JP3811757B2 - Construction support method for underground continuous wall construction, excavator used therefor, and construction support system - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a construction support method for underground continuous wall construction in which continuous walls such as water stop and foundation soil cement wall are formed in the ground, an excavator used therefor, and a construction support system.

  Conventionally, as an excavator used for construction of an underground continuous wall, a cutter post 51 is suspended from a traveling carriage (or a crawler crane base machine) 50 into the ground as shown in FIG. There is one that continuously excavates a trench (groove) B having a constant width by moving the traveling carriage 50 in the excavation direction (A direction in the figure) while rotating the chain cutter 52 with 51 as a guide.

  Moreover, what has arrange | positioned the screw rod before and behind a cutter post instead of a chain type cutter is also known.

  In an excavator equipped with a chain-type cutter as an excavator, the cutter post 51 of the excavator is composed of a long box-shaped frame, and has a drive wheel (sprocket) 51a provided at the upper end thereof and a lower end thereof. An endless chain 53 is spanned between the provided idler wheels (pulleys) 51 b, and a large number of excavation bits 52 a are attached to the outer peripheral side of the chain 53.

  The underground continuous wall construction method using this type of excavator has the advantages of uniform soil cement wall quality in the depth direction and low water permeability. . Hereinafter, each process of the underground continuous wall construction method will be described with reference to FIG.

(I) Excavation process As shown by a two-dot chain line in FIG. 16 (a), a cutter 52 is built in a previously excavated vertical groove, and the traveling carriage 50 is moved in the excavation direction while rotating the cutter 52. Thus, the continuous groove B ₁ is excavated for a predetermined length. At this time, in order to maintain the shape of the excavated groove B ₁ , an excavating liquid (usually an aqueous bentonite solution) C is injected into the groove B ₁ .

(Ii) As shown in solidifying solution injection process Figure 16 (b), returning the cutter 52 to the excavation starting end while injecting soil solidifying liquid (cement slurry) D in the groove B _1, using the rotation of the cutter 52 Then, the ground solidification liquid D and the drilling liquid C are agitated and mixed. At this time, part of the drilling fluid C overflows and is discharged out of the groove.

(Iii) Re-stirring / mixing step As shown in FIG. 16 (c), stirring and mixing are further performed by moving the cutter 52 to the excavation end side while rotating. After this agitation and mixing, the soil cement wall E is formed when the soil cement, which is a mixture of the ground solidification liquid D, the excavation liquid C, and the raw soil (sediment generated by excavation) is solidified.

(Iv) As shown in the following excavation process 16 (d), newly drilling grooves B ₂ a predetermined length from the end of the formed soil cement wall E. By repeating the above steps, a continuous soil cement wall E can be formed in the ground.

  By the way, this kind of construction method of inserting a cutter post into the ground, forming a groove while pressing the cutter post against the ground together with an excavating bit that rotates, and continuously building a soil cement wall in the groove is Since 10 years have not passed since the development, construction know-how has not been established and grounds with different properties in the depth direction must be excavated at the same time. .

  Therefore, for example, in the work management system of the soil cement wall excavator described in Patent Document 1 below, the ground injection material (excavation liquid and ground solidification liquid) discharged into the excavation groove and the injection positions thereof are visually displayed. By doing so, a system has been proposed in which even an unskilled person can accurately manage the discharge of the ground injection material and the work management of the resulting soil cement wall.

In the above underground continuous wall construction, the construction depth is often deep, and the cutter post is usually left in the excavation groove even if the excavation construction on that day is finished. In this state, when the ground solidification solution wraps around the cutter post, the cutter post cannot be removed from the created end face. Also, even if the cutter post is not solidified by the created end face, if the edge is not sufficiently cut off from the ground end face to be excavated, there will be problems such as the cutter post being bent and damaged at the start of operation. appear. Curing work is performed at the end of excavation work in order to eliminate such troubles, and its purpose is to pull the cutter post away from the ground, to remove the bending of the cutter post in advance, and to solidify the ground The purpose is to leave the cutter post at a liquid injection position, that is, at a position sufficiently away from the forming end face. At the start of construction, it is important to move to a traversing operation after the edge cutting with the ground is confirmed at the retracted position by the edge cutting work.
JP 2000-192500 A

  In performing excavation work, whether or not underground continuous wall construction proceeds according to a schedule often depends on ground conditions. Since there is no clear guideline on how to operate the excavator according to this ground condition, it will eventually depend on the experience and know-how of the site builder, and if the judgment is wrong, the construction period may be delayed. Inevitable. This applies not only to the operation of the excavator but also to the edge cutting operation described above. The current edge cutting operation is performed based on the experience of the operator, and there are operating guidelines for efficient excavation. It has not been clarified.

