JP2020063609A - Excavation device, and burying construction method of structure - Google Patents

Abstract

To obtain a reactive force in a horizontal direction by pressing a side face of an underground structure or a hole with an excavation device, to excavate even a hole in a hard ground in a lateral direction with high excavation property to extend the same, and to bury the structure in the hole continuously.SOLUTION: An excavation device 1 comprises: a chain cutter-type excavation portion 10 driving to rotate a chain cutter including a cutter drilling a ground G on an outer peripheral portion; and a jack 20 connected to the excavation portion. The jack is disposed to be adjacent to the outer peripheral portion, whose elongation direction is a direction moving away from the outer peripheral portion. In an excavation step, while an extension side inner wall portion Hf of a hole H is excavated by the excavation device, the jack is elongated so that the jack presses an opposite side inner wall portion with respect to the extension side inner wall portion directly or via an object (P), and thus the excavation portion is moved to the extension side of the hole. The jack is compacted, so that a room is provided between the opposite side inner wall portion or the object and the jack, and a component (P) of a structure is buried, to make it the object.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an excavation device and a structure burying method for burying a structure in the ground using the excavation device.

BACKGROUND ART Conventionally, a structure burying method is known in which a pile material is buried in a digging hole formed in the ground by using a chain cutter type digging device (Patent Documents 1 and 2).
In the invention described in Patent Document 1, the excavation hole adjacent to the existing pile is excavated by guiding the excavation device into the ground by following the guide member to the existing pile buried in the ground, and then, A plurality of piles are continuously buried in the ground by pulling up the drilling device from the ground and further burying the piles in the drilled holes.
In the invention described in Patent Document 2, the chain cutter type excavating device is arranged so as to excavate the excavation hole at a position adjacent to the existing pile material already buried in the ground, and then the chain cutter type excavating device. The lower end of the device is used as a fulcrum, and the upper end of the chain cutter excavator is separated from the existing pile material to tilt the chain cutter excavator, and the existing pile material and chain cutter excavator are used. By burying new pile material in the ground along the existing pile material, the lower end of the chain cutter type excavator is pushed out by the newly embedded pile material and the next drilling hole is drilled. To do.

JP, 2007-255148, A JP, 2009-155882, A

However, in the invention described in Patent Document 1, since the excavation hole is formed for each pile material to be buried, the excavation device is pulled out from the ground every time the excavation hole is excavated, and the excavation is performed at the next excavation position. There was a problem that the apparatus had to be moved, the burying work of the pile material was complicated, and the burying work could take time.
In the invention described in Patent Document 2, by inserting a new pile material between the existing pile material and the chain cutter type excavation device, the lower end portion of the excavation device is pushed out. Various conditions are required such as shape, rigidity, etc., forward excavation cannot be performed only by an excavator, and a force for inserting pile material is required.
That is, when attempting to bury the element that constitutes the buried structure in the ground, the burying space is not sufficiently opened and must be expanded by the element. Therefore, a constraint condition for expanding the element such as a predetermined shape and rigidity is imposed, and the degree of freedom in the configuration of the embedded structure is reduced.
The excavator itself cannot perform forward excavation to expand the hole provided in the ground in the lateral direction, and by pushing the pile material between the existing pile material and the chain cutter type excavator, You need to get the momentum.
In addition, pushing the pile material between the existing pile material and the chain cutter type excavator requires a considerable amount of force, so a heavy machine is required. In order to perform the work effectively, the heavy equipment to be applied is limited, such as a special pile press-fitting machine as described in Patent Document 2.

  The present invention has been made in view of the above problems in the prior art, in which the side surface of the structure or the hole in the ground is pressed by the excavating device to obtain a lateral reaction force, which is a hole in the hard ground. However, it is an object to continuously bury the structure in the hole while excavating and extending it with a strong excavating capacity in the lateral direction.

The invention according to claim 1 for solving the above-mentioned problems, a chain cutter type excavating unit that orbitally drives a chain cutter having a cutter for cutting the ground in the outer peripheral portion,
A propulsion drive unit connected to the excavation unit,
The propulsion drive unit is disposed adjacent to the outer peripheral portion, and an operation of pushing the opposite end portion to the outer peripheral portion away from the outer peripheral portion along a direction away from the outer peripheral portion and approaching the outer peripheral portion. The excavation device is configured so that the retracting operation can be driven.

