JP6126415B2 - Co-grooving method for side grooves - Google Patents

Description

  The present invention relates to a method of forming a side groove in a common groove for adding a function as a common wire groove for storing cables together to a plurality of existing side grooves.

By burying various cables such as distribution lines, telephone lines and optical fibers in the ground, securing emergency transport roads in the event of a disaster, smooth firefighting activities, creating a strong city in times of disaster such as typhoons and earthquakes, and advanced information For example, it is possible to stably supply power to the mobile phone and improve communication reliability.
Therefore, especially in urban areas, in order to form a functional road space and realize a beautiful cityscape, the cables are stored together in a common cable groove (C, C, BOX) embedded in the sidewalk. It is being promoted to make it non-electric pole.

The electric wire common groove is preferably installed along the public-private boundary portion of the sidewalk in order to shorten the cable drawing distance to the house as much as possible.
However, there are many side gutter blocks that allow rainwater from roads and houses to flow into the sewage at the public-private boundary of the sidewalk. May overlap.

Therefore, the applicant of the present invention is to add a function as an electric wire common groove capable of storing cables together for a side groove for drainage after construction (hereinafter, also referred to as “drainage side groove”). A joint groove construction method for drainage side grooves has already been proposed (see Patent Document 1).
One of the joint groove forming methods described in Patent Document 1 is that a support member is attached in advance to the left and right side surfaces in an existing side groove, cables are stored in the bottom portion in the side groove, and then the bottom plate member is attached. It is characterized in that a new drainage channel is formed in the upper part of the side groove on the support member.

  According to this joint grooving method, the internal cross section of the drainage side groove is formed into a joint groove with an upper and lower two-stage structure in which the upper side is a drainage channel and the lower side is a storage space for cables, etc. There is an effect that maintenance work such as cleaning of the newly formed drainage channel becomes easy.

JP 2012-136893 A

The conventional co-grooving method is a method of retrofitting a bottom plate member in the middle of the vertical direction of an existing gutter and using the upper space in the gutter as a drainage channel, for example, several years after the completion of construction, There is also an advantage that the cable can be added or replaced by removing the bottom plate member.
On the other hand, in order to ensure the water tightness of the upper space serving as a drainage channel, the width between the width direction end of the bottom plate member and the support member, and the connection ends adjacent to each other in the drainage direction, for example, dry-type with butyl rubber or the like However, there was a problem that the construction was complicated in this respect.

  In view of the conventional problems described above, the present invention simplifies the construction so that the watertightness of the drainage space newly formed in the side groove can be easily ensured when implementing the common groove formation on the existing drainage side groove. It aims to plan.

(1) The first aspect of the present invention is a joint groove forming method for an existing side groove, and includes the following steps (a1) to (c1).
(A1) The step of storing the protective tube of the cable in the side groove (b1) The uncured concrete is filled with the uncured concrete at a level lower than the groove height of the side groove. A step of filling (c1) a step of forming a groove base made of hardened concrete containing the protective tube and a drainage space located above the groove base by waiting for the uncured concrete to harden

According to the first aspect of the present invention, a foundation in a groove made of hardened concrete, in which uncured concrete is filled in the side groove at a level lower than the groove height of the side groove, and a protective tube is contained therein, and the foundation in the groove Since the drainage space located above is formed, the watertightness of the drainage space can be ensured without performing dry water stop treatment at the time of construction.
Therefore, the water tightness of the drainage space newly formed in the side groove can be easily ensured, and the construction can be simplified.

(2) A second aspect of the present invention is a joint groove forming method for an existing side groove, and includes the following steps (a2) to (c2).
(A2) A step of storing a cable protection tube in the side groove (b2) The base material is filled in that order with a foundation material and uncured concrete in that order at a level lower than the groove height of the side groove. And (c2) waiting for the uncured concrete to cure, waiting for the uncured concrete to harden, the foundation in the groove comprising the protective material and the hardened concrete, and the foundation in the groove Forming a drainage space located above the section

According to the second aspect of the present invention, the foundation material and the uncured concrete are filled in the side groove at a level lower than the groove height of the side groove, and the foundation material in the groove made of the foundation material including the protective tube and the cured concrete is provided. Since the drainage space located above the foundation in the groove is formed, the watertightness of the drainage space can be ensured without performing a dry water stop treatment at the time of construction.
Therefore, the water tightness of the drainage space newly formed in the side groove can be easily ensured, and the construction can be simplified.

(3) In the first or second aspect of the present invention, the step (b1) or the step (b2) preferably includes an operation of forming the upper surface of the uncured concrete into a desired water conveyance gradient.
If this work is performed, the upper surface of the foundation in the groove can be adjusted to a desired water conveyance gradient, so that the drainage space after construction can be used as it is as a drainage channel with the upper surface of the foundation in the groove as the bottom. Become. Moreover, in this case, there is also an advantage that the newly formed drainage space can be constructed in a water conveyance gradient different from that of the existing gutter.

(4) In the first or second aspect of the present invention, the step (c1) or the step (c2) may include a step of storing a precast water channel member in the drainage space.
If this operation is performed, the inside of the water channel member housed in the drainage space can be used as the drainage channel.

(5) By the way, some protective tubes for cables have a specific gravity smaller than that of uncured concrete, such as a flexible tube made of resin. In the case of such a protective tube, when the uncured concrete is filled in the side groove, it floats up and may not be installed at a predetermined height in the side groove.
In addition, when filling a protective tube with a base material (for example, crushed stone or gravel), the plane position of the protective tube is shifted by the pressure received from the basic material put into the side groove, and the protective tube is moved to a predetermined position in the side groove. There is a possibility that it cannot be installed.

