JPH1121944A - Method of soil-cement diaphragm-wall preparation construction and execution machine therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an execution machine for a soil-cement diaphragm wall, by which the whole earth auger need not be drawn up from a ground at every excavation process and need not also be moved vertically from the ground to an excavation bottom section and no wasteful time is required for installing and shifting the whole execution machine. SOLUTION: The excecution machine for preparing a diaphragm wall is composed of an excavator A2 for a first auger and a second auger excavator A1 having cutting bits in a head 10 for drilling at a lower end and the outer circumferential end of a spiral blade continued from the head 10 and having a spiral blade 11 also having the cutting bit at the outer circumferential end section of an excavation shaft 5 extending over approximately the overall length of the excavation shafts 4, 5. The execution machine is constituted so that the other auger excavator can be moved relatively to one auger excavator to the side and in the vertical direction by sliding support members 7 interposed between each auger excavator, expansion-contraction devices 8 between both auger shafts and a lifting-lowering guide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil cement continuous underground wall construction method using a pair of auger excavators and a construction machine therefor, and in particular, moves one excavator of a pair of auger excavators in a horizontal direction. With the structure capable of excavation, the excavation can be performed simultaneously or alternately in the horizontal direction and the vertical direction, thereby improving the efficiency of the excavation process and the safety of the excavation work.

[0002]

2. Description of the Related Art A conventional soil cement continuous underground wall construction method involves excavating soil in situ using a construction machine such as an earth auger, and simultaneously stirring and mixing cement milk in the ground to form a soil cement wall. The thing which aimed at creation is known. This is done by using a construction machine equipped with a plurality of earth augers having excavation blades at the tip of a shaft rotated by a drive source such as a motor, and for example, these earth augers are vertically moved by a support guide member provided on a crawler crane. It is movably supported.

[0003] In such a construction process using a conventionally known construction machine, a construction area having a constant width and a constant depth by the earth auger is soil-cemented, then the entire earth auger is once pulled up to the ground, and then the ground auger is placed next to the ground. In any case, such as excavating the construction area or constructing the next part with a certain width of interval, and then constructing the remaining part in front of it
Every time when the construction machine for the construction work finished converting the construction width to soil cement, it was necessary to always lift the entire earth auger to the ground.

[0004]

In the above-mentioned conventional soil cement underground wall construction method and the construction machine therefor, as described above, each time the earth is grounded via a column supported by a crawler crane or the like in each step. Since it is necessary to lift the entire auger from the ground and each time it is necessary to move up and down a long distance from the ground to the bottom of the excavation, especially when constructing a deep underground wall, a long excavation time Needless to say, it takes time to install and move the entire construction machine.

Further, a long auger is raised each time,
Movement and re-installation work is extremely dangerous, and particularly in work on narrow work sites and on the ground with poor supporting ground, the work risk and the prolonged construction period were unavoidable. SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and provides a construction method of a soil cement continuous underground wall which is safe, has good workability, can shorten the construction period, and can reduce construction costs, and a construction machine therefor.

[0006]

The present invention employs the following technical means in order to solve the above-mentioned problems. In the invention according to claim 1, a pair of auger excavators are excavated while moving relatively sideways and longitudinally, cement milk is injected and stirred to continuously construct a soil cement underground wall. In the invention according to claim 3, one of the auger excavators is configured to be movable laterally and vertically with respect to the other auger excavator, and the excavator head of the one auger excavator is used. In some construction machines, the rotary shaft is made extendable, so that the drive unit of one auger excavator and the whole of the other auger excavator can move up and down in a certain range and can also excavate to the side.

