JP3872739B2 - Concrete placement method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concrete placement method for placing concrete in a placement plan area extending in a vertical direction.
[0002]
[Prior art]
At the construction site such as a power plant, concrete can be placed in a vertical placement area such as the inner wall of a vertical shaft, using concrete bucket / chute placement, snake chute placement, or a concrete dropping device. Conventionally, driving, concrete pump car high-pressure driving (blowing), and the like are common. Which of these methods is to be performed is appropriately determined according to the depth of the shaft and the amount of concrete to be placed.
[0003]
In addition, the concrete placement system of patent document 1 is proposed as a technique of conveying and placing concrete in the arbitrary points of a construction site.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-269852
[Problems to be solved by the invention]
However, when a large amount of concrete is placed, according to the concrete bucket / chute placement, it takes a long time to raise and lower the concrete bucket, so the construction efficiency deteriorates. According to the snake shot placement, there is concern about the durability of the snake shot.
[0006]
In addition, in the placement by the concrete dropping device, since the placement is performed with the concrete dropping device suspended by a crane, the work is performed while ensuring the safety of the worker, and the construction efficiency may be deteriorated. . Furthermore, in the high-pressure placement of a concrete pump car, since it is placed from below, there are many cases where it cannot be carried out due to the location of the construction site.
[0007]
Accordingly, the present invention has been made in view of such circumstances, and is suitable for placing a large amount of concrete in a large-scale placement area where the height difference exceeds 100 m. The purpose is to provide an installation method.
[0008]
[Means for Solving the Problems]
To achieve the above object, concrete設方method according to the present invention is a concrete設方method for pouring the concrete pouring scheduled region extending in the vertical direction, along the pouring region where the A transportation route forming step for forming a plurality of concrete transportation routes in the planned placement area, a first branching route forming step for forming a first branching route at a first position in the transportation route, and a transportation route upward A first placement step of placing the concrete transported from the first planned route into the planned placement region, and a second position above the first position in the transportation route after the first placement step. A second branch path forming step of forming a second branch path at the position of the second, and a second placement of placing the concrete transported from the upper side of the transport path into the placement planned area through the second branch path And a process.
[0009]
According to this concrete placement method, after placing concrete through the first branch path in the planned placement area extending in the vertical direction, through the second branch path above the first branch path. In order to place concrete, it is possible to place concrete sequentially from the lower region in the planned placement region. Therefore, even when the placement area is large, for example, having a height difference exceeding 100 m, and it is necessary to place a large amount of concrete, the concrete can be reliably and completely covered over the entire area of the placement area. It can be placed efficiently and construction efficiency can be improved. Further, since it is possible to continuously cast a large amount of concrete through each branch path, it is possible to prevent separation of the placed concrete.
[0010]
In the concrete placing method according to the present invention, the transportation path is formed by connecting a plurality of pipe bodies, and the first branch path forming step is a pipe body arranged at the first position among the pipe bodies. Is replaced with the first branch pipe-attached tube body in which the branch pipe is formed, and the second branch path forming step replaces the pipe body arranged at the second position in the pipe body with the branch pipe. It is preferable that it is the process of replacing | exchanging with the 2nd pipe | tube body with a branch pipe formed. In this way, if a transportation path is formed by connecting a plurality of pipes, it is possible to deal widely with various placement areas. Moreover, the 1st and 2nd branch path mentioned above can be easily formed by replacing | exchanging the pipe body arrange | positioned in the 1st and 2nd position to a pipe body with a branch pipe.
[0011]
In the concrete placing method according to the present invention, the transport path is a distance between the pipe connected to the upper end of the pipe arranged at the first position and the pipe connected to the lower end of the pipe. A first holding means for holding the second and a second pipe for holding a distance between the pipe connected to the upper end of the pipe arranged at the second position and the pipe connected to the lower end of the pipe. It is preferable to have the holding means. A tube connected to the upper end of the tube disposed at the first position even when a load due to the weight or the like of the tube connected to the upper side is applied to the tube disposed at the first position And the tube connected to the lower end are reliably held by the first holding means (the same applies to the tube arranged at the second position). Therefore, in the 1st and 2nd position, attachment / detachment with respect to the transport path of each pipe body and each pipe body with a branch pipe can be performed safely and easily.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a concrete placing method according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.
