JPS5931793Y2 - Pipe joint combination structure for multi-grout injection - Google Patents

Description

[Detailed explanation of the invention] To summarize, this invention is a pipe joint combination structure that is connected and interposed between a grouting pipe and hoses from multiple grout sources during grout injection used in earthquake improvement work, etc. The invention relates to a supply port having a check valve for supplying at least one grout under normal pressure to the pipe joint and the connecting hose to prevent gel clogging and to prevent mutual backflow. This invention relates to a pipe joint combination structure for multi-grout injection, in which pipe joints having connected discharge ports are combined in series in at least two stages to effectively utilize the mixing effect in the pumping process.

BACKGROUND TECHNOLOGY As is well known, the method of injecting grout during an earthquake has been widely adopted in ground improvement work, etc., and various grouts have been devised and developed to suit the conditions appropriately. .

However, in actual construction, the site conditions are extremely diverse, and there are few simple systems that use a single grout throughout the construction process. A grouting plant 4 connected via a hose 3 to, for example, grouts A, B, C, D
Four different grout sources are connected to improve gelling performance,
Gel time and other materials are designed to suit the ground conditions, and we perform so-called multi-grout injection, which supplies everything from single grout to composite grout.

Problems with the prior art However, in the multi-grout injection that has been commonly used until now, the hose from the grout source is repeatedly connected and disconnected from each pipe joint each time depending on the combination conditions of the grout to be injected. The disadvantage is that the work is extremely cumbersome, the efficiency is low, and the gel time in each process cannot be smoothly connected.
Therefore, there was a disadvantage that a high degree of skill was required.

Furthermore, with the recent focus on pollution problems, each grout has come to have its own unique gel time due to the fact that multiple grouts are mixed in equal amounts in advance during the pumping process. Each time it is desorbed, it must be washed by passing water through it, and its management is also complicated.

Purpose of the invention The purpose of this invention is to solve the problems of the multi-grout joint combination structure based on the above-mentioned conventional technology, and to connect at least two or more stages of pipe joints in series.
While grout is constantly supplied to the pipe joints from the first stage onward, other necessary grouts are also supplied to each pipe joint in a way that prevents backflow to the other pipe joints. It is an object of the present invention to provide an excellent combination structure of pipe joints for multi-grout injection that is useful in the field of ground improvement applications.

Structure of the invention In order to solve the above-mentioned problems, the structure of this invention, which is based on the above-mentioned purpose and the gist of the above-mentioned utility model registration claims, connects and connects a plurality of pipe joints to the injection pipe in series, and when the injection starts, the At least one grout from the first-stage pipe joint is pumped so as to conduct through all the pipe joints to prevent the solidification and closure of all the pipe joints, and the specified grout is pumped to each pipe joint according to the injection conditions. By doing so, the grout does not flow back to the other side, and only the grouts that are press-fitted are mixed in the pipes within the pipe joint and the lower pipe joint, and are reliably injected into the ground.
A technical measure has been taken to enable stepless multi-grout injection without continuous water washing.

Embodiment - Configuration Next, an embodiment of this invention will be described below based on the drawings from FIG. 2 onwards.

Note that the same parts as those in FIG. 1 will be described with the same reference numerals.

In the embodiment shown in FIGS. 2 to 5, A, B, C, and D are grouts with different gel times, gel properties, etc., and are stored in tanks, respectively, and valves Vl and V
2. V3. V4. V'l, V'2. V'3.
V'4 and pressure pump P 1. P2. P3. P
4 to the feed hoses H1, H2, H3, and H4.

Reference numeral 5 designates a first-stage pipe joint that embodies the gist of this invention, and is formed approximately in a T-shape, sandwiching a discharge port 6 between a pair of left and right supply lowers, and seats 8, 8' attached to 7'. Normal ball valves 9, 9' are arranged as check valves, and the supply lower, 7'
and the above-mentioned discharge port 6 can be freely communicated and cut off, and the above-mentioned hoses H1 and H2 are connected.

On the other hand, 10 is a second-stage pipe joint, and its discharge port 11 is connected to the injection pipe 2 via a connecting hose H. Two other supply ports 12 are provided and connected to the discharge port 6 of the first stage pipe joint 5 via a connecting hose H, and therein is a honeycomb plate 14 having holes 13 and 13' as conducting holes. A rubber valve 16 with a conductive slit 15 is used as a check valve, and a clip ring 17 is attached below the valve.
Further, the other two supply ports 18 and 18' on the left and right sides are connected to the hoses H3 and H4.

A ball valve 20.20' is attached to the seat 19.19' of the supply port 18.18' with a resilient spring 21 interposed therebetween as a check valve.

Embodiment - Operation In the above-described configuration, after setting the injection pipe 2 in the specified position in the ground 1, the basic maximum common agreement Grau) A is connected to the valves Vl, V'l.
When the gas is opened and the pressure pump P1 is operated to pump the grout)
A enters the interior of the pipe joint 5 through the hose H1 by opening the reball valve 9, and enters the supply port 12 of the next-stage pipe joint 10 through the connection hose H from the discharge port 6.

In this stroke, the supply lower ' is closed by the ball valve 9' on the opposite side, so that the grout A does not flow back to the hose H2 side.

In addition, the grout A supplied to the pipe joint 10 presses the rubber valve 16 from the hole 13.13' of the honeycomb plate 14, expands the slit 15, and opens the ball valve 20°20'.
Then, the supply ports 18 and 18' are closed, and the water is injected into the injection pipe 2 from the discharge port 11 via the connection hose H.

Of course, as mentioned above, since the supply ports 18, 18' are closed, there is no flow back to the hoses H2, H4.

