JP2015001147A - Ground excavation attachment, excavation method using the same and earth retaining timbering method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new ground excavation technology capable of smoothly and efficiently excavating a large diameter hole in a base rock, without having adverse influence such as vibration and noise on a neighborhood building.SOLUTION: A ground excavation attachment 1 is composed of: a tip pilot head 2 including a plurality of semispherical tip guiding bits 3, 3 and 3, which are opposed so as to secure a passing clearance S1 of a coolant W in a discharge port 22 of a tip guiding cylindrical body 20, pivotally attached at an inclination of 45° to the central axis C of the tip guiding cylindrical body 20, and an attaching-detaching mechanism lower part 60 provided on the upper end of the tip guiding cylindrical body 20; and a main head 4 including a succeeding cylindrical body 40 having an attaching-detaching mechanism upper part 61 on the lower end thereof and a connection part 42 on the upper end thereof, and a plurality of semispherical succeeding bits 5, 5 and 5, which are opposed so as to secure a pilot head 2-installing clearance S2 around the periphery of the succeeding cylindrical body 40, pivotally attached at an inclination of 45° to the central axis C of the succeeding cylindrical body 40. The attaching-detaching mechanism upper part 61 can be non-rotatably combined with and connected to the attaching-detaching mechanism lower part 60.

Description

    The present invention relates to ground excavation technology, and particularly includes the field of manufacturing, providing, and using a drilling device that suppresses the generation of vibration and noise and enables smooth construction of excavation work. From the field of providing, selling and providing equipment and tools necessary for its transportation, storage, assembly and installation, materials necessary for such materials, machinery and parts, such as wood, stone, various fibers, plastics , The field of providing various metal materials, the field of electronic components incorporated in them, the field of control-related equipment that integrates them, the field of various measuring instruments, the field of power equipment that moves the equipment and instruments, Fields generally referred to as industrial machinery, such as the fields of electricity and oil, which are energy sources, as well as testing and researching those facilities and equipment, and displaying and selling them. The fields related to import / export, the results of their use, the equipment used to make them, the fields related to the collection and transportation of garbage debris generated by the operation of machinery and equipment, and the waste debris efficiently There is no technical field that is not related to the recycle field to be reused, to a new field that cannot be envisaged at this time.

(Points of interest)
When installing underground support piles for excavating utility pole holes and retaining soil support methods in hard rock, when excavating ground or excavating ground, construction machines such as backhoes, breakers, and percussion are generally used. Work is carried out using the retaining method for excavation of holes and grounds, but when these construction machines that mainly crush and excavate rocks using impact force are used, heavy crawler construction As the machine moves, the rock mass will be crushed and excavated, generating large vibrations and noise, damaging nearby buildings and structures, and worsening the living environment of residents and facility users. The current situation is that the use of such heavy machinery is restricted and it may be difficult to carry out smooth construction, or the construction may not be carried out substantially. It was.

(Conventional technology)
In order to overcome this situation, the applicant of the present application, as shown in the following Patent Document 1 (1), drills with a rotating shaft passing through the center of the cooling water container and an auger head at the tip of the rotating shaft at the lower end. A pipe is connected and the upper end of the cooling water container is provided with a cooling water supply port and a compressed air supply port, and when excavating a deep buried hole, the auger head is driven to rotate and simultaneously the pressurized cooling water is ejected. , One that can prevent overheating of the auger head due to friction with the excavated soil, and a plurality of conical cutters that are disclosed in Patent Document 1 (2) around the center shaft through which the supply pipe passes vertically In addition, a plurality of peripheral wall injection holes are formed in the peripheral wall of the center shaft, and each conical cutter that revolves around the center shaft as the center shaft rotates is connected to the inner peripheral wall of the excavation hole of each tip. The same friction by contact friction -The rotating shaft rotates in the opposite direction to the shaft, and the coolant supplied through the supply pipe is continuously discharged from each peripheral wall injection port and tip injection port during excavation, and the formation around the cutter head in the excavation hole Has been developed to improve the durability against melting and wear by greatly reducing and cooling the frictional resistance generated by the rotation and excavation of each conical cutter. It was.

However, the excavator shown in the former Patent Document 1 (1) is very effective when excavating a buried hole having a small diameter of 100 to 150 mm to a depth of 10 to 30 m. However, when drilling a larger hole, for example, with a diameter of 450 mm, it is indispensable to expand the auger head, and the latter patent document 1 (2), which was developed as a solution to these problems, The cutter head with multiple conical cutters around it was very effective for excavating large diameters in soft ground, but the gap between the center shaft and each conical cutter was narrow, and each Since the contact area of the cone cutter with the formation is large, when excavating hard ground such as the bedrock layer, pebbles and rock fragments may be bitten into the gap, and each cone cutter And the like or overheating caused the Kosunetsu becomes difficult to obtain a smooth rotation, it was found that it becomes impossible drilling.
(2) JP 5129583 A (2) JP 2011-236560 A (2)

(Awareness of problems)
As described above, the various types of drilling devices that have been proposed so far have been effective for drilling small-diameter deep buried holes or excavating large-diameter buried holes in soft ground. However, there remains a drawback that a large-diameter buried hole cannot be excavated smoothly and quietly in hard rock, and when the large-diameter auger reaches the bedrock, the center of the rotating shaft is shifted so that it slides sideways. It may be difficult to dig without knowing, or it may be difficult to dig into the exact position and it may be difficult to dig or tilt, and construction may be difficult, such as backhoes and breakers trying to avoid this situation If you try to crush and remove the rock using a crawler type construction machine like this, it will cause a lot of vibration and noise, especially excavation work on hard rock layer near the building When doing so, it will cause problems such as damaging nearby buildings and adversely affecting the lives of residents and users of buildings, etc. In addition, it must be excavated sufficiently close to reach the boom arm. However, if the excavation point is located on a buried object or a place where heavy machinery cannot enter such as springs, such a crawler construction machine cannot be used, and the construction means is lost. It will lead to a situation where construction becomes impossible, and it is necessary to solve such problems as soon as possible.

(Object of invention)
Therefore, the present invention is not under the environment where the crawler-type construction machine or the like cannot be used due to various circumstances such as the work space is narrow or the surface ground is roughened in addition to the reason of causing vibration and noise to neighboring facilities. Even so, they are mounted on wheel-type construction machines such as truck cranes and rough terrain cranes that are sufficiently lighter than those, so that large-diameter holes can be drilled smoothly and efficiently in the rock mass without adversely affecting the neighborhood. Judging whether it is possible to develop a new ground excavation technology, we started the development and research very quickly, and as a result of repeating trial and error over a long period of time and many trial productions and experiments, this time we finally have a new structure We succeeded in realizing an attachment for ground excavation, a new excavation method using the same, and a new earth retaining method. With examples representative of the present invention shown in the drawings, and specifically described the configuration.

(Structure of the invention)
As will be clearly understood from the embodiments representing the present invention shown in the drawings, the ground excavation attachment of the present invention basically comprises the following configuration.
In other words, a leading cylinder having a coolant discharge port is provided at the lower end of the cylinder that is sufficiently smaller than the target excavation hole diameter and vertically runs through the supply pipe for coolant, and the coolant passes through the discharge hole of the leading cylinder. A plurality of hemispherical leading bits facing each other so as to secure a clearance for use are axially attached to the center line of the leading cylindrical body at an inclination angle of 30 ° to 60 °, preferably 45 °, toward the center downward. A pilot pilot head with a desorption mechanism lower part at the upper end of the body, a subsequent cylinder having a desorption mechanism upper part at the lower end of the cylinder and a connecting part at the upper end, and a pilot head mounting gap around the circumference of the subsequent cylinder A plurality of hemispherical succeeding bits opposed to each other, and a main head pivotally attached to an inclination angle of 30 ° to 60 °, preferably 45 ° toward the center downward with respect to the center line of the succeeding cylinder, Rotate the top of the desorption mechanism to the bottom of the desorption mechanism The combination in Noh, a ground excavation attachment to summary the configuration assumed connectable.

