JP3035268B2 - Installation structure of manhole connecting sub-pipe, its construction method and installation block used for them - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an installation structure of a sub-manhole connecting pipe which is branched from an inflow pipe and is connected to the bottom of the manhole in order to regulate the flow of water into the manhole, and a method of constructing the same. Regarding the installation block used for
In particular, it can be easily constructed on site.

[0002]

2. Description of the Related Art When the difference between the bottom of a manhole and the bottom of a manhole, that is, the head of water flowing into the manhole is 0.6 m or more, for example, as shown in FIG. It is desirable to equip a sub-tube A connected to the bottom, and some are obligatory.

[0003] Thereby, the water flowing into the manhole C is dispersed to prevent erosion of the bottom of the manhole due to falling water, and to prevent a person working in the manhole from being exposed to sudden water flow such as flash flood. Or The sub pipe A is protected from being affected by the surrounding earth pressure due to external force such as road vibration and ground subsidence by casting concrete D or the like around the sub pipe A.

[0004] As a method of protecting the above-mentioned manhole connection sub-tube, the following method has been adopted, which is roughly divided from the prior art. 1) An on-site construction method in which a formwork is formed around the sub-pipe, and ready-mixed concrete is poured into the formwork, cured (cured concrete), and then backfilled with soil. 2) A block installation method for assembling a concrete sub-tube installation block (hereinafter referred to as a sub-tube block or an installation block) in which a sub-tube is embedded in advance in a manhole body.

The method 1) is a general method that has been used for a long time, and the method 2) is an alternative method to the method 1). 6-43241 or Hei 2-109844
As disclosed in Japanese Unexamined Patent Application Publication No. HEI 10-205, various shapes of secondary pipe blocks have been proposed.

[0006]

However, the above-mentioned conventional method has the following problems. First,
In the above-mentioned on-site construction method 1), not only skill is required for forming a mold and pouring of ready-mixed concrete, but also it takes 3 to 4 days for curing (hardening of concrete). It is necessary to lengthen the construction period until release, and there is a problem that the cost increases.

On the other hand, the method 2) has an advantage that the construction period can be shortened as compared with the method 1) since the sub-tube block produced in advance at the factory is merely assembled on site. However, since the sub-pipe block and the manhole are merely assembled using bolts and nuts, mechanical coupling of the bolts and nuts when the manhole is constantly subjected to external forces such as road vibration and ground subsidence As a result, there is a problem that the displacement of the sub-pipe block occurs to cause a crack in the sub-pipe, and furthermore, the sub-pipe and the inflow pipe separate from the manhole to cause water leakage.

Further, Japanese Unexamined Patent Application Publication No. Sho 61-24732, Japanese Utility Model Publication No. 6-43241, and Japanese Utility Model Application Laid-Open No. 2-10984 have been disclosed.
The sub-pipe block disclosed in Japanese Patent Publication No. 4 and the like is assembled in advance on a site divided into a plurality of pieces. However, it takes a lot of skill and time to align and seal the joint. In addition, there is a problem that the block in which the L-shaped portion of the sub-tube is embedded has a special shape, which increases the manufacturing cost.

According to the connecting structure of the sub-pipe shown in FIG. 8, the sub-pipe A branches off from the inflow pipe B and is connected to the bottom of the manhole C, while the inflow pipe B is connected to the manhole C. There is a connection part F at the bottom of the sub pipe A and the manhole C
In addition, the connection portion G between the inflow pipe B and the manhole C is a connection having a so-called rigid structure in which the connection portion G is fixed by being applied and fixed with a mortar, cement, or a synthetic resin adhesive.

For this reason, if the soil is buried directly around the auxiliary pipe A and the inflow pipe B after the connection without protecting the auxiliary pipe, the manhole will lose its own weight, road vibration, ground subsidence, etc. In case of subsidence or inclination due to the earth pressure caused by the external force, there is no part capable of absorbing the displacement of the earth pressure at the connection parts F and G, so that the connection parts are cracked or the sub pipe A and the inflow There is a problem that the pipe B is displaced from the manhole C to break both pipes, or in the worst case, both pipes are detached from the manhole, causing flooding and water leakage from the respective connection portions.

