JP6920687B2 - Hand hole - Google Patents

Description

The present invention relates to a hand hole constructed by stacking tubular blocks, which is an underground box used for relaying in underground pipeline burial work, and is particularly used for a hand hole buried in a roadbed for railways. Regarding effective technology.

On railway lines, signal lines for transmitting signals and supplying power to railway equipment and underground pipelines through which power lines pass are buried along the railway lines, and hand holes are used as relay equipment. Is provided in the roadbed. In many cases, handholes for railways are constructed by stacking concrete tubular blocks in consideration of ensuring a predetermined depth and ease of construction.

As shown in FIGS. 4A and 4C, the fitting structure of the upper and lower tubular blocks in the conventional stacking type hand hole provided on the railway line is generally a structure that receives the load of the upper block on a flat surface. It was a target. In the case of the fitting structure of FIG. 4A, in order to increase the strength against the horizontal load, it is necessary to fill the gap (play space) formed between the blocks with mortar or an adhesive.

Further, handholes having a fitting structure as shown in FIG. 4C are described in, for example, Patent Documents 1 and 2. In the handhole of Patent Document 1, there is a gap between the fitting portions of the upper and lower blocks. As a waterproof member, a packing is inserted or a putty material or the like is filled. Further, in the hand hole of Patent Document 2, an adhesive is filled in the gap between the fitting portions of the upper and lower blocks.

Registered Utility Model No. 3018423 Japanese Unexamined Patent Publication No. 2015-4163

Conventionally, in railway lines, as described in Patent Document 2, the hand hole is often provided in the center of the roadbed, and the tubular block constituting the conventional hand hole is used in such a place. It was designed with that in mind. Since it became necessary to provide the hand hole 100 on the shoulder of the railway line as shown in FIG. 5, the present inventors examined the strength of the hand hole provided on the shoulder. As a result, it was found that the hand hole provided on the shoulder of the road has a large lateral load from the center side of the roadbed, and therefore the tubular block constituting the conventional hand hole is not strong enough. Therefore, we examined a technique to increase the strength of the hand hole against a lateral load.

For example, as in Patent Document 2, if the gap between the fitting portions of the upper and lower blocks is filled with an adhesive, the strength against a horizontal load can be increased. However, it is very difficult to uniformly and evenly fill the gaps between the fitting portions of the upper and lower blocks with an adhesive or the like, and it is extremely difficult to achieve sufficient strength with good reproducibility.
Further, in the fitting structure as shown in FIG. 4 (A), as shown in FIG. 4 (B), the force acting in the lateral direction with respect to the block acts as a horizontal shear force, so that the shear is sheared. There is a problem that the resistance length (wavy line portion) is short, sufficient horizontal proof stress cannot be obtained, and cracks are likely to occur. The same applies to the fitting structure as shown in FIG. 4 (C).

Further, the concrete tubular block constituting the conventional stacking type hand hole has vertical and horizontal reinforcements inside, but since it was a single-layer reinforcement, the present inventors. Examined to increase the horizontal strength by making the internal reinforcements multi-layered (doubled). However, if the internal reinforcement is multi-layered, the thickness of the block becomes thick and the weight increases significantly, while if the internal reinforcement is multi-layered while maintaining the thickness of the conventional block, the ready-mixed concrete does not enter well and the quality It became clear that there was a problem that it became difficult to maintain.

The present invention has been made by paying attention to the above-mentioned problems, and an object of the present invention is that it is possible to increase the horizontal proof stress without causing a significant increase in weight or deterioration of quality of the tubular block. To provide a hand hole.
Another object of the present invention is to provide a hand hole capable of preventing center deviation from occurring when the tubular blocks are stacked.

In order to achieve the above object, the present invention
In a hand hole constructed by stacking multiple tubular blocks
Of the two tubular blocks joined to each other, the lower end surface of the upper tubular block and the upper end surface of the lower tubular block have the same inclination angle and are in contact with each other to form a gradient receiving structure. It is configured so that each tapered surface is formed.

