JPH08165664A - Branch for common cable groove - Google Patents

Abstract

PURPOSE: To improve the workability, by superposing plural precast blocks having a connecting means at the inner side, in plural stages, when a cable buried under the ground and led in from a cable common groove is branched to another common groove. CONSTITUTION: After bolts are screwed to the insert nuts 4 of a bottom plate block 11, a connecting block 12 is loaded on the block 11. And in this case, bolt heads are inserted and projected through the through holes for cubic form of steel connecting boxes opened inward being buried at the four corners of the block 12. Then, washers with a U-shape in the plane vision are provided to the bolts, and after the blocks 11 and 12 are connected by fastening the bolts, a mortar is filled to a connecting box. While the block 12 and a regulating block 13 are connected in the same manner, a lid 2 is installed on the uppermost stage. Furthermore, water swelling type sponge rubbers are placed on the connecting surfaces, so as to prevent the invasion of the rain water and the like. Consequently, the process can be carried out easily and solidly, and the height can be regulated freely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable joint groove branching portion for branching a telephone wire or other communication and power cables inserted in a cable joint groove into another cable joint groove. It is a thing.

[0002]

2. Description of the Related Art Conventionally, when a cable such as a telephone line is laid in the ground, it is inserted into a cable common groove having a plurality of cable insertion holes, and a plurality of cables are laid together in the same route. There are things to do. When the cable joint grooves are stretched around in this way, the cable joint groove branching portions that connect the cable joint grooves laid from different directions and branch the cable led out from one cable joint groove to the other cable joint groove Will be required. Generally, this type of cable common groove branching portion is formed by forming a formwork at the laying site and placing concrete on the formwork. That is, according to the cable joint groove to be laid, all the work from the assembling of the formwork to the placing of concrete is performed by the work at the site to form the branch portion for the cable joint groove.

[0003]

However, as described above, when concrete is cast on site to form the branch portion for the cable common groove, it is necessary to assemble a formwork. In this formwork, the formwork for holes is provided between the formwork for walls so that the through holes are formed after the concrete is placed in line with the insertion holes for inserting the cables in the cable joint groove. The structure was complicated and required skill. Therefore, it took a considerable number of construction days just to form the formwork.

In addition, it takes time to set concrete and harden it, and it is necessary to remove the formwork after the concrete hardens. In other words, in the case of such on-site construction, a considerable amount of work is required in addition to the formation of the formwork, the placing of concrete, the removal of the formwork, and the foundation work, making it difficult to shorten the process. In addition, when pouring concrete, it could be affected by the weather, which included the possibility of extending the construction period.

[0005] An object of the present invention is to solve such a problem.

[0006]

In order to achieve the above object, the present invention takes the following measures. That is, the cable common groove branching portion according to the present invention is a cable common groove branching portion for branching a cable buried in the ground and introduced from the cable common groove to another cable common groove, and is connected to the inner surface. It is characterized in that a plurality of precast blocks provided with the means are stacked and connected.

As the precast block of the present invention,
A bottomed slab block provided on the foundation, an annular coupling block communicating with the cable common groove provided on the slab block and coupled to the side surface, and a height above the coupling block and the ground And an annular height adjusting block for adjusting

As the connecting means, there is a connecting box which is open toward the inside and has a through hole in the lower end wall and which is embedded by exposing the end wall on the lower joining end surface of the precast block. An insert nut embedded in a position corresponding to the connection box on the upper joining end surface of the precast block, and a bolt having a head portion having a size capable of penetrating a through hole of the connection box to be screwed to the insert nut. It is preferable that the head be provided with a washer that is provided between the head and the end wall when the head projects into the connecting box and has a notch hole with which the head engages.

In order to prevent rainwater and the like from entering from the joint end faces, a water-expandable sponge rubber for sealing is provided between the joint end faces of the slab block, the connecting block and the height adjusting block.

[0010]

With such a construction, at the construction site, the precast blocks are stacked in a desired number of steps, and the precast blocks are connected by the connecting means formed on the inner surface thereof to form the cable common groove branching portion. It In other words, the site work is only the work of stacking a plurality of precast blocks, the work of connecting them, and the work of connecting the cable common groove. As a result, the construction period can be shortened far more than that required for assembling the formwork and placing concrete. Moreover, since the precast block has a preformed shape, no skilled technique is required to stack the precast blocks, and the work period can be shortened by facilitating the work contents.

