JPH11100837A - Ground improving body construction method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground improving body construction method and a device used therefor that can efficiently discharge sludge without depending on a construction direction and appropriately treat and recycle sludge discharged onto the ground surface. SOLUTION: In this ground improving body construction method, a ground improving body 64 is constructed by injecting flash-setting solidifying material while moving and rotating an injection rod 14 toward a drilled hole 62. In this case, a hardening material pipe, a flash setting agent pipe, a high pressure water pipe and a discharge pipe for discharging sludge are provided in the injection rod 14. Sludge is sucked by a pumping device 16, and part of high pressure water in the injection rod 14 is fed into the discharge pipe and injected in the discharge direction of sludge to accelerate discharge. On the ground surface, soil grain eliminating treatment of sludge is applied, and treated water is recycled as high pressure water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to improvement of soft ground,
Regarding the ground improvement body construction that is constructed for the purpose of building the foundation of the building, supporting the ground, etc.In particular, the ground improvement body construction method that can perform omnidirectional construction regardless of the vertical, horizontal, etc. And its device.

[0002]

2. Description of the Related Art A method for forming a ground improvement body by injecting a solidifying material is basically based on a so-called vertical construction method, and has been general and simple. For example, in the method using high-pressure injection, after drilling holes in the ground, an injection rod is inserted, and the solidified material is injected into the surrounding ground by high-pressure jet injection while rotating and moving the rod up and down. Build your body. The impact of the high-pressure jet crushes the surrounding ground and promotes agitation between the surrounding ground and the solidified material. It is also common to inject high-pressure air or water at the same time for more effective operation. In this method, a plurality of pipes for transferring solidified material, air, water, etc. are provided inside the injection rod,
A nozzle is provided on the outer periphery of the rod for ejecting them to the outside. There is also a method in which a solidified material is sprayed in a state of being surrounded by air or water by using concentric multiple nozzles.

[0003]

With the recent increase in large-scale civil engineering work, it has been required to increase the size of the ground improvement body construction work. Therefore, even in the method using high-pressure injection, the injection pressure was increased to an extremely high pressure and the amount of the solidified material, water, and air was increased in order to form a larger consolidated body. In small-scale construction, it is sufficient to allow the so-called slime generated during construction in the ground to rise naturally through the gap between the injection rod and the drilling hole as a discharge path due to the air lift effect and eject it to the ground. I was However, in large-scale construction, a large amount of discharged mud is not discharged efficiently and may accumulate and cause excessive ground pressure, which may cause the surrounding ground to rise and adversely affect nearby buildings. Or the muddy liquid spouted from an unexpected point, which hindered the construction itself. This phenomenon is
This occurred not only in large-scale construction, but also in construction in directions other than vertical, such as horizontal construction, and was also a cause of difficulty in omnidirectional construction.

On the other hand, a large amount of mud discharged by ground improvement works includes a large amount of mud and also contains a solidifying material such as a hardening material. Absent. Therefore, there is a demand for a safe and low-cost method for treating sludge. In view of the above problems, it is an object of the present invention to provide a ground improvement body construction method and an apparatus used therefor that enable efficient discharge of mud fluid regardless of the construction direction in the construction of a ground improvement body. . In particular, the present invention provides a method and an apparatus for appropriately treating and recycling sludge discharged to the surface in consideration of environmental protection.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for making a hole in a target ground, inserting an injection rod into the hole, and moving and rotating the injection rod in the direction of the hole. In the ground improvement body forming method of forming a ground improvement body on the target ground by injecting the solidification material while causing the solidification material to be injected, a quick setting method using a hardening material and a quick setting agent as the solidification material. In addition, a hardening material tube for feeding the hardening material into the injection rod,
A flash agent pipe for pumping the flash binder, a high-pressure water pipe for pumping high-pressure water, and a slime discharge pipe for sucking and discharging the waste liquid are provided. Then, while the high-pressure water is jetted to the target ground to cut the ground, the hardening material and the instant binder are concentrically jetted to form the ground improvement body. Furthermore, the pump device sucks the muddy liquid through the slime discharge pipe,
A part of the high-pressure water in the injection rod is supplied to a slime discharge pipe, and a part of the high-pressure water is injected in the slime discharge pipe in a discharge direction of the muddy liquid. On the surface of the ground, a soil particle removal process of the muddy liquid sucked by the pump device is performed, and the treated water is reused as the high-pressure water.

