JPH1068123A - Soil improvement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control energy loss of grout to be jetted from a high-pressure pump through a branch section of a monitor connected to the lower end of a rod in long process. SOLUTION: In a soil improvement device, straight-line grout feed passages 10' and 10' having flow straightening efficiency are communicated from a branch section 9' to nozzles 11 and 11 through the branch section 9' in a rod 1 through double pipe system feed passages 3 and 4 inside the rod 1 connecting a specific number of stages through joints 2, 2... by communicating a monitor section 8' in a straight line. Thereby since no branch section exists in the monitor section 8, the length of the monitor section 8' is shortened, it is miniaturized to simply connect to the upper rod 1, work efficiency is promoted, service efficiency is improved as well as safety, unexpected accidents caused by a fallen object, etc., into a boring of the monitor section 8' can be prevented, and execution with high degree of accuracy is carried out safely in accordance with a plan.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The disclosed technology belongs to the structural technical field of a soil improvement device for injecting a large amount of hardening material such as cement milk, water or the like into a ground by a high-pressure injection pump in a ground improvement work.

[0002]

2. Description of the Related Art As is well known, in Japan, where there are many mountain forests and special terrain close to a long and intricate coastline, residential and agricultural areas, as well as agricultural and livestock areas, are used. The plains used for various industrial facilities are extremely narrow and limited. Therefore, the technology to improve and effectively use the soft ground in the basins such as shallow shores, rivers, lakes and marshes is extremely important. Ground improvement technology has been researched and developed and put to practical use.

[0003] Among them, an improvement material such as cement milk or water, etc., which is pressurized by a high-pressure pump such as a so-called high-pressure injection stirring method, is fed, and energy is lost from a nozzle of a monitor unit provided at the tip of the rod. It is one of the most important conditions to ensure the design creation in the ground without blowing out.

For example, cement milk used in the JSG method has been 60 liters per minute, but recently, a high-pressure pump with a large injection rate has been developed and exceeds 200 liters and 400 liters to reach 600 liters. Although the increase in the diameter of the ground in the ground has been promoted in such a way, the supply of such a large amount of improvement material and water is limited by the upper limit of the mechanical device due to the rod diameter and the diameter of the monitor. As a result, an increase in the flow velocity is inevitable, and turbulence is inevitably generated in the feed passage formed in the rod and the monitor, causing energy loss.

More specifically, as shown in FIG. 2C, in a ground improvement apparatus used in a conventional high-pressure injection stirring method, a rod 1 is connected to a predetermined length via joints 2, 2, 2,. A passage 3 for feeding an improving material such as cement milk, and an air supply passage 4 which forms the passage 3 concentrically are formed in a double pipe system therein. 6 and air 7, and two supply passages 10, 10 are formed in a monitor section 8 connected to the lower end of the rod 1 via a branch section 9, and the nozzle 1 at the end thereof is formed.
From 1 and 11, air is blown around the improving material such as cement milk in a surrounding state, and is blown out and injected into the ground as a jet 12.

Therefore, turbulence is unavoidable in the branch section 9 of the monitor section 8, and the length l ₁ of the monitor section 8 exceeds ₁ m, for example, 1.5 m or more. Supply path 10, which is a mechanism having
The diameter of the rod 1 becomes complicated due to the structural complexity such as 10
Is about 90 mm to 142 mm, but in the monitor section 8, the diameter φ must be larger than the diameter of the rod 1 due to the formation of the two supply passages 10 and 10. And the monitor section 8 alone had a large weight exceeding 100 kg.

For example, as shown in FIG. 2D, in order to equip a frame drilling machine 13 as a boring machine 13 with an apparatus in which a monitor section 8 is directly connected to and integrated with a rod 1, as described above. Since the diameter of the monitor section 8 is larger than that of the rod 1, it cannot be inserted through the spindle 14 of the boring machine 13 and, therefore, the ground 15 below the spindle 14 can be predeterminedly drilled by another drilling machine. The monitor section 8 is connected to the lower end of the rod 1 that has been inserted through the spindle 14 from above using a large-diameter bore 16 that has been bored. ,
Due to the large weight of the monitor unit 8 and the complexity of the mechanism unit, the connection and connection work is complicated, the handling man-hour is large, and the workability and serviceability in mounting connection and connection are poor.
There is a disadvantage that the monitor lacks safety, and in the case of unexpectedness, there is a disadvantage that the monitor 8 is mistakenly connected to the rod 1 and the monitor 8 is dropped into the hole 16. It is impossible to lift and recover the unit 8 because of its substantial weight, and the expensive monitor unit 8
There was a disadvantage that it had to be discarded.