If the precast block is composed of a bottomed slab block, an annular connecting block, and an annular height adjusting block, it corresponds to the number of cable joint grooves to be connected depending on the situation of the site. It becomes possible to deal with the change flexibly. In addition, if the height is adjusted by the height adjusting block, the depth of the connecting block in the ground can be easily adjusted.

Further, the connecting means is a connecting box which opens toward the inner surface and has a through hole in the lower end wall, and which is embedded in the lower joining end surface of the precast block by exposing the end wall. An insert nut embedded in a position corresponding to the connection box on the upper joining end surface of the precast block, and a bolt having a head size capable of penetrating a through hole of the connection box screwed to the insert nut, By having a configuration with a washer that is interposed between the head and the end wall when the head has a notch hole with which the head engages and projects into the connecting box,
Functions of both the projection for positioning and the fastener for connection,
It becomes possible to give to the bolt. That is, when a bolt is screwed to the insert nut of the precast block placed on the lower side and the other precast block is stacked on the precast block, the bolt is inserted through the through hole of the connecting box. When the bolt penetrates, the precast block moves only within the range of the through hole, so that both precast blocks are substantially positioned relative to each other. In this state, by interposing a washer between the head of the bolt and the end wall of the connecting box and tightening, both precast blocks can be firmly connected.

In addition, if a water-expandable sponge rubber is provided between the connecting end faces of each precast block, it is possible to effectively prevent rainwater and the like from entering the precast block from between the connecting end faces. Become.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 and 2, a cable common groove branch portion (hereinafter referred to as a branch portion) D is a plurality of concrete precast blocks 1, that is, a bottom slab block 11.
The connection block 12 and the height adjustment block 13 are sequentially stacked, and the lid 2 is fixed on the height adjustment block 13 to construct the structure. This precast block 1
At the laying site, it is formed in a size that can be carried relatively easily by one or two workers. The cable joint groove G is similarly constructed by connecting the precast blocks 9 each having a size that can be carried by one operator. As such a precast block 9,
For example, it is preferable to use a prismatic outer shape having two cable insertion holes 9a arranged vertically side by side therein and capable of being connected by a connecting plate 9b on the outer surface thereof, but the connecting structure is not limited to this. is not. The cable insertion hole 9a is formed in the cable insertion hole 12 of the connection block 12 described later.
Butt the precast block 9 to the connecting plate 9
It is connected and fixed to the connecting block 12 by c.

More specifically, the slab block 11 has a concave portion 11a in the central portion of a bottomed square shape in a plan view, and is laid on a stone stone foundation via a mortar layer (both not shown). . This bottom slab block 11 has a shape in which a thick and low side wall is erected around a recess 11a obtained by cutting off each corner of the square bottom face at an angle of 45 °, and the side wall formed in an annular shape. The upper surface of is the upper joint end surface 11
b. An annular groove that is substantially parallel to the outer shape of the bottom slab 11 is formed in a portion of the upper joint end surface 11b near the outer peripheral surface and the inner peripheral surface so that the water-expandable sponge rubber 3 can be filled therein. ing. Also, the upper joint end face 1
An insert nut 4 which is a connecting means 8 is embedded in a corner portion on the inner surface side of 1b. The position where the insert nut 4 is buried corresponds to the buried position of the connecting box 5 which is the connecting means 8 described later.

The connecting block 12 has the same height and outer shape as the bottom slab 11 and does not have a bottom unlike the bottom slab 11. That is, the connection block 1
2 has a shape in which a hollow prism is sliced like a height adjusting block to be described next. In other words, the connecting block 12 and the height adjusting block have basically the same shape as the side wall of the bottom block 11. The connection block 12 is provided with a cable insertion hole 12a on each side surface that penetrates to the inner surface. In this example,
The cable insertion hole 12a has a 6-hole structure of two rows and three columns, in accordance with the precast block 9 having a plurality of cable insertion holes 9a for constructing the cable common groove G. The number of the cable insertion holes 12a of the connection block 12 may be increased or decreased according to the number of the cable insertion holes of the cable joint groove G to be connected. Like the bottom slab block 11, an insert nut 4 is embedded in a corner portion on the inner surface side of the upper joint end surface 12b, and an annular groove is formed in a portion near the outer peripheral surface and the inner peripheral surface to expand water. The sponge rubber 3 is filled. Furthermore, the connection block 1
On the inner surfaces of the four corners of 2, there are embedded cubic connection boxes 5 that open inward.

