JPH0696875B2 - Installation method of invert joint in sewer manhole on road - Google Patents

Description

The present invention relates to a method for installing an invert joint in a sewage manhole for roads.

<Prior art> Generally, the sewer system generally consists of two systems, a dirty water system and a rainwater system, and the former targets miscellaneous drainage water and manure from each household and other living areas, and guides it to a river etc. The latter is a drainage system that targets relatively clean rainwater and leads to rivers through a reservoir, and the two systems are distinguished.

The sewage discharged from kitchens and toilets of ordinary households flows from the small pipes installed around each building toward the residential basin → branch line → main line → main line → purification plant, but is purified from the branch line. A manhole will be buried in the middle of the pipeline leading to the plant, and is used for maintenance, inspection and cleaning of the pipeline and direction change of water flow.

The distance between adjacent manholes varies, but the diameter is about 600 mm for the manhole on the branch line,
The main manhole is about 900mm, and it gets bigger as it gets closer to the purification plant. In addition, the depth gradually increases from about 1m underground to the downstream side while maintaining the slope gradient.

At the bottom of such a manhole, an invert joint for connecting the inflow pipe and the outflow pipe of the sewage to each other is installed, but this is conventionally done by a worker after backfilling after completion of the manhole. It is customary to go inside the building and shape it in-situ and in a craftsman's way. Although it is desirable to perform the construction during construction of the manhole, which is originally treated with water by a pump or the like, the scaffolding is bad during construction and it cannot be approached by workers, and therefore there are the following problems.

<Problems to be Solved by the Invention> That is, firstly, a manhole is buried in a laminated state having a plurality of body walls and a bottom wall as an assembly element, and furthermore, a sewage inflow pipe line and an outflow pipe line are also connected thereto. Since it is already piped, water easily intrudes from the opening and closing lid, the joint of the body wall, the joint with both pipelines, the upstream side where the residential lot is located, etc., and dew condensation also flows out, and the manhole The inside has been exposed to water from the beginning of the new construction. In addition, until the road paving work is completed, earth and sand easily fall into the manhole, which mixes with the above-mentioned infiltrated water and forms colloidal mud that accumulates at the bottom.

As a result, it is extremely difficult to clean and stop the water inside the manhole necessary for the construction of the invert joint, and if the water is not completely stopped, the mortar for molding the invert joint will lose its shape. Become. In this respect, even when using underwater cement, the solidification time is as short as about 5 to 10 minutes, so it can be said that it is impossible to complete the work during that time, and it is possible to obtain a highly accurate modeling state. Can not.

Also, since the work environment is in a narrow manhole with poor footing, workers must take a rest and sometimes escape to the outside of the manhole, which requires a long time and heavy labor, especially in a place where traffic is crowded. The construction of the road will also delay the opening of the road.

Secondly, since it is a construction method in which the worker forms an invert joint by clay modeling, the invert joint is constructed according to the planar arrangement of the inflow pipe and the outflow pipe connected to the manhole. Although it has the advantage that it can be modeled flexibly, it is extremely difficult to quickly and firmly model and construct it under the above-mentioned environmental conditions, and it requires a large amount of cost as a whole including the above-mentioned water stop treatment, There is also a shortage of craftsmen with skill and extensive experience.

Furthermore, even if it takes a tentatively long time to perform high-precision molding, the mortar is not cured normally and the durability strength is lowered because it is exposed to the above-mentioned infiltration water immediately after its completion.

In order to improve such a problem, it has been proposed that the flow path functioning as an invert joint is integrally formed in the upper surface of the bottom plate which is an assembly element of the manhole, but this is the joint It is difficult to correctly match the path with the above-mentioned inflow line and outflow line, and the flexibility is poor or the product compatibility is poor. And, as a variety of this according to the planar arrangement of the inflow conduit and the outflow conduit,
Even if many kinds of products are prepared in advance, this is extremely expensive because it is integrated with the bottom plate of the manhole.

