JP2010261280A - Precast concrete corrosion-resistant free gradient water passage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To construct a free gradient water passage, which has a proper bottom shape and drain gradient and in which only a necessary part is made corrosion resistant, only by precast concrete. <P>SOLUTION: An invert made of corrosion-resistant concrete having a proper bottom shape or a lower part reduced cross section is installed on a foundation at a drain gradient, and then variable individual footings made of cement concrete are attached so as to be leaned and locked against the same foundation surface on both sides of the invert to form a water passage bottom. A gate type side ditch body made of cement concrete is mounted on small steps. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention uses a material such as acid-resistant material as necessary only in the water flow section where water is always in contact with road gutters and sewers, etc., and has an appropriate bottom shape and drainage gradient, even when the amount of drainage is small, an appropriate scavenging force In addition to constructing a canal facility with precast concrete, it is possible to install only one type of ordinary cement concrete member under design conditions that do not require corrosion resistance, and to install a free-gradient canal with a material that conforms to the on-site drainage conditions at low cost. At the same time, it relates to a method for speeding up the mechanization of construction.

In recent years, there has been a problem that it is difficult to obtain the service life required for drainage facilities in conventional cement concrete sewer pipes, road gutters, and U-shaped grooves due to the influence of acidic water.
As a corrosion-resistant drainage facility, are pipes made of expensive sulfur concrete, etc., different from cement concrete, U-grooves, and at least the inner surface of the water-flowing part, are these corrosion-resistant concrete linings used as a two-layer structure product with cement concrete? Or by painting after the facility is completed.
And in the free slope side gutter for road drainage, a portal cement concrete side gutter body with an inner width of 30 to 40 cm and an inner height of 30 to 120 cm, with the lower part open and an opening on the top is used, and the bottom part is made of cement ready concrete with a free slope. Therefore, the bottom surface shape is limited to a flat surface only for finishing work from the top surface opening, and an inverted curved surface that is hydraulically advantageous cannot be formed.
On the other hand, even when the bottom part is installed by precast, invert is laid on the foundation according to the drainage gradient, and the concrete is cast on the site corresponding to the height of the gate-type side grooves placed on the independent footings on both sides. Therefore, it is difficult to adapt to the rapid construction by night construction, and the height adjustment by the independent footing itself also changes the foundation surface.

  JP 2000-27277 A   JP 2006-257845 A   JP 2007-204933 A

Of the water channel bottoms installed in advance, only the invert, which is always the inner surface of the water passage, is laid in a free-gradient with corrosion-resistant precast concrete, and the shape of the inner bottom surface can be selected as appropriate, such as a U-shape with a curved surface and reduced width Further, a variable independent footing having a necessary height corresponding to the gate-type side groove to be placed next is additionally provided to complete the entire bottom of the water channel.
In this case, the invert and the variable independent footing are separately fixed on the same base surface, and at the same time, they are integrated with respect to the design load, and are distributed and supported on all the bases.
Then, a gate-type side groove is placed on the bottom of the waterway, and the construction is accelerated by mechanization by constructing the corrosion-resistant free-gradient waterway side groove with only precast concrete.

Pre-cast invert made of corrosion-resistant concrete such as curved surface or U-shaped, and after installing the invert on the foundation with a drainage gradient, the cement concrete variable independent footing of the same height on both sides and the required height is attached in a leaning state. Then, the water channel bottom is formed in advance, or the water channel bottom is formed in advance by using variable independent footings having the same bottom surface on both sides of the invert and having the required height as a joint.
Then, the cement concrete gate-type side gutter body is placed on the bottom of the channel where the mortar is mortared on the inverted both sides independent variable footing, and the free gradient channel side gutter is constructed.
Independent variable footing is supplied at individual heights corresponding to site design conditions.

Only invert is made of corrosion-resistant concrete, the inner bottom is curved and the cross section is reduced in width, making it ideal for drainage conditions, and other parts can be constructed using cement concrete and only precast concrete required for free slope.
In this case, one type of invert can cope with all gradients, and it is possible to perform the entire machine construction from the formation of the water channel bottom by the combination with the variable independent footing manufactured to the required height and the placement of the portal side gutter body. Become.

  Invert and variable independent footing are laid on the foundation, or variable independent footing is connected to both sides of the invert in advance to install the bottom of the waterway with one whole, so there is no need to place concrete base or adjusted concrete in the field Therefore, the construction period is shortened and the construction accuracy is improved.

