KR20090132734A - Protrusion forming machine for ground boring - Google Patents

Abstract

PURPOSE: A protrusion forming machine for ground boring is provided to improve main surface friction force generated between a pile and the ground and front end support force generated on the front end surface of the pile. CONSTITUTION: A protrusion forming machine for ground boring comprises a hydraulic cylinder unit(60), a horizontal rotating unit and a vertical actuator. The protrusion forming machine comprises a cooling unit and a hydraulic controller. A piston(62) is formed at the both sides of the hydraulic cylinder unit. A hydraulic motor(63) for the bit rotation is connected to the outside of one piston. A tricon bit(64) is mounted on a shaft(66) of the hydraulic motor for the bit rotation. The hydraulic motor for bit rotation reciprocates through a slide(68) formed inside a frame(55). The horizontal rotating device horizontally rotates the hydraulic cylinder unit. The vertical operating device vertically moves the hydraulic cylinder unit. The cooling unit cools the tricon bit.

Description

Projecting machine for ground drilling {PROTRUSION FORMING MACHINE FOR GROUND BORING}

The present invention relates to a ground forming protrusion forming machine, and more particularly to a perforating protrusion forming machine to form a projection around the perforation during ground drilling.

All civil and building structures are constructed on the ground, and if the foundation is constructed on soft ground compared to the weight of the structure, excessive uneven settlement occurs due to lack of support, which threatens the safety of the constructed structure. In this case, the pile is installed on the ground, and the load of the upper structure is designed and constructed to support the load of the upper structure by using the frictional force expressed in the hard ground or the pile and the adjacent ground. In the case of the pile construction method, when the load of the structure is large, the pile is constructed through the process of drilling → inserting the reinforcing material → placing concrete → curing in the field directly without using the factory-made pile.

Site casting piles are expensive because they are applied to structures with relatively high loads. As the size and weight of structures increase rapidly, the amount of bearing capacity for one pile is also increasing. Therefore, the use of ready-made piles with small nave bearing capacity produced in the factory, such as steel pipe piles and concrete piles, is being suppressed, and the construction of on-site placing piles with large bearing capacity manifested directly in the field is increasing. The site-cast concrete piles can be excavated in a circular or rectangular form to a deep depth by a large excavation equipment directly on the site, and the diameter of the pile that is normally constructed is usually variously constructed up to 35 ~ 350cm. In general, the construction method of the cast-in-placement pile is as follows.

* Press or rotate the same casing in the ground as the pile to be constructed

* Drilling by excavation of soil or special bits in the casing

* Once excavation is completed, remove slime

* Insertion of steel reinforcement such as rebar mesh or steel pipe, H-Beam

* Concrete or cement paste pour

* Concrete curing

* Construction completed

Since the existing cast-in-place piles are constructed directly at the site, the planned bearing capacity does not develop due to the failure of the cast-in-place concrete, the material separation of the concrete, and the failure of the slime removal at the tip of the pile. In addition, the field placing pile (diameter: 350 ~ 800mm) of small and medium diameter is difficult to apply to a relatively large load because there is not enough bearing capacity expressed through the above process. The pile construction method applied in the general design is as follows.

Construction method Construction Outline pile material Normal parish Bearing capacity (ton) caliber (mm) pros and cons Advantages Disadvantages   Driving pile  Inject the pile directly into the ground by driving the head of the pile with a hammer.  Steel pipe or high strength concrete  50-150  350-800  -Large impact energy allows easy pile penetration -Noisy vibration, so it is difficult to apply in downtown.-Damage to piles    Purchase stake  -Excavate the ground first with auger or T-4, inject cement milk through screw, insert steel pipe or concrete pile, and perform final stroke.  Ready-made pile + cement milk 80-150 350-600  -No noise during construction  -There is a high possibility of problems in the development of leading and principal friction in accordance with the construction process.-Therefore, it is difficult to control quality during construction.       Cast-In Place Pile  Medium-caliber cast-in-place pile  -Excavate the ground with Auger or T-4, place remicon in the excavated ball, and cure after inserting reinforcing bar, H-beam, porous steel pipe, etc.  Concrete + H section steel or rebar net, concrete pile 50-250 400-800 -No noise and vibration-Larger bearing capacity than small diameter piles-Factory cost available for pile piles  -The bearing capacity is severely up and down depending on the construction condition.-Therefore, the construction management is difficult.-The bearing capacity is not large compared to the diameter.   Large Diameter Cast Placement Pile -The drill rod is mounted at the end of the drill rod and rotated to excavate the rock, and the crushed rock is discharged through the drill rod pipe, and the discharged circulated water is put back into the excavation hole through the collector. Rebar Net + Concrete 1000-5000 1000-3500  -Continuous work and deep depth work-Low noise, low vibration, fast digging speed-Easy water work -Amber stones larger than drill bits are not excavated.-Possibility of bearing capacity defect due to pile tip and ground disturbance.-Difficult to treat excavated soil