    The ground excavation attachment consisting of this basic configuration is more specifically shown to have a diameter sufficiently smaller than the target excavation hole diameter, and the coolant discharge is provided at the lower end of the cylinder vertically passing through the supply pipe for the coolant. Provided with a leading cylindrical body having an opening at the outlet, hemispherical leading bits facing each other so as to secure a gap for passing a coolant between them are provided at a plurality of balanced locations around the circumference of the outlet of the leading cylindrical body. The integrated outer diameter of each leading bit coincides with the leading hole diameter sufficiently smaller than the target drilling hole diameter by the shaft mechanism having an inclination angle of 30 ° to 60 °, preferably 45 ° toward the center downward with respect to the center line. The tip pilot head that is attached to the upper end of the guide cylinder and provided with a lower part of the desorption mechanism at the upper end of the leading cylinder and the lower end of the desorption mechanism at the lower end of the cylinder that is smaller than the target excavation hole diameter and vertically passes through the supply pipe for the coolant. Detachable mechanism upper part, the same cylinder A succeeding cylinder having a connecting part for a boring rod at the upper end is provided, and hemispherical succeeding bits facing each other so as to secure a space for mounting the pilot head are provided at the balanced positions around the circumference of the succeeding cylinder. A main head that is axially attached so that the integrated outer diameter of each subsequent bit matches the diameter of the target drilling hole by an axis mechanism having an inclination angle of 30 ° to 60 °, preferably 45 ° toward the center downward with respect to the cylinder center line. An attachment for ground excavation consisting of a structure in which the upper part of the desorption mechanism is non-rotatably connected to the lower part of the desorption mechanism, and can be combined and connected so that each succeeding bit is arranged on the upper outer side of each leading bit. It can be.

    More specifically, a leading cylinder body having a diameter sufficiently smaller than the target excavation hole diameter and having a cooling liquid discharge port opened at the lower end of the cylinder passing through the coolant supply pipe is provided. A hemispherical leading bit facing each other at three locations around the circumference in order to secure a gap for passage of coolant between them is inclined at 45 ° toward the center downward with respect to the leading cylindrical body center line. The shaft mechanism is attached so that the integrated outer diameter of each leading bit matches the diameter of the leading hole sufficiently smaller than the target drilling hole diameter, and the tip pilot head with the lower part of the leading cylindrical body provided with the lower part of the detaching mechanism and the target drilling Subsequent cylinder having a smaller diameter than the hole diameter, an upper part of the detachable mechanism connectable to the lower part of the detachable mechanism at the lower end of the cylinder vertically passing through the supply line for the coolant, and a connecting part for a boring rod at the upper end of the cylinder Each of the three locations around the circumference of the cylinder The integrated outer diameter of each succeeding bit is adjusted by an axial mechanism in which the hemispherical succeeding bit facing the pilot head mounting gap is inclined at 45 ° toward the center downward with respect to the center line of the succeeding cylinder. It consists of a main head that is axially attached so as to match the diameter of the target drilling hole, and the upper part of the attachment / detachment mechanism is non-rotatably connected to the lower part of the attachment / detachment mechanism. It can be said that it is an attachment for ground excavation consisting of a structure that can be connected.

(Related invention 1)
In relation to the above-described ground excavation attachment, the present invention also includes a ground excavation method using the attachment.
That is, the above-described ground excavation attachment that forms the basis of the present invention is a rotation drive source suspended from a suspension device such as a crane, a coolant supply source, and a boring rod that is rotationally driven under the rotation drive source. The drilling rod and the ground excavation attachment are rotationally driven while supplying cooling liquid to be ejected from the discharge port through the subsequent cylinder and the leading cylinder from the boring rod. Cut into the desired location of the layer and drill down while drilling a leading hole with a diameter sufficiently smaller than the target drilling hole diameter to support the rotation center of the ground excavation attachment at the desired location so that it can be stably guided In addition, each subsequent bit of the main head following each pilot bit of the pilot head cuts into a desired portion of the rock layer, and the desired target is drilled. Target drill hole having a hole diameter was made so as to drill to the desired depth, a drilling method of the ground using the attachment for ground excavation that forms the basis of the present invention.

    When this excavation method is expressed in a different manner, the rotational drive source suspended in a suspension device such as a crane, the coolant supply source, and the lower end of the boring rod that is rotationally driven under the rotational drive source, The pilot head of the attachment for ground excavation according to any one of claims 1 to 5 is connected, and only a leading hole is provided so as to reach the bedrock layer at a desired location on the surface layer while supplying a cooling liquid to be ejected from the discharge port. After drilling, the ground drilling attachment consisting of the main head and the pilot head, which is the basis of the present invention, is connected to the lower end of the boring rod, and the drilling is performed first while supplying the cooling liquid to be ejected from the discharge port. The ground surface leading hole is expanded to the target drilling hole diameter, and each pilot head leading bit reaching the rock formation has a tip sufficiently smaller than the target drilling hole diameter. Drilling down while drilling the leading hole of the hole diameter, the rotation center of the ground excavation attachment is supported so that it can be stably guided to the desired location, and each subsequent bit of the main head following each pilot bit of the pilot head However, the ground excavation method using the ground excavation attachment, which forms the basis of the present invention, is designed to cut into a desired portion of the rock layer and excavate the target excavation hole having the desired excavation hole diameter to the desired depth. It can be said.

(Related invention 2)
In relation to the above-described ground excavation attachment, the present invention includes a soil retaining support method using the attachment.
In other words, a pilot hole with a diameter sufficiently smaller than the target excavation hole substantially matching the support pile diameter is drilled on the surface layer of each support pile driving site surrounding the target sedimentation area, and then the leading of the ground layer is guided. This is a rotary drive source suspended in a suspension device such as a crane, a coolant supply source, and a lower end of a boring rod that is rotated under the rotary drive source. The ground excavation attachment, which forms the basis of the invention, is connected, and the coolant is supplied to be ejected from the discharge port. Drilling down the pilot hole with a pilot hole diameter sufficiently smaller than the target drill hole diameter with each pilot bit reaching the pilot head, the rotation center of the ground excavation attachment is set to the desired In addition to supporting the pilot head so that it can be guided in a stable manner, each subsequent bit of the main head following each pilot bit of the pilot head cuts into a desired location of the rock layer and drills the target drill hole of the desired drill hole diameter to the desired depth. After raising the attachment for ground excavation, the lower end of each support pile is driven so that the predetermined range reaches the target excavation hole of the rock layer, and the sheet pile wall is installed across each support pile. The earth retaining support method using the ground excavation attachment that forms the basis of the present invention.

    As described above, according to the ground excavation attachment of the present invention, unlike the conventional ones, the large-diameter excavation hole can be efficiently and smoothly formed in the hard rock mass from the characteristic features as described above. Drilling work can be remotely controlled from a position separated from the distance of the turning radius of the crane by making it small and light and mounted on a wheel-type construction machine. Excessive vibration and noise will not be exerted on other facilities, and the crane can be extended for excavation so that the construction equipment can be prevented from entering underground facilities or springs. So, until now, crawler types such as backhoes and breakers for excavating rocks such as springs, in addition to preventing vibration and noise and preventing damage to nearby buildings and underground structures. Although construction machinery could not be introduced and excavation work itself had to be abandoned, it had a great impact on urban development, etc., but this problem has been solved and it has been impossible until now The excellent feature is that it is possible to smoothly excavate large-diameter holes in the bedrock layer adjacent to buildings and other facilities.