[0006] The present invention also provides an apparatus for performing the above ground improvement body forming method. That is, the ground improvement body forming apparatus, the injection rod is a hardening material pipe for pumping the hardening material, a flashing agent pipe for pumping the flashing agent, a high-pressure water pipe for pumping high-pressure water, and sucking the muddy liquid. And a slime discharge pipe for discharging. The monitoring part of the injection rod has a high-pressure water injection nozzle that injects high-pressure water to cut the target ground, a hardening material injection nozzle and a quick-setting agent that are arranged to concentrically jet the hardening material and the quick-setting agent. An injection nozzle is provided. Also, in the injection rod, a pipe that branches off from the high-pressure water pipe and is connected to the slime discharge pipe to supply a part of the high-pressure water to the slime discharge pipe, and a part of the supplied high-pressure water is supplied to the slime discharge pipe. An in-pipe injection mechanism comprising an in-pipe injection nozzle for injecting the sludge in the discharge direction is provided. Further, on the surface of the ground, there are provided a pump device for sucking the muddy liquid through a slime discharge pipe, and a muddy water treatment device for performing a soil particle removal process so as to reuse the sucked muddy water as the high-pressure water.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing the state of implementation of a ground improvement body forming method according to the present invention. In the description of the injection rod of the ground improvement body forming apparatus used in the present construction method, for convenience, the side with the monitor unit is referred to as the distal end side, and the side connected to the driving machine and the swivel is referred to as the proximal end side.

The driving machine 12 installed on the ground functions as a boring machine and is used for forming a hole 62 in the target ground 60. After drilling, the injection rod 1
4 is inserted to start the solidified material injection step. Injection rod 1
4 may also be used for drilling. Injection rod 1
The so-called monitor part 50 at the tip of 4 is exposed inside the hole. In the injection step, the injection rod 14 is appropriately moved up and down while being rotated by the drive machine 12. At this time, the solidified material is ejected from the monitor unit 50. In the present invention, a hardening material 34 and an instant binder 35 are used as a solidifying material. The hardening material is cement milk or the like, and in the present invention, since a quick-setting agent is used, the hardening material 34 and the quick-setting agent 35 are separately transferred to a nozzle provided on the outer periphery of the monitor 50, and are ejected from the nozzle. When mixed. Further, high-pressure water 33 is also jetted from the monitor unit 33, thereby cutting the surrounding ground. Further, in the present invention, a mud outlet is provided at the most proximal side of the monitor section 50, from which mud liquid 32 is sucked into the injection rod 14 and sent to the ground surface.

A swivel 58 is provided at the base end of the injection rod 14.
Are provided, and are connected to respective supply devices for the hardening material, the instantaneous binder, and the high-pressure water, and to the treatment device for the sludge liquid.

The suction of the sludge liquid 32 from the sludge outlet is actively performed by the sludge pump 16. A sludge flow meter 15 is provided between the swivel 58 and the sludge pump 16 and is used for controlling the sludge pump 16. The sludge discharged through the sludge pump 16 is sent to a processing device to remove soil particle components. First, relatively large soil particles are removed from the sludge by the desander 17. The muddy liquid that has passed through the desander 17 is stored as wastewater 30 in the treatment tank 19, and what is removed becomes separated sediment 21. Furthermore, the drainage 30
The water is sent from the processing tank 19 to the cyclone 18 by the pump 20. After the finer particles are removed in the cyclone 18, the water is stored in the water tank 22 as water 31 containing no soil particles having a predetermined size or more. Water tank 22
The water 31 stored in the water is again usable as high-pressure water for cutting. Therefore, this water is pumped up by the pump 23 and sent to the high-pressure water pump 24, and is sent from the high-pressure water pump 24 to the injection rod 14 as high-pressure water.
Thus, the recycling system for the soil particle removal treatment of the wastewater in the present invention is realized.

On the other hand, in the solidified material plant 25, the hardening material and the quick-setting agent are adjusted respectively, and sent to the high-pressure pump 28 for the hardening material and the high-pressure pump 29 for the quick-setting agent via the flow meters 26 and 27, respectively, on individual paths. Can be And each pump 28, 29
From the injection rod 14.