Therefore, in the first or second aspect of the present invention, the step (a1) or the step (a2) includes an operation of fixing an appropriate position in the longitudinal direction of the protective tube housed in the side groove to the side groove by a fixing member. It is preferable to include.
If this work is performed, when the protective tube is filled with unhardened concrete or foundation material, the protective tube can be prevented from rising and the plane position being shifted, and the protective tube can be placed in an appropriate position in the side groove. Can be installed.

(6) In the first or second aspect of the present invention, when the step (a1) or the step (a2) includes an operation of housing a plurality of the protective tubes in the side groove, the fixing member It is preferable to have a function of positioning the plurality of protection tubes so that the cross-sections of the plurality of protection tubes are arranged vertically and horizontally in the side groove.
If such a fixing member is employed, the plurality of protective pipes can be regularly laid in the side groove without crossing each other, and the laying work when the plurality of protective pipes are provided can be appropriately performed.

(7) After the construction of the joint grooving method according to the first or second aspect of the present invention, a protective tube is buried inside the groove base constructed in the side groove.
Therefore, when the foundations in the groove are constructed in all the side grooves included in the target section of the joint groove, a new hand hole part for maintenance of the cable to be laid inside the protective tube is established. Must be installed at a position offset in the road width direction with respect to the existing gutter.

However, if the hand hole part is newly installed at the position offset in the road width direction of the side groove as described above, the material cost increases and the offset is made in the road width direction as much as the hand hole part is newly installed. The construction cost for excavating and backfilling the road increases as much as the hand hole portion is buried at the position.
Therefore, in the first or second aspect of the present invention, it is preferable to further include the following steps (x) to (y).

(X) a step of forming an opening for drawing a cable in a side wall of one or more of the side grooves included in the target section requiring joint groove formation (y) inside the side groove in which the opening is formed; A step of fixing a pair of damming plates arranged at positions sandwiching the opening from both sides in the longitudinal direction, and forming a portion surrounded by the pair of damming plates inside the side groove as a cable maintenance space

If the above steps (x) and (y) are performed, the portion surrounded by the pair of damming plates inside the side groove becomes the cable maintenance space, and therefore, of the existing side grooves included in the target section, A part can be reused as a handhole part.
As a result, material costs can be reduced by the amount that eliminates the need for a new handhole part, and road excavation and backfilling are required when the new handhole part is embedded in a position offset in the road width direction. Is unnecessary, and the construction cost can be reduced.

(8) In the first or second aspect of the present invention, the pair of damming plates preferably have the same height as the cross-sectional height of the groove base.
In this case, if the maintenance space is detachably closed by the middle lid member and the bottom surface of the drainage space is formed by the upper surface of the middle lid member, the drainage space is not divided by the maintenance space. For this reason, it is not necessary to separately construct a side ditch or a drainage tank for draining around the maintenance space, and the construction cost can be reduced.

(9) However, the pair of damming plates employs a structure having the same height as the groove height of the side groove, and adopts a structure in which the maintenance space is detachably closed by a lid member of the side groove. May be.
In this case, since the drainage space is divided by the maintenance space, it is necessary to separately construct a side ditch and a drainage basin for draining around the maintenance space. Has the advantage of easy access to the cable.

  As described above, according to the joint grooving method of the present invention, it is possible to easily secure the water tightness of the drainage space newly formed in the side groove when implementing the joint groove formation on the existing drainage side groove. Can be achieved.

It is explanatory drawing which shows the construction procedure of the common groove forming method (1st method) which concerns on 1st Embodiment. It is explanatory drawing which shows the construction procedure of the joint groove formation method (2nd construction method) which concerns on 2nd Embodiment. It is a front view which decomposes | disassembles and shows an example of a fixing member. (A) is explanatory drawing which shows the procedure of the fixing operation | work of a protective tube using the fixing member of FIG. 3, (b) is a side view which shows the fixed state of a protective tube, (c) is protection It is a top view which shows the fixed state of a pipe | tube. (A) is a front view which shows the fixed state of a protective tube in the case where the upper surface of the foundation part in a groove | channel is a level lower than a fixed frame, (b) is the side surface which shows the fixed state of the protective tube in that case FIG. Further, (c) is a front view showing a modification of the fixing means of the fixed frame. (A) is a perspective view which shows the modification of a fixing member, (b) is explanatory drawing which shows the procedure of the fixing operation | work of the protective tube using the fixing member. It is explanatory drawing which shows the construction procedure of the 1st construction method in the case of constructing a waterway member additionally in drainage space. (A) is sectional drawing of the channel member of the standard cross section when not raising the pavement, (b) is sectional drawing of the channel member of the irregular cross section when raising the pavement. It is a road top view which shows an example of the object area which performs common groove formation. It is explanatory drawing which shows the construction procedure which changes the function of the existing gutter to a handhole part. It is explanatory drawing which shows another construction procedure which changes the function of the existing gutter to a handhole part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In each of the following embodiments, the cable inserted into the protective tube 7 housed in the existing drainage side groove (hereinafter also simply referred to as “side groove”) 1 includes the lifeline of the residents of the house. Various types of cables (for example, low-voltage or high-voltage power lines, communication lines such as telephone lines or optical fibers) 7A are included.

In the case where there is a margin in the inner cross section of the protective tube 7 accommodated in the side groove 1, water and sewage piping and gas piping can be included as the cable 7 </ b> A inserted through the protective tube 7. That is, the “cable” in this specification is used in a broad sense including those pipes.
Further, a plurality of protective tubes 7 are provided in the side groove 1 for each application, and a single cable or a plurality of cables 7 </ b> A corresponding to each application are inserted into the protective tube 7. Good.