[0008] The monitor section 8 is made longer and larger from the point that the rectification path is formed by the passages 10, which are branched into two systems via the branch section 9 in the monitor section 8. Is the bottleneck of the largest problem.

Therefore, since the monitor section 8 has the structure of the predetermined number of the plurality of nozzles 11, 11,..., The structure is complicated because two rectifying passages 10, 10 are formed. In order to form the predetermined lengths of the two rectifying passages 10 and 10 up to 11, the length of the monitor unit 8 becomes long and the structure becomes complicated, and as a result, a large weight exceeding 100 kg and a high cost It had to be a monitor part, causing the problems described above.

[0010]

It is an object of the present invention to provide a turbulent flow in a passage from a rod to a monitor by a large injection high pressure pump for a large supply used in the high pressure injection stirring method based on the prior art. It is a technical issue to solve the problem of the long and large monitor part that causes energy loss, and while premising on the structural neck that the monitor part cannot be made larger than the rod in terms of diameter,
A branch passage is provided in the rod to maintain the rectification of the two systems of passages in the monitor section, to shorten and narrow the monitor section, and to improve the workability and serviceability of connecting and connecting the rod and the monitor section. To improve the safety, improve the cost and reduce the cost.Also, the use of the high pressure high pressure pump can be operated according to the original design use, and the ground improvement as designed can be performed. The purpose of the present invention is to provide an excellent ground improvement device that benefits the civil engineering application field in the construction industry.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a configuration of the invention of this application, which has the above-mentioned objects and which has a swivel at an upper part and a predetermined number of steps via a joint, in order to solve the above-mentioned problems. Inside the rod of a predetermined length by the connected joint rod, a double pipe passage of a passage for an improving material and an air supply passage concentrically surrounding the passage is provided,
A branch portion is provided in a joint rod at a desired portion to form a rectifying two-system passage in the rod, or a branch portion is provided in a joint rod immediately below a swivel to form a two-system rectifying passage in the entire length of the rod. The turbulence is not generated in the improvement material flowing through each passage in each passage, and the flow is rectified, and only two systems of rectification passages are provided at the monitor portion provided at the tip of the rod, and each of the nozzles has The length of the monitor section is shortened by communicating with the nozzle that balances in the circumferential direction, and the connection of the monitor section to the lower end of the rod in the spindle of the boring machine is facilitated, its workability and serviceability are good, and safety is high. And technical means for avoiding cost disadvantages due to unexpected drops and the like are taken.

[0012]

When the ground is improved, a predetermined improving material or air is supplied from the swivel on the upper part of the rod, and the air flows through the double pipe type passage of the rod to communicate with the nozzles which are balanced in each circumferential direction. The two paths from the branch that forms the two paths to the nozzles of the monitor section maintain sufficient rectification, prevent turbulence due to the flow of the improved material by the high-pressure pump, and reduce energy loss. In a state where it is suppressed as much as possible, the improved material is injected from the nozzle into the ground to form a structure as large as possible as designed, and the connection of the monitor part to the rod, etc. Workability and serviceability are improved, and furthermore, such work is performed extremely safely and accurately.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which the invention of this application is to be implemented will be described with reference to FIG.

The same parts as those in FIG. 2 will be described using the same reference numerals.

In the embodiment shown in FIG. 1A in the embodiment shown in FIG. 1, A is a ground improvement device which forms the center of the gist of the invention of this application, and a rod occupying most of the length thereof. Numeral 1 designates a predetermined length through joints 2, 2, 2,..., And a double pipe type passage is provided at the center of the uppermost joint rod with a supply passage 3 for an improving material, and a supply of the improving material. An air supply passage 4 is disposed concentrically outwardly around the passage 3, and the double-tube passages 3, 4 are provided in the second-stage joint rod next to the uppermost joint rod. The air passages 10 '' are formed in a double pipe system outside the respective improved material passages 10 'and the respective improved material passages 10' via a branch portion 9 ', and the air passages 10''pass straight through the lowermost joint rod in the two systems. To the monitor 8 ', and baluns on both sides of the monitor 8'. Is an improved material jetted in communication with the nozzles 11, 11 arranged to face so as to be better, so as to jet the surrounding air around the modifying material to output 該噴.