    In addition, each hemispherical bit is arranged at a plurality of balanced positions around the cylinder periphery, with each cylinder mechanism via each axis mechanism with a predetermined inclination angle posture near the center of the cylinder downward. In addition, it is possible to reduce the contact area of the hemispherical bit with the formation, significantly reduce frictional resistance, and to bite pebbles and rock fragments, etc. In order to smoothly excavate hard ground such as rock mass, vibration and noise can be significantly reduced, and a plurality of hemispherical shapes are formed at the lower end of the leading cylinder whose diameter is sufficiently smaller than the target drilling hole diameter. Around the circumference of the pilot head in which each leading bit integrated outer diameter is arranged to match the leading hole diameter sufficiently smaller than the target drilling hole diameter, and the succeeding cylinder that is smaller than the target drilling hole diameter, Multiple hemispherical trailing bits after each Since the main head arranged so that the bit outer diameter matches the target drilling hole diameter can be connected via the attachment / detachment mechanism, the pilot head first drills the leading hole and drills the ground against the ground. The center of rotation of the attachment is able to be supported stably, and the subsequent main head is drilled to expand the leading hole to the target drilling hole diameter. Drilling holes can be drilled much more efficiently.

    Further, a pilot head is connected to the lower end of the main head via a detaching mechanism, passes through the supply pipe for cooling liquid from the succeeding cylindrical body to the discharge port at the lower end of the leading cylindrical body, and each hemispherical leading bit Are attached at a tilt angle of 30 ° to 60 °, preferably 45 ° toward the center of the leading cylinder body so as to secure a gap for passage of coolant between them. The coolant to be passed smoothly passes through the coolant passage gap between each hemispherical leading bit, and the pilot head is mounted between each hemispherical succeeding bit of the main head and between each succeeding bit and the succeeding cylinder. Because the clearance for use is secured, the coolant that sprays from the discharge port and rises up the excavation hole smoothly rises between each hemispherical leading bit and between each hemispherical succeeding bit, further clogging such as pebbles and bedrock fragments certainly It shall extinguished, the temperature rise due to friction with the ground layer greatly reduces, and that there is an effect that it is possible to greatly increase the service life by preventing 熔損 and breakage of each bid.

    And, each of the leading bit integrated outer diameters is subject to excavation by means of an axial mechanism with an inclination angle of 45 ° toward the center of the downward direction with respect to the center line of the leading cylindrical body at each of three balanced positions around the circumference of the leading cylindrical body outlet. Attached to the leading hole diameter that is sufficiently smaller than the diameter of the hole, the tip pilot head provided with the lower part of the detaching mechanism at the upper end of the leading cylindrical body, and the three succeeding parts around the circumference of the subsequent cylindrical body A component that has a main head that is axially attached so that the integrated outer diameter of each subsequent bit matches the diameter of the target drilling hole by a shaft mechanism with an inclination angle of 45 ° toward the center toward the center downward with respect to the cylinder center line. The structure can be simplified by minimizing the number of points, and the size and weight can be reduced. Further, the advantages of excellent durability and high economic efficiency can be obtained.

    The lower part of the detaching mechanism at the upper end of the pilot head leading cylinder is either the same as the connecting part for the boring rod or the one with a separate adapter interposed, and the pilot head can be connected without using the main head. The one that can be directly connected to the boring rod enables drilling to reach the bedrock layer from the surface layer with the pilot head alone, enabling drilling holes with a smaller diameter more efficiently than when the main head is assembled. If the main head and pilot head are combined, a large-diameter excavation hole can be excavated, so two types of excavation can be performed with a single ground excavation attachment, and the pilot head alone After drilling the lead hole, the target drill hole is expanded and drilled by combining the main head and pilot head. Work can be realized, and can be made with increased dramatically the workability of the rock drilling by realization of versatile use.

    Each leading bit and each succeeding bit can be attached and detached so that each hemispherical outer periphery is chamfered in a tapered shape, and multiple chips are scattered and protruded uniformly at an appropriate interval in the hemispherical range and the tapered chamfering range. What is provided in reduce the frictional resistance applied to the outer periphery of the hemispherical shape, realize smoother excavation, replace the worn and damaged chips individually, always keep the performance of the parts high, The service life will be extended and it will become more economical.

    A star shape in which each pilot bit of the pilot head is pivotally attached to a sleeve-like support part or each arm part provided at the lower end of the lead cylinder, and / or each subsequent bit of the main head is provided around the circumference of the subsequent cylinder. By mounting on the support part or each arm part, the gap between each leading bit, the gap between each succeeding bit, and the gap between each cylinder, etc. are widened to block clogs such as pebbles and rock fragments. It can be prevented more reliably and smoother excavation work can be realized.

    According to the ground excavation method using the ground excavation attachment according to the present invention, the ground excavation attachment is suspended in a suspension device such as a crane, a rotation drive source, a coolant supply source, and the rotation drive source By connecting to the lower end of the boring rod that is rotationally driven, the cooling liquid can be controlled to be ejected from the discharge port through the boring rod, the subsequent cylinder, and the leading cylinder from the cooling liquid supply source. Drive the source, cut each pilot bit with a pilot bit at the desired location on the rock layer, drill down while drilling a leading hole with a diameter that is sufficiently smaller than the target drilling hole diameter, and center the rotation center of the ground excavation attachment. In addition, it is supported so that it can be stably guided to a desired location, and each subsequent bit of the main head that follows it cuts into the desired location of the bedrock layer, By controlling to drill the target drilling hole of the drilling hole diameter to the desired depth, during the process of the coolant passing through and rising from the discharge port to the leading hole and the target drilling hole, between each leading bit and each subsequent bit Ascending and discharging pebbles and rock debris without delay, the action to prevent rotation stoppage due to clogging can be greatly enhanced, and friction of each leading bit and each subsequent bit and overheating caused by it are prevented. In addition, it is possible to more reliably prevent the occurrence of melting or chipping, and the pilot head that excavates the lead hole stably supports the rotation center of the main head that subsequently expands the target excavation hole. The two-step excavation by the pilot head and main head makes a large-diameter hole at the desired position and posture with respect to the rock formation much more accurately, smoothly and quietly. That it is possible to excavate, it becomes exert a great effect which can not be obtained in the prior art.

    In addition, after supplying the coolant so as to be ejected from the discharge port only by the pilot head of the ground excavation attachment of the present invention, after excavating only the leading hole so as to reach the rock layer to the desired location on the surface layer, the main head and Using an attachment for ground excavation combined with a pilot head, while discharging coolant from the discharge port, the surface layer leading hole that has already been excavated is expanded to the target excavation hole diameter, and the rock layer has a large diameter By excavating the hole, it is possible to grasp the overall state of the ground to be excavated by excavating only with the pilot head at the initial stage of excavation, so in the work stage of excavating the target excavation hole with a large diameter It is possible to realize more stable excavation work, and the situation that construction is unexpectedly difficult and the construction period has to be extended Preventing, it becomes to achieve the Xiu the effect that it is possible to enable more deliberate and efficient construction.

    According to the earth retaining support method using the ground excavation attachment of the present invention, a pilot hole is used to excavate a leading hole in the ground layer of each support pile driving site surrounding the target earth retaining area, and the main head and the pilot head are combined. Using the ground excavation attachment, expand the target excavation hole of the target excavation hole diameter of the bedrock layer to the desired depth, pull up the relevant excavation attachment, and the lower end of each support pile is within the specified range. The soil retaining support that reaches the bedrock layer in the vicinity of buildings, etc., until now, by driving to reach the target excavation hole of the layer and installing a sheet pile wall between each support pile. It was very difficult to install a work, or it was impossible in many cases, and it was difficult to stop or stop the work. Overcoming major challenges, enabling accurate and quiet large-diameter rock excavation, greatly increasing the facility possibilities of retaining soil support, and enabling construction of retaining soil support in more diverse locations than before The big effect of becoming a thing can be acquired.