[0011] Each time a problem of inundation or water leakage occurs, the soil at the buried site is dug up and repairs for stopping water, replacement of the auxiliary pipe A and the inflow pipe B are repeated, or in the worst case, There is a problem that it requires a lot of labor and cost in terms of maintenance, such as the necessity of large-scale construction for replacing the entire manhole. Further, regarding the protection of the sub-pipe, the method of 1) is to cast concrete around the sub-pipe A and fixed integrally with the manhole, and the method of 2) is to insert-mold the sub-pipe A in advance. In this case, a concrete sub-tube block is assembled and fixed integrally with the manhole, both of which protect the rigid structure.

For this reason, although the auxiliary pipe A itself is not directly affected by the surrounding earth pressure, the inflow pipe B has a portion that is directly affected by the earth pressure. If the manhole is sunk or tilted due to its own weight or earth pressure due to external force such as road vibration or ground subsidence after burial, the inflow pipe B may have cracks, bends, breaks, etc. There is a problem that a damaged portion is generated and water is leaked or leaked from the damaged portion.

The present invention has been made in view of the above-mentioned problems of the prior art,
By preventing the connection of the secondary pipe to the inflow pipe and manhole to be flexible, or by making the support of the secondary pipe itself flexible, it is possible to prevent the connection of the secondary pipe and damage to the inflow pipe due to earth pressure, etc. With the goal. Another object of the present invention is to make it possible to easily install such an installation structure of a sub pipe on site.

[0014]

In order to achieve the above object,
The present invention has taken the following technical measures. That is, the present invention uses a flexible connecting member for connection between the sub-pipe and the inflow pipe and the manhole and connection between the sub-pipe and the inflow pipe, or the stacking and water permeability of a plurality of blocks described later. An installation structure for a manhole connection sub-tube, wherein the sub-tube is protected by forming a packed layer of solid particles.

More specifically, in the first installation structure according to the present invention, an inflow pipe and a sub-pipe branching downward from the inflow pipe are connected to the side of the manhole, and the sub-pipe is surrounded and protected from the surroundings. In the installation structure of the manhole connection sub-pipe in which a plurality of blocks divided in the vertical direction are installed at the side of the manhole, both connection ends of the sub-pipe are arranged with respect to the inflow pipe and the side of the manhole. And are connected via a flexible connecting member.

In this case, even if the manhole is displaced by the influence of the earth pressure, the displacement is absorbed by the flexible connecting member, so that cracks are generated in the auxiliary pipe or the inflow pipe, or the connecting portions thereof are formed. Damage is effectively prevented. Further, according to the first installation structure, even if a crack occurs in the sub pipe or the inflow pipe or a trouble occurs in which both pipes are separated from the manhole, only the sub pipe, the inflow pipe or the flexible connection member is used. There is also an advantage that the repair work can be simplified simply by replacing the work.

In the first installation structure, in order to more effectively prevent breakage of the inflow pipe, not only the connection end of the sub-pipe but also the connection end of the inflow pipe with respect to the side of the manhole. It is preferable to connect via a flexible connecting member. Further, in the second installation structure according to the present invention, the plurality of blocks are arranged at a distance from the outer peripheral surface of the sub-pipe, and a filling layer made of solid particles having water permeability is formed within the space. It is characterized by having been done.

In this case, even if the manhole is displaced by the influence of earth pressure, the packed layer made of solid particles having water permeability absorbs the displacement caused by the surrounding earth pressure. And their connection parts are effectively prevented from being damaged. The first and second installation structures can be implemented independently, or both can be used in combination.

In the first installation structure, it is preferable that the plurality of blocks be provided with drain holes for allowing the moisture in the packed bed to escape to the outside, or to be formed of a water-permeable foam. . If such a block is used, rainwater or groundwater that has permeated the packed bed through the joint of the block after being buried (after completion of construction) is drained to the outside or the block side, whereby the moisture content of the packed bed is substantially constant Is held. For this reason, the packed bed is always maintained in a compacted state by the drainage function, and the auxiliary pipe is stably protected for a long period of time.

In the case of a block made of a foam having water permeability, the block itself contains water and has a water-retaining function, so that the function of keeping the water content of the packed bed constant is more effectively achieved. . The sub-tube installation block used in the second installation structure is, specifically, a support block that supports the horizontal portion of the sub-tube branched downward from the inflow pipe connected to the side from below, and a sub-block. A plurality of adjustment blocks stacked on the support block so as to surround a vertical portion of the tube, wherein the support block has a fitting groove having an upper surface larger than the outer diameter of the horizontal portion of the sub-tube. The adjustment block has an opening having a width larger than the outer diameter of the vertical portion of the sub pipe and opening to the manhole side.