FIG. 2 is a schematic cross-sectional view of the monitor 50, which is the tip of the injection rod 14 shown in FIG. Inside the injection rod, a hardening material tube 53 for pumping the hardening material and a flashing agent tube 54 for feeding the flashing agent are provided in parallel, and connected to the hardening material injection nozzle 44 and the flashing agent injection nozzle 45, respectively. ing. The hardener injection nozzle 44 and the instantaneous binder injection nozzle 45 are provided concentrically so that the latter surrounds the former. Therefore, the hardening material is concentrically surrounded and jetted by the binder, and the two liquids are mixed at the time of jetting. In the present invention, since the instantaneously solidifying material is used, there is no possibility that these solidifying materials are mixed into the sludge and discharged before the solidification of the solidifying material is completed. Note that, here, an example will be described in which the hardening material is surrounded by the instantaneous binder.

Further, a high-pressure water pipe 52 for feeding high-pressure water and a slime discharge pipe 57 for sending sucked muddy liquid to the ground surface are provided in the injection rod. By the slime discharge pipe 57, a stable and reliable discharge path of the muddy liquid can be secured as compared with a general construction method in which a gap between the injection rod and the drill hole is a discharge path. In addition, in the present invention, as shown in FIG. 1, efficient discharge of the sludge is performed by forcibly sucking the sludge by a sludge pump placed on the ground surface.
The slime discharge pipe 57 has a sufficient diameter so that the muddy liquid can be discharged smoothly. The slime discharge pipe 57 has a discharge port 42 for sucking the discharge liquid at the most proximal end of the monitor. A grid 55 for preventing intrusion of foreign matter is appropriately provided in the mud outlet 42. In addition, an openable door that can be controlled from the ground may be provided to control the amount of discharge.

An in-pipe injection nozzle 51 attached to a pipe branched from the high-pressure water pipe 52 is opened inside the tip of the slime discharge pipe 57. The in-pipe injection nozzle 51 faces the discharge direction of the muddy liquid in the slime discharge pipe 57. Therefore, when high-pressure water is pumped through the high-pressure water pipe 52,
The high-pressure water is also supplied into the slime discharge pipe 57 and is jetted, thereby forcing the discharged muddy liquid in the discharge direction. However, the main role of the high-pressure water supplied by the high-pressure water pipe 52 is to cut the surrounding ground by being injected from the high-pressure water injection nozzle 43. By using part of the high-pressure water for cutting to discharge the sludge,
The energy of the high-pressure water can be effectively used and the structure can be simplified.

The water jetted from the high-pressure water jet nozzle 43 cuts the ground, is absorbed in the muddy water, is sucked, and is collected on the ground. Therefore, the soil particles are removed by the above-described recycling system, and can be reused as high-pressure water.

FIG. 3A shows the injection rod 1 shown in FIG.
FIG. 4 is a schematic cross-sectional view of a swivel 58 provided on the base end side of FIG. FIG. 3 (B) shows the injection rod 14 shown in FIG. 3 (A).
FIG. 3 is a cross-sectional view taken along line AA near the base end of FIG. Swivel 58 has
The respective inlets 53 of the hardening material tube 53 and the binder tube 54
a and 54a are connected to the high-pressure pump 28 for the hardening material and the high-pressure pump 29 for the instant binder of FIG. 1 through the respective injection hoses. Further, the swivel 58 is also provided with an inlet 52a for the high-pressure water pipe 52,
From here, it is connected to the high-pressure water pump 24 of FIG. Further, a discharge port 57a of the slime discharge pipe 57 is provided,
From here, it is connected to the sludge pump 16 of FIG. In the present invention, as shown in the cross-sectional view of FIG. 3 (B), the injection rod 14 has four holes including a hardening material tube 53, a flashing agent tube 54, a high-pressure water tube 52, and a slime discharge tube 57. Tube.

In the construction example implemented using the injection rod according to the present invention, the pressure of the high-pressure water injected from the high-pressure water pipe is 4
00kg / cm ^2, and a flow rate 100 l / min, pressure of 200 kg / cm ² for curing material of the solidifying material, the flow rate of 100 l / mim, pressure 50 kg / cm ² of Madokayui agent, was flow 100 l / min.

[0018]

In the method and apparatus for constructing a ground improvement body according to the present invention, the injection rod is a four-hole pipe provided with a hardening material pipe, a flash binder pipe, a high-pressure water pipe, and a slime discharge pipe. The high-pressure water for cutting is positively collected by a slime discharge pipe as mud, filtered, and recycled as high-pressure water again. The high-pressure water for cutting is also used as a high-pressure water jet for promoting discharge of muddy liquid in the slime discharge pipe. With such a system, the water required for construction can be used efficiently, and the amount of wastewater that is substantially discarded can be drastically reduced. This greatly contributes to the reduction of industrial waste and, consequently, environmental protection.

