JP6343752B2 - Ground improvement device - Google Patents

Description

  The present invention relates to a ground improvement device for constructing a ground improvement body by jetting and stirring a solidified material liquid in a cutting region in the ground.

  Conventionally, a soft ground improvement method for solidifying and improving a soft ground by high-pressure jet stirring of a solidified material liquid is widely known. In this soft ground improvement method, a swivel is connected to the upper part of the injection pipe having a monitor mechanism at the lower part, this injection pipe is inserted from the ground to a predetermined depth in the ground, and then the solidification material is fed from the solidification liquid supply port of the swivel. The liquid is supplied at a high pressure, and the solidified material liquid is sprayed horizontally from the solidified material liquid spray nozzle at the lower part of the injection tube toward the outside of the tube, and the injection tube is rotated and pulled up. This makes it possible to build a ground improvement body by cutting the ground around the injection pipe using the spray force of the solidified material liquid that is continuously sprayed, and jetting and stirring the solidified material liquid in the cutting region. (For example, refer to Patent Document 1).

  In this type of ground improvement method, for example, a ground improvement device as shown in FIG. 9 can be used (see, for example, Patent Document 2). In this ground improvement device, the inner pipe 42 is a solidified material liquid supply passage 44, and the double pipe injection pipe 41 is an air supply passage 45 between the inner pipe 42 and the outer pipe 43. Have. The injection pipe 41 has a monitor mechanism 49 provided with a solidifying material liquid injection nozzle 51 and an air injection nozzle 52 for injecting air from the periphery of the solidifying material liquid injection nozzle 51 in the lower part. A swivel 46 provided with a solidifying material liquid supply port 47 and an air supply port 48 is connected to the upper portion of the injection pipe 41. The solidified material liquid supplied from the solidified material liquid supply port 47 of the swivel 46 is sprayed from the solidified material liquid injection nozzle 51 of the monitor mechanism 49 through the solidified material liquid supply passage 44 and at the same time, the air supply port of the swivel 46. Air supplied at a high pressure from 48 is jetted from the air jet nozzle 52 around the solidified material liquid jet nozzle 51 through the air supply passage 45.

  In this case, the insertion of the injection pipe 41 having the swivel 46 at the upper part and the monitor mechanism 49 at the lower part into the ground is performed by supplying the solidification liquid from the solidification liquid supply port 47 of the swivel 46 at a high pressure. There are a case of inserting into the drilling hole of the ground while discharging downward from the opening 57 at the tip of the monitor mechanism 49 through the supply passage 44, and a case of inserting into a drilling hole drilled in advance by a boring machine or the like.

  In addition, the conventional ground improvement device has a monitoring mechanism that has one single-port solidified liquid jet nozzle and two single-ported solid set liquid jet nozzles arranged at 180 ° symmetrical positions. And a single-portion solidified liquid jet nozzle and a single water jet nozzle on the opposite side of 180 degrees above the solidified liquid jet nozzle.

Japanese Patent Laid-Open No. 06-306846 JP 2011-144539 A

  By the way, the monitoring mechanism of the ground improvement device has a cutting stirring ability that is insufficient when the injection pressure from each injection nozzle 51 is insufficient with respect to the supply pressure of the solidified material liquid. It is impossible to expand the ground at the same depth, and it is necessary to gradually increase the diameter by several rotations. Accordingly, the rotation speed and the pulling speed of the injection pipe must be slowed down, and a long time is required for cutting. Therefore, the construction period is long and the construction cost is high. Therefore, in order to improve cutting stirring efficiency, it is necessary to increase the injection pressure of the solidified material liquid. For this reason, large-scale plant equipment using high energy, for example, a large pump, a large capacity compressor, a large size A casing machine, a boring machine, and the like are required, resulting in an increase in construction cost.

  Further, as described above, the ground improvement body is obtained by cutting the ground around the injection pipe 41 using the spraying force of the solidified material liquid that is continuously sprayed and by jetting and stirring the solidified material liquid in the cutting region. In this case, mud and solidified liquid after injection are present in the gap between the drilling wall surface and the injection pipe formed in the ground by excavation, and this is the injection energy of the solidified liquid injected from the injection nozzle. It will weaken and the cutting efficiency of the ground will deteriorate.

  The present invention proposes to solve such a conventional problem. The purpose of the present invention is to provide a drilling wall surface, a monitor head, and the like during the drilling operation in spite of adopting a simple and lightweight structure. The solidified material liquid is ejected from a position close to the hole wall surface while suppressing the momentum of the solidified material liquid ejected from the ejection nozzle from being obstructed by the muddy water or the solidified material liquid intervening (residual) with the gap. Thus, an object of the present invention is to provide a ground improvement device capable of quickly and efficiently obtaining a hole having a predetermined diameter.

