JPH0686738B2 - Manhole construction method and manhole waterway formation formwork - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for constructing a manhole and a formwork for forming a conduit for a manhole, and more specifically, to a manhole capable of easily forming a conduit for the bottom of a manhole. The present invention relates to a construction method and a formwork for forming a conduit for a manhole.

(Prior art and its problems) A manhole is provided in the middle of the drainage pipe for inspection and cleaning.

Therefore, the direction of the sewer pipe is changed in the manhole part. The bending angle is determined in advance at the time of design, but it is a difficult task because it slightly changes during construction. Therefore, it is difficult to preliminarily form the water conduit on the bottom plate of the manhole, because it requires many kinds of products and molds and enormous cost. Therefore, it is absolutely necessary to carry out construction at the site according to the site.

And, in the case where the headrace with a semicircular cross section is a straight line,
For example, it can be easily formed by striking concrete using a vinyl chloride pipe or the like as a mold, and removing the vinyl chloride pipe after hardening the concrete. However, if a vibrator or the like is used, the vinyl chloride pipe will float, and then it will be necessary to finish it by ironing.

In addition, as described above, enormous cost is required and a slight difference in angle is extremely difficult to form the water conduit in a plane L shape, T shape, and cross shape in advance on the bottom surface of the manhole. . For this reason, it relies on manual work of ironing by hand, but in reality it requires a lot of labor.

Further, when forming the water conduit, it is preferable to mold the concrete with high strength, but if pebbles or the like are contained in the trowel for manual trowel finishing, the finishing accuracy will decrease. Therefore, the mortar is used for the construction, but even if the mortar is soft, the groove will be dull if the mortar is soft. Therefore, dry dry mortar is used. As a result, there is a problem with durability, and repair is required in a short period of time.

Further, since the manhole is narrow and the workability is poor, and the scaffolding cannot be made in the manhole, the worker must work in an unnatural appearance, which is heavy labor.

Therefore, an object of the present invention is to provide a manhole construction method capable of easily constructing a manhole having a water conduit having excellent durability, and a manhole conduit forming frame.

(Means for Solving Problems) The present invention has the following configuration in order to solve the above problems.

That is, as a method of constructing a manhole, in order to form a concave water conduit that connects the inlet and the outlet at the inner bottom of the manhole that has the inlet and the outlet on the outer wall, The lower half of the outlet is connected by a bendable rod-shaped mold body, and the mold body and the inner wall surface of the manhole are connected by a fixture to position and fix the mold body, and the upper surface of the mold body While placing mortar or concrete around the part except for the part, the operator puts his foot on the formwork and trowels the bottom of the manhole with mortar or concrete to cure the mortar or concrete. It is characterized in that the frame body is removed to form a concave water conduit.

On the other hand, as a form for forming a water conduit for a manhole, a concave water conduit that connects the lower half of the inlet and the lower half of the outlet should be formed on the inner bottom of the manhole that has an inlet and an outlet on the outer wall. , In the manhole headway forming frame, which is formed into a bendable rod shape, and has both ends inserted into the inlet and outlet of the manhole, respectively, to form a space for placing mortar or concrete around, When both ends are respectively inserted into the inflow port and the discharge port, the mold body located in the manhole is located at a predetermined position in the manhole, and the mold is constructed to support the mold body so that an operator can hang it. It is characterized by comprising a plurality of fixtures, one end of which can be fixed to the upper surface of the frame and the other end of which can be fixed to the inner wall surface of the manhole.

(Embodiment) A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a perspective view of the mold body. FIG. 2 shows a vertical sectional view of the manhole.

Crushed stones 12 are lined up at the bottom 10a of the hole 10 for manholes.
The mortar is laid horizontally on top, and the bottom plate block 14 is installed on this, and the cylindrical skeleton block is placed on this bottom plate block 14.
16 are mounted. Further, a straight wall block 18 is placed on the skeleton block 16, and a slanted wall block 20 is further placed on the straight wall block 18.

On the other hand, an inflow port 16a and a discharge port 16b are formed in the wall surface of the frame block 16. The lower half of this inlet 16a and the outlet 16b
The headrace that connects the lower half is not straight, but rather curved. The water conduit 21 is formed of mortar on the bottom plate block 14.

Reference numeral 22 is a bendable mold body having a round bar shape. A flat surface portion 24 is formed in the central portion of the upper portion of the mold frame 22 so as to be cut out, and a bolt 26 is projectingly provided on the flat surface portion 24. Further, a through hole 28 is formed at the center of the flat surface portion 24.

Further, an inflow pipe and a discharge pipe are connected to the inflow port 16a and the exhaust port 16b of the body block 16, respectively.

On the other hand, the frame body 22 is for fixing both ends by inserting the both ends into the inflow port 16a and the discharge port 16b, bending and deforming the mold frame 22 into a predetermined shape using the fixture 30, and positioning. . The state is shown in FIGS. 3 and 4. That is, the mold 22 and the fixture 30 constitute a water conduit forming mold, and FIG. 3 is a cross-sectional explanatory view showing a state in which the mold 22 is held by the fixture 30, Figure 4 shows a fixture
It is explanatory drawing which shows the state which positions using 30.

