JPS6041200B2 - Backfilling material injection and mixing device for lining for shield construction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly uses a two-component mixture of early solidifying injection materials, such as backfill cement mortar, for the assembly of lining segments in tunnel excavation, underground pipe construction using the shield method, etc. Backfill injection mixing for shield construction lining body configured to rationally eliminate supply failure on the setting accelerator side and to perform mixing efficiently by utilizing the operation of the check valve mechanism installed in the It is related to the device.

As is well known, the shield method is often used for tunnel excavation work on soft ground, etc., and at the rear of the excavation work position, steel lining segments (hereinafter simply referred to as segments) are assembled to the required diameter. It is well known that the space between this segment and the ground after excavation is injected and filled with a backfilling material such as cement mortar and tied together. In this method, a cement mortar made by mixing fine aggregate such as clay sand and Boltland cement with water and a setting accelerator (mainly a sodium citrate solution) are mixed and injected immediately before injection. If the supply of hair filler is stopped when the injection work is completed, injection back pressure will act on the end of the injection pipe, causing the filler to flow back to the setting accelerator supply side in the mixing section, or to the cement mortar side. The coagulation accelerator may flow backwards, causing the material to coagulate beyond the mixing section of the injection tube, causing problems in the next injection operation.

Therefore, in this type of work, a check valve is attached to the setting accelerator side in the mixing section of the two liquids, and the check valve is pushed open by the force of the liquid to feed and mix the setting accelerator into the cement mortar. Although it is devised, it is injected several times,
As the stopping operation is repeated, the two liquids gradually react between the valve element and the valve seat, causing condensed solids to adhere to the space, and this accumulates and causes the valve to become damaged. This not only impairs the function of the valve seat, but also narrows the flow path around the valve seat, resulting in a decrease in the amount of coagulation accelerator flowing out.

However, since this phenomenon cannot be clearly seen from the outside, it will not be possible to secure the time required for the backfill material injected into the segment ring to solidify as planned.
In places where the ground is easily loosened, there is a risk of the ground collapsing, which is dangerous, so the manager of the backfill material injection work must frequently inspect the joints as described above. For this purpose, it is necessary to disassemble the mixer during the period when the injection operation is stopped, and in particular, to disassemble and clean the check valve portion on the coagulation accelerator supply side, which is very time-consuming and inconvenient. The present invention solves these problems, facilitates frequent disassembly inspections and cleaning of the injection inspector after injection work is completed, and makes it possible to set and maintain appropriate coagulation conditions during backfill injection, and to simplify post-processing. It is an object of the present invention to provide a rational backfilling material mixing and injection device which enables easy and reliable injection of backfilling material.

In the present invention, a plurality of check valves are disposed at appropriate intervals on the supply side of the condensation accelerator to the two-liquid mixing chamber up to the moat combining chamber, so that the flow of the liquid flowing The vibration effect on the liquid flow due to the chattering that occurs in each check valve, and the liquid is injected out by forming a narrow annular gap between the valve element and the valve seat of the check valve protruding into the mixing section. The present invention provides a mixing device which has a structure in which no condensation and clogging phenomenon occurs at all, and which promotes mixing and allows normal operation for a long period of time.

Hereinafter, one embodiment of the apparatus of the present invention will be specifically explained with reference to the drawings.

The one shown in Figure 1 is the most typical one, and 1 is the mixing device main body, 2 is the mixing chamber, which is directly connected to the cement mortar supply pipe 4 through the connection port 3, and 5 is the mixing chamber. 1 is a spouting body disposed on the setting accelerator supply side, and 7 is a connection piece between the spouting body 10 and the setting accelerator supply pipe 6 connecting body 20. , a through hole 7' and connecting screw portions 8, 8' are provided so that the ejecting body 10 and the connecting body 20 are orthogonally connected.

The jet body IQ has a cylindrical body 11 that is screwed perpendicularly toward the mixing chamber 2 of the body 1, and a stepped hole 2 inside which has a small diameter in the front half and a large diameter in the rear half. , the valve seat 14 at the tip of the bush 13 iron-installed in the small recess, and the conical surface 1 on the valve seat 14.
Valve 1 is closed and supported by the force of spring 18 with support from 5'.
5, and a winding interposed between the catch piece hook 9' and the rear end of the bush hook 3, which is inserted into the valve ring 16 of the valve head 15 and secured to the village end through the seat piece 19. It has a check valve V2 constituted by a valve closing means formed by a cylindrical body 18, the tip of which protrudes into the mixing chamber 2, and the head of the valve 15 is accommodated. A sleeping area 18f is provided around which a suitable annular gap is formed in the closed state.

Next, hinge the connecting piece 2 whose tip is the valve seat 24 to the opening □ part of the cylindrical connecting body with the stepped through hole 22 bored through the skin of the connecting body 2. A check valve V in which a spherical valve 26 is supported by a valve seat 24 via a winding spring 28 between the stepped portion and the stepped portion.
, is installed inside, and the sparrow also has socket 31 and nipple 3.
2 and the through hole of the connecting piece 7? ′ is connected perpendicularly to ′.