In implementing the present invention having the above-described configuration, the best or desirable mode will be described.
Prior to the subsequent main head, the pilot head drills a leading hole with a diameter that is sufficiently smaller than the target drilling hole diameter in the ground, and places the rotation axis of the main head with a larger diameter at a desired location. A leading cylinder that has a function of enabling stable support and guidance and having a diameter sufficiently smaller than the diameter of the target excavation hole and having a cooling liquid discharge port opened at the lower end of the cylinder passing through the cooling liquid supply pipe. Provide hemispherical lead bits facing each other so as to secure a gap for passage of coolant between them at a plurality of balanced locations around the periphery of the discharge outlet of the lead cylindrical body, and close to the center of the lead cylindrical body. A shaft mechanism with an inclination angle of 30 ° to 60 °, preferably 45 °, is attached so that the integrated outer diameter of each of the leading bits coincides with the diameter of the leading hole sufficiently smaller than the diameter of the target drilling hole. The lower part of the desorption mechanism must be provided at the upper end. The number of leading bits should be three or more. Preferably, as shown in the embodiments described later, the three are balanced with an opening angle of 120 ° around the leading cylinder discharge port. It should be arranged.

    The lower part of the detachment mechanism at the upper end of the pilot head leading cylinder body is either the same as the connecting part for the boring rod or the one with a separate adapter interposed, and the pilot head without using the main head Can be directly connected to the boring rod.

    The target excavation hole diameter is a hole diameter dimension targeted for excavation. For example, when excavation for driving a support pile is performed, the diameter is substantially equal to or slightly larger than the support pile diameter. In addition, when embeding traffic signs, traffic lights, signboards, foundation piles, and other pillars in the ground, the diameter should be approximately the same as the diameter of the buried part at the bottom of the target pillars. It is desirable to set.

    Prior to the main head excavating the target excavation hole, the pilot hole excavates the excavation position, and not only the pilot head but also the ground excavation attachment including the subsequent main head, and the boring rod The pilot head must be a hole that has been excavated in the ground.

    The leading cylindrical body supports each pilot bit of the pilot head so that it can be driven to rotate around a certain central axis, and a coolant supply path that opens a discharge port toward the lower end between the respective leading bits. The outer diameter is set to be sufficiently smaller than the target drilling hole diameter, the coolant supply pipe is vertically passed through, the coolant discharge port is opened at the bottom of the cylinder, and the top is removed. The lower part of the mechanism must be provided, and should be connectable to the lower part of the detachment mechanism at the lower end of the succeeding cylindrical body through the lower part of the detachment mechanism. A sleeve-like support portion or each arm portion for pivotally attaching each leading bit to the lower end may be provided.

    The leading bit has the function of giving excavation performance to the tip of the pilot head, reducing heating during excavation, and preventing clogging of pebbles and rock fragments and stopping rotation. It must be hemispherical facing each other so as to secure a gap for passage of coolant between the plurality of balanced locations around the circumference of the cylinder discharge port, and is closer to the center downward than the leading cylinder center line. It should be axially attached so that the integrated outer diameter of each leading bit matches the diameter of the leading hole sufficiently smaller than the target drilling hole diameter by a shaft mechanism having an inclination angle of 30 ° to 60 °, preferably 45 °. As shown in the embodiments described later, each leading bit and each subsequent bit described later chamfer the outer peripheral edge of each hemispherical shape in a tapered shape, and the hemispherical range and the tapered chamfering range are separated at appropriate intervals. Universal Provided to scattered-projection a plurality of chips, each chip, outer to that of the fixed type, can be made detachable replacement.

    The cooling liquid passage gap is supplied from the upper end of the leading cylinder, and each of the leading bits arranged so that the cooling liquid ejected from the discharge port toward the ground faces each other around the periphery of the leading cylinder discharge port. A function that enables smooth feeding through the gaps and prevents biting of pebbles and rock fragments in each hemispherical lead bit, overheating due to friction with them, and further seizing. It is preferable that the hemispherical ranges of the leading bits are set so as to face each other with an appropriate interval.

    The mounting posture of each leading bit with respect to the leading cylindrical body is in contact with the ground by rotation around the center line of the leading cylindrical body, and each leading bit that receives friction bears a function to be able to rotate around each shaft mechanism. Each hemispherical lead bit hemispherical range should be set at a suitable position where the centrifugal drift is parallel to the leading end of the leading cylinder center line, and when the leading end of the leading cylinder is seen from the front The posture and arrangement should be such that only the hemispherical range of each hemispherical lead bit facing the cooling liquid passage is located around the discharge port, and is closer to the center downward than the lead cylinder center line Further, it is assumed that the integrated outer diameter of each leading bit is axially attached to the leading hole diameter sufficiently smaller than the target drilling hole diameter by a shaft mechanism having an inclination angle of 30 ° to 60 °, preferably 45 °. good.

    The main head follows the drilling and leading of a leading hole having a diameter that is sufficiently smaller than the target drilling hole diameter at the ground location desired by the pilot head, and the diameter of the leading hole matches the target drilling hole diameter. The detachment mechanism upper part and the same cylinder, which share the function of digging so as to expand to the diameter, have a diameter smaller than the target digging hole diameter, and can connect the lower part of the detachment mechanism to the lower end of the cylinder passing through the coolant supply pipe A succeeding cylinder having a connecting part for a boring rod at the upper end is provided, and hemispherical succeeding bits facing each other so as to secure a space for mounting the pilot head are provided at the balanced positions around the circumference of the succeeding cylinder. The integrated outer diameter of each succeeding bit must be axially attached so as to coincide with the target drilling hole diameter by an axial mechanism with an inclination angle of 30 ° to 60 °, preferably 45 ° toward the center of the cylinder. Goodbye The number of subsequent bits should be three or more. For example, when there are three leading bits, it is preferable to provide three or four subsequent bits, as shown in the embodiments described later. The three subsequent bits may be arranged so as to balance each other with an opening angle of 120 ° so as to secure an upper portion of the desorption mechanism and a pilot head mounting gap at the lower end of the subsequent cylinder.

    The subsequent cylinder supports each subsequent bit of the main head so that it can be driven to rotate around a certain central axis, and also serves as a coolant supply path that passes between the surrounding subsequent bits. The dimension is set to be sufficiently smaller than the target drilling hole diameter, the coolant supply pipe is vertically passed, the connecting part for the boring rod is provided at the upper end of the cylinder, and the upper part of the desorption mechanism is provided at the lower end of the cylinder The lower end of the boring rod should be non-rotatably connected via the connecting part, and the upper part of the demounting mechanism should be non-rotatably connectable to the lower part of the leading cylinder body, As shown in the embodiments described later, a star-shaped support portion or each arm portion for pivotally attaching each subsequent bit can be provided at each of a plurality of balanced positions around the circumference.

    The succeeding bit has the function of giving excavation performance around the main head, reducing heating during excavation, and preventing rotation from stopping by biting pebbles or rock fragments. Each of a plurality of balanced portions around the outer peripheral wall of the body must be hemispherical facing each other so as to secure a gap for mounting the pilot head between them. The integrated outer diameter of each succeeding bit should be axially attached so as to coincide with the diameter of the target drilling hole by a shaft mechanism having an inclination angle of 60 ° to 60 °, preferably 45 °, as shown in the embodiments described later. Each hemispherical outer peripheral edge is chamfered in a tapered shape, and a plurality of chips are scattered and protruded uniformly at appropriate intervals in the hemispherical range and the tapered chamfered range. thing In addition, each leading bit and each succeeding bit can all be set to the same radius, either one of which has a larger radius than either of the other. In addition, the leading bits and / or the subsequent bits may be combined with each other having different radii.

