JP4411643B1 - Waste mud recovery method and waste mud recovery device for high-pressure injection system ground improvement - Google Patents

Abstract

[PROBLEMS] To prevent the occurrence of a very serious situation such as the inability to use an existing structure in the improvement of the high-pressure injection system in the ground directly under or around the existing structure. Provided is a waste mud recovery method using an apparatus that recovers without leaking to the surroundings and a waste mud recovery apparatus.
SOLUTION: Using a high pressure injection system ground improvement construction machine 1, a tube rod 5 is inserted into a hole excavated directly under an existing structure or in the surrounding ground, and a hardened material is filled therein, and a cylindrical solid body is filled in the ground. In addition to the ground improvement, the bottom plate 11 is provided with a bowl-shaped waste mud receiving tank 2 which is connected to the upper end of a hole excavated in the ground so as to be sealed with a tube structure sealing material 14. The receiving tank 2 is arranged in the lower part of the construction machine 1, and when the mud receiving tank 2 is pressed from above by the construction machine 1 to cut the ground, the discharged mud receiving tank is not leaked to the surroundings. 2 is a waste mud recovery method using a waste mud recovery device to be taken in.
[Selection] Figure 2

Description

  The present invention provides a high-pressure injection system for ground improvement in an airport runway or taxiway, a road through which automobiles pass, or an existing structure such as an oil storage tank facility or a port facility, and the surrounding ground. More particularly, the present invention relates to a method for recovering mud in a high-pressure injection system ground improvement using a mud collecting device that allows the discharged mud to be taken into a waste mud receiving tank without leaking to the surroundings, and the mud collecting device.

  Conventionally, this is an example of high-pressure injection ground improvement to prevent liquefaction phenomenon directly under and around existing structures such as runways and taxiways at airports. As a certain cross jet type high pressure injection system ground improvement, as shown in FIG. 8, using a high pressure injection system ground improvement construction machine 40, a tube rod 41 having a triple pipe structure is inserted into a hole excavated by a casing pipe, After the insertion, while rotating the tube rod 41, the tube rod 41 is gradually pulled upward, and the high pressure jet water wj is sprayed from the two upper and lower portions of the tip so as to intersect with each other. Cutting is performed so as to destroy the ground with high-pressure jet water wj. In addition, in the two high-pressure jet waters wj that intersect, after the intersection, that is, the collision, the ground breaking energy is rapidly reduced, so that the ground is not cut, thereby cutting at a desired size. Is called. Then, a hardened material s such as cement milk is sprayed from the tip of the tube rod 41 to a place cut by the high-pressure jet water wj, and the hardened material s is filled in the hardened material s. Create body K. In this way, a cylindrical solid body K having a desired size is created in the ground to strengthen the ground, thereby preventing a liquefaction phenomenon directly under the existing structure or in the surrounding ground. What was made was known.

  Moreover, as such a cross jet type high pressure injection system ground improvement, the same thing is shown also in Unexamined-Japanese-Patent No. 8-41859, This also has two cross | intersecting from the tube rod inserted in the ground. High pressure jet water is jetted wj to cut the ground, and a hardened material s such as cement milk is jetted and filled therein, thereby forming a cylindrical solid body K in the ground.

  And in these cross jet type high pressure injection system ground improvement, two intersecting high pressure jet waters wj are jetted to cut the ground, but when the ground is cut, the cut ground is slurry-like. The mud was discharged from the hole. In order to prevent the ejected slurry-like waste mud m from being scattered around, the waste mud collection pipe 42 is provided.

  As shown in FIG. 9, the sludge collecting pipe 42 is provided with a vertical stand pipe 43 attached to the hole and an L-shaped pipe connected to the upper part thereof below the high-pressure injection system ground improvement construction machine 40. 44 and a horizontal drain pipe 45 connected to the L-shaped pipe 44. The drain pipe 45 extends long and is connected to a tank at a distance. Further, by ejecting compressed air into the drain pipe 45, the discharged mud flows along the stand pipe 43, the L-shaped pipe 44, and the drain pipe 45 to be carried to the tank. In addition, the mud collected in the tank is carried out by a mud collection vehicle.

