JP3536030B2 - Hybrid buttress type open dam - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission type erosion control dam, and more particularly to a hybrid steel structure having a buttress and a top end slab and having a steel concrete structure formed by combining steel and concrete materials. Regarding the buttress type open dam (the applicant abbreviates this as the "HB type open dam"), from another perspective, by omitting the so-called upstream wall of the so-called buttress dam and opening it (open) , A dam with a steel-framed concrete structure intended to function as a transparent erosion control dam.

That is, the present invention relates to a transmission type erosion control dam, in particular,
In a debris flow section of a mountain stream where a debris flow occurs, it is installed for the purpose of capturing the debris flow and reducing the peak flow rate of the debris flow, and maintaining the sand storage capacity for the next debris flow without sedimentation by small and medium floods. It belongs to the technical field of the transmission type sabo dam, which can be expected to be effective and can also be expected to be effective as a driftwood stop when driftwood is expected to flow out.

Even in the scavenging section, when the river is constantly flooded, the amount of sediment is small and the downstream riverbed is severely deteriorated. It belongs to the technical field of transparent erosion control dams, which are expected to be adjusted.

[0004]

2. Description of the Related Art Conventionally, there have been comb-shaped concrete slit dams or transparent steel sabo dams as transparent sabo dams in debris flow sections. The comb-shaped concrete slit dam is
A large number of slits are opened in a normal impermeable concrete erosion control dam to form a comb, and the many walls between the slits are reinforced concrete structures. The transmission type steel sabo dam is a frame structure in which steel pipes are joined by a flange joint, and is called a so-called lattice type steel sabo dam or a steel slit B type.

[0005]

Each of the conventional techniques has the following problems. (1) The conventional comb-shaped concrete slit dam has the following problems. The cross section is reduced due to the wear of concrete on the side surface of the slit portion. Cold joints that occur at horizontal joints of concrete cause a reduction in impact resistance. Construction costs increase due to the complexity of design and construction due to the use of reinforcements and formwork.

(2) The conventional transmission type steel sabo dam has the following problems. A complex design is required to allow local buckling of the steel pipe and plastic deformation of the overall structure. High cost due to the use of steel pipe flange joints.

The conventional comb-shaped concrete slit dam and the transmission type steel sand erosion dam have the above-mentioned problems, and thus their use has been conventionally sluggish. The present invention solves the above-mentioned conventional problems and aims to popularize a transmission type erosion control dam.

The present invention is intended to realize a high-strength structural type based on a new concept that does not belong to any concrete or steel structure such as a comb-shaped concrete slit dam or a transmission steel erosion control dam. . The present invention aims to realize a transmission dam structure of a so-called steel-framed concrete structure (hybrid structure of steel frame and concrete), which is positioned between a reinforced concrete structure and a steel structure in terms of structure.

According to the present invention, the comb-shaped concrete slit dam is constructed by utilizing not steel bars but steel frame steel groups for shear reinforcement and lightweight steel groups for wall reinforcement.
Not only to improve shear strength and abrasion resistance, but also to serve as formwork support and wall panels for concrete placement (filling and hardening concrete), thereby simplifying and streamlining design and construction, and reducing costs. This is intended to reduce the above problem and solve the above conventional problems.

The present invention relates to a sabo dam made of transparent steel,
By constructing a structure in which concrete takes the role of connecting steel members, it is possible to design in the elastic region, and by omitting the joint structure, it is possible to reduce costs and solve the above-mentioned conventional problems. To do.

[0011]

In order to solve the above-mentioned problems, the present invention provides a plurality of buttresses arranged so as to form openings at regular intervals in the transverse direction of a river, and the plurality of buttresses. Provided is a hybrid buttress type open dam having a top end slab installed on the top end and having a function as a transmission type sand control dam.

[0012] The buttress is a steel frame formed by an upstream side column material, a downstream side column material, an intermediate column material, and both side surface materials assembled by using these three column materials as a support work, which are arranged in the upstream and downstream directions of the river. It is a steel-framed concrete structure constructed by connecting the above three pillar members and both side surface members to each other by filling the interior space of the set with concrete.

Each of the upstream side column member, the downstream side column member and the intermediate column member is made of H-shaped steel so as to have impact shear resistance, and has resistance to eccentric load (cross river direction) due to gravel collision. In order to have a function as a supporting work for both side panels, the strong axis of the H-section steel is directed in the transverse direction of the river, and the upstream side column material and the downstream side column material and the intermediate column material are also provided. Arrange different heights.