In addition, if the bottom plate of the manhole is buried first, and the inflow pipe and the outflow pipe are connected to each other by using a laser beam so that the bottom plate of the manhole can be matched and communicated with the joint, the bottom plate is said to be the same. As a result, it is impossible to install the necessary equipment in the way, and it is also impossible to properly connect the inflow pipe and the outflow pipe in a straight line on the connecting pipe with the adjacent manholes.

In this respect, according to the known invention disclosed in Japanese Utility Model Laid-Open No. Sho 62-120541, the manhole bottom block (6) is provided with an annular groove (6a), which is a flexible modification of the above product.・ Excellent compatibility. However, in this case, since the annular groove (6a) and the inclined groove (7) partitioning the annular groove sharply intersect each other at less than 90 degrees in a plan view, anyway, if rainwater is targeted,
When applied to sewage containing manure or other solid matter, the solid matter inevitably adheres to and accumulates on the intersections and the convex curved surface (6b), and does not flow smoothly.

Furthermore, since the bottom block (6) is a large disk that corresponds to the bottom wall (11) of the manhole, it cannot be easily brought into the existing manhole, and it is installed at the same time as the construction of the manhole. In that case, it is not possible to use the laser beam to connect the adjacent manholes with each other.

On the other hand, as an invert joint for a sewer manhole, a synthetic resin product has been proposed in Japanese Utility Model Laid-Open No. 59-10390. According to this, even one operator can easily install an invert joint into an existing manhole. It can be said that there is an advantage that can be brought in.

However, since it is a molded product of synthetic resin, it is necessary to apply special sanding processing etc. to prevent peeling and water leakage that occur at the interface of its non-affinity state, without being compatible with mortar and concrete on installation. It is also impossible for a worker to ride on the invert joint and to put mortar or concrete in the manhole.

Moreover, the length of the invert portion (5) formed from the folded edge (9) of the tubular body (2) is approximately equal to the diameter of the manhole (6), and the tubular body (2) is
Since both ends of the plug are installed by inserting them into the manhole (6) as the receiving port (3) and the outlet (4), when connecting the sewage inflow pipe and the outflow pipe in a straight flow path form, Limited, if there is a level difference in both pipelines, or if a curved flow path form is formed, it can no longer be dealt with, it is impossible to implement it, and compatibility with existing manholes and flexibility are inferior .