In this case, the fitting groove of the support block and the opening of the adjustment block function as a space for forming a filling layer made of solid particles, so that they do not require precise processing accuracy. The shape of each block is simplified. For this reason, a factory can be produced at low cost without requiring a special mold. Further, the present invention also provides a construction method of the second installation structure, and this construction method includes the following steps.

A first step of connecting the two connecting ends of the sub-pipe to the side of the inflow pipe and the side of the manhole, respectively, so as to surround the sub-pipe at a distance from the horizontal and vertical parts of the sub-pipe; A second step of sequentially stacking a plurality of blocks from below, a third step of filling a space formed inside each of the stacked blocks with solid particles having water permeability to form a packed layer of the solid particles, A fourth step of backfilling the soil around each of the blocks and the inflow pipe.

According to the construction method described above, the blocks are assembled on site by simply stacking the blocks together, and there is no need to fix the blocks to the manhole. After the assembly, the filling layer is filled in the space formed inside each block. Since it is only necessary to backfill after forming, the work time and work cost required for installing the sub-pipe can be greatly reduced.

Further, the protection structure of the sub-tube obtained by this construction method is such that the blocks are stacked so as to surround the sub-tube without being fixed to the manhole, and the space around the sub-tube formed by stacking in this manner. Since a flexible layer is formed in which a packed layer of solid particles having water permeability is formed, the packed layer effectively absorbs displacement due to surrounding earth pressure and effectively prevents breakage of the sub-pipe and its connection.

In the above construction method, when the first installation structure is adopted, the connection of the sub-pipe in the first step and the connection of the inflow pipe to the manhole are performed by a flexible connection member. What should I do? In addition, if the above-described support block and adjustment block are used as the plurality of blocks in the third step, their structures can be obtained simply and inexpensively, so that the material cost in construction can be reduced.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications can be made without departing from the spirit of the present invention. 1 to 4 show an embodiment of a method for protecting a sub pipe according to the present invention.

FIG. 1 is a perspective view of a manhole and its inflow pipe and sub pipe, FIG. 2 is a sectional view taken along line XX of FIG.
2 is a sectional view taken along the line ZZ in FIG. 2, and FIG. 4 is a side view as seen from the Y direction in FIG. 1 to 4, 1 is a sub pipe, 2 is an inflow pipe, 3 is a manhole, 4 to 6 are flexible connection members (hereinafter, referred to as flexible joints), 7 is a bottom plate block, and 8 is a bottom plate block.
Denotes a support block for supporting the sub pipe 1 from below (hereinafter referred to as a sub pipe receiving block), 9 denotes an adjustment block, and 10 denotes a packed layer of solid particles.

As shown in FIG. 2, the sub pipe 1 has a vertical straight pipe section 11, a horizontal straight pipe section 12, and an elbow section 1 connecting them.
2A, which are integrated in a factory in advance or integrated by on-site assembly. The connecting end 13 of the vertical portion 11 is connected to the opening 21 formed in the middle of the inflow pipe 2 by the flexible joint 4, and the connecting end 14 of the horizontal portion 12 is connected to the manhole 3 by the flexible joint 5.
Is connected to the opening 31 provided at the lower part of the side surface of the.

By such a connection, even if the auxiliary pipe 1 receives a displacement of the surrounding earth pressure, this displacement is absorbed by the flexible joints 4 and 5 (in other words, a flexible structure type connection is obtained). )), Which is a problem of the conventional rigid structure type connection.
Damage and separation from the manhole 3 can be eliminated. It is desirable to use the flexible joint 6 for connecting the inflow pipe 2 and the manhole 3 in addition to the connection of the sub pipe 1. That is, as shown in FIG. 2, the connection end 22 of the inflow pipe 2 is connected to the opening 32 provided at the center of the side surface of the manhole 3 by the flexible joint 6. By such a flexible structure type connection, it is possible to solve the problems of the conventional rigid structure type connection such as damage to the inflow pipe 2 and separation from the manhole 3 as in the case of the sub pipe 1.