The intermediate pillar has holes formed in multiple stages, and by placing shear reinforcing bars horizontally through the holes, slippage occurs between the intermediate pillar and concrete, and as a skeleton of a buttress, The structure is such that shear deformation does not occur, and the upstream side column member and the downstream side column member have top end tie members having a shear reinforcing function.

For both or one of the upstream side column material and the downstream side column material, a column material formed by integrally welding a half-divided steel pipe obtained by half-dividing a circular steel pipe into an H-shaped steel column is used.

A circular steel pipe or a square steel pipe may be used for the upstream side column member and the downstream side column member.

All or one or both of the above-mentioned upstream side pillar material, downstream side pillar material and intermediate pillar material are formed by arranging CT section steels on both sides and connecting the CT section steels arranged on both sides with reinforcing bars. Shaped members may be used.

The above-mentioned both-sides panels are both-sides panels assembled by using the above-mentioned upstream-side pillars, downstream-side pillars and intermediate pillars as a support work and using lightweight shaped steel so as to have abrasion resistance. .

The top slab is made up of a large number of H-shaped steel girders having shock-shear resistance installed on the buttress top and a bottom slab plate having wear resistance, an upstream surface steel and a downstream surface steel. It is a steel-framed concrete structure constructed by connecting steel materials by filling concrete into the internal space of the formed steel frame.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the hybrid buttress type open dam according to the present invention will be described in detail based on examples with reference to the drawings. 1 to 7 are views for explaining an embodiment of the present invention. FIG. 1 is a perspective view showing a schematic structure of an embodiment of a hybrid buttress type open dam according to the present invention. 2 to 4 are views for explaining the construction procedure of the embodiment of the hybrid buttress type open dam according to the present invention, and FIGS. 5 to 7 show the detailed structure of the embodiment of the hybrid buttress type open dam according to the present invention. It is a figure. The hybrid buttress type open dam according to the present invention will be described based on these drawings.

(Overall Structure) The feature of this hybrid buttress type open dam is that it has a structure in which openings for flowing running water and sediment in small and medium floods are provided between a plurality of buttresses provided in a river transverse direction, and moreover, a concrete structure. It is a buttress type open dam characterized by a hybrid structure (composite structure) in which the inside and outside of the are reinforced with steel frames.

In FIGS. 1 and 5 to 7, this hybrid buttress type open dam comprises a plurality of buttresses provided on a concrete foundation 1 so as to form openings 2 at appropriate intervals in the river transverse direction. (Bulletin wall) 3 is installed, and the top end slab 4 is attached to the top end of the plurality of buttresses 3.
Is built and the whole is built. Through the openings 2 between the plurality of buttresses 3, running water or sediment in small and medium floods flows down.

The buttress 3 is made of steel, and each is made of steel, such as an upstream side column member 5, a downstream side column member 6, an intermediate column member 7, both side face members (shown as both side face panels in the embodiment) 10, and shear reinforcement. Concrete (filled and solidified) cast into (filled and solidified) an internal space formed by the steel frame 11 to connect the steel frame 11 and the steel frame 11 including the reinforcing bars 8 and the top end tie material 9 and the like. ) 12 and.

Upstream side column 5, downstream side column 6, intermediate column 7
Is an H-shaped steel column to provide impact resistance, and in some cases circular steel pipes and square steel pipes are used for the former two,
A plurality of these column members 5, 6, and 7 are assembled to form a group of steel-framed steel columns. In addition, the side panel 10 is
A lightweight shaped steel having abrasion resistance is used, and an assembly of a plurality of side panels 10 is installed on the side surface to form a wall surface made of the lightweight shaped steel group.

The steel concrete structure of the buttress 3 according to the present invention is formed from the steel frame column group having impact resistance, the wall panel group of lightweight shaped steel having abrasion resistance, and the inner concrete. Since it has a hybrid structure, it not only has extremely high strength against the impact force of debris flow, but also suppresses the wear of the surface due to the abrasion resistance of the wall panel even if the surface comes in contact with debris flow and sediment flow. be able to.

Further, the steel frame 11 not only functions as a member for enhancing the structural strength, but also as a frame support and a frame panel for placing concrete.