In order to achieve the above object, a ground improvement device according to claim 1 of the present invention excavates the ground by injecting a solidifying material liquid from a swivel through an injection pipe from an injection nozzle of a monitor mechanism, and the excavated ground is ground. A ground improvement device for ground improvement by injecting a solidified material liquid into a hole region, wherein the monitor mechanism has a solidified material liquid passage in the center thereof communicating with a lower portion of the injection pipe, and the monitor head A piston tube that is inserted into the solidified material liquid passage and is operated by a solidified material liquid that is pumped from the swivel through the solidified liquid passage, a flexible pressure-resistant hose having an upper end connected to a lower portion of the piston tube, The injection pipe connected to the lower end of the pressure hose, the main injection nozzle provided at the tip of the injection pipe, and a plurality of hinge blocks are arranged in parallel. The hinge block is pivotally attached to one block by a pin at one end, and one end of the hinge block located at the uppermost position is pivotally attached to the lower end of the monitor head via a support member The connecting body and the pressure hose pass through the hinge block connecting body from the top to the bottom, and the lower end is fixed to the hinge block at the lowest position of the hinge block connecting body, and is wound around the outer periphery of the pressure hose passing therethrough. A coil spring interposed between the piston pipe and the lowest hinge block of the hinge block coupling body, and expands and contracts in response to the advance and retreat of the piston pipe, and returns the piston pipe, the pressure hose, and the hinge block coupling body. The piston tube is operated in the advance direction by the solidified material liquid pumped through the solidified material liquid passage, and the pressure hose is advanced. The hinge block connecting body is expanded into a fan shape, the pressure hose is bent, the direction of the injection pipe is made substantially horizontal, and the main injection nozzle at the tip of the injection pipe faces the hole wall surface. To do.

  With this configuration, when the solidified material liquid pumped by the pump is ejected from the main injection nozzle through the swivel and the monitor head, the piston pipe installed in the solidified material liquid passage of the monitor head is caused by the pressure of the solidified material liquid. And actuate (lower) against the repulsive force of the coil spring. By operating (lowering) the piston tube, the pressure hose passes through the hinge block connector, and the lower end of the pressure hose is coupled to the lowest hinge block of the hinge block connector. Is forcibly rotated around the pin, and the hinge block connected body connected through the pin also rotates about the respective pin, and the hinge block connected body expands into a fan shape. . The pressure hose is bent by the expansion of the hinge block coupling body, and the rectifier pipe attached to the end of the pressure hose is oriented in a substantially horizontal direction in the maximum bent state. Accordingly, the main injection nozzle provided at the tip of the rectifying pipe faces the wall surface of the drilling hole, and the excavation efficiency of the wall surface is affected by the high pressure of the solidified material liquid injected from the main injection nozzle. Enhanced. In addition, such high-efficiency excavation can be performed with a simple configuration and a small facility. As a result, the injection pressure is high as in the prior art, and there is no need to prepare a large and expensive facility such as a large pump or a large capacity compressor, and a sufficient durability and energy saving effect can be obtained.

Further, in the ground improvement device according to claim 2 of the present invention, the monitor head is provided with an upper injection nozzle that communicates with the solidified material liquid passage and injects the solidified material liquid to the outside of the monitor head. It is characterized by.
With this configuration, not only the main injection nozzle but also the solid injection material liquid is injected from the upper injection nozzle to drill holes, and the ground can be improved.

Further, the ground improvement device according to claim 3 of the present invention excavates the ground by injecting the solidified material liquid from the swivel through the injection pipe and from the injection nozzle of the monitor mechanism, and the solidified material is formed in the drilling region of the excavated ground. A ground improvement device for ground improvement by injecting liquid, wherein the monitor mechanism is fixed to a monitor head having a hollow piston rod in the center communicating with a lower portion of the injection pipe, and the hollow piston rod. The solidified material liquid pumped from the swivel through the injection tube into the hollow piston rod is pumped into the monitor head from the through hole provided in the piston rod, and the piston advances and retreats by the pumped solidified material liquid; A coil spring provided in the monitor head that expands and contracts as the piston moves forward and backward, and a support attached to the lower end of the monitor head , A base portion pivotally supported by the support ring, an injection pipe communicating with the monitor head, a main injection nozzle provided at the tip of the injection pipe, and a lower side of the lower end of the support ring A fixing ring attached to a lower end of the hollow piston rod protruding to the opening, and an opening / closing operation member pivotally supported at both ends by the fixing ring and the injection pipe, and the passage of the hollow piston rod from the swivel. A plurality of the jets communicated with the monitor head via the opening / closing operation member linked with the hollow piston rod by advancing and retracting the hollow piston rod together with the piston by the solidified material liquid fed into the monitor head through the hole. The direction of the pipe is expanded in a substantially horizontal direction so that the main injection nozzle at the tip of the injection pipe faces the hole wall surface.