  The invention according to claim 2 is the excavating device according to claim 1, wherein the propulsion drive unit is provided adjacent to an installation section of the chain cutter between two sprockets.

  The invention according to claim 3 is the excavation device according to claim 2, wherein a plurality of the propulsion drive units are provided side by side along the installation direction of the chain cutter in the installation section.

The invention according to claim 4 is
The plurality of propulsion drive units, the end portion facing the chain cutter is fixed to a common housing case,
The casing case is formed to be long in the erection direction, holds the plurality of propulsion drive units at predetermined intervals in the erection direction, and the width thereof is within the excavation width of the chain cutter. Item 3 is the excavation device.

  According to a fifth aspect of the present invention, the excavation unit and the casing case are connected via a guide, and the relative position of the excavation unit and the casing case in the installation direction is changeable. The excavation device described in 1.

  The invention according to claim 6 is the excavation device according to claim 4, wherein cover plates are extended from both sides of the casing case in a direction opposite to the side of the excavation portion.

  According to a seventh aspect of the present invention, the excavation section has a plurality of the chain cutters arranged in parallel, and the excavation section is connected to the propulsion drive section via a member that is inserted between the plurality of chain cutters. To The excavation device according to claim 6.

The invention according to claim 8 uses the excavation device according to any one of claims 1 to 7, wherein a hole provided in the ground is extended laterally by the excavation device while the structure is formed in the hole. A structure burying method for continuously burying objects,
While excavating the inner wall portion on the extension side of the hole by the excavation portion, the opposite end portion of the propulsion drive portion is pushed out, and the inner wall portion on the opposite side to the inner wall portion on the extension side is directly or through an object by the propulsion drive portion. By pushing by pressing, the excavation step of moving the excavation portion to the extension side of the hole,
A space opening step of drawing in the opposite end portion of the propulsion drive portion, and providing a space between the opposite end portion and the opposite inner wall portion or object that the propulsion drive portion is pressing in the excavation step;
An embedding step of embedding the structural element of the structure in the space to obtain the object,
It is a structure burying method for continuously burying the structure in the hole while extending the hole in the lateral direction by repeating the excavation step, the space opening step, and the burying step in sequence.

  The invention according to claim 9 is the method for burying a structure according to claim 8, wherein the structure is a continuous wall composed of a plurality of pile members and the constituent elements are pile members.

The invention according to claim 10 uses a pile press-fitting machine in which the excavation device is connectable to a chuck portion that grips and raises and lowers the pile material,
The pile press-fitting machine includes a clamp that holds the upper end of the existing pile material, and the chuck portion is movable back and forth with respect to the clamp.
The structure burying method according to claim 9, wherein, in the excavation step, the excavation device is connected to the chuck portion and the vertical position of the excavation portion is held by the pile press-fitting machine.

  The invention according to claim 11 is the method for burying a structure according to claim 8, wherein the structure is a concrete wall and the constituent elements are concrete.

In the invention according to claim 12, concrete is buried in the space in the burying step,
The method for burying a structure according to claim 11, wherein in the excavation step, the concrete is pushed by the propulsion drive unit to move the excavation portion to the extension side of the hole, and the concrete is dehydrated and consolidated.

  According to the present invention, the excavating device has a function of advancing the excavating part by pushing out the propulsion driving part connected to the excavating part. By obtaining a reaction force in the direction, it is possible to carry out the structure burying method of continuously burying the structure in the hole while excavating the hole even in the hard ground in the lateral direction with a strong digging capacity and extending the hole. Therefore, the construction method can be efficiently and smoothly continued while the degree of freedom in the configuration of the buried structure is improved without once pulling out the excavation device from the hole.