The top end slab 4 is composed of a slab plate 13 which is installed on a plurality of buttresses 3 in a transverse direction of the river, a slab girder material 14 provided on the slab plate 13 in the same direction, and an upstream slab facing the upstream side. Formed by a slab steel frame 17 composed of a face material (hereinafter referred to as upstream surface material) 15 and a slab downstream surface material (hereinafter referred to as downstream surface material) 16 provided facing the downstream side, and this slab steel frame 17. It is constructed from concrete (slab internal concrete) 18 that is cast into the internal space.

The slab girder material 14 is made of H-shaped steel in order to have impact resistance against debris flow, like the upstream side pillar material 5, the downstream side pillar material 6 and the like. In addition, the upstream surface material 15
For the downstream surface material 16, a shaped steel is used in order to have impact resistance and abrasion resistance in consideration of collision with debris flow or driftwood.

(Detailed Structure and Construction Method) The detailed structure of the hybrid buttress type open dam according to the present invention will be further clarified through the explanation of the construction procedure with reference to FIGS.

The construction procedure is as follows: Preparatory work (degree), II. Construction of pillars, III. Placing buttress internal concrete, IV. It consists of the construction of the top slab, but the whole construction procedure is as follows (a)
-(L) (corresponding to (a)-(l) in FIGS. 2-4)
Will be described in order.

I. Preparation Step (a) Boxing of Basic Concrete (Fig. 2 (a)) On the surface of the basic concrete 1, a boxing 19 for building the upstream side pillar material 5, the downstream side pillar material 6, and the intermediate pillar material 7 is provided. To do. The size of the box punch 19 is formed as small as possible within the range in which the pillars 5, 6, and 7 can be built. In addition, when the entire buttress steel frame is temporarily assembled in an adjacent yard in advance and it is built as a unit, it is not necessary to open each box separately for each column, but it is long so that one row of column members can be inserted in the upstream and downstream directions. It is also possible to provide a box opener having a planar shape.

(B) Assembly of scaffold (Fig. 2 (b)) Assemble the working scaffold 20 on the foundation concrete 1.

II. Pillar material installation (c) Pillar material installation (Fig. 2 (c)) The upstream side pillar material 5, the downstream side pillar material 6, and the intermediate pillar material 7 are hung by a crane, and the lower end of each is erected. It is put in the box open box 19 and built. Regarding the upstream side column member 5, the downstream side column member 6, and the intermediate column member 7, H-shaped steel column members are used in this embodiment.
In addition, as the upstream side column member 5 and the downstream side column member 6, a circular steel pipe or a square steel pipe may be used instead of the H-shaped steel.

By the way, in this embodiment, as the upstream side column member 5, as shown in FIGS. 7 (a) to 7 (c), a half-divided steel pipe 21 in which a circular steel pipe is halved on the front surface of the H-shaped steel column member 5. The pillar material that is integrated by welding is used. When the half steel pipe 21 is thus provided on the front surface, the resistance of the fluid is reduced and the impact of debris flow or the like can be weakened.

(D) Temporary fastening of top end tie material (FIG. 2 (d)) Two top end tie materials 9 are installed between the upstream side pillar material 5 and the downstream side pillar material 6 through the intermediate pillar material 7. , FIG. 7 (a), (b)
As shown in FIG. 6, the upstream bolts 5 and the downstream pillars 6 are temporarily fastened to the upstream pillars 5 and the downstream pillars 6 with lock bolts 22.
And the intermediate pillar 7 is positioned.

(E) Placing concrete into the box punch 19 Concrete is poured into the box punch 19, and the upstream side pillar material 5,
The downstream side column member 6 and the intermediate column member 7 are fixed to the basic concrete 1 (see FIG. 2D, etc.).

III. Placing concrete (butless internal concrete) in the buttress (f) Arrangement of shear reinforcement bars (Fig. 3 (f)) Shear reinforcement bars 8 for one lift height (1.5 to 3 m) of concrete It is arranged through the holes of the pillar 7. The shear reinforcing bar 8 is arranged while being spliced by a lap joint if necessary.

(G) Attachment of side panel (FIG. 3 (g),
(G) ') On the inner surfaces of the upstream side column member 5 and the downstream side column member 6, and the intermediate column member 7
A pair of side surface materials (both side surface materials, also referred to as “both side surface panels” in the embodiment) 10 for one lift height are attached so as to come into contact with the outer surface of and are sandwiched from both sides.

