JP7257891B2 - Method for forming a recess in an excavable object - Google Patents

Description

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to reliably and appropriately cut out blocks from an excavable object such as a bedrock or a concrete body from the outside toward the inner part in the depth direction. First, it relates to a method of forming recesses in an excavable object that can efficiently form recesses.

Techniques that can be used to excavate a bedrock or the like to form a recess are disclosed in Patent Documents 1 to 3, for example. In the "excavation method" of Patent Document 1, cylinders are arranged substantially parallel, and a part or all of them are placed on a sliding plate and inserted into a hole pre-drilled in bedrock or the like, and pressure is applied to the cylinder to apply pressure to the bedrock. etc. are crushed and excavated. At that time, a cylinder for pushing a wedge into the bedrock is installed at the same time for excavation, or a slit is cut in advance with a water jet or the like in the hole for excavation. Patent Literature 1 was intended to handle bedrock blocks by applying it to bedrock or the like surrounded by free surfaces.

The method for crushing rocks, etc., of Patent Document 2 is to drill a plurality of holes in a rock or the like, insert an elastic member into some of the plurality of holes, and insert an elastic member that expands with a liquid supplied to the inside. , a wedge driven by a fluid cylinder is inserted into another part of the plurality of holes, and a pressurized fluid is supplied to the elastic member and the fluid cylinder at the same time so that rocks and the like are pushed by the elastic member and the wedge. While crushing, the wedges are used to hold the gaps between the crushed rocks and the like.

In the "tunnel excavation method using a rock splitting device" of Patent Document 3, a horizontal slit hole and a tunnel outer peripheral slit hole are drilled parallel to the tunnel excavation axis, and a plurality of rock splitting holes are drilled parallel to the horizontal slit hole. Then, a crushing device using an elastic expansion body is inserted into each of the holes, and a hydraulic pressure generator connected to the device is controlled to generate cracks in the rock and create a gap between the rock splitting hole and the crushing device. , to facilitate removal of the hydraulic pressure generator.

Full specification of Japanese Utility Model Laid-Open No. 61-202583 Japanese Patent Publication No. 4-28080 JP-A-7-317489

In any of the background arts, a crushing device or the like capable of crushing the bedrock or the like is provided in each of a plurality of holes formed side by side at intervals in the bedrock or the like, and cracks are generated from the holes by the crushing devices or the like. , bedrock, etc. are crushed so that excavation can be carried out.

When considering the application of Patent Documents 2 and 3, except for Patent Document 1, which assumes that there is a free surface, when forming a recess from the outside of a bedrock or the like toward the inner depths in the depth direction, it is found that the The cracks that form do not necessarily go to the adjacent holes, that is, it is not always possible to form a series of cracks connecting the holes and block the bedrock. However, there is a problem that it requires a work of crushing with a breaker or the like, requiring a great deal of time and effort.

In order to create a series of cracks connecting the holes so that the bedrock etc. can be blocked and a recess can be formed, a large number of holes are densely excavated so that the intervals are narrowed, and these holes are filled with cracks. On the other hand, it is necessary to install and operate a large number of crushing devices, etc., and there is a problem that excavation work and crushing work require a great deal of time and effort.

The present invention has been invented in view of the above-mentioned conventional problems, and is intended to reliably and appropriately cut out blocks from the outside toward the inner depths in the depth direction from excavable objects such as rocks and concrete bodies. To provide a recess forming method for an excavable object capable of efficiently forming recesses.

In the method for forming a recess in an excavable object according to the present invention, a recess is formed in an excavable object such as a bedrock or a concrete body by cutting out a block from the outside toward the inner depth in the depth direction. from the outside to the inside of the object, excavating a contour groove with the contour of the recess and from the outside of the object inside the object surrounded by the contour of the recess. Work is performed to excavate a dividing groove that divides each of the blocks to be cut out so as to be connected to the contour groove toward the inner depth, so that the cut out block is connected to the object only on the inner depth side. and installing a rock splitting device that applies a spreading force to widen the groove width in the dividing grooves, and breaks the block, whose inner and inner sides are connected to the object, from the object by the rock splitting device. and a recess forming step of removing the block broken from the object from the object and forming the recess in the object, wherein the rock breaking device is installed. The other partitioning groove adjacent to the partitioning groove is provided with a padding for obtaining a reaction force against the expanding force of the rock splitting device.