With this configuration, when carrying this product to a work site for work, a high-pressure hose is connected to the injection port of the segment by the connection part 5 of the main body by well-known means, and cement is connected to the connection port 3 of the segment. Connect the mortar supply pipe 4 and
The coagulation accelerator supply pipes 6 are connected, and opening/closing valves (not shown) are provided at appropriate locations on both supply pipes, and both liquids are fed into the main body 1 according to the signal to start the injection work. The required amount of setting accelerator is delivered to the cement mortar at a higher pressure than the mortar to the check valve V in the connection body 20.
, mechanism and the check valve V2 mechanism in the ejector chamber 0, and the setting accelerator is fed into the mixing chamber 2 through the check valve V2 mechanism in the ejector chamber 0. The valve 15 is pushed open against the force of the two stripes, passes through the through hole ``from inside the through hole 22, and reaches the stepped hole 12 of the magic body 10. Here, the valve 15 is pushed open against the force of the spring turtle 8. , injected into the mixing chamber 2 through a narrow annular gap formed by the valve seat bone 4 and the conical surface 15' of the valve vine 5;
By injecting the setting accelerator perpendicularly to the flow of cement mortar that is moving straight, it is violently stirred in the mixing chamber, and as a result, both liquids are rapidly mixed and sent to the injection pipe from the injection pipe connection part 5 to form a "segment". Injected into the void behind.

In this process, the setting accelerator is sent at a higher pressure than the cement mortar side, so the check valve V, easily opens due to the pressure difference between the two and allows the liquid to flow out, but that flow is first. After the first check valve V, the second check valve V2
Due to the frictional resistance with the passage passing through during the process, the spherical valve element 26 of the first check valve V is pushed open once, and then the compressive reaction force of the spring 25 and the valve element are Due to the so-called back pressure of the hydraulic pressure acting on the projected area facing the through hole 22 side, the valve 26 is momentarily closed, and then the valve holder 5 in the second check valve V2 is closed by the spring. When the pressure of the liquid between the two check valves V, V2 decreases due to the pressure of the liquid between the two check valves V and V2 decreasing as it is pushed open by hydraulic pressure against the force 18 and ejected into the cement mortar on the low pressure side. This valve side also exhibits a closed valve state, and when a pressure difference between the front and rear sides acting on the valve element 26 on the side of the first check valve V occurs, the valve element 26 is pushed open again. occurs repeatedly and frequently. In short, a chattering phenomenon occurs in both check valve mechanisms, and as a result, vibration occurs in the liquid flowing between the valve part of the connecting body 20 and the valve part of the ejecting body 10, and the liquid continues to have this vibration wave. The liquid is injected to the outside from the annular gap between the valve element 15 and the valve seat 14 of the ejection body 10. Since such vibration waves are generated during the feeding operation of the setting accelerator, they are ejected from the ejector into the mixing chamber at high speed with a pulsating flow, and therefore the outflow port of the ejector, that is, the valve. 15 and the valve seat 14, solid matter does not accumulate near the contact area between the valve seat 14 and the valve seat 15, and the mortar is allowed to flow even when the valve seat 15 is not in use. At the same time, it automatically opens as a check valve, preventing the coagulation accelerator from leaking out, and the next time it is used, it is immediately shut off to allow the required liquid to pass through, keeping the valve part clean at all times. The phenomenon of liquid leakage and condensation is less likely to occur, so there is no problem in long-term use.Therefore, regular disassembly and inspection is required, which simplifies handling and makes mixing operations easier, improving workability. It was possible to measure it.