It is an implementation situation figure of the structure burial method in which the right side of the excavation device concerning one embodiment of the present invention is shown. It is a front view of the excavation device which concerns on one Embodiment of this invention. It is a top view of the excavation device and pile corresponding to the implementation situation of FIG. It is an implementation situation figure of the structure burial method in which the right side of the excavation device concerning one embodiment of the present invention is shown. It is a top view of the excavation device and pile corresponding to the implementation situation of FIG. It is an implementation situation figure of the structure burial method in which the right side of the excavation device concerning one embodiment of the present invention is shown. It is a top view of the excavation device and the pile corresponding to the implementation situation of FIG. It is an implementation situation figure of the structure burial method in which the right side of the excavation device concerning one embodiment of the present invention is shown. It is a top view of the excavation device and the concrete wall corresponding to the implementation state of FIG. It is an implementation condition figure of the structure burial method in which the right side of the excavation device and the pile press-fitting machine concerning one embodiment of the present invention is shown. It is an implementation situation figure of the structure burial method in which the right side of the excavation device concerning other one embodiment of the present invention is shown. It is an implementation situation figure of the structure burial method in which the right side of the excavation device concerning other one embodiment of the present invention is shown. It is an implementation situation figure of the structure burial method in which the right side of the excavation device concerning other one embodiment of the present invention is shown. It is an implementation situation figure of the structure burial method in which the right side of the excavation device concerning other one embodiment of the present invention is shown. It is an implementation situation figure of the structure burial method in which the right side of the excavation device concerning other one embodiment of the present invention is shown. It is an implementation situation figure of the structure burial method in which the right side of the excavation device concerning other one embodiment of the present invention is shown.

  An embodiment of the present invention will be described below with reference to the drawings. The following is one embodiment of the present invention and does not limit the present invention.

[Outline of excavation equipment]
First, the excavation device of the present embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is an implementation status diagram of a structure burying method in which the right side surface of the excavation device 1 of the present embodiment is shown. FIG. 2 is a front view of the excavation device 1 of the present embodiment. The excavation surface side is the front. FIG. 3 is a top view of the excavation device and the pile corresponding to the implementation state of FIG. 1.

The excavation device 1 of the present embodiment includes a chain cutter type excavation unit 10 and a jack 20 as a propulsion drive unit.
The excavation portion 10 is arranged at a frame post 11 extending in the vertical direction, a drive sprocket 12 arranged at an upper end portion of the frame post 11 and rotated by a drive motor 13, and a lower end portion of the frame post 11. A chain cutter including a driven sprocket 14, an endless chain 15a that is placed around the drive sprocket 12 and the driven sprocket 14 and is arranged along the outer circumference of the frame post 11, and a cutter bit 15b that is arranged on the outer circumference of the endless chain 15a. And 15.

As shown in the figure, the excavation unit 10 has two chain cutters 15L and 15R arranged in parallel.
The left drive sprocket 12L, the driven sprocket 14L, and the chain cutter 15L are arranged on the left side of the frame post 11, and the casing of the drive motor 13L connected to the drive sprocket 12L is arranged so as to project to the right side of the frame post 11. Has been done.
The right drive sprocket 12R, the driven sprocket 14R, and the chain cutter 15R are arranged on the right side of the frame post 11, and the casing of the drive motor 13R connected to the drive sprocket 12R is arranged so as to project to the left side of the frame post 11. Has been done.
The left and right driven sprockets 14L and 14R are arranged at the same position on the lower end of the frame post 11 symmetrically, and the lower ends of the left and right chain cutters 15L and 15R are aligned at the same height.
The left chain cutter 15L is made longer than the right chain cutter 15R, and the left drive sprocket 12L and the drive motor 13L are arranged above the right drive sprocket 12R and the drive motor 13R.

  As shown in FIG. 3, guides 21 are arranged on the rear side of the left and right chain cutters 15L and 15R. The guide 21 is connected via a member that is passed between the two chain cutters 15L and 15R. The member to be passed between the two chain cutters 15L and 15R may be a part of the frame post 11, a part of the guide 21, or another part. If there are a plurality of chain cutters, a structure in which a member is passed between two adjacent chain cutters can be configured, so the number of chain cutters is not limited to two. For example, a member may be provided so as to pass between each of two locations of three chain cutters arranged in parallel.

  Further, a housing case 22 is arranged on the rear side of the guide 21, and the excavation unit 10 and the housing case 22 are connected via the guide 21. Therefore, the guide 21 can change the relative position of the excavation unit 10 and the housing case 22 in the installation direction. In the installation section of the chain cutters 15L and 15R between the two sprockets (12L and 14L or 12R and 14R), the endless chain 15a is linearly arranged, and this direction is called the installation direction (hereinafter the same).