  With this configuration, the solidified material liquid sent from the swivel through the injection tube to the hollow piston rod can be press-fitted between the hollow piston rod and the monitor head through the through hole, and the piston is moved against the repulsive force of the coil spring. It can be moved within the monitor head. As the piston moves, the hollow piston rod to which the piston is attached also moves at the same time, and the injection pipe linked to the fixing ring at the lower end of the hollow piston rod via an opening / closing operation member and the protection The covers can be rotated in a direction to open each other around a pin on the support ring. The main injection nozzle at the tip of the injection pipe can be brought close to the hole wall surface by the rotation of the injection pipe and the protective cover. As a result, even if the solidified material liquid or muddy water after injection stays between the drilling hole and the monitor head, it can be avoided that the power of the solidified material liquid injected from the main injection nozzle is greatly impaired. Drilling efficiency can be increased.

The present invention has the following effects.
(1) When injecting the solidifying material liquid, the main injection nozzle approaches the hole wall surface, so that during the drilling operation, the intervening liquid such as muddy water and solidifying material liquid remaining in the gap between the monitor head and the hole wall It is possible to suppress the impeding momentum of the solidified material liquid injected from the main injection nozzle toward the hole wall surface, and it is possible to quickly and efficiently form a hole having a predetermined diameter.
(2) Since the intervening liquid remaining between the monitor head or the like and the hole wall is a mixture of muddy water, cement, and earth and sand, the injection speed of the injection solidifying material liquid is attenuated and the injection pressure is reduced. Therefore, in the past, high pressure was required, and a large pump, a large capacity compressor, a large casing machine, a dedicated boring machine, etc. were required, and the facilities became huge and the cost was high. The main injection nozzle is exposed close to the hole wall surface, so there is no attenuation of speed and pressure, avoiding the use of conventional large pumps, large capacity compressors, large casing machines, dedicated boring machines, etc. Can improve economy.
(3) When the injection of the solidifying material liquid is started from the main injection nozzle, the main injection nozzle automatically comes close to the hole wall and automatically returns when the injection of the solidifying material liquid is stopped. No need to operate, good workability.
(4) In the case where not only the main injection nozzle but also the upper injection nozzle are provided, the solidification material liquid can be injected from not only the main injection nozzle but also the upper injection nozzle to drill holes, so that the ground improvement can be performed. And workability is improved.

  The present invention has been briefly described above. The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings.

It is a front view which cuts and shows the principal part of the ground improvement apparatus by embodiment of this invention. It is a disassembled perspective view which shows the connection structure of the hinge block coupling body of the ground improvement apparatus in FIG. It is a disassembled perspective view which shows the modification of the connection structure of the hinge block coupling body shown in FIG. It is a front view which shows the operation state of the ground improvement apparatus principal part in FIG. It is explanatory drawing (a) (b) which shows notionally the drilling process by the ground improvement apparatus principal part in FIG. It is a front view which shows a ground improvement device according to another embodiment of the present invention with a part cut away. It is explanatory drawing (a) (b) which shows notionally the drilling process by the ground improvement apparatus shown in FIG. It is a front view (a) (b) which shows a ground improvement device by further another embodiment of the present invention partially fractured. It is a vertical front view (a) (b) which shows the conventional ground improvement apparatus.

  Hereinafter, a ground improvement device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8.

  FIG. 1 shows a ground improvement device according to this embodiment. This ground improvement device excavates the ground while injecting the solidified material liquid from the main injection nozzle of the monitor mechanism through the injection pipe from the swivel, and injects the solidified material liquid into the excavated area to improve the ground. The monitor mechanism A includes a monitor head 1, a piston pipe 3 as a piston member, a pressure hose 4, an injection pipe 5 as a rectifying pipe, a main injection nozzle 6, a hinge block connector 7, a coil. And a spring 9.

  Among these, the monitor head 1 has a cylindrical shape, and integrally has a swivel as described above at the top, and a solidified portion communicating with a solidifying material liquid injection pipe (injection passage) provided in the swivel at the center. A material liquid passage 10 is formed. In the solidified material liquid passage 10, the piston pipe 3 having a spring receiver 11 at the lower end is installed so as to be operable (lifted / lowered). This spring receiver 11 also serves as a connecting member for connecting one end of a pressure hose 4 described later to the piston pipe 3.

  The piston tube 3 has a hollow portion serving as a solidified material liquid passage, and is advanced and retreated (moved downward in the figure) by the solidified material liquid fed from the swivel through the solidified material liquid passage 10. Function. The outer diameter of the spring receiver 11 is larger than the outer shape of the solidified material liquid passage 10. Therefore, the amount of the piston pipe 3 rising in the solidified material liquid passage 10 is regulated by the spring receiver 11.

  The pressure hose 4 is made of a flexible material such as rubber or synthetic resin having flexibility and toughness, and the upper end of the pressure hose 4 is connected to the lower end of the spring receiver 11 at the lower end of the piston tube 3. . The high-toughness injection pipe 5 made of a steel pipe, an aluminum pipe or the like is connected to the lower end of the pressure hose 4 via a connection block 12. A main injection nozzle 6 is attached to the tip of the injection pipe 5.