In the monitor section 8, the provision of the nozzle 11 on only one side is not possible because the reaction force of the jet 12 (especially in the case of large energy) breaks the balance due to the reaction force of the jet 12 in rotating and pulling up the rod 1. In order to form a structure as designed, the nozzles 11 are provided in pairs in the opposite direction in the radial direction, or three or four or more bodies (theoretically) in a well-balanced manner. The larger the injection amount, the better the balance of the nozzles 11, 11,..., So that a large-diameter compact as designed is formed.

Therefore, in the embodiment of this embodiment, no branching section is provided in the monitor section 8 ', and two parallel rectifying passages 10', 10 ', 10'',10',
10 ″ is arranged and formed, and its axial length l ₂ is the same as the conventional monitor unit 8 shown in FIG.
2 is significantly shorter than the axial length l ₁ and the diameter thereof is also reduced. Therefore, the diameter is smaller than the diameter of the spindle 14 of the frame drilling machine 13 of the boring machine shown in FIG. Even when the diameter of the monitor part 8 'is larger, even when the monitor part 8' is connected to the lower end of the rod 1 via the joint 2 'from below, it is drilled due to its light weight and small size. When connecting and connecting work from the 16 side, workability and serviceability are good, and moreover,
Since it is easy to handle, safety is high and work can be performed smoothly without dropping.

Therefore, in this embodiment, FIG.
As shown in (d), when the monitor portion 8 'having a diameter slightly larger than the diameter of the spindle 14 of the frame drilling machine of the boring machine is connected and connected to the lower side of the rod 1,
As shown by the black arrow in FIG. 6, there is no danger of dropping, and the connection can be safely and accurately connected.

In the above construction, when the ground improvement is performed, the monitor section 8 'is attached to the rod 1 by a boring machine.
In order to perform a predetermined ground improvement work by clamping the ground improvement device A to which the ground improvement device A is connected and to perform a predetermined ground improvement work, the improvement material 6 such as cement milk and the air 7 are fed from the swivel 5 at the upper end, and the rod is fed. 1 is coaxially fed from the joint rod at the upper end of the pipe 1 through the double-tube type passages 3 and 4, and is divided into two systems of rectifying passages 10 ', 10' and 10 'by the branch portion 9'.
2 to feed the improvement material 6 and air 7 from ', 10''
Since the rectifying passages 10 ', 10' of the system are arranged in a straight line, turbulent flow is generated up to the nozzles 11, 11 of the monitor unit 8 '. The energy loss due to the flow is suppressed as much as possible, and is jetted from each nozzle 11 as a jet 12, injected into the ground, and a predetermined formed body is formed as designed by rotating and pulling up in FIG.

Next, in the embodiment shown in FIG. 1B, in the form of the ground improvement device A 'of the embodiment of the rod 1 shown in FIG. The monitor unit 8 is connected to the joint rod via the lowermost joint 2 '.
′, A branch portion 9 ″ is formed in the joint rod immediately above, and up to the branch portion 9 ″, the double pipe flow passage 3,
4 is formed concentrically, and a branch portion 9 ″ is formed at the joint rod immediately above the monitor portion 8 ′, and two linear parallel lines are formed from the branch portion 9 ″ to the monitor portion 8 ′. The passages 10 ′, 10 ′, 10 ″, 10 ″ are formed, the turbulence is not formed, and the rectification state is maintained, and the monitor unit 8 ′ is formed.
And the communication passages 10 'and 10''leading to the nozzles 11 and 11 are formed. In this embodiment as well, a branch portion for forming a turbulent flow is not formed in the monitor portion 8'. Therefore, the monitor section 8 'is not provided with a branch section for forming a two-path path for forming a long-step rectification, and therefore, the monitor section 8' is implemented in the manner shown in FIG. Similarly to the aspect of the embodiment, the length l ₂ in the longitudinal direction does not require two long paths which form the rectified passage 10 of the monitor unit 8 shown in FIG. The length of the rod 1 is short, and, like the embodiment of FIG. 1A, the lower end of the rod 1 inserted into the spindle 14 of the boring machine 13 of FIG. The best workability of connecting and connecting 8 ' Sex is also good safety is high, there is no risk of causing a situation, such as unexpected fall.