JP-A-8-41859

  In the conventional high-pressure injection system improvement directly under and around the existing structure, when the ground is cut, the mud ejected from the holes flows into the mud collection pipe. In the case of mud, in the case of ground where different soil types are laminated, such as soft soil to hard soil, the amount of discharged mud differs completely depending on the soil, and a large amount of discharged mud may be ejected suddenly. In addition, garbage and wood chips buried in the ground were often mixed. In this way, a large amount of waste mud may be ejected or dirt or wood chips may be mixed into the waste mud, which may cause clogging of the waste mud recovery pipe and make it impossible to discharge the mud in the waste mud recovery pipe. was there.

  And when clogging occurs in the waste mud recovery pipe in this way, the waste mud stops being ejected from the hole, and the inside of the hole is sealed, so that the high pressure jet water can be normally ejected from the pipe rod. It becomes impossible, and the problem that the ground cannot be cut with high-pressure jet water occurs. In addition, due to clogging of the sludge collection pipe, the sludge may leak at the upper end of the hole and scatter to the surroundings. The leaked mud leaks, particularly in existing structures such as runways and taxiways at airports. In the case of things, even if a small amount of mud leaks out, the runway or taxiway gets dirty, and it is difficult to remove this dirt, which may cause problems in the arrival and departure of airplanes at the airport. there were.

  In addition, once the mud collection pipe is clogged, it is necessary to disassemble all parts such as stand pipes and drain pipes in the mud collection pipe, and to clean and repair them. The clogging that occurs in the pipeline cannot be resolved. For this reason, in the ground improvement directly under existing structures such as runways and taxiways at airports, avoid the arrival and departure times of airplanes during the day and avoid late hours so that they do not interfere with arrival and departure of airplanes. Completing the work within a predetermined time was an absolute requirement, but this could not be done and could cause a very serious situation that would stop the arrival and departure of the airplane at the airport.

  In view of such a conventional problem, the present invention enables the improvement of the ground within a predetermined time without problems in the high pressure injection system ground improvement directly under the existing structure or the surrounding ground, and the use of the existing structure. In order to prevent the occurrence of an extremely serious situation such as making it impossible to use the existing structure, it is possible to prevent the mud discharged from the hole from leaking to the surroundings. It is an object of the present invention to provide a waste mud recovery method in a high-pressure injection system ground improvement using a waste mud recovery device that is to be taken in and a waste mud recovery device.

The first invention uses a high-pressure injection system ground improvement construction machine to insert a tube rod into a hole drilled directly under an existing structure or in the surrounding ground, and injects high-pressure jet water from the tube rod. While cutting the ground with high-pressure jet water, the hardened material is sprayed from the tip of the tube rod to the place cut by the high-pressure jet water, and filled with the hardened material here, thereby forming a cylindrical solid solid in the ground. Made of a rubber material that can cope with a wide range of irregularities on the ground surface at the upper end of the hole excavated in the ground in the improvement of the high pressure injection system ground directly under the existing structure and surrounding ground by creating a tie provided with a hollow tub-shaped hydro receiving vessel which is formed in the bottom plate a hole for connecting to seal the tube structure sealing material is a cylindrical tube, high-pressure injection system ground improvement construction machine this waste sludge receiving tank Place the mud receiving tank in the lower part of the ground and press down the mud receiving tank from above with a high pressure injection system ground improvement construction machine, and when cutting the ground, the mud receiving tank does not leak to the surroundings. It is a waste mud recovery method in the high pressure injection system ground improvement using the waste mud recovery device which comes in.

  According to a second aspect of the present invention, in the waste mud recovery apparatus described in the first aspect of the present invention, a lid having a hole portion into which a tube rod can be inserted is provided at the upper part of the waste mud receiving tank. Attach a special rod cover to prevent a gap from being formed between the tube rod and the hole in the body, so that the mud discharged from the hole is not scattered by the lid and the rod special lid. It is the waste mud recovery device in the high pressure injection system ground improvement.

