KR100919628B1 - If the excavation where the carbide tip is had excavation bit of the excavation system where the expansion and abridgment are possible - Google Patents

Abstract

PURPOSE: An excavation bit for an excavation device that enable expansion and reduction of excavated plane at which a carbide tip is prepared is provided to be used conveniently by enabling the reuse of an excavation device and an excavation bit. CONSTITUTION: An excavation bit for an excavation device includes a head unit(110), a rod combining unit(120), a bit body(100) and a cutting portion(112). The head unit includes an excavation plane(111), and the excavation plane is combined with the load for transferring power of an excavation device at an upper portion of the head unit. An oil path hole(130) is formed in the bit body, and vertically penetrates the centers of the rod combining unit and the head unit. The cutting unit is inserted into the central portion of an excavation plane horizontally. It is the excavation of the head unit bottom surface of the bit body.

Description

Drilling bit for direct drilling device with expansion and contraction of drilled surface with carbide tip {If the excavation where the carbide tip is had excavation bit of the excavation system where the expansion and abridgment are possible}

The present invention relates to a drilling bit for direct drilling apparatus capable of expanding and contracting the excavated surface provided with a carbide tip,

More specifically, in the direct drilling grouting method where the steel pipe is inserted at the same time as the ground drilling, the special configuration of the bit for drilling the ground enables to perform the ground drilling and steel pipe insertion at the same time while using the existing jikcheon factory. Of course, it relates to a drilling bit for the drilling machine that can expand and contract the cemented carbide tower so that all the power transmission rods and drilling bits of the direct drilling machine can be pulled out through the inside of the steel pipe after the completion of the drilling work.

The steel pipe grouting method is an underground excavation aiding method that improves the order while reinforcing the ground.The steel pipe is installed on the ground, and the packer is installed inside the steel pipe to inject grout material to inject the grout material into the ground. It is characterized by increasing the shear strength of the soil and rock, and it is a very advantageous method in terms of workability and economical efficiency since the injection is performed in the steel pipe.

The steel pipe grouting method has been widely used as a part of the tunnel reinforcing method in recognition of its effect.

In general, the steel pipe grouting method includes the steps of drilling the ground, inserting a steel pipe provided with a strainer (groove injection part) in the drilled hole, inserting a sealing material between the steel pipe and the hole, and installing a packer. While the cement is made.

However, this method has a problem in that it is difficult to insert the steel pipe due to the collapse of the drilling hole or the mixing of foreign matters in the soft soil ground in which the drilling hole is not naturally maintained because it proceeds by inserting the steel pipe after the drilling.

In order to solve the above problems, as shown in FIGS. 1 and 2, a direct drilling apparatus has been devised that enables steel pipe insertion and ground drilling at the same time.

1 is a straight mill of the grout material injection hole (1a) is a female screw processing on the inner circumferential surface of the distal end portion of the steel pipe (1) equipped with the strainer (2) is screwed with the drill bit (10) is a male screw on the outer circumferential surface, It can be seen that the steel pipe 1 and the drill bit 10 are directly coupled.

On the other hand, the jikcheon factory of Figure 2 is a steel pipe (1) equipped with a strainer (2) and a drill bit (10) is screwed into the grout material injection hole (1a) and at the same time the power transmission rod 20 is integrally coupled It can be seen that the configuration.

However, the conventional direct drilling apparatus having such a configuration is a configuration in which the drilling bit 10 is screwed to the steel pipe 1 in both the front and the latter, and thus the reuse of the drilling bit 10 is impossible, and in the latter case, the power transmission rod ( It is impossible to reuse even up to 20), thereby increasing the material cost. In some cases, the power applied to the drilling bit 10 from the outside is directly transmitted to the steel pipe 1 so that the grout injection hole of the steel pipe 1 There were various problems such as the strainer 2 mounted on 1a) easily detached or deformation occurred in the steel pipe.

The present invention has been made to solve the above problems, to manufacture a drill bit of a special structure that automatically expands and contracts the excavation surface is provided with a carbide tip to determine the size of the drilling diameter and the conventional direct drilling It can be applied to the device (power transmission rod) as it is,

When drilling, it is possible to carry out the ground drilling and steel pipe insertion at the same time by using the existing Jikji factory as it is automatically expanded by the drilling surface of the drilling bit. Is automatically reduced so that it can be pulled out through the inside of the steel pipe,

As a result, the aim is to make it possible to reuse not only the existing direct drilling device (power transmission rod) but also the drilling bit.

