JP3220694B2 - Concrete casting method in construction of SRC underground continuous wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete placing method which is carried out when constructing an SRC underground continuous wall.

[0002]

2. Description of the Related Art SRC underground continuous wall 10 shown in FIG.
Is a configuration in which a steel frame 11 (H-section steel or the like) is used together with a reinforcing bar 12. The SRC underground continuous wall 10 is provided with a deep groove 15 for wall construction underground while stabilizing the hole wall using a stabilizing solution.
Is excavated, a combination of the steel frame 11 and the reinforcing bar 12 is inserted into the deep groove 15, and concrete is poured into the deep groove 15 to construct a foundation, or a retaining wall for constructing an underground structure or the like. Used for The SRC underground continuous wall 10 is
The wall thickness can be reduced by an amount corresponding to the use of the steel frame 11 together with 2.
Therefore, great expectations have been placed on the realization of the recent concept of deep underground utilization. On the other hand, since the steel frame 11 vertically partitions the inside of the deep groove 15, in order to cast dense concrete with high quality, one tremy tube 13 is provided between each steel frame (H-section steel) 11. There is a demand that concrete be poured at a time, at a time, in units of one construction unit, so that no concrete breakage occurs. Further, in order to equalize the amount of concrete to be poured, usually, one fresh concrete mixer truck is attached to each tremy tube to supply concrete and perform concrete placing. Usually, three or more tremy tubes 13 are simultaneously used to construct a wall of one construction unit.

[0003]

In the case of the conventional concrete pouring method, in principle, the concrete pouring operation is carried out until all the ready-mixed concrete mixer trucks having the same number as the number of tremy tubes 13 arrive and the concrete can be supplied. Can't start. In addition, it is necessary to secure a space where a plurality of arrived ready-mix concrete trucks can approach at once, which is almost impossible in practice.

[0004] As a result of the above problems, the waiting time of the ready-mixed concrete mixer truck is increased, so that not only the time for concrete placing work is prolonged, but also the quality of the concrete is adversely affected by the splicing of concrete. . Further, when the space for leaning of the ready-mixed concrete mixer truck cannot be ensured, there is a problem that the number of tremie pipes 13 to be installed is restricted, which is a problem to be solved.

[0005] Accordingly, an object of the present invention is to provide a concrete concrete mixer for constructing an SRC continuous underground wall which can successively place concrete by arriving ready-mixed concrete mixers by supplying concrete one by one, and which does not require a particularly large leaning space. It is to provide a casting method.

[0006]

Means for Solving the Problems As a means for solving the above-mentioned problems, a concrete casting method in the construction of an SRC underground continuous wall according to the present invention comprises: The hopper body is long enough to receive and store ready-mixed concrete.
At the same time as the concrete outlet in the hopper body
Plurality set <br/> only isosamples spaced a striking設口with adjustable plate laterally, the hopper the raw concrete mixer truck, etc.
Supplying ready- mixed concrete to the body , one construction unit of S
One tremy tube is provided for each part of the RC basement continuous wall partitioned by a steel frame, and each tremy tube is individually connected to each of the above-mentioned casting holes and one by one casting chute. a work of pouring evenly and to simultaneously raw concrete to SRC diaphragm wall construction position of the punching設量adjustment plate operation to one construction unit and supplying ready-mixed concrete to the tremie tube punching設口,
In accordance with the progress of concrete casting,
To stop the concrete flow and escape the casting chute
To remove the tremy tube
Each feature.

[0007]

The ready-mixed concrete is supplied to the hopper body 2 of the casting hopper 1 one by one by a concrete mixer truck 14 and stored therein, and the casting amount 3 is adjusted uniformly by the casting amount adjusting plate 4. Are simultaneously supplied to one tremy tube 13 connected to each casting port 3. Tremy tube 1
The ready-mixed concrete supplied from 3 is uniformly and simultaneously poured into the construction position of the SRC underground continuous wall 10 within the range of the construction unit.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIGS. 1A and 1B show how concrete is poured in the construction of an SRC underground continuous wall 10 using the casting hopper 1 shown in FIGS. The casting hopper 1 shown in FIGS. 2 and 3 includes a hopper main body 2 and a casting port 3.
The hopper body 2 has a rectangular shape that is long enough in the horizontal direction to receive the ready-mixed concrete from the concrete mixer truck 14, and has a wide-mouth receptacle 2a and an inclined bottom portion 2b that stores the ready-mixed concrete and guides it to the outlet (FIG. 2B). reference). The length in the horizontal direction is, for example, three (3) connected to three tremy pipes 13 arranged at a pitch corresponding to an interval between three steel frames (H-shaped steel) 11 constituting a wall of one construction unit ( Multiple)
Are horizontally long so that the casting holes 3 can be arranged at considerable intervals (see FIG. 2A). In the present embodiment, three cylindrical setting holes 3 are provided at the outlet portion of the hopper body 2, and a setting amount adjusting plate 4 is provided at an intermediate position (see FIGS. 2A and 3). The opening of the casting mouth 3 is connected to the tremy tube 13 through a half-split tubular casting chute 5 to mix the ready-mixed concrete into the tremy tube 1.
3 (see FIG. 2B). The driving amount adjusting plate 4 is
By moving it up and down, the opening area of the casting port 3 is changed, and the amount of ready-mixed concrete supplied from each casting port 3 is adjusted. Not only that, it is also used as a gate valve for stopping the flow of ready-mixed concrete when the tremy tube 13 is disconnected and reconnected (see FIG. 3). In addition, the above-mentioned casting chute 5 is 2
It is of a step-fold type and can swing in the left-right direction, so that the tremy tube 13 can be easily disconnected and reconnected.