  The present invention has been made in consideration of the problems in the conventional underground continuous wall construction method as described above, so that it is possible to determine whether or not the edge cutting work at the start of the daily excavation work is appropriately performed. By doing, the excavation construction support method which assists so that underground continuous wall construction can be performed according to a schedule, the excavator used for it, and a construction support system are provided.

  The construction support method of the underground continuous wall construction according to the present invention inserts a cutter post provided with a drilling tool into the ground, and forms a drilling groove by moving the cutter post in the lateral direction while operating the drilling tool. This is a construction support method for underground continuous wall construction, and the cutter post pull-out work and the mechanical load of the excavator are measured for the cutting work of the cutter post carried out before starting the daily excavation work. The gist of the invention is to determine whether or not the edge cutting operation is appropriate by comparing the drawing load and the mechanical load as measurement data with preset values.

  About the said edge cutting operation | work, it is preferable to judge the suitability of an edge cutting operation | work for every process implemented.

  In addition, the measured measurement data can be stored in time series, and the transition of the edge cutting operation can be output as a graph.

  The excavator according to the present invention is an excavator that forms a excavation groove by inserting a cutter post provided with an excavator into the ground and moving the cutter post in a lateral direction while operating the excavator. For the cutting operation of the cutter post that is carried out before starting the daily excavation work, the measuring unit that measures the cutter post drawing load and the mechanical load of the excavator and the set value as the appropriate cutting condition are stored. The edge cutting setting value storage unit, the edge cutting data measured by the measurement unit, and the edge cutting setting value stored in the edge cutting setting value storage unit are compared to determine whether the edge cutting operation is appropriate. The gist of the present invention is that it comprises a judging section for judging.

  In the underground continuous wall construction system according to the present invention, a ground is formed by inserting a cutter post provided with an excavating tool into the ground and moving the cutter post laterally while operating the excavating tool. A medium continuous wall construction system comprising the excavator and a management computer connected to the excavator via a network, the management computer having a database, and the database is excavated at each site. The gist is that it is configured to accumulate data measured at the edge cutting operation performed when starting the operation and to transmit information accumulated in the database in response to a request from the excavator Is. The data measured in the edge cutting operation includes, for example, a cutter post drawing load, a drilling tool mechanical load, and the like.

  As described above, according to the present invention, it is possible to determine whether or not the edge cutting work performed before starting the excavation work is appropriately performed.

  And about the some process implemented about edge cutting work, if the suitability of work is judged for every process, edge cutting work can be performed reliably.

  Further, if the transition of the edge cutting work is graphed and output, the effect of the edge cutting work can be grasped.

  In the excavator according to the present invention, the pulling force when the cutter post is pulled at a slow speed without operating the drilling tool when the edge cutting operation is performed, the mechanical load of the cutter post at the time of pulling, the drilling tool at a slow speed The excavator machine load at the time of driving is measured by the measurement unit and given to the determination unit. The determination unit is configured to determine each value of the measured edge cutting data and the set value stored in the edge cutting setting value storage unit. To determine whether the edge cutting operation has been performed properly. Therefore, it is possible to determine whether the excavator side is appropriate for the edge cutting work performed on site, and the edge cutting work can be efficiently performed.

  According to the construction support system according to the present invention, the edge cutting data obtained at each site is stored in the database, so that the data for the edge cutting operation can be provided to each site.

  Hereinafter, an embodiment of a construction support system for underground continuous wall construction according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an excavator 10 used in the underground continuous wall construction method. The excavator 10 includes a base machine 11 that can move on the ground surface, and a chain cutter (excavator) 12 having a plurality of excavation bits. The chain cutter 12 is configured to excavate the groove T by pressing the ground end surface of the ground F while rotating the outer periphery of the cutter post 13.

  At that time, the excavation muddy water is discharged at a predetermined pressure from the ground injecting agent discharge port 14 provided at the lower end of the cutter post 13 to assist the excavation of the groove T, or the ground solidification liquid is discharged from the discharge port. The soil cement wall E is formed by mixing and stirring with excavated soil.

  In forming the trench excavation and the soil cement wall, so-called one-pass construction in which both are continuously performed, two-pass construction in which the soil cement wall E is formed along the groove T after excavation of the groove T is completed, or After excavation of the groove T, the cutter post 13 is moved again to the excavation start position, and there is a 3-pass construction in which the soil cement wall E is formed along the formed groove T. Is appropriately selected.

