JPH0776451B2 - Invert forming method and invert form - Google PatentsInvert forming method and invert form
- Publication number
- JPH0776451B2 JPH0776451B2 JP2246690A JP24669090A JPH0776451B2 JP H0776451 B2 JPH0776451 B2 JP H0776451B2 JP 2246690 A JP2246690 A JP 2246690A JP 24669090 A JP24669090 A JP 24669090A JP H0776451 B2 JPH0776451 B2 JP H0776451B2
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- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
- 239000011901 water Substances 0.000 claims description 27
- 210000003491 Skin Anatomy 0.000 claims description 25
- 239000008188 pellets Substances 0.000 claims description 23
- 238000009415 formwork Methods 0.000 claims description 14
- 239000000463 materials Substances 0.000 claims description 8
- 230000000875 corresponding Effects 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005755 formation reactions Methods 0.000 description 5
- 239000003570 air Substances 0.000 description 2
- 239000002243 precursors Substances 0.000 description 2
- 230000002940 repellent Effects 0.000 description 2
- 239000011347 resins Substances 0.000 description 2
- 229920005989 resins Polymers 0.000 description 2
- 102000010637 Aquaporins Human genes 0.000 description 1
- 108010063290 Aquaporins Proteins 0.000 description 1
- 241000287462 Phalacrocorax carbo Species 0.000 description 1
- 239000011324 beads Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000011162 core materials Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
TECHNICAL FIELD The present invention relates to a method for forming an invert formed on a bottom portion of a manhole for sewer and a formwork for the invert.
This type of invert is shown in FIG. 12 and FIG.
As shown in (H), it is formed at the bottom of the manhole, that is, inside the vehicle body 1 located at the bottom, and its invert 2 is connected from the pipe 3 on the inlet side to the pipe 4 on the outlet side. There is a water passage 5, and as shown in the figure, approximately eight kinds of water passages are formed depending on the connection position and the number of the pipes 3 on the inlet side. Then, such an invert 2 is located at the bottom of the manhole in a case where concrete is put on the bottom plate 1a of the manhole after forming the manhole and the invert 2 is formed while manually forming these water passages 5. In some cases, the invert 2 with the water passage 5 formed integrally with or separately from the vehicle body 1 or the bottom plate 1a is assembled and installed when the manhole is formed.
In the above-mentioned conventional example, the former manual inversion 2
It is difficult to form the slope and shape of the water passage 5 connecting the pipe 3 on the inlet side to the pipe 4 on the outlet side in an appropriate state, and not only does it require skill to perform the work. It has a problem that it takes a lot of labor and time. The latter, which is preassembled, does not require any skill to form the water passage 5 because the water passage 5 is formed in advance. However, regarding the assembling and installation of the invert 2, Depending on the connection position of the pipe 3 and the pipe 4 on the outlet side, not only the dimensional error but also the water passage 5 formed in the invert 2 in the height direction and the circumferential direction.
There is a case that the position of does not match, and it becomes practically impossible to assemble. In addition, if this is tried to be matched, it is necessary to prepare a large number of invars in which the inclination angle of the water passage and the positional relationship of the piping on the inlet side are subtly changed, which makes product management extremely difficult. There are also problems. Therefore, in the conventional example, even if the connection positions of the piping on the inlet side and the piping on the outlet side are different in the height direction or the circumferential direction, the water passage that connects them is accurately formed, and the inversion is performed. There is a problem that must be solved to simplify the formation of the.
As a specific means for solving the problems of the conventional example, the present invention stores a predetermined amount of pellets inside, and uses a flexible mold that can suppress the flow of the pellets by reducing the pressure inside to be rigid. Then, insert the end of the mold into the inlet and outlet of the manhole vehicle, decompress the inside of the mold to harden it, and then put a predetermined amount of concrete into the vehicle to cure it, After curing, the pressure reduction in the mold was released to remove the mold, and a method of forming an invert, and a flexible cylindrical outer cover corresponding to the shape of the invert water passage. Formed, and provided an airtight bag body containing a predetermined amount of pellets therein, an exhaust valve is connected to the bag body, the exhaust valve is exposed to the outside through the outer skin, The outer skin is made thicker than the bag body, and on the side of the outer skin It is intended to provide an invert formwork characterized by having a normal line and having an outer skin made of a water-repellent material or having a surface water-repellent processed. Not only it is possible to easily form an invert having an appropriate water passage without requiring, but the formwork is easy to handle, and the positional relationship between the inlet and the outlet is slightly different from the planned position. Even if it doesn't depend on it,
It is possible to accurately form an invert having an appropriate water passage.
The invention will now be described in more detail with reference to the illustrated embodiment.
To facilitate understanding, the same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. In the first embodiment shown in FIGS. 1 to 4, 10 is a mold, which is a substantially tubular outer skin 11 and a tubular bag 12 disposed inside thereof.