    The pilot head mounting gap is located between each subsequent bit arranged around the succeeding cylinder when the lower part of the pilot head leading cylinder is attached to the upper part of the desorption mechanism at the lower end of the main head succeeding cylinder. A gap is secured so that the leading cylinder can be mounted without interference, and pebbles and rock fragments are not clogged between each succeeding bit and between each succeeding bit and the leading cylinder. Furthermore, the flow in which the cooling liquid ejected from the discharge port from the subsequent cylinder through the leading cylinder rises in the excavation hole is between each subsequent bit, between each subsequent bit and the leading cylinder, etc. It has a function that allows smooth flow and discharge through, and is set so that appropriate intervals are provided between the hemispherical ranges of each succeeding bit and between each hemispherical range and the succeeding cylinder or leading cylinder. Suppose Good.

    The mounting posture of each succeeding bit with respect to the succeeding cylinder bears the function of allowing each succeeding bit that is in contact with the ground by rotating around the center line of the succeeding cylinder and receiving friction to be rotatable around each shaft mechanism, Each hemispherical trailing bit hemispherical range from the central axis of the centrifugal cylinder must be set in a direction parallel to the distal end direction of the subsequent cylinder center line, and when the lower end of the subsequent cylinder is viewed from the bottom The position and arrangement should be such that only the hemispherical range of each hemispherical succeeding bit with the pilot head mounting gap facing each other around the outer periphery of the lower part of the desorption mechanism, and facing downward with respect to the center line of the succeeding cylinder It is preferable that the integrated outer diameter of each subsequent bit is attached so as to coincide with the diameter of the target excavation hole by an axis mechanism having an inclination angle of 30 ° to 60 °, preferably 45 ° toward the center.

    The detachable mechanism has a function that allows the upper end of the pilot head and the lower end of the main head to be concentric and non-rotatably connectable, and can be combined and connected so that each succeeding bit is arranged on the outer side of each leading bit. It must be strong enough to withstand the load during excavation by providing a lower part of the desorption mechanism at the upper end of the lead cylinder of the pilot head and an upper part of the desorption mechanism at the lower end of the connecting cylinder after the main head. The lower part of the detaching mechanism at the upper end of the pilot head is either the same as the connecting part for the boring rod or a separate adapter is interposed, and the pilot head is bored without going through the main head. It can be directly connected to the rod, and the attachment / detachment mechanism and connecting part penetrate through the mechanical screw type, joint, clamp, diametrical direction. It can be utilized as various such connecting pin.

    The ground excavation method using the ground excavation attachment of the present invention is such that when excavating the surface layer, the ground excavation attachment combining the main head and the pilot head is used from the beginning, and the rock excavation is performed as it is. In addition to being able to proceed with the work, first connect only the pilot head to the boring rod, drill a lead hole that reaches the surface layer or rock layer, then remove the pilot head from the boring rod extracted to the ground, and then remove the main head It is possible to proceed with the drilling of the target drilling hole of the desired drilling hole diameter that reaches the rock formation using the leading hole drilled earlier as a guide, incorporating a ground drilling attachment that combines the pilot head with the drilling rod is there.

    A crane or other suspension device can be a construction machine equipped with a crane, but when a heavy crawler-type construction machine cannot be used, such as when there is another building near the excavation target position. For example, it is desirable to use a wheel type, for example, a truck crane, as shown in the embodiments described later, and the rotational drive source includes the boring rod and the ground excavation attachment of the present invention. It must be a power source that can be driven to rotate with sufficient torque, and should preferably consist of an electric motor and transmission mechanism that can achieve quiet excavation. Use a hydraulic motor or engine depending on the surrounding conditions. The boring rod is longer than the drilling target depth of the target drilling hole and is strong enough to withstand the torque during drilling. The upper end is connected to the rotational drive source and the lower end is connectable to the ground excavation attachment according to the present invention, respectively, and the bottom excavation attachment connecting portion and / or the detaching mechanism are connected to the lower end. The lower part should be detachably connectable, and the coolant supply source can be pumped from the coolant tank mounted on the ground or in the vehicle by a pump, and can be forcibly supplied to the supply line through the appropriate position of the boring rod. As shown in the examples to be described later, a suitable place near the upper end of the boring rod is combined so that it passes vertically through the coolant tank, and it is supplied using the coolant pressure by gravity or a compressed air pressure using a pump or a compressor. It is possible to supply pressure to the pipeline, and the coolant can use water, such as tap water, rainwater, ground Water, various aqueous solution, muddy water and other, use and to drilling, such as the subsequent land use, it is possible to use the there is no hindrance to the natural environment cooling liquid.

The earth retaining support method using the ground excavation attachment according to the present invention was excavated to the bedrock layer using the ground excavation attachment combining the main head and the pilot head from the beginning, and reached the bedrock layer. In addition to being able to pull out the ground excavation attachment and drive a support pile into the target excavation hole, first, the ground layer or rock mass using a boring rod connected directly to the pilot head After drilling the leading hole to reach the layer, the target drilling hole is drilled by using the ground excavation attachment that combines the main head and pilot head to be guided to the leading hole to reach the rock layer. , Pull out the attachment for ground excavation and proceed to work to drive the support pile into the target excavation hole, Below that can be made to have so as to pass placed over the sheet pile wall between the supporting piles with examples representative of the present invention shown in the drawings, and specifically described for its structure.

The drawings show some typical embodiments embodying the technical idea of the ground excavation attachment, the excavation method using the same, and the earth retaining support method of the present invention.
It is a front view which shows the attachment for ground excavation. It is a top view which shows the attachment for ground excavation. It is a bottom view which shows the attachment for ground excavation. It is a front view which shows the attachment for ground excavation which decomposed | disassembled. It is a bottom view which shows a main head. It is a top view which shows a pilot head. It is a bottom view which shows a pilot head. It is a front view which shows the attachment for ground excavation which changed some dimensions and shapes. It is a front view which shows typically the state which excavates a leading hole in the ground by this invention. It is a front view which shows typically the state which excavates the object excavation hole in the ground by this invention. It is a front view which shows the state which the ground excavation attachment excavates. It is sectional drawing which shows the ground used as a pile facility object. It is sectional drawing which shows the attachment for ground excavation which excavates a target excavation hole. It is sectional drawing which shows the pile erected in the target excavation hole. It is sectional drawing which shows the ground used as the construction object of the earth retaining support method. It is sectional drawing which shows the attachment for ground excavation which excavates a target excavation hole. It is sectional drawing which shows the operation | work state which raises a pile in a target excavation hole. It is a top view which shows the object excavation hole excavated so that the earth retaining area may be enclosed. It is a top view which shows the completed earth retaining support. It is a top view which shows the ground which finished the removal work.

    As can be clearly understood from these drawings, the ground excavation attachment 1 according to the present invention includes a plurality of hemispherical leading bits 3 facing each other so as to secure a cooling liquid W passage gap S1 at the discharge port 22 of the leading cylinder 20. 3 and 3 with respect to the center line C of the leading cylindrical body 20 at an inclination angle β of 45 °, and a tip pilot head 2 provided with a detaching mechanism lower portion 60 at the upper end of the leading cylindrical body 20, and a cylindrical body 40 A plurality of hemispherical rears that are provided with a detaching mechanism upper part 61 at the lower end of the cylinder and a trailing cylinder 40 having a connecting portion 42 at the upper end, and confront each other so as to secure a pilot head 2 mounting gap S2 around the circumference of the subsequent cylinder 40. The bits 5, 5, and 5 are composed of the main head 4 that is pivotally attached to the center line C of the subsequent cylinder 40 at an inclination angle β of 45 °, and the attachment / detachment mechanism upper portion 61 cannot be rotated at the attachment / detachment mechanism lower portion 60. Connect each leading bit 3, 3, The upper outside is crocodile was assumed combination can be connected to each subsequent bit 5,5,5 are disposed, there is shown an example representative of the ground excavation attachment of the present invention.