The contour groove adjacent to the dividing groove in which the rock breaking device is installed is provided with a padding for obtaining a reaction force against the spreading force of the rock breaking device.

The dividing grooves are formed in the object at intervals, and the dimensions of the intervals are set so as to gradually increase in the order of breaking the blocks.

The rock splitting device is installed in the contour groove to apply a widening force to widen the groove width, and the rock splitting device breaks the block, which is connected to the object on the inner side, from the object by the rock splitting device. It is characterized by including steps.

The excavation dimension of the contour ditch or the dividing ditch is at least twice the length of the rock breaking device installed in the ditch.
The stuffing is provided continuously to another dividing groove that is adjacent to the dividing groove in which the rock breaking device is installed, and to another dividing groove that is adjacent to the dividing groove with another block interposed therebetween. do.

In the method for forming a recess in an excavable object according to the present invention, a block can be reliably and appropriately applied to an excavable object such as a bedrock or a concrete body from the outside toward the inner depth in the depth direction. can be cut out, and the recesses can be formed efficiently. More specifically, other dividing grooves adjacent to the dividing groove in which the rock breaking device is installed are provided with fillings for obtaining a reaction force against the expanding force of the rock breaking device, so that the block to be broken can be broken accurately. Therefore, it is possible to avoid the occurrence of an unintended situation and the breakage of the block on the supporting side, which hinders the work.

1 is a perspective view showing an example of a recess forming portion to which a method for forming a recess in an excavable object according to the present invention is applied; FIG. FIG. 4 is an explanatory diagram of a groove forming step in a preferred embodiment of the method for forming recesses in an excavable object according to the present invention; In FIG. 2, it is a cross-sectional view taken along the line AA. FIG. 3 is an explanatory diagram illustrating an example of a drilling device used in the groove forming step shown in FIG. 2; FIG. 5 is an enlarged view of a main portion of contour grooves, division grooves, and installation holes formed by the drilling apparatus shown in FIG. 4 ; FIG. 5 is an explanatory diagram illustrating how a drilling bit is attached to the drilling bit of the drilling apparatus shown in FIG. 4 ; FIG. 4 is an explanatory diagram of a block breaking step in a preferred embodiment of the method for forming recesses in an excavable object according to the present invention; FIG. 8 is an explanatory diagram illustrating an example of a rock breaking device used in the block breaking step shown in FIG. 7; 7. It is a cross-sectional view taken along the line BB in FIG. FIG. 4 is an explanatory diagram of a recess forming step in a preferred embodiment of the method for forming recesses in an excavable object according to the present invention; 11 is a cross-sectional view showing a recess formed in the object by the recess forming step shown in FIG. 10; FIG.

A preferred embodiment of the method for forming recesses in an excavable object according to the present invention will now be described in detail with reference to the accompanying drawings. 1 to 11 sequentially show the procedure of the method for forming recesses in an excavable object according to the present embodiment.

As shown in FIG. 1, the method of forming a recess according to the present embodiment involves forming an object 1 on a plane extending in the front-rear and left-right directions of an object 1 that can be excavated, such as a bedrock or a concrete body, such as a floor surface 1a. 10 and 11) is formed in a desired contour shape from the outside of the .

In the method for forming recesses in an excavable object according to the present embodiment, recesses 2 are formed by cutting out blocks 3 from an object 1 .

As shown in FIGS. 2 and 3, first, a groove forming step is performed to form narrow slot-shaped grooves P and Q on the floor surface 1a of the object 1 from the outside. Two types of grooves P and Q are formed.

One groove P is a contour groove P formed by the contour shape X (see FIG. 1) of the recess 2 by excavating vertically in the depth direction from the outside of the object 1 toward the inner depths. be.