  A plate-like support member 13 is fixed to the lower end of the monitor head 1, and the spring receiver 11 can be advanced and retracted through a through hole of the support member 13. The hinge block connector 7 is attached to the support member 13. The hinge block connecting body 7 includes a plurality of plate-like hinge blocks 8 (9 in this example) arranged in parallel, and is rotated by a pin 14 between adjacent hinge blocks 8 and 8 of the parallel hinge blocks 8 on one end side. The hinge block 8 is pivotally attached freely, and one end side of the uppermost hinge block 8 is rotatably attached to the support member 13 by a pin 14.

Further, referring to FIG. 2, the hinge block 8 is provided with mounting pieces 8b and 8b facing both side ends of the plate-like main body 8a, and a pin 14 is inserted into the facing mounting pieces 8b and 8b. Pin insertion holes 18 and 18 are provided facing each other, and the main body 8a has a width that can be fitted between the opposing mounting pieces 8b and 8b, and a pin insertion hole 16 for inserting the pin 14 is provided at one end of the main body 8a. Is provided. The adjacent hinge blocks 8 and 8 have the main body 8a of one hinge block 8 fitted between the mounting pieces 8b and 8b of the other hinge block 8, and the positions of the pin insertion holes 16, 18, and 18 are adjusted. By inserting the pin 14 into the pin insertion holes 16, 18, 18, they are pivotally attached to each other. All the hinge blocks 8 are sequentially connected to each other by the same pin coupling structure. The hinge block 8 is a corner cut portion 17 in which a corner portion of the main body 8a on the side of the part pivoted by the pin 14 is cut away so that the hinge blocks 8 and 8 can be rotated with each other. It has become.
Thereby, when each hinge block 8, 8 is rotated around the pin 14, each hinge block 8, within the range where each corner cut portion 17 hits the upper surface of the main body 8a of another adjacent hinge block 8 8 can be rotated around each pin 14, and the hinge block connector 7 can be expanded into a fan shape as a whole. In addition, the rotation range of each hinge block 8 can be regulated by the shape (cutting condition) of the corner cut portion 17, and the range of fan-shaped expansion can be regulated.

  FIG. 3 shows a modification of the connection structure shown in FIG. In FIG. 2, the main body 8a of the hinge block 8 has the same thickness over the entire length, and the mounting piece 8b also extends over the entire length of the main body 8a. In this example, however, the mounting portion 8c protrudes downward from a part of the main body 8a. The mounting portion 8c is provided with a pin insertion hole 16, and the mounting piece 8b is not a full length of the main body 8a but a short piece, and a pin insertion hole 18 is formed in the short mounting piece 8b. The other components are the same as those of the mounting structure shown in FIG. 2, and the same components are denoted by the same reference numerals, and other detailed descriptions are omitted.

  The structure in which the uppermost hinge block 8 of the hinge block coupling body 7 is rotatably attached to the support member 13 is also the same. That is, the support member 13 is equivalent to the main body 8a of the hinge block 8, a pin insertion hole is formed on one end side of the support member 13, and the support member 13 is fitted between the mounting pieces 8b, 8b of the hinge block 8, The pin 14 is inserted into the pin insertion hole 18 of the mounting pieces 8b, 8b and the pin insertion hole of the support member 13, and pivotally attached.

  The pressure hose 4 passes through the hinge block connector 7 from the upper part to the lower part, and the lower end is fixed to the lowest hinge block 8 of the hinge block connector 7 by a fixing bracket 15. A coil spring 9 is interposed between the fixing fitting 15 and the spring receiver 11 at the lower end of the piston pipe 3 so as to be wound around the outer periphery of the pressure-resistant hose 4. The coil spring 9 acts to return the piston pipe 3, the pressure hose 4 and the hinge block connector 7 to their original positions.

  According to the monitor mechanism A configured as described above, the hinge block coupling body 7 is expanded in a fan shape against the repulsive force of the coil spring 9 and the pressure-resistant hose 4 is bent as shown in FIG. The direction of the main injection nozzle 6 connected to the pressure hose 4 via the rectifying pipe 5 can be set to a substantially horizontal direction.

  Next, the operation of the ground improvement device having such a configuration will be described. This ground improvement device is attached to a drill head or the like that moves forward and backward (lifts and lowers) along the leader of the excavator, and is rotated and advanced and retracted (lifted and lowered) by driving and advancing and retracting the drill head. Therefore, this ground improvement device is inserted to a predetermined depth of the ground. In this insertion, as shown in FIG. 5 (a), the solidified material liquid or water is injected from the swivel through the solidified material liquid passage 10 through the injection tube toward the ground from the main injection nozzle 6 at the tip of the injection tube 5. However, there are cases where the ground is drilled in advance using a boring machine and the ground is inserted into the hole. The supply pressure of the solidified material liquid or water at the time of drilling is set such that the piston tube 3 does not operate and the pressure hose 4 does not bend.

