JPS6081578A - Three-way flow control valve for grout - Google Patents

Abstract

PURPOSE:To simplify construction and facilitate maintenance, by providing a valve body which is inserted into a sleeve, is moved through sliding or rotational sliding, and controls a flow rate by cooperating with an opening part of the sleeve. CONSTITUTION:The valve body 16 is moved in the sleeve 15 through sliding or rotational sliding by driving a driving gear. When the valve body 16 is located on the opening part 15a of the sleeve 15, a grout flowing in through an inflow port 7a is divided to the outflow port 7c side and the outflow port 7b side by the valve body 16 when passing through the opening part 15a, and the flow rates of the grout portions flowing to the port 7c side and the port 7b side are determined by the cross-sectional areas of the opening part 15a divided by the valve body 16. Accordingly, the flow rate of the grout passing through the port 7c and that through the port 7b can be arbitrarily controlled by arbitrarily regulating the position of the valve body 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is used for ground improvement methods and the like in dam construction work. The present invention relates to a three-way flow rate regulating valve used in a grout injection control system.

Normally, in ground improvement work in which grout, which is mainly made of cement and water, is injected into the ground to improve the ground, the flow rate and pressure are maintained within specified values depending on the conditions and depth of the ground to be injected. Construction is instructed by construction specifications, etc.

One method is to save the amount of grout injected into the ground and maintain the pressure within the specified value. One method is to use a variable discharge type grout pump and inject grout while maintaining the flow rate at the specified value in the initial stage of injection. There is a known method in which the pressure is gradually increased until it reaches a predetermined value, and then the injection is performed while maintaining the pressure at a predetermined value by gradually decreasing the discharge amount. However, in this method, the discharge rate of the grout pump decreases as the injection progresses, and eventually becomes a minute flow rate of less than a few minutes per minute. If injection at such a small flow rate continues, the cement particles in the pipe will settle and begin to harden, clogging the pipe, and if the pipe is long, it will take a lot of time for cleaning etc. In addition, variable discharge grout pumps are large, difficult to work with on site, and expensive, so OJ is not suitable for grout injection.
There are very few occasions when an i-discharge type grout pump is used.

For this reason, a small and inexpensive constant discharge type grout pump is usually used, and the grout storage tank and the suction port of the grout pot are connected through a suction pipe, and a supply pipe is connected to the discharge port of the grout pop. A branch point is provided at the end of the branch point, and a return pipe for returning surplus grout to the storage tank, suction pipe, or suction port of the grout pump is connected to the injection pipe, and an automatic three-way connection is made at the branch point. In addition to disposing a flow rate regulating valve, a flow rate detector for detecting the flow rate of grout flowing through the perspiration pipe, that is, the injection amount 7, and a pressure detector for detecting the injection amount 7 are disposed in the injection pipe, and the flow rate detector and the pressure The signal detected by the detector and the specified values of flow rate and pressure specified by construction specifications etc. are set in the flow rate pressure control device, or the flow rate is transmitted from an external grout management device etc. that is stored in advance. A method has been developed to control the injection volume and pressure by comparing the detected value with a specified value (hereinafter referred to as the set value) using a flow rate pressure control device, and operating an automatic three-way flow control valve so that the detected value approaches the set value. A special application was filed in 1977. 20gkg
It has been filed as No. 3.

In this method, since the injection resistance of the ground is low at the beginning of grout injection, the pressure does not rise against the flow rate and pressure limits stipulated in the construction specifications, etc., and the flow rate tends to exceed. In the final stage, the pressure tends to rise and exceed the specified value, and in the middle stage, a phenomenon occurs in which the flow rate and pressure exceed at the same time or alternately. That is, the initial stage of grout injection requires quantitative injection, the middle stage requires simultaneous or alternating control of quantitative and constant pressure injection, and the final stage requires constant pressure injection control, and the flow rate tends to gradually decrease as the injection resistance increases.