The contour groove P is formed continuously along the contour shape X of the recess 2 without interruption. By forming the contour groove P, it is possible to prevent an unexpected crack that may occur in the object 1 from spreading to the surroundings.

Another groove Q is excavated vertically in the depth direction from the outside of the object 1 surrounded by the contour shape X (contour groove P) of the recess 2 toward the inner depths, A plurality of dividing grooves Q divide the inside of the outline shape X into individual blocks 3 to be cut out.

The dividing grooves Q are formed, for example, in the front-rear direction and in the left-right direction at intervals in each of the straight lines, and are formed so as to connect the starting end and the end end to the contour groove P. As shown in FIG. The dividing groove Q is not limited to the front-rear direction and the left-right direction, and may be formed in other directions, or may be formed in a curved shape.

In the illustrated example, the dividing grooves Q are formed in a crossing grid pattern in the range surrounded by the contour grooves P, two in the front and rear longitudinal direction and three in the left and right horizontal directions.

Either of the contour groove P and the dividing groove Q may be formed first. If the contour groove P is formed in advance, the edge cutting by the contour groove P can prevent the vibration generated when excavating the dividing groove Q from propagating to the object 1 .

The size of the block 3 to be cut out is defined by the size surrounded by the dividing grooves Q or by the dividing groove Q and the contour groove P. As shown in FIG. In the illustrated example, 12 blocks 3 are cut out in three rows in the horizontal direction and four rows in the vertical direction, with a size corresponding to the interval dimension of the dividing grooves Q. FIG.

As shown in FIG. 3, the contour grooves P and the plurality of dividing grooves Q are formed with substantially the same excavation dimension in the depth direction from the floor surface 1a.

All the blocks 3 surrounded by the contour grooves P and the partition grooves Q and defined in size are in the form of quadrangular prisms in a state in which only the inner depth side 3a thereof in the depth direction is connected to the object 1. be.

Both the contour grooves P and the dividing grooves Q formed in the groove forming process are formed using a drilling device 5 that drills holes 4 in the object 1 .

As shown in FIG. 4, this drilling device 5 is provided with a plurality of drilling bits 6, at least two or more, arranged side by side, and holes 5 drilled and formed are adjacent to each other in one drilling operation. A series of continuous holes are formed between the mating ones.

4A is a side view of the drilling device 5, and FIG. 4B is a plan view of continuous holes formed by the drilling device 5. FIG. The figure shows an example of a drilling device 5 with two drilling bits 6 for drilling two holes 4 simultaneously.

As an example of this type of drilling device 5, “Slot Star” (trade name) manufactured by Okumura Corporation is known.

In the "Slot Star", a guide 7 is inserted into a pre-formed pilot hole, and two rods 8 each equipped with a drilling bit 6 are simultaneously reciprocated by a drifter in the front-rear direction. The holes 4 are drilled and formed simultaneously in a state where they are connected to each other.

Thereafter, by inserting the guide 7 into the drilled hole 4 and similarly driving the rod 8 with the drifter, two subsequent holes 4 are formed in a connected state.

By repeating this operation, as shown in FIG. 5, continuous continuous holes, that is, narrow slot-shaped contour grooves P and partition grooves Q whose groove width dimension is approximately equal to the hole diameter d of the hole 4 are formed. It has become so.

It goes without saying that the drilling device 5 may have a structure having a plurality of drilling bits 6 of three or more so that a plurality of holes 4 of three or more can be drilled at the same time.

In the groove forming step, as shown in FIGS. 2 and 5, the dividing grooves Q are provided with holes 4 so that a rock breaking device 9, which will be described later, can be installed, particularly a rock breaking device 9 with high output and high rock breaking performance. The installation hole 10 having a hole diameter D larger than the hole diameter d (substantially the groove width dimension of the dividing groove Q) is formed.

In the illustrated example, the installation holes 10 are provided in the dividing grooves Q formed in the left and right lateral directions. However, in order to efficiently proceed with the block breaking process using the rock splitting device 9, the installation holes 10 are provided at suitable locations in the front and rear vertical dividing grooves Q and contour grooves P, as required. You may make it provide.