When the insertion of the monitoring mechanism A into the ground reaches a predetermined depth, the supply of the solidifying material liquid to the solidifying material liquid passage 10 is started. Then, in response to the supply pressure of the solidifying material liquid, the piston tube 3 descends in the solidifying material liquid passage 10 against the repulsive force of the coil spring 9. At the same time, the pressure hose 4 is also lowered.
For this reason, the lowermost hinge block 8 holding the lower end of the pressure-resistant hose 4 by the fixing bracket 15 rotates around the pin 14, and then the other hinge blocks 8 also sequentially rotate. As shown in FIG. 4 and FIG. 5 (b), almost the whole 7 expands into a fan shape. As the hinge block connector 7 is expanded, the pressure-resistant hose 4 penetrating the hinge block connector 7 is curved in an arc as shown in FIG. For this reason, the direction of the rectifying pipe 5 attached to the lower end of the pressure-resistant hose 4 also changes direction and fluctuates up to a substantially horizontal direction, and the position of the main injection nozzle 6 at the tip of the rectifying pipe 5 also fluctuates accordingly. That is, as shown in FIG. 5B, the main injection nozzle 6 faces the hole wall surface. The degree of curvature of the pressure hose 4 can be arbitrarily set by adjusting the supply pressure of the solidifying material liquid.

Therefore, as shown in FIG. 5B, the solidified material liquid pumped from the solidified material liquid passage 10 of the monitor head 1 is sprayed from the main injection nozzle 6 at the tip of the rectifying pipe 5 to the hole wall surface. Do excavation. Then, while continuing this excavation, the monitor head 1 is rotated and slowly lifted toward the ground. As a result, the main injection nozzle 6 faces a position close to the wall surface of the hole, so that even if there is a solidified material liquid or muddy water that has already been injected between the hole and the monitor head 1, the main injection nozzle 6 is driven by this solidified material liquid or muddy water. The ejecting force of the solidifying material liquid ejected from is not greatly impaired. Therefore, the solidification material liquid from the main injection nozzle 6 can be effectively collided with the hole wall surface near the main injection nozzle 6 to improve the efficiency of excavation work.
As a result, the ground improvement of the excavation area by the solidifying material liquid injected into the ground can be effectively carried out. By performing the ground improvement while pulling up the monitor head 1 toward the ground, a ground improvement portion can be created in a predetermined section of the ground.

FIG. 6 is a front view showing a ground improvement device according to another embodiment of the present invention with a part cut away.
In this embodiment, the monitor head 1 is provided with an upper injection nozzle 2 that communicates with the solidified material liquid passage 10 and injects the solidified material liquid to the outside of the monitor head 1. Since it is the same, the same code | symbol is attached | subjected to the same component and other detailed description is abbreviate | omitted. The upper injection nozzle 2 is preferably provided so as to be in a direction opposite to the injection direction of the main injection nozzle 6 because it opposes the injection reaction force of the main injection nozzle 6.

According to the ground improvement device shown in FIG. 6, as shown in FIGS. 7 (a) and 7 (b), not only the main injection nozzle 6 but also the upper injection nozzle 2 injects the solidified material liquid to perform the ground improvement construction. It becomes possible.
That is, the insertion of this apparatus into the ground is performed by supplying the solidified material liquid or water from the swivel through the solidified material passage 10 through the solidified material passage 10 and the upper injection nozzle 2 and the main injection nozzle 6 as shown in FIG. Inject toward the hole to drill and insert. At this time, as shown in FIG. 7 (a), since the upper injection nozzle 2 is injected in a substantially horizontal direction on the side, it acts mainly to expand the diameter of the drill hole, and from the main injection nozzle 6, Since it is injected downward, it works mainly to drill holes in the depth direction. In this case, the supply pressure of the solidifying material liquid or water is set such that the piston tube 3 does not operate and the pressure hose 4 does not bend.
Of course, this device may be inserted by drilling in advance using a boring machine.

When the monitoring mechanism A of the ground improvement device is inserted into the ground to a predetermined depth, the solidified material liquid is supplied through the solidified material liquid passage 10 and the piston tube 3 resists the repulsive force of the coil spring 9. And supply it so that it operates (lowers). Then, in response to the supply pressure of the solidifying material liquid, the piston tube 3 descends in the solidifying material liquid passage 10 against the repulsive force of the coil spring 9. At the same time, the pressure hose 4 is also lowered.
For this reason, the lowermost hinge block 8 holding the lower end of the pressure-resistant hose 4 by the fixing bracket 15 rotates around the pin 14, and then the other hinge blocks 8 also sequentially rotate. As in FIG. 4, almost the whole 7 expands into a fan shape. As the hinge block connecting body 7 is expanded, the pressure-resistant hose 4 penetrating the hinge block connecting body 7 is curved in an arc shape as shown in FIG. For this reason, the rectifying pipe 5 attached to the lower end of the pressure hose 4 also changes its direction in the substantially horizontal direction, and the position of the main injection nozzle 6 at the tip of the rectifying pipe 5 changes accordingly, as shown in FIG. It will approach the hole wall surface.