Therefore, the gel (glow) A flows through the pipe joints 5, 10 from beginning to end, thereby preventing gel clogging of the pipe joints 5, 10.

When injecting grouts B, C, and D according to the injection conditions, pump P2. P3. By actuating P4 in a predetermined manner, the ball valves 9', 20, 20' open correspondingly, and the pipe fitting 5
, 10 and fed to the injection pipe 2.

During this time, there is no backflow to each grout supply source due to the action of each check valve.

In this case, the spring 21 within the fitting 10 takes part in the mixing.

Further, in the pipe joint 10, grout C1 or C9C can be further mixed with the mixed grout of grouts A and H in the pipe joint 5 of the first stage.

Of course, the supply amount can be adjusted at will in the above steps.

Other embodiments Also, the embodiments shown in Figures 6a and 6b are similar to those shown in Figures 3 and 4 above.
There are other embodiments 5' and 10' of the pipe joints 5 and 10 shown in the figure, and the former uses a rubber cup valve 9/10 as a check valve.
/, 9/// are attached to a bar 23 supported by a bracket 22 for the supply lower ", 7"', and a fin stirrer 24 is provided on the bar 23 as a management mixing mechanism to direct it to the discharge port 6'. The supply, occlusion, discharge, mixing action, and effect are substantially the same as in the previous embodiment.

In addition, the latter embodiment shown in FIG. 6b has supply ports 12', 18'',
18"', a rubber cup valve 16' as above,
20'', 20''' are provided oppositely to the bar 23' via a bracket 22', and the bar 23' has a feed port 12', 18'', 18''' that can be effectively pivoted relative to each supply port 12', 18'', 18'''. A spiral fin 24' providing an agitation effect is provided, and another spiral fin 24'' is provided in the opposite direction via a bracket 22'' near the discharge port 11'.

Therefore, the operation and effect are not substantially different from the embodiment shown in FIG.

In addition, in the embodiment shown in Figs. 7 and 8, the pipe joints 10'' are arranged in the same four stages in series, and the pipe joints 10'' are arranged in series in four stages.
・Constructed to connect nine chemical solutions G, H, and I.

The pipe joint 10'' is a combination of the embodiments shown in FIGS. 4 and 6b, except for the pipe mixing 24'', and has substantially the same functions and effects.

In the system embodiment shown in FIG. 7, the same pipe joint 10
'' are arranged in series to conduct direct current to the grout A to avoid gel clogging in each pipe joint 10'', and to mix and inject the desired mixed grout with the others while preventing backflow. Since the mixing is carried out in multiple stages, it is ensured that the mixing is uniformly carried out within the narrow hose or pipe joint.

Effects of the invention According to this invention, in a pipe joint structure that is interposedly connected between an injection pipe and a grout source for multi-grout injection, the pipe joints connected in series in at least two stages are connected to each other in the upper stage. the outlet and one supply port having a lower check valve, such that each fitting connects at least one supply port having another check valve to a hose from the grout source; By doing so, it is basically possible to perform injection with multiple grout sources connected to the supply ports of each pipe joint, and when performing multi-grout injection, each grout source and injection pipe can be connected depending on the injection conditions. There is no need for the troublesome man-hours of repeatedly connecting and disengaging the pipe joints between the pipes, and there is no need to wash them with water each time.As a result, the lining can be done in the set state, which significantly shortens the man-hours and makes it easier in the later stages. It is short, reaction control is reliable, and construction management can be performed accurately, which is an excellent effect.

In addition, since grout is constantly flowing through the pipe joint during construction, no gelation or blockage will occur within the pipe joint or the connecting hose, so even a single grout can be fed.
Therefore, accurate reaction control by equivalent metering on the ground is possible, and an excellent effect is achieved without the risk of poor reaction in the ground or pollution caused by it, such as groundwater contamination.

Moreover, since check valves are installed at the supply ports inside the pipe joints, the grout supplied into each pipe joint will not flow back, thus preventing chemical changes in the grout source. Excellent effects are achieved without the risk of changing the degree of mixing or causing gel denaturation.

Furthermore, by connecting multiple pipe joints in series, multiple
In particular, when a large number of grouts are mixed and injected, they are mixed one after another, so they are mixed reliably even in narrow pipe joints, and they can be injected into the ground in precisely the set equivalent amount and at the planned gel time.

In addition, since it is only necessary to connect pipe joints of the same type according to the design, the manufacture and maintenance of the unit pipe joint is easy, and furthermore, a secondary effect of suppressing an increase in costs is achieved.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of multi-grout injection, Fig. 2 and the following are partially sectional side views illustrating an embodiment of this invention;
The figure is a system diagram of one embodiment, Figures 3 and 4 are enlarged cross-sectional views of the pipe joint in Figure 2, Figure 5 is a cross-sectional view of the enlarged portion of Figure 4, and Figures 6a and 6b are 3°4. FIG. 7 is a system diagram of another embodiment, and FIG. 8 is an enlarged sectional view of the pipe joint in FIG. 7. 2... Injection pipe, A, B-H, I... Grout source, Hl, H2, H3, H4... Hose, 5.5', 10.10' , 10''...Pipe joint, 6, 11.6', 11'...Discharge port, 9.
9', 20.20', 9". gtt22()t', 20///...Check valve,
7.7', 18.18', 7", 7"', 18". 18"'...1 supply port.

Claims (1)

[Scope of utility model registration request] In a combination structure of a pipe joint interposed between hoses from a plurality of grout sources connected to the injection pipe and the injection pipe, the pipe joint is connected in series to the injection pipe in at least two stages, and each fitting has an outlet connected to the outlet and at least one supply inlet having a check valve connected to a hose from a corresponding grout source. Pipe joint combination structure for grout injection.