According to the hand hole configured as described above, the tapered surfaces of the upper and lower tubular blocks constituting the gradient receiving structure allow the horizontal force to be released in the diagonal direction to reduce the horizontal force and reduce the horizontal force. Since the shear resistance length is longer than that of the conventional one that receives a load due to contact between horizontal planes, the horizontal strength can be increased without causing an increase in weight or deterioration in quality of the tubular block.

Here, preferably, each of the plurality of tubular blocks has a frame-shaped main body portion having the same shape in which the tapered surfaces forming the gradient receiving structure are formed on the upper end surface and the lower end surface.
According to this configuration, since a hand hole can be constructed by stacking a plurality of tubular blocks having the same shape, it is not necessary to design and manufacture tubular blocks having different shapes, and the cost of the tubular blocks is reduced. can do.

Further, preferably, the plurality of tubular blocks have a rectangular shape in a top view, and inclined through holes are formed at four corners of the upper end surface of the uppermost tubular block among the plurality of tubular blocks, and the front surface is formed. serial comprises a rectangular cover plate is placed on the top of the cylindrical block, the four corners of the cover plate, wherein formed in the four corners of the upper end surface of the uppermost cylindrical block A locking piece having an insertion hole that projects upward from the inclined through hole and communicates with the corresponding inclined through hole is provided.
According to the above configuration, the cover plate can be fixed to the uppermost tubular block by using the locking piece provided on the cover plate, thereby preventing the cover plate from being misaligned and stolen. Can be done.

Here, an embedded nut is embedded in one of the inclined through holes in the continuous direction, and a bolt portion of a bolt inserted in the other inclined through hole is screwed into the embedded nut. You may want to be there.
According to such a configuration, when a plurality of tubular blocks are stacked, the tubular blocks can be connected to each other to prevent the blocks from shifting in the lateral direction due to vibration or the like.

Further, preferably, the plurality of tubular blocks are formed so that the thickness of the side wall of one set of the two sets of side walls facing each other is thicker than the thickness of the side wall of the other set.
When the hand hole is buried in the shoulder of a railway line, the load applied from the rail side is larger than the load from the other direction, but the tubular blocks are arranged and stacked so that the thick side wall faces the rail side. As a result, the strength against lateral load can be increased and the durability of the hand hole can be improved.

Further, the plurality of tubular blocks having a rectangular shape when viewed from above are continuous with inclined through holes formed at four corners of the upper end surface and at four corners of the lower end surface of another tubular block joined to the upper portion. A directional inclined through hole is formed,
At the four corners of the lower end surface, inclined through holes in a direction continuous with the inclined through holes formed at the four corners of the upper end surface of the other tubular block to be joined to the lower portion may be formed. ..
According to this configuration, using the inclined through holes provided in each of the stacked tubular blocks, for example, by inserting a pin or a bolt, the inclined through holes are corrected so as to line up in a straight line. Therefore, it is possible to prevent center deviation from occurring when a plurality of tubular blocks are stacked, and it is possible to increase the strength against a lateral load.

According to the present invention, it is possible to realize a hand hole capable of increasing the horizontal proof stress without causing an increase in weight or a decrease in quality of the tubular block. Further, according to the hand hole according to the present invention, there is an effect that it is possible to prevent center deviation from occurring when the tubular blocks are stacked.

It is a perspective view, a central sectional front view, and an enlarged sectional view which show one Embodiment of the tubular block which comprises the hand hole which concerns on this invention. It is a cross-sectional plan view and a cross-sectional side view which show the detail of the tubular block of embodiment. An example of a cover plate constituting the hand hole of the embodiment is shown, where (A) is a plan view and (B) is a front view. It is a partially enlarged view which shows an example of the structure of the joint part of the tubular block which constitutes the conventional hand hole. It is a perspective view which shows the example of the position of the hand hole in the roadbed which constructs the hand hole of embodiment.

