JP4387614B2 - Hybrid buttress-type open dam - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transmission-type sabo dam, and more particularly, to a hybrid buttress-type open dam comprising a buttress and a top slab and having a hybrid structure formed by combining a steel sheet pile and a concrete material, From another point of view, it is a sheet pile concrete structure dam intended to have a function as a transmission type sabo dam by omitting the upstream wall surface of the so-called buttress dam and making it open.
[0002]
The present invention is a permeation type sabo dam, particularly in a debris flow section where a debris flow occurs, for the purpose of capturing debris flow and reducing the debris flow peak flow rate, etc. It belongs to the technical field of transmission-type sabo dams, which are expected to maintain the sand storage capacity for the next debris flow, and can also be expected to have an effect as a driftwood stop if a drifting outflow is expected.
[0003]
Also, even in the headwater section, sediment should flow down as much as possible in rivers where there is little sediment flow when there is constant water discharge and the downstream river bed is drastically lowered. It belongs to the technical field of transmission type sabo dams.
[0004]
[Prior art]
Conventionally, the transmission type sabo dam in the debris flow section includes a comb-shaped concrete slit dam or a transmission type steel sabo dam. The comb-shaped concrete slit dam is formed by opening a large number of slits in a normal impervious concrete sabo dam and forming a comb shape, and a large number of walls between the slits are reinforced concrete. The transmission steel sabo dam has a frame structure in which steel pipes are joined by flange joints.
[0005]
[Problems to be solved by the invention]
Each of the conventional techniques has the following problems.
(1) The conventional comb-shaped concrete slit dam has the following problems.
(1) The cross section is reduced due to the wear of the concrete on the side surface of the slit.
(2) The impact resistance is reduced by the cold joint generated at the horizontal joint of concrete.
(3) Construction costs increase due to the complexity of design and construction due to the use of reinforcement and formwork.
[0006]
(2) The conventional transmission steel sabo dam has the following problems.
(1) A complicated design is required to allow local buckling of the steel pipe and plastic deformation of the entire structure.
(2) The cost is high because the steel pipe flange joint is used.
[0007]
Conventional comb-shaped concrete slit dams and transmission-type steel sabo dams have the above-mentioned problems, and thus their use has been sluggish. The present invention is intended to solve such conventional problems and to promote the spread of transmission type sabo dams.
[0008]
As an invention to solve such problems, the present applicant has assembled the upstream column material, the downstream column material, the intermediate column material, and these three column materials arranged in the upstream and downstream direction of the river as support works. An application has already been filed for a hybrid buttress-type open dam characterized by a buttress formed by filling concrete into an internal space of a steel frame formed by both side members formed (see Japanese Patent Application No. 2000-379687).
[0009]
In order to solve the above-mentioned conventional problems, the present invention aims to realize a high-strength transmission dam structure based on a concept different from the invention according to the above-mentioned application. That is, the present invention is not only a reinforcing bar for a comb-shaped concrete slit dam, but is constructed using a steel sheet pile group for structural strength improvement and wall surface reinforcement, thereby merely improving shear strength and wear resistance. In addition, it can be used as a formwork support and a wall panel for concrete placement (filling and hardening concrete), thereby simplifying design and construction, reducing costs, and solving the above-mentioned conventional problems It is something to try.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a plurality of buttresses arranged at regular intervals in the transverse direction of the river so as to form an opening, and a ceiling constructed on the top ends of the plurality of buttresses. In the hybrid buttress-type open dam having end slabs and functioning as a transmission-type sabo dam, the buttress includes left and right side materials, upstream surface materials, and downstream surface materials arranged in the upstream and downstream direction of the river as a formwork. The internal space is filled with concrete, and the left and right side members are each composed of a plurality of sheet piles joined together in a straight line to provide a hybrid buttress-type open dam.
[0011]
The left and right side materials, the upstream surface material, and the downstream surface material are made of steel.
[0012]
The left and right side materials, the upstream surface material, and the downstream surface material have stud bolts fixed to their inner surfaces.
[0013]
The top slab is made of a steel plate fixed in buttress concrete and arranged so as to protrude from the top end, and the top end upstream surface material, the top end downstream surface material, and the top end top surface material are used as a formwork. It is a reinforced concrete structure in which the interior space is filled with concrete.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a hybrid buttress-type open dam according to the present invention will be described below with reference to the drawings based on examples. FIG. 1 is a view for explaining an embodiment of a buttress-type open dam according to the present invention, FIG. 1 (a) is a perspective view of the buttress-type open dam, and FIG. 1 (b) is a view showing foundation concrete. is there. 2-4 is a figure explaining the detail of the Example of the buttress type open dam based on this invention. An embodiment of a buttress type open dam according to the present invention will be described with reference to FIGS.
[0015]
This hybrid buttress-type open dam 1 is characterized by a concrete structure in which an opening 3 through which small and medium water flows and earth and sand flows is provided between a plurality of buttresses 2 provided in the river transverse direction, and inside and outside the concrete structure. It is a hybrid buttress-type open dam characterized by a hybrid structure (composite structure) reinforced with steel sheet piles.