As shown in FIG. 3, the connecting box 5 is made of, for example, iron and is attached to the connecting block 12 and the height adjusting block 13, and the positions thereof are also the same. The connecting box 5 has a through hole 5 in the lower end wall 5a.
b. The through hole 5b is an oval hole through which the head of the bolt 6 screwed into the insert nut 4 can pass. For this reason, the outer surface of the end wall 5 a has the lower joining end surface 1 of the connecting block 12 and the height adjusting block 13.
It appears in 2c and 13c. On the other hand, the bolt 6 is a cylindrical head 6b having a hexagonal wrench hook 6a at the tip.
And a shaft portion 6c having a diameter smaller than that of the head portion 6b and having a thread engraved on the outer periphery. Then, the bolts 6 are screwed into the insert nuts 4 with a tightening margin left. With respect to the structure of the connecting box 5 and the bolt 6 as described above, the end wall 5a of the connecting box 5 and the bolt 6 are connected to each other so that the bolt 6 having the head 6b protruding therein can be fastened in the connecting box 5. A washer 7 is interposed between the head 6b. As shown in FIG. 7, the washer 7 is a flat plate shaped in a circular shape, and has a slotted notch 7a that opens to the outer peripheral edge thereof. The opening width w of the cutout portion 7a depends on the diameter of the shaft portion 6c of the bolt 6 and the head portion 6b.
It is set to an intermediate size with the diameter of the shaft portion 6c so that the shaft portion 6c can be inserted into the notch portion 7a. The insert nut 4, the connecting box 5, the bolt 6 and the washer 7 constitute a connecting means 8.

The height adjusting block 13 is the connecting block 1.
It has the same outer shape as that of No. 2 and is different in that it does not have the cable insertion hole 12a, and the burying position of the insert nut 4 and the connecting box 5 and the filling position of the water-expandable sponge rubber 3 are the same. In such a structure, in the height adjusting block 13, the insert nut 4 for fixing the iron lid 2 when used in the uppermost stage is provided at the portion between the water-expandable sponge rubbers 3 of the upper joint end surface 13b. It is buried in. The lid 2 has a receiving frame 2a that is in close contact with the upper joining end surface 13b of the height adjusting block 13, and a lid main body 2b that is raised further is integrally formed in the central portion of the receiving frame 2a. The height adjustment block 13
May be the same height as the connecting block 12 or may be lower than the connecting block 12. Then, in order to easily adjust the overall height of the branch D to the height to the road or sidewalk when buried, prepare a plurality of types with different heights and stack them in combination according to the situation at the site. It may be one.

In such a configuration, the bottom block 1
The stacking structure of 1, the connecting block 12, and the height adjusting block 13 will be described. The connecting block 12 and the height adjusting block 13 are different in the number of stacks depending on the site, and in this embodiment, the most basic one stage will be described.

First, the connecting block 12 is replaced with the bottom block 1.
When the upper joint end surface 11b of the bottom slab block 11 and the lower joint end surface 12c of the connecting block 12 are abutted against each other and mounted on the base plate 1, the respective insert nuts 4
Screw the bolt 6 on. In this case, the bolt 6 is not completely tightened, but is screwed while leaving a tightening margin equal to or more than the total thickness of the end wall 5a of the connecting box 5 and the washer 7. After that, the connecting block 12 is transferred onto the bottom slab 11 and the head 6b of the bolt 6 is passed through the through hole 5b of the connecting box 5 of the connecting block 12 to project into the corresponding connecting box 5 (FIG. 3). ). After that, the heads 6b of the bolts 6 and the connection box 5 are
A washer 7 is provided between the end wall 5a and the inner surface of the end wall 5a. The washer 7 is configured so that the shaft portion 6c of the bolt 6 is inserted into the cutout portion 7a. That is, the cutout portion 7a is replaced with the shaft portion 6
By inserting the washer 7 in a direction orthogonal to the axis of the bolt 6 in correspondence with c, the washer 7 is inserted into the bolt 6
It can be interposed between the head part 6b and the inner surface of the end wall 5a of the connection box 5 (FIGS. 4 and 5). Then, by tightening the bolts 6 in this state, the bottom slab block 11 and the connection block 12 can be firmly joined. Then, the connection box 5 is filled with mortar (FIG. 6). This bottom block 11 and connecting block 1
Similar to the connection with 2, the connection block 12 and the height adjustment block 13 are connected.