Hereinafter, embodiments of the hand hole according to the present invention will be described in detail with reference to the drawings.
1 (A) is a perspective view showing an embodiment of a tubular block constituting the hand hole according to the present invention, FIG. 1 (B) is a front view of the central cross section thereof, and FIG. 1 (C) is an upper and lower tubular block. It is an enlarged cross-sectional view of the joint part of. 2 (A) is a cross-sectional plan view showing a cross-sectional structure of the tubular block of FIG. 1, and FIG. 2 (B) is a side perspective view showing an example of arrangement of reinforcing bars.

As shown in FIG. 1, the tubular block 10 constituting the hand hole of the present embodiment has a substantially square top view, and the upper end surface and the lower end surface of the frame-shaped main body portion 11 having the opening 11A have joints 12A, 12B is formed. The frame-shaped main body portion 11 is configured as, for example, a reinforced concrete block having a single-layer reinforcement composed of vertical reinforcement and horizontal reinforcement inside. The frame-shaped main body portion 11 is not limited to a square shape and may be a rectangular shape. Further, it is not a perfect rectangle, and each corner is provided with a chamfer taper (chamfer cut portion) so that the corners of the outer wall surface and the inner wall surface are not sharpened.

The upper end joint portion 12A of the tubular block 10 has an inner flat surface 12a and an outer side so as to have a step having a height of 1/3 to 1/2 of the thickness of the frame-shaped main body portion 11 over the entire circumferential direction of the block. A flat surface 12b is formed, and a tapered surface 12c of about 45 degrees is formed between the inner flat surface 12a and the outer flat surface 12b (see FIG. 1B).

On the other hand, the lower end joint portion 12B of the tubular block 10 has a step with a height of 1/3 to 1/2 of the thickness of the frame-shaped main body portion 11 corresponding to the shape of the upper end joint portion 12A. The inner flat surface 12d and the outer flat surface 12e are formed, and a tapered surface 12f of about 45 degrees is formed between the inner flat surface 12d and the outer flat surface 12e (see FIG. 1 (B)). ..
The upper end joint portion 12A of the tubular block 10 is formed inward and the lower end joint portion 12B is formed in an annular shape, so that when the two tubular blocks 10 are stacked, the upper and lower annular joint portions are formed in an annular shape. The structure is such that (12A, 12B) are fitted together.

The upper end joint portion 12A is designed so that the width of the inner flat surface 12a is larger than the width of the outer flat surface 12b, and the lower end joint portion 12B is designed so that the width of the inner flat surface 12d is the width of the outer flat surface 12e. As shown in FIG. 1C, a gap is formed between the flat surfaces 12a-12d and 12b-12e by designing the surface to be smaller than the above. As a result, when the two tubular blocks 10 are overlapped, the tapered surface 12c of the upper end joining portion 12A of the lower tubular block and the tapered surface 12f of the lower end joining portion 12B of the upper tubular block come into contact with each other. It functions as a gradient receiving structure that supports the load on the inclined surface.

Further, as shown in FIG. 1A, the chamfered cut portions at the four corners of the upper end joint portion 12A of the frame-shaped main body portion 11 are directed from the outer side to the inner block center line extension of the frame-shaped main body portion 11. Inclined through holes 13a to 13d that are inclined downward are provided. Further, although not shown in FIG. 1 (A), the chamfered cut portions at the four corners of the lower end joint portion 12B are provided with inclined through holes 14a to 14d having the same inclination (FIG. 2 (A)). )reference).
When the two tubular blocks 10 are overlapped, the inclined through holes 13a to 13d and 14a to 14d are the inclined through holes 14a to 14d of the lower end joint portion 12B of the upper tubular block and the lower cylinder. The inclined through holes 13a to 13d of the joint portion 12A on the upper end surface of the shaped block are formed in a positional relationship so as to line up in a straight line.

Further, although not shown, embedded nuts are provided in the inclined through holes 14a to 14d of the lower end joint portion 12B of the tubular block, and from the inclined through holes 13a to 13d of the joint portion 12A on the upper end surface of the lower tubular block. It is configured so that the inserted bolt can be screwed into the embedded nut. An implant bolt may be provided in the inclined through holes 13a to 13d of the joint portion 12A on the upper end surface of the tubular block arranged at the uppermost stage in order to fix the cover plate described below. ..
Further, as shown in FIGS. 2A and 2B, a plurality of vertical reinforcing bars 15a and horizontal reinforcing bars 15b are arranged in a grid pattern inside the wall body of the tubular block 10. ..

