JP4591769B2 - Precast concrete free-gradient side gutter - Google Patents

Description

  The present invention has an appropriate bottom shape and drainage gradient, and even when the amount of drainage is small, road gutters with an appropriate scavenging force can be constructed using only precast concrete, and at the same time, the drainage of the site can be mechanized. The present invention relates to a method for easily and inexpensively constructing a free-gradient side groove that meets the conditions.

Conventionally, a free-gradient road gutter usually has an inner width of 30 to 40 cm, an inner height of 30 to 120 cm, a lower part is opened, and a portal-type precast concrete gutter body with an opening on the upper surface is used. Although it is constructed with a concrete free slope, the shape of the bottom is limited to a flat shape with a limited trowel finish from the top opening, the curved shape of invert is not possible, and the bottom is precast In some cases, the precast invert was laid on the foundation in accordance with the drainage gradient, and there was a problem that required on-site placement of adjusted concrete corresponding to the height of the gate-type side groove placed on the footings on both sides. .
JP 2000-27277 A JP 2001-123519 A

  The pre-installed free-graded side groove bottom is directly formed on the foundation with a single precast concrete, and the bottom shape is an inverted curved surface, with a composite cross-section with reduced flat and low water width U-shaped water channel shape can be selected as appropriate, and the height of the gate-type side groove mounted on the bottom of the side groove is adjusted by independent footing, and at the same time, only precast concrete with free-gradient side grooves where each member has a locking relationship It is possible to construct by construction, and mechanize construction.

Using a precast invert formed in the shape of a U-shaped channel with a curved surface, flat surface, or both side walls, the invert is laid on the foundation in a drainage gradient, and on the foot on the footing attached to the required height on both sides Stops projecting on the footing, in which a gate-type side groove is placed, and in this case, play occurs in the gap between the footing and the invert side wall surface, and the invert positioning has a slight degree of freedom of about 5 mm from side to side. Competing for the inclined surfaces of the two sides to be inscribed in the side walls of the gate-type side grooves, a balanced locking combination between the members is formed.
The same is true if the gate-type side groove side walls are provided with locking inclined surfaces.
And lay mortar on the steps on the invert side footings, and construct the free-gradient side groove by placing the gate-type side groove body on the bottom of the side groove installed in this way so that it is sandwiched between both side walls It is.

  Since invert and footing are laid on the foundation, it is not necessary to place concrete base on-site and the construction period is shortened.

  The design load on the upper surface of the side groove is distributed through independent footing, and a stable structure can be obtained in which the foundation is evenly supported.

It can be constructed using a precast concrete with a free-gradient surface that is optimal for drainage conditions such as a curved bottom, a flat bottom, and a reduced cross section at the bottom.
In this case, one type of invert and footing can correspond to all gradients, and the entire machine construction is possible.

  Furthermore, it is possible to easily and inexpensively obtain a free-gradient double-section 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.

Usually, a gate-type side groove body with a depth of 1 to several types, for example, in 10 cm increments, is used to form the drop of the entire side groove extension, but a precast invert is installed in accordance with the upper surface of the foundation prior to the installation of the entire side groove. To do.
After that, the foundations on both the outer sides are adjusted to the required height, and the footings are attached to both the outer sides of the invert so as to be in close contact with each other to the height corresponding to the portal side groove body to be placed without being restrained by the channel gradient. The gate-type side groove main body is placed with the stoppers protruding from both footings interposed therebetween, but the bottom of the gate-type side groove main body is a side groove in which watertightness is secured while securing the mutual engagement of each member by the mortar on the footing. The whole is formed.

  Moreover, when using a channel-shaped U-shaped invert, it is possible to obtain a multi-section side groove in which the low water portion is reduced.

  In addition, when the portal side gutter main body has a structure according to Japanese Patent Laid-Open Nos. 7-166598 and 9-302758, and the lower end of both side walls is a flexible free end, the inner surface of both side walls and both footings are It is possible to further increase the pressure bonding between the stopper and both side surfaces of the invert.

