JPS6059400B2 - Automatic lining mixing and placing equipment for early strength materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mixing and pouring device for automatic lining of early-strengthening material used in a construction method called the small-section Shield-E method.

The small-section shield method involves constructing underground tunnels with an inner diameter of approximately 1.2nL for laying communication cables, etc., but recently, flowable resin mortar is mixed and poured into cylindrical formwork. An automatic lining method using early-strengthening materials to construct tunnels is being considered. - In such an automatic lining method of early-strengthening materials, unsaturated polyester resin, sand, calcium carbonate, hardening accelerator, A mixing and pouring device 36 is installed in a formwork 35 that connects a material plant 33 to an excavation section 34 by applying resin mortar mixed with accelerators, polymerization inhibitors, etc., hardening liquid, and cleaning liquid for each pour. The material is transported by a transport vehicle 37, and is fed through the coupling device 38 to the mixing and pouring device one pouring portion at a time, and is poured into the formwork.

In this case, in the mixing and pouring device, it is necessary to stir and mix the resin mortar and hardening liquid mentioned above, pouring it into the formwork, and then cleaning the resin mortar hardening liquid mixture remaining in the mixing and pouring device. .

During this stirring and mixing, if the resin mortar hardening liquid mixture flows back into the hardening liquid and cleaning liquid piping and hardens near the outlet of the piping, it will cause trouble in the next pouring.

In addition, the inside of the mixing and pouring device must be made so that the residual resin mortar hardening liquid mixture can be easily cleaned during cleaning, that is, the peelability from the resin mortar hardening liquid mixture must be made good. , the next pouring will be hindered. Also, in the unlikely event that the product hardens in the mixing and pouring device, it is necessary to take into account the need for as few replacement parts as possible. The present invention has been made to solve the above-mentioned problems at the same time, and will be described below based on embodiments of the present invention.

Fig. 1 is a plan view of an embodiment of the mixing and pouring device of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a sectional view taken along line AA in Fig. 2, and Fig. 4 is a sectional view taken along line BB in Fig. 2. 5 is a sectional view taken along line CC in FIG. 2, FIG. 6 is a sectional view taken along line DD in FIG. 2, and FIG. 7 is a piping system diagram for the hardening liquid and cleaning liquid. The configuration, function, and operation of each part of the mixing and pouring device will be explained with reference to the drawings.

A pouring port 1 of the mixing and pouring device is installed so as to coincide with a pouring port of a formwork (not shown), and the mixed material is poured from the pouring port 1 in the direction of the arrow. Before pouring, the hydraulic cylinder 2 opens the pouring port shaft valve 3 that opens and closes the pouring port, the hydraulic cylinder 4 closes the drain ball valve 5, and the hydraulic cylinder 6 closes the feed port shaft valve. Close 7,
The screw 9 is rotated in the forward direction by the hydraulic motor 8.

Thereafter, among the resin mortar and hardening liquid sent from a material transport vehicle (not shown) through a coupling device (not shown), the hardening liquid is mixed with the hardening liquid and the cleaning liquid common piping 10 (the hardening liquid and cleaning liquid piping is installed only near the mixing machine). The liquid is ejected from the nozzle 11 into the housing 26 through the common At this time, the resin mortar is being fed through the mortar pipe 12 to the point where the feed port shaft valve 7 is closed. Next, when the feed port shaft valve 7 is opened by the hydraulic cylinder 6, the resin mortar flows into the housing 26 of the mixing and placing device, and as the screw 9 inside the housing rotates in the forward direction, the resin mortar and hardening liquid are stirred inside the housing. While being mixed, it advances toward the pouring port 1 and is poured into the formwork from the pouring port 1. When one casting is finished, the curing liquid is switched to the cleaning liquid without interruption, and at the same time, the feeding port shaft valve 7 is closed to stop feeding the resin mortar. Further, the casting port shaft valve 3 is closed, and the drain ball valve 5 is opened to wash away the resin mortar hardening liquid mixture remaining in the housing from the discharge port 13 with the cleaning liquid. At this time, the screw 9 continues to rotate in the forward direction. After that, the drain ball valve 5 is closed, the cleaning liquid is stored inside the housing, the screw 9 is switched from normal rotation to reverse rotation, and from reverse rotation to normal rotation, and the drain ball valve 5 is opened to drain the residual resin mortar hardening liquid mixture and cleaning liquid. It is discharged from the discharge port 13. This operation is repeated several times to wash away the resin mortar curing liquid mixture that remains on the inner wall of the housing or adheres to the screw surface. At this time, the cleaning liquid passes through the curing liquid and cleaning liquid common piping 10 and is ejected not only from the nozzle 11, but also through the cleaning liquid piping 16 and from the nozzle 17, or through the cleaning liquid piping 14 and from the nozzle 15, so that not only the inside of the housing is cleaned. The driving port shaft valve 3 and the feeding port shaft valve 7 can also be cleaned at the same time.