The concrete solution of the present invention is as follows. (1) While excavating to a predetermined depth by a pair of auger excavators, cement milk is injected to convert the excavated soil into soil cement, and then, one excavation shaft of the pair of auger excavators is used as a support shaft and the other auger is used. While moving the excavator to the side and further excavating by moving in the vertical direction, repeating the work of injecting and stirring cement milk to make soil cement, continuously forming soil cement underground wall continuously Underground wall construction method. (2) An upper reaction force receiving casing provided with a rotary power shaft and a telescopic polygonal rod connected to each other, and a lower end part and a drilling hole near the lower end part in which the telescopic polygonal rod is slidably fitted. A first shaft formed by a rotating shaft to which the head and the horizontal stirring blade are fixed together, a lower reaction force receiving casing provided with an elevating guide ridge on the outer periphery, and a joint jig for enabling the casings to be disengaged. Auger excavator, a drilling head at the lower end, a cutting bit at the outer peripheral end of the spiral blade following the same, and a spiral blade having a cutting bit at the outer peripheral end of the excavation rotary shaft over substantially the entire length thereof. A second auger excavator comprising: a slide support member and a hydraulic cylinder interposed between the respective auger excavators, whereby one auger excavator is laterally and vertically connected to the other auger excavator. In the direction Characterized by being movable in a pair to, construction machinery underground diaphragm walls Construction.

[0008]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows one embodiment of a construction machine for continuous underground wall construction according to the present invention. In particular, only a pair of earth auger excavators which are main parts thereof will be described. 2 to 10 show a partial structure of the construction machine. Also, FIGS.
Drawing 13 is an explanatory view showing each process which implements the continuous underground wall creation method concerning the present invention which applied the above-mentioned construction machine.

First, the construction machine shown in FIG. 1 will be described. The construction machine of this embodiment comprises a pair of earth auger excavators A1 and A2, one of which is provided via a lateral slide support member 7 and a hydraulic cylinder device 8. Earth Auger Excavator A
2, the other earth auger excavator A1 is configured to be relatively movable in the vertical and horizontal directions. Descriptions of support means, moving means, and the like of a conventionally well-known earth auger excavator are omitted.

The one earth auger excavator A2 has a rotary power shaft 15 for transmitting torque of an upper drive motor to a lower excavation shaft via a speed reduction mechanism, and a telescopic polygonal rod 2 connected thereto. The upper reaction force receiving casing 1 provided in an integrally formed shape, the telescopic polygonal rod 2 is slidably fitted therein, and a lower end portion and a drilling head 10 and a horizontal stirring blade are provided near the lower end portion. A lower reaction force receiving casing 9 provided with a rotating shaft 4 to which the fixing member 12 is fixed, and elevation guide ridges 6 on its outer periphery;
And a jig 3 for a joint for removably connecting the two.

The other earth auger excavator A1 has a drilling head 101 that can be drilled both vertically and horizontally by a tip drill bit and a spiral blade drill bit at the lower end of the drilling rotary shaft 5 and at appropriate intervals. The spiral blade 11 provided with a cutting bit on the blade periphery is provided on the other parts except the shaft support part with respect to the lower reaction force receiving casing 9 provided in the above.
Is formed. Each of the drilling heads 10 and 101 is provided with a step between the drilling heads.

FIG. 2 is a partially detailed view showing part A of the earth auger excavator A2 shown in FIG. 1 in detail, in which the rotary shaft connected to the lower reaction force receiving casing 9 by the bearing stopper 16 is shown. 4, the lower end of the upper reaction force receiving casing 1 and the upper end of the lower reaction force receiving casing 9 are formed under the condition that the telescopic polygonal rod 2 integral with the rotary power shaft 15 is fitted into the polygonal inner hole of FIG. Matched,
The joint jigs 3, 3 are applied at the abutted portions to removably connect the casings 1, 9 with each other.

A pair of elevating guide ridges 6, 6 are fixedly mounted on the outer periphery of the lower reaction force receiving casing 9 in parallel with the axis thereof, and a supporting portion for the other excavation rotary shaft 5 and a slide guide member. A supporting guide jig 14 is provided at both ends, and a lateral slide guide member 7 that supports the excavation rotation shaft 5 of the other earth auger and the lower reaction force receiving casing 9 so that they can approach and separate from each other. On both outer sides, a hydraulic cylinder device 8 for operating the lateral slide guide member 7 so as to be able to be separated is provided. The lateral slide guide member 7 is provided with the guide jig 14 for supporting the slide guide member. It is guided by the elevation guide ridges 6 and 6 and can move up and down.