  FIG. 2 shows an excavation model by the excavator 10. The excavator 10 moves the excavating bit of the chain cutter in a substantially vertical direction while pressing the cutter post 13 inserted in the ground in the horizontal direction, and excavates every pattern according to the principle of cutting with a canna.

A traverse upper cylinder 15 and a traverse lower cylinder 16 are provided in parallel on the upper portion of the cutter post 13, and the cutter post 13 can be pressed against the ground by the thrust F _PL of the traverse lower cylinder 16. Yes. However, transverse on the cylinder 15 is adapted to generate a cylinder holding force R _PU pressing direction opposite to the direction of the transverse lower cylinder.

If the thrust F _PL is insufficient, the traverse speed of excavation decreases and the ground cannot be excavated. Further, the rated thrust F _PL of the traverse lower cylinder 16 of the excavator 10 shown in the present embodiment is 55 t.

Where νb: tangential speed mm / min, νe: excavation speed mm / Hr, Lp: full section excavation 1 pattern length, tpx: depth of cut mm per pattern,
Lp: tpx = νb: νe
Therefore, the depth of cut tpx = νe / νb · Lp (1)
It is requested from.

  In practice, since the excavation speed is overwhelmingly smaller than the tangential speed, the one-pattern excavation volume S is thinner than that shown in FIG. 2 and the inclination thereof is close to vertical.

  FIG. 3 shows an underground continuous wall construction support system in which a plurality of excavators 10 configured as described above are connected by a network.

In the figure, the excavator 10 on the excavation work site so that it can be transmitted to compress the provided with a radio device, the collected excavation work data and machine load data D ₁ to D _4, etc. Yes.

  When, for example, natural ground excavation work is selected on the construction mode selection screen shown in FIG. 4, the work content and work time are transmitted as excavation work data. Further, the passage of time and the output change of the actuator in the excavator are transmitted as mechanical load data. Each of these data is sent to an underground continuous wall construction management server as a management computer, which will be described later, and graphed for use in construction management.

  The data transmitted from the excavator 10 is received by any of the nearest antennas 20 to 23 shown in FIG. 3, and is transmitted through the public line to the general provider 25 having the relay station 24 and the connection base via the relay station 24. And temporarily stored in the mail server of the provider 25.

  Of course, this provider 25 can transmit / receive data to / from another provider 27 that is independently contracted by a construction organization, a manufacturer of excavator, etc., to which a construction company that owns the same type of excavator belongs. For example, if the computer 28 located in the field office is accessed via the provider 27, a copy of the data temporarily stored in the provider 25 can be captured. Can be edited and edited independently on the side.

  The provider 25 is connected to an underground continuous wall construction management server (hereinafter referred to as a management server) 26. The management server 26 periodically retrieves data stored in the mail server of the provider 25. It has become.

  The ground property data obtained by the drilling survey carried out in advance at the construction site is sent to the management server 26 from the computer 28 at the site or from a terminal mounted on the excavator 10 via a transmission cable or wirelessly. However, other than this, for example, it can be taken into the management server 26 via a portable recording medium such as a floppy (registered trademark) or a CDROM.

  In addition, a pressure sensor is attached to the traverse lower cylinder 16 of the excavator 10, and initial reaction force data detected by the pressure sensor is input to the terminal of the excavator 10 and stored in order, and converted into transfer format data. If the excavator 10 transmits the ground property data to the management server 26, the ground property data can be automatically transmitted.

  The management server 26 can access only the construction member of the underground continuous wall construction whose access is permitted by the password (for example, the computer 29 installed at the head office of the construction member of the underground continuous wall construction, the computer 30 of the construction member). As a result, it is possible to view the latest information of the entire contractor performing underground continuous wall construction.

  Reference numeral 31 denotes a computer installed in the underground continuous wall construction method association office, which performs maintenance of the management server 26 via the provider 25, and corrects stored data and makes various settings to the management server 26. It can be done. In addition, for the terminal of the excavator 10, an application related to underground continuous wall construction can be corrected.

  FIG. 5 shows the basic configuration of the management server 26. The management server 26 includes a database 26 a for storing ground data, excavation traversing speed results collected at the site, and manages access rights to the database 26 a.

  When fetching compressed data from the provider 25, it is checked whether or not the data is that of a pre-registered person, and if it can be checked, the excavator from which the data is transmitted is identified. The update processing unit 26c stores the ground data in the database 26a together with the excavator identification information. In this way, the ground data transmitted from each site is sequentially stored in the database 26a. The database 26a can also store curing data and border cutting data (described later) transmitted from the site.