[0013]
FIG. 1 is a side view showing a construction site of a hydroelectric power plant. In the figure, in order to construct a hydraulic iron pipe unit in which a plurality of hydraulic iron pipes 2 are connected in the shaft 1, a gap (planned placement area) S between the inner wall surface of the shaft 1 and each hydraulic iron pipe 2 is formed. It is necessary to pack concrete. For this purpose, concrete is placed in the gap S as follows.
[0014]
First, the concrete transport path 4 is formed along the inner wall surface of the shaft 1. The upper end of the transport path 4 is connected to a receiving hopper 5 via a predetermined pipe, and concrete is pumped to the receiving hopper 5 from an upper concrete pump truck 6 via a transport path 7. Thereby, in the transport path 4, concrete is pumped from the upper part to the lower part. The transport path 7 has a bent portion 7 a bent upward in the vicinity of the lower end portion, and a hydraulic shutter valve 7 b is installed between the bent portion 7 a and the receiving hopper 5. By providing such a bent portion 7a, the impact at the time of placing the concrete is reduced, and furthermore, the concrete always remains in the pipe even when the placing is interrupted. Concrete is pumped. Further, since the shutter valve 7b opens and closes in conjunction with the start and stop of the pumping of the concrete pump vehicle 6, it is possible to prevent the concrete from being suddenly sent through the pipe and being in a vacuum state when the pumping is stopped.
[0015]
The transporting path 4 connects a number of pumping pipe units 8 and a driving pumping pipe unit 9 (arranged at a first position in the transporting path 4 and a second position above the transporting path 4). Is fixed to the inner wall surface of the shaft 1. Thus, by fixing the transport path 4 to the inner wall surface of the shaft 1, safe and reliable placement of concrete can be performed. The first and second positions are set in advance as positions for placing concrete. However, depending on the scale of the shaft 1, the positions of the third, fourth,... The installation pressure feeding pipe unit 9 may be interposed.
[0016]
As shown in FIG. 2, the pressure feeding pipe unit 8 is configured by arranging two pressure feeding pipes (tube bodies) 10 made of steel pipes in parallel (since FIG. 2 is a side view, one pressure feeding pipe 10 is provided. It is fixed to the inner wall surface of the shaft 1 by the chemical anchor 11. A high pressure collar 12 for connecting to other pressure feeding pipes is attached to both ends of each pressure feeding pipe 10, and a trap 13 for performing various operations is provided on one side of the pressure feeding pipe 10. It has been.
[0017]
Further, as shown in FIG. 3, the driving pressure feeding pipe unit 9 has a rectangular holding frame 14 formed of a steel material, and is fixed to the inner wall surface of the shaft 1 by a chemical anchor 11. In the holding frame 14, two pressure feed pipes (tube bodies) 15a made of steel pipes are fixed in parallel to the upper frame portion 14a, and two pressure feed pipes (tube bodies) made of steel pipes are fixed to the lower frame portion 14b. 15b is fixed in parallel. A collar 12 is attached to both ends of each of the pressure feeding pipes 15 a and 15 b, and a trap 13 is provided on one side of the holding frame 14.
[0018]
Further, a replacement pressure feeding pipe 16 made of a steel pipe is disposed between the pressure feeding pipe 15a and the pressure feeding pipe 15b, and is connected to the pressure feeding pipes 15a and 15b via the collars 12 at both ends thereof. In addition, a pressure-feed pipe 18 with a branch pipe made of a steel pipe can be connected between the pressure-feed pipe 15 a and the pressure-feed pipe 15 b instead of the replacement pressure-feed pipe 16. As shown in FIG. 4, the branch pipe-attached pressure feed pipe 18 includes a main pipe 18 a connected to the respective pressure feed pipes 15 a and 15 b via the collar 12, and a branch pipe 18 b that branches obliquely downward from the main pipe 18 a. It is comprised.
[0019]
After the transport path 4 is formed in the shaft 1 by the pressure feed pipe unit 8 and the placement pressure feed pipe unit 9 as described above, as shown in FIG. 5, the pressure feed pipe for placement disposed at the first position. A predetermined number of hydraulic iron pipes 2 are built up near the lower end of the unit 9. Subsequently, as shown in FIG. 6, the upper end opening of the uppermost hydraulic iron pipe 2 is covered with a canopy 21, and a working scaffold 22 is installed on the canopy 21. Then, one replacement pressure feed pipe (tube body arranged at the first position) 16 of the placement pressure feed pipe unit 9 is removed, and the pressure feed pipe with the branch pipe suspended by the crane (the pipe with the first branch pipe). Body) 18 is connected.
