JPH0868064A - Concrete box-shaped manhole - Google Patents

Abstract

PURPOSE: To attain self-aligning by conforming a guide hole in the lower end face of a concrete block at an upper place to a guide pin projected from the upper end face of a concrete block at a lower place when concrete blocks are piled up. CONSTITUTION: When a pipe mounting bock 2 is placed on a foundation block 1, the block 2 hung in midair is lowered gradually onto the top face of the block 1. A guide hole 18 formed to the lower end face of the block 2 is conformed to a guide pin 16 projected from the block 1 at that time. When the lower end face of the block 2 is abutted against the upper end face of the block 1 under the state, both stepped sections 12, 13 are engaged properly. Even when precise positioning is not carried out between the blocks 1, 2, slip for adapting the tapered surface of the guide hole 18 along the tapered surface of the guide pin 16 is generated, thus moving and adjusting the block 2 in the longitudinal and horizontal directions. Accordingly, positioning is enabled ]simply and quickly while poor workmanship such as the peeling of a sealing material at the stepped sections can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete box-shaped manhole, and in particular, a box-shaped and tubular concrete block is piled up, and a bottomed box which is connected to a drainage pipe is connected to the bottom and a manhole is connected to the top. The present invention relates to a structure in which a plate is placed.

[0002]

2. Description of the Related Art Drainage pipes that are buried as drainage facilities under the road surface in urban areas are provided with manholes where people can enter and exit from the ground in various places.

Conventionally, this manhole has a box-shaped concrete block which is connected to a drainage pipe as a bottom part, and a plurality of cylindrical concrete blocks are stacked on the bottom part, and a top plate is placed on the top part to form a huge water collecting box. The manhole was formed by stacking circular cylinder-shaped concrete blocks to the required height by communicating with the holes drilled in the top plate, reaching the road surface, and capping the cast iron or concrete lid. Steps are provided on the inner walls of the manhole and the water collecting chamber to allow workers to ascend and descend, and an intermediate floor plate is formed immediately below the manhole to prevent workers from falling to the bottom even if they fall carelessly. (See Jitsuko Sho 58-10760).

By the way, after the box-shaped or tubular concrete blocks are piled up, it is necessary to integrally connect the blocks. According to the invention described in the publication, a steel rod such as a tie rod penetrates each block. However, it has been proposed that the nuts be screwed into the threaded portions at both ends thereof to tighten them. Further, each block is formed with step portions or unevenness on the upper and lower end surfaces which are in contact with each other at the time of stacking, and by engaging the stepped portions or unevenness with each other, the displacement of each block is prevented and the engaging step portion or For example, a sealing material is filled between the irregularities to stop the water.

[0005]

However, in order to connect each block with a steel rod or the like, it is necessary to form an insertion hole in each block in advance, which causes an increase in cost and also the insertion hole of each block. If the blocks are not in communication with each other, it is not possible to insert steel rods, etc., so precise stacking work of each block is a prerequisite. However, since each block is a heavy object, it is extremely difficult to perform precise work because it is hoisted with a crane or the like and gradually lowered into the underground hole to be piled up. Repetitive work such as moving left and right while moving in the air will reduce the work efficiency.

Further, the seal between the blocks is coated with a sealing material on the stepped portion or the unevenness. When the block is placed on it and the block is moved for position adjustment, etc. A part of the sealing material is peeled off, and the water-stopping effect of the site is lost, which is a problem.

Therefore, in view of the above circumstances, the present invention can omit the positioning work such as peeling off the sealing material, and can stack each block simply, quickly, easily and precisely,
Provide a concrete box-shaped manhole with improved construction efficiency.

[0008]

In the concrete box-shaped manhole according to the present invention, a plurality of box-shaped and / or tubular concrete blocks are stacked to form a water collecting box, and the manhole block is mounted on the top thereof. In a concrete box-shaped manhole, a guide pin having a tapered surface is projectingly provided on an upper end surface of the concrete block, and a guide hole having a tapered surface into which the guide pin is fitted should be stacked at a position corresponding to the guide pin. It is characterized in that it is formed on the lower end surface of the concrete block.