    As shown in FIGS. 1 to 7, the ground excavation attachment 1 is composed of a combination of a pilot head 2 and a main head 3, and the pilot head 2 has a leading cylindrical body 20 that forms a shaft portion thereof, for example, a utility pole. When excavation is performed for the purpose of standing up (not shown), the diameter is set to be sufficiently smaller than the target excavation hole diameter D corresponding to the base end diameter of the target electric pole, and the coolant 20 is provided inside the cylindrical body 20. In addition to passing through the supply pipe 21, a coolant W discharge port 22 is opened at the lower end of the cylindrical body 20, and the leading cylinder 20 discharge port 22 is slightly expanded toward the tip. A hemispherical shape in which a sleeve-like support portion 23 is provided and confronted so as to secure a cooling liquid passage gap S1 between the three equilibrated locations around the support portion 23 at every angle α of 120 °. Leading bits 3, 3, and 3 in the leading cylindrical body 20 With respect to the core C, the shaft mechanisms 30, 30, and 30 having an inclination angle β of 45 ° toward the center toward the lower side make each leading bit 3, 3, 3 integrated outer diameter d sufficiently smaller than the target drilling hole diameter D. Attached so as to coincide with the leading hole diameter H1, and screwed and coupled to the upper end of the leading cylindrical body 20 by forward rotation during excavation work of the ground excavation attachment 1, and disengaged and detached by reverse rotation A detaching mechanism lower portion 60 composed of a possible screw portion is provided.

    The main head 4 has a diameter smaller than the target excavation hole diameter D corresponding to the base end diameter of the target electric pole when the subsequent cylinder 40 forming the shaft portion performs excavation, for example, for the purpose of standing the electric pole (not shown). In the same cylinder 40, the supply pipe 41 for the coolant W is vertically passed through the cylinder 40, and the ground excavation attachment 1 is excavated at the lower end of the cylinder 40 with respect to the desorption mechanism lower part 60. A demounting mechanism upper portion 61 comprising a screw portion that can be screwed / coupled by forward rotation during work and can be screwed / removed by reverse rotation, and a boring rod 73 (shown in FIG. 13) at the upper end of the cylindrical body 40. Each of the connecting portions 42 for connection is provided, and the outer peripheral wall of the succeeding cylindrical body 40 is slightly expanded from the three balanced points each having an angle α of 120 ° around the circumference toward the tip. Therefore, the tip of the succeeding cylinder 40 is slightly exceeded. In this way, the arm portions 43, 43, 43 are extended, and hemispherical subsequent bits 5, 5, 5 facing each other so as to secure the pilot head 2 mounting gap S2 at the tips of the respective arm portions 43, 43, 43, With respect to the center line C of the subsequent cylinder 40, the integrated outer diameter D of each subsequent bit 5, 5, 5 is set to the base end of the target power pole by the shaft mechanisms 50, 50, 50 having an inclination angle β of 45 ° toward the center downward. The shaft is attached so as to coincide with the target excavation hole diameter D corresponding to the diameter.

    The pilot head 2 leading bits 3, 3, 3 integrated outer diameter d of the ground excavation attachment 1 are diameters that can reliably transmit the direction of excavation of the rotary drive source 71 and the boring rod 73, such as Φ100 mm, Φ250 mm, Φ320 mm, etc. In addition, the integrated outer diameter D of the subsequent bits 5, 5, and 5 of the main head 4 is any one of the target excavation hole diameter D, for example, Φ400 mm, Φ420 mm, Φ450 mm, etc. For example, “d: Φ320 mm, D: Φ420 mm”, “d: Φ160 mm, D: Φ400 mm”, “d: Φ350 mm, D: Φ420 mm” can be used in combination.

    The pilot head 2 and the main head 4 are configured so that the detachable mechanism upper portion 61 is non-rotatably connected to the detachable mechanism lower portion 60, and the succeeding bits 5, 5, 5 on the outer side of the leading bits 3, 3, 3. The pilot head 2 leading cylindrical body 20 has a detachable mechanism lower portion 60 that is the same as the connecting portion 42 for the boring rod 73 (shown in FIG. 13). The pilot head 2 can be directly connected to the boring rod 73 without using the main head 4.

    As shown in FIGS. 1, 8, and 11, the vertical length L of the pilot head 2 and main head 4 of the ground excavation attachment 1, the leading bit 3, 3, 3 integrated outer diameter d, and the subsequent bit 5, 5 and 5 integrated outer diameter D, and the shape and dimensions of the sleeve-like support portion 23 and arm portions 43, 43, 43 can be appropriately changed. Subsequent bits 5, 5, 5 chamfer the outer peripheral edge of each hemispherical shape into a tapered shape, and a plurality of chips 33 are uniformly distributed at appropriate intervals into the hemispherical range 31, 51 and the tapered chamfered range 32, 52. , 53 are provided so as to be scattered and protruded, and has a detachable structure (not shown) such as a mounting screw that can be detachably replaced when worn.

(Operation / Effect of Example 1)
As shown in FIGS. 9 and 10, the ground excavation attachment 1 of the present invention having the configuration as described above is connected to the boring rod 73 by connecting only the pilot head 2 to the ground 8 with a leading hole diameter d. After excavating the hole H1, the drilling rod 73 is once pulled up to remove the pilot head 2, and the ground excavation attachment 1 in which the main head 4 and the pilot head 2 are combined is connected to the boring rod 73 to the leading hole H1. The drilling method of the present invention is carried out so as to stabilize the rotation center of the main head 4 by driving the pilot head 2 along the target head and accurately drill the target drilling hole H2 having the target drilling hole diameter D at a desired position. can do.

    Further, as shown in FIGS. 11 and 13, the ground excavation attachment 1 of the present invention is a rotary drive source such as an electric motor or a hydraulic motor suspended from a suspension device such as a crane 70 mounted on a truck crane 7. 71, a cooling water supply source 72 such as a cooling water tank, a discharge pipe of a cooling water pump capable of pumping cooling water stored in a water tank on the ground, and a boring rod which is under the rotation driving source 71 and is driven to rotate. When the drilling is performed on the ground 8 by connecting to the lower end of 73, as indicated by the white arrow in FIG. 11 from the pilot head 2 discharge port 22 as the boring rod 73 and the ground excavation attachment 1 are driven to rotate. The target excavation from the leading hole H1 while spraying the cooling water W and mixing with crushed stones and excavated soil by the rotation of the ground excavation attachment 1 It smoothly flows and rises through the coolant passage gap S1, between the leading bits 3, 3, and 3, between the pilot head 2 mounting gap S2, and between the following bits 5, 5, and 5, and the leading bit is raised by the ascending process. 3. Prevent clogging of 3, 3, 3 and subsequent bits 5, 5, 5 and forcibly cool to prevent damage due to overheating, avoiding rotation stop and realizing smooth excavation .

    As shown in FIGS. 9 to 14, the ground excavation attachment 1 sets the subsequent bit integrated outer diameter D to 100 to 400 mm, and implements the target excavation near the building 82 by performing the excavation method of the present invention. When installing the utility pole 9 having a hole diameter D (100 to 400 mm), the upper end of the boring rod 73 is placed under the rotary shaft of the rotary drive source 71 including the electric motor and the speed reducer suspended from the suspension device of the truck crane 7. In a suitable position near the upper end of the boring rod 73, suspended and connected, a cooling liquid tank and an in-vehicle water tank, a water supply pump having a filtration function, an air pump, and a leading hole H1 are installed so that the boring rod 73 passes vertically. Cooling with a feed water pump (both not shown) that collects the circulating coolant from the reservoir drilled down at the opening of the target excavation hole H2 and circulates it into the water tank A supply source 72 can be used, and only the pilot head 2 of the ground excavation attachment 1 is connected to the lower end of the boring rod 73, and the coolant supply source 72 passes through the supply pipes 41 and 21 in the boring rod 73. While supplying the coolant W so as to be ejected from the discharge port 22, after excavating only the leading hole H1 so as to reach the rock layer 81 at a desired location in the surface layer 80, the boring rod 73 and the pilot head 2 are once pulled up, The ground excavation attachment 1 combining the head 4 and the pilot head 2 is connected to the lower end of the boring rod 73, and again the ground layer 80 leading hole H1 that has been excavated while the coolant W is ejected from the discharge port 22 again. The pilot head 2 that reached the bedrock layer 81 and the leading bits 3, 3, and 3 The leading hole H1 having a sufficiently small leading hole diameter d is dug down to support the rotation center of the entire ground excavation attachment 1 at the desired location so that it can be stably guided. Each succeeding bit 5, 5, 5 of the head 4 can be cut into a desired location of the rock layer 81 to excavate the target excavation hole H 2 having the desired excavation hole diameter D to a desired depth.