As shown in FIG. 3, the jack 20 is disposed adjacent to the outer peripheral portions of the chain cutters 15L and 15R, and the extension and contraction direction of the jack 20 is disposed along the direction away from the outer peripheral portions.
Here, the outer peripheral portions of the chain cutters 15L and 15R refer to the outer peripheral portions of the endless chains 15a. The outer peripheral portion of the endless chain 15a is a portion outside the loop of the endless chain 15a wound around the drive sprocket 12 and the driven sprocket 14 in a loop. "Adjacent to the outer peripheral portions of the chain cutters 15L and 15R" means that they are present outside the loop of the endless chain 15a and in the normal direction of the loop of the endless chain 15a. At that time, the “direction away from the outer peripheral portion” is a direction (including a normal direction) intersecting the tangential direction of the loop of the endless chain 15a.
Further, the jack 20 is provided adjacent to the installation section of the chain cutters 15L and 15R between the two sprockets (12L and 14L or 12R and 14R). That is, it is not a section hung on the sprockets (12, 14), but is sufficiently long, and is provided adjacent to the erection section of the chain cutters 15L, 15R which is a straight section. In addition, although there are two erection sections (straight section), the jack 20 is provided adjacent to only one section side of them, and excavation is performed in the opposite one section.
Further, a plurality of jacks 20 are provided side by side along the installation direction of the chain cutters 15L and 15R (six jacks are provided in the figure). The ends of the plurality of jacks 20 facing the chain are fixed to a common housing case 22. Although a plurality of jacks 20 are applied in the present embodiment, a single jack 20 may be applied. In that case, it is advisable to appropriately select the position in the vertical direction at which the jack 20 is installed in consideration of resistance during excavation. Since the resistance at the time of excavation increases as the depth increases, it is preferable to install the jack 20 in the case of a single unit in the vertical center or slightly lower than the center.
As shown in FIG. 1, the housing case 22 is formed to be long in the erection direction and holds a plurality of jacks 20 at predetermined intervals in the erection direction. As shown in FIG. It fits within the excavation width of 15R.
Although the plurality of jacks 20 are shown at equal intervals in the figure, the resistance at the time of excavation increases as the depth increases, so depending on the ground conditions, the plurality of jacks 20 may be arranged closer to each other in the lower position in the vertical direction. Good.

The jack 20 is connected to the excavation unit 10 as described above.
The extension and contraction direction of the jack 20 is preferably substantially perpendicular to the erection direction, but an inclination angle may be provided depending on the circumstances such as excavation and mechanical restrictions.

Cover plates 23L and 23R extend from both sides of the housing case 22 in a direction opposite to the digging portion 10 side. The lengths of the cover plates 23L and 23R in the up-down direction are made long to reach from the upper end opening of the excavation hole H provided in the ground G to the bottom surface as shown in FIG. It is preferable that the rearwardly extending lengths of the cover plates 23L and 23R reach rearward beyond the extended position of the end of the jack 20 opposite to the chain cutters 15L and 15R as shown in FIG. . This is for closing the space between the concrete pile P and the housing case 22.
As the propulsion drive unit, a jack and similar mechanical devices can be applied. Although the hydraulic cylinder type is shown in the present embodiment, the propulsion drive unit is arranged adjacent to the outer peripheral portions of the chain cutters 15L and 15R, and the opposite end E (see FIG. 3) to the outer peripheral portions is separated from the outer peripheral portions. It suffices that the operation of pushing away from the outer peripheral portion and the operation of retracting toward the outer peripheral portion can be driven along the direction. Therefore, in addition to the hydraulic cylinder type, the propulsion drive unit is pneumatically operated (air jack, see FIG. 11 and FIG. 12), feed screw type, and a combination of a direct acting mechanism and a link mechanism (see FIG. 13 and FIG. 14) ), A combination of the linear motion mechanism and the wedge mechanism (see FIGS. 15 and 16), and various mechanical devices can be applied.
The excavation device 1B shown in FIGS. 11 and 12 uses the air jack 41 as a propulsion drive unit, and has the same configuration as the excavation device 1 in other respects. The excavation device 1C shown in FIGS. 13 and 14 uses a combination mechanism of the linear motion mechanism 51 and the link mechanism 52 as a propulsion drive unit, and otherwise has the same configuration as the excavation device 1. The excavation device 1D shown in FIGS. 15 and 16 uses a combination mechanism of the linear motion mechanism 61 and the wedge mechanism 62 as a propulsion drive unit, and otherwise has the same configuration as the excavation device 1. The wedge mechanism 62 is a complementary combination of the slopes of the two wedges. Note that the illustrated mechanical configuration is merely an example and may be changed as appropriate.