Further, since the muddy liquid is forcibly discharged, the ground pressure can be prevented from rising even when a large amount of muddy liquid is generated in a large-scale construction. Can be created. In addition to this,
In the present invention, since no air is used, the muddy liquid can be discharged without relying on the air lift effect,
Even in construction in directions other than vertical construction, there is no risk of excessive rise in ground pressure or non-uniformity of the shape of the consolidated body due to stagnation of air. Therefore, according to the present invention, omnidirectional construction is possible, and a desired ground improvement body can be created in any construction direction. In the present invention, since the solidified material has an instantaneous setting property, the solidified material is not mixed with and discharged from the muddy liquid, so that the solidified material is not wasted, and at the same time, the environmental pollution due to the solidified material flowing out can be prevented. .

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an implementation state of a ground improvement body forming method according to the present invention.

FIG. 2 is a schematic cross-sectional view of a monitor 50, which is a tip portion of the injection rod 14 shown in FIG.

3A is a schematic cross-sectional view of a swivel provided on the base end side of the injection rod shown in FIG. 1, and FIG.
It is AA sectional drawing in (A).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ground improvement body preparation apparatus 12 Drive machine 14 Injection rod 15 Sludge discharge meter 16 Discharge pump 17 Desander 18 Cyclone 19 Treatment tank 20, 23 Pump 21 Separated sediment 22 Water tank 24 High-pressure water pump 25 Solidification material plant 26, 27 Flow meter 28 High-pressure pump for hardening material 29 High-pressure pump for flashing agent 30 Drainage 31 Water 32 Sludge 33 High-pressure water 34 Hardening material 35 Flashing agent 42 Mud outlet 43 High-pressure water injection nozzle 44 Hardening material injection nozzle 45 Quick Binder Injection Nozzle 50 Monitor Unit 51 In-Pipe Injection Nozzle 52 High Pressure Water Pipe 53 Hardening Material Tube 54 Instant Binder Tube 55 Drainage Outlet Grid 57 Slime Discharge Pipe 58 Swivel 60 Target Ground 62 Drilling Hole 64 Ground Improvement Body )

Claims (2)

[Claims] 1. A ground improvement on the target ground by drilling a hole in the target ground, inserting an injection rod into the hole, and moving and rotating the injection rod in the drilling direction while injecting a solidifying material. In a ground improvement body forming method for forming a body, a hardening material tube for pumping the hardening material into the injection rod using a hardening material and a flashing agent as the solidifying material, a flashing agent for pumping the flashing agent A pipe, a high-pressure water pipe for pumping high-pressure water, and a discharge pipe for sucking and discharging the muddy liquid are provided, and while the high-pressure water is jetted to the target ground and cut, the hardening material and the instant binder are used. Is concentrically sprayed to form the ground improvement body, a pump device sucks muddy fluid through the discharge pipe, supplies a part of the high-pressure water in the spray rod to the discharge pipe, and In the discharge pipe in the discharge direction of the waste liquid It shines performs soil particle removal process aspirated the exhaust mud fluid, soil improvement material reclamation method characterized by reusing the treated water as the high-pressure water. 2. A ground for forming a ground improvement body on the target ground by injecting a solidifying material while moving and rotating an injection rod inserted into a hole formed in the target ground in the drilling direction. In the improved body forming apparatus, the solidifying material comprises a hardening material and a quick-setting agent, a hardening material tube for pressure-feeding the hardening material provided in the injection rod, a quick-setting agent tube for pressure feeding the quick-setting agent, A high-pressure water pipe for pumping high-pressure water, and a discharge pipe for sucking and discharging muddy liquid, a high-pressure water jet nozzle for jetting the high-pressure water to cut a target ground, and the hardening material and the instant binder. A hardening material injection nozzle and a quick-linking agent injection nozzle arranged to concentrically inject, and a part of the high-pressure water in the injection rod is supplied to the discharge pipe and a part of the supplied high-pressure water is supplied to the discharge pipe. The discharge direction of the muddy liquid in the discharge pipe An in-pipe injection mechanism for injecting, a pump device for sucking the muddy liquid through the discharge pipe, and a sludge liquid processing device for performing a soil particle removal process to reuse the sucked muddy liquid as the high-pressure water. A ground improvement body preparation device characterized by having: