JPH09132322A - Concrete force-feed adjusting pipe, concrete force-feed placing method, and concrete force-feed placing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure in-pipe resistance required to force-feed in a filled state over the whole length of a force-feed pipe without making aggregate in concrete go too far ahead by forming a concrete force-feed pipe of front and rear horizontal curved parts of a spiral part, and straight pipe parts at the tips of both horizontal curved parts. SOLUTION: A spiral part 1 is formed in a state of a pipe of specified length being wound once so that its boundary faces to front and rear horizontal curved parts 2, 2' are opposed parallelly, that is, in a state of being wound by 360 deg.. The horizontal curved parts 2, 2' with straight pipe parts 3, 3' formed continuously at the tips are curved in such a way that an angle formed by the boundary faces to the straight pipe parts 3, 3' and the boundary faces to a spiral part 1 is 45 deg., and the axes of the straight pipe parts 3, 3' form a straight line C. This constitution results in securing in-pipe resistance required to force-feed in a filled state over the whole length of a force-feed pipe without making the aggregate in concrete go too far ahead.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete adjusting pipe, a concrete press-casting method and a pressure welding apparatus using the adjusting pipe.

Generally, at a concrete pouring work site in a place where the topography is narrow such as a small-scale dam, the installation of the batcher plant is limited to a high place such as the top of the dam. Therefore, concrete pumping by concrete pump is
It goes to the horizontal portion, that is, the driving surface through the descending inclined portion. However, down slopes (especially steep slopes)
In the above, there is a possibility that the aggregate in the concrete may cause the phenomenon of preliminarily separating inside the pressure-feeding pipe, and the separated aggregate may accumulate at one place to block the pressure-feeding pipe.

[0003]

In order to avoid this, in addition to not installing the pressure feed pipe in the downward slope, the pressure feed pipe is made to meander in a horizontal plane or a vertical plane in the horizontal portion following the downward slope. Therefore, the entire length of the pumping pipe is always filled with concrete. However, even in this case, when the downward slope is long, it is necessary to perform a large-scale meandering of the pressure-feeding pipe in the horizontal part, which narrows the work area and is inconvenient. The amount of separated aggregate at that time increases. When the pumping pipe of the horizontal part that can be connected to the descending slope part is short because the horizontal part is narrow and the like, sufficient effect of preventing aggregate separation cannot be expected. There are problems such as.

The object of the present invention is not only to connect and install in the middle of the horizontal pressure feed pipe, but also to connect and install in the middle of the downward sloped pressure feed pipe, and because it is compact, Even when connecting and installing in the middle of the horizontal pumping pipe, the installation area is small enough, and even when the horizontal pumping pipe is short, the effect of preventing aggregate separation can be sufficiently exerted. By providing an adjusting pipe, it is possible to efficiently perform the desired concrete pressure pouring work without causing troubles such as clogged concrete in the pressure feed pipe, especially in a narrow site where the circumference is an inclined part. To be able to do it.

[0005]

A concrete pressure-feed adjusting pipe of the present invention is characterized by having a spiral portion 1. Before and after the spiral part 1, the horizontal curved parts 2,
2'and continuous straight pipe parts 3 and 3'at its tip, and the spiral part 1 makes the pipe of a required length parallel to the front and rear horizontal curved parts 2 and 2 '. As a concrete pressure-feeding adjusting pipe, it is necessary to form one winding so as to face each other, that is, to form a 360 ° wound state, and to mount and fix the adjusting pipe on a steel base b. It is effective to raise the effect of preventing the aggregate separation, and it is convenient to connect the connecting pipes in the middle of a series of pressure feeding pipes.

[0006]

Since the concrete pumping pipe of the present invention has the spiral portion, the concrete pumped by the concrete pump is fed by turning, so that the concrete does not cause the aggregate therein to precede.
It is possible to secure the required resistance in the pipe that is pumped while being filled over the entire length of the pumping pipe.