Therefore, as shown in FIG. 7B, the monitor head 1 is rotated while spraying the solidified material liquid from the upper spray nozzle 2 and the main spray nozzle 6 onto the hole wall surface, and slowly lifted toward the ground. For this reason, first, the upper injection nozzle 2 drills holes, and then the main injection nozzle 6 sprays holes toward the hole wall surface, so that the hole diameter can be increased and the hole drilling ability can be increased. It is possible to improve and shorten the construction time. Moreover, even if there is a solidified material liquid injected from the upper injection nozzle 2 or a solidified material liquid injected from the main injection nozzle 6 between the monitor head 1 (main injection nozzle 6) and the hole wall surface, the main injection is performed. Since the nozzle 6 faces close to the hole wall surface, the nozzle 6 can drill the hole without significantly impairing the ejection force injected from the main injection nozzle 6.
As a result, the ground improvement of the excavation area by the solidifying material liquid injected into the ground can be carried out more effectively. This ground improvement is performed while pulling up the monitor mechanism A (monitor head 1) toward the ground, whereby a ground improvement portion can be created in a predetermined section of the ground.

  FIG. 8 shows a ground improvement device according to still another embodiment of the present invention, FIG. 8 (a) is a partially cutaway front view showing the ground improvement device before operation, and FIG. 8 (b) is an operating state. It is a front view which partially fractures and shows the ground improvement apparatus. This ground improvement device excavates the ground by injecting the solidified material liquid from the main injection nozzle of the monitoring mechanism through the injection pipe from the swivel, and injects the solidified material liquid into the drilling area of this excavated ground to improve the ground. To do. The monitor mechanism includes a monitor head having a hollow piston rod communicating with the lower part of the injection tube at the center, and a hollow piston rod fixed from the swivel to the hollow piston rod of the monitor head via the injection tube. The solidified material liquid pumped into the rod is pumped into the monitor head from the through hole provided in the piston rod, and the piston serving as a piston member that is operated by the pressured solidified material liquid and the jet communicating with the monitor head A solidified material liquid having a main injection nozzle provided at the tip of the pipe and a coil spring provided in the monitor head and extending and retracting as the piston advances and retreats, and is pumped through the hollow piston rod By actuating the piston member, the main injection nozzle together with the injection pipe is brought close to the hole wall surface. It is a configuration called to face. As a result, the ground is excavated while injecting the solidified material liquid from the main injection nozzle of the monitor head constituting the monitor mechanism B through the above-described swivel injection pipe (not shown), and the solidified material liquid is poured into the excavated hole area. Spray to improve the ground.

  The monitor mechanism B includes a monitor head 21, a hollow piston rod 22, a piston 23 that is a piston member, a coil spring 24, a support ring 25, an injection pipe 26, a fixing ring 27, an opening / closing operation member 28, It is configured with. Among these, the monitor head 21 has a cylindrical shape, and integrally has a swivel (not shown) as described above at an upper portion thereof, and a solid material injection pipe (injection passage) as described above at the center of the swivel. ) Is provided with a tubular hollow piston rod 22. The hollow piston rod 22 is connected to the injection tube so as to be slidable in the axial direction, and is movable in the axial direction within the monitor head 21.

  The hollow piston rod 22 is inserted into the center of the monitor head 21, the lower half is slidably passed through the bottom (closed end) of the monitor head 21, and the lower end is closed. Yes. A through hole 29 is formed in a portion of the hollow piston rod 22 that always faces the monitor head 21. The through hole 29 functions to send the solidified material liquid fed through the injection pipe of the swivel between the hollow piston rod 22 and the monitor head 21. On the outer periphery of the hollow piston rod 22 above the position of the through hole 29, a ring-shaped piston 23 is mounted on the inner peripheral surface of the monitor head 21 so as to be slidable in the axial direction. A coil spring 24 is provided between the piston 23 and a part (upper part) of the monitor head 21 to constantly urge the piston 23 downward.

  The monitor head 21 has a support ring 25 on the outer periphery of the lower end, and a base portion of a protective cover 32 covering the injection pipe (rectifying pipe) 26 is disposed at a pair of opposed positions on the outer periphery of the support ring 25. It is pivotally supported by a pin 30 together with the base. A main injection nozzle 31 is provided at the tip of these injection pipes 26. The injection pipe 26 can be supplied with a solidified material liquid through a hollow piston rod 22 or another solidified material liquid injection pipe (not shown). Near the center of the fixing ring 27 and the protective cover 32 attached to the lower end of the hollow piston rod 22, both ends of an opening / closing operation member (link member) 28 are connected to each other by a single pin 33, 34. ing.