  In this way, data automatically transmitted from each excavator 10 in operation is identified and accumulated in the database 26a, whereby various data such as excavation conditions are automatically updated. The data obtained in this way is output as numerical values, graphs, etc. on the screen of the CRT 26i which is a display means.

  The management server 26 can be inquired about the excavation efficiency from the site. The flow will be outlined.

  When there is an inquiry about the evaluation of excavation efficiency, the ground strength evaluation unit 26e first reads the ground data stored in the database 26a and creates a ground strength distribution. Next, the necessary excavation capacity calculation unit (pressing force calculation unit) 26f calculates the horizontal direction pressing force of the cutter post 13 that matches the ground strength, that is, the thrust required for the traversing lower cylinder 16 (necessary excavation capacity). If the ground data of the excavation site does not exist in the database 26a, the ground data obtained by the boring survey or the like at the excavation site is once stored in the database 26a, and then the ground strength distribution is created. .

  The obtained thrust of the transverse lower cylinder 16 is compared with the rated output (maximum transverse force) of the excavator 10 by the comparison unit 26g, and the excavation efficiency evaluation unit 26h evaluates the excavation efficiency according to the comparison result, and the evaluation result Is displayed on the screen of the CRT 26i. The evaluation result is transmitted to the provider 25 through the transmission unit 26j and stored in the mail server. Accordingly, each site can receive the inquiry about the excavation efficiency inquired by accessing the provider 25. The keyboard 26d, which is an input means, is used when inputting ground data, groundwater level, and the like.

  Next, the excavation efficiency evaluation process will be described.

  Excavation efficiency evaluation by the construction support system shown in the present embodiment includes ground data (ground column diagram, N value, soil quality, etc.), excavator type (eg, I type, II type, III type, etc.) and construction conditions (depth). , Excavation width, etc.) is determined, the thrust of the traverse lower cylinder 16 required to realize a provisional traverse speed, for example, 100 mm / min, is obtained, and the evaluation value as the rated output ratio of the traverse lower cylinder thrust Is to evaluate the excavation efficiency. If the excavation efficiency is evaluated based on the ground conditions at the site, an excavation construction plan according to the schedule can be made.

  In the present embodiment, not only the excavation efficiency is evaluated, but also the performance data can be easily collected through the network. In addition, since the ground data collected from each excavation site is accumulated in the database 26a, abundant excavation work results can be downloaded from the management server 26 and a precise construction plan can be made at each site.

  6, 7 and 9 show the input fields displayed on the screen of the CRT 26i.

  In FIG. 6, the ground condition input cell is provided with an input field C1 for inputting the number of samples in the standard penetration test depth direction, an input field C2 for inputting the groundwater level, and the like.

  In addition, in the construction condition / underground continuous wall construction specification input field, the construction depth input field C3, tangential speed input field C4, excavation width input field C5, model input field C6, maximum traverse force input field C7, maximum tangential force C8 Etc. are prepared.

  In FIG. 7, the soil property input cell is provided with a soil symbol input field C9, a depth input field C10, and an N value input field C11 which is a test result of the standard penetration test. The ground properties shown in the figure show the results of measurements from 1.15 m to a depth of 32.15 m in the Takasago area of Hyogo Prefecture.

  In the table, for example, “GF” is gravel containing fine particles, silty gravel, clayey gravel, gravel with poor clay distribution, and “ML” is silt (inorganic), very fine sand, fine sand, rock powder. It is a silty clay with a small plasticity and a thin clay, and “GW” indicates gravel and gravel with a good particle size distribution, a sand mixture, and a small fraction.

  Looking at the distribution of N values in the depth direction, it can be seen that the ground strength is particularly high in the depth range of 14.15 to 18.15 m. These ground property data are stored in the database 26a.

  When there is an inquiry about the excavation efficiency evaluation from the site, the ground strength evaluation unit 26e converts the ground strength from the N value for each depth and calculates the cumulative ground strength. Then, the thrust of the traversing lower cylinder 16 that matches the accumulated ground strength is obtained.

The thrust F _PL generated by the traverse lower cylinder 16 includes the excavation pressing resistance R _pc , the traverse friction resistance R _pf , the traverse sliding friction resistances R _pfU and R _pfL generated between the _traversing leader part and the portal frame, and the traverse It is equal to the sum of the cylinder holding force R _pU of the upper cylinder 15.