Next, the SR using the above-described casting hopper 1 is used.
The method of placing concrete in the C underground continuous wall 10 will be described with reference to FIG. The procedure of the method of constructing the SRC underground continuous wall 10 is as follows. First, a reinforcing bar 12 and a steel frame (H-shaped steel) 11 are reinforced as reinforcing materials in a deep groove 15 of one construction unit excavated while protecting the hole wall with a stabilizing liquid. A braid is built. Then, one tremy tube 13 is installed in each of the substantially intermediate portions between each H-shaped steel 11. The upper end of each tremy tube 13 is individually connected to the setting port 3 of the setting hopper 1 and the setting chute 5. The ready-mixed concrete mixer truck 14 arriving at the site does not need to wait in particular,
The ready-mixed concrete is immediately supplied to the hopper body 2. The supplied ready-mixed concrete is temporarily stored in the hopper main body 2, and is uniformly and simultaneously supplied to each tremy pipe 13 from each of the casting holes 3. The supply amount of the ready-mixed concrete is adjusted by the placement amount adjusting plate 4, and the ready-mixed concrete is simultaneously poured into the deep groove 15 at the construction position of the underground continuous wall through the tremy pipes 13 corresponding to the respective placement ports 3. . In accordance with the progress of the concrete placing, the tremy tube 13 is gradually pulled up, and the SRC underground continuous wall 10 is constructed. At the time of pulling up the tremee pipe 13, the concrete in the casting mouth 3 is first stopped by the casting amount adjusting plate 4, and the casting chute 5 is folded in two steps or oscillated in the left-right direction to escape. The operation of disconnecting and reconnecting the pipe 13 is performed. The above operation is repeated to complete concrete placement.

[0010]

According to the present invention, a concrete placing method for constructing an SRC underground continuous wall according to the present invention comprises:
A plurality of casting holes 3 are provided, and ready-mixed concrete is poured evenly and simultaneously in a range of one construction unit through a plurality of trummy pipes 13 connected thereto, so that work efficiency is good and concrete is poured. There is no problem such as splicing, and high quality concrete can be cast. In addition, the ready-mixed concrete mixer truck 14 that has arrived can supply the ready-mixed concrete sequentially without waiting time, and there is no need to increase the space for the leaning of the car. Furthermore, the concrete casting time can be shortened, and there is no restriction on the number of tremy pipes 13 to be installed in order to secure a space for the ready-mixed concrete mixer truck 14.

[Brief description of the drawings]

FIG. 1A is a plan view illustrating a concrete casting method using a casting hopper, and FIG. 1B is an elevational view.

2A is a plan view of a casting hopper, and FIG. 2B is a view taken along line II of FIG. 2A.

FIG. 3 is an enlarged sectional view of a casting hole.

FIG. 4 is a plan view showing an SRC underground continuous wall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casting hopper 2 Hopper main body 3 Casting mouth 4 Casting amount adjustment plate 11 Steel frame (H-shaped steel) 13 Ptolemy tube

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Atsushi Ogawara 2-5-1 Minamisuna, Koto-ku, Tokyo Takenaka Corporation Technical Research Institute Co., Ltd. (72) Inventor Toshio Hinata 8-1-1 Ginza, Chuo-ku, Tokyo No. Takenaka Corporation, Tokyo Head Office (72) Inventor Takashi Kimura 8-21-1, Ginza, Chuo-ku, Tokyo Inside Tokyo Company (72) Inventor Hitoshi Kurahashi 8-21 Ginza, Chuo-ku, Tokyo No. 1 Inside Takenaka Corporation Tokyo Main Store (72) Inventor Takatoshi Abe 2-4-10 Yaesu, Chuo-ku, Tokyo Inside Orient Development Co., Ltd. (56) References JP-A-48-10830 (JP, A ) J. 48-4267 (JP, Y1) (58) Fields surveyed (Int. Cl. ⁷ , DB name) E04G 21/04 102 E02D 5/20 102 E02D 15/04

Claims (1)

(57) [Claims] 1. A concrete設方method in the construction of SRC diaphragm wall, long enough hopper body in the lateral direction for storing receiving raw concrete, as the concrete outlet in the hopper body
Supplying the ready-mixed concrete in said hopper body the droplet設口having a striking設量adjusting plate laterally arranged plurality at intervals Rukoto, raw concrete mixer truck, etc., SRC underground continuous single construction unit One tremy tube is provided for each part partitioned by a steel frame on the wall, and each tremy tube is individually connected to each of the above-mentioned setting ports via a setting chute. , a work of pouring evenly and to simultaneously raw concrete to SRC diaphragm wall construction position of the punching設量adjustment plate operation to one construction unit and supplying ready-mixed concrete to the tremie pipe the punching設口, In accordance with the progress of concrete casting,
To stop the concrete flow and escape the casting chute
Starvation, repeating the work of pulling the tremie pipe, and wherein the respective concrete設方method in the construction of SRC diaphragm wall.