The guide pin and the guide hole are conical or polygonal pyramidal, or frusto-conical or truncated polygonal pyramidal.

[0010]

[Operation] When stacking concrete blocks, the guide pins formed on the upper end surface of the lower concrete block are aligned with the guide holes formed on the lower end surface of the suspended upper concrete block to form the upper and lower concrete blocks. If they are superposed, the tapered surfaces of the guide pin and the guide hole do the self-aligning action without the need for precise alignment in advance, and the precise alignment of the upper and lower concrete blocks can be performed, and the front and rear of the concrete block Prevents lateral shift.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, a box-shaped basic block 1 is provided at the bottom, and a pipe mounting block 2 is provided on the basic block 1.
, The middle slab block 3 is mounted on the pipe mounting block 2, the middle blocks 4 and 5 are mounted on the middle slab block 3, and the top plate block 6 is mounted on the middle block 5. Forming a large water collecting box, and a manhole 7 is connected to the top plate block 6.

The base block 1 and the pipe mounting block 2 are respectively formed with semicircular cutouts 9 for inserting the drainage pipe 8 on opposite side surfaces, and the base block 1, the pipe mounting block 2 and the intermediate block 4 are formed. Steps 10 are provided on the inner wall surfaces of 5 and 5 in a stepwise manner. Each block 1, 2,
As shown in FIG.
Is formed in a ring shape. A communication hole 3a is formed in the middle slab block 3, and a communication hole 6a that communicates with the manhole 7 is formed in the top slab block 6. A manhole 7 is formed by stacking a plurality of circular cylindrical blocks or a plurality of blocks at a predetermined height in accordance with the communication holes 6a. In addition,
The intermediate blocks 4 and 5 may or may not be present depending on the installation depth, and the intermediate floor slab 3 may or may not be present.

A step portion 12 having a lower inner peripheral side is formed in an annular shape on the upper end surfaces of the base block 1, the pipe mounting block 2, the intermediate floor slab block 3, and the intermediate blocks 4 and 5, and the pipe mounting block 2 and the middle floor are also formed. On the lower end surfaces of the plate block 3, the intermediate blocks 4 and 5, and the top plate block 6, a step portion 13 having a lower outer peripheral side is formed in an annular shape so that the step portions 12 and 13 can be engaged vertically. . A sealing material 14 is filled between the step portions 12 and 13 (see FIG. 5). As the sealing material 14, for example, a polyurethane-based, butyl-based or asphalt-based water-expandable sealing material is used.

Further, as shown in FIG. 5, guide holes 15 are formed in the four corners of the upper end faces of the base block 1, the pipe mounting block 2, the intermediate floor block 3, and the intermediate blocks 4 and 5, respectively. A guide pin 16 is inserted in the guide hole 15. The guide pin 16 is shown in FIG.
As shown in (A), it has a concentric tapered surface 17 in a shape in which two frustoconical bodies are joined at the bottom side, and is made of synthetic resin or the like.

Corresponding to the guide pin 16, a guide hole 18 is formed on the lower end surface of the pipe mounting block 2, the intermediate floor block 3, the intermediate blocks 4, 5 and the top block 6 as shown in FIG. Has been drilled. Therefore, the guide holes 15 and 18 are frustoconical and have a concentric tapered surface 19.

The shapes of the guide holes 15 and 18 and the guide pin 16 are not only the truncated cone shape, but also the shapes shown in FIG.
As shown in (D), a truncated polygonal pyramid-shaped guide pin 16a
Alternatively, the guide pin 16b may have a conical shape or the guide pin 16c may have a polygonal pyramid shape, and may have any centripetal tapered surface 17 if necessary.

If the guide pin 16 and the guide hole 18 are frusto-conical in shape, if the shape is a sharp cone or a polygonal pyramid, the sharp end is broken or an operator steps on it. The shape is formed in order to prevent danger, and therefore the shape may be a cone or a polygonal pyramid as long as the head is rounded to prevent the risk of breakage or injury.