The above description has been about a type in which the ejector is arranged orthogonally to the mixing chamber, but by using multiple check valves to generate vibrations during flow due to chattering, the ejector facing the mixing chamber is According to the gist of the present invention, the mixing effect can be enhanced by preventing the closing mechanism from being disturbed by condensation. According to the gist of the present invention, as illustrated in FIG. It is also possible to
In this type as well, the setting accelerator is caused to pulsate and jetted out by the same action as in the above embodiment, and it is jetted out parallel to the flow of mortar, so a baffle plate-like piece is provided in front of the jetting. This eliminates turbulent flow and enhances the mixing effect. This type of device will be explained as follows with reference to the drawings, and the same reference numerals are given to the same parts as in the previous embodiment. A cement mortar supply pipe 4 is connected to the rear end of the main body 40 via the connection port 3, and an injection pipe connecting member 5 is attached to the front part, and this main body 401 is connected orthogonally from the side to the inside. An introduction piece 41 having an introduction hole 42 is integrally provided so as to protrude, and a connecting body 20 similar to that of the previous embodiment is attached to the outer part of the main body 4 in parallel with a nipple 32 and a socket 31. It is connected to the through hole 42 in the introduction piece 41 through the connecting body 20, and inside the connecting body 20 there are a valve seat 24, a spherical valve element 26, and a coil spring 2 that constitute the check valve V.
5 are disposed inside the through hole 22. Then, from the tip of the introduction piece 41 inside the main body 40 toward the inside of the injection tube connection village 5, the ejection body 10, which has the same configuration as that of the previous embodiment, is inserted into the nipple 43, with its center aligned on the axis. It is connected to the through hole 42 of the introduction piece 41 through a protruding inner part, and the rear part of the inner stepped hole 12 of the cylindrical body 11 of the ejecting body 10 has one end in contact with the stepped part 12' and a surrounding part. A guide ring 45 of an appropriate length, which has a plurality of holes 45' bored in the mariline direction, is fitted with iron, and the valve element 15 having a conical surface 15' and the valve seat 14 are attached to the rear end of the bush 13. The closed state is maintained by a coiled spring 18 interposed between the receiving piece 46 and a spring receiving piece 17 attached to the rear end of the valve village 16 via a nut 19' and a seat piece 19. A small portion of the gap between the outer periphery of the spring receiving piece 1 and the inner periphery of the guide ring 45 is provided at the most hole 45' portion of the guide ring, in order to greatly expand the passage area. And check valve V2 with such a configuration
At the front side of the machine, a village 47 of an appropriate length whose base end is screwed and fixed to the head end of the valve element 15 is fixed with a baffle plate piece 48 with an appropriate amount of half-moon notches cut out on both sides at the tip, and a check valve is formed. The setting accelerator injected by opening the valve of the V2 mechanism collides with this to disturb the flow of cement mortar and facilitate mixing,
This part is designed to serve as a mixing chamber.
With such a configuration, when sending both supply liquids and injecting backfill, the setting accelerator is controlled by the check valves V, V2 installed inside the connecting body 20 and the ejecting body 10, respectively. A pulsating flow flows due to chattering with the same effect as explained in , and the setting accelerator injected in a pulsating manner from the tip of the ejecting body 10 is dispersed and injected into the cement mortar flowing from within the main body 40 to the injection connection pipe 5. Under the resistance of the baffle plate piece 48 at the tip, the two liquids are sufficiently mixed in the front portion thereof and are sent forward from the successful or defective portion to be injected. According to this method, the setting accelerator ejector is configured so that the liquid is ejected into the flow tube of the cement mortar at about the same rate, the overall structure is made high and low, and the flow velocity in the mixing section is increased. This facilitates the formation of a turbulent flow state and allows for rapid mixing, making handling at the site of use convenient. According to the gist of the present invention, the setting accelerator supplied to the flowing part of cement mortar is passed through a flow path in which a plurality of check valves are arranged in series, and is then pulsated and sprayed at the tip of the flow path. At the opening/closing part of the valve that mixes and comes into direct contact with the mortar, a pulsating flow is created in the setting accelerator during the pouring process to prevent solid matter from adhering to the setting reaction.
In addition to providing the check valve V in the connecting body in each of the above embodiments close to the main body, it is also possible to provide two check valves in series even if the check valve V is provided in the conduit at a position slightly further away than this. The desired purpose can be achieved because chattering occurs due to pressure fluctuations between both check valves.Furthermore, even if two or more check valves are arranged in series, chattering occurs due to deviations between the two check valves. This causes a pulsation phenomenon and prevents condensate from adhering to the check valve seat at the tip of the grain, resulting in good results. In addition to connecting the check valve to the main body as described above, the purpose of the check valve can be achieved by arranging it in series at an appropriate interval in the setting accelerator supply pipeline, and it has a simple structure that is different from the conventional one. This problem could easily be solved.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part of an embodiment of the apparatus of the present invention, FIG. 2 is a vertical cross-sectional view of another example, and FIG. 3 is an enlarged cross-sectional view taken along line mm of FIG. 1,40... Main body, 2... Mixing chamber, 3...
Connection port, 4... Cement mortar feeder pipe, 5...
Injection pipe connection part, 6... Setting accelerator supply v supply pipe, 7
...Continuous piece, 10...Ejected body, 11...
・Cylindrical body, 12...stepped hole, 14...valve seat,
15... Valve, 15'... Conical surface, 1
6... Valve punch, 17... Spring receiver piece, 18...
...Coil spring, 20...Connection body, 21...
... Thoracic connection body, 22... Through hole, 24...
・Valve seat, 25...Coil spring, 26...Valve element, 41...Introduction piece, V,, V2...
・Check valve mechanism. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In a device that mixes an appropriate amount of a setting accelerator for early setting into a backfill injection material such as cement mortar, the conical surface of the valve is attached to the mixing part of the cement mortar feed pipe so that the injection is carried out in an annular manner. The valve portion of the check valve is configured to abut against the valve seat, and at least one check valve is provided at appropriate intervals in the setting accelerator supply pipeline connected to the check valve. Features: Backfill injection material mixing device for lining for shield construction.