Carbide tip for direct drilling apparatus capable of expanding and contracting (automatically) the digging surface equipped with a carbide tip of the present invention for achieving the object described in the technical problem to be achieved by the above invention is basically a bottom The head portion is provided with the combined excavation surface,

The rod coupling portion is formed on the upper portion of the head coupled to the power transmission rod of the perforator,

To form a bit body formed with a flow path hole for vertically communicating the rod coupling portion and the center of the head,

Forming a cutout transversely recessed in the center of the excavation surface of the bottom of the head of the bit body,

By hinge-bonding the inside of the pair of bit blocks, each of which has an excavation surface with a carbide tip at the bottom, respectively, into the incision,

The pair of bit blocks are rotated inward and outward at the same time around the hinge, respectively, and the excavation surface is configured to be expanded (expanded) or contracted (retracted) inward.

Since the drilling bit for direct drilling device of the present invention is configured to automatically expand and contract the excavation surface provided with cemented carbide tip, when installed and used in the existing direct drilling device (power transmission rod), the drilling With the automatic expansion of the drilled surface of the bit, you can obtain the drill hole of the desired size, so you can use the existing Jikji factory as it is and perform both ground drilling and steel pipe insertion at the same time. The drilling surface of the drill bit is automatically reduced and can be pulled out through the inside of the steel pipe.

Therefore, the drilling bit for the direct drilling device of the present invention can be reused as well as the existing drilling device (power transmission rod), as well as the drilling bit is very convenient to use and can significantly reduce the material cost, such as several It is a very innovative invention that has its advantages.

1 and 2 are cross-sectional views showing a conventional direct hole grouting device.

3A, 3B, and 3C are diagrams illustrating one configuration of a drilling bit for a direct drilling apparatus of the present invention.

Figure 3a is a bottom perspective view.

3B is a bottom view.

3C is a side cross-sectional view.

Figure 4 is another configuration of the drilling bit for direct drilling apparatus of the present invention.

Figure 5a, Figure 5b is a state diagram of use of the drilling bit for direct drilling apparatus of the present invention,

Figure 5a is an operating state of the drilling bit at the time of drilling.

Figure 5b is an operating state of the punch bit at the withdrawal.

♣ Explanation of symbols for the main parts of the drawing

1: steel pipe 100: beet body

110: The head part 111,141: Excavation surface

111a, 141a: carbide tips 112: incision

112a and 142: grooves 113 and 130: euro ball

120: rod coupling portion 140: bit block

150: hinge

Hereinafter, an embodiment of a drilling bit for a direct drilling apparatus in which the expansion and contraction of the excavation surface provided with the cemented carbide tip of the present invention is automatically described in detail with reference to FIGS. 3A to 5B.

Drilling bit for a direct drilling device of the present invention is the excavation surface 111 is coupled to the cemented carbide tip 111a on the bottom surface of the head portion 110 constituting the bit body 100 as shown in Figure 3a to 3c It is provided.

In addition, a rod coupling part 120 coupled to the power transmission rod 20 of a perforator (not shown) is formed at an upper portion of the head part 110.

The rod coupling portion 120 has a female coupling portion 120 or a female coupling portion 120 coupled to the power transmission rod 20 depending on whether a male thread portion is formed at the front coupling portion of the power transmission rod 20. As the male threads are formed separately, they can be modified in various forms if they can be combined.

Meanwhile, a flow path hole 130 is vertically formed at the center of the rod coupling part 120 and the head part 110.

On the other hand, in the center of the excavation surface 111 of the bottom of the head portion 110 of the bit body 100 is formed a transversely recessed portion 112, the inside of the incision 112, respectively, carbide tips on the bottom Hinge 150 is coupled to the inner side with a pair of bit blocks 140 having an excavation surface 141 provided with 141a inserted therein.

Therefore, the pair of bit blocks 140 are rotated inward and outward at the same time around the hinge 150, respectively, and the excavation surface 141 is configured to expand (unfold) outward or contraction (retract) inward. will be.

Here, the drilling bit for the direct drilling apparatus of the present invention may be configured by further forming the flow path hole forming grooves 142 inside the pair of bit blocks 140, respectively.

On the other hand, the drilling bit for direct drilling apparatus of the present invention may be configured by further forming a flow path forming grooves 112a in the center of the upper surface of the cutout portion 112 of the head portion.