The auxiliary pipe 1 and the inflow pipe 2 used in the present invention are usually hard vinyl chloride pipes (hereinafter, referred to as PVC pipes), but concrete pipes, steel pipes, and ceramic pipes. Alternatively, it may be any resin tube other than vinyl chloride resin, and is not particularly limited. The flexible joints 4 to 6 used in the present invention may be appropriately selected from commercially available products that have flexibility such as rubber and are processed into a shape suitable for the connection structure. The material and structure are not particularly limited.

Next, following the above connecting step, FIGS.
As shown in FIG. 4, a bottom plate block 7, a sub pipe receiving block 8, and a plurality of adjustment blocks 9 are sequentially stacked from the bottom in this order so as to surround the connection sub pipe 1. In this stacking step, it is not always necessary to fix and integrate the blocks 7 to 9 or the blocks 7 to 9 and the manhole 3 as in the prior art.
It is desirable to make the stack freely slidable so that .about.9 can absorb the displacement of the earth pressure.

This is because the original function of each of the blocks 7 to 9 is to protect the sub pipe 1 so that the sub pipe 1 is not directly affected by the surrounding earth pressure. This is because there is no need to fix and integrate as long as. However, due to the structure of the ground at the buried site, for example, when the ground at the buried site is soft or the ground subsidence or sinking due to the outflow of earth and sand due to groundwater is significant, it is necessary to prevent the displacement of the blocks 7 to 9. It is more desirable to fix and integrate according to.

Conversely, even if there is little displacement of the earth pressure, if the displacement is within a range that the flexible joints 4 to 6 can absorb, the stacking process of the blocks 7 to 9 is omitted. The protection structure of the sub-pipe can be appropriately selected according to the structure of the ground at the buried location. Here, the blocks 7 to 9 of the present invention are shown in FIG.
This will be described based on FIGS.

FIG. 5 is a perspective view of the bottom plate block 7, FIG. 6 is a perspective view of the auxiliary pipe receiving block 8, and FIG. First, a bottom plate block 7 shown in FIG.
1 is formed. The concave depression 71 has a function of draining and retaining water of the packed layer 10 of solid particles described later. Then, at the time of stacking, as shown in FIG. 2, one or two or more are placed according to the height of the lowermost end of the lower opening portion 31 from the bottom surface 34 of the manhole 3.

In the case where the manhole base (not shown, this is a layer of rubbed stones) is previously leveled to an appropriate position at the height, the placement of the bottom plate block 7 is omitted. Is also good. Next, the auxiliary pipe receiving block 8 shown in FIG.
1 and a semicircular fitting groove 82 slightly larger than the outer diameter of the horizontal portion 11 of the sub pipe 1 and a semicircular large-diameter groove 83 slightly larger than the outer diameter of the flexible joint 5 are formed in the center. And a convex band 8 for fitting along the longitudinal direction.
4 (see FIG. 6A) or concave grooves 85 (see FIG. 6B) are formed on both left and right sides of the upper surface.

The concave depression 81 is provided with a solid particle filling layer 1 described later.
It has a zero drainage / water retention function. Then, at the time of stacking, as shown in FIG.
Or on a manhole base (not shown). As described later, the semicircular fitting groove 82 and the large-diameter groove 83 are filled with sand or gravel, thereby supporting the horizontal portion 12 and the elbow portion 12A of the sub pipe 1 from below.
Excessive displacement of the flexible joint 5 is reduced.

Incidentally, the convex band 84 and the concave groove 85 are formed as shown in FIG.
Are provided at the left and right ends, but may be provided, for example, at the center of both sides, and can be changed to various positions without departing from the spirit of the present invention. The bottom plate block 7 and the auxiliary pipe receiving block 8 have the concave recesses 7.
In addition to 1, 81, a small hole (drain hole) for discharging the moisture of the filling layer 10 to the outside may be formed.

Further, the adjusting block 9 shown in FIG. 7 has a substantially U-shaped opening 91 which opens toward the side that comes into contact with the side wall of the manhole, and this opening 91 has an outer diameter of the vertical portion 11 of the sub pipe 1. It is formed wider than that. A convex band 92 for fitting and a concave groove 93 are formed along the longitudinal direction on both the upper and lower sides of the adjustment block 9.