In each embodiment of the present invention, the existing drainage side groove 1 in which the protective tube 7 of the cable 7A is accommodated is continuous in the longitudinal direction at the end portion in the width direction of the road (for example, a position coincident with or close to the public-private boundary line). Are assumed to be installed.
The reason is that a pipe (for example, a combined sewage pipe) is already embedded in the central portion in the width direction of the road, but such an existing pipe can be obtained by storing the protective pipe 7 in the side groove 1. If there is no possibility of interfering with the road and the side groove 1 is close to the public-private boundary, the pull-in distance to the private side of the cable 7A inserted through the protective tube 7 in the side groove 1 can be made as short as possible. It is.

In each embodiment of the present invention, in the existing gutter 1, not only the cable 7A was not supposed to be stored at the time of construction, but it was also possible to store the cable 7A from the time of construction. The case where it is used only for drainage is included.
Thus, the reason why the side groove 1 capable of storing the cable 7A may be used only for drainage purposes is that, in the case of the common wire groove construction, it takes a lot of time to adjust the opinions with the local residents. Therefore, there is a case where the undergrounding of the cable 7A is examined or decided after the drainage is first prepared.

  In each embodiment of the present invention, the existing gutter 1 is not only one that is constructed by continuously connecting gutter blocks made of precast concrete by factory production along the direction of drainage, but also a mold constructed at the construction site. This includes the case of on-site casting constructed by placing uncured concrete on the frame.

Further, the “existing” side groove 1 referred to in the present specification means the side groove 1 in which the burying work has already been completed.
Accordingly, the existing side groove 1 includes the old side groove 1 once used as a drainage side groove after the completion of construction, and of course, after the new side groove 1 has been buried, The case where it is used as a drainage side groove after the construction of the joint groove construction method according to each embodiment of the present invention is used without being used as a drainage side groove.

[First Embodiment]
FIG. 1 is an explanatory diagram showing a construction procedure of the joint groove forming method according to the first embodiment.
In the joint groove forming method (hereinafter referred to as “first method”) in FIG. 1, the protective tube 7 is housed in the main body portion (hereinafter referred to as “side groove main body”) 2 excluding the lid member 3 of the existing side groove 1. In this state, a new drainage space (drainage channel) 12 is formed in the upper part of the inner cross section of the side groove main body 2 by placing the uncured concrete 8 and constructing the foundation part 11 in the groove. Hereinafter, the contents of the first construction method will be described with reference to FIG.

FIG. 1A is a cross-sectional view of the existing side groove 1. The side groove 1 has a concrete side groove main body 2 having an open channel cross section and a lid member 3 (a concrete lid or a grating lid) that closes the upper opening.
The side groove main body 2 is made of precast concrete or hard-cast concrete cast in the field, and integrally includes left and right side wall portions 4 and 4 and a bottom wall portion 5 that connects lower end portions thereof, and has an open top. It consists of a substantially U-shaped structure.

First, the lid member 3 is removed from the upper end opening of the side groove body 2 and the inside of the groove of the side groove body 2 is cleaned, so that the bottom wall portion of the side groove body 2 is shown in FIG. 5 is exposed.
In addition, when the existing gutter 1 has never been used for drainage and is a new gutter 1 that has just been buried, the above cleaning process may be unnecessary.

Next, as shown in FIG. 1C, a plurality of protective tubes 7 (four in the illustrated example) for the cable 7 </ b> A are stacked and stored on the bottom of the gutter body 2.
In the case of the side groove 1 in the straight section, the protective tube 7 may be a non-flexible steel pipe, but if considering the ease of laying work in the side groove main body 2, It is preferable to use a flexible tube made of a resin that is lightweight and flexible. Further, the cross-sectional shape of the protective tube 7 is not limited to the circular shape shown in the figure, and may be other shapes such as a rectangular shape.

  When the storing operation of the protective tube 7 is completed, a predetermined amount of uncured concrete 8 is placed in the side groove main body 2 until a predetermined level lower than the groove height of the side groove main body 2 is reached, as shown in FIG. Then, the uncured concrete 8 is filled in the bottom portion of the side groove main body 2, whereby the plurality of protective tubes 7 are buried in the uncured concrete 8.

Thereafter, by curing the uncured concrete 8 and waiting for its curing, as shown in FIG. 1 (d), the base portion 11 in the groove made of the hardened concrete 9 in which the plurality of protective tubes 7 are included in the cross section is formed as a side groove. Constructed on the lower side of the main body 2, a new drainage space 12 is formed on the upper side of the inner space of the side groove main body 2, with the upper surface of the in-groove foundation 11 serving as the bottom surface.
Then, by closing the upper open portion of the side groove main body 2 with the lid member 3, the cross-section closing for the existing side groove 1 is completed.

After that, for example, the cable 7A may be laid along the drain direction of the side groove 1 by inserting the cable 7A from the hand hole portion 41 (see FIGS. 9 to 11) into the protective tube 7.
However, in the laying operation of the cable 7A, in the state before placing the uncured concrete 8 (the state shown in FIG. 1 (c)), the operation of inserting the cable 7A into the protective tube 7 that is not yet embedded in the concrete. It may be included.

Thus, according to the first construction method, the foundation portion in the groove made of the hardened concrete 9 filled with the uncured concrete 8 in the side groove 1 at a level lower than the groove height of the side groove 1 and including the protective tube 7 therein. 11 and the drainage space 12 located above the foundation part 11 in the groove, the watertightness of the drainage space 12 can be ensured without performing a dry water stop treatment at the time of construction.
Therefore, the water tightness of the drainage space 12 newly formed in the side groove 1 can be easily secured, and the construction can be simplified.