<Means for Solving the Problem> The present invention intends to improve such problems, and therefore, as a method for installing an invert joint in a sewage manhole on a road, firstly, an overall method for an operator to ride is provided. As a gutter-shaped concrete block, the plan shape of which is a straight flow path form that should connect the sewage inflow and outflow lines of a manhole, or a curved flow path that bends in a smooth arc shape of 90 degrees or more Or, in addition to modeling in a flow path form where the straight line and the curved line meet, prepare several types of invert joints that are formed by giving the upper edge of the gutter-shaped concrete block a downward slope of a certain angle. While placing a mortar or ready-mixed concrete base on the bottom of the manhole and selecting and using an invert joint that can connect the sewage inflow and outflow pipes, As enshrined that an open end portions of Bad joint corresponds matches the inflow conduit and the outflow conduit, along with installing from the top to the base,
After jointing the joint with the manhole and fixing the invert joint by hardening the base, ride on the invert joint to fill the gap in the manhole partitioned by this, mortar from above the base or The enveloping layer for the invert joint of green concrete is placed in a state where the upper surface is a substantially conical concave curved surface, and then the ridge line protruding to the upper edge of the invert joint is used as a plaster ruler from above the encapsulating layer. The finishing layer of mortar is characterized in that the upper surface of the mortar is also a conical concave curved surface and the upper edge of the invert joint is covered and coated. As a block, the plane shape of which is a straight flow path that should connect the sewage inflow pipe and the outflow pipe of the manhole, or a slip of 90 degrees or more A curved flow path that bends in a circular arc shape, or a flow path that intersects with a straight line and a curved line, and at the same time, give the outer edge of the gutter-shaped concrete block a certain downward slope. Prepare several types of invert joints, and first place a mortar or ready-mixed concrete base on the bottom of the manhole, and select and use an invert joint that can connect the sewage inflow pipe and the outflow pipe. At the same time, the both ends of the opening of the invert joint are installed in the base from above so that the inlet and outlet pipes are in conformity with each other, and joints with the manhole are jointed to harden the base. During the time, the above-mentioned invert joint is kept fixed by pressing it from above by the fixing bar of the presser bar that is laid across the sewage inflow pipe and the outflow pipe of the manhole. After fixing the invert joint by hardening the base, to fill the gap in the manhole partitioned by this, board the invert joint, and use the ridge line protruding to the upper edge of the invert joint as a left ruler from above the base. A mortar or ready-mixed concrete enveloping layer / finishing layer for invert joints is characterized in that the upper surface thereof has a substantially conical concave curved surface and the upper end edge of the invert joint is covered and coated. As an overall gutter-shaped concrete block that can ride on, and its planar shape is a straight flow path form that should connect the sewage inflow pipe and the outflow pipe of the manhole, or bends in a smooth arc shape of 90 degrees or more In addition to forming a curved flow path or a flow path in which the straight line and the curve meet, the outer edge of the gutter-shaped concrete block has a fixed angle on the upper edge. Prepare several types of invert joints that are provided with a steep slope, and first place the base of underwater cement or cement-based underwater bond that is solidified by water at the bottom of the above manhole in a scattered dumpling state. Then, while selecting and using an invert joint that can communicate with the sewage inflow pipe and the outflow pipe, the above-mentioned base is placed as an erected state in which both ends of the opening of the invert joint correspond to the inflow pipe and the outflow pipe. While installing from above, joints with the manhole are jointed, and after fixing the invert joint by hardening the above-mentioned base, the gap in the manhole partitioned by this and adjacent mutual gaps of the above-mentioned scattered bases For filling, board the invert joint, and from above the base, insert a mortar or ready-mixed concrete inclusion layer for the invert joint into the invert joint. Toilet pipes are piled up from one of the left and right sides to the other one by one, so that the water is pushed toward the other side and floated up and transferred into the invert joint, and the outflow pipe is passed through the invert joint. Drive from the road to the outside of the manhole, and then use the ridge line that rises at the upper edge of the invert joint as a plaster ruler, and from the upper part of the entrapment layer, the finishing layer of mortar, the upper surface of which is a substantially conical concave curved surface and of the invert joint. It is characterized in that the upper edge portion is painted so as to be covered and applied.

<Examples> Hereinafter, the details of the present invention will be described with reference to the drawings.
FIG. 5 shows a basic embodiment of an invert joint according to the present invention and two types of installation states thereof. (M) is a sewage manhole buried in a road, and is a multi-layered stack as is well known. A body wall (11) assembled and integrated in a state, an elevating step (12) and an opening / closing lid (13) inside the body wall (11). (14) is the bottom plate of the manhole (M), (15) is crushed foundation stone, (16) (17) is the inflow and outflow lines of sewage that are connected to the body wall (11) of the manhole (M). Yes, there are various changes in the number of inflow conduits (16) and the overall planar arrangement of both conduits (16) (17), but in any case, sewage flows from the inflow conduit (16) to the outflow conduit. Needless to say, a certain level difference is provided between the two pipes (16) and (17) so that the pipe can smoothly flow to the pipe (17).

In this regard, when the height difference between the inflow conduit (16) and the outflow conduit (17) is very large, the manure and other solid waste contained in the sewage are discharged from the inflow conduit (16) into the manhole. Since there is a risk of concentrated accumulation / accumulation at the drop position inside (M), the elbow type inflow auxiliary conduit (18) as shown in FIG. The pipe and the lower part of the inflow pipe (16) are separately inserted and connected so as to be connected in a branched manner. However, there is no difference in that a certain level difference is provided also between the upstream side sub-pipe (18) and the downstream side outflow pipe (17).

(A) is an invert joint of the present invention, which is a secondary concrete product independent of the manhole (M),
It is formed into an overall gutter-shaped block with a semicircular cross section on which an operator can ride. The inflow conduit (16) and its subsidiary conduit (1)
It will be installed in the manhole (M) to connect the 8) and the outflow pipe (17).