Here, the fixture 30 will be described.

The fixture 30 is formed by combining two slide rods 32a and 32b so that the entire length can be expanded and contracted. For example, a part of both the slide rods 32a and 32b are overlapped with each other, and a plurality of holes penetrating the wall surface in the stacking direction are formed in the overlapped portions. And the slide rod
When the holes of 32a and the slide rod 32b are aligned,
Penetrate 33 to determine the total length (see Figure 5). The slide rods 32a and 32b may be engaged with each other by a slide mechanism that allows the entire slide rods 32a and 32b to expand and contract.

A screwing portion 34 that is screwed into the bolt 26 is swingably and rotatably provided at the tip of one slide rod 32a. Further, a bolt member 38 that is screwed into a nut 36 embedded in the inner wall surface of the body block 16 is also provided at the tip of the other slide 32b so as to be swingable and rotatable.

The screwed portion 34 and the bolt member 38 may be fixed at a tilted position with a wing nut or the like. Further, the nut 36 is embedded in the inner wall surface of the body block 16 to fix one end of the fixture 30, but instead of the nut, a bolt is embedded, and the nut can be rocked at one end of the fixture 30 corresponding to this. Also, it may be rotatably provided.

Further, a structure for fixing the formwork 22 to the bottom plate block 14 via a member will be described with reference to FIG.

A hole 28 is formed in the center of the mold body 22, a support plate 28a is fixed to the opening position of the lower surface of the hole 28, and a through hole 28b is formed in the center of the support plate 28a. On the other hand, a bolt 42 is swingably provided at the other end of the support rod 40 whose one end is fixed to the bottom plate block 14. Then, the bolt 42 is passed through the through hole 28b and screwed and fixed from above the hole 28 by a holding rod 46 having a nut portion 44.

FIG. 7 shows the internal structure of the mold body. A plurality of block members 50 are connected in series inside the mold body 22. The side surfaces of the plurality of block members 50 in the connecting direction are formed into convex curved surfaces, and the side surfaces are formed with connecting holes 52 each having a narrow opening and a wide interior. On the other hand, enlarged portions 54a are formed at both ends of the rod-shaped connecting member 54, and the enlarged portions 54a of the connecting member 54 are loosely fitted in the connecting holes 52 to form a long core material 56 by the plurality of block members 50. . Therefore, the core material 56 can be bent as a whole. The core material 56 is entirely covered with a flexible cover 58 such as rubber.

The entire mold frame 22 may be formed of flexible rubber, synthetic resin, or the like.

Next, the procedure for forming the water conduit 21 on the manhole bottom plate block 14 of the present invention will be described.

As described above, the manhole hole 10 is dug in the ground, the stones 12 are arranged on the bottom 10a of the hole 10, the mortar is laid horizontally on the stone 12, and the bottom plate block 14 is placed on the mortar. Then, the tubular frame block 16 is placed on the bottom plate block 14, the straight wall block 18 is placed on the frame block 16, and the slant wall block 20 is further placed on the straight wall block 18.

On the other hand, an inflow port 16a and a discharge port 16b are bored on the wall surface of the skeleton block 16 (the water conduit formed by connecting the inflow port 16a and the discharge port 16b is not a plane straight line but slightly curved). The mold frame 22 is inserted into the inflow port 16a and the discharge port 16b while deforming both ends thereof.

Then, the mold body 22 is bent and deformed into a predetermined shape by the fixture 30 and fixed. Screw part 34 at the tip of one slide rod 32a
Is screwed to the bolt 26, and the bolt material 38 at the tip of the other slide 32b is screwed to the nut 36 embedded in the inner wall surface of the body block 16. Then, the entire length of the slide rod 32a and the slide rod 32b is adjusted. Similarly, the mold body 22 is positioned by some fixtures 30.

On the other hand, a hole 28 is formed in the center of the mold body 22, but the bolt 42 at the other end of the support rod 40 fixed to the bottom plate block 14 is provided in the hole 28.
It is positioned inside, and the nut portion 44 of the holding rod 46 is screwed into the bolt 42 to fix the frame 22 in a bow shape.

Then pour the concrete into the bottom of the manhole,
The bottom is formed by using a vibrator or the like. In addition,
The upper surface of this mortar must be formed so as to incline and descend toward the water conduit 21, and is molded by the operator. However, an operator can put his / her foot on the formwork 22, and the work is easy.

After that, when the mortar is solidified, the fixture 30 is removed and the holding rod 46 is removed. Then, the formwork body 22 is bent and extracted to form the water conduit 21.