In this way, when the bottom slab block 11, the connecting block 12 and the height adjusting block 13 are stacked and connected, the bolts 6 screwed into the insert nuts 4 engage with the corresponding through holes 5b of the connecting box 5. Together, they serve as positioning pins, so the bottom block 1
It is possible to reliably prevent the positional deviation between the 1 and connection block 12 and the connection block 12 and the height adjustment block 13. In addition, thereafter, by simply inserting the washer 7 and tightening the bolt 6, the vertically adjacent precast blocks 1 can be firmly connected and coupled to each other. Therefore, after stacking the precast blocks 1, it is not necessary to correct the positional deviation of the precast blocks 1 or to attach the connecting plate to a required position and screw the bolt 6 to a predetermined nut. The branch portion D can be constructed efficiently and reliably.
The branching part D constructed in this way has the bottom block 11, the connecting block 12, and the connecting block 1
2 and the height adjusting block 13 are firmly connected to each other by the bolts 6, so that the bottom plate block 11, the connecting block 12, and the height adjusting block 13 are displaced by the uneven earth pressure generated during the backfilling work. Of course, there will be no occurrence of.

Further, since the connecting block 12 and the height adjusting block 13 are stacked on the bottom slab 11, the cable common groove G can be changed by the connecting block 12 and the height to the surface of the road or the like. The height adjustment block 13 can flexibly deal with each change. Moreover, since the water-expandable sponge rubber 3 is interposed between the joint end surfaces, rainwater and the like can be reliably prevented from entering the inside from this portion.

The present invention is not limited to the embodiment described above. For example, although the washer 7 has a circular flat plate shape, it may have a rectangular flat plate shape. Further, the washer may have a wedge shape whose thickness becomes smaller toward the opening side of the cutout. With such a wedge-shaped washer, each precast block 1 is firmly joined and connected only by driving the washer between the head 6b of the bolt 6 and the end wall 5a of the connecting box 5 and wedge-fitting. be able to.

The connecting block 12 may be provided with the cable insertion hole 12a in advance at the factory, but the cable insertion hole may be provided on site. In this case, the factory preliminarily forms a plurality of guide holes on the surface of the connecting block that do not penetrate to the inside at a predetermined pitch, and uses one of the guide holes as a guide on site.
A cable insertion hole may be bored at that position. Alternatively, no guide hole or the like may be provided in the connecting block, and the cable insertion hole may be bored at an arbitrary position and angle depending on the situation of the site.

In addition, the configuration of each section is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0027]

Industrial Applicability As described in detail above, the present invention can be formed by stacking a desired number of precast blocks and connecting the precast blocks by connecting means formed on the inner surface of the precast blocks. , The construction period can be much shortened as compared with the one which requires concrete pouring. Moreover, since the precast block has a preformed shape, no skilled technique is needed to stack the precast blocks, and the work period can be shortened by facilitating the work contents.

If the precast block is composed of a bottomed slab block, an annular connecting block, and an annular height adjusting block, it corresponds to the number of cable joint grooves to be connected depending on the situation of the site. It is possible to deal with the change flexibly. In addition, if the height is adjusted by the height adjusting block, the depth of the connecting block in the ground can be easily adjusted.

Further, the connecting means is a connecting box which is opened toward the inside and has a through hole in the lower end wall and is embedded by exposing the end wall to the lower joining end surface of the precast block, An insert nut embedded in a position corresponding to the connection box on the upper joining end surface of the precast block, and a bolt having a head size capable of penetrating a through hole of the connection box screwed to the insert nut, By having a configuration with a washer that is interposed between the head and the end wall when the head has a notch hole with which the head engages and projects into the connecting box,
Functions of both the projection for positioning and the fastener for connection,
Can be given to the bolt. Moreover, by interposing the washer between the head of the bolt and the end wall of the connecting box and tightening, both precast blocks can be firmly connected.

In addition, if a water-expandable sponge rubber is provided between the joint end faces of each precast block, it is possible to effectively prevent rainwater and the like from entering the precast block from between the joint end faces.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the same embodiment.