In the embodiment shown in FIG. 1B, two systems of rectifying passages 10 'and 10' for maintaining the rectification of each nozzle 11 of the monitor section 8 'are provided in the monitor section 8'. Is branched from a branch portion 9 ″ formed on the joint rod immediately above the monitor portion 8 ′. However, as a design mode, the branch portion 9 ″ is formed on the joint rod immediately above the monitor portion 8 ′.
Rather than forming the second stage, 3
It is also possible to form it on the joint rod above the step.

It should be noted that the embodiments of the invention of this application are not limited to the above-described embodiments. For example, the present invention can be applied not only to the column jet or super jet method but also directly to the JSG method. Various aspects can be adopted.

[0023]

As described above, according to the invention of the present application, basically, in the ground improvement apparatus, a feed passage of an improving material such as cement milk formed in a rod by a double pipe system and the like are concentric with the passage. A linearly formed passage that maintains the rectification of the two systems that communicates with the nozzles that are arranged to form two systems of circumferential balance through the branch portion from the air passage that is formed so as to surround the two passages; By providing the two paths so as to communicate with the respective nozzles of the monitor section, the monitor section only needs to be provided with the nozzle section, so that the length of the monitor section is significantly reduced, and the size thereof is reduced. As a result, when connecting to the spindle of the boring machine from the lower part of the rod, the workability and serviceability are good, the connection can be made safely and accurately, and the workability is reduced because the size and weight are reduced. Yasa It has good screwing properties and high safety, so it is impossible to recover by dropping the monitor part into a drilled hole that was unexpectedly drilled beforehand, preventing disadvantages such as high cost and good workability. An excellent effect of shortening the construction period and improving the working accuracy is achieved.

Also, by providing two systems of linear passages communicating with each nozzle of the monitor part at a predetermined portion of the rod or directly above the monitor part, the passage from the boring part to the nozzle is made of two systems of straight lines. Turbulence is prevented, rectification is maintained,
Energy loss in the injection process of the improved material of the high-pressure pump to be used is suppressed, and the operation efficiency of the high-pressure pump is improved.

In addition, as in the conventional mode, a branch portion is formed in the monitor portion, and it is not necessary to form two rectifying linear passages communicating from the branch point to the nozzle. In addition, there is an advantage that the cost can be reduced, maintenance, inspection, maintenance, etc. can be easily performed, the running cost is low, and the durability is improved.

Although a pair of nozzles is mounted on the opposite side to improve the balance due to the unbalance of the jets, three or four nozzles can be formed with good balance depending on the design. .

However, in this aspect, the structure may be complicated because the improvement material for each nozzle or the air supply passage is connected to the upper double pipe passage while maintaining rectification.

[Brief description of the drawings]

FIG. 1A is a partial longitudinal sectional side view of one embodiment of the present invention, and FIG. 1B is a partial longitudinal sectional view of another embodiment.

FIG. 2 (c) is a partial longitudinal sectional view of a ground improvement device based on the conventional technology, and (d) is a schematic side view of a connection connection mode of a rod and a monitor to a spindle of the boring machine based on the conventional technology. .

[Explanation of symbols]

 3 Improved material feeding passage 2 Joint 11 Spout nozzle 8 'Monitor part A, A' Ground improvement device 1, 1 'Rod 9, 9' Branch part 10 ', 10' 'Straightening passage

Claims (3)

[Claims] An end portion of a rod connected via a joint of a predetermined number of stages having an improved material supply passage therein is connected to a monitor portion provided with a plurality of improved material ejection nozzles in a circumferentially balanced manner. In the ground improvement device, the feed passage for the improved material contained in the rod is branched and communicated with the plurality of nozzles for ejecting the improved material, and is formed as a straight rectifying passage from the branch portion to the connection portion of the monitor unit. A ground improvement device characterized by the following. 2. The ground improvement apparatus according to claim 1, wherein the straightening passage is formed linearly over substantially the entire length of the rod. 3. The ground improvement according to claim 1, wherein said branch portion is formed in a joint rod in the middle of the rod, and a rectification passage is formed from said joint rod to a monitor portion. apparatus.