For this reason, the length (L) of the invert joint (A) is dimensioned to be slightly shorter than the mutual distance between the inflow conduit (16) and the outflow conduit (17). In addition, the cross-sectional shape of the invert joint (A) and its opening diameter (D) are determined by
It is dimensioned to match exactly that of (17) or slightly larger than the inflow conduit (16) on the inlet side and slightly smaller than the outflow conduit (17) on the outlet side, and its invert joint (A ) And both pipes (16) and (17) are prevented from accumulating the fixed dirt and the like.

Moreover, the upper edge (19) of the gutter-shaped invert joint (A) is provided with an outwardly sloping slope that intersects the horizontal plane (XX) by a constant angle (α), which will be described later. The sand particles of the finishing layer do not adhere to or accumulate on the upper edge (19) of the invert joint (A), and fall surely to the outside, and the ridge line ( (Y-Y) is a plaster ruler so that the finishing layer can be painted easily and beautifully, and the upper end edge (19) of the invert joint (A) is not unsightly exposed from above.

In the basic embodiment shown in FIGS. 1 to 5, the invert joint (A) has a planar shape, and the manhole (M) is provided so as to connect the inflow pipe (16) and the outflow pipe (17) of the manhole (M). FIG. 6 shows a straight flow passage form that crosses along the opening diameter line of FIG. 6, but a short straight flow passage form along the opening radius line of the manhole (M) as shown in FIG. 6 and FIGS. A curved flow path form curved like an arc, and further, two kinds of the curved line and the straight line meet at a three-way intersection or a four-way intersection.
It is also possible to form various flow path configurations as shown in FIG. 11, and several types of invert joints (A) corresponding to the planar arrangement of the inflow pipe line (16) and the outflow pipe line (17) are available. It is designed and prepared in advance, and this is selectively used at the work site.

In particular, when the invert joint (A) is shaped as a curved flow path configuration as shown in FIGS. 7 to 11, the manhole (M) goes from the inflow pipe line (16) to the outflow pipe line (17). The bending angle (β) of the flow path must be set to 90 degrees or more smoothly. That is, the bending angle (β) is dimensioned to a value larger than 90 degrees and smaller than 180 degrees. This is because if the temperature is less than 90 degrees, the solid waste contained in the sewage is likely to stay, and the inflow conduit (16) does not flow smoothly to the outflow conduit (17).

The invert joint (A) of the present invention, which forms any part of the manhole (M) in any of the above-mentioned various plane shapes, is used as an assembly element such as a body wall (11) or a bottom plate (14) thereof. Since it is not formed integrally with the manhole (M), it is separate and independent from the manhole (M) and is molded into a gutter-shaped block with the minimum necessary flow path shape. Unlike the conventional integrally molded product, it can be easily brought into the existing manhole (M), and even compared to the conventional method of crafting an invert joint at the work site, the manhole ( The installation work of the invert joint (A) can be done quickly and firmly without being affected by the water in M).

<Operation> FIGS. 2 to 5 schematically show the installation state of the invert joint (A) according to the present invention. The installation method on the manhole (M) will be described as follows.

That is, sewage inflow conduit (1
6) and the outflow pipe (17) have already been connected and piped in a relational state in which they open to various planar arrangements, and several types of invert joints (A) having a flow passage form adapted to this are provided. Since it is prepared in advance, it will be shown in Fig. 12 (I).
As shown in the figure, to the bottom of the manhole (M), preferably the mortar mortar base (20) with a mixing ratio of cement and sand of about 1: 2 or 1: 3 and a slump of 0 mm is used as a whole. Then, place the invert joint (A) at the planned installation position, as shown in Fig. (II), and then use the slump-8mm soft mortar to support the invert joint pillow (21).
Are partially built up from above the base (20).

Then, while selectively using the invert joint (A) formed in a flow path form that is compatible with the planar arrangement of the both pipe lines (16) and (17) described above, this is apparent from FIG. 12 (III). As described above, the support pillow (21) that has been piled up is placed from above and both ends of the opening of the invert joint (A) are in a communication state in which they match the inflow conduit (16) and the outflow conduit (17). Position it. In addition, joints (22) (23) as shown in FIGS. 4 and 5 should be provided at the joint between the opening ends of both the pipes (16) (17) and the opening ends of the invert joint (A). Needless to say.