  According to a third aspect, in the second aspect, the special lid for the rod includes a flexible plate disposed below the lid, a plurality of flexible plates and steel disposed above the lid. In addition to the multi-layer structure combined with the presser lid, in the case of multiple plates placed above the lid, a large number of cuts are made radially from the hole for inserting the tube rod formed at the center. This is a sludge recovery device for improving the high-pressure injection system ground, in which a large number of cuts to be inserted radially do not overlap the cut positions in a plurality of plates.

  According to the first invention, a mud receiving tank of the mud collecting device is provided on the hole excavated in the ground, and the mud discharged from the hole is taken into the mud receiving tank. Even if there is a discharge of waste mud, or if there is dirt or wood chips in the waste mud, there is no trouble such as clogging, and the exhaust mud can be discharged well and always discharged from the hole. Can be easily observed by the mud receiving tank, and the working situation at that time can be easily grasped. As a result, it is possible to improve the high-pressure injection system ground directly under the existing structure or in the surrounding ground.

  This is because drainage can be satisfactorily discharged from the hole excavated in the ground, so that the inside of the hole is not sealed, and high pressure jet water injection from the tube rod can be performed normally, Ground cutting with high-pressure jet water can always be performed satisfactorily. Moreover, the bottom plate of the waste mud receiving tank and the ground surface can be closely adhered by the tube structure sealing material, the waste mud does not leak from here, and the surroundings can be prevented from becoming dirty, For existing structures such as runways and taxiways at airports, even if a small amount of mud leaks out, it will be a major problem, but this tube structure sealing material will also prevent a small amount of mud from leaking out. So, it is possible to eliminate the obstacle to the arrival and departure of airplanes at the airport.

  In addition, by eliminating troubles such as clogging in the discharge of mud discharged from the hole, for example, in the improvement of high pressure injection system ground directly under existing structures such as runways and taxiways at airports. As much as possible, it is possible to reliably complete the work within a predetermined time from midnight to early morning, and to prevent the occurrence of a very serious situation such as stopping the arrival and departure of the airplane at the airport.

  Furthermore, by pressing the waste mud receiving tank of the waste mud recovery device from above with the high-pressure injection system ground improvement construction machine, even if the mud is ejected vigorously from the hole, the mud receiving tank can move at all. Since it is always installed on the ground surface in a stable state, troubles such as leakage of waste mud at the lower side of the waste mud receiving tank can be eliminated.

  Further, according to the second invention, in the waste mud collecting apparatus, the lid body is provided on the upper part of the waste mud receiving tank, and a special lid for the rod is attached to the lid body so that the waste mud ejected from the hole is provided. By preventing the lid and the special lid for the rod from splashing around, troubles such as leakage of waste mud on the upper side of the waste mud receiving tank can be eliminated.

  Further, according to the third invention, the special lid for the rod has a multi-layer structure including a plurality of flexible plates, and in the plurality of flexible plates, by making a large number of cuts, It is possible to eliminate the gap with the tube rod and prevent the mud from leaking out while preventing the inserted tube rod from rotating, and the operation can be performed very well.

  In addition, since a large number of cutting positions that are radially inserted in the plurality of plates in the special lid for the rod are not overlapped, the leakage of waste mud from here can be completely prevented.

It is a front view explaining the sludge collection | recovery apparatus in the high pressure injection system ground improvement of this invention, and a high pressure injection system ground improvement construction machine. It is a side view explaining the sludge collection | recovery apparatus and high pressure injection system ground improvement construction machine in the high pressure injection system ground improvement of this invention. FIG. 2 is a detailed view of a part A in FIG. 1. It is a side view explaining the waste mud receiving tank of the waste mud recovery apparatus in the high pressure injection system ground improvement of this invention. It is a top view explaining the waste mud receiving tank of the waste mud recovery apparatus in the high pressure injection system ground improvement of this invention. It is a front view explaining the partition plate of the waste mud receiving tank of the waste mud recovery apparatus in the high pressure injection system ground improvement of this invention. It is a disassembled perspective view explaining the special lid for rods of the sludge receiving tank of the sludge collecting apparatus in the high pressure injection system ground improvement of the present invention. It is the schematic explaining the conventional cross jet type high pressure injection system ground improvement. It is a front view explaining the conventional high-pressure injection system ground improvement construction machine and a waste mud recovery pipeline.