FIG. 3 is a side view showing the vicinity of the portion A in the earth auger excavator A2 shown in FIG. 1 in more detail, and shows a state in which the casings 1 and 9 are separated. When the joint jigs 3 connecting the casings 1 and 9 are removed by applying the jigs 3 and 3 in the direction of the arrow, the connection between the casings 1 and 9 is released. As a result, the lower end portion of the casing 1 and the upper end portion of the casing 9 are connected to the rotary shaft 4 connected to the casing 9 by the bearing stopper 16 in a state in which the expandable and contractible polygonal rod 2 integrated with the rotary power shaft 15 is fitted. Are separated.

A bearing for the other excavating rotary shaft 5 and a guide jig 14 for supporting a slide guide member are provided at both ends thereof, and a space between the other excavating rotary shaft 5 and the lower reaction force receiving casing 9 is provided. The lateral slide guide member 7 for supporting the hydraulic cylinder 81 and the piston (or ram) 82 so as to be able to approach and separate from each other is provided. The guide jig 14 for supporting the slide guide member is guided by the elevation guide ridges 6, 6. It can be moved up and down.

FIG. 4 is a sectional view taken along the line AA in FIG. 3. The rotary shaft 4 is connected to the lower reaction force receiving casing 9 by a bearing stopper 16 and is inserted into a polygonal inner hole of the rotary shaft 4. The expansion / contraction polygon rod 2 is fitted,
On the outer periphery of the casing 9, a pair of lifting guide ridges 6,
6 is fixed. The horizontal slide guide member 7 is provided with a pair of hydraulic cylinder devices 8, 8 that allow the lower reaction force receiving casing 9 and the other excavation rotary shaft 5 of the earth auger A 1 to approach and separate from each other. Guide jigs 14, 14 for sliding guide member support, which are connected to pistons or rams 82, 82 (coupled to the bearing member 73 of the excavation rotary shaft 5) and the pair of elevating guide ridges 6, 6, respectively. Is provided.

FIG. 5 is a side view showing the vicinity of the portion B in the earth auger excavator A1 shown in FIG. 1 in detail. The outer periphery of the lower reaction force receiving casing 9 is parallel to the axis thereof as described above. In the same manner as described with reference to FIG. 3, the casing 9 is provided on both sides of a lateral slide guide member 7 which is guided by the lift guide ridges 6 and 6 and which can be moved up and down. A hydraulic cylinder 81 and a piston 82 are provided so as to be able to approach and separate from the excavation rotary shaft 5.

A support member 73 of the other excavating rotary shaft 5 and a guide jig 14 for supporting a slide guide member are provided at both ends, and a lateral support for supporting the excavating rotary shaft 5 and the casing 9 so that they can approach and separate from each other. Outside the directional slide guide member 7, hydraulic cylinder devices 8, 8 for operating the lateral slide guide member 7 so that they can approach and separate from each other are provided. The guide jig 14 for supporting the slide guide member is vertically movable by being guided by the elevation guide ridges 6, 6.

FIG. 6 is a sectional view taken along the line BB in FIG. 5, in which the rotary shaft 4 is inserted into the lower reaction force receiving casing 9, and the polygonal rod for expansion and contraction is inserted into the polygonal hole of the rotary shaft 4. 2
Are slidably fitted. Similarly, a pair of elevating guide ridges 6, 6 are fixedly provided on the outer periphery of the casing 9. The lateral slide guide member 7 is connected to the pair of hydraulic cylinder devices 8 and 8, which make the casing 9 and the other excavation rotary shaft 5 detachable, and the pair of elevating guide ridges 6 so as to be guided. The guide jigs 14 for supporting the slide guide member are provided.

FIG. 7 is a side view showing a state in which the excavation rotary shaft 5 of the other earth auger excavator A1 is separated from the lower reaction force receiving casing 9 in the direction of the arrow from the state shown in FIG. is there. The lateral slide guide member 7, which is guided and supported on the elevating guide ridges 6, 6 fixedly mounted on the outer periphery of the casing 9 by the slide guide member supporting guide jig 14, is extended by driving the hydraulic cylinder device 8. And the excavation rotary shaft 5 of the other earth auger excavator A1 rotatably supported by the shaft support member 73 of the lateral slide guide member 7 expands in the arrow direction with respect to the casing 9. Is done.