Thrust F _PL = R _pc + R _pf + R _pfU + R _pfL + R _pU ...... Expression (2)
Since R _pfU + R _pfL is negligible,
Thrust F _PL = R _pc + R _pf + R _pU ...... Equation (3)
Can be considered.

R _pU is obtained by measuring the thrust of the traverse upper cylinder 15.

The excavation pressing resistance R _pc can be theoretically derived from the assumed traversing speed. On the other hand, the transverse friction resistance _Rpf is calculated on the assumption that the transverse friction force applied to each unit depth is constant.

Next, the required excavation capacity calculation unit 26f calculates the balance between the thrust F _PL of the traverse lower cylinder and the accumulated ground strength by replacing it with the moment balance.

FIG. 8 shows an excavation model related to the transverse force. In the figure, the arm reference position of moment is taken as the traverse upper cylinder position, that is, the point of _application of thrust R _pU .

Moment M ₁ in the counterclockwise direction is indicated by generated by the thrust F _PL of the transverse lower cylinder 16 F _PL × L _A. On the other hand, the clockwise moment M ₂ is represented by R _pc × Lx + R _pf × Lx.

The reason why the moment length is Lx is that both R _pc and R _pf are distributed loads. Therefore, in order to obtain the thrust F _PL of the traverse lower cylinder corresponding to the distributed load, the moments at the respective depths are accumulated, and the thrust of the traverse lower cylinder 16 corresponding to the moment balance equation is calculated.

Therefore, first, the resistance force f _RpcHi pressing drilling at each pattern in the depth direction, is obtained in advance the traverse frictional resistance force _f rpfHi.

Note that the above _frpcHi means the ground average reaction force, and is obtained by the surface pressure required to penetrate the excavation bit per pattern in the pressing direction × the area in the pressing direction. This _frpcHi increases as the cutting depth tpx shown in the equation (1) increases. Further, the above f _rpfHi is the frictional resistance force when the cutter post traverses per unit depth.

Next, moments m _rpcHi and m _rpfHi with the traverse upper cylinder 15 position as a fulcrum are calculated. Note that the depth at the center position of the pattern is Hi [m].

_{m rpcHi = (Hi + (L} A + L B) / 1000) f rpcH ...... formula (4)
m _rpfHi = (Hi + (L _A + L _B ) / 1000) f _rpfHi ...... Expression (5)
Next, moments m _rpcHi and m _rpfHi in each pattern are cumulatively calculated in the depth direction, and sums of moments S _mrpcH and S _mrpfH are obtained.

  The moment balance equation is shown below.

F _PL × L _A = (total moment of the excavation _resistance) S mrpcH + S (total moment of the transverse frictional _force) mrpfH ...... formula (8)
Expanding equation (8) above,
F _pLcH = S _mrpcH / L _A (9)
F _pLfH = S _mrpfH / _{LA A} formula (10)
And the thrust F _PL of the traversing lower cylinder 16 can be obtained.

F _PL = (S _mrpcH / L _A ) + (S _mrpfH / L _A ) (11)
Comparing unit 26g compares the value of thrust F _PL determined in this manner, the rated output of the excavator 10. The rated output (maximum traverse force) of the excavator 10 employed in this embodiment is 55 t.

Next, the excavation efficiency evaluation unit 26h divides the thrust F _PL : 26.5t obtained by calculation by the rated output. Therefore, 26.5 / 55 = 0.48.

  As shown in FIG. 9, the excavation efficiency evaluation unit 26h replaces the obtained 0.48 (48% of the rated output) with a dimensionless number 48 and displays it as an evaluation value in the evaluation value output column C12 of the CRT 26i. At the same time, an evaluation symbol “◎” is displayed as a criterion for determining whether or not excavation is possible. The criteria for judging whether or not excavation is possible is expressed in four stages “◎”, “○”, “△”, and “×”, and “◎” indicates that “maximum estimated traverse force <maximum traverse force of the excavator specification” “O” means average estimated lateral force <maximum lateral force of excavator specification, “△” means minimum estimated lateral force <maximum lateral force of excavator specification, “×” means minimum estimated lateral force> Each is displayed selectively when it is the maximum traverse force of the excavator specification.

  In the graph shown in FIG. 10, the horizontal axis represents the evaluation value and the vertical axis represents the natural excavation traversing speed, and the actual results of the natural excavation traversing speed collected for each excavation site are plotted. For example, when the evaluation value is obtained by the above calculation, if the approximate value m obtained by plotting the actual transverse speed value corresponding to the evaluation value 48 is obtained, the transverse speed that can be set for performing the excavation work as scheduled is determined. I can know.