At the time of stacking, as shown in FIG. 2, the elbow portion 12A of the sub pipe 1 and the vertical straight pipe section 11 are surrounded so that the number corresponding to the mounting height of the sub pipe 1 is increased. The adjustment block 9 is placed on the auxiliary pipe receiving block 8. In this case, the lowermost adjustment block 9 is configured such that the concave groove 93 on the lower surface thereof (or the convex band 92 when it is turned upside down) is fitted into the convex band 84 (or concave groove 85) of the auxiliary pipe receiving block 8. It is stacked on the pipe receiving block 8.

On the other hand, when the adjustment blocks 9 and 9 are stacked, the concave groove 93 on the lower surface of the upper adjustment block (or the convex band 92 when it is turned upside down) is replaced with the convex band 92 on the upper surface of the lower adjustment block. (Or concave groove 93 when turned upside down)
It is carried out so as to be fitted in. Due to such fitting and stacking, each adjustment block 9 does not shift in the left-right direction.

Further, the displacement of each adjustment block 9 in the longitudinal direction hardly occurs because each adjustment block is pressed against the side wall of the manhole by the earth pressure due to the backfilling of the soil described later. In addition, the convex band 92 and the concave groove 93
Are provided at both left and right end positions in FIG. 7, but may be provided at, for example, a center position on both sides, and can be changed to various positions without departing from the gist of the present invention.

As described above, each of the blocks 7 to 9 of the present invention shown in FIGS. 5 to 7 has a simple structure, so that it can be manufactured at a low cost in a factory and can be simply stacked without being fixed to the manhole 3. Only requires a small amount of work, which can be completed in a short period of time without the need for skill like the work of positioning and sealing seams in the sub-tube block assembly of the prior art. It has the advantage that it can be reduced to

The material of each of the blocks 7 to 9 in FIGS. 5 to 7 used in the present invention is not particularly limited, such as concrete, rubber or synthetic resin, waste plastic, and the like. In view of this, concrete is preferable, and as described later, it is more preferable to have a water permeable or drain hole for drainage when compacting sand or gravel.

That is, the bottom plate block 7, the auxiliary pipe receiving block 8 and the adjusting block 9 are porous concrete molded products having water permeability, or the blocks are ordinary concrete molded products having no water permeability and the bottom plate blocks are formed. It is preferable that a plurality of drain holes (not shown) are provided in 7 and the sub pipe receiving block 8. More preferably, it is desirable that the concrete molded product is precast by arranging reinforcing bars or the like so as to have a certain strength.

As shown in FIGS. 2 to 4, the space 1 surrounded by the auxiliary pipe receiving block 8, the plurality of adjusting blocks 9, and the manhole side walls 33 by the above-described stacking step is shown in FIGS.
01 is formed. After the space 101 is filled with solid particles 102 having water permeability such as sand or gravel, water is sprayed on the solid particles 102 (not shown) and the water is supplied to each block 7, 8, 9 itself or a sub-tube. From the concave dent 81 of the receiving block 8 and the concave dent 71 of the bottom plate block 7 are naturally drained and compacted to form the packed layer 10 of the solid particles 102.

Such compacted solid particles 102
Since the filling layer 10 absorbs the displacement of the surrounding earth pressure due to the formation of the filling layer 10, the auxiliary pipe 1 and the flexible joint 5 are directly affected by the surrounding earth pressure. In addition, excessive displacement of the flexible joint 5 can be prevented. Further, as described above, after burying, the manhole 3 sinks or tilts due to its own weight or earth pressure due to an external force such as road vibration and ground subsidence, and the sub pipe 1 is displaced from the manhole 3 (displacement such as center runout). In addition, since the displacement is absorbed by the flexible joint 5, no crack is generated in the sub pipe 1 or the sub pipe 1 does not separate from the manhole 3.

That is, since the compacted filling layer 10 protects the auxiliary pipe 1 in a flexible structure type, it is possible to solve the problems in the conventional rigid structure type protection. Furthermore, since the water content of the packed bed 10 is kept constant by the water retention / drainage function of each of the blocks 7, 8, and 9, the compacted state is always maintained in a compacted state. Over a long period of time.

The compacted packed layer 10 can be formed without spraying water depending on the water content of the solid particles 102, or the compacting step can be omitted depending on the material of the solid particles 102. . The solid particles 1
After compacting the filler layer 02 to form the filling layer 10, the soil is finally buried around the manhole 3, the blocks 7, 8, 9 and the inflow pipe 3. As a result, the auxiliary pipe 1 is reliably protected almost without being affected by the earth pressure.

