JPH09228347A - Construction method of temporary drainage channel for concrete dam Hadanai - Google Patents

Abstract

(57) [Summary] (Correction) [Problem] It is possible to reduce the labor and labor for construction, and safely, shorten the construction period, and reduce the construction cost without requiring highly specialized personnel. SOLUTION: This is a precast reinforced concrete member formed in a hollow tunnel shape following the cross-sectional shape of a temporary drainage channel to be constructed, and a discharge groove 4 is provided on the inner surface of the top end portion along the tunnel axis direction, and one end thereof is discharged. It communicates with the box 5, and the discharge box 5 is provided with a discharge port 7 in communication therewith, and the introduction paths 8 and 8 ′ for the internal landfill grout G are provided inside both sides from the upper part to the lower part. Using the temporary drainage channel cell 1 in which the discharge ports 11 and 11 ′ respectively communicating with the channels 8 and 8 ′ are provided at a plurality of locations, a required number of the temporary drainage channel cells 1 are continuously installed along the provisional drainage channel installation portion, and they are joined and integrated. After burying concrete at a predetermined height while leaving the periphery of the bottom surface of the required number of temporary drainage cells 1, a high-fluidity solidifying material 23 is placed and the temporary drainage cells 1 are buried.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a temporary drainage channel for constructing a dam in a concrete dam to allow overflow water to flow down until the dam body is completed, and to fill and seal the interior after the dam body is completed. The present invention relates to a construction method, particularly a construction method using a precast member.

[0002]

2. Description of the Related Art As a conventional method for constructing a temporary drainage canal in a concrete dam, a formwork is assembled on-site with steel or plywood according to the shape of a temporary drainage canal such as a hood type or an upper trapezoidal type, Along with the installation of supporting works, reinforcing bars are laid on the outside, and the grout pipes, injection holes, and drainage gutters used for closed concrete work after completion of the dam body are installed on the formwork, and then concrete is placed. A method of building by dismantling and removing the formwork and supporting works after the concrete has hardened is generally adopted.

[0003]

In the conventional construction method for a temporary drainage channel in a bank described above, a specialized worker such as a formworker or a rebar worker is temporarily required for assembling a formwork or supporting structure or assembling a rebar. Not only that, but it also requires a lot of labor.

Further, since it is necessary to install grout pipes, not only the work around the formwork is congested, but also the RCD construction method and the expansion rare construction method in which the dam body is divided by horizontal joints and concrete is placed in a wide area. In the rare construction methods such as the above, the construction process of the embankment concrete may be extended due to the construction work of the temporary drainage canal.

Further, since the dismantling and removal of the formwork after the concrete is cast are all performed manually in a narrow space, it is a laborious and dangerous work.

[0006]

In order to solve the above-mentioned conventional problems, the present invention is a precast reinforced concrete member formed in a hollow tunnel shape following the cross-sectional shape of a temporary drainage channel to be constructed. A discharge port 7 to which a discharge pipe 6 can be connected is provided from the outside of the temporary drainage channel cell 1, and an internal landfill grout introduction channel 8 is provided from the upper portion to the lower portion. A temporary drainage channel cell 1 in which a supply port 10 for connecting a supply pipe 9 for the internal landfill grout from the outside is provided in communication, and discharge ports 11 respectively communicating with the introduction path 8 are provided in a plurality of locations on the inner surface. Using the above, a mounting platform 17 composed of left and right supporting leg steel materials 14 and 14 which are erected on the levee body concrete of the lift before the provisional drainage channel is installed, and a horizontal receiving steel material 15 laid on the upper ends thereof, Temporary drainage And the required number series set along the installing part of,
The temporary drainage channel cells 1 are successively placed and supported on the mounting table 17 by sequentially contacting the front and rear joint end faces, and the temporary drainage channel cells 1 and 1 joined to the front and rear are mutually opposed to the joint end faces. The joint parts 2 and 2 provided are fastened together with the fastening metal fittings 19, the discharge pipe 6 is connected to the discharge port 7 of each temporary drainage channel cell 1, and the supply pipe 9 is connected to the supply port 10 to be integrally joined. After placing the concrete wall at a predetermined height, leaving the required number of temporary drainage channel cells 1 around the bottom surface area, high fluidity with excellent fluidity that does not require compaction around the temporary drainage cell 1 bottom area. Caking material 2
A concrete dam in which the temporary drainage channel cell 1 is buried by pouring 5 into the void below the bottom surface of the temporary drainage channel cell 1 and then filling the concrete in the upper layer one by one. It proposes a construction method for the temporary drainage canal.