An embodiment of a waste mud recovery method and its waste mud recovery device in the improvement of the high-pressure injection system ground according to the present invention will be described.
The high-pressure injection system ground improvement construction machine 1 used for the improvement of the high-pressure injection system ground directly under the existing structure and the waste mud receiving tank of the waste mud recovery device will be described as shown in FIGS. 1 to 3. The ground improvement work machine 1 is composed of a machine body 3 and a gantry 4, and the machine body 3 is provided with various power sources as well as a rotating device and a propulsion device. 3, a casing pipe or a tube rod 5 having a triple-pipe structure is inserted into the ground.

  Further, the gantry 4 is provided at the lower part of the machine main body 3, and the machine main body 3 is placed on the upper part thereof.

  As shown in FIGS. 4 to 6 together with FIGS. 1 to 3, the waste mud receiving tank of the mud recovery apparatus is provided at the lower portion of the base 7 of the gantry 4 in the high-pressure injection system ground improvement construction machine 1. Thus, the mud receiving tank 2 is formed in a rectangular bowl shape from the bottom plate 11 and the surrounding side plates 12, and a hole 13 is formed in the bottom plate 12. In addition, a casing pipe and a tube rod 5 can be inserted into the hole 13 formed in the bottom plate 12, and a ring-shaped tube structure sealing material 14 is provided around the upper end of the hole excavated in the ground. Connect.

  This tube structure sealing material 14 is a hollow cylindrical tube made of a rubber material. By filling the inside with air, the tube structure sealing material 14 can cope with a wide range of unevenness from several mm unevenness to several cm unevenness on the ground surface. In this way, the bottom plate 12 of the mud receiving tank 2 and the ground surface are brought into close contact with each other without any gaps, so that the leakage of the mud here is surely prevented. In particular, on runways and taxiways at airports, although there are many irregularities of several centimeters on the ground surface, the tube structure sealing material 14 ensures the bottom plate 12 of the mud receiving tank 2 and the ground surface. It is possible to make it adhere closely to the sewage and eliminate the leakage of mud.

  Further, a partition plate 15 is provided in the middle of the waste mud receiving tank 2 to distinguish the mud collection chamber 16 and the storage chamber 17. An inlet 18 is formed in the upper part of the partition plate 15 so that the mud discharged from the hole flows from the mud collecting chamber 16 to the storage chamber 17 through the inlet 18.

  And the upper part of this waste mud receiving tank 2 is equipped with the cover body 21, and this cover body 21 is a set of 2 sheets, and the upper part of the mud collection chamber 16 in the waste mud receiving tank 2 by these two cover bodies 21. In this way, the mud discharged from the hole is prevented from scattering around. Further, a hole 22 into which the tube rod 5 or the like can be inserted is formed in one of the two lids 21, and a special rod cover 23 is attached to the hole 22.