In addition, depending on the location of the manhole, it is necessary that the planar shape of the water conduit is L-shaped, T-shaped, or cross-shaped. Therefore, by using a mold body whose planar shape is an L-shape, T-shape and cross-shape as a basic shape, it is possible to appropriately bend and deform it so that it can be applied to any place. For example, when the planar shape of the water conduit is T-shaped, the mold body has a branched shape as shown in FIGS. 8 (a) and 8 (b).
22 may be used, and when the planar shape of the water conduit is a cross shape, a mold frame 22 having a shape as shown in (c) may be used. Some formwork 22 with such basic shapes
By preparing, it is possible to deal with various sites.

Furthermore, by making a part of the mold body 22 separable,
It can also be used when the diameter of the inlet or outlet is large. That is, when used for a manhole or the like having a large diameter of the inflow port or the exhaust port, the bending range is restricted, and it is difficult to insert and pull out the tip end of the formwork 22 into the inflow port 16a and the exhaust port 16b. Therefore, by making the mold body 22 separable in the middle, it can be used for a manhole or the like having a large diameter of the inflow port or the exhaust port, and the work is further facilitated.

FIG. 9 shows an embodiment in which the formwork 22 can be cut. It is possible to cut the middle part of the flat surface portion 24 of the mold body 22 similar to the above,
Two bolts 27 are provided along each cutting edge 24a. When the cut frame members 22 are connected, they are connected by a fixed frame 60 formed in a frame shape. Engaging cylinders 62 are arranged at four corners of the fixed frame 60, and a connecting rod 64 is provided.
The engaging cylinders 62 are connected by. Then, the bolts 27 are passed through the engagement cylinders 62 of the fixed frame 60, and the nuts 66 are screwed onto the tips of the bolts 27 protruding from the engagement cylinders 62 to form the frame body.
Connect 22.

The method of connecting the cut mold bodies 22 is not limited to the above method, and instead of the fixed frame 60, a plate body having four holes formed therein may be used. Further, various changes such as concavo-convex connection of the divided mold bodies can be made.

Furthermore, in the above-mentioned embodiment, since the bottom portion is formed by applying a vibration by the vibrator using a bendable mold body, it is possible to form using not only mortar close to kneading but also concrete. is there. Therefore, it has excellent strength and durability.

Although various descriptions have been given above with reference to the preferred embodiments of the present invention, it goes without saying that the present invention is not limited to the above-mentioned embodiments, and the point is that the mold frame may be bendable, etc. Of course, many modifications can be made without departing from the spirit of the invention.

(Effects of the Invention) As described above, according to the present invention, in order to form a water conduit for a manhole, the manhole inlet and outlet are connected by a bendable rod-shaped mold body, and a mold is used by a fixture. Since the frame body is fixed in the manhole, an operator can put a foot on the formwork body and trowel the bottom of the manhole with mortar or concrete.

It can also be used as a scaffold for workers by fixing the formwork for the headrace with a fixture in a manhole, where the workability is narrow and the scaffolding cannot be made, as in the past. It has a remarkable effect such that iron finishing can be easily performed.

[Brief description of drawings]

FIG. 1 is a perspective view of a mold frame, FIG. 2 is a vertical cross-sectional view of a manhole, FIG. 3 is a cross-sectional explanatory view showing a held state of the mold frame, and FIG. 4 is a positioning using a fixture. Fig. 5 is an explanatory view showing a state, Fig. 5 is a partial perspective view showing a connecting structure of a slide rod, Fig. 6 is a sectional view of an essential part showing a connecting structure of a mold body and a bottom plate block, and Fig. 7 is an inside of the mold body. 8 (a) to 8 (C) are plan views showing a branched mold body, and FIG. 9 is a partial perspective view of the mold body which is divisible. Show. 10 …… Manhole hole, 12 …… Kuriishi, 14 …… Bottom plate block, 16 …… Body block, 18 …… Straight wall block, 20 …… Slanting wall block, 22 …… Form frame, 24 …… Flat part , 26 …… Bolt, 30 …… Fixture, 36 …… Core material.

Claims (2)

[Claims] 1. A lower half of an inlet and a lower half of an outlet of a manhole for forming a concave water conduit that connects the inlet and the outlet at an inner bottom of a manhole having an inlet and an outlet on an outer wall. The space is connected by a bendable rod-shaped mold body, the mold body and the manhole inner wall surface are connected by a fixture to position and fix the mold body, and except the upper surface of the mold body. While placing mortar or concrete around, workers put their feet on the formwork to trowel the bottom of the manhole with mortar or concrete, and after the mortar or concrete hardens, remove the formwork. A method of constructing a manhole, characterized by forming a concave water conduit. 2. A mandrel having an inflow port and a discharge port on its outer wall, and formed in a bendable rod shape to form a concave water conduit connecting the lower half of the inflow port and the lower half of the exhaust port at the inner bottom of the manhole. At the same time, both ends are respectively inserted into the inlet and outlet of the manhole to form a space for placing mortar or concrete around it. When inserted respectively, the mold body located in the manhole is located at a predetermined position in the manhole, and one end can be fixed to the upper surface of the mold body so that the operator can support the mold body so that the operator can hang it. A formwork for forming a water conduit for a manhole, wherein the other end is provided with a plurality of fixtures that can be fixed to the inner wall surface of the manhole.