JP4668820B2 - Underground continuous wall construction method and excavator - Google Patents

Description

  The present invention excavates a continuous groove in the ground, in the state of setting a core material such as H steel as a reinforcing material, solidified solidified material in the continuous groove to create a continuous groove, And an excavator used in this construction method.

  As a continuous groove excavator for excavating continuous grooves in the ground, a gate-shaped support frame 2 is attached to a base machine 1 having a self-propelling function (for example, a base machine of a crawler crane) 1 as shown in FIG. A chain cutter type excavating device 4 is attached to the frame 2 via a leader 3, and the base machine 1 is moved laterally while the excavating device 4 is installed in the ground and rotated, so that a continuous groove G is excavated. (See Patent Document 1).

  The excavator 4 is constructed by spanning a chain 8 with an excavating blade between end and bottom sprockets 6, 7 provided on both upper and lower sides of the cutter post 5, so that the upper sprocket 6 on the drive side can be rotated endlessly. Is rotated by a hydraulic motor (not shown).

  Usually, a traversing cylinder (hydraulic cylinder) (not shown) is provided between the support frame 2 and the leader 3, and the excavator is provided by combining the self-propelled function of the base machine 1 and the leader horizontal movement function by the traversing cylinder. 4 is moved horizontally.

  Into the continuous groove G excavated in this way, a solidifying material (self-hardening stabilizing liquid or super-hard hardening liquid) that also serves as a groove-maintaining stabilizing liquid is injected, and H steel or a sheet panel as a reinforcing member is used. A long core material is set up and down, and in this state, the solidified material is solidified to form an underground continuous wall. In some cases, the stabilizing liquid and the solidifying material are selectively used, and the stabilizing liquid is injected while excavating the continuous groove, while the solidifying material is charged and solidified after the groove excavation.

  In addition, when using an elongate thing like H steel as a core material, normally, as shown in FIG. 10, the core material 9 which arranged the core material 9a ... in parallel as shown in FIG. A method is adopted in which the center is suspended by a suspension device such as a crane (only a suspension hook and a suspension rope are shown in FIG. 10) 10 and set in the continuous groove G.

  By the way, as shown in the drawing, there is an underground object A such as a common groove in a shallow portion on the planned excavation line, and if the excavator 4 is laterally moved in a vertical posture, it may interfere with the underground object A.

In this case, by utilizing a known oblique excavation method (see Patent Document 2) in which the leader 3 (or the cutter post 5) is inclined in the left-right direction, the underground object A is avoided as shown in FIG. It is possible to excavate the continuous groove G.
Japanese Patent Laid-Open No. 11-13548 JP-A-9-209396

  However, in this case, although the continuous groove G can be excavated, the assembled core material 9 (the same applies to the case of a single core material) is buried underground in the conventional method in which it is suspended vertically in the groove by the suspension device 10. It could not be installed below the object A.

  This problem occurs not only in the underground buried object A but also in the case where there is a ground structure, etc., and this causes a low strength part without a core material in a part of the underground continuous wall. The solution of the point was sought.

  Therefore, the present invention includes a case where there is an obstacle such as an underground object, and a method for constructing an underground continuous wall in which the core material can be installed at a position that is impossible with the conventional hanging method, And the excavator used for this construction method is provided.

  The invention (construction method) according to claim 1 is to construct an excavator by mounting an excavator, in which a chain with an excavating blade is bridged endlessly between sprockets provided on both upper and lower sides of a cutter post, to a base machine. The excavator is installed in the ground, and the excavator is moved laterally while rotating the chain, so that a continuous groove is excavated in the ground. In the construction method of the underground continuous wall in which the solidified material is solidified in the continuous groove and the continuous wall is built in the ground, the core material is attached to one side of the cutter post after excavation of the continuous groove. Are inserted into the continuous groove along the horizontal axis and are moved laterally together with the excavator to a predetermined position.

  According to a second aspect of the present invention, in the method of the first aspect, after excavating the underground continuous groove to a position below an obstacle such as an underground object by an oblique excavation method in which the chain is rotated while the excavator is inclined. The core material is moved laterally together with the excavator and installed below the obstacle.

  The invention of claim 3 is the method of claim 1 or 2, wherein a plurality of core members are combined on the ground to form an assembled core member, and the assembled core member is in a state where one end side is along one side surface of the cutter post. It is inserted into the continuous groove and moved laterally.

  According to a fourth aspect of the present invention, in the method according to any one of the first to third aspects, the adapter is detachably attached to one side surface of the cutter post, while a guide member is provided on the core member, and the adapter and the guide member are It engages detachably in a state where the lateral movement force of the excavator can be transmitted to the core material while regulating the position to the left and right, and after moving the core material to a predetermined position, the adapter is separated from the core material. .