[0007]

1 to 5 show a concrete pressure-feed adjusting pipe a according to the present invention mounted and fixed on a pedestal b. In this embodiment, the adjusting pipe a is formed by the central spiral portion 1, the front and rear horizontal curved portions 2 and 2 ', and the straight pipe portions 3 and 3'at the tips of the horizontal curved portions 2 and 2'. ing.

The spiral portion 1 has a required length 1
The tube is formed in a state of being wound once, that is, in a state of being wound by 360 ° so that the boundary surfaces of the front and rear horizontal curved portions 2 and 2 ′ face each other in parallel. The horizontal curved portion 2, in which the straight pipe portions 3 and 3'are continuously formed at the tip.
2'is curved so that the angle between the boundary surface with the straight pipe portions 3 and 3'and the boundary surface with the spiral portion 1 is 45 °, and the center of the straight pipe portions 3 and 3'is further formed. The axes are designed to form a straight line c. Further, the winding diameter (height) of the spiral portion 1 is 1,110 mm, the straight length between the boundary portions a and a'between the spiral portion 1 and the horizontal bending portions 2 and 2'is 3,580 mm, and the horizontal bending is The straight length between the boundary portions B and B between the portions 2 and 2'and the straight pipe portions 3 and 3'is 810 mm, and the length of the straight pipe portions 3 and 3'is 350 mm. The straight length of is set to 5,900 mm.

The base b is made of steel and has left and right vertical rods 4, 4 '.
In addition, a steel central rod 5, front and rear inner rods 6, 6 '
In addition to straddling the front and rear outer horizontal rods 7 and 7 ', the left and right support columns 8 and 8'made of steel are provided at the central portions of the left and right vertical side rods 4 and 4', that is, at the positions where the central horizontal rod 5 is crossed. Stand up,
In addition, a support rod 9 is horizontally installed between upper left required positions slightly lower than the upper ends of the left and right support rods 8 and 8 '. The length of the left and right vertical rods 4, 4'of this frame b is set to 5,400 mm, which is shorter than the above straight line length of the adjusting tube a of 5,900 mm. The outer surface length (width) is set to 1,560 mm.

The adjusting tube a is mounted and fixed on the mount b as follows. The top of the spiral portion 1 rests on the central horizontal rod 5 between the left and right support rods 8 and 8'and straddles it, and the portion is tightened with a fixing band 10. , And the boundary portions a and a ′ between the spiral portion 1 and the horizontal curved portions 2 and 2 ′.
Is located above the front and rear inner lateral rods 6 and 6'in such a manner as to intersect with it, and the portions are tightened by the fixing bands 11 and 11 '. Furthermore, the horizontal curved portions 2, 2'and the straight pipe portions 3, 3 '
Boundary portions (b) and (b) 'are placed on the front and rear outer side rods 7, 7', and the portions are tightened with fixing bands 12, 12 ', and the straight pipe portions 3, 3'are connected to the front and rear outer side rods 7, 7. It is projected to the outside of 7 '.

Concrete pumped by a concrete pump enters from one straight pipe part 3 of the adjusting pipe a of the present invention through the upstream pump pipe and is sent out to the downstream pump pipe through the other straight pipe part 3 '. Then, the concrete is delivered by curving at 45 ° in the horizontal curving portion 2 and then 360 ° at the spiral portion 1, and further,
After being bent and fed by 45 ° in the horizontal bending portion 2 ', it is fed out from the straight pipe portion 3'. Therefore, it is possible to secure the required pipe internal resistance in which the concrete is pumped in a state of being filled over the entire length of the pumping pipe without causing the aggregate in the concrete to run ahead. The adjusting tube a of the present invention
Before reaching, that is, in the upstream pumping pipe, even if there is separation prior to the aggregate, the separated aggregate will be remixed into concrete in the spiral part 1. , You can maintain the quality of the concrete as set. This is important, especially for poorly mixed concrete, without degrading its quality.