As shown in <Table 1>, the embedded pile and the cast-in-place pile show various bearing capacity even when constructing piles of the same specifications according to the ground conditions and construction conditions of the site. In addition, the development of bearing capacity of medium-caliber cast-in-place piles with 10 ~ 20% larger diameter piles than the embedded piles often does not occur clearly depending on the site ground and construction conditions. Therefore, the permissible bearing capacity that a single pile can bear is usually designed in the range of 50 ~ 120ton for the type pile, and in the case of the embedded pile, it is constructed in the 80 ~ 180ton category. Even when using a large aperture, in some cases, it has been reported to have a bearing capacity similar to that of a pile pile or an increase of about 30%. Therefore, medium-caliber cast-in-place piles can be applied in the range of approximately 100-250ton permissible bearing capacity. In addition, large diameter cast-in-place piles are basically applied to grounds that require more than 1000ton of allowable bearing capacity. In Korea, due to technical limitations in predicting the bearing capacity of cast-in-placement piles, excessive safety factors are applied to solve the uncertainty. However, even in this situation, about 30% of the piles constructed have not satisfied the design bearing capacity. Therefore, unnecessary construction costs are wasted due to excessive application of safety factor. Nevertheless, some piles are used to construct bad piles. Therefore, it is necessary to develop the construction method that can reduce the construction cost by reducing the volume of pile by maximizing the principal friction and tip bearing capacity under the same construction conditions, that is, the same size and construction depth of pile. to be.

As shown in <Table 1>, it is unclear to develop bearing capacity according to the ground conditions and construction conditions. Therefore, the construction method should be improved so that the pile can be supported safely.

In addition, since there is no dedicated on-site pile construction method that can exhibit 300 ~ 800 ton of the design power of the main building in case of embedded pile or on-site placing pile, the number of piles is increased by applying purchase or medium diameter pile method at home and abroad. It is uneconomical construction by showing the support of the main design using the site-installed pile construction equipment.

The present invention is to overcome the above-mentioned conventional problems, an object of the present invention is to form a protrusion on the pile by forming a projection in the drilling holes in the rock bed of self-supporting soil and weak strength that does not require a separate casing, pile The present invention provides a ground perforation forming machine for improving the main frictional force exerted between the ground and the ground and the tip bearing force exerted in the pile tip area.

As an example of the ground forming projections according to the present invention,

A piston is provided on both sides, and a bit rotation hydraulic motor is connected to an outer side of one piston, and a tricon bit is mounted on a shaft of the bit rotation hydraulic motor, and the bit rotation hydraulic motor is provided with a slide provided in the frame. Hydraulic cylinder device reciprocating through,

A horizontal rotating device for horizontally rotating the hydraulic cylinder set;

A vertical operation device for vertically raising and lowering the hydraulic cylinder set;

A cooling device for cooling the tricon bit,

Hydraulic control device for contracting and expanding each piston of the hydraulic cylinder set and for rotating the horizontal rotating device.

It consists of.

A bit rotation hydraulic motor is connected to the outer side of the other piston, and a tricon bit is mounted on the shaft of the bit rotation hydraulic motor, and the bit rotation hydraulic motor is reciprocated through a slide provided in the frame or the outside of the other piston. The pressure plate is mounted on the side, and the stroke of the piston to which the tricon bit is mounted is longer than the stroke of the piston to which the pressure plate is mounted.

The horizontal rotating device is provided with a bearing cover with gears on the outer periphery of the frame, a swing hydraulic motor is mounted on the upper portion of the bearing cover, and a gear is provided on the motor shaft of the swing hydraulic motor. Meshing to rotate the frame, thereby causing the hydraulic cylinder to rotate.

The vertical actuating device includes a head part of a connecting rod in a bearing cover, a bearing is mounted between the head portion and a bearing cover, and a plurality of connecting rods are connected, and the connecting rod is a known connecting rod connecting device and support and It is controlled and operated by the vertical movement device, the connection number of the connecting rod is determined according to the depth of the ground drilling, and it is controlled to form the projection at the desired height of the drilling.

In the lower part of the frame, a slime storage plate for storing the slime generated during the working of the side wall of the perforation by the tricon bit is supported as a support, and a discharge pipe equipped with a filter is provided at the end to discharge the slime accumulated in the slime storage plate. The discharge pipe is provided with a pump, and suction and discharge the slime.

The bearing capacity of the pile is expressed by the friction of the principal surface exerted between the pile and the ground and the tip bearing force exerted on the pile tip area. Therefore, when the pile is initially planned, the pile tip area expansion and the pile protrusion are relatively simple, and the tip and main surface friction are greatly increased. Therefore, it is possible to greatly increase the bearing capacity of the pile without changing the construction method of the pile being carried out. Therefore, by increasing the bearing capacity of the existing pile can increase the stability of the construction pile and significantly reduce the construction quantity of the pile can significantly reduce the construction cost.

