JPS6343235Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The disclosed technology belongs to the technical field of construction work in which chemical solutions are injected into soft ground, etc.

<Summary of the gist> This invention involves inserting an outer pipe into a hole in the improved ground made by a casing pipe, and inserting and removing the inner pipe into and out of the outer pipe. This invention relates to a chemical liquid injection pipe structure in which a packer that can be pressed against and retracted from the inner surface is installed in a ring at the top and bottom positions at its tip, and the packer is connected to a control device on the ground. The tube consists of a tip tube and a flexible tube for feeding a drug solution connected to the tip tube, and further, the tip tube is divided into two bendably through a short flexible tube, each having a connector, and This invention relates to a chemical liquid injection tube structure in which a flexible tube through which a pressure fluid inserted into the flexible tube flows is communicated with the pressure chambers of each packer.

<Prior Art> As is well known, chemical injection methods have been widely adopted for soil improvement, etc., and various methods have been devised so far.

Among the construction methods used in the seed chemical injection method, there is a so-called strainer injection method, and the chemical injection pipe used in the strainer injection method was invented in the applicant's earlier application, Utility Model Application No. 55-21334. The seed chemical injection tube 1 is explained based on FIGS. 1 and 2.
has an outer pipe 3 made of, for example, PVC, which is inserted into a hole in the improved ground formed by a casing pipe, etc., and an inner pipe 4 made of metal, which is inserted into and removed from the inside of the outer pipe 3. A flexible membrane 7 made of rubber or the like is attached to the circumferential surface of the tube 3 so as to be expandable and contractible, covering the plurality of jetting ports 5, 5, . . . and having injection slits 6, 6, .

In addition, the inner tube 4 is provided with a ring of pads 8, 8, etc. for the inner surface of the outer tube 3 at the upper and lower positions of its tip, etc.
The portion narrowed by the packers 8, 8, . . . can be freely set at a position corresponding to the flexible membrane 7 of the outer tube 3.

<Problems to be solved by the invention> However, in the case of the seed chemical injection pipe 1, if the hole to be drilled into the ground is very deep, the hole will inevitably be partially curved during drilling. Because of this,
As shown in FIG. 2, even if the outer tube 3 made of PVC could be inserted, there was a drawback that the inner tube 4 made of metal could not be inserted at the curved portion.

Therefore, in order to increase the packing effect, the inner tube 4 is provided with packs 8, 8, . When the inner tube 4 is inserted, a large insertion force is required against the resistance of the snappers 8, 8... that slide into contact with each other at the curved portion, so the inner tube 4 must be made of a highly rigid material such as metal. The disadvantage was that it required a large amount of power and was not worth the cost.

In addition, if the hole is very deep, the snaps 8, 8, etc. of the inner tube 4 inserted from the ground into the outer tube 3 will have friction with the inner surface of the outer tube 3 as described above. There was a problem in that insertion force was required mechanically in order to set against the force.

Therefore, for example, in the underground pipe technology as shown in the invention disclosed in Japanese Patent Application Laid-Open No. 57-22494,
Regarding the part that is inserted into the ground in a curved shape, there is a technology that can be used for flexible pipes, but the technical field is different between this type of underground pipe technology and the chemical injection technology according to the invention of the present invention, and appropriate diversion is not possible. There are some inconveniences that I dislike.

<Purpose of the invention> The purpose of this invention is to solve the technical problem of the chemical injection tube related to strainer injection based on the above-mentioned conventional technology, and to make it possible to smoothly insert the inner tube into the outer tube and prevent damage to the pipe. etc., and furthermore,
Even if the outer pipe inserted into the drilled hole is curved, it curves and follows the curve, allowing the pipe to be inserted smoothly, and to provide an excellent chemical injection pipe structure that is beneficial to the field of ground improvement technology application in the construction industry. It is something to do.