Further, the present invention is a precast reinforced concrete member formed in a hollow tunnel shape following the cross-sectional shape of a temporary drainage channel to be constructed, and a discharge groove 4 is provided on the inner surface of the top end portion along the tunnel axis direction, One end thereof communicates with the discharge box 5, and the discharge box 5 is provided with a discharge port 7 that can connect the discharge pipe 6 from the outside of the temporary drainage channel cell 1, and both side parts from the upper part to the lower part. Internal landfill grout G introduction paths 8, 8'are provided inside the
Supply ports 10 and 10 'for connecting the supply pipes 9 and 9'of the internal landfill grout G from the outside of the temporary drainage channel cell 1 are provided in communication with the upper ends of the left and right introduction channels 8 and 8', and On the inner surface, a temporary 14 drainage channel cell 1 having discharge ports 11 and 11 ′ communicating with the left and right introduction channels 8 and 8 ′, respectively, is provided. Left and right supporting leg steel materials 14, 14
And a pair of front and rear mounting pedestals 17 composed of the horizontal receiving steel material 15 laid on the upper end of them and the required number of tentative drainages on the mounting pedestal 17. Road cell 1
Are sequentially placed and supported by contacting the front and rear joint end faces, and the joint portions 2 and 2 in which the temporary drainage channel cells 1 and 1 joined to the front and rear are mutually opposed to the joint end face And the discharge pipe 6 is connected to the discharge port 7 of each temporary drainage channel cell 1, and the supply pipes 9 and 9'are connected to the supply ports 10 and 10 'to join and integrate the required number of temporary drainages. After pouring the levee concrete to a predetermined height while leaving the periphery of the bottom of the channel cell 1, a high-fluidity solidifying material 25 having excellent fluidity that does not require compaction is attached to the periphery of the bottom of the temporary drainage channel cell 1. A concrete dam that can be placed and flowed and filled in the voids below the bottom of the temporary drainage channel cell 1, and then concrete dams can be sequentially placed in the upper layer and the temporary drainage channel cell 1 can be embedded in the concrete dam. We propose a construction method for temporary drainage.

[0008]

The temporary drainage channel cell 1 is a precast member, which can be installed while sequentially joining them and controlling their installation accuracy. Therefore, the assembly of formwork and support work, piping work for landfill grout, and concrete work. Work such as dismantling and removal after placing, moving and transporting formwork members, etc. is not required, work safety can be secured, construction labor is reduced and labor is also reduced, and no further specialized technical staff is required. Therefore, it is possible to shorten the construction period and reduce the construction cost.

Since the temporary drainage channel cell 1 is manufactured in a factory where strict quality control is carried out as a precast member, it is possible to obtain a high quality product with little variation in quality, and the construction management is easy.

Since the high-fluidity concrete is placed under the bottom slab of the temporary drainage channel cell 1, it can be densely placed under the bottom slab and the adhesiveness with the temporary drainage channel cell 1 can be secured.

Since the necessary reinforcing bars are incorporated in the temporary drainage channel cell 1, there is no protrusion of the reinforcing bar for connecting the temporary drainage channel cell and the concrete for the pouring bank.

After completion of the bank body, the temporary drainage channel is filled with landfill grout G
At the time of landfilling, the landfill grout pumping equipment pressure-feeds the landfill grout G such as concrete to the introduction passages 8 and 8'through the supply pipes 9 and 9 ', and the discharge ports 11 and 11' to the temporary drainage passage cell group 1 It is possible to sequentially discharge and fill the inside.

When the landfill grout G is filled, the landfill grout G reaches the inner air or the top end of the temporary drainage channel cell 1.
The water collected in the upper part of the
Can be reliably discharged from the discharge pipe 6.

[0014]

EXAMPLES First, the temporary drainage channel cell 1 used for the construction of the bank temporary drainage channel of the present invention will be explained.
3 to 6, is a precast reinforced concrete member formed in a hollow tunnel shape having a thickness of about 15 to 20 cm and a front-rear length of about 1 to several meters according to the cross-sectional shape of the temporary drainage channel to be constructed, As shown in FIGS. 3 and 4, a joint portion 2 such as a joint box is installed at a required position on the joint end faces before and after that.

Further, the temporary drainage channel cell 1 has ribs 3 on the outer circumferences of the front and rear ends in order to ensure the integrity with the bank concrete.
The rib 3 may be formed, and the joint portion 2 such as a bolt insertion hole or a joint box penetrating between the front and rear end surfaces of the rib 3 may be installed at a required position.