  As shown in FIG. 7, the rod special lid 23 is disposed above the lid body 21 and a flexible plate 31 made of a rubber material disposed below the lid body 21 provided on the upper part of the mud receiving tank 2. A flexible structure is formed by combining flexible plates 32 and 33 made of two rubber materials and a steel presser lid 34 disposed above the plates. Further, the two plates 32 and 33 and the steel presser lid 34 disposed above the lid body 21 are fixed to the lid body 21 with bolts. In the two plates 32 and 33 disposed above the lid body 21, the holes 32 a and 33 a for inserting the tube rod 5 are formed in the center of the two plates 32 and 33. Specifically, eight notches 32b and 33b are provided at equal intervals in a radial manner. Specifically, in order to prevent the notches 32b and 33b from being radially provided from overlapping the notches in the two plates 32 and 33, The cut 32b of the plate 32 and the cut 32b of the plate 33 are positioned between the cuts 32b and 33b. Further, in the steel presser lid 34, a lid main body 35 having a large hole 35a formed in the center thereof, and a pair of slide lids 36 that move laterally along a guide plate 35b provided in the lid main body 35, A semicircular recess 36 a is formed at the tip of the slide lid 36. Then, when desired, a pair of slide lids 36 are inserted and attached to the lid body 35 from the side, so that the two plates 32 and 33 positioned below the plates are firmly supported from above. It should be noted that the notches 32b and 33b to be inserted into the two plates 32 and 33 are not limited to eight, and may be six, or a plurality of such as ten or twelve. Further, the plates 32 and 33 arranged above the lid 21 are not limited to two, and may be two or more.

  In the rod special lid 23 having such a structure, it is possible to closely contact the tube rod 5 inserted therein in an optimum state. This is because, by inserting a large number of cuts 32a and 33a into the two flexible plates 32 and 33 in the special lid 23 for the rod, the rotation of the inserted tube rod 5 can be smoothly performed. In addition, the gap with the tube rod 5 can be eliminated to prevent the leakage of waste mud from here. Moreover, since the incision positions of the multiple incisions 32b and 33b that are radially inserted in the two flexible plates 32 and 33 are not overlapped, it is possible to completely prevent the leakage of waste mud. The exhaust mud ejected from the hole in the ground is ejected vigorously along the outer periphery of the tube rod 5 by the air lift action. This ejected exhaust mud is for the rod including the two flexible plates 32 and 33. The special lid 23 can reliably suppress the leakage of the mud.

  In the mud receiving tank 2 of such a mud collecting apparatus, the edge of the lid 21 provided on the upper part of the mud collecting tank 2 is pressed against the base 7 of the gantry 4 of the high pressure injection system ground improvement construction machine 1 through the steel material 24 for pressing. Pressed from above, in short, the high-pressure spray system ground improvement construction machine 1 is designed to hold down the mud receiving tank 2 from above, so that the mud receiving tank 2 does not move to the ground surface at all. Can be installed at. Moreover, a ring-shaped tube structure seal interposed between the bottom plate 11 of the mud receiving tank 2 and the periphery of the hole in the ground by pressing the mud receiving tank 2 from above with the high-pressure injection system ground improvement construction machine 1. The material 14 can be deformed corresponding to the unevenness on the ground surface to bring the bottom plate 11 of the mud receiving tank 2 and the ground surface into close contact with each other, whereby the hole 13 formed in the bottom plate 11 of the mud receiving tank 2 and the ground By connecting the upper end of the excavated hole in a sealed state, the discharged mud can be prevented from leaking from here.

  Next, the high-pressure injection system ground improvement directly under the existing structure and the surrounding ground and the waste mud recovery method in the high-pressure injection system ground improvement will be described. First, the high-pressure injection system ground improvement is a cross jet type high-pressure injection system ground improvement, but is not limited to this, and other high-pressure injection system ground improvement such as jet grout type high-pressure injection system ground improvement. But it ’s okay. The existing structure is a runway or taxiway at the airport, and the specific construction site is a manhole existing on the runway or taxiway, but is not limited to these locations.

  A high pressure injection ground improvement construction machine 1 and a waste mud receiving tank 2 of a waste mud recovery device are installed on the ground surface of a runway or taxiway at the airport of the construction site. First, the mud receiving tank 2 is placed on the ground surface according to the hole of the manhole. At this time, the positions of the hole of the manhole and the hole 13 formed in the bottom plate 11 of the mud receiving tank 2 are aligned, and the hole 13 of the mud receiving tank 2 is formed in a ring-shaped tube structure at the upper end of the hole of the manhole. The sealing material 14 is connected in a sealed state. In addition, by connecting in a sealed state with the ring-shaped tube structure sealing material 14 in this way, it is possible to prevent the mud from leaking from here.

  Then, a hole is made in the bottom of the manhole, and a cylindrical stand pipe 25 is embedded therein.