[Example of construction method for burying structures]
Next, a structure burying method using the above-described excavation device 1 will be described with reference to FIGS. 1, 3, and 4 to 7.
The following example is a structure burying method for continuously burying a structure in the hole H while extending the hole H provided in the ground G in the lateral direction (rightward in FIG. 1) by the excavation device 1. , The structure is a continuous wall composed of a plurality of concrete piles P.

The excavation device 1 is installed in the hole H. The hole H may be a hole excavated by the excavation unit 10 or may be a hole provided by other means. When the construction is started from the state where the hole H does not exist, it is sufficient to excavate the ground G by the excavation unit 10 to provide the hole H.
When the excavation device 1 is installed in the hole H, the excavation process for extending the hole H in the lateral direction is started.
In the excavation process, the chain cutters 15L and 15R are started, and the jack 20 is extended (the reverse end portion E is pushed out) while the excavation portion 10 excavates the inner wall portion Hf on the extension side of the hole H. The excavation part 10 is moved to the extension side of the hole H by pressing the inner wall part on the opposite side to the extension side inner wall part Hf directly or through the object (P). By extending all the jacks 20 all at once at the same rate, the excavation unit 10 can be advanced without changing the angle. The amount by which the excavation portion 10 is pushed into the extension-side inner wall portion Hf can be finely adjusted by extending the jack 20. Further, since the angle of the excavation unit 10 can be changed by inclining the extension rate of the jack 20 in the vertical direction, the excavation is performed by changing the posture and the pushing amount of the excavation unit 10 according to the ground condition and the like. You can do it. Further, since the vertical position of the excavation unit 10 can be changed along the guide 21, it is possible to change the excavation from a deep position or from a shallow position according to the ground condition or the like.
With the progress of the main excavation process, the situation shown in FIGS. 1 and 3 shifts to the situation shown in FIGS. 4 and 5.

When the situation shown in FIGS. 4 and 5 is reached, the space opening step is carried out.
In the space opening step, as shown in FIG. 6, the jack 20 is contracted (the reverse end portion E is pulled in), and the opposite inner wall portion or object (P) pressed by the jack 20 in the excavation step and the jack 20. A space R is provided between the opposite end portion E and the opposite end portion E. In the figure, since the jack 20 is pressing the top concrete pile P in the excavation process, a space R is provided between the concrete pile P and the pile P. In the excavation process before inserting the first concrete pile P, the inner wall portion on the opposite side is pressed, and the space R is provided between the inner wall portion on the opposite side in the next space opening step. . In addition, while the hole H is not enlarged so that the cover plates 23L and 23R can be arranged in the hole H, the cover plates 23L and 23R are pushed into the ground. Alternatively, the cover plates 23L and 23R are detached from the housing case 22, and the cover plates 23L and 23R are attached to the housing case 22 and arranged in the hole H after a gap that can be arranged is formed in the hole H.

Next, the burying process is performed.
As shown in FIGS. 6 and 7, in the burying step, the concrete pile P, which is a component of the structure, is inserted into the space R. The concrete pile P will be pushed by the jack 20 in the next excavation process.

  By repeating the above-described excavation process, space opening process, and burying process a plurality of times, the structure is continuously buried in the hole H while extending the hole H in the lateral direction.

  Since the cover plates 23L and 23R block the space between the concrete pile P and the housing case 22 through the above-described steps, the collapse of earth and sand or the like into the hole H can be prevented.