3A and 3B show a specific example of the cover plate 20, where FIG. 3A is a plan view and FIG. 3B is a side view.
As shown in FIG. 3A, the cover plate 20 has a metal plate main body 21 having a rectangular shape substantially the same as the outer shape of the flat upper end joint portion 12A of the frame-shaped main body portion 11, and the left and right sides of the plate main body 21. It includes a pair of handles 22A and 22B fixed in the vicinity of (or upper and lower) opposite sides, and locking pieces 23a to 23d provided at four corners of the plate body 21. The locking pieces 23a to 23d are provided with elongated holes 24a to 24d for inserting bolts.

Further, as shown in FIG. 3B, the locking pieces 23a to 23d are formed obliquely so as to be inclined downward and protrude outward. Then, the elongated holes 24a to 24d provided in these locking pieces 23a to 23d are inserted into the implanting bolts provided in the joint portion 12A of the upper end surface of the uppermost tubular block described above. After placing the plate body 21 on the flat upper end joint 12A of the frame-shaped body 11, the cover plate 20 is fixed by screwing a nut (not shown) into the implant bolt and tightening it to fix the ground. It is possible to prevent misalignment and theft due to vibration.

In the hand hole constructed by stacking the tubular blocks 10 having the structure as described above, since the gradient receiving structure is provided at the joint portion of the upper and lower tubular blocks 10, the load Fh in the lateral direction acts. At that time, as shown by the arrow in FIG. 1 (C), the force is converted into the diagonal force Ft along the tapered surface to weaken the horizontal force, and FIGS. 4 (A) and 4 (B). Since the shear resistance length (wavy line portion) is longer than that of the conventional joint structure of the above, shear failure is less likely to occur and a hand hole having high strength against a lateral load can be realized.

In the above embodiment, it has been described that the upper and lower tubular blocks 10 can be connected to each other by bolts inserted into the inclined through holes 13a to 13d and 14a to 14d provided in the joint portion. When the blocks 10 are connected to each other by bolts, stress is concentrated on the bolt-bonded portion of the tubular block 10 and partial damage occurs depending on the direction of force acting, but the weight of the blocks and the weight of the blocks even if they are not connected by bolts. Experiments have shown that the gradient receiving structure can withstand a fairly large lateral load.

Therefore, the inclined through holes 13a to 13d and 14a to 14d and the embedded nuts at the four corners of each tubular block 10 can be omitted. Further, when a plurality of tubular blocks 10 are stacked, the center may be displaced, which may reduce the strength against a lateral load. Therefore, inclined through holes 13a to 13d and 14a to 14d are provided so as to be upper and lower. It may be used for centering the tubular blocks 10. Then, in that case, the bolts and pins may be removed after the centering work using the bolts and pins is completed.

Further, in a hand hole constructed by stacking conventional tubular blocks having a joint structure shown in FIGS. 4 (A) and 4 (C), a gap is generated inside the joint, and mortar or an adhesive is provided in the gap. However, in the hand hole of the present invention formed by stacking the tubular blocks 10 of the above embodiment, the joints of the upper and lower tubular blocks 10 are formed. Since it has a gradient receiving structure, it is not necessary to fill mortar or adhesive to increase the strength even if there is a gap in the joint, and it is only necessary to apply waterproof putty etc. to the entrance of the gap. Will also be easy.

(Modification example)
In the description of the above embodiment, the thickness of the side wall of the frame-shaped main body 11 of each tubular block 10 is not mentioned, but in this modification, one side wall (front wall and front wall) of the two pairs of side walls facing each other is not mentioned. The other side wall (left and right side walls) is designed to be thicker than the rear wall). Then, when the tubular blocks 10 designed in this way are stacked and the hand hole 100 is constructed at a place such as the shoulder of a railway line as shown in FIG. 5, the thicker wall is on the track side. Place it so that it faces you. As a result, it is possible to realize a hand hole having high strength against the lateral load when the hand hole is provided in a place where only the lateral load from one direction is large.