FIG. 8 is a sectional view taken along the line CC in FIG. 5 and 6, the rotating shaft 4 is fitted in the lower reaction force receiving casing 9, and the telescopic polygonal rod 2 is fitted in the polygonal hole of the rotating shaft 4. Further, a pair of elevating guide ridges 6 are fixedly provided on the outer periphery of the casing 9. On the other hand, the horizontal slide guide member 7 is slidably connected to the pair of hydraulic cylinder devices 8 and the pair of elevating guide ridges 6, 6 which allow the casing 9 and the other excavation rotary shaft 5 to be separated from each other. Guide members 14 for guiding member support are provided,
The casing 9 and the other earth auger excavator A2
The separation action between the excavation rotary shafts 5 is achieved by extending the lateral slide guide member 7 by driving a pair of hydraulic cylinder devices 8. 7 and 8 described above.
As is particularly apparent in the above, the lateral slide guide member 7 is usually constituted by an outer cylinder 71 and an inner cylinder 72 which are slidably fitted to each other. For example, the end of the inner cylinder 72 is an excavation rotary shaft. 5 and the rotation supporting member 73. At the same time, of the lateral slide guide member 7, the outer cylinder 71,
Of course, the shape of the inner cylinder 72 and its positional relationship are freely determined.

FIGS. 9 and 10 are a side view and a plan view showing a spiral wing 11 with a cutting bit fixed to the excavation rotary shaft 5 in the earth auger excavator A1 shown in FIG. As is clear from both figures, a cutting bit 13 is provided on the outer peripheral end of the spiral blade 11 over its entire length, and the spiral blade 11 rotates together with the rotation of the excavation rotary shaft 5. When the excavation rotary shaft 5 is driven to rotate while the earth auger excavator A1 is laterally moved by the hydraulic cylinder device 8, soil is removed over the entire length of the excavation shaft. Further, it is obvious that the spiral wing with the cutting bit has a mixing and stirring action of the cement milk and the excavated soil.

Next, the method of the present invention for forming a soil cement underground wall by using the construction machine having the structure shown in FIGS. 1 to 10 will be described with reference to FIGS. 11 to 13. Details will be described with reference to the drawings. First, a construction machine including a pair of earth auger excavators A1 and A2 is installed on a support portion (not shown) of a device such as a crawler crane which is a well-known auger support drive device located on the GL. Put.

As shown in FIG. 11A, which is an initial step, the two casings 1 and 9 of one earth auger excavator A2 are connected to each other by the joint jig 3 so as not to be separated from each other. The earth auger excavators A1 and A2 are fixed in proximity to each other by the slide guide member 7 and the hydraulic cylinder device 8, and are driven and excavated. At the same time, while the cement milk is being injected, the predetermined excavation area is stirred by the stirring blade and the spiral blade. Made into soil cement. This process is substantially the same as the underground excavation process of a conventionally known two-axis type earth auger, and the drive shaft,
It is also possible to add a rotary excavation axis or the like.

Next, as shown in FIG. 11B, the driving of both earth auger excavators A1 and A2 is stopped to release the locking of the joint jig 3, and then the two earth auger excavators A1 and A2 are stopped. Raise A2 together. Then, the telescopic polygonal rod 2 slides while maintaining the state of being fitted into the polygonal inner hole of the rotating shaft 4, and is pulled out from the shaft 4.
Along with this, the excavation rotary shaft 5 of the other earth auger excavator A1 moves upward via the guide jig 14 for supporting the slide guide member guided by the elevating guide ridges 6, 6 of the lower reaction force receiving casing 9. Then (see the arrow), the upper end of the spiral wing 11 with the cutting bit provided on the excavation rotary shaft 5 is pulled up to the position of GL.