Next, in order to confirm the effect of the adjusting pipe a of the present invention, a horizontal conversion length, that is, a length when a vertical pipe, a vent pipe or the like is converted into a horizontal straight pipe corresponding to an equivalent pipe pressure loss. From the "Concrete pump construction guideline (draft); Japan Society of Civil Engineers, November 1985", assume a nominal diameter of 250A and calculate based on the table below.

Item Unit Unit Nominal size Horizontal conversion length Upward vertical pipe 250 m 8 m per 1 m Vent pipe 90 ° 6 m per 1 pipe

As is apparent from the above description, in the adjusting pipe a of the present invention, the vent pipe is 360 ° in the spiral portion 1 and the horizontal curved portions 2 and 2 ′ are 90 ° in total of 450 °, and the upward vertical pipe is in the spiral portion 1. Winding diameter (height) of 1,110m
m, straight pipe is 700 mm of straight pipe part 3, 3 '. Therefore, the horizontal conversion length L = 1.1 x 8+ (450 ° / 90 °) x 6+
0.7 = 39.5 (m) This means that a resistance equivalent to 39.5 m of a horizontal straight pipe can be obtained by the adjusting pipe a of the present invention having a straight line length of 5.9 m between both ends.

If it is assumed that the pipe having a resistance equivalent to 39.5 m of the horizontal straight pipe is simply made to meander the pressure feed pipe in a horizontal plane as in the conventional case, a plurality of straight pipes 14 and a vent pipe 15 are required.
The pipe shape can be considered by appropriately combining, for example, as shown in FIGS. In the piping of FIG. 7, it is 7.5.
m × 4.5 m, and the piping of FIG. 8 requires an installation area of 12.0 m × 0.9 m. On the other hand, the adjusting tube a of the present invention
Even when this is mounted and fixed on the frame b, the installation area of the linear length of the adjustment tube 5.9 m × the width of the frame 1.56 m is sufficient, and it can be seen that the adjustment tube a of the present invention is compact.

FIG. 6 shows an embodiment in which the adjusting pipe a of the present invention is adopted in a concrete pumping apparatus installed at a work site of a small dam. That is, the concrete pumping device,
A batcher plant 17 is installed at the top 16 of the dam, and concrete produced by the batcher plant 17 is pumped into a horizontal part 20 of the dam via a downward slope 19 by a concrete pump 18. The adjustment pipe a of the present invention is connected between the upstream pressure feed pipe 21 and the downstream pressure feed pipe 22 of the downwardly inclined portion 19. Further, the pressure-feeding pipe 22 is connected to the pressure-feeding pipe 23 installed in the horizontal part 20 of the dam, and its discharge port is located at the concrete pouring portion.

Therefore, the concrete to be pumped by the concrete pump 18 is adjusted by the adjusting pipe a of the present invention between the upper and downstream pressure feeding pipes 21 and 22 in the downward slope portion 19.
Since it is spirally transported by the above, and the required resistance is imparted, it eventually fills the entire length of the pipe, and the aggregate is not separated in advance.

Even if the aggregate is preliminarily separated in the upstream pressure feeding pipe 21, that is, before reaching the adjusting pipe a, it is kneaded during the spiral transportation in the adjusting pipe a. Therefore, the quality of the poorly mixed concrete can be maintained as set without locally deteriorating the quality.

[0019]

As is clear from the above description,
Since the concrete pressure-feed adjusting pipe of the present invention has the spiral portion, the concrete pressure-fed by the concrete pump is fed by turning, and therefore the concrete does not cause the aggregate in the concrete to precede and the It is possible to secure the required resistance in the pipe that is pumped while being filled over the entire length.