What has been described above is just one embodiment for carrying out the ground drilling projection forming machine according to the present invention, the present invention is not limited to this embodiment, as claimed in the following claims of the present invention Without departing from the gist of the present invention, one of ordinary skill in the art will have the technical spirit of the present invention to the extent that various modifications can be made.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1.

The piston 62 is provided on both sides in the hydraulic cylinder 60, and the bit rotation hydraulic motor 63 is mounted on the outer side of the piston 62, and the output shaft 66 of the bit rotation hydraulic motor 63 is provided. The tricon bit 64 is connected. Therefore, the reciprocating motion of the piston 62 also causes the reciprocating motion of the hydraulic motor 63 for rotation and the tricorn bit 64 together, and the tricon bit 64 is driven by the hydraulic motor 63 for rotation of the bit. You will have a rotary motion. The tricon bit 64 may be provided only on one side.

The hydraulic cylinder 60 is supported by the frame 55, and the slider 68 is provided inside the frame 55 to reciprocate the hydraulic motor 63 for rotation of the bit.

The upper portion of the frame 55 is provided with a bearing cover 49 provided with a gear 50 on the outer circumference.

A swing hydraulic motor 40 is mounted on the bearing cover 49, and a gear 51 is provided on the motor shaft of the swing hydraulic motor 40, so that the gear 50 of the bearing cover 49 is provided. And rotate the frame 55, and accordingly the hydraulic cylinder 60 is rotated.

The head portion 29 of the connecting rod 28 is embedded in the bearing cover 49, and a bearing 47 is mounted between the head portion 29 and the bearing cover 49. Several connection rods 28 are connected.

In the lower part of the frame 55, a slime storage plate 80 for storing slime generated during the side wall work of the drilling by the tricon bit 64 is supported as the support 72.

The hydraulic drive pump 12 is driven by the engine 10, and the hydraulic cable 22 for the swing hydraulic motor 40, the expansion hydraulic cable 24 for the hydraulic cylinder 60, and the shrinkage hydraulic cable 32 are provided. The hydraulic cable 633 for the hydraulic motor 63 for rotation of the bit is connected, and the hydraulic cable 22 for the hydraulic motor 40 for the swing is connected to the drive lever 20 and the expansion hydraulic cable for the hydraulic cylinder 60. 24, the expansion lever 14 and the shrinkage hydraulic cable 32 are provided with a shrinkage lever 16, and the drive lever 634 is provided in the hydraulic cable 633 for the hydraulic motor 63 for rotation of the bit.

Water is supplied by the hydraulic pump 36 to cool the heat generated during the excavation due to the rotation of the tricon bit 64 and the water to the tricon bit 64 as the nozzle 367 through the connecting hose 366. Let this be sprayed.

In order to discharge the slime accumulated in the slime storage plate 80, a discharge pipe 801 equipped with a filter 802 is provided at an end thereof, and the discharge pipe 801 is provided with a pump 800, and sucks and discharges slime. Let's do it.

The connecting rod 28 is controlled and operated by known connecting rod connecting devices and supporting and vertical moving devices. The number of connections of the connecting rods 28 is determined according to the depth of the ground perforations and controls to form protrusions at the desired height of the perforations.

Hereinafter, a process of forming protrusions in the perforation by means of the ground perforation protrusion forming machine according to the present invention will be described.

Referring to Figure 3, a substantially circular perforation 100 is formed, and inserted into the perforation 100 of the ground perforation process of the present invention is stopped at the desired height.

The stroke of the piston 62 is determined by the size of the perforation 100 and the size of the projection to be formed.

In addition, the tricon bit 64 is applied in different sizes and shapes depending on the type of ground.

The engine 10 and the pumps 12, 36, and 800 are driven to drive the swing hydraulic motor 40 to horizontally rotate the frame 55 in a desired direction, and to rotate the hydraulic motor 64 for bit rotation. The expansion lever 14 is turned on, causing the piston 62 to move towards the perforation wall.

The projection 102 is formed by advancing toward the wall while the tricon bit 64 connected to the hydraulic motor 64 for rotation of the bit rotates. Once the protrusion 102 is fully formed, the contraction lever 16 is turned on to return the piston 62 to its original position. For example, when the projections are completed in the east and west directions, the portion around the projections is compressed to increase the strength. When the return is completed, the frame 55 is rotated by 90 degrees with the driving force of the hydraulic motor 40 to change from east-west direction to north-south direction and operate in the same manner as the process of forming protrusions in the east-west direction to form protrusions.