The above-described drilling device 5 shown in FIG. 4 has at least one of the drilling bits 6 provided with a hole ( A drilling bit 11 capable of drilling an installation hole 10) is detachably attached.

As shown in FIGS. 2 and 5, the drilling device 5 uses the drilling bit 11 to simultaneously drill the hole 4 (form the contour groove P and the dividing groove Q) with the adjacent drilling bit 6. That is, the installation holes 10 are formed at an appropriate timing during the formation of the contour grooves P and the dividing grooves Q. As shown in FIG. The installation holes 10 may be collectively formed after the formation of the contour grooves P and the partition grooves Q is completed.

After the formation of the installation hole 10 is completed, the drilling bit 11 is removed from the drilling bit 6, and drilling of the hole 4 (formation of the contour groove P and the dividing groove Q) is continued.

The dividing grooves Q for dividing the blocks 3 to be broken from the object 1 by the rock splitting device 9 are formed in the object 1 at intervals as described above, and the size of this interval determines how the blocks 3 are to be broken. It is set so that it becomes gradually larger in order.

In the example shown in FIGS. 2 and 3, the interval dimension (interval dimension in the longitudinal direction: L, L1<L2<L3<L4) is widened from the front side in the front-rear direction toward the rear side, and from the left side in the left-right direction to the right side. The space dimension (horizontal direction space dimension: W, W1<W2<W3) is widened toward the front left corner block, and the block at the rear right corner is the largest.

Each block 3 is connected to the target object 1 only on the inner side 3a thereof, and the bonding strength between the block 3 and the target object 1 is large in terms of size (bonding area) alone. is larger than block 3, which is smaller.

By making the bonding strength of the blocks 3 to the object 1 different in this way, when the blocks 3 are broken by the rock breaking device 9, one block 3 (large block) is used as a supporting side for receiving force, and the other block 3 is used as a supporting side for receiving force. A breaking force can be effectively applied to the block 3 (small block).

After the contour grooves P and the dividing grooves Q are formed by the groove forming process, the block breaking process of breaking all of the blocks 3 from the object 1 is performed.

In the block breaking step, a rock breaking device 9 is installed in the dividing groove Q, specifically in the installation hole 10 as shown in FIG. be done.

It is preferable that the rock splitting device 9 has a long dimension in the depth direction of the dividing grooves Q, and can widen the groove width over a predetermined long distance.

As an example of this type of rock splitting device 9, there is known a “Hydraulic Rock Splitter Rock Splitter” (trade name) manufactured by Chubu Rock Drill Service Co., Ltd.

As shown in FIG. 8, the "rock splitter", which is an example of the rock splitting device 9, has a rod-shaped cylinder 13 into which hydraulic pressure is introduced from a hydraulic pump 12 in the length direction (the depth direction of the dividing groove Q). A plurality of pistons 14 driven to protrude from the cylinder 13 by hydraulic pressure are arranged in the length direction of the cylinder 13, the cylinder 13 is inserted into the rock splitting target site, and the piston 14 is protruded from the cylinder 13, thereby causing cracks in the rock splitting target site. It is designed to let

FIG. 8A is a perspective view of the rock splitting device 9 (rock splitter), and FIG. 8B is a side view showing the projecting operation of the piston 14 of the rock splitting device 9 (rock splitter).

In the block breaking process of the present embodiment, as described above, among the blocks 3 that are adjacent to each other in the front, rear, left, and right via the dividing groove Q, the larger block 3 is used as the supporting side, and the smaller block 3 is subjected to the breaking force. As shown in FIGS. 7 and 9, the rock breaking device 9 has a cylinder 13 applied to a large block 3 that supports a spreading force F, and a protrudingly driven piston 14 is attached to a small block 3 that receives a breaking action. It is installed by inserting it into the installation hole 10 so as to face each other.