Further, the guide pin 16 has a shape in which two frusto-conical bodies are joined at the bottom side, and also the guide hole 15
It is not always necessary for the portion to be buried in the same shape to have the same shape, but it may have a different shape. Further, the material of the guide pin 16 may be hard rubber, metal or stone other than synthetic resin. The setting positions of the guide pin 16 and the guide hole 18 are not limited to the four corners.

Therefore, when the pipe mounting block 2 is mounted on the basic block 1, the guide pin 16 gradually suspends the suspended pipe mounting block 2 on the upper surface of the basic block 1 as shown in FIG. First, the guide hole 18 formed on the lower end surface of the pipe mounting block 2 is lowered.
Is aligned with the guide pin 16 protruding from the base block 1, and the lower end surface of the pipe mounting block 2 is brought into contact with the upper end surface of the base block 1 in that state, the step portions 12 and 13 of both are properly engaged. .

That is, the guide hole 1 does not have to be precisely positioned between the basic block 1 and the pipe mounting block 2.
When 8 abuts on the guide pin 16, the guide pin 16
A slip for the fitting of the tapered surface 19 of the guide hole 18 occurs along the tapered surface 17 of the guide hole 18, and the pipe mounting block 2 is moved forward and backward and left and right.

Therefore, the guide pin 16 and the guide hole 18 perform a self-centering action on the tapered surfaces of the guide pin 16 and the guide hole 18, so that the foundation block 1 and the pipe mounting block 2 can be precisely stacked as desired. Step 12,
There is no possibility that the seal member 14 will come into contact with the sealing member 14 and peel off. Moreover, by fitting the guide pin 16 into the guide hole 18, the pipe mounting block 2 is prevented from moving to the left and right and back and forth on the base block 1.

When the step portions 12 and 13 are engaged in this way, the sealing material 14 applied to the step portion 12 is compressed and fills the space between the step portions 12 and 13, and the space between the step portions 12 and 13 is compressed. When water soaks into it, it expands and water is stopped from inside and outside.

Thus, by using the guide pin 16 and the guide hole 18, the positioning of each block during the stacking work becomes extremely easy, and therefore, the construction failure such that the step portion collides with each other and the sealing material peels off. It never happens.

[0024]

According to the present invention described above, by using the guide pin and the guide hole, the positioning of each block during the stacking work becomes simple, quick and easy, the working efficiency is improved, and the stepped portion is impacted. Since the construction failure such as peeling of the sealing material upon contact does not occur, the water blocking effect can be improved, and the stacked blocks can be prevented from shifting in the front, rear, left and right directions.

[Brief description of drawings]

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

FIG. 2 is a sectional side view showing an embodiment of the present invention.

FIG. 3 is a plan view showing an embodiment of the present invention.

FIG. 4 is a plan view of the concrete block according to the embodiment.

FIG. 5 is a cross-sectional view showing the relationship between the concrete blocks in the example.

6A to 6D are perspective views showing the shape of a guide pin.

FIG. 7 is an operation explanatory diagram.

[Explanation of reference symbols] 1 ... Foundation block (box-shaped concrete block) 2 ... Pipe mounting block 3 ... Mid-slab block 4, 5 ... Intermediate block 6 ... Top plate block 7 ... Manhole 8 ... Drain pipe 12, 13 ... Stage Part 14 ... Seal 15, 18 ... Guide hole 16 ... Guide pin 17, 19 ... Tapered surface

Claims (3)

[Claims] 1. A concrete box-shaped manhole in which a plurality of box-shaped and / or cylinder-shaped concrete blocks are stacked to form a water collecting box, and a manhole block is mounted on the top of the water-collecting box, and the upper end surface of the concrete block is tapered. A guide pin having a surface is projected, and a guide hole having a tapered surface into which the guide pin is fitted is formed on a lower end surface of a concrete block to be stacked at a position corresponding to the guide pin. A concrete box-shaped manhole. 2. The concrete box-shaped manhole according to claim 1, wherein the guide pin has a conical shape or a polygonal pyramid shape. 3. The concrete box-shaped manhole according to claim 1, wherein the guide pin has a truncated cone shape or a truncated polygonal pyramid shape.