The drained liquid that has cleaned the casting port shaft valve 3 is drained from the drain port 18.
The drained liquid that has cleaned the feed port shaft valve 7 is discharged from the drain port 19, and these drained liquids are combined with the drained liquid from the discharge port 13.
They are processed together in one pipe. Next, since the apparatus of the present invention has a mechanism that prevents the resin mortar hardening liquid mixture from flowing back into the hardening liquid cleaning liquid common pipe 10, this will be explained.

This function is extremely important because if it were to harden in the backflow piping, subsequent mixing and pouring and cleaning would be impossible. FIG. 7 is a piping system diagram showing the hardening liquid 1 from the hardening liquid piping 20 to the filter 22, the check valve 24, and the hardening liquid cleaning liquid common piping 1.
0 and is ejected from the nozzle 11 into the housing.
On the other hand, the cleaning liquid (1) is branched into three branches from the cleaning liquid piping 21 through the filter 23, one of which passes through the check valve 25, enters the hardening liquid cleaning liquid common piping 10, and is ejected from the nozzle 11 into the housing. Another one of the three branches passes through the cleaning liquid piping 14 and is ejected from the nozzle 15 to the casting port shaft valve 3, and one of the remaining residues passes through the cleaning liquid piping 16 and is ejected from the nozzle 17 to the feed port shaft valve 7. It is squirted to

Of these piping systems, the check valves 24 and 25 only allow flow in one direction and prevent flow in the opposite direction, so the hardening liquid 1 is blocked by the check valve 25, so the cleaning liquid piping upstream from it is blocked. Also, since the cleaning liquid (1) is blocked by the check valve 24, it does not enter the hardening liquid piping located upstream of it.

Also, if you switch from the curing liquid to the cleaning liquid without any interruption, nozzle 1
Since the hardening liquid or the cleaning liquid is continuously spouted from the nozzle into the housing, it is also possible to prevent the resin mortar hardening liquid mixture in the housing from flowing back into the hardening liquid cleaning liquid piping through the nozzle. Even if the hardening liquid cleaning liquid is switched without any interruption, the flow rate changes slightly at the time of switching, so in order to improve the reliability of backflow prevention, it is desirable to make the length of the hardening liquid cleaning liquid common pipe 10 as short as possible. The backflow prevention mechanism described above does not require electricity such as a solenoid valve, and has the advantage that the mechanism is simpler and less likely to malfunction than when using a solenoid valve or the like. Next, in the apparatus of the present invention, the remaining resin mortar hardening liquid mixture is easily discharged from the casting apparatus, and when the resin mortar hardening liquid mixture is hardened in the housing, the hardened portion is removed. We have devised a way to make it possible to replace it, so I will explain it.

In order to completely discharge the residual resin mortar hardening liquid mixture, it is necessary to improve the peelability between the resin mortar hardening liquid mixture and the inner wall of the housing.