[0020]
In the pressure-feeding pipe unit 9 for placement, even if a load due to the weight of the pressure-feeding pipe unit 8 connected to the upper side is applied, the distance between the pressure-feeding pipes 15a and 15b is the holding frame (first holding means) 14. Is held securely. Therefore, when exchanging the replacement pressure feeding pipe 16 and the branch pipe-attached pressure feeding pipe 18, the pressure feeding pipes 16 and 18 can be safely and easily attached and detached.
[0021]
Subsequently, as shown in FIG. 7, a concrete chute 23 is connected to the tip of the branch pipe (first branch path) 18b of the branch pipe-attached pressure feed pipe 18. Then, concrete is put into the receiving hopper 5 from the concrete pump vehicle 6 through a predetermined transportation path, and the concrete is pumped from the upper side to the lower side with respect to the transportation path 4. In addition, it is good also as a structure which pumps concrete directly from the concrete pump vehicle 6 to the transport path 4 without using the receiving hopper 5.
[0022]
When the concrete pumping to the transport path 4 is started, the concrete is supplied to the gap S between the inner wall surface of the shaft 1 and the hydraulic iron pipe 2 through the branch pipe 18 b and the concrete chute 23. Then, concrete is placed around the hydraulic iron pipe 2 while rotating the branch pipe 18b and the concrete chute 23. After pouring concrete up to the vicinity of the upper end of the uppermost hydraulic iron pipe 2, a small amount of water is poured from the upper part to clean the transportation path 4 above the first position. Then, the branch pipe-attached pressure feed pipe 18 is removed and cleaned, and the replacement pressure feed pipe 16 previously removed is connected.
[0023]
Next, a predetermined number of stages of the hydraulic iron pipes 2 are built up to the vicinity of the lower end of the placement pressure feeding pipe unit 9 arranged at the second position, and one replacement pressure feeding pipe of the placement pressure feeding pipe unit 9 (second 16) is removed, and a pressure-feed pipe with a branch pipe (second pipe with a branch pipe) 18 is connected. Also in this pressure feeding pipe unit 9 for placement, since the distance between the pressure feeding pipes 15a and 15b is securely held by the holding frame (second holding means) 14, the pressure feeding pipes 16 and 18 can be attached and detached safely and easily. Can be done.
[0024]
Subsequently, the concrete chute 23 is connected to the tip of the branch pipe 18 b of the pressure feed pipe 18 with the branch pipe, and then the concrete is pumped from the upper side to the lower side with respect to the transport path 4. Thereafter, concrete is placed in the gap S between the inner wall surface of the shaft 1 and the hydraulic iron pipe 2 through the branch pipe (second branch path) 18b and the concrete chute 23 in the same manner as the first position described above.
[0025]
Further, when the casting pressure feeding pipe unit 9 is interposed at the third, fourth,... Positions, similarly, the predetermined number of stages of the hydraulic iron pipes 2 are installed at the third, fourth,. Then, the replacement pressure feeding pipe 16 is replaced with a pressure feeding pipe 18 with a branch pipe, and concrete is placed through the branch pipe 18b of the pressure feeding pipe 18 with the branch pipe.
[0026]
According to the concrete placement method described above, concrete is placed in the first position with respect to the gap S between the inner wall surface of the shaft 1 and the hydraulic iron pipe 2, and then the first position above the first position. Since the concrete is placed at the position 2, the concrete can be placed sequentially from the lower region in the gap S. Therefore, even when the shaft 1 is a large scale having a depth exceeding 100 m and a large amount of concrete needs to be placed in the gap S, the concrete is surely and efficiently applied over the entire range of the gap S. It is possible to improve the construction efficiency. Further, since it is possible to continuously cast a large amount of concrete at each position, it is possible to prevent separation of the placed concrete.
[0027]
In addition, since the transport path 4 is formed by the pressure feeding pipe unit 8 and the placement pressure feeding pipe unit 9, it is possible to deal with a wide range of shafts 1 of various scales. And the rigidity of the transport path 4 becomes very high by unitization, and high safety is ensured against the load (impact) accompanying the pumping of concrete. Further, by replacing the replacement pressure feed pipe 16 with the branch pipe pressure feed pipe 18 in the placement pressure feed pipe unit 9 arranged at the first and second positions, the branch path branched from the transport path 4 is changed to each position. Can be easily formed.