Moreover, according to the 1st construction method, the cross-sectional height of the foundation part 11 in a groove | channel can be adjusted arbitrarily according to the amount of placement of the unhardened concrete 8 cast in the side groove | channel 1 on-site.
For this reason, for example, in the step of placing the uncured concrete 8 shown in FIG. 1C, the drainage space after the construction is performed by forming the upper surface of the placed uncured concrete 8 into a desired water guide gradient. 12 can be used as it is as a drainage channel having the upper surface of the in-groove foundation 11 as the bottom surface, and there is an advantage that a drainage space (drainage channel) 12 having a different water guiding gradient from the existing side channel 1 can be formed.

[Second Embodiment]
FIG. 2 is an explanatory view showing a construction procedure of the joint groove forming method according to the second embodiment.
The joint groove forming method (hereinafter referred to as “second method”) in FIG. 2 is a state in which the protective tube 7 is housed in the side groove main body 2 of the existing side groove 1 and the base material 10 is put in before uncured concrete 8. Is constructed to form a new drainage space (drainage channel) 12 at the upper part of the inner cross section of the side groove body 2. Hereinafter, the content of the second construction method will be described with reference to FIG.

Also in the second construction method, the lid member 3 is first removed from the upper end opening of the existing side groove main body 2 shown in FIG. 2A, and the inside of the groove of the side groove main body 2 is cleaned. ), The bottom wall portion 5 of the gutter body 2 is exposed.
Even in the second construction method, when the existing gutter 1 has never been used for drainage and is a new gutter 1 that has just been buried, the above cleaning process may be unnecessary. is there.

  Next, as shown in FIG. 2 (c), a plurality of protective tubes 7 (four in the illustrated example) for the cable 7 </ b> A are stacked and stored on the bottom of the side groove body 2. In the case of the second embodiment, the protective tube 7 may be a steel tube or a flexible tube.

When the storing operation of the protective tube 7 is completed, as shown in FIG. 2 (c), a predetermined amount of the base material 10 made of crushed stone or gravel is put into the gutter body 2 and compacted, whereby a plurality of protections are provided. The tube 7 is buried in the base material 10.
Thereafter, uncured concrete 8 is placed on the compacted base material 10 to form a concrete layer on the top of the base material 10.

Thereafter, by curing the uncured concrete 8 and waiting for its curing, a foundation in a groove comprising a base material 10 in which a plurality of protective pipes 7 are included in the cross section and a cured concrete 9 as shown in FIG. The part 11 is constructed on the lower side of the side groove main body 2, whereby a new drainage space 12 is formed on the upper side of the internal space of the side groove main body 2, with the upper surface of the in-groove base portion 11 being the bottom surface.
Then, by closing the upper open portion of the side groove main body 2 with the lid member 3, the cross-section closing for the existing side groove 1 is completed.

After that, for example, the cable 7A may be laid along the drain direction of the side groove 1 by inserting the cable 7A from the hand hole portion 41 (see FIGS. 9 to 11) into the protective tube 7.
However, the cable 7A is laid through the protective tube 7 that is not yet embedded in the base material 10 in the state before the base material 10 is introduced (the state shown in FIG. 2C). Work may be included.

The difference between the first construction method and the second construction method is that, in the first construction method of FIG. 1, the foundation 11 in the groove is composed of only hardened concrete 9, whereas in the second construction method of FIG. The portion 11 is composed of the base material 10 and the hardened concrete 9 thereon.
For this reason, the technical feature of constructing a groove base portion 11 at the lower part of the side groove body 2 so as to include the protective tube 7 housed in the groove and making the upper space of the groove base portion 11 the drainage space 12 is as follows. Both methods are common. Therefore, the second method has the same effects as the first method.

That is, according to the second construction method, the base material 10 and the uncured concrete 8 are filled in the side groove 1 at a level lower than the groove height of the side groove 1, and the base material 10 and the hardened concrete 9 including the protective tube 7 therein. Since the groove base 11 and the drainage space 12 located above the groove base 11 are formed, the watertightness of the drainage space 12 is ensured without performing a dry water stop treatment at the time of construction. can do.
Therefore, the water tightness of the drainage space 12 newly formed in the side groove 1 can be easily secured, and the construction can be simplified.

Also in the second construction method, the cross-sectional height of the in-groove foundation 11 is arbitrarily adjusted according to the amount of the foundation material 10 to be introduced into the side groove 1 and the amount of uncured concrete 8 to be cast on-site. can do.
For this reason, for example, in the step of introducing the base material 10 and placing the uncured concrete 8 shown in FIG. The drainage space 12 after the construction can be used as it is as a drainage channel with the upper surface of the base portion 11 in the groove as the bottom surface, and there is an advantage that a drainage space (drainage channel) 12 having a diversion gradient different from that of the existing side groove 1 can be formed. is there.

In addition, in the example of the 2nd construction method shown in FIG. 2, the cross-sectional structure when the cross-sectional height of the base material 10 is set to the height which can embed all the protective pipes 7, and the hardened concrete 9 on it is comparatively thin The base part 11 in the groove was illustrated.
However, the layer thickness of the in-groove foundation portion 11 is not limited to the above, and the depth of the foundation material 10 is increased to such an extent that the hardened concrete 9 covers or partially covers the upper protection tube 7. You may decide to make small and to set the layer thickness of the hardened concrete 9 large.

[Protection tube fixing work]
Of the protective pipes 7 that can be adopted in the joint groove forming method of each of the above-described embodiments, the resin-made flexible pipe has an extremely small specific gravity compared to the uncured concrete 8.
Therefore, in the step of placing the uncured concrete 8 shown in FIG. 1C, when the uncured concrete 8 is filled into the side groove 1, the protective tube 7 is lifted, and the protective tube 7 is brought to a predetermined height in the side groove 1. It is assumed that it cannot be installed.