FIG. 3 is a process explanatory view showing a connecting process of the connecting means of the embodiment.

FIG. 4 is a process explanatory view showing a connecting process of the connecting means of the embodiment.

FIG. 5 is a process explanatory view showing a connecting process of the connecting means of the embodiment.

FIG. 6 is a process explanatory view showing a connecting process of the connecting means of the embodiment.

FIG. 7 is an exploded perspective view showing the connecting means of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Precast block 2 ... Lid 2a ... Receiving frame 2b ... Lid main body 3 ... Water-expandable sponge rubber 4 ... Insert nut 5 ... Connection box 5a ... End wall 6 ... Bolt 6a ... Wrench hook 6b ... Head 6c ... Shaft 7 ... Washer 7a ... Notch portion 8 ... Connecting means 9 ... Precast block 9a ... Cable insertion hole 9b, 9c ... Connecting plate 11 ... Bottom plate block 11a ... Bottom surface 11b, 12b, 13b ... Upper joining end surface 12 ... Connecting block 12a ... Cable inserting hole 12c, 13c ... Lower joint end surface 13 ... Height adjustment block D ... Branch portion for cable joint groove G ... Cable joint groove w ... Opening width

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[Procedure amendment]

[Submission date] December 21, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010]

With such a construction, at the construction site, the precast blocks are stacked in a desired number of steps, and the precast blocks are connected by the connecting means formed on the inner surface of the precast blocks to form the branch portion for the cable common groove. To be done. In other words, the site work is only the work of stacking a plurality of precast blocks, the work of connecting them, and the work of connecting the cable common groove. As a result, the construction period can be shortened far more than that required for assembling the formwork and placing concrete. Moreover, since the precast block has a preformed shape, no skilled technique is required to stack the precast blocks, and the work period can be shortened by facilitating the work contents.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

The connecting block 12 has the same outer shape as the bottom slab 11 and does not have a bottom unlike the bottom slab 11. That is, the connection block 12 is
Similar to the height adjustment block described next, it has a shape in which a hollow prism is sliced. In other words, the connecting block 12 and the height adjusting block have basically the same shape as the side wall of the bottom block 11. This connecting block 12
A cable insertion hole 12a is formed in each of the side surfaces so as to penetrate to the inner surface. In this embodiment, the cable insertion hole 12a has a structure of two holes and three rows of six holes in accordance with the precast block 9 having a plurality of cable insertion holes 9a for constructing the cable joint groove G. The number of the cable insertion holes 12a of the connection block 12 is
It may be increased or decreased according to the number of cable insertion holes of the cable joint groove G to be connected. Like the bottom slab block 11, an insert nut 4 is embedded in a corner portion on the inner surface side of the upper joint end surface 12b, and an annular groove is formed in a portion near the outer peripheral surface and the inner peripheral surface to expand water. The sponge rubber 3 is filled. Further, 4 of the connecting block 12
A cube-shaped connecting box 5 is embedded in the inner surface of the corner and opens inward.

Claims (4)

[Claims] 1. A branch portion for a cable joint groove, which is buried in the ground and is branched from a cable joint groove into another cable joint groove, wherein a plurality of precast blocks having connecting means on the inner surface thereof are provided. A branch portion for a cable common groove, which is characterized by being stacked and connected. 2. A precast block having a bottomed bottom slab provided on a foundation, an annular coupling block communicating with a cable joint groove provided on the bottom slab and coupled to a side surface, and a precast block of the coupling block. The cable joint groove branching part according to claim 1, comprising an annular height adjusting block which is provided above and which adjusts a height with respect to the ground. 3. A connecting box, wherein the connecting means is opened toward the inside and has a through hole in the lower end wall, and is embedded by exposing the end wall to the lower joint end surface of the precast block. An insert nut embedded in a position corresponding to the connection box on the upper joining end surface of the precast block, and a bolt having a head size capable of penetrating a through hole of the connection box screwed to the insert nut, A washer is provided between the head and the end wall when the head projects into the connecting box and has a notch hole with which the head engages. Item 1
Alternatively, the cable joint groove branching part according to item 2. 4. The cable joint groove branching portion according to claim 1, wherein a water-expandable sponge rubber for sealing is provided between the coupling end faces of each precast block.