When we investigated such materials with high releasability, we found that polyethylene resin or polytetrafluoroethylene resin is preferable due to chemical and cost requirements. Therefore, the material of the casting port shaft valve 3, the feed port shaft valve 7, and the drainage Bonyl valve 5 is made of polyethylene resin or polytetrafluoroethylene resin, and the surface of the screw 9 and the inner surface 27 of the housing 26 are made of polyethylene resin or polytetrafluoroethylene resin. The inner cylinder 27 made of fluoroethylene resin and the inner surface of the housing made of polyethylene resin or polytetrafluoroethylene resin has a snap-in structure and is replaceable. In addition, in case it hardens inside the housing, the housing is structured so that it can be divided into two parts at the upper part of E.
The 6'' portion is removable, making it easy to clean the inside of the housing and replace parts. Reference numeral 28 is a bearing of the screw, 29 is a coupling with a hydraulic motor, and 30 is a pedestal.

Since the device of the present invention has the above-described configuration and functions, some of the piping for ejecting the hardening liquid cleaning liquid to the housing is shared, so that the hardening liquid or the cleaning liquid can be spouted continuously from one nozzle. This prevents the resin mortar hardening liquid mixture from flowing back into the pipe from the housing, and since a check valve is provided near the point where the hardening liquid or cleaning liquid joins from each individual pipe, the hardening liquid or cleaning liquid does not flow back into the pipe. Since the screw surface, the housing inner surface, the drain ball valve, the feed port shaft valve, and the casting port shaft valve are made of polyethylene resin or polytetrafluoroethylene resin, there is no possibility that the water will flow backwards into another upstream part of the piping. The resin mortar hardening liquid mixture is easily washed with a cleaning liquid and discharged. Such a device can also be applied to mixing and pouring cement mortar.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the mixing and pouring device of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a sectional view taken along line AA in Fig. 2, and Fig. 4 is a sectional view taken along line BB in Fig. 2. Cross-sectional view, Figure 5 is a CC cross-sectional view in Figure 2, Figure 6 is a D-D cross-sectional view in Figure 2, Figure 7 is a hardening liquid cleaning liquid piping system diagram, and Figure 8 is a small cross-section shield construction method. An explanatory diagram of automatic lining is shown. In the figure, 1 is the casting port, 3 is the casting port shaft valve, 5 is the drainage ball valve, 7 is the feed port shaft valve, 9 is the screw,
10 is a hardening liquid cleaning liquid common pipe, 11, 15, 17 are nozzles, 14, 16 are cleaning liquid pipes, 13 is a discharge port, 24, 2
5 is a check valve, 26 is a housing, and 27 is an inner cylinder made of polyethylene resin or polytetrafluoroethylene resin.

Claims (1)

[Claims] 1 A housing whose inner surface is made of polyethylene resin or polytetrafluoroethylene resin for stirring and mixing and casting resin mortar and hardening liquid, and a screw whose surface is made of polyethylene resin or polytetrafluoroethylene resin and can rotate forward and backward within the housing. Equipped with
The housing has a feed port shut valve made of polyethylene resin or polytetrafluoroethylene resin that opens and closes the resin mortar feed port, and a casting port shut valve made of polyethylene resin or polytetrafluoroethylene resin that opens and closes the casting port. and a drain ball valve made of polyethylene resin or polytetrafluoroethylene resin that opens and closes the drain outlet, and a hardening liquid cleaning liquid common piping for feeding the cleaning liquid for cleaning the inside of the housing and the above-mentioned hardening liquid into the housing. A backflow prevention valve is installed upstream of the common piping to prevent backflow to the hardening liquid piping or cleaning liquid piping.
Automatic lining mixing of early-strengthening materials, characterized in that a cleaning liquid jetting nozzle is provided near each valve so that the cleaning liquid can clean not only the housing but also the feeding port shaft valve and the casting port shaft valve. pouring equipment.