Eventually, when the base (20) and the support pillow (21) are naturally hardened, the invert joint (A) will be kept in a fixed state. Then, as is apparent from FIG. 12 (IV), A slump-0 mm mortar or a concrete entrapment layer (24) is cast from above the base (20) to embrace and fix the periphery of the invert joint (A) and its supporting pillow (21).

The encapsulating layer (24) fills the gap (S) in the manhole (M) partitioned by the invert joint (A), as suggested by the plane states of FIGS. 4 to 11. At that time, only the upper edge (19) of the invert joint (A) is exposed, and the upper surface of the enclosing layer (24) becomes a substantially conical concave curved surface. To set.

And finally, the upper edge (19) of the invert joint (A)
As is clear from FIG. 5 (V), the upper layer of the encapsulating layer (24) has a finishing layer (25) of slump-8 to 10 mm of mortar, and the upper surface of the encapsulating layer (24) has a substantially conical concave surface. It is painted so that

At this time, as described above, the upper edge portion (19) of the invert joint (A) is formed as an outwardly sloping slope surface, so the sand particles of the finishing mortar adhere to the upper edge portion (19). Using the ridgeline (YY) that does not deposit and rises at the upper edge (19) as a plaster ruler, the finishing layer (25) made of the mortar can be painted quickly and beautifully with high precision.

It is also possible to omit the step of FIG. 12 (V) and use the enclosing layer (24) of mortar or ready-mixed concrete of FIG. (IV) as the finishing layer (25) as it is.

In any case, the invert joint (A) is shown in Fig. 12 (III).
In the middle of the process, since it was installed in a stable fixed state first, as an operator, the invert joint (A)
While riding on the top, the work of placing the enclosing layer (24) shown in (IV) of the figure and the painting of the finishing layer (25) shown in (V) of the figure are performed extremely smoothly and efficiently. can do.

Next, FIG. 13 shows a first modified embodiment of the installation method, in which the slump-5 to 8 mm is used as the base (20).
As shown in Fig. 1 (I), the fresh concrete of Fig. 1 was used to pour the whole concrete into the bottom of the manhole (M).

Further, while omitting the build-up step of the support pillow (21) for the invert joint, while utilizing the base (20) of the soft ready-mixed concrete, the invert joint (A) as shown in FIG. It is positioned directly on the upper surface of the base (20) and in a state of being slightly depressed.

Then, as soon as the invert joint (A) is kept in a fixed state by the dry hardening of the base (20), finally the gap (S) between the manhole (M) and the invert joint (A) is finally obtained.
As if it were filled with slump, the upper surface of the base (20) is a conical concave curved surface with a slump of about 5-8 mm and a wrapping layer (24) and finishing layer (25) made of fresh concrete or mortar. The state is set all at once.

According to such an installation method, it takes about 1 to 3 hours to cure the substrate (20), but the enclosing layer (24) and the finishing layer (25) are in a stacked state without a seam. Since it is integrally formed, the invert joint (A) has an advantage that it can be installed more firmly, and the installation time can be shortened.

In that case, in order to prevent the invert joint (A) from being inadvertently lifted up in the middle of the process of FIGS. 13 (II) and (III), the time required for hardening the base (20) is used. It can be said that it is effective to bring the fixing bar (26) as shown into contact with the inside of the invert joint (A) so as to press and fix it from above.

This is because the installation time can be further shortened. The reference numeral (27) in the figure is a holding bar of the fixed bar (26), which is laid across the inflow conduit (16) and the outflow conduit (17) of the manhole (M).

Further, FIG. 15 shows a second modified embodiment of the installation method, in which the invert joint (A) is replaced with the manhole (M).
Instead of being affected by the water inside, it can be installed while actively using the water.

That is, as shown in Fig. 1 (I), underwater cement or cement-based underwater bond that solidifies to the bottom of the manhole (M) after about 5 to 10 minutes by water is used as a base (20), and the dots are scattered. Place in distributed dumplings. The base (20) is distributed to the planned installation positions so that the base (20) becomes the support pillow (21) of the invert joint (A) as a whole. The reason for placing in such a scattered distribution state is that the work is completed quickly in relation to the solidification time.