  According to a fifth aspect of the present invention, in the method of the fourth aspect, the adapter is engaged with the cutter post and the guide member in a state where the adapter is separable upward, and the adapter is lifted after the lateral movement of the core material, thereby the cutter post and the core. It is to be separated from the material.

  The invention of claim 6 is the method according to any one of claims 1 to 5, wherein the core material is formed while rotating the chain to create a flow of the stabilizing liquid around the cutter post in a state where the stabilizing liquid is injected into the continuous groove. It is to move horizontally.

  The invention (excavator) of claim 7 includes an excavation apparatus in which a chain with an excavation blade is bridged in an endless manner between sprockets provided on both upper and lower sides of a cutter post, and a base machine that supports the excavation apparatus. An excavator configured to excavate a continuous groove in the ground by installing the excavator in the ground and moving the excavator laterally while rotating the chain. It includes an adapter that is detachably attached to one side of the cutter post of the excavator at the stage where a long core material is installed as a reinforcing material on the top and bottom, and this adapter is for the guide member provided on the core material, It is configured to be detachably engaged in a state where the lateral movement force of the excavator can be transmitted to the core member while regulating the position in the front-rear and left-right directions.

  According to an eighth aspect of the present invention, in the configuration of the seventh aspect, the adapter is engaged with the cutter post and the guide member in a state in which the adapter is separable upward by engagement portions provided at opposite ends. It is composed.

  According to the construction method and excavator of the present invention, paying attention to the fact that the excavator (particularly the cutter post) of the excavator has high rigidity and high strength, the core material (the core material in claim 3) is attached to the cutter post. In this state, since the horizontal movement function of the excavating device is used to move laterally together with the excavating device, the core material is suspended in the conventional manner including the case where there are obstacles such as underground objects (claim 2). It can be placed at a position that was impossible with the lowering method.

  As a result, the coreless material portion can be eliminated, and a high-strength underground continuous wall can be created.

  Here, according to the inventions of claims 4 and 5 and claims 7 and 8, in order to move the core material laterally while regulating the position in the front-rear and left-right directions by the adapter attached to the cutter post and the guide member on the core material side, The core material can be smoothly moved even in a stable liquid having a large movement resistance, and the adapter and the guide member can be separated after the movement.

  In this case, according to the inventions of claims 5 and 8, the adapter can be separated from the cutter post at the same time as being separated from the core material.

  Further, according to the invention of claim 6, since the core material is laterally moved while rotating the chain to create a flow of the stable liquid around the cutter post, the movement resistance due to the stable liquid is reduced, and the core material and the excavator are more It can be moved sideways smoothly.

  An embodiment of the present invention will be described with reference to FIGS.

  In this embodiment, since the configuration of the excavator itself is the same as that of the excavator shown in FIG. 9, the same parts as those shown in FIG.

  Moreover, in embodiment, the case where the underground object A exists on an excavation planned line is taken as an example.

In this construction method,
(i) A continuous groove G is excavated below the underground buried object A, and a solidifying material that also serves as a stabilizing liquid in the continuous groove G (self-hardening stabilizing liquid or super-hard hardening liquid; hereinafter simply referred to as a solidifying material) After injecting
(ii) As shown in FIG. 1, an adapter 11 is attached to one side of the cutter post 5 of the excavator 4;
(iii) As shown in FIGS. 2 and 3, the assembled core material 9 is suspended by the suspension device 10 and is brought along the adapter 11.
(iv) In this state, as shown in FIGS. 4 and 5, the core material 9 is moved sideways to a predetermined position together with the excavator 4 by the self-propelled function of the base machine 1;
(v) As shown in FIG. 6, the adapter 11 is separated from the core material 9 and the cutter post 5.

  The adapter 11, its mounting structure, and the connecting structure of the core material 9 to the adapter 11 will be described with reference to FIGS.

  The adapter 11 is formed in a frame shape that is long in the vertical direction. On the front and rear sides of the left and right sides (cutter post 5 side), U-shaped adapter-side engagement portions 12 and 12 on the front side and the opposite side (the core material 9 side). Convex rail-shaped guide rails 13 and 13 are respectively provided over the entire length on both the front and rear sides.

  On the other hand, on the left and right sides of the cutter post 5 on both the front and rear sides of the chain 8, the adapter side engaging portions 12, 12 are inserted and engaged from above, and the convex rail-like post side engaging portions 14, 14 are inserted. The adapter 11 is engaged with the cutter post 5 so as to be slidable in the vertical direction and separable upward.