The backfilling of the soil may be performed immediately after the stacking of the blocks 7 to 9, and may be more preferable in some cases. That is, the backfilling of the soil
9 can be prevented from separating from the side wall 33 of the manhole 3 when filling with sand or gravel, and as a scaffold when forming and compacting the filling layer 10. This is because there is an advantage that on-site work can be performed more easily because it can be utilized.

According to this embodiment described above, the following effects 1) to 5) can be obtained. 1) By using a flexible joint for any of the connection between the sub-pipe and the manhole, the connection between the sub-pipe and the inflow pipe, and the connection between the inflow pipe and the manhole, the connection between the sub-pipe and the inflow pipe and the manhole; Since the connection between the sub-pipe and the inflow pipe has a so-called flexible connection, the manhole will sink or tilt due to its own weight or earth pressure due to external forces such as road vibration and ground subsidence after burial, and the sub-pipe and the inflow pipe will be manhole. Even if it is displaced from the position (displacement such as center runout), the displacement is absorbed by the flexible joint, so that cracks do not occur in the auxiliary pipe and the inflow pipe, and both pipes do not separate from the manhole.

2) Regarding the protection of the sub-pipe, the bottom plate block, the sub-pipe receiving block, and the adjustment block are stacked so as to surround the sub-pipe without being fixed to the manhole, and water is introduced into the space around the sub-pipe formed by stacking. To form a packed layer of solid particles by filling the solid particles, and furthermore, to protect the soft structure by compacting the packed layer by draining while spraying water. Since the displacement is absorbed, the problem of the related art can be completely solved in combination with the effect of the connection of the flexible structure using the flexible joint.

3) Since the bottom plate block, the auxiliary pipe receiving block and the adjusting block are all simple in shape, they can be manufactured at a low cost without the need for a special formwork. Alternatively, since it is only necessary to fit in the concave groove and stack, and it is not necessary to fix it integrally with the manhole, the working time and the working cost can be greatly reduced.

4) Since each of the blocks has a water-permeable or drainage hole, a water-retaining / draining function for maintaining a constant water content in the packed layer of the water-permeable solid particles works. Even if rainwater or groundwater permeates into the packed bed through these blocks, the packed bed will always be kept in a compacted state, and the secondary pipe will be protected stably for a long time. .

5) Since the connection structure and the protection structure of the sub-pipe according to the present invention are flexible, the sub-pipe or the inflow pipe is damaged after being buried, or both pipes are detached from the manhole, and water leakage is caused. In such a case, it is only necessary to replace the damaged secondary pipe, the inflow pipe or the flexible joint, so that the maintenance work can be easier and the cost can be reduced as compared with the related art.

[0055]

As described in the foregoing, according to the installation structure of the sub-tubes of the present invention, the support itself of the sub-tubes by forming a filling layer made of solid particles flexible structure between the sub-tube and the blocks Therefore, it is possible to effectively prevent damage to the connecting portion of the auxiliary pipe and the inflow pipe due to earth pressure. In addition, support for the secondary pipe
In addition to the flexible structure of
When the connection of the sub-pipe and the inflow pipe is made flexible, it is possible to more effectively prevent the connection part of the sub-pipe and the inflow pipe from being damaged due to earth pressure.

Further, according to the method for constructing a sub pipe according to the present invention,
After connecting the inflow pipe and the sub-pipe to the manhole and stacking each block together, it is only necessary to form and fill back the filling layer in the space formed inside each block, so the installation work of the sub-pipe at the site Can be greatly simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view of a protection structure for a sub pipe showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view taken along line ZZ of FIG. 2;

FIG. 4 is a side view as viewed from a Y direction in FIG. 2;

FIG. 5 is a perspective view of a bottom plate block.

FIG. 6 is a perspective view of a sub pipe receiving block.

FIG. 7 is a perspective view of an adjustment block.