Next, as shown in Fig. 2 (II), the invert joint (A) is placed on the solidified base (20) from above, and both ends of the opening are connected to the inflow pipe line (16) and the outflow pipe line of the manhole (M). While positioning so as to match with (17), open both ends of the invert joint (A) and both pipes (16) (17)
Joints (22) and (23) are also applied to the joint with the open end of the.

After that, as shown in (III) of the figure, the gap (S) between the invert joint (A) and the manhole (M) and the adjacent mutual gaps (G) of the scattered base (20) are filled. From the upper side of the base (20), a slump-5 to 8 mm mortar or a concrete entrapment layer (24) is placed, but at that time from either the left or right side of the invert joint (A). The water is pushed toward the other side and floated toward the other side, and is transferred to the inside of the invert joint (A) by pouring toward the other side, and in sequence to the outflow pipe line through the invert joint (A). It is driven out of the manhole (M) from (17).

Then, by placing the enclosing layer (24), the periphery of the invert joint (A) is completely held and fixed, and finally, as shown in FIG. The finishing layer (25) of soft mortar or ready-mixed concrete is applied so that the upper surface thereof is also a substantially conical concave curved surface. Even in that case, the enclosing layer (24) and the finishing layer (25) can be used in combination and can be applied at the same time.
This is similar to the basic embodiment shown in FIG. The other constructions of the first and second modified embodiments of the installation method are substantially the same as those shown in FIG.
Only the symbols corresponding to those in FIG. 12 are entered in FIGS. 15 to 15, and the detailed description thereof is omitted.

<Effects of the Invention> As described above, according to the present invention, as an installation method of the invert joint (A) in the sewage manhole (M) on the road, as an overall gutter-shaped concrete block on which an operator can ride, and its planar shape. Is a straight flow passage form for connecting the sewage inflow pipe line (16) and the outflow pipe line (17) of the manhole (M), or a curved flow passage form that bends in a smooth arc shape of 90 degrees or more, Alternatively, the invert joint (A) is formed by forming a flow path in which the straight line and the curved line meet each other, and giving the upper edge (19) of the gutter-shaped concrete block an outwardly declining slope of a certain angle (α). Of the mortar or ready-mixed concrete is placed in the bottom of the manhole (M) to connect the sewage inflow pipe (16) and the outflow pipe (17). Possible invert fitting (A) While-option used, as an anti-state opening both end portions of the inverted joint (A) corresponds matches the inflow conduit (16) and outlet line (17), said base (20)
And the joint (22) (23) at the joint with the manhole (M), and after fixing the invert joint (A) by hardening the base (20), the manhole ( In order to fill the gap (S) in M), ride on the invert joint (A), and from above the base (20), insert the mortar or ready-mixed concrete inclusion layer (24) for the invert joint into the upper surface. Is formed into a substantially conical concave curved surface, and then the ridgeline (Y-Y) rising to the upper edge (19) of the invert joint (A) is used as a plaster ruler and above the enclosing layer (24). Since the finish layer (25) of mortar is applied so that the upper surface of the mortar has a substantially conical concave curved surface and covers the upper edge portion (19) of the invert joint (A), the finish layer (25) is described at the beginning. Reliable problems of conventional technology There is an improvement can effect.

That is, the invert joint (A) has a minimum length necessary for connecting the sewage inflow pipe (16) and the outflow pipe (17) in advance to the manhole (M), and a straight line in a plan view. Since it is a concrete block that is shaped into a curved line, the two types of flow paths that meet each other, this is the manhole (M)
It can be brought into the room without any trouble, and after it has been installed and fixed on the base (20) in a safe state, the operator can ride on the invert joint (A) as a scaffolding and continue striking of the hugging layer (24). It is possible to efficiently paint the installation and the finishing layer (25), and especially the further finishing layer (25) uses the ridgeline (Y-Y) rising on the upper edge (19) of the invert joint (A) as a plaster ruler. You will be able to paint quickly and accurately.
Nevertheless, the installation state of the high-strength invert joint (A) having a high affinity with the manhole (M) can be obtained.