[Other examples of construction method for burying structures]
In the above-mentioned structure burying method, the concrete pile P was inserted into the space R opened in the space opening step. That is, although the components arranged in the space R are inserted in the completed structure, the components of the structure to be inserted in the space R are arranged in the space R in the completed structure. May be a part or a semi-finished product, as long as it is a resistor that can withstand the pressing force of the jack 20.
For example, the structure can be a concrete wall and the components inserted in the space R can be concrete.
In this case, as shown in FIGS. 8 and 9, a long pressing partition plate 24 that connects the tips of the jacks 20 and extends from the lower end to the upper end of the concrete wall CW is applied to the excavation device 1. In the burying step, concrete C is poured into the space (R) from the mixer truck in the state of ready-mixed concrete and buried. At this time, since the pressing partition plate 24 closes off the extension side of the hole H, the pressing partition plate 24 can form the front surface (extension side) of the concrete C. Further, the pressing partition plate 24 prevents the concrete C from flowing out to the cylinder side of the jack 20.
The vertical lengths of the cover plates 23L and 23R and the pressing partition plate 24 are preferably longer than the length from the lower end to the upper end of the concrete wall CW. Thereby, the three sides of the concrete C, that is, both side surfaces and the front surface can be molded. The rear surface of the concrete C is formed by the front surface of the concrete C that has already solidified. As for the rear surface (the end surface on the opposite side to the extension side) and the side surface of the above-ground portion of the concrete wall CW, a template is appropriately applied (the above-mentioned form frame is extended) to form the concrete C (concrete wall CW Not required if there is no above-ground part).
In the excavation process after burying the concrete C, the concrete C is pressed by the jack 20 to move the excavation portion 10 to the extension side of the hole H, and the concrete C is dehydrated and consolidated. That is, it is possible to obtain the advantageous effects that the concrete C embedded in the space (R) functions as the above-mentioned resistor and that the concrete C is pressed and dehydrated to strengthen the concrete C.
Depending on the softness of the concrete C, the upper surface of the concrete C may be appropriately covered and confined to move the excavation portion 10 to the extension side of the hole H and increase the pressing force for dehydrating and consolidating the concrete.
After the above-described forming and consolidation / dehydration strengthening, the solidification of the concrete C is progressed with the passage of time including the excavation process time, and the concrete C does not collapse even if the pressing partition plate 24 is separated from the concrete C. The space opening step is performed, a space (R) is provided between the concrete C and the pressing partition plate 24, and the next burying step is performed. By adjusting the mix and supply timing of ready-mixed concrete so that the space opening process can be started at the end of the excavation process, extra waiting time can be eliminated.
If the concrete wall CW has an above-ground portion, the above-ground formwork is extended as the excavation device 1 advances, and when the concrete C has sufficient strength, the above-ground formwork is removed to complete the work.

[Combination of pile press-fitting machine]
A structure burying method using a pile press-fitting machine in addition to the excavation device 1 described above will be described.
As shown in FIG. 10, the pile press-fitting machine 3 is used to support the excavation device 1.
The pile press-fitting machine 3 is provided with a saddle 30, a clamp 31 provided at a lower portion of the saddle 30 for gripping an upper end of an existing pile P, a slide base 32 that moves back and forth with respect to the saddle 30, and a swivel on the slide base 32. Mast 33 provided, a chuck part (chuck frame 34, a pile gripping chuck 35) provided so as to be able to move up and down with respect to the mast 33, and excavation that is connected to the pile gripping chuck 35 and projects forward to grip the excavation device 1. And a part gripping chuck 36.
The excavation part grip chuck 36 grips the member of the guide 21 on the excavation part 10 side. As shown in FIG. 10, the excavation unit 10 is configured to be longer than the casing case 22 of the jack 20, and the excavation unit gripping chuck 36 excavates the guide 21 at a portion arranged above the casing case 22 of the excavation unit 10. The member on the part 10 side is gripped.

  As described above, since the pile press-fitting machine 3 holds and supports the excavation portion 10 with the excavation portion gripping chuck 36, the vertical position of the excavation portion 10 can be held. It is possible to prevent the excavation unit 10 from moving up and down due to excavation resistance or the like when the excavation unit 10 excavates the ground in the excavation process. Further, when it is desired to intentionally change the vertical position of the excavation unit 10, by moving the chuck frame 34 up and down with respect to the mast 33, not only the pile gripping chuck 35 but also the excavation unit gripping chuck 36 is moved vertically. Thereby, it is possible to change the vertical position of the excavation unit 10.