  On the other hand, the machine main body 2 of the high-pressure injection system ground improvement construction machine 1 is installed above the hole of the manhole. First, the gantry 4 of the high-pressure injection system ground improvement construction machine 1 is installed. At this time, the sewage receiving tank of the mud recovery device in which the base 7 of the gantry 4 of the high-pressure injection system ground improvement construction machine 1 is located below. The second lid 21 is pressed from above via a pressing steel member 24. And the machine main body 3 is installed on the base 7 in the installed base 4.

  In this way, the high-pressure injection system ground improvement construction machine 1 including the machine main body 3 and the gantry 4 and the waste mud receiving tank 2 of the waste mud collecting device are installed on the ground surface of the runway or taxiway at the construction site airport.

  After installing the high-pressure injection system ground improvement construction machine 1 and the waste mud receiving tank 2 of the waste mud recovery device on the ground surface, a casing pipe is attached to the machine body 3 in the high-pressure injection system ground improvement construction machine 1, and the ground is formed by this casing pipe. A hole having a predetermined depth is perforated.

  And after inserting the pipe rod 5 of a triple pipe structure to the predetermined depth in the casing pipe inserted in the ground, and inserting, the casing pipe is pulled out. Next, the rod special lid 23 having the tube rod 5 penetrated is attached to the upper part of the mud receiving tank 2, and the upper part of the mud receiving tank 2 is closed with the lid body 21 and the rod special lid 23.

Then, two high-pressure jet waters that intersect while rotating the tube rod 5 by the machine main body 3 of the high-pressure injection system ground improvement construction machine 1 while gradually pulling the tube rod 5 upward are injected. By cutting so as to destroy the ground with high pressure jet water, cutting at a desired size is performed. The high-pressure jet water for cutting the ground has a very high pressure of about 400 kg / cm ² .

  Simultaneously with the cutting of the ground with the high-pressure jet water, a hardened material such as cement milk is sprayed from the tip of the tube rod 5, and the hardened material is filled in the cut place, so that a cylindrical solidified in the ground. Build your body.

  At this time, the cut ground becomes slurry-like waste mud and is ejected from the hole. The ejected waste mud is the waste mud collected by the waste collection equipment installed on the ground surface of the runway and taxiway at the airport. It is designed to be taken into the receiving tank 2, and the mud receiving tank 2, the lid body 21 and the special lid for rod 23 prevent the mud discharged from the hole from being scattered around. In this way, the mud discharged from the hole is collected into the mud receiving tank of the mud collecting device without leaking to the surroundings, thereby collecting the mud.

  Further, the waste mud taken into the waste mud receiving tank 2 is carried to the tank by a vacuum hose, and the waste mud collected in the tank is carried out by a waste mud collecting vehicle. In addition, you may make it carry out the waste mud in the waste mud receiving tank 2 with a waste mud collection vehicle directly.

  Then, after the tube rod 5 is pulled out, the tip injection nozzle is replaced, the tube rod 5 is inserted again, and a special agent having a short-term curing action that accelerates hardening is injected from the tip of the tube rod 5. Thus, the solidified body formed in the ground is cured in a short time.

  And after pulling out the pipe rod 5, the machine main body 3 and the mount frame 4 of the high-pressure injection system ground improvement construction machine 1 are each removed, and the waste mud receiving tank 2 is also removed. Thereafter, the upper part of the excavated hole is filled, and a series of operations is completed.

  In this way, a cylindrical solid body having a desired size is created in the ground to strengthen the ground, thereby preventing liquefaction phenomenon directly under the existing structure or in the surrounding ground. To improve the high pressure injection ground for this purpose, the liquefaction of the ground is prevented and the problem of serious damage to existing structures is eliminated.

  In addition, these series of ground improvement can be performed in about 2 hours, and the solidified body formed in the ground can be hardened in a short time, so that it can run at the airport in about 3 or 4 hours. It is possible to use existing structures such as roads and taxiways. As a result, the improvement of the ground directly under and around the existing structures such as runways and taxiways at the airport can be completed within a set time from midnight to early morning. It is possible to eliminate the occurrence of a very serious situation such as stopping.