Then, as shown in FIG. 2 (g) ', the upper and lower side panels 10 have their flanges 23 that abut each other fastened with a U-clip 24 for metal foam.
Further, the pair of side panels 10 are connected to each other by the U-clip 2
4 is tied with a number 25 and fixed. In this manner, the side panels 10 are sequentially arranged on the upper side so as to form the two wall surfaces, and the box body of the buttress steel frame 11 is sequentially constructed. Further, the side panel 10 forms a wall surface on the outer surface thereof against which quicksand, driftwood or the like contacts and collides.

(H) Placing Buttress Internal Concrete for 1 Lift For each lift, 1 lift of concrete is placed in the internal space surrounded by the side panel 10, the upstream side pillar 5 and the downstream side pillar 6. To set. Then, the above-described construction steps (f) to (h) are repeated until the lower end of the top slab. As a result, the steel frame 11 is completely fixed by the concrete and the buttress 3 having a solid hybrid structure is formed. Further, as shown in FIG. 7C, concrete 12 is also placed in the half steel pipe 21 of the upstream side column member 5.

IV. Construction of top slab (i) Installation of slab plate (Fig. 4 (i)) Next, the top slab 4 is constructed at the top of the plurality of buttresses 3 constructed in the transverse direction of the river. To
A steel corrugated slab plate 13 shown in FIG. 7A is installed on the top end of the buttress 3.

(J) Installation of slab girder material (FIG. 4 (j)) The temporarily fixed top end tie material 9 is removed, and a plurality of slab girder materials 14 are installed on the slab plate 13. As the slab girder material 14, as shown in FIG. 7A, an H-shaped steel material is used. After installing the slab girder material 14, all top tie materials 9
Is installed between the upstream side column member 5 and the downstream side column member 6 through the intermediate column member 7.

(K) Installation of Upstream / Downstream Surface Material (FIG. 4 (k)) The upstream surface material 15 and the downstream surface material 16 are supported at the upstream end and the downstream end of the top slab 4 by the supporting diagonal members 26 and are placed inside. Install it so that it does not fall. In this way, the steel frame 17 of the top slab 4 is formed.

(L) Placing slab internal concrete Slab plate 13, upstream surface material 15 and downstream surface material 16
Concrete 18 is poured into the space surrounded by (see FIG. 4 (k)). As a result, the top slab 4 is completed and the construction of the hybrid buttress type open dam is completed.

The above is the construction method of the buttress 3 and the top slab 4 of the hybrid buttress type open dam structure according to the present invention. For the buttress 3 of the hybrid buttress type open dam with a low dam height,
If a temporary assembly yard or crane operation yard can be obtained in the surrounding area, if necessary, temporarily assemble the steel columns, shear reinforcing bars 8 and side panels in a state of lying down, and raise the temporarily assembled buttress steel frame 11. It is also possible to adopt a construction method in which the buttress 3 is constructed by placing it in a predetermined place and placing internal concrete therein.

The range of specific implementation scale of the hybrid buttress type open dam structure according to the present invention is shown below. Dam height: 4-14.5m (Butless height: 2-
9.5m) Crown width ... 1.5-5m Gradient ... Upstream surface Upright-1: 0.8, Downstream surface Upright-1: 0.5 Open width (opening width) ... 1- 5m Buttress width ・ ・ ・ 0.6-1.2m Top end slab thickness ・ ・ ・ 1.0-2.0m

(Operation) With the plurality of buttresses 3, the debris flow can be captured, the peak flow rate of the debris flow can be controlled, and further driftwood can be captured. In addition,
The earth and sand at the time of small and medium floods flow down through the openings 2 between the buttresses 3.

Although the embodiment of the hybrid buttress type open dam according to the present invention has been described above based on the embodiments, the present invention is not particularly limited to such embodiments, and is described in the scope of claims. It goes without saying that there are various embodiments within the scope of technical matters.

[0049]

According to the configuration of the present invention as described above, the following effects are produced. (1) The openness of the water passage part, which is not inferior to that of the conventional transmission steel sabo dam, exerts a definite debris flow trapping effect and a debris flow peak flow reduction effect, and also reduces the debris flow capability during small and medium floods. It can be prepared to secure the sand storage capacity and capture the debris flow that comes next without being allowed to sediment.