<Means/effects for solving the problem> In accordance with the above-mentioned purpose, the structure of this invention, which is based on the scope of the above-mentioned utility model registration claim, is to solve the above-mentioned problem by installing a casing pipe from the ground to the improved ground. After drilling a hole to a predetermined depth using a predetermined means such as Then, the inner tube is inserted into the outer tube from the ground, and the inner tube is bent into the drilled hole by a tip tube that is divided into two parts via a short flexible tube and a flexible tube connected to the tip tube. It is inserted smoothly along the inside of the inserted outer tube, and during that time, the packer is in a reduced diameter state and does not interfere with the inner surface of the outer tube, and after being set at the specified position with respect to the outer tube, it is inserted above and below the flexible short tube. Pressure is applied to the pressure chamber of the padska surrounding the outer tube through a control device on the ground connected to the flexible tube through which the pressure fluid flows down, and the padsuka is expanded and pressed against the inner surface of the outer tube. A chemical solution is sent from the control device on the ground through the nozzle of the tip pipe and is injected between the above-mentioned packs, and then through the spout of the outer pipe, through the slit of the flexible membrane, and into the ground through the sealing material. A technical measure has been taken in which the drug solution is sequentially injected while the inner tube is pulled up.

<Embodiment - Configuration> Next, one embodiment of this invention will be described as follows based on the drawings from FIG. 3 onwards. Note that the same parts as in FIGS. 1 and 2 will be described using the same reference numerals.

In the embodiment shown in FIG. 3, reference numeral 1' is a strainer-type chemical injection pipe that forms the center of the gist of this invention.
The outer pipe 3' made of PVC, which is inserted as described above through
A cylindrical rubber membrane 7' having a large number of injection slits 6', 6', etc. is provided at a position covering the outer tube 3', and an inner tube 4' is inserted into the outer tube 3' through a set gap Δd. It is made to be done.

Thus, the inner tube 4' is connected to the tip tube 10 and the tip tube 1.
0 and a hard rubber high-pressure hose 11 as a flexible pipe connected to a ground control device (not shown).
It consists of

The tip tube 10 is made up of a rubber short hose joint 12 as a flexible short tube in the center, and two metal short tubes 13, 13 above and below the joint 12. The metal short tubes 13, 13 each have a pressure chamber 14 and are provided with a rubber cylindrical packer 15, which can be inflated and deflated.
15 is annularly disposed via annular brackets 16, 16 . . .

It should be noted that it is also possible to design the packers 15, 15 to have net-like thread mixed therein in order to increase their strength.

A flexible tube 17, which is connected to the tip tube 10 and which allows pressure fluid to flow down, is connected to the pressure chamber 1 through the inside of the high-pressure hose 11 and connected to a control device (not shown) on the ground.
It is connected to 4 and 14.

The space between the flexible pipe 17 through which the pressure fluid flows down and the high pressure hose 11 is used as a chemical liquid feeding passage.

In addition, the above-mentioned patchers 15, 15 and rubber joint 1
A predetermined number of nozzles 18, 18, .

<Embodiment - Effect> In the above-described configuration, as shown in FIG. 4, a hole is formed in the improved ground 2 to a predetermined depth using a casing pipe 19 using a device not shown, and then,
As shown in FIG. 5, after inserting the outer tube 3' to a predetermined depth, as shown in FIGS. After filling the spaces between the holes, the inner tube 4' is inserted into the outer tube 3'.

In the process of inserting the inner pipe 4', the inner pipe 4' inserted into the outer pipe 3' is inserted into the improved ground 2 with the outer pipe 3' curved as shown in FIG. However, due to the flexibility of the rubber joint 12 and the high pressure hose 11, the rubber joint 12 and the high pressure hose 11 can be smoothly inserted into the outer pipe 3' which is curved and inserted into the ground 2, while following this and curving. 15, 15 are reduced in diameter to the same diameter as the short metal tube 13, a sufficient gap is formed and maintained between the tip tube 10 and the outer tube 3', and therefore the sliding resistance is small. This avoids damage to the packs 15, 15.