FIG. 8 is a sectional view of a protection structure for a sub-tube in the related art.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sub pipe 2 inflow pipe 3 manhole 4 flexible joint (connecting member) 5 flexible joint (connecting member) 6 flexible joint (connecting member) 7 bottom plate block 8 sub pipe receiving block (support block) 9 adjustment block DESCRIPTION OF SYMBOLS 10 Packed layer of solid particles 11 Vertical part of sub-pipe 12 Horizontal part of sub-pipe 13 Connection end of sub-pipe 14 Connection end of sub-pipe 21 Opening of inflow pipe 22 Connection end of inflow pipe 31 Manhole opening 32 Opening of manhole 33 Sidewall of manhole 71 Concave dent 81 Concave dent 82 Semicircular fitting groove 83 Semicircular large diameter groove 85 Concave groove 91 Adjustment block opening 92 Convex band 93 Concave groove 94 Convex band 101 Space 102 solid particles

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-20963 (JP, A) JP-A-6-129000 (JP, A) JP-A-61-24732 (JP, A) 109844 (JP, U) Japanese Utility Model Application Hei 3-29543 (JP, U) Japanese Utility Model Application Hei 6-35344 (JP, U) Japanese Utility Model Application Hei 6-49535 (JP, U) (58) Fields surveyed (Int. ⁷ , DB name) E02D 29/12-29/14 E03F 5/02

Claims (11)

(57) [Claims] An inflow pipe (2) and a sub pipe (1) branching downward from the inflow pipe (2) are connected to the side of a manhole (3), and surround the sub pipe (1) from the periphery. A plurality of blocks (7, 8, 9) divided vertically to protect
Wherein the plurality of blocks (8, 9) are spaced apart from the outer peripheral surface of the sub-tube (1). And a packed bed (10) composed of solid particles (102) having water permeability within this interval.
A structure for installing a sub-manhole connection pipe, characterized in that a hole is formed. 2. Both connecting ends (13, 14) of the secondary pipe (1).
Or inlet pipe (2) connecting end portions of (22) or installation structure manhole connection sub tube according to claim 1, connecting members (4, 5, 6) is used having flexible in both of them . 3. A plurality of blocks (7, 8, 9) of installation structure of the manhole connection sub tube according to claim 1 or 2 is provided with a drain hole for releasing moisture of the filling layer (10) to the outside. 4. The installation structure of the manhole connection sub tube according plurality of blocks (7, 8, 9) of any of claims 1 to 3 consisting of foam having a water permeability. 5. A support block (8) for supporting a horizontal portion (12) of a sub-tube (1) branched downward from an inflow tube (2) connected to a side portion of a manhole (3) from below. And a plurality of adjusting blocks (9) stacked on the support block (8) so as to surround the vertical portion (11) of the sub-tube (1). 8) is provided with a fitting groove (82) on the upper surface that is larger than the outer diameter of the horizontal portion (12) of the sub pipe (1), and the adjusting block (9) is provided with a vertical section of the sub pipe (1). The width is larger than the outer diameter of (11) and the manhole (3)
An opening (91) that opens to the side, and the adjustment block
(9) is not fixed to the manhole (3), and the support
An installation block for a manhole connecting sub-pipe, comprising upper and lower surfaces capable of being sequentially stacked on a lock (8) . 6. The support block (8) and the adjusting block (9) are drain holes for allowing the moisture of the filling layer (10) formed in the fitting groove (82) and the opening (91) to escape to the outside. The installation block for a manhole connection auxiliary pipe according to claim 5 , comprising: 7. A support block (8) and the adjustment block (9) is 5 or claim consisting foam having a water permeability 6
Installation block of the sub-manhole connection pipe described in 4. 8. A first step of connecting the two connection ends (13, 14) of the sub pipe (1) to the side of the inflow pipe (2) and the side of the manhole (3) respectively; Horizontal part (12) and vertical part (11)
A second step of sequentially stacking a plurality of blocks (7, 8, 9) from below so as to surround the sub-tube (1) with a space between the blocks (7, 8, and 9); A third step of filling a space (101) formed inside 9) with solid particles (102) having water permeability to form a packed layer (10) of the solid particles (102); 7, 8, 9) and a fourth step of backfilling the soil around the inflow pipe (2). 9. manhole connection construction method of the sub-tube according to claim 8 connected sub pipe (1) in the first step is performed via a connecting member (4, 5) having flexibility. 10. The sub-manhole connection according to claim 9 , wherein the first step comprises the step of connecting the inflow pipe (2) to the side of the manhole (3) via a flexible connecting member (6). Pipe construction method. 11. Third support block (8) according to any one of the plurality of blocks in step (7, 8, 9) of claim 5 to 7 and claim 8 comprising an adjusting block (9) The method for constructing a sub-tube for connecting a manhole according to any one of claims 10 to 13.