Further, in the description of the above embodiment, it is assumed that the thickness of the side wall of the frame-shaped main body 11 of each tubular block 10 is equal, but a part of any one or more side walls. In addition, a thin portion may be provided so that the work for connecting the underground pipeline through which the cables are passed to the hand hole can be easily performed. Alternatively, it may be provided as a tubular block in which a hole for connecting an underground pipeline is formed in advance.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications and modifications can be made. For example, in the above embodiment, it has been described that the inclination angle of the tapered surface 12c of the upper end joint portion 12A and the tapered surface 12f of the lower end joint portion 12B that enables the gradient receiving structure is 45 degrees, but the tapered surfaces 12c and 12f The inclination angle is not limited to 45 degrees, and may be set to any angle in the range of 25 to 65 degrees, preferably in the range of 40 to 50 degrees.

Further, in the above embodiment, it has been described that the shape of the tubular block is a rectangular frame shape when viewed from above, but the tubular block may be cylindrical. Further, in the above embodiment, the hand holes are constructed by stacking tubular blocks having the same height, but tubular blocks having different heights having joints on the upper end surface and the lower end surface, respectively, as in the above embodiment. May be piled up to build a hand hole.

Further, in the above embodiment, an iron plate is used as the cover plate 20, but a concrete lid may be put on the cover plate 20. Further, in the above embodiment, the upper end surface of the tubular block 10 is provided with a joint portion having a step that slopes downward toward the outside, but a joint portion having a step that slopes downward toward the inside is provided. You may.
Further, in the above embodiment, the present invention has been described assuming a tubular block constituting a handhole for a railway line, but the present invention is not limited to a handhole for a railway line and is buried in a road or the like. It can also be used as a tubular block that constitutes a manhole.

10 Cylindrical block 11 Frame-shaped main body 12A Upper end joint 12B Lower end joint 13a to 13d Inclined through hole 14a to 14d Inclined through hole 15a, 15b Reinforcement 20 Cover plate 21 Plate body 22A, 22B Handle 23a to 23d Locking piece

Claims (4)

A hand hole constructed by stacking multiple tubular blocks.
Of the two tubular blocks joined to each other, the lower end surface of the upper tubular block and the upper end surface of the lower tubular block have the same inclination angle and are in contact with each other to form a gradient receiving structure. tapered surface is formed, respectively,
Each of the plurality of tubular blocks has a frame-shaped main body portion having the same shape in which the tapered surfaces forming the gradient receiving structure are formed on the upper end surface and the lower end surface, respectively.
The plurality of tubular blocks have a rectangular shape when viewed from above, and inclined through holes are formed at four corners of the upper end surface of the uppermost tubular block among the plurality of tubular blocks.
A rectangular cover plate mounted on the uppermost tubular block is provided.
At the four corners of the cover plate, insertion holes that project upward from the inclined through holes formed at the four corners of the upper end surface of the uppermost tubular block and communicate with the corresponding inclined through holes. A hand hole characterized in that a locking piece is provided. The plurality of tubular blocks are formed so that the thickness of the side wall of one set of the two sets of side walls facing each other is thicker than the thickness of the side wall of the other set. Item 1. The hand hole according to item 1. A hand hole constructed by stacking multiple tubular blocks.
Of the two tubular blocks joined to each other, the lower end surface of the upper tubular block and the upper end surface of the lower tubular block have the same inclination angle and are in contact with each other to form a gradient receiving structure. Each tapered surface is formed
The hand is characterized in that the plurality of tubular blocks are formed so that the thickness of the side wall of one set of the two sets of side walls facing each other is thicker than the thickness of the side wall of the other set. hole. Each of the plurality of cylindrical blocks, claim, characterized in Rukoto to have a frame-like body portion of the same shape that the tapered surfaces constituting the slope receiving structure on the upper end face and lower end face are formed respectively 3 hand hole described.

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