JPS5854115A - Method of burrying outlet piping in concrete dam - Google Patents

Abstract

PURPOSE:To form a gap in a bottom of an outlet work body and to enable to perform a reliable implantation of grout, by a method wherein a wire net is placed halfway between a bottom of an outlet work body and a lower end of a web, and in parallel to the bottom of the outlet work body, and baseboards are situated to the opposite ends of the web. CONSTITUTION:A wire net 7 is located halfway between a bottom 2 of an outlet work body 1 and a lower end 5 of a web 4 and in parallel to the bottom 2 of the outlet work body 1, and baseboards 8 and 8' are attached to opposite ends 6 and 6', respectively, of the web 4. The outlet work is installed on a driving surface X-X of lift concrete A by means of a support 13. Lift concrete B is then placed. A gap 11 between the bottom 2 of the outlet work body 1 and the lift concrete B firstly placed is filled with grout C implanted through gaps 12 and 12' between both side boards 3 and 3' and baseboards 8 and 8' of the outlet work body 1. Life concrete is then deposited, in order, to bury the outlet work.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for burying a discharge pipe of a dam in a concrete dam, and more particularly, to a gracting work on the bottom of the discharge pipe when burying the discharge pipe in a concrete dam.

The discharge hole for water level III'RJ of the dam is provided approximately halfway between the base and the top of the dam. Conventionally, the outlet has been established by pouring concrete so that the area becomes an opening when the dam is constructed, but since the inner wall material of the outlet is concrete, the discharged water and the sand and mud in the discharged water can It was susceptible to mechanical erosion and had problems with maintenance and management. In order to solve this problem, in recent years a method has been adopted in which a steel tubular structure is used as a discharge pipe and is dug into the concrete of the dam during construction of the dam. The discharge pipe is provided with an attached device such as an r-t device inside, and is not necessarily a simple structure, but its external base body shape is similar to that shown in Figure 3 (!L) (b). As shown in FIG. 1, a large number of reinforcing plates called webs 4 are provided on the outer periphery of the discharge pipe body 1, which is a tubular body with a square or rectangular cross section, at approximately equal intervals over the entire length of the discharge pipe body 1. for example,
The discharge pipe body with a cross section of 4m x 4ms and a total length of 15m has a thickness of 16
-1 Webs with an overhang height of 580 cm are installed at a pitch of 650 wm. Concrete pouring when constructing a dam is usually done by pouring concrete from the base one by one so that the thickness of the concrete is 1 to 2 meters in each pour.
Concrete that is cast 01 times is called 1-lift concrete.

The huge discharge pipe as mentioned above is constructed by installing the discharge pipe on the support 13 on the lift concrete μ immediately before the discharge management facility during the concrete placement process, and then sequentially pouring the lift concrete. Although it is buried from Ikukoto K,
In the cough construction method, not only is the concrete used hard-mixed concrete with poor fluidity, but also the discharge pipe is provided with many webs 4 that obstruct the distribution of concrete. A large number of solids are generated between the concrete and the lift concrete in contact with it. This gate must be rounded and filled with grout to securely support the discharge pipe and protect the discharge pipe body 1 from water pressure during discharge. Therefore, a method has been adopted in which a large number of grout injection holes are bored by gas cutting, and after the grout is injected, the grout injection holes are closed again by welding. In the cough grouting method, high heat is repeatedly applied to the discharge pipe body by drilling, welding, etc., which not only causes deterioration of the material of the discharge pipe body, but also has the drawback that grouting becomes uncertain for the following reasons. In other words, the bottom surface 4 of the discharge pipe main body 1
There is no regularity in the formation of gates between the gate and the lift concrete that is in contact with it, and the distribution of position, size, and height is irregular. Therefore, it cannot be expected that the position of the grout injection hole drilled from the inside of the discharge pipe matches the position of the generated id, and it is inevitable that the maid will remain without grout being injected. When the height is less than about 5 aw I, filling tends to be insufficient and the grouting of the bottom of the discharge pipe becomes uncertain.

The inventors of the present invention have conducted intensive research on a method to ensure grouting of the bottom of the outlet pipe when burying the outlet pipe in concrete @ embankment, and have determined the material of the outlet pipe body and the lift that should be in contact with it. The present invention was completed based on the discovery that grouting can be reliably performed by providing a gap between the concrete and the concrete that is sufficient for grouting.