  In FIG. 7, 8 a is an excavation blade attached to the chain 8.

  On the other hand, the adapter 11 is provided on both the front and rear sides of an end core material (particularly with branch code 1 and indicated as 9a1) located at the end on the adapter side of the core material 9a. A guide member 15 having a U-shape in plan view that is inserted and engaged with the guide rails 13 and 13 from above is attached by welding or the like.

  The construction procedure based on this structure will be described.

  After excavating the continuous groove G below the underground object A by the oblique excavation method shown in FIGS. 9B and 9C, the adapter 11 is suspended near the cutter post 5 by the suspension device 10 as shown in FIG. Then, they are engaged and lowered from above by the engaging portions 12, 12, 14, and 14, respectively. Thereby, the adapter 11 is attached to the cutter post 5 in a state in which the position is regulated in the front-rear and left-right directions and the upper part can be separated upward.

  The adapter 11 is suspended from the base machine 1 in this attached state.

  Next, as shown in FIGS. 2 to 4, the core material 9 assembled on the ground is suspended at the center of gravity by the suspension device 10, and is engaged with the adapter 11 from above by the mutual guide member 15 and the guide rail 13. To lower.

  As a result, the assembled core material 9 is placed along the left and right sides of the cutter post 5 via the adapter 11.

  In this state, the adapter 11 can be separated upward with respect to the guide member 15 (assembled core material 9) in the same manner as the cutter post 5.

  Further, the adapter 11 and the guide member 15 are in a state in which the lateral movement force of the excavator 4 can be transmitted to the assembled core member 9 while the positions of the adapter 11 and the guide member 15 are regulated in the front-rear and left-right directions.

  The assembled core material 9 is configured by combining the core materials 9a of different lengths so that the upper end of the assembled core material 9 becomes lower on the underground buried object A side in accordance with the excavated surface shape of the continuous groove G excavated obliquely. Is done.

  In this state, as shown in FIGS. 4 and 5, the entire excavator is moved laterally by the self-propelled function of the base machine 1, so that the core material 9 is moved laterally integrally with the excavator, and the underground object A Set the area including the lower part. At this time, the suspension device 10 is moved in accordance with the lateral movement.

  In this case, the cutter post 5, the adapter 11, and the guide member 15 are positionally regulated in the front / rear and left / right directions by their engaging action, so that the lateral movement force of the excavating device 4 is applied to the assembled core material while preventing the assembled core material 9 from shaking. 9 can be told reliably. Thereby, the assembled core material 9 can be smoothly moved laterally even in the stable liquid.

  At this time, it is desirable to move the chain 8 while rotating it at a low speed as shown in FIG.

  By doing this, the rotation of the chain 8 (including the excavating blade 8a shown in FIG. 7) creates a vertical flow and a divided flow of the solidified material (stable liquid at this stage) around the cutter post. Can be reduced, and the assembled core material 9 and the excavator 4 can be laterally moved more smoothly.

  The core material 9 is held at the set position by an appropriate means. Specifically, for example, a core material holding frame such as H-shaped steel is installed in advance on the ground surfaces on both sides of the planned excavation line, and the upper end of the assembled core material 9 is fastened to the core material holding frame.

  When the installation of the assembled core material 9 is completed in this way, the adapter 11 is pulled up by the suspension device 10 as shown in FIG. 6 and separated from the cutter post 5 and the guide member 15 (assembled core material 9).

  In this way, paying attention to the fact that the excavator 4, particularly the cutter post 5 has high rigidity and high strength, the lateral movement function of the excavator 4 is used with the assembled core material 9 along the cutter post 5. Therefore, even if there is an obstacle in the ground surface layer portion or shallow portion including the case where there is an underground buried object A as in this embodiment, the cored material is installed. 9 can be placed below this obstacle.

  As a result, the coreless material portion can be eliminated, and a high-strength underground continuous wall can be created.

Other embodiments
(1) In the excavator provided with the above-described traverse cylinder, when the lateral movement distance of the core assembly 9 may be short, the core assembly 9 may be laterally moved by the lateral movement force of the traverse cylinder. .

  (2) In the above embodiment, after the adapter 11 is attached to the cutter post 5, the procedure for engaging the assembled core material 9 with the adapter 11 is taken. However, the adapter 11 and the assembled core material 9 are engaged on the ground. It is also possible to take a procedure in which the adapter 11 is engaged with the cutter post 5 by lifting the two together.