  In the ground improvement device having such a configuration, in the step of inserting the ground improvement device into a drilling hole excavated in the ground in advance (excavation preparation step), the solidification of the hollow piston rod 22 of the monitor mechanism B from the injection pipe of the swivel. Supply of material liquid is stopped. At this time, the monitor mechanism B takes a form as shown in FIG. That is, when the supply of the solidifying material liquid is stopped, there is no pumping of the solidifying material liquid from the injection pipe into the monitor head 21 through the hollow piston rod 22 and the through hole 29, so that the piston member (piston) 23 receives the repulsive force of the coil spring 24, and maintains the downward state (downward position) of illustration. For this reason, the hollow piston rod 22 also maintains the same lowered position, and the opening / closing operation members 28 pivotally supported by the hollow piston rod 22 are in a closed state. Accordingly, the ejection pipe 26 is also kept closed together with the cover 32 on the monitor head 21 side.

  On the other hand, in the step of improving the ground by inserting this ground improvement device into a drilling hole excavated in the ground in advance, the solidified material liquid is supplied into the hollow piston rod 22 through the injection pipe of the swivel. Then, when the injection pressure of the solidifying material liquid reaches a predetermined pressure, it is press-fitted into the monitor head 21 below the piston member 23 (between the monitor head 21 and the hollow piston rod 22) through the through hole 29. Therefore, upon receiving the supply pressure of the solidifying material liquid, the piston member 23 rises in the monitor head 21 in the axial direction in the figure against the repulsive force of the coil spring 24 together with the hollow piston rod 22 to which the piston member 23 is attached. To do. At this time, the coil spring 24 is compressed so as to increase the repulsive force.

  As the piston member 23 is raised in the monitor head 21, the fixing ring 27 is also raised via the piston rod 22. For this reason, each of the protective covers 32 supported via the fixing ring 27, the opening / closing operation member 28 and the pin 33 is rotated in the direction of expanding to each other, and is expanded as shown in FIG. 8B. As a result, the injection pipe 26 also rotates in the same direction to reach a substantially horizontal position, and the main injection nozzle 31 provided at the tip of the injection pipe 26 comes close to the hole wall surface of the ground. Thereby, it can suppress that the solidification material liquid which stayed in the drilling hole obstruct | occludes the injection pressure of the solidification material liquid ejected from the main injection nozzle 31, and can improve the excavation efficiency of a drilling hole wall surface. As a result, the ground improvement of the excavation area by the solidified material liquid injected into the ground can be effectively carried out. This ground improvement is performed while rotating and pulling up the monitor head 21 toward the ground, whereby a ground improvement portion can be created in a predetermined section of the ground. The pressure in the monitor head 21 is reduced by stopping the supply of the solidified material liquid from the swivel injection pipe into the hollow piston rod 22 and reducing the supply pressure of the solidified liquid to the injection pipe. Can be made. In this case, in response to the repulsive force of the compressed coil spring 24, the piston 23 descends in the monitor head 21 and returns to the state shown in FIG. Thereby, each injection pipe 26 is closed while rotating around the pin 30 together with the protective cover 32, and it is possible to facilitate transportation, storage and the like of the ground improvement device.

  As described in detail above, the ground improvement device of the present invention is such that the monitor mechanism A, B has the monitor head 1 having the solidified material liquid passage 10 or the hollow piston rod 22 communicating with the lower part of the injection pipe in the center. 21 and piston members 3, 23 provided in the solidified material liquid passage 10 or the hollow piston rod 22 and operated by the solidified material liquid pumped from the swivel through the solidified material liquid passage 10 or the hollow piston rod 22, , Communicating with the solidified material liquid passage 10 or the hollow piston rod 22, the injection pipes 5, 26 provided with the main injection nozzles 6, 31 at the tip, and the monitor heads 1, 21 provided with the piston member 3, Coil springs 9 and 24 that expand and contract in accordance with the advance and retreat of 23, and pressure is applied through the solidified material liquid passage 10 or the hollow piston rod 22. By operating the piston members 3 and 23 in one direction by the solidified material liquid, the main injection nozzles 6 and 31 at the tips of the injection tubes 5 and 26 linked to the piston members 3 and 23 are brought close to the hole wall surface. It is configured so that it can be seen.

  Thus, the piston members 3 and 23 are operated by the sending pressure of the solidifying material liquid sent from the swivel to the solidifying material liquid passage 10 or the hollow piston rod 22 through the injection pipe, thereby being linked to the piston members 3 and 23. The injection pipes 5 and 26 can be faced with the main injection nozzles 6 and 31 approaching the hole wall surface. As a result, even if the solidified material liquid sprayed between the hole wall surface and the monitor heads 1 and 21 stays, the power of the solidified material liquid sprayed from the main spray nozzles 6 and 31 is greatly impaired. This can be avoided and the hole drilling efficiency of the ground can be increased.