  As shown in FIG. 3, the excavation data at each excavation site is sequentially stored in the database 26a of the management server 26 via the network, so the number of plots of the ground excavation traverse speed results increases as the number of construction sites increases. Accordingly, the approximate curve m more accurately represents the relationship between the evaluation value and the excavation traverse speed.

  The above-described underground continuous wall construction support method supports the construction method during excavation. Next, a description will be given of a curing work support method performed at the end of the daily excavation work.

  FIG. 11 shows the controller 30 mounted on the excavator 10 and its peripheral devices.

  A pointing device 31, a multistage inclinometer measuring unit 32, an absolute position measuring unit 33, and a mechanical load measuring unit 34 are connected to the input side of the controller 30, and a CRT 35 and a communication device 36 are connected to the output side.

  The pointing device 31 is for inputting various commands to the controller 30 by indicating an icon displayed on the screen of the CRT 35.

  The multi-stage inclinometer measuring unit 32 is configured by four inclinometers 32a to 32d arranged in the depth direction of the cutter post.

  The absolute position measuring unit 33 includes a position sensor 33a, and the distance between the natural ground when the cutter post is moved away from the natural ground during the curing work and the distance between the generated end surface when the cutter post is moved away from the surface where the soil cement wall E is formed. Are each output as a signal.

  The mechanical load measuring unit 34 includes a cylinder pressure sensor 34a that detects a head-side pressure of an elevating slide cylinder that raises and lowers the cutter post, and a cutter that detects the pressure of the cutter, specifically, the operating pressure of a hydraulic motor that drives the cutter. And a pressure sensor 34b.

  Further, in the controller 30, the separation distance calculation unit (measurement unit) 30a calculates (measures) the ground clearance distance when the cutter post is moved away from the ground by receiving the signal output from the position sensor 33a.

  The measured natural ground separation distance is given to the determination unit 30b, and it is checked whether or not it exceeds the standard natural ground separation distance stored in the standard distance memory (curing setting value storage unit) 30c. In the present embodiment, the standard separation distance is set to 0.50 m.

  When it is determined that the measured natural ground separation distance exceeds the standard natural ground separation distance, the separation distance calculation unit 30a continuously receives the signal output from the position sensor 33a and moves the cutter post away from the created end face. The calculated end face separation distance is calculated (measured). If the natural ground separation distance does not exceed the standard natural ground separation distance, it is not possible to proceed to the next step of checking the created end surface separation distance.

  The determination unit 30b checks whether the measured created end surface separation distance exceeds the standard created end surface separation distance stored in the standard distance memory 30c, and if it exceeds, the in-plane inclination calculating unit (measurement unit) continues. ) The 30d process is started. If it is determined that the created end face separation distance does not exceed the standard created end face separation distance, it is not possible to proceed to the next step as described above.

  The in-plane inclination calculation unit 30d receives (outputs) signals from the various inclinometers 32a to 32d of the multistage inclinometer measurement unit 32 and calculates (measures) the in-plane inclination angle of the cutter post.

  The calculated in-plane inclination angle is given to the determination unit 30e, and it is checked whether it is below the standard in-plane inclination angle stored in the standard inclination memory 30f. In this embodiment, the in-plane inclination angle is set to 0.2 °.

  If the determination unit 30e determines that the inclination angle is below the standard in-plane inclination angle, the determination unit 30e instructs the curing processing unit 30g to start the curing operation.

  The curing treatment unit 30g performs the curing work by repeatedly raising and lowering the cutter post while rotating the cutter.

  The cutter post pulling force and cutter pressure at the time of the curing work, the above-mentioned ground clearance distance, the created end surface separation distance, and the in-plane inclination angle are respectively stored in the curing data memory 30h and also given to the monitor screen display control unit 30i. Are displayed numerically on the CRT 35 screen.

  FIG. 12 shows a curing work screen displayed on the CRT 35.

  In the figure, on the screen, a button 35a for checking the distance from the natural ground to the cutter post, a button 35b for checking the distance from the created end surface to the cutter post, and an in-plane inclination of the cutter post are checked. Button 35c, curing start button 35d, curing termination button 35e, and termination button 35f are prepared. Each of these buttons can be pressed on the screen by the pointing device 31.

  Further, an in-plane monitor image 35g and an out-of-plane monitor image 35h of the cutter post are displayed on the right side of the screen, respectively, and the displacement amount at each part of the cutter post in the depth direction is monitored.