In the control to maintain these flow rates and pressures at specified values, the amount is controlled by automatic three-way flow rate adjustment valves installed at the branch points of the supply line, return line, and injection line. By returning the grout to the paper storage tank, the suction pipe, or the suction port of the grout pump, the amount of injection can be controlled as a result.Also, the opening degree of the automatic three-way flow control valve can be adjusted. Therefore, when the injection amount changes, the pressure changes due to the resistance of the ground, so the pressure can be controlled by the opening of the automatic three-way flow control valve installed at the branch point, similar to leaf growth control. 8 The method described above According to the authors, the only part of each duct that is likely to be clogged due to hardening of cement is the short injection pipe, which requires less maintenance work and is superior in workability compared to the variable discharge type grout pump mentioned above. Therefore, in dam construction, etc., it is recommended to use a grout injection control system that combines a constant discharge value grout pump and a three-way flow control valve installed at the branch point of the supply pipe, return pipe, and injection pipe. j
It is extremely effective.

This is a phenomenon that often occurs during low-pressure injection of consolidation grout and blanket grout that treats the surface layer of the ground.When returning surplus grout to a storage tank using the automatic three-way flow control valve described above, pressure loss in the return pipe occurs. When the set injection pressure is lower than the phase of the head caused by the height difference between the storage tank and the injection port (more precisely, the position of the pressure detector), and the injection resistance of the ground is lower, If grout flows in by gravity at a flow rate higher than the specified flow rate, the grout injection control system that combines the above-mentioned constant discharge type grout pump and automatic three-way flow rate A control valve can arbitrarily adjust the flow rate on the injection pipe side. It is possible to control the grout flow and pressure under any conditions, and it can be said to be the most effective grout injection control system for ground improvement work in dam construction methods.

However, if rubber is used for one valve seat of an automatic three-way flow regulating valve used in such a grout injection control system, cement particles may be included in the fluid passing through and the injection When the pressure is high, the pressure difference that occurs between the flood supply side and the return side of the three-way flow adjustment valve becomes large, and the fluid passes through the 9P seat at a flow rate of ρ11 due to the Ff force difference. One bottle made of particles, the ratio is unmatched.
l We also use abrasion-resistant rubber selected for each samurai.
There may be cases where JL becomes unusable. Therefore, in order to improve the wear resistance of the valve seat, the valve seat Y may be made of ceramic as well as the valve body. The structure becomes complicated due to the core problem with the body.
However, considering that it is difficult to provide a three-way flow rate, A valve at a low cost, and there are problems with on-site maintenance, this invention has been made with the above in mind. U1
3 Ming's three-way flow rate adjustment valve for Darout consists of a sleeve with an opening in the side wall disposed inside the valve case, and a sliding or rotating valve inserted into the sleeve.
Ip + L, and a valve body that can adjust the flow rate in conjunction with the opening of the sleeve? A special feature is that an inlet is provided in the valve case communicating with the opening of the sleeve, and an outlet is provided on both sides of the sleeve.

The present invention will be described in detail below with reference to embodiments of the accompanying drawings. FIG. 1 shows a system diagram of a grout injection control system/example, in which 1 is grout temporarily stored in a storage tank 2. The cloud 1 in the storage tank 2 is constantly stirred by a stirrer 3. The suction ports of the storage tank 2 and the grout pot 4 are connected by a suction pipe 5, and the discharge port of the ground pump 4 is connected to a supply pipe 6. It is connected to the i+lE lower lower a of the automatic three-way flow regulating valve 7, and the return pipe 8 is connected to the outflow lower b of the automatic three-way flow regulating valve I, so that the excess grout is returned to the excess grout storage tank 2 through the return pipe 8fa0. It is being done. In addition, an injection pipe line 9 is connected to the other outlet γC of the automatic three-sided I quantity adjustment valve T, and the injection pipe line 9 is connected to the injection inlet 10a of the injection pipe 10 that has been drilled in the ground (2). The injection pipe line 9 is provided with a flow rate detector 11 and a pressure detector 12 that detects the pressure in the injection line. The flow rate pressure control device 13 compares the pressure signal with preset flow rate and pressure set values and controls the detected value to approach the set value.
The automatic three-way flow rate adjustment valve 7 is actuated by the operation.