  In the ground improvement device of the present invention, the momentum of the solidified material liquid injected from the main injection nozzle is hindered by the muddy water and the solidified material liquid remaining in the gap between the drilling hole and the injection pipe or the monitor head during the drilling operation. By spraying the solidifying material liquid from a position close to the hole wall surface while suppressing as much as possible, it has the effect that a hole with a predetermined diameter can be obtained quickly and efficiently, and solidifies in the cutting area in the ground. It is useful for a ground improvement device that builds a ground improvement body by jetting and stirring the material liquid.

1, 21 Monitor head 2 Upper injection nozzle 3 Piston pipe (piston member)
4 Pressure hose 5, 26 Injection pipe (rectifier pipe)
6, 31 Main injection nozzle 7 Hinge block connecting body 8 Hinge block 8a Main body 8b Mounting piece 8c Mounting portion 9, 24 Coil spring 10 Solidified material liquid passage 11 Spring receiver 12 Connecting block 13 Bearing member 14 Pin 15 Fixing bracket 16 Pin insertion hole 17 Corner cut portion 18 Pin insertion hole 22 Hollow piston rod 23 Piston (piston member)
25 Support ring 27 Fixing ring 28 Opening / closing operation member 29 Through hole A, B Monitor mechanism

Claims (3)

A ground improvement device that excavates the ground by injecting the solidified material liquid from the swivel through the injection pipe and from the injection nozzle of the monitoring mechanism, and injects the solidified material liquid into the drilled area of the excavated ground to improve the ground. ,
The monitoring mechanism is
A monitor head having in the center a solidified material liquid passage communicating with the lower portion of the injection tube;
A piston pipe that is inserted into the solidified liquid passage of the monitor head and is operated by a solidified liquid that is pumped from the swivel through the solidified liquid path;
A flexible pressure-resistant hose whose upper end is connected to the lower part of the piston tube;
An injection pipe connected to the lower end of the pressure hose;
A main injection nozzle provided at the tip of the injection pipe;
A plurality of hinge blocks are juxtaposed, and adjacent hinge blocks of the juxtaposed hinge blocks are pivotally attached to one end by a pin so that one end of the hinge block located at the uppermost position is connected to the monitor head. A hinge block connecting body rotatably attached to the lower end via a support member;
The pressure hose penetrates the hinge block connecting body from the upper part to the lower part, the lower end is fixed to the hinge block at the lowest position of the hinge block connecting body, and is wound around the outer periphery of the penetrating pressure hose. A coil spring interposed between the lowermost hinge block of the pipe and the hinge block coupling body, expanding and contracting as the piston pipe advances and retreats, and returning the piston pipe, the pressure hose and the hinge block coupling body ,
The injection pipe with a hinge block connected body by expanding in a fan shape curving the pressure hose by advancing the pressure hose is operated in the advancing direction of the piston tube by solidifying material liquid to be pumped through the solidifying agent fluid passage a substantially horizontal orientation, characterized in that to face in proximity the main injection nozzles of injection Ikan tip drilling wall, soil improvement device. The ground improvement device according to claim 1, wherein the monitor head is provided with an upper injection nozzle that communicates with the solidified material liquid passage and injects the solidified material liquid to the outside of the monitor head. A ground improvement device that excavates the ground by injecting the solidified material liquid from the swivel through the injection pipe and from the injection nozzle of the monitoring mechanism, and injects the solidified material liquid into the drilled area of the excavated ground to improve the ground. ,
The monitoring mechanism is
A monitor head having a hollow piston rod communicating with the lower part of the injection tube in the center;
The solidified liquid fixed to the hollow piston rod and pumped from the swivel through the injection pipe into the hollow piston rod is pumped into the monitor head from the through hole provided in the piston rod, and the pumped solidification is performed. A piston that moves forward and backward with the material liquid,
A coil spring provided in the monitor head, which expands and contracts in accordance with the advancement and retraction of the piston;
A support ring attached to the lower end of the monitor head;
An injection pipe that is pivotally supported by the support ring and communicates with the monitor head;
A main injection nozzle provided at the tip of the injection pipe;
A fixing ring attached to the lower end of the hollow piston rod protruding downward from the lower end of the support ring;
An opening / closing operation member whose both ends are pivotally supported by the fixing ring and the injection pipe,
The hollow piston rod is advanced and retracted together with the piston by the solidified material liquid fed into the monitor head through the through hole of the hollow piston rod from the swivel, and the monitor is operated via the opening / closing operation member linked to the hollow piston rod. and substantially it is expanded in the horizontal direction the orientation of the plurality of injection pipes communicating with the head, characterized in that to face to the main injection nozzle of the injection tube tip close to the boring walls, ground Release modifying apparatus.

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