in the method of cutting concrete by drilling a plurality of boring holes partially overlapping each other in a large section of concrete with a tube for drilling the core boring machine. Oite to the fixture,
A guide plate installed on the upper portion of the preceding borehole adjacent to the installation position of the drilling tube, and a guide rod that passes through the guide plate and can be moved up and down into the preceding borehole and inserted in a non-rotating state. A guide pipe coaxially connected to the outer periphery of the lower part of the guide rod and connected to the lower end of the drilling tube so as to be relatively rotatable, and arranged radially on the outer periphery of the guide pipe and along the inner wall of the preceding borehole Bei example a plurality of guide rollers which roll Te,
The guide pipe is a pair of connection pipes connected to a pair of upper and lower band plates attached to the outer periphery of the lower part of the drilling tube so as to be relatively rotatable, and coaxially arranged at the lower part of each connection pipe, and the guide pipe is provided on the outer periphery. A pair of roller support pipes rotatably supporting the rollers,
A pair of connecting plates are provided on one side of the connecting pipe on the side of the drilling tube, the loop ends of the band plates are connected to the inside of the connecting plates, and cold water is supplied to the outside of one of the connecting plates. The tube for cold water is fixed vertically, and the cold water supply tube is piped between each of the connecting pipes and the drilling tube, and the tip nozzle portion of the tube is used as a drilling bit at the lower end of the drilling tube A jig device for guiding a core boring machine, characterized by being arranged toward

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