The concrete pressure-feed adjusting pipe of the present invention may be used by connecting and installing it in the middle of the horizontal (or lower) pressure-feeding pipe, or by connecting and installing it in the middle of the down-tilt pressure-feeding pipe. It is clear that you can also. Moreover,
Due to its compactness, even when connecting pipes in the middle of the horizontal (or low) pumping pipe that is continuous with the downwardly inclined pumping pipe, the installation area is small and the horizontal part (low The effect of preventing aggregate separation in the pressure-feeding pipe in the descending inclined portion can be sufficiently exhibited even when the pressure-feeding pipe in the part) is short. Therefore, it is possible to contribute to the efficient execution of the desired concrete pressure pouring work without causing troubles such as clogging of the pressure pipe with concrete, especially in a narrow site where the periphery is an inclined portion.

[Brief description of the drawings]

FIG. 1 is a perspective view seen from the front side in a state in which a concrete pumping adjusting pipe according to the present invention is mounted and fixed on a frame.

FIG. 2 is a perspective view seen from the right side surface side of the above.

FIG. 3 is a plan view of the above.

FIG. 4 is a side view of the same.

FIG. 5 is a front view of the above.

FIG. 6 is an explanatory view of an example in which the adjusting pipe of the present invention is adopted in a concrete pressure-feeding device installed at a work site of a small-scale dam.

FIG. 7 is a plan view of an example of a piping state in which a pressure feed pipe is meandered in a horizontal plane.

FIG. 8 is a plan view of another example of the above.

[Explanation of symbols]

 a Concrete pumping adjustment pipe b Frame c Straight line 1 Spiral part 2, 2'Horizontal curved part 3, 3'Straight pipe part 4, 4'Left and right vertical rods 5 Central horizontal rod 6,6 'Front and rear inner rods 7, 7' Front and rear lateral rods 8,8 'Left and right support rods 9 Support rods 10 Fixed bands 11,11' Fixed bands 12,12 'Fixed bands 14 Straight pipes 15 Vent pipes 16 Dam tops (high places) 17 Batcher plants 18 Concrete pumps 19 Downward inclined part 20 Dam horizontal part (lower part) 21 Pressure feed pipe 22 Pressure feed pipe 23 Pressure feed pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuharu Meguro 2 Sanbancho, Chiyoda-ku, Tokyo Tobishima Construction Co., Ltd. (72) Inventor Masahiko Wakita 2 Sanbancho, Chiyoda-ku, Tokyo Tobishima Construction Co., Ltd. Within

Claims (6)

[Claims] 1. A concrete pressure-feed adjusting pipe having a spiral portion. 2. A spiral portion and horizontal curved portions before and after the spiral portion,
And a concrete pressure-feed adjusting pipe, which is formed by a straight pipe portion at each tip of both horizontal curved portions. 3. The spiral part is formed in a state in which a tube of a required length is wound once such that the boundary surfaces with the front and rear horizontal curved parts face each other in parallel, that is, in a state of being wound 360 °. The concrete pressure-feed adjusting pipe according to claim 2, wherein 4. The concrete pressure-feed adjusting pipe according to claim 1, wherein the concrete pressure-feed adjusting pipe is mounted and fixed on a pedestal. 5. Concrete is manufactured in a batcher plant installed at a high place such as the top of a dam, and the concrete is pumped by a concrete pump to a lower part such as a dam horizontal part via a pumping pipe of a pipe on a downward slope. In the concrete pressure-feeding construction method of placing concrete, concrete is spirally transported at the part of the concrete pressure-feed adjusting pipe having the spiral part connected between the upstream pressure-feeding pipe and the downstream pressure-feeding pipe of the downward slope. Concrete pouring and placing method characterized by pouring and pouring. 6. A batcher plant is installed at a high place such as the top of a dam, and concrete produced by the batcher plant is transferred to a low part such as a horizontal part of a dam through a concrete pump with a pumping pipe connected to a downward slope. In a concrete pressure-feeding device configured to be pressure-fed to a pipe part, a concrete pressure-feed adjusting pipe having a spiral portion is connected between the upstream pressure-feeding pipe and the downstream pressure-feeding pipe of a downward slope. A concrete pressure-feeding device.