Even if provisional infiltration water, mud, etc. are accumulated in the manhole (M), even if one worker must work in the manhole (M), which is stuffy and has a poor footing,
Since the installation work of the invert joint (A) can be efficiently performed with a little labor, there is no fear of interrupting road traffic forever.

Further, if the configuration of claim 2 is adopted, the sewage inflow conduit (16) and the outflow conduit (17) which are already connected to the manhole (M) are utilized, and both the conduits (16) (17) are used. ), The fixing bar (26) of the presser bar (27) is placed over the base (2
0) Invert joint (A) installed on top of the base (2
Since it is possible to surely prevent the risk of floating before the hardening of 0), there is an effect that the installation work of the invert joint (A) can be performed smoothly and in a shorter time.

Furthermore, if the configuration of claim 3 is adopted, even if infiltration water, muddy water, or the like remains in the manhole (M),
An encapsulating layer (24) that fills the base (20) that is placed in a dumpling-like dispersed state and the adjacent mutual gaps (G).
By this, it is possible to drive the inside of the invert joint (A) to the outside of the manhole (M), and there is an effect that the installation work of the invert joint (A) can be performed without any trouble and with high efficiency.

In any of the above cases, if the structure of claim 4 is adopted, the invert joint (A) can be installed and constructed in an even shorter time by using the inclusion layer (24) and the finishing layer (25) in combination. It can be said that the workability is excellent.

[Brief description of drawings]

FIG. 1 is a perspective view showing a basic embodiment of an invert joint according to the present invention, FIGS. 2 and 3 are sectional views showing two kinds of installation states for the manhole, and FIG. 4 is a line 4-4 in FIG. 5 is an enlarged sectional plan view taken along line 5-5 in FIG. 3, and FIGS. 6 to 11 are sectional plan views corresponding to FIG. 4 showing various modified examples of the invert joint. 12 (I) to (V) are explanatory views showing the installation process of the invert joint, FIGS. 13 (I) to (III) are explanatory views showing a modified embodiment of the installation process, and FIG. 14 is an inversion process. FIG. 15 (I) to (IV) are front sectional views showing the floating prevention state of the joint, and FIGS. 15 (I) to (IV) are explanatory views showing another modified embodiment of the installation process. (16) …… Inflow conduit (17) …… Outflow conduit (19) …… Upper edge (20) …… Base (24) …… Holding layer (25) …… Finishing layer (A) …… Invert joint (M) …… Manhole (G) (S) …… Gap (α) …… Constant angle (β) …… Bending angle

Claims (4)

