JPH0431407Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is designed to pipe fresh concrete discharged from a pump for pumping fresh concrete to a pouring site, and to pipe the fresh concrete to different places near the pouring site. This invention relates to a two-way branch pipe for branching and circulating in different directions.

Conventional technology Fresh concrete is essential for the execution of construction work, and during normal construction work, a feed path is formed with piping from the discharge port of the pump that pumps the fresh concrete to the construction site, and the ready-mixed concrete is continuously fed one after another. That's what I do. For example, in the case of tunnel construction using the Natom construction method, a formwork 2 for constructing the tunnel wall is erected in the excavated space 1 as shown in Figs. 4 and 5, and a fresh concrete pump (not shown) is Fresh concrete pumped from pipe 3 and pipe 3 branched from this pipe 3
A and 3b are used to cast the tunnel wall outside the formwork 2. The formwork 2 is supported in advance by a center so that it can withstand the weight of fresh concrete. During the above construction, it is required above all that the left and right tunnel walls be cast approximately evenly in order to prevent the formwork 2 from shifting in the left-right direction. Therefore, as shown in FIG. 6, a two-way branch pipe 5 having a substantially Y-shape is connected to the pipe 3 near the pouring work site.
After connecting the pipes 3a and 3b and distributing the fresh concrete in the left and right directions and pouring it at the same time to cast the walls 4a and 4b of a certain height, the ready-mixed concrete is poured from near the top of the formwork 2. to complete the pouring. If the balance between the left and right pouring amounts is lost during the pouring work of the wall portions 4a and 4b, the branching section is used to adjust the pouring amount of the branch path of the two-way branch pipe 5, which has a larger amount. A plate valve for blocking the flow of fresh concrete is provided nearby, so that the flow of fresh concrete toward pipe 3a or pipe 3b can be arbitrarily blocked.

Problems to be Solved by the Invention However, in the structure of such a conventional two-way branch pipe 5, one side of the pipe line of the two-way branch pipe 5 is simply shut off by a plate valve. As a result, there was a problem in that the pipe switching work could not be carried out smoothly due to clogging and solidification of the fresh concrete. For example, as shown in FIG. 7, when the plate valve 6 on the side of the pipe 3a branching from the pipe 3 is closed and only the plate valve 7 on the side of the pipe 3b is opened to allow fresh concrete to flow in the direction of the arrow A, the plate valve 6 is closed. A reservoir 8 of ready-mixed concrete is generated near the branch part on the side of the pipe 3a. In this storage section 8, there is no movement of the fresh concrete and the pressure of pumping the fresh concrete is constantly applied, so it tends to become stuck. Therefore, when the next time the plate valve 7 is closed and the plate valve 6 is opened to cause the fresh concrete in the pipe 3 to flow to the pipe 3a side, the storage portion 8 becomes solidified and the fresh concrete is mixed. Concrete cannot be pumped. Therefore, it is necessary to remove the solidified concrete from the storage section 8, which increases the complexity of the work.

Therefore, the present invention solves the problems of conventional two-way branch pipes for pumping fresh concrete, and eliminates the generation of fresh concrete pools in the branch pipes during work, and eliminates the need to change the flow path. The object is to provide a two-way branch pipe that can be implemented easily and in perfect condition.

Means for Solving the Problems In order to achieve the above-mentioned purpose, the present invention aims to provide a branch of a two-way branch pipe installed in the middle of a pipe that delivers fresh concrete discharged from a pump for pumping fresh concrete to a pouring site. A pair of slits for inserting the plate valve are formed in the part, and each slit has a curved surface that matches the shape of the inner wall of the pipe for feeding ready-mixed concrete, and a handle that allows this curved surface to be inserted into and removed from the inside and outside of each slit. By being equipped with a plate valve made of The structure maintains a continuous pipe line and allows the flow direction of fresh concrete to be switched.

Effect According to the present invention having the above configuration, when one of the plate valves is inserted through the pair of slits formed at the branch part of the two-way branch pipe using the handle,
This plate valve has a curved surface that matches the shape of the inner wall of the pipe that feeds the ready-mixed concrete.
The cross section of the feed path for fresh concrete does not change, and therefore no accumulation of fresh concrete due to clogging occurs. Therefore, switching of the branching route can be performed smoothly, the work of placing fresh concrete is not interrupted, and a work form is provided that eliminates complicated work.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. Note that the same parts as those in the conventional configuration will be described with the same reference numerals.