2B, the planar position of the protective tube 7 is shifted by the pressure received from the basic material 10 put into the side groove 1, and the protective tube 7 is moved to a predetermined position in the side groove 1. This phenomenon may occur even in steel pipes.
Therefore, the protection housed in the gutter body 2 in the placing process of the uncured concrete 8 in the first construction method (FIG. 1C) and the loading process of the base material 10 in the second construction method (FIG. 2C). It is recommended that the pipe 7 is fixed at the appropriate position in the longitudinal direction to the gutter body 2 with a fixing member.

FIG. 3 is an exploded front view showing an example of the fixing member 20 used for fixing the protective tube 7.
The fixing member 20 shown in FIG. 3 includes a lower pressing tool 21, an upper pressing tool 22, and a fixing frame 23 that penetrates these pressing tools 21 and 22 from above.
The fixed frame 23 integrally includes a horizontal beam portion 24 extending in the horizontal direction, a side bar 25 extending vertically downward from both ends of the horizontal beam portion 24, and a center bar 26 extending vertically downward from the center portion of the horizontal beam portion 24.

Each part of the fixing member 20 is made of a rod-like member that can be elastically deformed by human power, such as hard plastic or spring steel.
The lower presser 21 is made of a flat block body made of resin or metal, and has a pair of left and right recesses on the lower surface side that match the outer peripheral surface of the protective tube 7. In addition, the presser 21 has an insertion hole 21A through which the center bar 26 penetrates in the vertical direction at the center.

The upper-stage presser 22 is made of a flat block body made of resin or metal, and has a pair of left and right recesses on the lower surface side that match the outer peripheral surface of the protective tube 7. Further, the pressing tool 22 has an insertion hole 22A through which the center bar 26 penetrates in the vertical direction in the center portion, and a fitting groove 22B extending in the left-right direction in which the horizontal beam portion 24 just fits in the upper surface side.
The length in the longitudinal direction of each presser 21, 22 (the length in the left-right direction in FIG. 3) is slightly smaller than the distance between the pair of side bars 25, 25.

FIG. 4A is an explanatory diagram showing a procedure for fixing the protective tube 7 using the fixing member 20 of FIG. 4B is a side view showing a fixed state of the protective tube 7, and FIG. 4C is a plan view showing the fixed state of the protective tube 7. As shown in FIG.
As shown in FIG. 4A, in order to fix the plurality of protective tubes 7 to the side groove main body 2 using the fixing member 20 of FIG. 3, first, the inner surfaces of the left and right side wall portions 4 and 4 of the side groove main body 2 are fixed. Engagement holes 27 into which the end portions of the cross beam portions 24 can be fitted are formed at substantially the same height. In addition, you may form this engagement hole 27 in the side wall parts 4 and 4 of the side groove | channel main body 2 as a secondary product previously.

After that, the protective tube 7 and the pressers 21 and 22 are alternately installed in the order of installation of the first-stage protective tube 7 → installation of the presser 21 → installation of the second-stage protective tube 7 → installation of the presser 22. To do.
When the pressers 21 and 22 are installed, the recesses on the lower surface side are brought into contact with the outer peripheral surface of the protective tube 7 so that the distance between the left and right protective tubes 7 and 7 is substantially matched.
Next, as shown in FIG. 4C, the fixed frame 23 is dropped into the side groove main body 2 while the center bar 26 is inserted into the insertion holes 21 </ b> A and 22 </ b> A of the pressers 21 and 22.

Then, each end portion of the cross beam portion 24 of the fixed frame 23 is fitted into the engagement holes 27 formed in the side wall portions 4 and 4 so that the fixed frame 23 cannot move in the vertical direction.
At this time, the horizontal beam portion 24 of the fixed frame 23 presses the upper pressing member 22 downward, so that the plurality of protective tubes 7 arranged in the vertical and horizontal directions cannot move upward, and the pressing members 21, It becomes impossible to move in the horizontal direction due to the fitting of the recess 22.

As described above, the fixing member 20 illustrated in FIG. 3 positions each of the plurality of protection tubes 7 so that the cross sections of the plurality of protection tubes 7 (four in the illustrated example) are arranged vertically and horizontally inside the lateral groove body 2. It has a function.
For this reason, if such a fixing member 20 is employed, even in the case of the protective tube 7 made of, for example, a flexible tube, the protective tube 7 can be regularly laid inside the side groove body 2 without crossing, and a plurality of protective tubes can be protected. The laying operation when the tube 7 is stored in the side groove 1 can be appropriately performed.

In addition, although the pitch of the longitudinal direction (drainage direction) of the fixing position of the protection tube 7 changes with whether the protection tube 7 is a flexible tube, in the case of a flexible tube, it is 1.0-2.0 m. Should be set.
For this reason, when adopting an inflexible tube member such as a steel tube, it is sufficient to fix the protective tube 7 to the side groove body 2 at a larger pitch.

FIG. 5A is a front view showing a state in which the protective tube 7 is fixed when the upper surface of the in-groove base portion 11 is at a lower level than the fixed frame 23. Moreover, FIG.5 (b) is a side view which shows the fixed state of the protective tube 7 in that case.
In the example of FIG. 5, the height of the upper surface of the in-groove base portion 11 (the bottom surface of the drainage space 12) is from the height of the fixed frame 23 to a height slightly higher than the upper end of the first-stage protective tube 7. The case where it sets to the range (DELTA) H is illustrated.