In the next step, as shown in FIG. 12 (c), when the earth auger excavator A1 is rotationally driven while simultaneously driving the plurality of hydraulic cylinder devices 8 to extend the respective slide guide members 7, The earth auger excavator A2, which has been stopped, can use the earth auger excavator A1 as a reaction force support shaft to excavate the soil on the side (see the rightward arrow) over its entire length. At this time, earth auger excavator A
While simultaneously rotating the excavating rotary shaft 5 and moving the two auger excavators A1 and A2 vertically by an arbitrary amount, the excavating rotary shaft 5 having the spiral wings 11 with the cutting bit is simultaneously moved to the hydraulic cylinder. When the extension movement is performed to the side by the device 8, the excavation area can be enlarged from the state shown in FIG. 3C to the state shown in FIG. Of course, during this time, the injection and stirring of the cement milk can be continued.

FIG. 12 (d) shows the operation of the earth auger excavator A1 in FIG. 12 (c) by repeating the excavation movement in the lateral and vertical directions, thereby making the soil cemented area its spiral with the cutting bit. This shows a state where the wing 11 and the hydraulic cylinder device 8 are fully expanded. Even in this state, the excavating head 10 serving as the reaction force axis of the earth auger excavator A2 and the rotating shaft 4 thereof are immovable regardless of the vertical movement of both auger excavators A1 and A2. Further, FIG. 12 (e) shows a mode following the operation of FIG. (D), in which the slide guide member 7 extended by driving the hydraulic cylinder device 8 is reduced, and the earth auger excavator A
1 and the like are returned to the state shown in FIG.

FIG. 13F shows a mode in which the steps of the above-described series of cycles are completed, the two augers are moved, and the operation proceeds to the next lateral excavation work. By locking the joint jig 3, both the one earth auger excavator A2 and the other earth auger excavator A1, which are joined so that the ends of the casings 1 and 9 abut each other, move integrally,
Both of the earth auger excavators A1 and A2 are pulled up to the excavation bottom position where the tip of the drilling head 10 of the earth auger excavator A2 has previously been excavated by the tip of the drilling head 101 of the other earth auger excavator A1. (See arrow).

(G) of the same figure shows the two earth auger excavators A at the position where they were dug laterally by the series of operations up to the previous figure.
1 and A2 are integrally moved, and from this position, FIG.
1 shows an operation for repeating the procedure shown in FIG. 1A, in which the drilling head 10 of the earth auger excavator A2 is excavated and penetrated into the bottom left by excavation by driving one of the earth auger excavators A2. This shows an excavation posture for making this a reaction force support shaft.

Both earth auger excavators A1 as described above,
After successively repeating the new excavation operation of A2 to soil cement the area of the desired length, both earth auger excavators A1 and A2 are completely lifted, and the work of constructing the soil cement underground wall is completed. I do.

[0031]

As described above, according to the construction machine of the present invention and the soil cement underground wall construction method using the same,
As with the conventional construction method, the entire construction machine is raised at the end of each excavation process, and this involves unstable and dangerous moving work such as moving the auger for large depth with the entire auger raised above the ground. Absent. In other words, to lift the entire long construction machine to the ground, stable supporting ground and a large working space are required, but in most urban construction sites, excavation operations are performed in small areas. According to the present invention, continuous excavation work and creation of a soil cement underground wall can be performed most of the work underground according to the present invention. Because it is possible, construction work can be easily performed even in a small work site, and it is extremely safe and efficient because the auger excavator only needs to be moved by the length of the insertion portion of the support shaft during a series of work processes. . Furthermore,
Since a series of formation steps can be continuously performed, the excavation speed and the formation speed are very fast, and an excellent effect of significantly shortening the construction work period can be achieved. In addition, there is no waste in moving the construction machine during construction, and the excavation speed and the underground wall creation speed can be significantly increased.

[Brief description of the drawings]

FIG. 1 is a front view of an auger part in a construction machine according to the present invention.

FIG. 2 is a detailed explanatory view in the vicinity of a portion A in the earth auger excavator A2 shown in FIG.

FIG. 3 is a front view showing the vicinity of a portion A in the earth auger excavator A2 shown in FIG. 1 in detail.

FIG. 4 is a sectional view taken along the line AA in FIG. 3;

FIG. 5 is a front view showing the vicinity of a portion B in the earth auger excavator A1 shown in FIG. 1 in detail.

FIG. 6 is a sectional view taken along the line BB in FIG.

FIG. 7 is a front view showing a state in which another excavation rotary shaft of the portion shown in FIGS. 5 and 6 is separated from the casing in the direction of the arrow.