Inverter and variable independent footing leaning latching part or joint part is not rigidly connected but has a degree of freedom of bending, and the design load from the upper part is also transmitted to invert via variable independent footing at the same time. It is possible to obtain a stable structure that is distributed and supports the entire body evenly.
Furthermore, invert is a simple version with a span within the channel for structural calculations, and is designed for the load on both ends and the uniform distributed reaction force on the foundation surface. Thus, in the case where the inner channel width is 30 cm and the side wall thickness of the gate-type side groove is 6 cm, the span length ratio is advantageous as 30 ÷ 36 = 0.83, and the bending moment stress calculation of 0.125 × (span) ² Is reduced to 30 ² ÷ 36 ² = 0.69, which is far more advantageous than the footing unit integrated structure.

Only the invert at the bottom of the waterway is corrosion resistant concrete and other parts are supplied with cement concrete and precast concrete according to each material, so the whole waterway is formed at low cost.
Furthermore, it is possible to easily and inexpensively obtain a free-gradient double-section waterway side groove in which the width of the low water portion is reduced so that an appropriate scavenging force is maintained even when the drainage flow rate is small.

  It is a notch slope figure which shows the Example of the composite cross-section free-gradient waterway side groove | channel using an invert and a variable independent footing in the bottom part.   It is sectional drawing along the AA line of FIG.   It is a slope view which shows the Example of invert.   It is a perspective view which shows the Example of a variable independent footing.   It is a perspective view which shows the Example of a portal side gutter main body.   It is a notch slope view of the channel bottom part leaning and latching combining variable independent footing on both sides of invert.   It is sectional drawing along the BB line of FIG.   It is a slope view of the water channel bottom part which united the variable independent footing on both sides of invert, and united.   It is sectional drawing along the CC line of FIG.   It is a perspective view of the channel bottom part which integrally formed invert and the variable independent footing base part of both sides.   It is sectional drawing along the DD line of FIG.

The free-gradient waterway side groove uses a gate-type side groove body having several depths of 10 cm, for example, corresponding to the road surface height and the total height of the waterway, and forms the head of the waterway extension to form a design drainage gradient to form a head of the entire waterway extension.
In the present invention, prior to the construction of the entire waterway, a continuous laying of only one type of corrosion-resistant material precast invert is provided on the foundation by the waterway gradient, and the height of the gate-type side groove body is set corresponding to the road surface height and the waterway overall height. Cement concrete variable independent footing is attached to both outer sides of the invert with the same bottom and leaning against each other, or using the invert with variable independent footing of the same height on both sides and the required height in advance. The drainage gradient is laid on the foundation, and the cement-concrete gate-type gutter body is placed on the footing stage.
The bottom surface of the gate-type side gutter body is formed with the entire corrosion-resistant free-gradient water channel in which watertightness is secured by the mortar on the footing step.
The joint of invert and variable independent footing has the same effect as leaning lock, but it can be integrated handling at the time of construction and the minimum bolt connection required for safety, and anticorrosion coating, plating etc. can be selected as necessary After that, it is assumed that the joint part is in close contact with the foundation surface while maintaining the degree of freedom of bending.

Inverts can be curved, V-shaped, and other sections suitable for drainage. In the case of a U-shaped channel cross section, the low water portion is reduced to a multi-section water channel, and a scavenging performance can be obtained even with a small amount of drainage.
Invert is made of, for example, sulfur concrete, which has corrosion resistance, and the inner surface of the water passage has a two-layer structure consisting of a corrosion-resistant layer and cement concrete.
Furthermore, it is based on cement concrete only under design conditions that do not require corrosion resistance.

  The gate-type side groove body has a structure according to Japanese Patent Application Laid-Open Nos. 7-166598 and 9-302758, and when the lower ends of both side walls are flexible and free ends, the inner surface of both side walls and the both side surfaces of Invert are pressed by backfilling soil pressure. It can be further increased.

FIG. 1 shows a construction state of the embodiment, and FIG. 2 shows a cross section along the line AA. (1) is the invert (2) is the variable independent footing (3) is the portal side gutter body (4) is the bottom of the water channel.
The invert (1) is made of corrosion-resistant concrete (7) and has a shape in which the bottom of the water channel is a reduced composite surface as shown in FIG. 3, and overhangs (15) are provided on both sides at positions corresponding to variable independent footings.
The variable independent footing (2) uses cement concrete (8) and the width and variable height required to disperse and transmit the design load to the foundation by placing the gate-type side groove body as shown in FIG. A notch portion (14) is formed on the one side and is in contact with the overhanging portion (15) of the invert to be locked.
The variable height is set to h = h ′ or h ≠ h ′ in increments of 20 mm, for example.
First, the invert (1) is continuously laid on the foundation (13) according to the drainage gradient.
After that, the variable independent footings (2) and (2) on the foundations (13) on both sides are fixedly attached to the same bottom surface along the both sides of the invert (1), and the height of the gate-type side groove main body to be placed is placed. A water channel bottom (4) having small steps (5) and (5) corresponding to the height is formed. In this case, the cut portion (14) of the variable independent footing is leaned and locked to the overhanging portion (15) of the invert.
Then, the side wall (6) (6) of the portal side gutter body (3) is continuously placed to construct a free-gradient water channel. In this case, the mortar (23) or dry mortar is slightly thickened on the stage (5). Install it on the floor.
For level fine adjustment, a liner (22) such as a plastic or iron plate piece is appropriately used as necessary.

  The portal side gutter body (3) in this embodiment uses cement concrete (8), and the upper part is integrated by a plurality of fixed beams (9) as shown in FIGS. A slit (10) serving as an entrance is provided. Further, a lid receiving opening (11) is provided as necessary, and the grating (12) is set.

  FIG. 6 shows the ridges (17) and (17) of the variable independent footings (2) and (2) made of cement concrete (8) on both side ridges (16) and (16) of the invert (1) made of corrosion resistant concrete (7). 7) shows a water channel bottom (4) which is leaned and locked even in combination, and a cross section taken along line B-B is shown in FIG.

Fig. 8 shows variable independent footings (2) (2) made of cement concrete (8) on both sides of the invert (1) having a two-layer structure with cement concrete (8) made of corrosion-resistant concrete (7) only on the inner surface of the water passage. The water channel bottom part (4) united with the articulated joint is shown, and a cross section along the line C-C is shown in FIG.
In this embodiment, there is no locking portion, and only the bolt (21) from the variable independent footing through hole (20) is fastened to the invert embedded insert (19). is there.

FIG. 10 shows an embodiment of the invert (1) in which the bases (18) and (18) which are the minimum height of the variable independent footing made of the corrosion resistant concrete (7) are integrally formed on both sides, and a cross section taken along the line D to D. Is shown in FIG.
In this embodiment, the base (18) is integrated, but the boundary between the invert (1) is reduced by the V-cut (24), and the base (18) is independently variable depending on the design load. Although it works in the same manner as the footing joint, the cross-sectional shape of the V-cut may be an appropriate shape such as a U-shaped square, or may be embedded with plastic or the like.
In addition, as the reinforcing bars arranged at the boundary, anticorrosion coating, anticorrosion plating, and stainless steel can be selected as appropriate.
And, if necessary, concrete board, cement board board, etc. are bonded and raised on the base (18) (not shown) and supplied to individual heights, or they are made into a single-piece product with a raised V-cut. A water channel bottom (4) is formed having an attached step (5).

  As for invert corrosion resistant concrete, for example, sulfur concrete is made by solidifying molten sulfur-containing material at 120 ° C or higher, and the production method is different from cement concrete. In addition to obtaining the corrosion resistance effect of the water channel in a limited manner, it can be supplied at a low cost as a whole because it is of one type and fits all the high cross sections in the water channel.

The gate-type gutter body is usually supplied as a standard product with a depth of 10 cm.
Moreover, it is not limited to the structure which connects the slit part shown in an Example with a fixed beam, It can utilize for the thing according to many uses, such as an integral structure without a slit, or a circular arch type.

The variable independent footing is supplied as precast concrete with the required height for each installation site, but generally it is produced in advance in 2cm height increments that fill the middle of the standard for every 10cm depth of the gate-type side gutter body in 5 steps. It requires a certain stockpile for each height.
As a result, the supply flexibility is increased, and it is versatile and can be diverted. The production loss as precast concrete is negligible because it is much simpler than the invert and gate-type side gutter body.
In addition, a wedge-shaped liner is appropriately used for fine adjustment during construction.

DESCRIPTION OF SYMBOLS 1 Invert 2 Variable independent footing 3 Portal side gutter main body 4 Water channel bottom part 5 Substage 6 Side wall 7 Corrosion-resistant concrete 8 Cement concrete 9 Fixed beam 10 Slit 11 Lid receiving opening 12 Grating 13 Base 14 Cut part 15 Overhang part 16 Concave line 17 Convex Article 18 Base 19 Insert 20 Through-hole 21 Bolt 22 Liner 23 Mortar 24 V-cut

Claims (3)

  On both sides of the invert by the corrosion-resistant concrete laid in the drainage gradient, the bottom of the channel is the same and the bottom of the channel is formed with a variable independent footing made of cement concrete with the required height. Corrosion-resistant free-gradient channel where the gate-type gutter body made of cement concrete is placed between the two.   The corrosion-resistant free-gradient waterway according to claim 1, wherein a variable independent footing base is also integrally formed with V-cuts on both sides of the invert made of corrosion-resistant concrete as a boundary, and the bottom of the waterway is formed as a step by raising the base if necessary.   The free-gradient waterway according to claim 1, wherein invert using cement concrete is used.

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