When the upper surface of the in-groove base portion 11 is set to the above height range ΔH, as shown in FIG. 5, a fixed frame 23 having a middle beam portion 28 at the substantially central portion in the vertical direction is adopted. What is necessary is just to set so that the pressing tool 21 covered on the 1st-stage | paragraph protective tube 7 may be pressed from the top by the part 28. FIG.
Further, in this case, the fixed frame 23 protrudes above the upper surface of the in-groove base portion 11, and the protruding portion may be cut and removed after the uncured concrete 8 is cured. .

As a means for fixing the fixing frame 23 to the side groove main body 2, not only means for fitting both ends of the cross beam portion 24 into the engagement holes 27 formed in the side wall portion 4, but also, for example, as shown in FIG. Various other fixing means such as means for pressing both ends of the cross beam part 24 by the protrusion 24A fixed to the side wall part 4 by an anchor can be employed.
The projections 24A may be attached to the side groove body 2 by retrofitting or may be integrally formed with the side groove body 2 from the beginning.

[Modification of fixing member]
FIG. 6A is a perspective view showing a modified example of the fixing member 30, and FIG. 6B is an explanatory view showing a procedure for fixing the protective tube 7 using the fixing member 30.
As shown in FIG. 6A, the fixing member 30 according to this modification includes a pressing plate 31 having a bolt insertion hole in the center and an elastic plate 32 extending downward from the lower surface of the pressing plate 31.

The elastic plate 32 is composed of a pair of left and right bent plate members 33, 33 having upper ends fixed to the lower surface of the pressing plate 31, and the lower ends of these bent plate members 33, 33 are integrally connected.
Further, each of the bent plate members 33, 33 is formed in a mountain fold bent portion disposed in the central portion in the vertical direction which is a mountain fold when viewed from the outside, and a portion separated vertically from the mountain fold bent portion, Valley fold bent portions that are valley folds as viewed from the outside are formed.

For this reason, when the elastic plate 32 is forcibly deformed so that the lower end portion of the elastic plate 32 approaches the pressing plate 31, the bent plate members 33, 33 are formed so that the mountain fold bent portion protrudes on both sides in the left-right direction. Elastically deforms.
Although not shown in FIG. 6, bolt insertion holes are also formed in the lower end portion of the elastic plate 32 (the plate-like portion connecting the lower ends of the left and right bent plate members 33, 33).

As shown in FIG. 6B, in order to fix the plurality of protective tubes 7 to the side groove body 2 using the fixing member 30, first, bolts are placed at the center of the bottom surface of the bottom wall portion 5 of the side groove body 2. An anchor member 34 having a female screw portion corresponding to the male screw portion is driven. The anchor member 34 may be driven in advance into the bottom wall portion 5 of the side groove main body 2 as a secondary product.
After that, in the order of installation of the first-stage protection tube 7 → installation of the second-stage protection tube 7, the plurality of protection tubes 7 are accommodated inside the gutter body 2, and the fixing member is inserted between the left and right protection tubes 7. The lower end of 30 is inserted.

Next, the fastening bolt 35 is inserted into the bolt insertion hole of the pressing plate 31, and the lower end of the bolt 35 is screwed into the anchor member 34, so that the pressing plate 31 is fixed until it comes into contact with the upper protection tube 7. The vertical dimension of the member 30 is reduced.
Then, the pressing plate 31 presses the upper protection tube 7 downward, and the upper and lower protection tubes 7 are formed by the bent plate members 33 and 33 of the elastic plate 32 expanded in the width direction in accordance with the reduction. Is pressed against the inner surface of the side wall portion 4, and the plurality of protective tubes 7 arranged in the vertical and horizontal directions cannot move in the upward or horizontal direction.

As described above, the fixing member 30 illustrated in FIG. 6 also positions the plurality of protection tubes 7 so that the cross-sections of the plurality of protection tubes 7 (four in the illustrated example) are aligned vertically and horizontally inside the lateral groove body 2. It has a function.
Therefore, if such a fixing member 30 is employed, even in the case of the protective tube 7 made of a flexible tube, for example, the protective tube 7 can be regularly laid inside the side groove body 2 without crossing, and a plurality of protection tubes The laying operation when the tube 7 is stored in the side groove 1 can be appropriately performed.

[Addition of waterway members]
FIG. 7 is an explanatory diagram showing a construction procedure of the first construction method when the water channel member 13 is additionally constructed in the drainage space 12.
In the first construction method (FIG. 1), the drainage space 12 formed above the in-groove foundation 11 made of hardened concrete 9 is used as a drainage channel as it is, but as shown in FIG. A step of separately storing the water channel member 13 made of a precast concrete block in the drainage space 12 may be added.

In this case, the drainage space 12 above the base part 11 in the groove functions as a storage space for the water channel member 13, and the drainage function of the side groove 1 after construction is secured by the drainage channel 13 </ b> A inside the water channel member 13. become.
FIG. 8A is a cross-sectional view of the water channel member 13 having a standard cross section when the pavement is not raised. Moreover, FIG.8 (b) is sectional drawing of the channel member 14 of the irregular cross section in the case of raising the pavement.

As shown in FIG. 8A, when the upper end edge of the existing gutter 1 coincides with the pavement surface of the road, that is, in the case of normal construction in which the pavement is not raised, it fits inside the drainage space 12. What is necessary is just to employ | adopt the water channel member 13 of a standard cross section.
On the other hand, as shown in FIG. 8 (b), in the case of a road section where the pavement is raised so that the pavement surface is higher than the upper end edge of the existing gutter 1, the pavement surface and the height after the increase are increased. What is necessary is just to employ | adopt the channel member 14 of the irregular cross-section for making it correspond.