  (3) Although the case where the assembled core material 9 is installed is illustrated in the above embodiment, the present invention can also be applied to the case where a single core material or a seat panel is installed.

  (4) A web-like protruding piece may be attached to the chain 8 to make the flow of the stabilizing liquid more positive.

  (5) In the above embodiment, the solidifying material that also serves as a stabilizing liquid is introduced into the continuous groove and solidified, but the present invention injects the stabilizing liquid while excavating the continuous groove, and the solidifying material is added after the excavation. The same can be applied to the method of charging and solidifying.

It is a front view which shows the adapter attachment process which shows embodiment of this invention. It is a front view which shows the 1st step which suspends an assembled core material to an adapter after adapter attachment. It is a front view which shows the 2nd step. It is a front view which shows the step which completes suspension of a core material and enters into a horizontal movement. It is a front view which shows the state which moved the assembled core material sideways toward the area | region containing the downward direction of a buried object. It is a front view which shows the state which pulled up the adapter and isolate | separated it from the assembly core material and the cutter post. It is the VII-VII line expanded sectional view of FIG. FIG. 5 is a partially enlarged view of FIG. 4. (a) (b) (c) is a front view which shows the procedure of diagonal excavation. It is a front view which shows the installation condition of the assembly core material by the conventional method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base machine 2 Support frame 3 Leader 4 Excavator 5 Cutter post of excavator 6,7 Upper and lower sprockets 8 Chain 8a Excavation blade 9 Core material 9a Core material which constitutes core material 9b Connecting material which couples core materials DESCRIPTION OF SYMBOLS 10 Lifting device A Underground object 11 Adapter 12 Adapter engaging part 13 The same guide rail 14 Cutter post engaging part 15 Assembly member guide member

Claims (8)

  An excavator is constructed by attaching an excavator formed by linking a chain with an excavating blade endlessly between sprockets provided on the upper and lower sides of the cutter post to the base machine, and the excavator is built in the ground, In addition, a continuous groove is excavated in the ground by moving the excavator laterally while rotating the chain, and solidified in the continuous groove in a state where a long core material is installed vertically as a reinforcing material in the continuous groove. In the construction method of the underground continuous wall that solidifies the material and builds the continuous wall in the ground, after excavating the continuous groove, the core material is inserted into the continuous groove along one side of the cutter post, And the construction method of the underground continuous wall characterized by making it move laterally with a digging apparatus to a predetermined position.   After excavating the underground continuous groove to the position below the obstacles such as underground buried objects by the oblique excavation method in which the chain is rotated with the excavator tilted, the obstacle is moved laterally together with the excavator and the above obstacles 2. The underground continuous wall construction method according to claim 1, wherein the underground continuous wall is installed below.   A plurality of core members are combined on the ground to form an assembled core member, and the assembled core member is inserted into a continuous groove in a state where one end side is along one side surface of the cutter post, and is moved laterally. The construction method of the underground continuous wall of claim | item 1 or 2.   While the adapter is detachably attached to one side of the cutter post, a guide member is provided in the core material, and the lateral movement force of the excavator can be transmitted to the core material while regulating the position of the adapter and the guide member in the front, rear, left and right directions. The underground continuous wall according to any one of claims 1 to 3, wherein the adapter is separated from the core material after being detachably engaged in a state and laterally moving the core material to a predetermined position. Construction method.   5. The adapter according to claim 4, wherein the adapter is engaged with the cutter post and the guide member so as to be separable upward, and the adapter is pulled up and separated from the cutter post and the core after the lateral movement of the core. Construction method for underground continuous walls.   The core material is moved laterally while rotating the chain and creating a flow of the stabilizing liquid around the cutter post in a state in which the stabilizing liquid is injected into the continuous groove. Construction method of underground underground wall of description.   The excavator comprises an endless chain with an excavating blade spanned between sprockets provided on the upper and lower sides of the cutter post, and a base machine that supports the excavator, and the excavator is installed in the ground. In addition, in the excavator configured to excavate a continuous groove in the ground by moving the excavator laterally while rotating the chain, a vertically long core material is installed as a reinforcing material in the continuous groove. An adapter that is detachably attached to one side of the cutter post of the excavator at the stage of the excavator, and this adapter is positioned on the excavator while being position-regulated in the front-rear and left-right directions with respect to the guide member provided on the core member. An excavator configured to be detachably engaged in a state in which a lateral movement force can be transmitted to a core member.   8. The excavator according to claim 7, wherein the adapter is configured to be engaged with the cutter post and the guide member in a state in which the adapter is separable upward by engaging portions provided at opposite ends. .

Images