  In the excavation step, when the jack 20 is extended and the excavation unit 10 is moved forward, the slide base 32 moves forward so that the excavation unit grip chuck 36 follows the forward movement of the excavation unit 10. You can Further, the forward movement force of the excavation unit 10 can be assisted by moving the slide base 32 forward in accordance with the extension operation of the jack 20. With the combined use of the pile press-fitting machine, the posture of the excavation unit 10 can be controlled (angle adjustment) even if the jack 20 is single. Even if the jack 20 is single without using a pile press-fitting machine, the excavation unit 10 can be kept in a constant posture by selecting the installation position of the jack 20 in the vertical direction as described above.

The chuck frame 34 has a penetrating structure that allows the pile to be inserted vertically, and the pile gripping chuck 35 is a mechanism that grips the inserted pile with a cylinder that advances and retracts. Further, the excavation portion gripping chuck 36 is arranged at a position where it does not interfere with the pile inserted in the chuck frame 34.
Therefore, in the burying step, when the concrete pile P is inserted into the space R, the concrete pile P can be sent into the space R below by inserting the concrete pile P into the chuck frame 34 first. The process can be smoothly executed without removing or moving the machine.

In addition, in order to maintain the vertical position of the excavation portion 10, the portion where the excavation device 1 is connected to the chuck portion (chuck frame 34, pile gripping chuck 35) is on the excavation portion 10 side of the guide 21 as described above. It is not limited to the case of using a member. If the guide 21 can be locked, the chuck portion may be connected to the housing case 22, or may be connected at another portion.
Further, the excavation device 1 may be connected to the chuck frame 34 without the pile gripping chuck 35.
In the space opening step and the burying step, the grip by the excavation part grip chuck 36 may be released, and the connection between the pile press-fitting machine 3 and the excavation device 1 may be released.

  Also, in the burying step, the concrete pile P is gripped by the pile gripping chuck 35 before the upper end of the concrete pile P is pulled out from the pile gripping chuck 35, and the jack 20 is extended to insert the portion into the space R of the concrete pile P. Is firmly fixed, the grip of the clamp 31 is released, the clamp 31 is raised together with the mast 33 and the saddle 30, is moved forward together with the saddle 30 by one pile pitch, and is lowered together with the mast 33 and the saddle 30. By holding the upper end of the existing concrete pile P, the forward movement of the pile press-fitting machine 3 is possible. Therefore, the pile press-fitting machine 3 can also move forward following the forward movement of the excavation device 1, and the extension of the hole by excavation and the burying of the concrete pile P can be continuously and smoothly executed.

According to the embodiment described above, since the excavation device 1 has a function of advancing the excavation part 10 by itself by expanding and contracting the jack 20 connected to the excavation part 10, the excavation device 1 causes the underground structure (P) or The side surface of the hole H is pressed to obtain a lateral reaction force, and even a hole of hard ground is excavated in the lateral direction with a strong excavation capacity and extended, while the structure (P, P.・ ・) Can be implemented by a structure burying method that continuously burys. Therefore, without temporarily pulling out the excavation device 1 from the hole H, it is possible to efficiently and smoothly continue the construction method while improving the degree of freedom in the configuration of the buried structure (P).
That is, the preceding excavation of the excavation hole and the embedding of the pile material can be continuously performed, which is efficient. Since the ground is used as a reaction force to extend the jack 20 horizontally, it is not necessary to bury the existing pile in the excavation hole in advance in order to obtain the reaction force, and construction is performed from a state in which the pile material is not embedded in the excavation hole. be able to.
According to the construction method in which the excavation device 1 and the pile press-fitting machine 3 are used together, there are the following advantages as compared with the conventional construction method in which the auger device and the pile press-fitting machine are used in combination.
Since the chain cutter type excavation unit 10 can excavate a portion that cannot be excavated by a middle excavation corresponding to the inner width of the pile by the auger device, the excavation can be performed sufficiently for the pile width and the pile material can be easily buried.
In the conventional construction method using both the auger device and the pile press-fitting machine, it is necessary to suspend the auger in the hollow portion of the pile material and pull it out for each pile material. If you install it on the ground, you can excavate continuously without pulling it up to the ground, so the work process is small and efficient even when excavating one pile material, and the greater the number of buried pile materials, the greater the effect of shortening the construction period. is there.
Further, according to the method of using the excavation device 1 and the pile press-fitting machine 3 described above together, the following advantages are obtained as compared with the case of using only the conventional chain cutter type excavation device having no propulsion drive unit. There is.
When the position of the main excavation device 1 is moved back and forth and up and down, the pile press-fitting machine 3 supports and assists it, so that the operation is stable and the work is safe.
From the excavation of the ground by the excavation device 1 to the burying work of the pile material in the excavation hole, one pile press-fitting machine 3 can be used.
In addition, in the embodiment in which the above-mentioned buried structure is formed by a continuous pile material, the pile buried in the excavation hole is a concrete pile, but other types of piles such as a steel pipe pile may be applied.