  Curing work is performed according to the description written on each button 35a on the screen.

  First, when the button 35a is pressed, the distance from the natural mountain end face is measured and recorded. In this case, since 0.56 m> 0.50 m (standard ground clearance distance), it is determined to be OK.

  Next, when the button 35b is pressed, the distance from the created end face is measured and recorded. In this case, since 4.56 m> 2.8 m (standard ground clearance distance), it is determined to be OK.

  Next, when the button 35c is pressed, the in-plane inclination angle is measured and recorded. In this case, since it is 0.00deg <0.2deg (standard in-plane inclination angle), it is determined as OK.

  Curing work can be started when each above determination result is OK. Then, when the button 35d is pressed, the curing work is started, and the drawing force and the cutter pressure of the cutter post are measured and recorded.

  The performed curing work is terminated by pressing the button 35e, and the routine proceeds to daily routine construction termination processing by pressing the button 35f.

  In this way, each process of the curing work is executed according to the guidance on the screen, and each process of the curing work is checked for each process, so the operator can proceed with the curing work reliably and safely without relying on experience. .

  Next, a description will be given of a method for supporting the edge cutting work performed before the start of the next day's excavation work.

  When performing the edge cutting operation, when the cutter post is moved up and down at a slow speed, the extraction force calculation unit (measurement unit) 30j receives (signals) output from the elevating slide cylinder pressure sensor 34a and calculates (measures) the extraction force of the cutter post. .

  The calculated pulling force is given to the determination unit 30k, and it is determined whether or not the maximum pulling force stored in the maximum pulling force memory 30l has been reached. That is, if the operating pressure detected by the elevating slide cylinder pressure sensor 34a is equal to or less than the maximum pulling force, it is considered that the cutter post has operated in a normal state, and if the maximum pulling force has been reached, it is determined that there has been no slight operation. If the cutter post does not operate, it is not possible to proceed to the next step.

  When it is determined that the cutter post has been operated, the cutter is rotated at a slow speed and the processing of the cutter pressure calculation unit (measurement unit) 30m is started.

  The cutter pressure calculation unit 30m calculates (measures) the cutter pressure output from the cutter pressure sensor 34b.

  The calculated cutter pressure is given to the determination unit 30n, and it is determined whether or not the maximum cutter pressure stored in the maximum cutter pressure memory 30p has been reached. That is, if the cutter pressure detected by the cutter pressure sensor 34b is equal to or less than the maximum cutter pressure, the cutter is regarded as operating in a normal state.

  When the rotation of the cutter is confirmed, the determination unit 30n instructs the edge cutting processing unit 30q to start the edge cutting operation.

  The edge cutting processing unit 30q performs the edge cutting work by finely operating the cutter post and further driving the cutter. The cutter post pulling force, cutter pressure, and working time during the edge cutting operation are stored in the edge cutting data memory 30r, and are given to the monitor screen display control unit 30i and displayed numerically on the screen of the CRT 35. .

  FIG. 13 shows a border cutting work screen displayed on the CRT 35.

  In the figure, on the screen, a button 35i for finely pulling out, a fine movement OK button 35j, a non-fine movement button 35k, a cutter fine movement start button 35l, a fine movement OK button 35m, a border cutting operation start button 35n, a border cutting operation A work end button 35p and a construction mode change button 35q are prepared.

  On the right side of the screen, the amount of displacement of the cutter post is monitored as in FIG.

  The border cutting operation is performed in accordance with the description written on each button on the screen.

  First, when the button 35i is pressed, the cutter post is moved up and down at a slow speed without rotating the cutter, and the drawing start time is recorded. In this case, since the pulling force is 65t <70t (maximum pulling force), the fine movement OK button 35j can be pressed. If the fine movement is not performed, the maximum pulling force is recorded by pressing the button 35k without performing a fine movement, and then the next cutter rotation operation is started.

  When the fine movement OK button 35j is pressed, the drawing end time is recorded, and the cutter fine movement start button 35l can be pressed. When the cutter fine movement start button 35l is pressed, the cutter pressure is measured. In this case, since the cutter pressure is 10t <24t (maximum cutter pressure), the fine movement OK button 35m can be pressed, and the cutter fine movement end time is recorded. .

  In general, even when there is no fine movement in the initial lifting operation, the earth and sand are agitated by the rotation of the cutter, the adhesive force is reduced, and the lifting operation can be performed.

  Next, by pressing the fine movement OK button 35m, it becomes possible to press the edge cutting start button 35n. When the cutter fine movement starting button 351 is pressed, the edge cutting operation is started.