Further, as shown in FIGS. 11 and 13, during excavation, the cooling liquid W supplied from the cooling liquid supply source 72 is jetted from the pilot head 2 discharge port 22 to the deepest portion of the leading hole H1 to cool the excavation. Each leading bit 3, 3, 3 and each succeeding bit 5, 5, 5 are cooled through gaps such as the liquid passing gap S1 and the pilot head 2 mounting gap S2, to prevent clogging or overheating, etc. Smooth and quiet excavation work can be realized, and the coolant W that has risen to the opening edge of the target excavation hole H2 overflows into a reservoir (not shown), and a water supply pump (not shown) cools the reservoir. The liquid W is sucked up and circulated in the on-board water tank, and the feed water pump is filtered and pumped to the cooling liquid supply source (cooling liquid tank) 72, so that the cooling liquid W can be circulated and used effectively without consuming a large amount. As a thing .
As shown in FIG. 13 and FIG. 14, the base end of the diameter D of the utility pole 9 is predetermined in the excavated target excavation hole H2 without causing excessive vibration or noise to the adjacent building 82. The range can be accurately placed to reach the bedrock layer 81.

    Further, as shown in FIGS. 9 to 11 and 15 to 20, the ground excavation attachment 1 is provided with an existing buried object (a demolished building) in the vicinity of the building 82 by performing the earth retaining support method of the present invention. When the support 90 is constructed around 84 and the buried object 84 is to be removed safely, first, the support pile 91 surrounding the target soil retaining area 83 is drilled on the surface layer 80 of each of the places where the support piles 91 are driven. Only the pilot head 2 is connected to the rod 73 and the coolant W is supplied so as to be ejected from the discharge port 22, while the leading hole diameter d is sufficiently smaller than the target excavation hole H 2 substantially matching the support pile 91 diameter d. After excavating the hole H1, the ground excavation attachment 1 combining the main head 4 and the pilot head 2 is connected to the boring rod 73 and ejected from the discharge port 22. While supplying the cooling liquid W, the drilling hole H1 of the surface layer 80 is expanded to a target drilling hole diameter D that substantially matches the outer peripheral diameter D of the support pile 91, and during the excavation, the bedrock layer The pilot head 2 that has reached 81 The center of rotation of the ground excavation attachment 1 is dug down while drilling a leading hole H1 having a leading hole diameter d sufficiently smaller than the target drilling hole diameter D by each leading bit 3, 3, 3 C is supported so as to be stably guided to the desired location, and the pilot head 2 leads bits 3, 3 and 3 to the main head 4 and subsequent bits 5.5.5 to the desired location of the bedrock layer 81. After cutting the target excavation hole H2 having the desired target excavation hole diameter D to the desired depth, the ground excavation attachment 1 is pulled up, and the lower end of the support pile 91 has a predetermined range of the target excavation hole in the rock formation 81. Reach H2 After performing the driving operation of the support piles 91 for each support pile 91 driving portion surrounding the target soil retaining region 83, as shown in FIG. 19, the support piles 91, 91, ...... It is possible to bury the sheet pile walls 92, 92,.

    Furthermore, the ground excavation attachment 1 suspended from the boring rod 73 can be excavated in the range of the radius of rotation of the crane 70 to the crane 70 (for example, about 7 m). By stopping the truck crane 7 at a position sufficiently away from the building 82 and remotely constructing it, it is possible to minimize the effects of vibration and noise on the building 82 and its users. The crane 70 can be extended and remotely excavated so as to bypass the underground buried object and the spring water location.

    19 and 20, after the support work 90 is completed, the buried object 84 is safely removed, and the holes left by the removal are backfilled, and the support piles 91, 91,. The sheet pile walls 92, 92,... Are removed, the holes are backfilled, the ground is leveled, and the ground is restored.

(Conclusion)
As described above, the ground excavation attachment of the present invention, the excavation method using the excavation method, and the earth retaining method are capable of achieving the intended purpose uniformly by the new configuration, and can be easily manufactured. Compared to conventional drilling equipment technology, it is possible to drill a large-diameter hole quietly and remarkably efficiently in the rock, greatly increasing the durability of the ground excavation attachment, making it lighter and cheaper The construction industry wants to save money and improve work efficiency because it can be much more economical and can greatly improve rock drilling work by eliminating the need for crawler-type construction machinery. Of course, until now, it is impossible for various reasons such as generation of vibration and noise, too close to neighboring buildings, and heavy machinery not being able to enter underground facilities or springs It has been highly evaluated by the real estate industry and ordinary households who want to construct large-diameter holes in the rock mass, and various civil engineering works that involve such rock excavation. Expected to be.

1 Attachment for ground excavation 2 Pilot head
20 Leading cylinder
21 Same supply pipeline
22 Same outlet
23 Same sleeve support (or arm)
C Same center line 3 Leading bit
30 Coaxial mechanism
31 Hemispherical range
32 Tapered chamfer range
33 Same chip
S1 Same coolant passage gap
α Same leading bit opening angle
β Inclination angle of coaxial mechanism 4 Main head
40 Following cylinder
41 Same supply line
42 Same connection part (or separate adapter)
43 Same arm part 5 Successive bit
50 Coaxial mechanism
51 Hemispherical range
52 Tapered chamfer range
53 Same chip
S2 Same pilot head mounting gap 6 Desorption mechanism
60 Lower part of the desorption mechanism
61 Desorption mechanism upper part L Vertical dimension of attachment main part for ground excavation H1 Leading hole
d Leading hole diameter (leading bit integrated outer diameter)
H2 drilling holes
D Same drilling hole diameter (outer diameter of subsequent bit integrated)
7 Truck (Construction machinery)
70 Crane
71 Same rotational drive source
72 Same Coolant supply source
W Coolant
73 Same boring rod 8 Ground
80 Surface layer
81 The bedrock layer
82 The same building
83 Same retaining area
84 The buried object 9 Telephone pole
90 Same support work
91 Same support pile
92 The sheet pile wall

However, the excavator shown in the former Patent Document 1 (1) is very effective when excavating a buried hole having a small diameter of 100 to 150 mm to a depth of 10 to 30 m. However, when drilling a larger hole, for example, with a diameter of 450 mm, it is indispensable to expand the auger head, and the latter patent document 1 (2), which was developed as a solution to these problems, The cutter head with multiple conical cutters around it was very effective for excavating large diameters in soft ground, but the gap between the center shaft and each conical cutter was narrow, and each Since the contact area of the cone cutter with the formation is large, when excavating hard ground such as the bedrock layer, pebbles and rock fragments may be bitten into the gap, and each cone cutter And the like or overheating caused the Kosunetsu becomes difficult to obtain a smooth rotation, it was found that it becomes impossible drilling.
(1) Japanese Patent No. 5129583 (2) Japanese Patent Laid-Open No. 2011-236560

Claims (9)