An object of the present invention is to provide a method for managing and installing water into a concrete dam, which can reliably grout the bottom of the main body of the discharge pipe when burying the discharge pipe in a dam.

When embedding a discharge pipe into the concrete dam of a dam, the present invention provides for the following: (1)) Install a wire mesh parallel to the bottom of the discharge pipe main body and install wainscoting over the entire length of the discharge pipe at both ends of the web. (C) Place the buried first lift concrete, (d)
) Grout is injected into the gap formed by the wire mesh between the bottom of the discharge pipe body and the buried first lift concrete through the gap formed by the side surface of the discharge pipe body and the wainscot, and then (8) Next. Lifted concrete was poured from the concrete.

This is a method for managing and installing water into a concrete dam, which is characterized by burying a discharge pipe in the concrete dam using the above procedure.

Hereinafter, the present invention will be described as one embodiment of the present invention! This will be explained in detail based on the attached Figures 1 and 2 showing Mr. A.

In the present invention, the discharge pipe refers to the outer periphery of the discharge pipe main body l.
Webs 4 are attached at approximately equal intervals over the entire length. In addition, the lift concrete immediately before the discharge control facility
Tom refers to the lift concrete immediately before a part of the discharge pipe main body 1 is buried by placing the next lift concrete, and the lift concrete that is next to the lift concrete A immediately before burying. The lift concrete in which a part of the discharge pipe is buried is referred to as "Salting Usagi 1 Lift Concrete B", and Y-Y represents the pouring surface of the buried first lift concrete B.

In the present invention, the trenching of the discharge pipe is carried out in the following (a) or -
).

(!L) Processing of the discharge pipe A wire mesh is placed between the bottom surface 2 of the discharge pipe body 1 and the lower end 5 of the web 4 in parallel to the bottom surface Z of the discharge pipe body 1 over the entire length of the discharge pipe body 1 and the entire width of the web 4. 7 and wains 8 and 8' are attached to the opposite ends 6 and 6' of the web 4 over the entire length of the discharge pipe. bottom li
j-me and wire mesh7. The distance between the grout C and the grout C, which will be described later, is selected to allow smooth injection and filling, but in the present invention, it is selected from 10 to 403 depending on the injectable root of the grout C, which corresponds to the full width of the web 4. . The first moat established as wire mesh 7
When pouring concrete B, the concrete hardly passes through the wire mesh #1, and when pouring and filling grout 0, the grout passes through the wire mesh easily, generally #1.
A 0 to 40-mesh wire mesh, preferably a 10-mesh wire mesh, is used. The upper ends 9 and 9' of the wainscots 8 and 8'c are the buried first
Lift concrete IJ-) Concrete formed by pouring B) iY-Y 10~Δ) It is attached to both ends 6 and 6' of the web 4 over the entire length of the discharge pipe. The wainscoting boards 8 and 8' are the joints where the first lift concrete is placed with gold M47 and the wainscoting boards 8 and 8'.
It is attached so that it hardly penetrates beyond the upper ends 9 and 9' of the discharge pipe body 1 into the gap 11 formed by the bottom surface 3 of the discharge pipe main body 1 and the wire mesh 7. The waist plates 8 and 8' may be made of thin steel plates, and the means for weiring these to the ends 6 and 6' of the web 4 may be as simple as spot welding or intermittent welding. wire mesh 7
In order to prevent the wire mesh from being distorted by the concrete pressure when placing the buried first lift concrete IJ-) B, reinforcing bars may be placed as appropriate.

(11) Oiling the discharge pipe The discharge pipe that has been processed in step (a) above is treated in the same manner as the conventional method, and the surface X where lift concrete is placed immediately before burying.
- Installed by support 13 on X.

(C)! Placement of first lift concrete B (1
)) Continuing to the process, the first excavation lift concrete B is placed according to the conventional method. By pouring, the discharge pipe body 1
A void 11jll is created between the bottom surface 2 of the buried first lift concrete IJ-) B by the action of the wire mesh 7, and a void 12jll is created between the side plates 3 and 3' of the discharge pipe main body 1 and the waist boards 8 and 8'. and 12' are formed.

((1) The space between the bottom surface 2 of the discharge pipe body 1 formed in the grout O injection and filling (C) process and the concrete B of the discharge pipe body 1 [11], the both side plates of the discharge pipe body 1 3 and 3' and the wainscoting boards 8 and 8' are injected with grout 0 from the cavities [12 or 12'].