As shown in FIGS. 3 and 4, the temporary drainage channel cell 1 is provided with a discharge groove 4 on the inner surface of the top end thereof along the tunnel axis direction, and one end of the discharge groove 4 communicates with a discharge box 5. The other end is open to the joint end surface of the temporary drainage channel cell 1, and the discharge box 5 is provided with a discharge port 7 for connecting a discharge pipe 6 from the outside of the temporary drainage channel cell 1.

Further, the temporary drainage channel cell 1 is provided with the introduction passages 8 and 8'for the internal landfill grout G inside the both side portions from the upper portion to the lower portion, and the provisional drainage passage cells 1 and 8'are provided at the upper ends of the provisional drainage passages 8 and 8 '. Supply ports 10 and 10 'for connecting the supply pipes 9 and 9'of the internal landfill grout G from the outside of the drainage channel cell 1 are provided so as to communicate with each other. Discharge ports 11 and 1 communicating with the introduction paths 8 and 8 ', respectively.
1'is provided at a plurality of locations.

The introduction paths 8 for the landfill grout G do not necessarily have to be provided separately on the left and right, but by providing a plurality of them separately, the amount of grout discharged from a large number of discharge ports 11, 11 'per unit time is increased. In addition, it is possible to prevent the pressure feeding pressure from decreasing.

Next, a construction method for constructing a temporary drainage channel using the temporary drainage channel cell 1 will be described.

FIGS. 9 to 13 show the outline of the construction procedure of the present invention. The installation portion of the temporary drainage channel cell 1 (top A pair of left and right streaks 13 and 13 along the downstream direction) are arranged at a distance slightly smaller than the width of the cell bottom, and are set up in a series at intervals slightly smaller than the longitudinal width of the cell bottom. The supporting leg steel material 14 is fixed by welding.

A horizontal receiving steel material 15 is connected between the upper ends of a pair of left and right supporting leg steel materials 14, 14 by welding, and reinforcing braces 16 such as braces are welded and fixed between the adjacent supporting leg steel materials 14, 14, and the supporting leg steel materials are A mounting frame 17 for mounting and supporting the temporary drainage channel cell 1 is constituted by two sets of front and rear gate-shaped underframes composed of 14 and horizontal receiving steel materials 15, and a required number of these are installed along the installation portion of the temporary drainage channel. Make a line.

Horizontal receiving steel materials 1 in front of and behind the mounting base 17
Temporary drainage channel cells 1 and 1 that have been lifted by a required number of cranes on 5 and 15 are successively placed with the front and rear joining end faces in contact, and are joined forward and backward while positioning the installation plane and positioning vertically. (See Fig. 1 and Fig. 3), Horizontal bearing steel 1
The side surface of each cell 1 is locked by a slip prevention metal member 18 welded to the end portion of No. 5, and the joint portions 2 and 2 in which the temporary drainage channel cells 1 and 1 joined to each other are mutually opposed are bolts or cotters. It is fastened with the fasteners 19 such as.

At the time of this fastening, as shown in FIGS. 19 to 21, a water stop plate 20 made of an elastic plate such as rubber is interposed between the joint end surfaces of the temporary drainage channel cells 1 and 1, and further the joint portion is joined. Anchor bolt 2 is provided with a protective plate 21 made of plywood or a steel plate on the inner surface.
Install by 2 etc.

In addition, the discharge pipe 6 is connected to the discharge port 7 of each temporary drainage channel cell 1, and the supply pipes 9 and 9'are connected to the supply ports 10 and 10 '. Piping to grout pumping equipment.

If the precast member is installed over the entire length of the temporary drainage passage, the passage of vehicles is blocked. Therefore, as shown in FIG. 15, the temporary drainage passage cells 1 are installed at several places in the entire length in the upstream / downstream direction. Do not set discontinuous crossing points,
At a later date, this part may be constructed by assembling the form 23 by a conventional method and arranging the structural reinforcing bars 24 around the form 23.

After burying concrete concrete at a predetermined height, leaving the periphery of the bottom surface of the required number of temporary drainage channel cells 1 joined and integrated in this way, in the peripheral portion of the bottom surface of the temporary drainage channel cell 1. A fluidizing solidifying material 25, such as high-fluidity concrete that does not require compaction and is excellent in fluidity, flows reliably into the voids and can be densely filled, and flows into the voids below the bottom surface of the temporary drainage channel cell 1. By filling, and then pouring concrete in the upper layer one after another and burying the temporary drainage channel cell 1 in this,
A temporary drainage channel in which the temporary drainage channel cell 1 having the splint surface treatment on the outer peripheral surface and the bank concrete are reliably integrated is constructed.