In the grout injection control system described above, the injection pressure is
If the head due to the pressure loss of the return pipe 8 is higher than the head due to the height difference between the inlet 10a and the storage tank 2, the flow will change depending on the opening of the flow path on the outflow lower C side of the automatic three-way flow control valve 7. By making the opening degree larger than that of the flow path on the outlet Ib side, it is possible to control the flow rate and pressure to a set value, and the injection pressure is controlled by the head due to pressure loss in the return pipe 8 and the height between the injection port 10a and the storage tank 2. If grout is injected by gravity at a flow rate that is lower than the phase of the lifting height due to the difference or the injection resistance of the ground is lower than the set flow rate, the opening degree of the flow path on the outflow lower b side of the automatic three-way flow regulating valve T The flow rate and pressure of the grout to be injected can be controlled to the set values by setting the flow rate to the flow path on the outlet IC side.

Next, an example of a three-way flow regulating valve suitable for the automatic three-way flow regulating valve in the above-mentioned grout injection control system will be explained with reference to FIG.

FIG. 2 shows a cross-sectional view of the three-way flow rate regulating valve, in which a sleeve 15 having an opening in the side wall is fitted and fixed in the valve case 14, and the opening 15a is connected to the inflow lower a provided in the valve case 14. is connected to. Also, inside the sleeve 15 is a valve rod 1 driven by a drive device (not shown).
A valve body 16 integrally attached to the tip of the valve body 7 is loosely inserted so as to be slidable or rotatable. The valve body 16 is attached by fitting the valve body 1T onto the tip of the valve stem 17, and screwing and tightening a nut onto the threaded portion of the tip of the valve body 17. Further, a sleeve retainer 18 is attached to one side of the valve case 14, and a backing case 19 is integrally attached to the other side by a coupling tool (not shown).
) - The foot presser foot 18 is provided with an outflow lower c.

Since the outlet IC has no liquid sealing part with the valve stem 17, it is normally connected to the flow path on the high pressure side, that is, the injection pipe 9, and is connected to the valve case 14.
The outflow lower b provided on the other side communicates with the backing case 19 and the liquid seal part of the valve stem 17, so it is often used as a low pressure side or passage to reduce the load on the liquid seal part. Return U is connected to No. 8.

20 is a valve chamber protection pipe fitted into the valve case 14 adjacent to the sleeve 15; 21 is a valve stem protection pipe fitted externally to the valve stem 17; and a washer 22 fitted externally to the valve stem 17. Although they are not essential to the functionality of the three-way flow control valve,
This is to prevent wear inside the valve due to a jet of grout containing cement, which is created by the gap between the opening 15a provided in the sleeve 15 and the valve body 16.
The three-way valve and volume control valve are made of ceramic with excellent wear resistance.

In addition, 23 is an O-ring provided between the valve case 14 and the sleeve retainer 18, and 24 is an O-ring provided between the valve case 14 and the sleeve holder 18.
25 is an O-ring provided between the valve case 14 and the backing case 19, 26 is a backing provided between the backing case 19 and the valve stem 1T, and the backing 26 is attached to the backing case 19 with bolts (not shown) and held by a backing presser 2T.

The three-way flow regulating valve described above constitutes an automatic three-way flow regulating valve by attaching a driving device to the backing case 19 using bolts or the like.

In the above-mentioned automatic three-way flow rate regulating valve, the valve body 16 slides or rotates within the sleeve 15 when driven by a driving device, but as shown in the second figure, the valve body 16 When the grout is on the upper side, the grout flowing in from the inlet T+J is divided into the outflow 07C side and the outflow lower [) side by the valve body 16 when passing through the opening 15a.
The flow rate of the grout flowing toward the outlet IC and 7b is determined by the area of the opening 15a divided by. Therefore, by arbitrarily adjusting the position of the valve body 16, the outflow lower c and 1
Any flow rate of b can be adjusted arbitrarily, and the flow rate of the first
Automatic three-way R in the grout injection control system shown in Nu1
It is extremely suitable as a quantity regulating valve.