FIG. 1 shows a construction state of the embodiment, and FIG. 2 shows a cross section along the line AA. (1) is U-shaped invert (2), footing (4) is side groove bottom (3) is a portal side groove body.
As shown in FIG. 3, the U-shaped invert (1) has a shape in which the bottom of the side groove has a reduced double section, and both sides have recesses (15) at positions corresponding to the footings.
As shown in FIG. 4, the footing (2) has a width and thickness necessary to disperse and transmit the design load on the foundation by placing the gate-type side groove main body, and a stopper (14) accommodated in an invert recess on one side The required number is formed, and a locking inclined surface with the gate-type side groove body is provided.
First, a U-shaped invert (1) is laid on the foundation (13) according to the drainage gradient.
After that, a gate-type side groove in which the foundations (13) and (13) on both sides are formed and the footings (2) and (2) are mounted on the U-shaped inverts (1) in close contact with each other and placed. The steps (5) and (5) are provided in accordance with the height of the main body to form the side groove bottom (4).
In this case, the footing stopper (14) is accommodated in the concave portion (15) of the U-shaped invert, and at the same time, the stopper (14) substantially coincides with the outer surface of the U-shaped invert or the side wall (6) (6 ) Is provided at a position where it can be inscribed.
Then, the side wall (6) (6) of the portal side groove main body (3) is externally placed on the stopper (14) (14) and continuously placed to construct a free-gradient side groove. Lay the mortar (8) or dry mortar slightly thick and install it.
For the level adjustment, a liner (7) such as plastic or an iron plate piece is appropriately used.

The portal side gutter body (3) of this embodiment is integrated with a plurality of fixed beams (9) as shown in FIGS. 1, 2 and 5, and is provided with a slit (10) serving as an inlet for rainwater or the like. It has been.
Further, a lid receiving opening (11) is provided as necessary, and the grating (12) is set.

  The outer surface of the U-shaped invert does not have a recess or is continuous with the entire length, and the footing stopper is also continuously connected with the U-shaped invert continuously with the entire length, and at the same time, it can be configured by engaging each part with the portal side groove. is there.

  Furthermore, it is possible to provide an appropriate structure depending on the use, such as providing an opening in the invert to make it underground.

  The stopper provided on the footing may be attached with another material by bonding, screws, or the like, or may be omitted depending on design conditions.

Each member can be produced within the scope of the prior art and supplied at low cost.
In addition, the gate-type side groove body is not limited to the structure in which the slit portion shown in the embodiment is connected by a fixed beam, but also includes an integrated structure without a slit, and the U-shaped invert has a deep U-shaped side groove, and the gate-type side groove body has a flange. It can be used for various purposes, such as a U-shaped free-gradient culvert side gutter with a top plate.

  It is a notch slope figure which shows the Example of the composite cross-section free-gradient side groove | channel using a U-shaped invert and footing in the bottom part.   It is sectional drawing along the AA line of FIG.   It is a slope view showing an example of precast U-shaped invert.   It is a perspective view which shows the Example of footing.   It is a perspective view which shows the Example of a portal side gutter main body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 U-shaped invert 2 Footing 3 Portal side groove main body 4 Side groove bottom part 5 Small step 6 Side wall 7 Liner 8 Mortar 9 Fixed beam 10 Slit 11 Cover receiving opening part 12 Grating 13 Base 14 Stopper 15 Recessed part

Claims (2)

  A free-gradient side gutter construction method in which footings are attached to the required height on both sides of the U-shaped invert laid in the drainage gradient, and the portal side gutter body is placed on the small steps so as to be externally locked to the footing stopper. After laying the invert on the foundation according to the drainage gradient and adjusting the foundations on both sides to the required height, the invert of the invert so that the stopper is almost inscribed and locked to the side wall of the gate-type side groove body placed on the stage Footing that is attached to both sides to form the bottom of the side groove in the appropriate bottom shape and drainage gradient.

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