In the water channel member 14 of FIG. 8B, not only has the drainage channel 14 </ b> A inside, but also a flange portion 14 </ b> B that covers the upper end surface of the existing side groove 1 from above is protrudingly provided at both width direction portions. The thickness dimension of the flange portion 14B is set to a dimension that matches the pavement thickness of the road to be raised.
In this way, if the drainage space 12 is provided with the water channel member 14 having an irregular cross section corresponding to the pavement level of the road, even if there is a change in the pavement level depending on the road section where the common groove is formed, the side groove 1 after construction is provided. The drainage function can be effectively secured.

In the examples of FIGS. 7 and 8, the drainage channels 13A and 14A are exemplified as the channel members 13 and 14 having a circular cross section and no lid member, but the cross-sectional shape of the channel members 13 and 14 is limited to this. Instead, for example, a water channel member in which the cross section of the drainage channel is U-shaped and a lid member (including grating) is required may be employed.
Moreover, in the example of FIG.7 and FIG.8, although the case where the waterway members 13 and 14 were added in the 1st construction method (FIG. 1), the waterway members 13 and 14 were added in the 2nd construction method (FIG. 2). Also good.

[Problems when constructing foundations in all side grooves in the target section]
FIG. 9 is a road plan view showing an example of the target section L0 to be jointed.
In the example of FIG. 9, the target section L0 includes a plurality of existing side grooves 1 that are continuously installed in a straight line along the traveling direction of the road (left and right direction in FIG. 9).

In this case, for example, if the in-groove base portion 11 is constructed in all the side grooves 1 included in the target section L0, maintenance of the cable 7A laid inside the protective tube 7 is performed as shown by a virtual line in FIG. A new handhole section 40 is required to do this.
Further, in this case, it is necessary to install the newly installed handhole portion 40 at a position offset in the road width direction with respect to the existing gutter 1 (in the example of FIG. 9, a position offset toward the center of the road). .

  However, when the hand hole portion 40 is newly installed at a position offset from the line where the side grooves 1 are lined to the center of the road, the material cost is increased by the amount of the new hand hole portion 40, the removal of the pavement, the earth and sand Construction such as excavation, installation of a handhole section, backfilling of earth and sand, and restoration of road pavement must be performed, resulting in an increase in construction cost.

  Therefore, as shown in FIG. 9, a plurality of the existing side grooves 1 included in the target section L0 belong to the first section L1 that does not require the handhole section 40, and the second section L2 that requires the handhole section 40. In the side groove 1 belonging to the first section L1, the foundation 11 in the groove is constructed, and the side groove 1 in the second section L2 is installed without constructing the foundation 11 in the groove. It is preferable to change the function of the side groove 1 as the handhole portion 41.

In this way, a part of the plurality of existing side grooves 1 included in the target section L0 can be reused as the handhole portion 41 as it is.
Therefore, the material cost can be reduced to the extent that the new hand hole portion 40 is not required, and the new hand hole required when the new hand hole portion 40 is installed at a position offset in the road width direction. It is not necessary to perform a series of construction from the removal of the pavement required for the installation of the part 40 to the repair, and the construction cost can be reduced.

  In the example of FIG. 9, there is only one side groove 1 belonging to the second section L2, but when the extension of the second section L2 is longer than the existing side groove 1, two or more continuous side grooves 1 are provided. May be changed to the handhole portion 41.

[Construction method for changing the function of the side groove to the hand hole]
FIG. 10 is an explanatory diagram showing a construction procedure for changing the function of the existing side groove 1 </ b> A to the handhole portion 41.
In FIG. 10, the reference numeral “1A” means the side groove 1 belonging to the second section L2 in FIG.

As shown in FIG. 10, first, an appropriate portion of the side wall portion 4 of the side groove 1 </ b> A is cut to a necessary size to form an opening portion 42 for drawing the cable.
Next, a pair of damming plates 43 and 43 arranged at positions where the opening 42 is sandwiched from both sides in the longitudinal direction are fixed inside the side groove 1A. The dam plate 43 is formed with a connection hole 43 </ b> A for the protective tube 7. And the edge part of the protective tube 7 laid in the other side groove 1 which belongs to the 1st area L1 (refer FIG. 9) is connected to the connection hole 43A, and the lower space of the said side groove 1A and the other side groove 1 is isolate | separated.

  Thereby, a portion surrounded by the pair of damming plates 43, 43 in the inner space of the side groove 1A is partitioned as the maintenance space 44 of the cable 7A, and the side groove 1A belonging to the second section L2 is modified as the handhole portion 41. Can do.

In the example shown in FIG. 10, the pair of damming plates 43 and 43 have the same height as the cross-sectional height of the in-groove base portion 11 constructed in the adjacent side groove 1, and an angle extending in the longitudinal direction of the side groove 1 </ b> A. The four corners are connected to each other by a connecting frame 45 made of a material.
Further, the upper two connecting frames 45 among the four connecting frames 45 function as support portions that detachably support the end portions in the width direction of the inner lid member 46. For this reason, the maintenance space 44 can be detachably closed by the inner lid member 46, and the bottom surface of the drainage space 12 is formed by the upper surface of the middle lid member 46 when closed.

In the case of the handhole portion 41 in FIG. 10, the bottom surface of the drainage space 12 is formed by the upper surface of the inner lid member 46, and therefore the drainage space 12 of the side groove 1 located upstream of the side groove 1A is not dammed up. Then, the inner lid member 46 cannot be removed.
However, in a state where the inner lid member 46 is closed, the drainage space 12 is not divided by the maintenance space 44 of the handhole portion 41 modified from the side groove 1A. For this reason, it is not necessary to separately construct a side gutter or a water collecting tank for detouring and draining the maintenance space 44, and the construction cost can be reduced.