(2) A dam having a hybrid structure made of steel concrete, which is stronger than the conventional transmission steel erosion control dam and comb concrete slit dam, can be obtained. That is, the steel-framed concrete structure constituting the buttress of the present invention is reinforced from inside and outside of the concrete frame by the steel-framed steel column group having impact resistance and the wall panel of the lightweight shaped steel group having abrasion resistance. Therefore, it not only has extremely high shear strength against the impact force of debris flow, but also suppresses the wear of the buttress side surface due to the abrasion resistance of the wall panel even if the surface comes in contact with debris flow or sediment flow. You can

(3) Further, the concrete plays a role of connecting the steel members to each other in this way to form a strong structure, thereby making a complicated plastic design like a transmission type steel sand dam. Even without it, you can do it with a simple elastic design.

(4) In this way, a steel frame H-shaped steel column group instead of a reinforcing bar and a lightweight shaped steel group for surface reinforcement are used not only for improving strength and proof strength but also for casting concrete. Since it can be used as a frame support and a wall panel, simplification and rationalization of design and construction can be achieved. Further, this can reduce the construction cost to about half the cost of the conventional transmission steel dam.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of an embodiment of a hybrid buttress type open dam according to the present invention.

FIG. 2 is a perspective view illustrating a construction method of the hybrid buttress type open dam of the above embodiment.

FIG. 3 is a perspective view illustrating a construction method of the hybrid buttress type open dam of the above embodiment.

FIG. 4 is a perspective view illustrating a construction method of the hybrid buttress type open dam of the above embodiment.

5A is a view showing a side surface, and FIG. 5B is a view showing FIG.
FIG.

FIG. 6 is a partial front view and a partial cross-sectional view of the above embodiment as seen from the upstream side.

FIG. 7 (a) is a view showing a cross section of the top end slab,
(B) is a plan view of (a), (c) is A- of (a).
FIG.

[Explanation of symbols]

1 foundation concrete 2 openings 3 buttress 4 top slab 5 Upstream side pillar material 6 Downstream column material 7 Middle pillar material 8 shear reinforcement 9 Top end Thai material 10 Side material (side panel) 11 steel frame 12 Buttress internal concrete 13 Slab plate 14 Slab girder material 15 Slab upstream surface material 16 Slab downstream surface material 17 Slab Steel Frame 18 Slab internal concrete 19 without box

Claims (4)

(57) [Claims] 1. A transmission type comprising: a plurality of buttresses arranged so as to form openings at regular intervals in a transverse direction of a river; and a top slab installed on the tops of the plurality of buttresses. A hybrid bag that functions as a sabo dam
In the tres type open dam, the above buttress is assembled by assembling multiple pillars.
The steel plates on both sides are assembled by using the
The interior space of the steel frame formed by
By connecting the above-mentioned pillar material and both side surface materials,
It is characterized by being constructed of steel frame concrete
Hybrid buttress type open dam. 2. A certain interval is provided in the transverse direction of the river.
Multiple buttresses arranged to form an opening
And a crown slab installed on the plurality of buttress crowns
And a hybrid bag that has the function of a transparent erosion control dam.
In the tres type open dam, the buttress is composed of an upstream side pillar material, a downstream side pillar material, an intermediate pillar material and both side surface materials which are assembled as a supporting work of these three pillar materials arranged in the upstream and downstream directions of the river. It is a high- strength concrete structure constructed by connecting the above three pillar members and both side members by filling concrete into the internal space of the formed steel frame.
Brid buttress type open dam. 3. The upstream column member, the downstream column member, and the intermediate column member are made of H-shaped steel so as to have impact shear resistance, and have resistance to eccentric load due to gravel collision, In addition, the strong axis of the H-section steel is directed in the transverse direction of the river so that it also serves as a support for both side panels, and the cross-sectional height of the above-mentioned upstream-side pillar material and downstream-side pillar material and intermediate pillar material is increased. 3. The hybrid buttress type open dam according to claim 2, wherein different heights are arranged. 4. The top slab is on the buttress top.
A large number of H-shaped steel girders installed on the
Rubbed bottom slab plate with abrasion resistance, upstream surface type
Internal void of steel frame formed by steel and downstream section steel
In the meantime, the steel materials are connected to each other by filling with concrete.
Characterized by being a steel-framed concrete structure constructed by
The hybrid buttress type open dam according to claim 1, 2 or 3.