1 Excavator 3 Pile press-in machine 10 Excavation part 11 Frame post 12L Drive sprocket 12R Drive sprocket 13L Drive motor 13R Drive motor 14L Driven sprocket 14R Driven sprocket 15L Chain cutter 15R Chain cutter 15a Endless chain 15b Cutter bit 20 Jack 21 Guide 22 Housing Case 23L Cover plate 23R Cover plate G Ground H Excavation hole Hf Extension side inner wall P Concrete pile R Space

Claims (12)

A chain cutter type excavating unit that orbits a chain cutter that has a cutter for cutting the ground on the outer periphery,
A propulsion drive unit connected to the excavation unit,
The propulsion drive unit is disposed adjacent to the outer peripheral portion, and an operation of pushing the opposite end portion to the outer peripheral portion away from the outer peripheral portion along a direction away from the outer peripheral portion and approaching the outer peripheral portion. An excavation device configured to be able to drive a retracting operation. The excavation device according to claim 1, wherein the propulsion drive unit is provided adjacent to an installation section of the chain cutter between two sprockets. The excavation device according to claim 2, wherein a plurality of the propulsion drive units are provided side by side along the installation direction of the chain cutter in the installation section. The plurality of propulsion drive units, the end portion facing the chain cutter is fixed to a common housing case,
The casing case is formed to be long in the erection direction, holds the plurality of propulsion drive units at predetermined intervals in the erection direction, and the width thereof is within the excavation width of the chain cutter. The excavation device according to Item 3. The excavation device according to claim 4, wherein the excavation unit and the casing case are connected via a guide, and the relative position of the excavation unit and the casing case in the erection direction is changeable. The excavation device according to claim 4, wherein cover plates extend from both sides of the casing case in a direction opposite to the direction of the excavation portion. 7. The excavation unit has a plurality of the chain cutters arranged in parallel, and is connected to the propulsion drive unit via a member that is passed between the plurality of chain cutters. The excavation device described in 1. Using the excavation device according to any one of claims 1 to 7, a structure in which a hole provided in the ground is laterally extended by the excavation device and a structure is continuously embedded in the hole. It is a method of burying things,
While excavating the inner wall portion on the extension side of the hole by the excavation portion, the opposite end portion of the propulsion drive portion is pushed out, and the inner wall portion on the opposite side to the inner wall portion on the extension side is directly or through an object by the propulsion drive portion. By pushing by pressing, the excavation step of moving the excavation portion to the extension side of the hole,
A space opening step of drawing in the opposite end portion of the propulsion drive portion, and providing a space between the opposite end portion and the opposite inner wall portion or object that the propulsion drive portion is pressing in the excavation step;
An embedding step of embedding the structural element of the structure in the space to obtain the object,
A structure burying method for continuously burying the structure in the hole while extending the hole in the lateral direction by repeating the excavation step, the space opening step, and the burying step in sequence. The structure burying method according to claim 8, wherein the structure is a continuous wall made of a plurality of pile members, and the constituent elements are pile members. Using a pile press-fitting machine capable of connecting the excavation device to a chuck portion that grips and raises and lowers the pile material,
The pile press-fitting machine includes a clamp that holds the upper end of the existing pile material, and the chuck portion is movable back and forth with respect to the clamp.
The structure burying method according to claim 9, wherein, in the excavation step, the excavation device is connected to the chuck portion and the vertical position of the excavation portion is held by the pile press-fitting machine. The method for burying a structure according to claim 8, wherein the structure is a concrete wall and the constituent element is concrete. Burying concrete in the space in the burying step,
The method for burying a structure according to claim 11, wherein in the excavation step, the concrete is pressed by the propulsion drive unit to move the excavated portion to the extension side of the hole, and the concrete is dehydrated and consolidated.

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