[0016]
In FIG. 1A, this hybrid buttress type open dam 1 includes a plurality of buttresses 2 (gutter walls) provided on a foundation concrete 4 so as to form openings 3 at appropriate intervals in the river transverse direction. ) And a top end slab (top girder) 5 is constructed in the river transverse direction on the top end (top end) of the plurality of buttresses 2. Through the openings 3 between the plurality of buttresses 2, the running water and earth and sand in the medium and small water flows down.
[0017]
The buttress 2 includes left and right side members 6, an upstream member 7, and a downstream member 8, and is constructed by placing concrete 9 in an internal space surrounded by these member 6-8. In order to provide resistance against impact against rocks and driftwood, the left and right side members 6 are formed of a group of a plurality of steel linear sheet piles 10, and the upstream surface member 7 and the downstream surface member 8 are formed of steel plates. Has been.
[0018]
Also, a plurality of stud bolts 11 are fixed to the inner surfaces of the left and right side members 6, the upstream surface member 7, and the downstream surface member 8 so as to project from the respective surface members 6, 7, 8. Adhesion with concrete 9 is further strengthened. In short, each of the face members 6, 7, 8 is firmly connected to each other by the concrete 9.
[0019]
FIG. 2A shows the side surfaces of the left and right side members 6. The side members 6 each have a plurality of sheet piles 10 in the longitudinal direction of the river ("vertical direction", that is, upstream and downstream). They are arranged in a straight line and connected to each other. As for the sheet pile 10, the front-and-rear edge is formed as the cross-section hook part 12. FIG. The sheet piles 10 adjacent to each other in the front-rear direction are coupled to each other by engaging the hook portions 12 of the front and rear sheet piles 10 as shown in FIG. 3A (cross-section CC in FIG. 2A). Yes.
[0020]
Of the sheet piles 10 constituting the left and right side members 6, the sheet pile 10 at the downstream end and the downstream sheet member 8 are as shown in FIG. 3B (an enlarged view of the main part E of FIG. 2A). The hook portion 12 of the sheet pile 10 is engaged with the engaging protrusion edge 13 of the downstream face member 8 and coupled to each other.
[0021]
The left side member 6 and the downstream side member 8 are inserted into the foundation concrete 4 shown in FIG. 1B in the portion below the imaginary line XX in FIG. 2A and FIG. 4B. It is inserted into the hole 14 and erected.
[0022]
As shown in FIG. 3C (C-C cross-sectional view in FIG. 2A), flanges 15 are welded to the left and right on the lower surface of the upstream face member 7, and these flanges 15 are connected to the left and right side members. The upstream face material 7 is placed on the inclined upper ends of the left and right side face materials 6 so as to abut on the inner surface of the left and right side faces 6, and the upstream face material 7 is attached in an inclined state as a whole.
[0023]
In this embodiment, a vertical surface material 7 ′ is welded to the upstream end (the left lower end in FIG. 2) of the upstream surface material 7, and is composed of left and right side materials 6, an upstream surface material 7 and a downstream surface material 8. The front end of the mold is closed with a vertical surface material 7 ′.
[0024]
Before the concrete 9 is placed in the mold frame composed of the left and right side members 6, the upstream member 7 and the downstream member 8 standing on the foundation concrete 4, FIGS. 2 (a), 2 (b) and FIG. 4 (a) and 4 (b), two U-shaped reinforcing steel plates are in contact with each other back to back at the upper part on the downstream side of the left and right side members 6, that is, near the top end of the buttress. An H-shaped support column 16 is arranged.
[0025]
By placing concrete 9 in a mold made up of left and right side members 6, upstream surface material 7 and downstream surface material 8, the lower part of this column 16 is fixed with concrete 9 and the upper part of buttress 2. It is arranged to protrude upward from the top end.
[0026]
After a plurality of buttresses 2 having the above configuration are constructed on the foundation concrete 4, the top end downstream face member 17 and the top end downstream face member 18 are arranged on the top end portion of the buttress 2 so as to sandwich the column 16. , And are connected to each other by a binding material 21. Further, a top end top surface material 19 is placed on the top end downstream surface material 17 and the top end downstream surface material 18 to form a formwork of the top end slab 5. A concrete casting hole 20 is formed in the top end top material 19.
[0027]
In this way, the formwork of the top end slab 5 is formed, but in some cases, a side end face material (a side end face material disposed at an end portion in the transverse direction of the river, not shown) is attached. It is done. Concrete is cast from the concrete placing hole 20 into the formwork of the top slab 5. Thereby, the buttress type open dam 1 shown in FIG. 1A is constructed.
[0028]
In the buttress 2 of the present invention, the left and right side members 6 are made of steel sheet piles 10 having resistance to impact, the upstream side member 7 and the downstream side member 8 are formed of steel plates, and concrete is placed therein. The hybrid structure is not only extremely strong against the impact force of debris flow, but even if the surface comes into contact with debris flow or debris flow, the surface of the wall panel is worn due to wear resistance. Wear and tear can be suppressed.