Meanwhile, the drilling bit for the direct drilling apparatus of the present invention further forms an auxiliary flow passage 113 through which the inner passage hole 130 is penetrated on one side of the outer surface of the head unit 110 as shown in FIG. It can also be configured.

The drilling bit for the direct drilling device of the present invention configured as described above may be installed and used in the power transmission rod 20 of the existing direct drilling air. At the time of drilling, the tip of the pair of bit blocks 140 is rock or other. When the abutment surface is touched, the tip is slightly wider outward than the center line of the hinge 150, so that the pair of bit blocks 140 rotate at the same time to the outside at the same time around the hinge 150, so that the excavation surface 141 is rotated. It extends outwards.

Therefore, if the drilling bit for the direct drilling device of the present invention is used, the drilling is performed in a state in which the excavation surface 141 is more expanded than the outer diameter of the steel pipe 1, and thus the ground drilling and steel pipe insertion are made while using the existing factory. Can be performed simultaneously.

At this time, in the construction of the drilling bit for the direct drilling apparatus of the present invention, the flow path forming grooves 142 are further formed inside the pair of bit blocks 140, respectively, (112) The flow path forming grooves 112a are further formed at the centers of the upper surfaces, or as shown in FIG. 4, the inner flow paths 130 and the auxiliary flow paths 113 penetrating the outer side surfaces of the head part 110 are further added. When formed, the supply of cutting water and discharge of the cut sludge through the respective flow path forming recesses 142 and 112a or the flow path 113 proceed very easily.

On the other hand, when the ground drilling and steel pipes are drawn to the predetermined depth and the Jikcheon plant is withdrawn, the pair of bit blocks 140 which are extended as the power transmission rod 20 retreats, the top surface of the steel pipe 1 As the pair of bit blocks 140 are rotated inward with respect to the hinge 150 while being in contact with the tip, the excavation surface 141 is reduced (retracted) inward.

Therefore, when the drilling bit for the direct drilling apparatus of the present invention is used, the drilling bit 20 as well as the power transmission rod 20 can be pulled out through the inside of the steel pipe 1.

When the drilling bit for the direct drilling device of the present invention is used as described above, the excavation surface 141 of the bit block 140 constituting the drilling bit is automatically expanded, and thus the ground drilling and steel pipe insertion are performed while using the existing direct drilling factory. Simultaneously with this, of course, if the withdrawal of the factory directly after drilling is completed, the excavating surface 141 of the bit block 140 is automatically reduced and can be drawn out through the inside of the steel pipe (1) for the direct drilling device of the present invention The punch bit can be reused not only in the existing direct punch device (power transmission rod) but also the punch bit, so it is very convenient to use and the material cost can be drastically reduced.

Claims (4)

delete delete delete The head portion 110 is provided with an excavation surface 111 is coupled to the cemented carbide tip 111a on the bottom, A rod coupling part 120 is formed on the head part 110 to be coupled to the power transmission rod 20 of the perforator. The rod coupling portion 120 and the head portion 110 is configured to form a bit body 100 in which a flow path hole 130 is vertically communicated, In the center of the excavation surface 111 of the bottom of the head portion 110 of the bit body 100 is formed a cut-out portion 112 horizontally concave, The hinges 150 are coupled to the inside of the pair of bit blocks 140 each having the excavation surface 141 having the cemented carbide tip 141a at the bottom thereof into the cutout 112. The pair of bit blocks 140 are rotated inward and outward at the same time around the hinge 150, respectively, and the excavating surface 141 is configured to expand (expand) or shrink (inward) outward. In the drill bit, In addition to the flow path forming grooves 142 to form a vertical communication with the flow path 130 of the bit body 100 inside the pair of bit block 140, at the same time the cutting of the head portion 110 The flow path forming grooves 112a are further formed in the center of the upper part of the upper part 112 so as to be in horizontal communication with the flow path 130 of the bit body 100, or the bit body 100 is formed on one side of the outer surface of the head part 110. By further forming an auxiliary flow path 113 so as to communicate horizontally with the flow path 130 of the), Through the flow path forming groove 142 and the flow path forming groove 112a or the flow path forming groove 142 and the flow path 113, the supply of cutting water or discharge of the cut sludge is combined. Drilling bits for direct drilling apparatus capable of expanding and contracting the excavated surface is provided with a carbide tip characterized in that it is configured.