And a pellet 3 housed in the bag body. An exhaust valve 14 with a check valve is attached to the bag body 12, and the exhaust valve penetrates the outer skin 11 and projects to the outside. . A reference line 15 for invert formation is provided on both sides of the outer cover 11 on both sides. The outer cover 11 and the bag body 12 are formed of a flexible material such as rubber or resin, and the outer cover 11 is thicker than the bag body 12, and is preferably formed of a water repellent material, or It is better to give the surface a water repellent finish. The bag body 12 is thin and has high flexibility, and is formed so as to follow the shape of the outer cover 11. In addition, the outer skin 11 and the bag body 12 may be partially adhered linearly in the longitudinal direction, for example, on a surface facing the exhaust valve 14. The pellet 13 is made of resin having a diameter of about 0.5 to 7 mm, but sand or the like can be used if the weight is ignored. Needless to say, for example, beads or hollow pellets can be used as the type of pellets, but in consideration of ease of carrying and handling, it is better to use foamable pellets for weight reduction. Then, an appropriate amount is stored so that it can flow into the bag body 12.
In this case, it is better to divide the inside of the bag body 12 into a plurality of chambers by a breathable material so that the flow of the pellets 13 does not become remarkable. The second to fifth embodiments shown in FIGS. 5 to 8 correspond to the shapes of the water passages 5 formed in the inverts 2, respectively,
In the second embodiment, the outer skin 11 is formed in an arc shape in advance to form the mold 10, but the linear shape of the first embodiment is curved in an arc shape when used. You can also do it. In the third embodiment, the outer skin 11 is branched or branched to form a mold 10 having a branch portion 11a. In the fourth embodiment, the outer skin 1 is formed.
1 is formed in a substantially Y shape to form a mold 10 having branch portions 11a and 11b, and in the fifth embodiment, a mold 10 having branch portions 11a and 11b by branching or branching the outer skin 11 to the left and right. In any of the embodiments, as in the first embodiment, the bag body 12 and the pellet 13 corresponding to the respective shapes are housed therein, the exhaust valve 14 is provided, and the outer skin is formed. 11
A reference line 15 is provided on both sides of the. In the third embodiment, the branch or branch is shown on the right side, but the same applies when the branch portion is formed by branching or branching on the left side. Next, a method of forming the invert 2 using the above-described mold 10 will be described. First of all, when the manhole is formed, the pipe 3 on the inlet side and the pipe 4 on the outlet side are naturally connected to predetermined positions in the vehicle body 1 located at the bottom thereof. For example, as shown in FIG. 9, the piping 3 on the inlet side
When the pipe 4 on the outlet side and the pipe 4 on the outlet side are connected at symmetrical positions, the mold 10 of the first embodiment is used, and the ends of the form are used as the inlet and the outlet of both pipes, respectively. Plug it in and position it
By connecting an appropriate suction pump to the exhaust valve 14 and exhausting the air inside the respective 12, the pellets 13 housed inside become passive and become a rigid core material,
The shape of the outer skin 11 is maintained. In this state, even if the suction pump is disconnected, the inside of the bag body 12 can be maintained in a reduced pressure state by the action of the check valve, so that the rigid state can be maintained as it is. In addition, the surface of the bag 12 is reduced by depressurizing the inside.
Pellets 13 create some unevenness, but the outer skin 11
Since it is formed thick, the unevenness does not transfer to the surface of the outer skin 11. In this state, inside the manhole, that is, the precursor 1 and the mold 10
A predetermined amount of concrete is put between and, and by stroking the concrete at a position corresponding to the reference line 15 of the form 10, the upper surface of the invert 2 is formed, and after leaving it as it is to cure the concrete, The exhaust valve 14
When the check valve is opened and air is introduced into the bag body 12, the rigid state is released and the pellet 13 is allowed to freely flow, and the mold can be easily deformed. Also, if it is taken out from the outflow port, the invert 2 with a water passage corresponding to the form 10 can be formed. What is shown in FIG. 10 is a case where the pipe 3 on the inlet side and the pipe 4 on the outlet side are connected to each other at a substantially right angle,
The mold 10 of the second embodiment is used. Also in this case, the end of the formwork is inserted into the inflow port and the outflow port in the same manner as in the above-mentioned embodiment, the inside is decompressed to be rigid, and the shape of the outer cover 11 is maintained in a stable state, and then the same concrete is used as described above. It is thrown in and the invert 2 is formed. Furthermore, as shown in FIG. 11, the two pipes 3 on the inlet side are provided.
Is connected at a substantially right angle position and one pipe 4 on the outlet side is connected, and the mold 10 of the third embodiment is used. Even in this case, if the branch portion 11a is inserted into the other inflow port and the invert 2 is formed in the same manner as described above,
A water passage corresponding to the shape of the mold is formed on the upper surface of the invert. The same applies to the fourth and fifth embodiments. In any case, since the formwork 10 itself is flexible, even if there is a slight deviation in the connection position between the inlet side pipe 3 and the outlet side pipe 4 with respect to the precursor 1, The invert with an appropriate water passage connecting them can be formed easily without requiring any skill, without being influenced.