[0028]
Furthermore, since the transportation path 4 has two lines of piping composed of the pressure feeding pipes 10, 15a, 15b and the replacement pressure feeding pipe 16, only one line of piping is used for concrete pressure feeding as described above. Other series of piping can be used as drainage piping. Then, by using the two series of pipes for the concrete pumping while sequentially switching, the wear of the pipes of each series accompanying the large-scale placement of concrete can be suppressed, and the life of the transportation path 4 can be extended.
[0029]
In addition, this invention is not limited to the said embodiment. For example, the transportation route according to the present invention is not limited to having two lines of piping, but may have one line of piping, or may have three or more lines of piping. Moreover, in the said embodiment, although the transportation path 4 was directly formed in the gap | interval S which is a placement plan area | region, if the transportation path which concerns on this invention is formed along a placement plan area | region, it will be a plan placement area | region. It may be formed outside.
[0030]
In the above embodiment, the branch path is formed by replacing the replacement pressure feed pipe 16 with the pressure feed pipe 18 with the branch pipe. For example, the branch pipe is directly connected to the pressure feed pipe forming the transport path. A path can also be formed. Furthermore, the present invention is not limited to the construction of a structure in a shaft such as a hydraulic iron pipe, but can be applied to construction of a structure having a height difference in the vertical direction.
[0031]
【The invention's effect】
The concrete placement method according to the present invention can be suitably implemented when a large amount of concrete is placed in a large placement area where the height difference exceeds 100 m.
[Brief description of the drawings]
FIG. 1 is a side view showing a construction site of a hydroelectric power plant in which an embodiment of a concrete placing method according to the present invention is implemented.
FIG. 2 is a side view of a pressure feeding pipe unit that forms the transportation path shown in FIG. 1;
FIG. 3 is a front view of a pressure feeding pipe unit for placing that forms the transportation path shown in FIG. 1;
4 is a front view showing a pressure-feed pipe with a branch pipe attached to the pressure-feed pipe unit for placement shown in FIG. 3. FIG.
FIG. 5 is a conceptual diagram showing how a hydraulic iron pipe is built in the shaft shown in FIG. 1;
6 is a conceptual diagram showing a state of replacement between a replacement pressure feed pipe and a branch pipe-attached pressure feed pipe in the shaft shown in FIG. 1. FIG.
7 is a conceptual diagram showing a state of placing concrete in the shaft shown in FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Vertical shaft, 2 ... Hydraulic iron pipe, 4 ... Transport route, 10, 15a, 15b ... Pressure feed pipe (pipe body), 14 ... Holding frame (1st holding means, 2nd holding means), 16 ... Pumping for replacement | exchange Pipes (tubes arranged at the first position, pipes arranged at the second position), 18 ... pressure feed pipe with branch pipe (first pipe with pipe, second pipe with pipe) ), 18b ... branch pipe, S ... gap.

Claims (3)

A concrete placement method for placing concrete in a planned placement area extending in a vertical direction,
A transportation route forming step for forming a plurality of concrete transportation routes in the placement planned region along the planned placement region ;
A first branch path forming step of forming a first branch path at a first position in the transport path;
A first placing step of placing the concrete that has been transported from above the transportation path into the placement planned area through the first branch path;
After the first placing step, a second branch path forming step for forming a second branch path at a second position above the first position in the transport path;
A concrete placing method, comprising: a second placing step of placing the concrete transported from above on the transportation path into the placement planned area through the second branch path. The transport path is formed by connecting a plurality of pipes,
The first branch path forming step is a step of replacing the pipe body arranged at the first position in the pipe body with a first branch pipe-attached pipe body in which a branch pipe is formed,
The second branch path forming step is a step of replacing the pipe body arranged at the second position in the pipe body with a second pipe with a branch pipe in which a branch pipe is formed. The concrete placement method according to claim 1, wherein the concrete is placed. The transport route is
A first holding means for holding a distance between a pipe connected to the upper end of the pipe arranged at the first position and a pipe connected to the lower end of the pipe;
A second holding means for holding a distance between the pipe connected to the upper end of the pipe arranged at the second position and the pipe connected to the lower end of the pipe. The concrete placing method according to claim 2, wherein the concrete is placed.

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