  Further, the amount of mud ejected from the hole can be measured in the mud receiving tank 2. This is because the partition plate 15 is provided in the waste mud receiving tank 2, so that the mud collecting chamber 16 and the storage chamber 17 are distinguished from each other in the mud receiving tank 2. It is possible to measure the amount of discharged mud by measuring the amount of the discharged mud flowing through the upper inlet 18 of the 15, specifically by measuring the time to reach a predetermined amount in the storage chamber 16. Is. In this way, by measuring the amount of waste mud ejected from the hole, or by observing the situation of dirt and wood chips mixed in the waste mud, it is possible to easily grasp the work situation including the ground condition, The ground is always improved in an optimal state according to the work situation.

  DESCRIPTION OF SYMBOLS 1 ... High pressure injection system ground improvement construction machine, 2 ... Waste mud receiving tank, 3 ... Machine main body, 4 ... Mount, 5 ... Pipe rod, 6 ... Leg, 7 ... Base, 11 ... Bottom plate, 12 ... Side plate, 13 ... Hole , 14 ... Tube structure sealing material, 15 ... Partition plate, 16 ... Mud collection chamber, 17 ... Storage chamber, 18 ... Inlet, 21 ... Cover, 22 ... Hole, 23 ... Special lid for rod, 24 ... Pressing Steel, 25 ... Stand pipe, 31 ... Plate, 32 ... Plate, 32a ... Hole, 32b ... Cut, 33 ... Plate, 33a ... Hole, 33b ... Cut, 34 ... Steel presser lid, 35 ... Cover body, 35a ... Hole, 35b ... Guide plate, 36 ... Slide lid, 36a ... Recess, 40 ... Construction machine, 41 ... Pipe rod, 42 ... Waste mud recovery pipe, 43 ... Stand pipe, 44 ... L-shaped pipe, 45 ... Drain pipe

Claims (3)

Using a high-pressure injection system ground improvement construction machine, insert a tube rod into a hole drilled in the ground directly under or around the existing structure, inject high-pressure jet water from this tube rod, and use this high-pressure jet water to submerge the ground. While cutting, the hardened material is sprayed from the tip of the tube rod to the place cut by this high-pressure jet water, and by filling the hardened material here, a cylindrical solid body is formed in the ground. In the improvement of the high-pressure injection system ground directly under the existing structure and the surrounding ground,
Formed in the bottom plate at the top of the hole drilled in the ground is a hole that connects to the bottom plate with a tube- shaped sealing material that is a hollow cylindrical tube made of a rubber material that can accommodate a wide range of irregularities on the ground surface The sludge receiving tank is arranged at the bottom of the high pressure injection system ground improvement construction machine, and the waste mud receiving tank is pressed from above by the high pressure injection system ground improvement construction machine. The sludge recovery in the high-pressure injection system ground improvement is characterized by using the sludge recovery device that takes in the sludge ejected from the hole into the waste sludge receiving tank without leaking to the surroundings when cutting the ground Method.   In the waste mud recovery apparatus according to claim 1, a lid body in which a hole portion into which a tube rod can be inserted is provided at an upper portion of the waste mud receiving tank, and the tube rod is formed in the hole portion of the lid body. A special lid for rods is installed to prevent a gap from being formed between them and the mud discharged from the hole is prevented from splashing around by the lid and the special lid for rods. Waste mud recovery device for ground improvement of the injection system.   The rod special lid has a multilayer structure in which a flexible plate arranged below the lid, a plurality of flexible plates arranged above the lid, and a steel presser lid are combined. In a plurality of plates arranged above the lid, a large number of cuts are made radially from a hole for inserting a tube rod formed in the center thereof, and a plurality of cuts to be put in the radial form are provided. 3. The waste mud recovery apparatus for improving the high-pressure injection system ground according to claim 2, wherein the cut positions do not overlap each other on a single plate.

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