Since the hole diameter D of the installation hole 10 is formed to be larger than the hole diameter d of the hole 4 forming the dividing groove Q, the block 3 can be broken by installing a high-output rock breaking device 9. - 特許庁

The rock splitting device 9 applies a widening force F for widening the groove width of the dividing groove Q to the adjacent shear blocks 3 . Due to this expansion force F, as shown in FIG. 9, a force is applied from the side of the large block 3 to push the small block 3 sideways, and the object 1 is connected to the object 1 only at the inner/back side 3a. The block 3 is split C at the tip position of the rock splitting device 9, and the small block 3 is broken from the object 1. - 特許庁

By simply inserting the rock breaking device 9 shallowly into the dividing groove Q, it is possible to generate a maximum shearing force at the tip of the rock breaking device 9 as the small blocks 3 are pressed by the projection of the piston 14, and the efficiency can be improved from that position. block 3 can be broken. It is preferable that the excavation dimension of the contour groove P and the dividing groove Q is longer than the length of the rock breaking device 9 installed in these grooves P and Q, particularly twice or more the length of the rock breaking device 9. . That is, if the excavation dimensions of the grooves P and Q are longer than twice the length dimension of the rock breaking device 9, the block 3 is split C almost along the length dimension of the rock breaking device 9, and thereby broken. After the block 3 is removed, by inserting the rock splitting device 9 into the hole 4 remaining at the back, the block 3 can be further broken from the object 1 using the already formed hole 4. can work efficiently.

At this time, since the large block 3 has a larger bonding strength to the object 1 than the small block 3, the rock breaking device 9 can be stably supported and operated.

Since the rock breaking device 9 is shallowly inserted into the dividing groove Q, the rock breaking device 9 can be prevented from being caught between the broken blocks 3 and difficult to take out.

Breaking of the relatively large block 3 along the contour groove P is performed as an additional block breaking step after the above block breaking step.

In the additional block breaking step, the rock breaking device 9 is installed in the installation hole 10 formed in the contour groove P so as to apply a widening force F that widens the groove width of the contour groove P. is performed in the same way as

Specifically, of the object 1 and the block 3 adjacent to each other with the contour groove P therebetween, the rock breaking device 9 applies a spreading force F so as to apply a breaking force to the block 3 with the object 1 as a support side. A cylinder is applied to the object 1 to be supported, and the piston 14, which is protruded and driven, faces the block 3 which receives the breaking action, and is inserted into the installation hole 10 and installed.

The rock breaking device 9 applies a widening force F for widening the groove width of the contour groove P to the object 1 and the block 3 . By this expansion force F, the block 3 is pressed sideways against the object 1, and the block 3 connected to the object 1 only by the object 1 and the inner depth side 3a is split C. A block 3 is broken from the object 1 .

At this time, since the block 3 is connected to the object 1 only at the inner/back side 3a and has a small bonding strength, the expanding force F of the rock breaking device 9 is stably supported on the object 1 side, and the block 3 can be broken.

In the additional block breaking step, since the rock breaking device 9 is installed in the contour groove P, the object 1 does not fall down and can be taken out from the installation location without any trouble.

Since the additional block breaking process is intended for relatively large blocks along the contour groove, a rock breaking device may be installed in each of a plurality of installation holes around the block to break the block.

The block breaking process described above is performed in the order that after the small block 3 is broken from the object 1, the larger block 3 is broken from the object 1, and the additional block breaking process is carried out last. .

Specifically, when the small block 3 is broken, an allowance corresponding to the groove width of the dividing groove Q is generated. If the blocks 3 are broken in sequence, there will be more room. By sequentially breaking blocks 3 from the smallest block 3 to the largest block 3 in this manner, gaps can be formed at various locations between the block 3 and the object 1 when removing the block 3 as shown in FIG. Therefore, the block 3 can be removed smoothly.

In the block breaking process, as shown in FIG. 9, a filling 15 is placed in another dividing groove Q adjacent to the dividing groove Q in which the rock breaking device 9 is installed to obtain a reaction force against the expanding force F of the rock breaking device 9. be provided.