In this way, when the inserted inner tube 4' faces the lowermost position of the rubber membranes 7', 7', 7', etc. of the outer tube 3', the inserted inner tube Pressurized water is fed under pressure to the inner pipe 4' from a control device (not shown) on the ground through a flexible pipe 17 that allows pressure fluid to flow down, and thereby the packers 15, 1 of the inner pipe 4'
5 expands outward and presses the inner surface of the outer tube 3',
The inside of the outer tube 3' narrowed by each packer 15 is made into a sealed space.

Then, when the chemical liquid 20 is fed under pressure from a ground control device (not shown) through the high-pressure hose 11, the chemical liquid 20 fills the space between the packers 15 and 15, and when a constant pressure is reached, the outer tube 3' Spout 5', 5'
... is injected into the ground 2 through the injection slits 6', 6', etc. through the expansion of the rubber membrane 7'.

After a predetermined injection, the pressure feeding of the chemical solution is stopped, the diameter of the packers 15, 15 is reduced, and the inner tube 4' is pulled up to the position of the next upper rubber membrane 7', and the next injection is performed.

In this manner, while the inner tube 4' is being pulled up, the chemical solution 20 is sequentially injected into the rubber membranes 7' formed at predetermined intervals on the outer tube 3', thereby achieving a predetermined improvement.

It goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiments. For example, the flexible tube or short flexible tube may be made of metal and have flexibility, and the flexible tube or short flexible tube may be made of metal and provided with flexibility. The fluid to be used is not limited to water, but may also be a gas such as air, and various embodiments such as providing a valve in the nozzle of a short metal tube can be adopted.

<Effects of the invention> As described above, according to this invention, basically the inner tube inserted into the outer tube can be inserted and removed very smoothly, resulting in good workability and extremely short insertion and removal time. This has the excellent effect of being able to shorten the time.

Further, the inner tube is composed of a tip tube and a flexible tube connected to the tip tube, and the tip tube has upper and lower metal short tubes each having a nozzle communicating with the flexible tube with a short flexible tube in between. By having this, the tip of the inner tube has flexibility, and when inserted into the ground,
An excellent effect is achieved in that the inner tube can be easily set and reset when inserting and removing the inner tube into the outer tube which is inevitably curved in the ground.

Furthermore, since the pressurized fluid flowing flexible tube inserted into the flexible tube is connected to the pressure chamber of the packer, the packer can be freely expanded and contracted in the radial direction. Therefore, when inserting and removing the inner tube into the outer tube, the packer can be fully contracted, which significantly reduces the friction between the packer and the inner surface of the outer tube, thereby extending the life of the packer and reducing the power cost required to counter the frictional force.

In addition, since the time required to insert and remove the inner tube from the outer tube is shortened, the construction period is shortened, which has the additional benefit of substantially saving construction costs.

[Brief explanation of the drawing]

Figures 1 and 2 are partial cross-sectional views of a conventional chemical liquid injection tube, Figures 3 and below show embodiments of this invention, Figure 3 is a partial cross-sectional view of a chemical liquid injection tube, and Figures 4-
FIG. 8 is a schematic sectional view of the process, and FIG. 9 is a sectional view showing the curved insertion state of the drug solution injection tube. 4'... Inner tube, 10... Tip tube, 11... Flexible tube, 12... Flexible short tube, 13... Metal short tube, 1
8... Nozzle, 15... Packer, 17... Pressure fluid flow down flexible tube, 14... Pressure chamber, 1'... Chemical liquid injection tube.

Claims (1)

[Scope of utility model registration request] The inner tube, which is inserted into and removed from the outer tube, is pressed against the inner surface of the outer tube so that the inner tube can be freely retracted and retracted.The inner tube is provided with a ring at the upper and lower positions of the tip of the inner tube, so that the inner tube can be inserted into and removed from the outer tube. In the chemical liquid injection tube structure connected to the control device, the inner tube is composed of a tip tube and a flexible tube connected to the tip tube, and the tip tube is further connected to a short flexible tube and the flexible short tube. A pair of short metal tubes, each having a nozzle communicating with the flexible tube, each having a stopper, and allowing the pressurized fluid inserted into the flexible tube to flow downward. A chemical liquid injection tube structure characterized in that a flexible tube communicates with a pressure chamber of each packer.