When the projection is completed at any depth, the connecting rod 28 is raised to repeat the above operation. When the projections in the east, west, south and north directions are completed, concrete penetrates into the projections to form pile projections.

As the amount of concrete decreases by the pile volume increased with the formation of the projections, the concrete or cement paste is replenished by using ready-mixed concrete immediately after construction is completed. After the replenishment is completed, the reinforcement 105 is inserted and cured to form a pile having protrusions.

Another embodiment of the present invention will be described with reference to FIG. 2.

The perforator for the ground drilling uses one or two bits depending on the size of the construction pile diameter. For example, if the drilling bore is large, two tricorn bits are applied, and for small diameter field-made piles, one tricorn bit is applied.

Instead of using two tricon bits, the pressure plate 164 is used instead of the tricon bits when using one tricon bit. That is, the pressure plate 164 is mounted to the piston 162. The stroke of the piston 64 to which the tricon bit 64 is mounted is longer than the stroke of the piston 162 to which the pressure plate 164 is mounted. Thereby, during operation, the pressure plate 164 touches the perforation on the opposite side of the tricon bit 64, so that the frame 55 does not push back to the pressure plate 164 side, i.e., when the tricon bit 64 rotates. do.

Other than that is the same as the embodiment using the two tricon bits, so a separate description will be omitted.

1 is a cross-sectional view of the ground perforation protrusion forming machine according to the first embodiment of the present invention

2 is a cross-sectional view of the ground perforation protrusion forming machine according to the second embodiment of the present invention

Figure 3 is a cross-sectional view of the perforation formed by the ground perforation protrusion forming machine according to the present invention

<Explanation of symbols for the main parts of the drawings>

10 engine 12 hydraulic driven pump

14 expansion lever 16: shrinkage lever

20: drive lever 22: hydraulic cable for the hydraulic motor

24: Expansion hydraulic cable for hydraulic cylinder

28: connection rod 29: head

32: shrinkage hydraulic cable 36: water pressure pump

37: drive lever for hydraulic pump 40: hydraulic motor for swing

42: housing 47: bearing

49: bearing cover 51: gear

55: frame 60: hydraulic cylinder

62, 162: piston 63: hydraulic motor for bit rotation

64: Tricorn Bit 66: Motor Shaft

68: Slide 72: Support

80: slime storage plate 164: pressure plate

366: connection hose 367: nozzle

633: Hydraulic cable for hydraulic motor for rotation of bits

634: driving lever 800: pump

801: discharge pipe 802: filter

Claims (6)

A piston is provided on both sides, and a bit rotation hydraulic motor is connected to an outer side of one piston, and a tricon bit is mounted on a shaft of the bit rotation hydraulic motor, and the bit rotation hydraulic motor is provided with a slide provided in the frame. Hydraulic cylinder device reciprocating through, A horizontal rotating device for horizontally rotating the hydraulic cylinder device; A vertical operation device for vertically raising and lowering the hydraulic cylinder device; A cooling device for cooling the tricon bit, Hydraulic control device for contracting and expanding each piston of the hydraulic cylinder device, and for rotating the horizontal rotating device Soil forming projections for ground drilling, characterized in that consisting of. The method of claim 1, A bit rotation hydraulic motor is connected to the outer side of the other piston, a tricon bit is mounted on a shaft of the bit rotation hydraulic motor, and the bit rotation hydraulic motor is reciprocated through a slide provided in the frame. Soil forming machine for ground drilling. The method of claim 1, The outer side of the other piston, the pressure plate is mounted, the stroke of the piston is mounted tricorn bit is a projection for forming the ground perforated, characterized in that longer than the stroke of the piston is mounted. The device of claim 1, wherein the horizontal rotating device is The upper portion of the frame is provided with a bearing cover having a gear on the outer periphery, the upper portion of the bearing cover is equipped with a swing hydraulic motor, the gear shaft of the motor of the swing hydraulic motor is provided with a gear of the bearing cover Ground engagement projections, characterized in that the frame is rotated, the hydraulic cylinder is rotated accordingly. The device of claim 1, wherein the vertical actuating device comprises: In the bearing cover, the head of the connecting rod is embedded and a bearing is mounted between the head portion and the bearing cover, and the connecting rod is connected to a plurality, and the connecting rod is connected to a known connecting rod connecting device and a supporting and vertical moving device. Ground control projections are controlled and operated, the connection number of the connection rod is determined according to the depth of the ground drilling, the ground drilling projection forming machine, characterized in that to control to form a projection at the desired height of the drilling. The method according to any one of claims 1 to 3, In the lower part of the frame, a slime storage plate for storing the slime generated when the side wall of the perforation by the tricon bit is supported as a support, and a discharge pipe equipped with a filter at the end to discharge the slime accumulated in the slime storage plate is provided. , The discharge pipe is provided with a pump, the ground forming projection for forming the soil, characterized in that the suction and discharge.

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