[Claims] 1. An overall gutter-shaped concrete block on which an operator can ride, and a plane shape of which is a straight line for connecting the sewage inflow conduit (16) and the outflow conduit (17) of the manhole (M). The flow path form, the flow path form of a curved line that bends in a smooth arc shape of 90 degrees or more, or the flow path form in which the straight line and the curve meet, and the upper edge of the gutter-shaped concrete block ( We prepared several kinds of invert joints (A) which are provided with a downward slope of a certain angle (α) in 19), and first, the base of mortar or ready-mixed concrete (20) at the bottom of the manhole (M). Is installed and the invert joint (A) capable of communicating with the sewage inflow pipe (16) and the outflow pipe (17) is selectively used, and both ends of the opening of the invert joint (A) are inflow pipes. Corresponds and matches with line (16) and outflow line (17) It is installed in the base (20) from above, and joints (22) and (23) are provided at the joints with the manhole (M) so that the invert joint (A) is hardened by hardening the base (20). After fixing, ride on the invert joint (A) to fill the space (S) in the manhole (M) partitioned by this, and use it for the mortar or fresh concrete invert joint from above the base (20). The enclosing layer (24) is placed so that the upper surface thereof has a substantially conical concave curved surface, and then the ridge line (Y-Y) rising to the upper edge portion (19) of the above-mentioned invert joint (A) is formed by the plaster ruler. As a coating, a finishing layer (25) of mortar is applied from above the enclosing layer (24) so that the upper surface thereof is also a substantially conical concave curved surface and covers the upper end edge portion (19) of the invert joint (A). Of the road characterized by Installation method for invert joints in sewage manholes. 2. An overall gutter-shaped concrete block on which an operator can ride, and the plane shape of which is a straight line for connecting the sewage inflow conduit (16) and the outflow conduit (17) to the manhole (M). The flow path form, the flow path form of a curved line that bends in a smooth arc shape of 90 degrees or more, or the flow path form in which the straight line and the curve meet, and the upper edge of the gutter-shaped concrete block ( We prepared several kinds of invert joints (A) which are provided with a downward slope of a certain angle (α) in 19), and first, the base of mortar or ready-mixed concrete (20) at the bottom of the manhole (M). Is installed and the invert joint (A) capable of communicating with the sewage inflow pipe (16) and the outflow pipe (17) is selectively used, and both ends of the opening of the invert joint (A) are inflow pipes. Corresponds and matches with line (16) and outflow line (17) As a state of resting, the manhole (20) is installed from above, and joints (22) and (23) are provided at the joints with the manhole (M). M) The invert joint (A) is fixed from above by the fixing bar (26) of the presser bar (27) that is laid across the sewage inflow conduit (16) and the outflow conduit (17). And fixing the invert joint (A) by hardening the base (20), and then riding on the invert joint (A) to fill the gap (S) in the manhole (M) partitioned by this. , The ridgeline (YY) rising on the upper edge (19) of the mortar or fresh concrete from above the base (20) is used as a plaster ruler, and the encapsulating layer (24) and finishing layer (25) for the invert joint. The upper surface of the A method for installing an invert joint in a sewage manhole for roads, characterized in that the upper edge (19) of the joint (A) is coated in a state of being covered and coated. 3. An overall gutter-shaped concrete block on which an operator can ride, and the plane shape of which is a straight line for connecting the sewage inflow conduit (16) and the outflow conduit (17) to the manhole (M). The flow path form, the flow path form of a curved line that bends in a smooth arc shape of 90 degrees or more, or the flow path form in which the straight line and the curve meet, and the upper edge of the gutter-shaped concrete block ( There are several types of invert joints (A) prepared by giving 19) an outer downward slope of a certain angle (α), and first, underwater cement or cement that is solidified by water at the bottom of the manhole (M). The base (20) of the system underwater bond is placed in the scattered state of the dumplings, and the invert joint (A) that can communicate with the sewage inflow conduit (16) and the outflow conduit (17) is selected. While using the invert joint (A) Both ends of the opening are installed in the base (20) from above so that both ends of the inflow conduit (16) and the outflow conduit (17) correspond to each other, and the joint (22) is connected to the manhole (M). (23) is applied, and after fixing the invert joint (A) by hardening the base (20), the space (S) in the manhole (M) partitioned by this and the base (20) with the scattered distribution are next to each other. In order to fill the matching mutual gap (G), ride on the invert joint (A), and from the upper side of the base (20), insert the mortar or ready-concrete inclusion layer (24) for the invert joint into the invert joint (A). By placing in such a state that one of the left and right sides in A) is sequentially laminated toward the other, the water is pushed toward the other side and floated, and is transferred into the inside of the invert joint (A), and the invert joint is (A)
Through the outflow conduit (17) to the outside of the manhole (M), and then using the ridgeline (Y-Y) rising on the upper edge (19) of the invert joint (A) as a plaster ruler, the enclosing layer. A mortar finishing layer (25) is provided from above the (24), the upper surface of which is a substantially conical concave curved surface and the invert joint (A).
A method for installing an invert joint in a sewage manhole for roads, characterized in that the upper edge (19) of the road is coated and coated. 4. A ridge line (Y-Y) which doubles as an envelopment layer (24) for an invert joint and also as a finishing layer (25) of mortar, and which is raised at the upper edge (19) of the invert joint (A).
As a plaster ruler, apply the finishing layer (25) from above the base plate (20) so that its upper surface has a substantially conical concave curved surface and covers the upper edge (19) of the invert joint (A). The method for installing an invert joint in a sewage manhole of a road according to claim 1 or 3,