FIG. 1 is a perspective view of a two-way branch pipe according to the present invention, where 3 indicates a pipe connected to a discharge port of a pump for pumping fresh concrete (not shown), and 5 indicates a pipe 3.
It is a two-way branch pipe connected to the This two-way branch pipe 5 has a first branch passage 5a and a second branch passage 5 that branch and distribute fresh concrete in different directions.
b is formed, and a pair of plate valves 9a and 9b are further provided in the vicinity of the left and right sides of the branch portion 5c so as to be freely insertable and removable. As shown in FIG. 3, the plate valves 9a and 9b are formed with curved surfaces 10 that match the inner walls of the branch passages 5a and 5b, and have handles 11 fixed to them. On the other hand, slits 12a and 12b are formed in the vicinity of the branch portion 5c of the two-way branch pipe 5, into which the plate valves 9a and 9b can be freely inserted. The plate valves 9a and 9b can be inserted and removed in either direction.

The operation of the two-way branch pipe 5 having such a configuration will be explained below. That is, when the plate valve 9a is inserted into the branch part 5c using the handle 11 as shown in FIG. from the pipe 3 to the first branch passage 5a.
A conduit shown in the direction of arrow B is formed. This conduit has approximately the same diameter and length as the fresh concrete feed pipe 3, and has a continuous conduit shape in which the cross section of the feed path does not change. Therefore, the ready-mixed concrete fed in the direction of the branch path 5a through this pipe is completely prevented from being accumulated in the middle, and an extremely smooth flow condition can be obtained.

Next, when switching the pipe 3 to the second branch path 5b side of the two-way branch pipe 5, the plate valve 9a is returned to the outside, contrary to FIG.
By inserting it inward using the handle 11,
In the same manner as described above, a continuous pipe line is formed from the pipe 3 to the second branch line 5b without changing the cross section of the fresh concrete feed line. Therefore, it is possible to easily change the feeding direction of fresh concrete at the work site by switching on and off the plate valves 9a and 9b.

Effects of the invention As explained in detail above, a pair of slits for inserting a plate valve are formed at the branch part of the two-way branch pipe according to the invention, and each slit has a shape of the inner wall of the pipe for feeding ready-mixed concrete. Since the plate valve is equipped with a plate valve consisting of matching curved surfaces and a handle for inserting and removing the curved surfaces into and out of each slit, the following effects can be achieved. In other words, when switching the flow direction of fresh concrete to two directions on site, such as during tunnel construction using the Natom construction method, it is only necessary to insert and remove the plate valve using the handle through the slit formed in the two-way branch pipe. Therefore, the work can be carried out extremely smoothly. In addition, since the cross section of the feed channel does not change when the above-mentioned fresh concrete is flowing to one side of the branch channel, there is no concrete clogging or accumulation of concrete, and therefore the concrete inside the pipe does not get clogged or accumulate. Phenomena such as solidification can be completely eliminated. Furthermore, the switching operation of the branch road can be easily performed,
Since the operability is improved, the effect of improving work efficiency can be obtained, and it is useful for use in various types of fresh concrete pouring work.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the two-way branch pipe according to the present invention, FIG. FIG. 4 is a front view showing an example of tunnel construction using the Natom method, FIG. 5 is a side view, FIG. 6 is a plan view, and FIG. 7 is a schematic diagram showing an example of a conventional two-way branch pipe. 3...Pipe, 5...Two-way branch pipe, 5a...
First branch road, 5b... Second branch road, 5c...
Branching path, 9a, 9b...Plate valve, 11...Handle, 12a, 12b...Slit.

Claims (1)

[Scope of Claim for Utility Model Registration] A first and second pipe that is installed in the middle of a pipe that delivers fresh concrete discharged from a pump for pumping fresh concrete to a pouring site, and that branches and distributes the fresh concrete in different directions. In a two-way branch pipe in which a second branch path is formed, a pair of slits for inserting a plate valve are formed at the branch part of the two-way branch pipe, and the inner wall shape of the pipe for feeding ready-mixed concrete to each slit is formed. By being equipped with a plate valve consisting of a curved surface that coincides with the curved surface and a handle that inserts and removes this curved surface into and out of each slit, it is possible to connect the fresh concrete feed pipe and the first or second branch of the two-way branch pipe. Either side of the road
A two-way branch pipe for pumping fresh concrete, characterized in that it maintains a continuous pipe line that does not change the cross section of the fresh concrete feed path, and is capable of switching the flow direction of fresh concrete.