As described above, the method for forming an invert according to the present invention uses a flexible mold that can store a predetermined amount of pellets inside and suppress the flow of the pellets by depressurizing the inside to make the pellets rigid. Then, the ends of the formwork were inserted into the inflow port and the outflow port of the manhole body, and the interior of the formwork was decompressed and hardened, and then a predetermined amount of concrete was put into the body and cured. As a result, it is not only possible to form a manhole at the construction site by hand, but it is much more workable and can be formed properly and accurately without requiring skill. Unlike the case of incorporating the installed invert, it is possible to eliminate the trouble of management such as preparing various kinds of inverts without any difficulty in aligning the water passage with the inflow and outflow ports. Cormorant an excellent effect. In addition, the flexible mold can be deformed by releasing the reduced pressure in the mold after the concrete is hardened, and the mold can be easily removed, and the mold along the mold can be easily removed. It also has an excellent effect that the water channel can be accurately formed. Further, the invert form according to the present invention is a hermetically sealed bag body in which a flexible cylindrical outer skin is formed corresponding to the shape of the water passage of the invert, and a predetermined amount of pellets is stored inside thereof. The exhaust valve is connected to the bag body, and the exhaust valve penetrates the outer cover to be exposed to the outside. It is possible to maintain the shape as a rigid material by inserting it into the inflow port and the outflow port and positioning it in the shape of the water passage that is to be formed, and reducing the pressure inside via the exhaust valve. Even if the positional relationship of is slightly displaced from the planned position, it can be arranged without being affected by it,
It is easy to handle, and has an excellent effect that an invert having an appropriate water passage can be accurately formed easily without adding skill by only adding concrete and stroking it. Furthermore, by forming the outer skin thicker than the bag,
Even if the bag is depressurized and its surface becomes uneven due to pellets, the unevenness is not transferred to the surface of the outer skin, the water passage is formed smoothly, and a reference line is provided on the side surface of the outer cover to make the concrete It is possible to grasp the input amount and the surface height of the invert. Furthermore, the outer skin is made of a water-repellent material or the surface is made water-repellent so that the mold release after hardening of the concrete is easy. It has various excellent effects.
FIG. 1 is a plan view of an inverting formwork of the first embodiment according to the present invention, FIG. 2 is a perspective view of the same formwork, and FIG. 3 is II of FIG.
An enlarged cross-sectional view taken along the line I-III, FIG. 4 is an enlarged cross-sectional view similar to FIG. 3 in a state where the inside is depressurized, and FIG. 5 is a plan view of the invert form of the second embodiment, FIG. Is a plan view of the invert form of the third embodiment, FIG. 7 is a plan view of the invert form of the fourth embodiment, FIG. 8 is a plan view of the invert form of the fifth embodiment, and FIG. The figure is a schematic plan view for explaining the formation state of the invert using the inversion formwork of the first embodiment, and FIG. 10 shows the formation state of the invert using the inversion formwork of the second embodiment. Fig. 11 is a schematic plan view for explaining, Fig. 11 is a schematic plan view for explaining the formation situation of the invert using the invert form of the third embodiment, and Fig. 12 is a general invert. Partial cross-sectional views of the manholes shown in Figures 13 (A)-(H) show the types of water passages in general inverts. It is to substantially expressly plan view. 1 ... Vehicle located at the bottom of manhole 1a ... bottom plate 2 ... invert 3 ... inlet side piping 4 ... outlet side piping 5 ... water passage 10 ... formwork, 11 ... skin 11a , 11b… 12… bag, 13… pellet 14… exhaust valve, 15… reference line
Alternatively, the invert formwork according to (4).
Priority Applications (1)
|Application Number||Priority Date||Filing Date||Title|
|JP2246690A JPH0776451B2 (en)||1990-09-17||1990-09-17||Invert forming method and invert form|
Applications Claiming Priority (1)
|Application Number||Priority Date||Filing Date||Title|
|JP2246690A JPH0776451B2 (en)||1990-09-17||1990-09-17||Invert forming method and invert form|
|Publication Number||Publication Date|
|JPH04124322A JPH04124322A (en)||1992-04-24|
|JPH0776451B2 true JPH0776451B2 (en)||1995-08-16|
Family Applications (1)
|Application Number||Title||Priority Date||Filing Date|
|JP2246690A Expired - Lifetime JPH0776451B2 (en)||1990-09-17||1990-09-17||Invert forming method and invert form|
Country Status (1)
|JP (1)||JPH0776451B2 (en)|
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- 1990-09-17 JP JP2246690A patent/JPH0776451B2/en not_active Expired - Lifetime
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