This is because the valve body 16 is configured to slide or rotate and move within the sleeve 15.

There is a small gap between the valve body 16 and the sleeve 15, and grout naturally leaks from this gap, but the leakage [
11C is connected to the injection pipe 9, and the outflow lower b is connected to the return pipe 8, the outflow lower 0 is closed. (a) Since injection is not performed, it is sufficient to stop the pump 4.
Also, is the ejection percentage larger by the amount of light? Since a motsubonbun is used, there is no need to fully close the Mlt outlet lower b side, and leakage from the gap between the valve body 16 and the sleeve 15 is not a practical problem.
:) No.

In this invention (well, the valve body or the spur IJ-sp.
It can be made of ceramic such as alumina or cemented carbide such as tungsten carbide to make it wear resistant.

In three aspects of the present invention, since the quantity adjustment valve is constructed as described above, when used in the grout injection control system shown in Figure 1, it is possible to control the lift caused by the pressure in the return pipe and the height between the storage tank and the injection [1]. Even if the set injection pressure is lower than the sum of the head due to the difference, or if the injection resistance of the ground is low and grout exceeding the set flow rate attempts to flow in by gravity, the flow rate and pressure will be kept within the specified values. The grout can be injected while holding the grout, and the maintenance is easy and the grout can be pushed even further inwards.
11. The valve body is mainly composed of a valve body that moves to arbitrarily divert grout from the inlet.11. rokara, the structure is 41 fm
It is easy to maintain and the valve body is made of wear-resistant materials such as ceramics such as sleeved alumina and cemented carbide such as tungsten 7 carbide, and has excellent durability and is as durable as rubber valve seats. It does not need to be replaced frequently, and the structure of the valve body and sleeve can be manufactured easily and inexpensively, making it an extremely valuable contribution to this industry. An example of the fruitfulness of the invention is σ1, and the figure a↓ is a system diagram of an example of a grawat injection control system, and figure 182 is a cross-sectional view of an example of a three-way flow rate i-1P1.

γa...Inflow [1,7+),'IC...Outlet, 1
4... Bar I rev case, 15... Sub 11-bu, 15A
...Opening, 16 - Valve body patent applicant Representative director of Meisho Co., Ltd. Volume 8 Witness procedure amendment (spontaneous) 1981/θ Monthly To the Commissioner of the Japan Patent Office / Indication of case Patent application 1986 3g-7g9 : No. 222 Name of the invention Three-way flow rate adjustment valve for grout 3 Relationship with the case of the person making the amendment Patent applicant 5 Contents of the amendment Page // Lines 72 to 72 indicate "Outflow lower c 911i flow path σ piece... 6. Correct the statement ``thick (by doing so)'' to ``by appropriately adjusting the opening degree of the outlet side flow path.''

By making the 1 outflow lower b side flow path into a dog in the 1st outflow lower b side flow path from the wa sada/g line to the ko θ line, change the [outflow lower c
By appropriately adjusting the opening degree of the side flow path, it is corrected to ].

On page 10, line 73, the statement "valve body 17" is corrected to "valve body 16."

Page 10/Hiroyuki says 1-valve body 17.
Correct to "valve stem 17".

that's all

Claims (1)

[Claims] +11 A sleeve disposed within a valve case and having an opening in a side wall, and a sleeve that is inserted into the sleeve and moves by sliding or rotating, and the opening of the sleeve. 1-1 A valve body capable of adjusting the flow rate is provided in the valve case, communicating with the opening of the sleeve, and an inlet is provided in the valve case, and an outlet is provided on both sides of the sleeve. Three-way flow control valve for grout. (21) The three-way flow rate regulating valve for grout according to claim 1, wherein the valve body or the sleeve is made of a cemented carbide such as tungsten carbide.