When the fluid binder 25 is cast, a stop plate 26 is provided at a required position on the bottom of the joined temporary drainage cell group 1 to allow the fluid binder 25 to flow in a predetermined section. Stop with and make adjustments to the jointing of the levee concrete.

The Hashiuchi temporary drainage channel constructed in this way has the function of flowing down the overflow water generated up to the completion of the dam body, so that the overflow water flowing inside will be exposed to the inner surface of the temporary drainage channel cell 1. Discharge groove 4, discharge box 5 and discharge port 11,
It is necessary to hermetically protect 11 ', and for that purpose, a filling material 27 such as wood is loaded in the discharge groove 4, and a protection plate 28 such as a steel plate is applied to the lower part of the filling material 27 and attached with nails or bolts, A similar protective plate 29 is applied to the front surface of the discharge ports 11 and 11 ', and the discharge ports 11 and 11' are attached with nails or bolts.

After completion of the bank body, reclaimed grout G in the temporary drainage channel.
When filling up with, the protection plate 28 in the temporary drainage channel cell 1,
29 and the padding 27 are removed, and in this state, the landfill grout pumping equipment pressure-feeds the landfill grout G such as concrete to the introduction passages 8 and 8'through the supply pipes 9 and 9 ', and the temporary discharge from the discharge ports 11 and 11'. The first group of passage cells are sequentially discharged and filled.

At this time, the internal air and the temporary drainage channel cell 1
The water accumulated in the upper part of the landfill grout G reaching the top end of is introduced into the discharge groove 4 and the discharge box 5, and the discharge pipe 6
Can be reliably discharged.

[0031]

As described above, according to the present invention, the work of assembling the formwork and the support work, the piping work for the landfill grout, the dismantling and removal after the concrete placement, and the moving and carrying of the formwork member are unnecessary. As well as ensuring the safety of work, the labor for construction can be reduced and the labor can be reduced. Further, since highly specialized technical personnel are not required, it is possible to shorten the construction period and reduce the construction cost.

Since the temporary drainage channel cell is manufactured as a precast member in a factory where strict quality control is carried out, it is possible to obtain a high quality product with little variation in quality, and the construction management is easy.

Since the high-fluidity concrete is placed under the bottom slab of the temporary drainage channel cell, it can be cast firmly under the bottom slab, and the adhesion integrity with the temporary drainage channel cell can be secured.

Since the necessary reinforcing bars are incorporated in the temporary drainage channel cells, there is no protrusion of reinforcing bars for joining the temporary drainage channel cells and the concrete for the embankment.

When the temporary drainage channel is to be filled with landfill grout after the completion of the bank body, the landfill grout pumping equipment pumps the landfill grout to the introduction channel through the supply pipe, and the temporary drainage channel group from the discharge port. It is possible to sequentially discharge and fill the inside.

When the landfill grout G was filled, the landfill grout G reached the inside air or the top end of the temporary drainage channel cell 1.
The water collected in the upper part of the
Can be reliably discharged from the discharge pipe 6.

[Brief description of drawings]

FIG. 1 is a partial side view showing a construction state of the present invention.

FIG. 2 is a front view showing an installed state of the temporary drainage channel cell of the present invention.

FIG. 3 is a vertical cross-sectional side view showing a piping state of the temporary drainage channel cell of the present invention.

FIG. 4 is a vertical cross-sectional front view showing a piping state of the temporary drainage channel cell of the present invention.

FIG. 5 is a perspective view showing an embodiment of a temporary drainage channel cell used in the present invention.

FIG. 6 is a front view showing an aspect of a temporary drainage channel cell used in the present invention.

FIG. 7 is a perspective view showing another aspect of the temporary drainage channel cell used in the present invention.

FIG. 8 is a front view showing another embodiment of the temporary drainage channel cell used in the present invention.

FIG. 9 is a front view showing one embodiment of the construction procedure of the present invention.

FIG. 10 is a front view showing another aspect of the construction procedure of the present invention.

FIG. 11 is a front view showing another aspect of the construction procedure of the present invention.

FIG. 12 is a front view showing another aspect of the construction procedure of the present invention.

FIG. 13 is a front view showing another aspect of the construction procedure of the present invention.

FIG. 14 is a front view showing another aspect of the construction procedure of the present invention.

FIG. 15 is a front view showing another aspect of the construction procedure of the present invention.

FIG. 16 is a front view showing another aspect of the construction procedure of the present invention.

FIG. 17 is a vertical cross-sectional front view showing one mode of the top end portion of the temporary drainage channel cell used in the present invention.

FIG. 18 is a vertical sectional front view showing one mode of a side surface portion of the temporary drainage channel cell used in the present invention.