Although various types of grout can be used, it is preferable to use a high-strength, non-shrinking grout that has a strong and complete supporting force to withstand the impact of water discharge. For example, non-shrinkable glau) p NL -87
00HK ('#13 Product name = Date 11 Star Bill Finishing's grout etc. corresponds to this.

Injecting Glau) C into the void 11 from one side of the void 11,
Sunahachi sky l! 112 or 12' to the other. The injection method may be any of the commonly used hopper ratio method, pump ratio method, etc.

Concrete paste may seep into the void ll when pouring the buried first lift concrete B through the wire mesh 7, so wash it with pressurized water and blow it away, and remove the remaining water with pressurized air. It is preferable to carry out a pretreatment such as blowing away the grout using a grout prior to grout injection.

(e) Placing lift concrete (after the injection light tjA of grout 0 in the grade process is completed, lift concrete for the next layer and subsequent layers is placed in sequence, and the discharge pipe is buried).

The present invention provides a method for controlling discharge into a conch IJ-) tyi embankment and has the following percentage characteristics.

(a) By performing simple processing on the discharge pipe, it is possible to regularly form voids of a height and width suitable for grout injection at the bottom of the discharge pipe main body.

(b) Since the discharge pipe is processed using a web, there is no sudden impact on the discharge pipe body.

ㅅ(c) The pinch of the web is usually less than 1 m, and the upper limit of the injection width when pouring grout so that it flows from one mouth to the other is less than 1.5 m, so it is reliable. Grout injection filling can be carried out.

(b) Grouting at the bottom of the discharge pipe becomes more reliable because the grout passes through the wire mesh and fills the id, which forms under the wire mesh.

The present invention provides a method for excavating a discharge pipe into a concrete dam, which ensures grouting of the bottom of the discharge pipe in a simple manner by subjecting the discharge pipe to simple processing, and which has industrial advantages. The significance is also huge.

[Brief explanation of the drawing]

Fig. 1 is a side view of the discharge pipe in the process of being buried according to an embodiment of the method of the present invention; Partial broken cross-sectional view @Figure 3 # side view and side view of the discharge pipe in the process of being excavated using the conventional method Code used: 1: Discharge pipe body 2: Bottom surface of the discharge pipe body 3.3':
Discharge pipe main body side 4: Web 5: Web bottom end 6
．． 6': Web side edge 7: Wire mesh 8. g':
1s board 9.9': Upper end of the wainscot board 10.10': Lower end of the wainscot board 11: Gap between the bottom of the discharge pipe body and the first lift concrete 12.12': Gap between the side surface of the discharge pipe body and the wainscot board 13
:Support M: Lift concrete immediately before burial B: Excavation first lift concrete C Nigerac X-X:m Placement surface of lift concrete before installation Y-Y:
FI construction first seven concrete pouring surface application person
Nisso Master Pilders Co., Ltd. Agent Izuki
So-called

Claims (1)

[Scope of Claims] 1. When excavating a discharge pipe into a concrete dam of a dam, (&) the bottom surface of the discharge pipe main body and the lower end of a web provided on the outer periphery of the discharge pipe are connected to the discharge pipe. In the middle, attach a wire mesh parallel to the bottom surface of the discharge pipe main body over the entire length of the discharge pipe and the entire width of the web, and attach wainscoting to the both ends of the web over the entire length of the discharge pipe. (b) Install the chain discharge pipe with a discharge pipe moat. Install on the lift concrete just before (C) Place the trenched first lift concrete, and (d
) Glue is injected and filled into the void* formed by the action of the wire mesh between the bottom of the discharge pipe main body and the first on-site lift concrete through the gap formed by the side surface of the discharge pipe main body and the wainscoting, and then (e) Lift concrete from the next job will be placed in sequence. A method for managing water discharge into a concrete dam, characterized by installing a discharge pipe on a shelf in a concrete dam by the above procedure. 2. The method according to claim 1, wherein the wire mesh is a 10th to 40th wire mesh. 3. The method according to claim 1, wherein the distance between the bottom surface of the discharge pipe body and the wire mesh is 10 to 4o51. 4. The upper end of the wainscot is installed as far as possible from 10 to 205 I above the casting surface of the buried first lift concrete.L g-5: The grout to be injected and filled is a high-strength non-shrink grout. A method according to claim 1.