  In the edge cutting operation, the lifting operation of the cutter post is repeatedly executed while alternately reversing the rotating direction of the cutter. The pulling force and cutter pressure of the cutter post at this time are measured, and each data is stored in the edge cutting data memory 30r.

  The edge cutting operation is ended by pressing the button 35p, and when the button 35q is pressed, the next construction mode can be entered.

  Each data collected in the curing data memory 30h and the margin cutting data memory 30r collected at the time of the above-described curing operation and margin cutting operation is transmitted to the management server via the transmission processing unit 30s and the communication device 36.

Further, the transition of the curing work and the edge cutting work can be displayed on the screen of the CRT 35. Taking the edge cutting operation as an example, as shown in FIG. 14, the evacuation distance from the created end face collected _{every day} is displayed as a graph L ₁ .

Pullout force of the front edge switching is displayed as a graph L _2, pull-out force after edge switching is displayed as a graph L _3.

The tangential force before edge cutting is displayed as a graph L ₄ , and the tangential force after edge cutting is displayed as a graph L ₅ .

  If the transition of the edge cutting effect is displayed in a graph in this way, for example, when the edge cutting effect is high, it is possible to improve construction efficiency, for example, by quickly cutting up the edge cutting work and moving to excavation work.

It is a schematic block diagram of the excavator used with the construction assistance system of this invention. It is explanatory drawing which shows the excavation model of an excavator. 1 is an overall configuration diagram of a construction support system of the present invention. It is explanatory drawing which shows an excavation mode selection screen. It is a block diagram which shows the structure of an underground continuous wall construction management server. It is explanatory drawing which shows the ground condition input cell and construction condition input cell which were displayed on the CRT screen. It is explanatory drawing which shows the ground property input cell displayed on the CRT screen. It is explanatory drawing which shows the excavation model regarding excavator transverse force. It is explanatory drawing which shows the ground performance estimation result displayed on the CRT screen. It is a graph which shows the relationship between an evaluation value and excavation transverse speed results. It is a block diagram which shows the structure of the controller mounted in the excavator of this invention. It is explanatory drawing which shows the monitor screen of curing work. It is explanatory drawing which shows the monitor screen of border cutting work. It is a graph which shows transition of border cutting work. It is a schematic block diagram of the conventional excavator. (A)-(d) is process drawing explaining the conventional excavation construction method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Excavator 11 Base machine 12 Chain cutter 13 Cutter post 14 Ground injection agent discharge port 15 Traverse upper cylinder 16 Traverse lower cylinder 20-23 Antenna 24 Relay station 25 Provider 26 Underground continuous wall construction management server 27 Provider 28-31 Computer

Claims (5)

It is a construction support method for underground continuous wall construction that is performed by inserting a cutter post equipped with a drilling tool into the ground and moving the cutter post laterally while operating the drilling tool to form a drilling groove. And
For the cutter post edge cutting work to be carried out before starting the daily excavation work, the cutter post extraction load and the excavator mechanical load are measured, and the above-mentioned extraction load and mechanical load as measurement data are set in advance. A construction support method for underground continuous wall construction, wherein the suitability of the edge cutting work is judged by comparing with each set value.   The construction support method for underground continuous wall construction according to claim 1, wherein the suitability of the edge cutting operation is determined for each step performed in the edge cutting operation.   The construction support method for underground continuous wall construction according to claim 1 or 2, wherein the measurement data is stored in time series, and the transition of the edge cutting work is output in a graph. An excavator that forms a excavation groove by inserting a cutter post equipped with a drilling tool into the ground and moving the cutter post laterally while operating the drilling tool,
For the cutting operation of the cutter post that is carried out before starting the daily excavation work, the measuring unit that measures the drawing load of the cutter post and the mechanical load of the excavator and the set value as the appropriate cutting condition are stored. The edge cutting setting value storage unit, the edge cutting data measured by the measuring unit, and the edge cutting setting value stored in the edge cutting setting value storage unit are compared to determine whether the edge cutting operation is appropriate. An excavator comprising: a determination unit configured to perform. A construction support system for underground continuous wall construction in which a cutter post equipped with a drilling tool is inserted into the ground, and the cutter post is moved laterally while operating the drilling tool to form a drilling groove.
An excavator according to claim 4;
A management computer connected to the excavator via a network;
The management computer has a database,
The database accumulates data measured at the edge cutting work performed when starting excavation work at each site, and transmits information accumulated in the database in response to a request from the excavator. Construction support system for underground continuous wall construction characterized by being constructed.

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