    A leading cylinder having a coolant outlet at the lower end of the cylinder that is sufficiently smaller than the target drilling hole diameter and vertically running through the coolant supply pipe is provided, and a coolant passage gap is provided at the leading cylinder outlet. A plurality of hemispherical leading bits facing each other to secure a predetermined angle are attached to the center line of the leading cylindrical body at an inclination angle of 30 ° to 60 °, preferably 45 ° toward the lower center, and the upper end of the leading cylindrical body The pilot pilot head with the lower part of the attachment / detachment mechanism and the upper part of the attachment / detachment mechanism at the lower end of the cylinder and the subsequent cylinder with the connecting part at the upper end are secured around the circumference of the subsequent cylinder. A plurality of hemispherical succeeding bits opposed to each other, and a main head axially attached at an inclination angle of 30 ° to 60 °, preferably 45 ° with respect to the center line of the succeeding cylinder. The upper part of the attachment / detachment mechanism cannot be rotated at the lower part of the mechanism. Together look, things that can be connected to the ground excavation for the attachment     A plurality of pipes that are sufficiently smaller than the diameter of the target excavation hole and that have a leading cylinder body that opens a cooling liquid discharge port at the lower end of the cylindrical body that passes through the supply pipe for cooling liquid, and that are balanced around the periphery of the leading cylinder discharge port A hemispherical lead bit facing each other so as to secure a gap for passage of coolant between them is inclined at an angle of 30 ° to 60 °, preferably 45 ° toward the center downward with respect to the center line of the lead cylinder. A tip pilot head that is attached to the shaft so that the integrated outer diameter of each of the leading bits matches the diameter of the leading hole sufficiently smaller than the target drilling hole diameter, and the lower part of the leading cylindrical body is provided with a detaching mechanism lower part, Subsequent with a diameter smaller than the target excavation hole diameter, with the upper part of the detachable mechanism connecting the lower part of the detachable mechanism at the lower end of the cylinder vertically passing through the coolant supply pipe, and the connecting part for the boring rod at the upper end of the cylinder Provide a cylinder and balance the circumference of the following cylinder A hemispherical succeeding bit facing each other at a plurality of locations so as to secure the pilot head mounting gap has an inclination angle of 30 ° to 60 °, preferably 45 ° toward the center downward with respect to the center line of the succeeding cylinder. The integrated outer diameter of each succeeding bit by the shaft mechanism is composed of a main head that is attached so as to match the diameter of the target excavation hole, and the upper part of the attachment / detachment mechanism is non-rotatably connected to the lower part of the attachment / detachment mechanism. An attachment for ground excavation characterized in that it can be combined and connected so that each succeeding bit is arranged.     A leading cylinder with a coolant outlet is provided at the lower end of the cylinder that is sufficiently smaller than the target drilling hole diameter and passes through the coolant supply pipe, and the circumference around the leading cylinder outlet is balanced. Each hemispherical lead bit facing each other so as to secure a gap for passage of coolant between the respective points is provided by a shaft mechanism having an inclination angle of 45 ° toward the center downward with respect to the lead cylindrical body center line. Mount the bit so that the integrated outer diameter matches the leading hole diameter that is sufficiently smaller than the target drilling hole diameter, and the tip pilot head with the lower part of the desorption mechanism at the upper end of the leading cylindrical body, and the smaller diameter than the target drilling hole diameter The lower end of the cylinder passing through the coolant supply pipe is provided with an upper part of the detachable mechanism to which the lower part of the detachable mechanism can be connected, and a subsequent cylinder having a connecting part for a boring rod at the upper end of the cylinder. In each of the three locations around the cylinder that are in equilibrium, the pilot The integrated outer diameter of each succeeding bit is subject to excavation by a shaft mechanism in which hemispherical succeeding bits facing each other so as to secure a gap for mounting the head are inclined at 45 ° toward the center downward from the center line of the succeeding cylinder. It consists of a main head that is axially attached to match the hole diameter. The upper part of the attachment / detachment mechanism is non-rotatably connected to the lower part of the attachment / detachment mechanism. An attachment for ground excavation, characterized by its     The lower part of the detachment mechanism at the upper end of the pilot head leading cylinder body is either the same as the connecting part for the boring rod or the one with a separate adapter interposed, and the pilot head without using the main head The attachment for ground excavation as described in any one of Claim 1 thru | or 3 which becomes what can be directly connected to a boring rod.     Each leading bit and each succeeding bit chamfer the outer peripheral edge of each hemisphere in a tapered shape so that a plurality of chips are scattered and protruded evenly at appropriate intervals in the hemispherical range and the tapered chamfering range. The ground excavation attachment according to any one of claims 1 to 4, wherein the attachment is detachable.     A star shape in which each pilot bit of the pilot head is pivotally attached to a sleeve-like support part or each arm part provided at the lower end of the lead cylinder, and / or each subsequent bit of the main head is provided around the circumference of the subsequent cylinder. The ground excavation attachment according to any one of claims 1 to 5, wherein the ground excavation attachment is configured to be pivotally attached to a support portion or each arm portion.     6. A rotary drive source suspended from a suspension device such as a crane, a coolant supply source, and a boring for rotationally driving the attachment for ground excavation according to claim 1 under the rotary drive source. Connected to the lower end of the rod, while supplying cooling liquid to be ejected from the discharge port from the boring rod through the succeeding cylinder and the leading cylinder, the boring rod and the ground excavation attachment are rotated and driven by each leading bit of the pilot head. Cut to the desired location of the rock layer and drill down while drilling a leading hole with a diameter sufficiently smaller than the target drilling hole diameter to support the center of rotation of the ground excavation attachment to the desired location so that it can be stably guided In addition, each subsequent bit of the main head following each pilot bit of the pilot head cuts into a desired portion of the rock layer, and the desired target is excavated. Target drill hole having a hole diameter was made so as to drill to the desired depth, claims 1 to 6 or drilling method of the ground using the ground excavation attachment of one claim.     The ground according to any one of claims 1 to 5, at a lower end of a rotary drive source suspended from a suspension device such as a crane, a coolant supply source, and a boring rod under the rotary drive source. Only the pilot head of the excavation attachment is connected, and the coolant is supplied from the discharge port, and after drilling only the leading hole to reach the rock layer to the desired location on the surface layer, The ground drilling attachment according to any one of claims 1 to 5 comprising a main head and a pilot head is connected, and the ground layer leading hole previously drilled is supplied while supplying a cooling liquid to be ejected from the discharge port. Expand the drilling to the target drilling hole diameter, and make a pilot hole with a pilot hole diameter sufficiently smaller than the target drilling hole diameter with each pilot bit leading to the rock layer. Drilling down and supporting the center of rotation of the ground excavation attachment so that it can be stably guided to the desired location, each main head subsequent bit following each pilot bit leading to each pilot head cut into a desired location on the rock layer, The ground excavation method using the ground excavation attachment according to any one of claims 1 to 6, wherein a target excavation hole having a desired target excavation hole diameter is excavated to a desired depth.     A pilot hole is used to drill a leading hole with a diameter sufficiently smaller than the target drilling hole, which approximately matches the diameter of the supporting pile, using the pilot head, and then to the leading hole on the ground layer. 2. A rotary drive source suspended from a suspension device such as a crane, a coolant supply source, and a lower end of a boring rod that is rotationally driven under the rotary drive source, and comprises a main head and a pilot head. The ground excavation attachment according to any one of 5 to 5 is connected, and the coolant is supplied to be ejected from the discharge port, and the surface layer leading hole that has already been excavated is expanded to be the target excavation hole diameter. The pilot bit that reached the bedrock layer is drilled down with a leading hole having a diameter that is sufficiently smaller than the target drilling hole diameter to reach the center of rotation of the ground excavation attachment. The pilot bit is supported so that it can be stably guided to the desired location, and each subsequent bit of the main head following each pilot bit of the pilot head cuts into the desired location of the rock layer to reach the desired depth of the desired drilling hole diameter to the desired depth. After excavation, raise the attachment for ground excavation, drive the lower end of each support pile so that the predetermined range reaches the target excavation hole of the bedrock layer, and install the sheet pile wall between each support pile A soil retaining support method using the ground excavation attachment according to any one of claims 1 to 6.

Images