8 is a sectional view taken along the line CC in FIG. 7;

FIG. 9 is a side view showing a rotary spiral blade with a cutting bit fixed to an excavation rotary shaft in the earth auger excavator A1 shown in FIG. 1 of the present invention.

FIG. 10 is a cross-sectional view of the cutting rotary spiral blade shown in FIG. 9;

FIG. 11 shows a first step (a) in which a pair of earth auger excavators is applied and a pair of earth auger excavation while leaving the rotation axis of one earth auger excavator in the soil cement wall forming method of the present invention. It is explanatory drawing which shows the 2nd process (b) which lifted the machine a small distance.

FIG. 12 In the soil cement wall creation method of the present invention, a third step of moving the other earth auger excavator laterally and longitudinally with respect to one earth auger excavator to expand the soil cementation area ( C) Similarly, the fourth step (d) for forming the desired soil cemented area and the excavation and formation by the third and fourth steps are completed, and one earth auger excavator is replaced with one earth auger excavator. It is a figure explaining the 5th process (e) which moves to the side and reduces the space | interval.

FIG. 13: In the soil cement wall construction method of the present invention, following the step of (e) in FIG. 12, a sixth step (f) of excavating both earth auger excavators to the height of the remaining part and both earth augers Explanatory drawing of the seventh step, ie, the initialization step (g), in which the excavator is moved to the side, which is the soil cementation area, and the drilling head of one earth auger excavator is located in a portion left after excavation. It is.

[Explanation of symbols]

 A1, A2 Earth auger excavator 1 Upper reaction force receiving casing 2 Polygonal rod for expansion and contraction 3 Jig for joint 4 Rotation axis of drilling head of one earth auger 5 Rotation axis of excavation of the other earth auger 6 Lifting guide ridge Reference Signs List 7 lateral slide guide member 8 hydraulic cylinder device 9 lower reaction force receiving casing 10, 101 drilling head 11 rotary spiral blade with drill bit 12 horizontal stirring blade 13 drill bit 14 guide guide jig for slide guide member support 15 rotation Power shaft 16 Bearing stopper

Claims (5)

[Claims] 1. Excavating to a predetermined depth by a pair of auger excavators, injecting cement milk to soil cement the excavated soil, and then using one of the pair of auger excavators as a support shaft and the other up and down. Excavating the side of the auger shaft while moving in the direction and side, and injecting and stirring the cement milk, and then returning the other auger excavator to the side of the one auger excavator, and then positioning a pair of auger excavators. By lifting the excavator and moving it to the tip of the side excavation part, lowering the whole, and repeating the above series of operations using one auger excavator as a support shaft, the soil cement ground wall is continuously formed. Construction method of continuous underground wall. 2. The method according to claim 1, wherein the other auger excavator is moved up and down a plurality of times while the other auger excavator is moved laterally. 3. An upper reaction force receiving casing provided with a rotary power shaft and a telescopic polygonal rod connected to each other, a telescopic polygonal rod slidably fitted therein, and a drilling hole formed at a lower end portion and in the vicinity thereof. Excavation of a first auger formed by a rotating shaft to which both a head and a stirring blade are fixed, a lower reaction force receiving casing provided with an elevating guide on the outer periphery, and a joint jig capable of engaging and disengaging the casings. Machine, a drilling head at the lower end and a cutting bit at the outer peripheral end of the spiral blade following the drilling head, and a drilling rotary shaft further provided with a spiral blade having a cutting bit at the outer peripheral end substantially over its entire length. The second auger excavator is constituted by two auger excavators, and a slide support member interposed between the respective auger excavators, the two auger inter-axle expansion / contraction devices, and the lifting / lowering guide allow the other auger excavator to be positioned with respect to one auger excavator One And a construction machine for continuous underground wall construction, wherein the construction machine is configured to be relatively movable in a vertical direction. 4. The construction machine according to claim 3, wherein the lifting guide has a pair of ridges. 5. The construction machine for continuous underground wall construction according to claim 3, wherein the slide support member and the auger between the auger shafts are constituted by a cylinder fitted to each other and a hydraulic cylinder device. .