[0029]
Furthermore, the left and right side members 6, the upstream member 7, and the downstream member 8 function not only as members that increase the structural strength, but also as molds for placing concrete.
[0030]
FIG. 5 shows another embodiment, FIG. 5 (a) shows a side view of the buttress and FIG. 5 (b) shows a BB cross section of FIG. 5 (a). This another embodiment is substantially the same as the above embodiment, but is different from the above embodiment in that the portion below the imaginary line XX of the buttress 6 is inserted into the insertion hole 14. That is, in this other embodiment, a part of the upstream face material 7 (upstream end; lower left end portion in FIG. 5) is inserted into the insertion hole 14 formed in the foundation concrete 4 shown in FIG. The configuration is characterized in that the vertical surface member 7 'is not provided as in the above embodiment.
[0031]
As mentioned above, although the embodiment of the hybrid buttress type open dam according to the present invention has been described based on the examples, the present invention is not particularly limited to such examples, and the technical matters described in the claims It goes without saying that there are various embodiments within the scope of the above.
[0032]
【The invention's effect】
According to the configuration of the present invention as described above, the following effects are produced.
(1) The opening degree of the water passage part is not inferior to that of conventional transmission steel sabo dams, so that the debris flow trapping effect and the debris flow peak flow rate reduction effect are demonstrated and the sediment flow ability is reduced during medium and small floods. It is possible to prepare to capture the next debris flow by ensuring the sand storage capacity without causing sedimentation.
[0033]
(2) Compared with the conventional transmission type steel sabo dam 1 and the comb concrete slit dam, a dam having a hybrid structure made of steel concrete is obtained. That is, the steel concrete structure constituting the buttress according to the present invention is reinforced from the inside and outside of the concrete frame by a wall panel composed of a plurality of sheet piles having impact resistance and wear resistance. Therefore, it not only has a very large shear strength against the impact force of debris flow, but also suppresses the wear of the side of the buttress due to the wear resistance of the wall panel even if the surface is in contact with the debris flow or debris flow. Can do.
[0034]
(3) Utilizing steel sheet piles instead of reinforcing bars, it can be used not only for strength and strength improvement but also as a formwork for concrete placement, simplifying and streamlining design and construction Can be achieved. This can also reduce the construction cost to about half that of a conventional transmission steel dam.
[Brief description of the drawings]
FIG. 1 (a) is a perspective view showing a configuration of an embodiment of a hybrid buttress type open dam according to the present invention, and FIG. 1 (b) shows an insertion hole 1 formed in foundation concrete. FIG.
2 (a) is a side view of the buttress of the hybrid buttress-type open dam of the above embodiment, FIG. 2 (b) is a cross-sectional view along AA, and FIG. 2 (c) is B- B sectional drawing is shown.
3A is a view showing a CC cross section of FIG. 2A, and FIG. 3B is a view showing details of an essential part E of FIG. 2A. 3 (c) is a view showing a DD cross section of FIG. 2 (a).
FIG. 4 (a) is a plan view of an essential part of the hybrid buttress-type open dam of the above embodiment, and particularly shows a plan view of the top end slab 5. FIG. 4 (b) is a plan view of FIG. It is a figure which shows the AA cross section seen from the downstream of ().
FIG. 5 shows another embodiment, FIG. 5 (a) shows a side view of the buttress and FIG. 5 (b) shows a BB cross section of FIG. 5 (a). .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hybrid buttress type open dam 2 Buttress 3 Opening part 4 Foundation concrete 5 Top end slab 6 Left and right side material 7 Upstream surface material 7 'Vertical surface material 8 Downstream surface material 9 Concrete 10 casted in buttresses Sheet pile 11 Stud bolt 12 Hook 13 Locking projection edge 14 Concrete concrete insertion hole 15 Flange 16 Strut 17 Top end upstream face material 18 Top end downstream face material 19 Top end top face material 20 Concrete placement hole

Claims (3)

A plurality of buttresses arranged at regular intervals in the crossing direction of the river so as to form an opening, and a top slab erected on the top of the plurality of buttresses, as a transmission type sabo dam In the hybrid buttress type open dam with functions,
The buttress is made by filling concrete into the internal space with the left and right side members, upstream surface members and downstream surface members arranged in the upstream and downstream direction of the river as a formwork,
The left and right side members are each composed of a plurality of sheet piles joined together in a straight line ,
The hybrid buttress-type open dam , wherein the left and right side members, the upstream member and the downstream member are made of steel . The hybrid buttress-type open dam according to claim 1 , wherein stud bolts are fixed to inner surfaces of the left and right side members, the upstream member, and the downstream member . The top slab is made of a steel plate fixed in buttress concrete and arranged so as to protrude from the top end, and the top end upstream surface material, the top end downstream surface material, and the top end top surface material are used as a formwork. The hybrid buttress-type open dam according to claim 1 or 2 , wherein the inner space is a reinforced concrete structure filled with concrete .

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