FIG. 11 is an explanatory diagram showing another construction procedure for changing the function of the existing side groove 1 </ b> A to the handhole portion 41.
In FIG. 11 as well, the symbol “1A” means that the groove 1 belongs to the second section L2 of FIG.

As shown in FIG. 11, first, an appropriate portion of the side wall portion 4 of the side groove 1A is cut to a necessary size to form an opening portion 42 for drawing the cable.
Next, a pair of damming plates 48, 48 arranged at positions where the opening 42 is sandwiched from both sides in the longitudinal direction are fixed inside the side groove 1 </ b> A. The dam plate 48 is formed with a connection hole 48 </ b> A for the protective tube 7. Then, the end portion of the protective tube 7 laid in the other side groove 1 belonging to the first section L1 (see FIG. 9) is connected to the connection hole 48A, and the internal space of the side groove 1A and the other side groove 1 is separated.

  Thereby, a portion surrounded by the pair of damming plates 48, 48 inside the side groove 1A is partitioned as a maintenance space 49 of the cable 7A, and the side groove 1A belonging to the second section L2 can be changed to the hand hole portion 41. it can.

In the example shown in FIG. 11, the pair of damming plates 48, 48 have the same height as the groove height of the side groove 1 </ b> A. For this reason, in the case of the hand hole portion 41 of FIG. 11, the height range of the maintenance space 49 is the same as the height range of the inner space of the side groove 1A.
Accordingly, since the drainage space 12 is divided by the maintenance space 49 of the handhole portion 41 modified from the side groove 1A, it is necessary to separately construct a side groove and a drainage basin for bypassing the maintenance space 49 and draining water. is there.

  However, according to the hand hole portion 41 of FIG. 11, as shown in the figure, the lid member 3 of the side groove 1 can be used as it is as the lid member of the maintenance space 41, and only by removing the lid member 3, Since the cable 7A can be easily accessed, there is an advantage that the maintenance work of the cable 7A can be easily performed as compared with the handhole portion 41 of FIG.

  The embodiment disclosed this time is illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, and includes all modifications that are within the scope of the claims and equivalents.

1 Side gutter (existing drain gutter)
2 Side groove body 3 Lid member 4 Side wall portion 5 Bottom wall portion 7 Protective tube 7A Cable 8 Uncured concrete 9 Hardened concrete 10 Foundation material 11 Groove base portion 12 Drain space 13 Waterway member 14 Waterway member 20 Fixing member 30 Fixing member 41 Hand Hall part 42 Opening part 43 Damping plate 44 Maintenance space 46 Middle lid member 48 Damping plate 49 Maintenance space

Claims (8)

A joint groove forming method for existing side grooves, comprising the following steps (a1) to (c1) and (x) to (y).
(A1) The step of storing the protective tube of the cable in the side groove (b1) The uncured concrete is filled with the uncured concrete at a level lower than the groove height of the side groove. A step of filling (c1) a step of forming a groove base made of hardened concrete containing the protective tube and a drainage space located above the groove base by waiting for the uncured concrete to harden
(X) forming a cable lead-in opening on the side wall of one or more of the side grooves included in the target section that needs to be jointly grooved
(Y) A pair of damming plates arranged at positions sandwiching the opening from both sides in the longitudinal direction are fixed inside the side groove in which the opening is formed, and the pair of damming plates inside the side groove. Process to make the cable maintenance space surrounded by A joint groove forming method for existing side grooves, comprising the following steps (a2) to (c2) and (x) to (y).
(A2) A step of storing a cable protection tube in the side groove (b2) The base material is filled in that order with a foundation material and uncured concrete in that order at a level lower than the groove height of the side groove. And (c2) waiting for the uncured concrete to cure, waiting for the uncured concrete to harden, the foundation in the groove comprising the protective material and the hardened concrete, and the foundation in the groove Forming a drainage space located above the section
(X) A step of forming an opening portion for drawing a cable in a side wall portion of one or a plurality of the side grooves included in the target section that needs to be a joint groove.
(Y) A pair of damming plates arranged at positions sandwiching the opening from both sides in the longitudinal direction is fixed inside the side groove in which the opening is formed, and the pair of damming plates inside the side groove. Process to make the cable maintenance space surrounded by The step (b1) or the step (b2) includes an operation of forming the upper surface of the uncured concrete into a desired water conveyance gradient,
The joint ditching method according to claim 1 or 2, wherein the drainage space is used as it is as a drainage channel whose bottom surface is the upper surface of the foundation in the groove. The step (c1) or the step (c2) includes a step of storing a precast waterway member in the drainage space,
The joint ditching method according to claim 1 or 2, wherein the inside of the water channel member is used as a drainage channel.   The said process (a1) or the said process (a2) includes the operation | work which fixes the longitudinal direction suitable place of the said protection tube accommodated in the said side groove to the said side groove with a fixing member. The joint grooving method described. The step (a1) or the step (a2) includes a work of storing a plurality of the protective tubes in the side groove,
The joint groove forming method according to claim 5, wherein the fixing member has a function of positioning the plurality of protective tubes so that cross sections of the plurality of protective tubes are arranged vertically and horizontally in the side grooves. The pair of damming plates have the same height as the cross-sectional height of the groove base.
The joint groove forming method according to any one of claims 1 to 6, wherein the maintenance space is detachably closed by an inner lid member, and a bottom surface of the drainage space is formed by an upper surface of the inner lid member. The pair of damming plates have the same height as the groove height of the side groove,
The joint groove forming method according to any one of claims 1 to 6, wherein the maintenance space is detachably closed by a lid member of the side groove.

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