Specifically, as described above, among the blocks 3 adjacent to each other via the dividing groove Q, the large block 3 is used as the supporting side, and the breaking force is applied to the small block 3, and the rock breaking device 9 , and is installed in the installation holes 10 of the partitioning grooves Q between these blocks 3, the filling 15 is used to expand the rock breaking device 9 so that the large blocks 3 on the supporting side are not pushed and moved by the expansion force F. For the purpose of obtaining a reaction force against the opening force F, the large block 10 is inserted into another dividing groove Q on the opposite side of the dividing groove Q in which the rock breaking device 9 is installed.

The stuffing 15 is formed longer than the length of the cylinder 13 of the rock breaking device 9 and is inserted to a position deeper than the insertion depth of the rock breaking device 9 so as to obtain a sufficient reaction force.

By providing the stuffing 15, it is possible to avoid an unintended situation such as breaking the block 3 on the supporting side instead of the block 3 to be broken, which hinders the work.

Even when the contour groove P is adjacent to the dividing groove Q in which the rock breaking device 9 is installed, if the filling 15 for obtaining a reaction force against the spreading force F of the rock breaking device 9 is provided in the contour groove P, the breaking target can be obtained. block 3 can be accurately broken.

Finally, the block 3 broken from the object 1 is removed from the object 1, and a recess forming step of forming the recess 2 in the object 1 is performed.

As shown in FIG. 10, each block 3 is provided with a chemical anchor 16, and pulled up by a lifting machine via the chemical anchor 16, thereby removing all the blocks 3. As shown in FIG.

The removal of the blocks 3 in the recess forming step may be performed after all the blocks 3 have been broken, or each time the blocks 3 have been broken in each row in either the left-right direction or the front-rear direction. , or each column may be performed individually.

If each row is removed individually, one block 3 adjacent in the left-right direction or the front-rear direction will not roll over to the other block 3 side, and the removal work can be performed smoothly.

By removing the block 3, as shown in FIG. 11, the recess 2 is formed in the object 1 after removing the block 3 toward the inside in the depth direction.

The recesses 2 can be deeply excavated in the object 1 by starting from the groove forming step and performing the above steps again.

In the method of forming a recess in an excavable object according to the present embodiment described above, various excavable objects 1 such as rocks and concrete bodies are exposed from the outside toward the inner depths in the depth direction. , the work of excavating the contour groove P with the contour shape X of the recess 2 and the inner part of the object 1 surrounded by the contour shape X of the recess 2 from the outside toward the inner depth so as to connect to the contour groove P, Background Art The block 3 can be reliably formed by the contour groove P and the dividing groove Q without expecting cracking as in the above, and the dividing groove Q is applied with an expanding force F to widen the groove width. By installing the device 9 and performing a block breaking step of breaking the block 3 from the object 1 with the rock splitting device 9 in a state where the inner back side 3a is connected to the object 1, the inner back side 3a of the block 3 Since the block 3 can be reliably broken, the block 3 can be appropriately cut out, and the recess 2 can be efficiently formed in the object 1. - 特許庁

Since the block 3 is cut out, except for the groove forming process of forming the hole 4 and the installation hole 10 by the drilling device 5, there is no work that generates noise and vibration such as rock drilling or blasting with a breaker, which adversely affects the surrounding environment. The recess 2 can be statically formed without exerting a

Other dividing grooves Q or contour grooves P adjacent to the dividing groove Q in which the rock breaking device 9 is installed are provided with fillings 15 for obtaining a reaction force against the spreading force F of the rock breaking device 9. The block 3 can be accurately broken, and the work can be prevented from being broken due to the block 3 on the supporting side being broken.

The dividing grooves Q are formed in the object 1 at intervals, and the dimensions L and W of the intervals are set so as to gradually increase in the order of breaking the block 3, so that the bonding strength with respect to the object 1 is increased. can be varied depending on the size of the block 3, so that when the block 3 is broken by the rock splitting device 9, the large block 3 serves as the support side that receives the force, and the small block 3 receives the breaking force effectively. can act on

The rock breaking device 9 can generate a maximum shearing force at the tip position of the rock breaking device 9 to break the block 3 accurately.