FIG. 19 is a vertical sectional side view showing a state before joining the temporary drainage channel cell of the present invention.

FIG. 20 is a vertical sectional side view showing a joined state of the temporary drainage channel cell of the present invention.

FIG. 21 is a vertical cross-sectional side view showing a landfill state of the temporary drainage channel cell of the present invention.

[Explanation of symbols]

 1 Temporary drainage channel 2 Joint part 3 Rib 4 Discharge groove 5 Discharge box 6 Discharge pipe 7 Discharge port 8 Introduction path 8'Introduction path 9 Supply pipe 9'Supply pipe 10 Supply port 10 'Supply port 11 Discharge port 11' Discharge port 12 Embankment concrete 13 Reinforcing bar 14 Support steel material 15 Horizontal receiving steel material 16 Reinforcing rebar 17 Mounting stand 18 Anti-slip metal fitting 19 Fastening metal fitting 20 Water stop plate 21 Protective plate 22 Anchor bolt 23 Form 24 Structural steel bar 25 Liquid cement 26 Stop plate 27 Filling 28 Protective plate 29 Protective plate G Landfill grout

Claims (2)

[Claims] 1. A precast reinforced concrete member formed in a hollow tunnel shape that follows the cross-sectional shape of a temporary drainage channel to be constructed, and has a discharge port at the top end to which a discharge pipe can be connected from the outside of the temporary drainage channel cell. In addition, an introduction path for the internal landfill grout is provided from the upper part to the lower part, and a supply port for connecting a supply pipe for the internal landfill grout is provided in communication from the outside of the temporary drainage channel cell to the introduction path, and further the inner surface is further provided. A temporary drainage channel cell that has multiple outlets that communicate with the introduction channel is used for each of the left and right supporting leg steel materials that are erected on the concrete body of the lift before installing the temporary drainage channel, and those A required number of mounting bases made of horizontal steel bearings on the upper end are continuously installed along the installation part of the temporary drainage channel, and temporary drainage channel cells are successively contacted with the front and rear joint end faces on this mounting base. Supports continuous placement Then, the temporary drainage cells that are joined to each other in the front and rear are mutually joined by fastening the joints that are provided facing each other on the joint end face, and the discharge pipe is connected to the outlet of each temporary drainage cell and the supply port is also connected. After connecting the supply pipe to, and placing the concrete wall at the specified height, leaving the periphery of the bottom of the required number of jointly integrated temporary drainage channels, compact it around the bottom of the temporary drainage channel. A high-fluidity solidifying material that is unnecessary and has excellent fluidity is placed and flowed into the void below the bottom of the temporary drainage channel cell to fill it, and then concrete dams are sequentially placed in the upper layer and temporarily drained to this. Construction method of temporary drainage canal for concrete dam, which is characterized by burying road cells. 2. A precast reinforced concrete member formed in a hollow tunnel shape following the cross-sectional shape of a temporary drainage channel to be constructed, wherein a discharge groove is provided on the inner surface of the top end portion along the tunnel axis direction, and one end thereof is discharged. It is connected to the box, and this discharge box is provided with a discharge port that can connect the discharge pipe from the outside of the temporary drainage channel cell.In addition, from the upper part to the lower part, the introduction route of the internal landfill grout is provided inside both sides. A supply port for connecting a supply pipe for the internal landfill grout from the outside of the temporary drainage channel is provided in communication with the upper ends of the left and right introduction passages, and the inner surface is connected with the left and right introduction passages, respectively. Using temporary drainage cells with multiple discharge ports, the left and right supporting steel members that were erected on the levee concrete of the lift before installing the temporary drainage channels and the water that was bridged to the upper ends of them. Two sets of front and rear mounting bases made of flat steel are continuously installed along the installation part of the temporary drainage channel, and the temporary drainage channel cells are successively connected to the mounting base on the front and rear joint end faces. The temporary drainage channel cells that are joined together front and back are joined together by fastening the joint parts that are provided facing each other to the joint end surface with the fastening metal fittings, and connect the discharge pipe to the discharge port of each temporary drainage channel cell. At the same time, connect the supply pipe to the supply port, and after placing the dam concrete at a predetermined height leaving the periphery of the bottom of the required number of jointly integrated temporary drainage cells, the bottom of the temporary drainage cell A high-fluidity solidifying material with excellent fluidity that does not require compaction is placed in the peripheral portion, and it is made to flow into the void below the bottom of the temporary drainage channel cell to fill it, and then concrete concrete is placed in the upper layer in sequence. The construction of the temporary drainage canal of the concrete dam, which is characterized in that the temporary drainage canal is buried in it. Method.