A rock splitting device 9 is installed in the contour groove P to apply a widening force F for widening the groove width, and the block 3 whose inner back side 3a is connected to the object 1 is broken from the object 1 by the rock splitting device 9. , all the blocks 3 can be properly cut out.

In the additional block breaking step, the expansion force F is supported by the object 1 to break the block 3 from the object 1, so that the strength of the object 1 can be used to reliably break the block 3. can.

In the above embodiment, the drilling device 5 in which a plurality of drilling bits 6, at least two or more, are arranged side by side was described as an example. Of course you can.

In addition, the filling 15 for obtaining the reaction force against the expanding force F of the rock breaking device 9 is not only installed in another dividing groove Q adjacent to the dividing groove Q in which the rock breaking device 9 is installed , but also in the dividing groove The padding 15 may be provided so as to be continuous to the dividing groove Q adjacent to Q with the block 3 interposed therebetween, and further to the contour groove P. F can be supported by the object 1 .

The maximum weight of the block 3 is set to be equal to or less than the weight that can be moved by the lifting machine used for the removal work. In this embodiment, the vertical interval dimension H of the dividing grooves Q is gradually increased from the bottom to the top so that the coupling strength is increased sequentially from the block 3 at the bottom to the block 3 at the top. , but it is not necessarily limited to this, and the interval dimension H may be the same.

When working inside a building, there may be restrictions on the size of the drilling device 5 (the drill and guides are oriented vertically) and the lifting equipment due to the height of the beams above. be.

1 Object that can be excavated 2 Recess 3 Block 3a Inner depth side of block 9 Rock splitting device 15 Stuffing F Expanding force for widening groove width L, W Dimension of interval between dividing grooves P Contour groove Q Division groove X Outline of recess shape

Claims (6)

A method of forming a recess in an excavable object such as a bedrock or a concrete body by cutting out a block from the outside toward the inner depth in the depth direction,
An operation of excavating a contour groove with the contour shape of the recess from the outside toward the inner depth of the object, and an operation of excavating the contour groove from the outside to the inner depth of the object surrounded by the contour shape of the recess and from the outside toward the inner depth of the object. a groove forming step of excavating a dividing groove for dividing each of the blocks to be cut so as to connect to the contour groove so that the block to be cut is connected to the object only on the inner and inner sides;
A block breaking step of installing a rock splitting device that applies a spreading force to widen the groove width in the dividing groove, and breaking the block that is connected to the object on the inner and rear sides by the rock breaking device from the object;
a recess forming step of removing the block broken from the object from the object and forming the recess in the object;
To an excavable object, characterized in that the dividing groove adjacent to the dividing groove in which the rock breaking device is installed is provided with a filling for obtaining a reaction force against the expanding force of the rock breaking device. method of forming a recess. 2. Excavable according to claim 1, characterized in that the contour groove adjacent to the dividing groove in which the rock breaking device is installed is provided with a padding for obtaining a reaction force against the spreading force of the rock breaking device. method of forming recesses in an object. 3. The dividing grooves are formed in the object at intervals, and the dimensions of the intervals are set so as to gradually increase in the order of breaking the blocks. 3. A method of forming a recess in an excavable object according to claim 1. The rock splitting device is installed in the contour groove to apply a widening force to widen the groove width, and the rock splitting device breaks the block, which is connected to the object on the inner side, from the object by the rock splitting device. A method for forming a recess in an excavable object according to any one of claims 1 to 3, characterized in that it comprises the steps of: Excavable according to any one of claims 1 to 4, characterized in that the excavation dimension of the contour groove or the dividing groove is at least twice the length dimension of the rock breaking device installed in these grooves. method of forming recesses in an object. The stuffing is provided continuously to another dividing groove that is adjacent to the dividing groove in which the rock breaking device is installed, and to another dividing groove that is adjacent to the dividing groove with another block interposed therebetween. A method for forming recesses in an excavable object according to any one of claims 1 to 5.

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