JP3198669U - Manhole renewal structure and new manhole structure - Google Patents

Abstract

The present invention provides a manhole renewal structure capable of extending the life of a manhole by increasing the strength of the manhole without causing further deterioration without applying a large load to an existing straight wall, without causing water leakage. SOLUTION: The road pavement layer and members outside the existing straight wall 1 in the ground of the manhole and the existing steps inside the existing direct wall 1 are removed, and the reinforced composite material is made inside the existing straight wall 1 after being removed. The cylinder 3 with the step 3 a attached inside is fitted, and the cemented backing material 11 is poured and joined between the cylinder 3 and the existing straight wall 1, and is also attached to the ground outside the existing straight wall 1. A support foundation 10 laid with gravel is provided, and a lower protrusion 2a on the outer periphery of the inclined wall block 2 is placed on the support foundation 10 to load an upper load / vibration on the support foundation 10, and the existing straight wall 1 A water-expandable rubber 12 is interposed between the upper end of the slant wall block 2 and the bottom surface of the slant wall block 2, and the lid support ring 4, manhole cover 5, roadbed material, pavement layer, and soil are re-applied to the upper outer periphery of the slant wall block 2. To construct. [Selection] Figure 1

Description

  The present invention is a manhole that has been used for many years due to repeated vertical load, vibration load, earthquake, earth pressure, water pressure, etc. of automobiles etc. It is related with the renewal structure of the manhole which can restore the function by restoring the deterioration state of the existing concrete straight wall as it is and recover the function. In addition, it is an improved manhole structure technology that can be applied as a new manhole.

The manhole structure provided in a culvert such as a sewer is a structure in which a manhole cover support ring and a manhole cover are provided on a cylindrical concrete straight wall.
If this manhole has been used for many years, cracks have occurred in its straight wall due to repeated vertical loads from automobile tires, large vibration loads associated with vehicle running, earthquakes, earth pressure, water pressure, water freezing, etc. As a result, the strength is greatly reduced and water leakage occurs, which shortens the life of the manhole.
If there is a water leak in the manhole, rainwater, groundwater, etc. will flow into the manhole, increasing the amount of water in the sewer and increasing the treatment burden. Therefore, it is required to reduce the water leak in the manhole.

  In response to the deterioration of the manhole, removing the existing concrete structure of the manhole and reconstructing a new manhole required a lot of work days and costs.

Also, in References 1 and 2, as a manhole renewal method, the steps inside the straight wall of the manhole already installed in the manhole are removed, and a cylinder made of composite reinforced resin is fitted inside the straight wall. Renewal work that prevents leakage of the wall and reinforces the strength of the straight wall is disclosed.
However, in this renewal work, the weight of the upper manhole cover, slant wall block, cover support ring, etc., and the external load and vibration from the vehicle, etc., are loaded on this straight wall and the cylinder, and the wall of the cylinder Since the thickness is thin, the external load still acts on the old straight wall, and most of the load is applied to the existing straight wall, making it difficult to extend the life of the manhole.

JP 2004-324060 A JP 2005-105713 A

  The present invention eliminates the problems of these conventional renewal methods, prevents further deterioration without applying a large load to the existing straight wall, increases the manhole's strength without water leakage, It is to provide a manhole renewal structure that can be extended to the lifetime. Another object of the present invention is to provide a manhole structure that can greatly improve the strength and durability of a newly installed manhole structure by using the same structure.

The configuration of the present invention that solves this problem is
1) A resin foundation with a step attached to the inner surface of the existing straight wall in the ground where the step was removed was fitted, and a support foundation with gravel laid on the outer peripheral ground at a position lower than the upper end of the existing straight wall. A manhole cover, a lid support ring, and a slanted wall block are arranged in order from the top on the existing straight wall, and a lower protrusion provided on the lower outer periphery of the slanted wall block is grounded to the upper surface of the support base to A vertical load from the lid support ring and the inclined wall block is supported by the support foundation, and a water-expandable rubber is interposed between the lower surface of the lower portion of the inclined wall block, the upper end of the existing straight wall, and the upper end of the cylindrical body. 2) Manhole renewal structure kept in a watertight state 2) A plastic cylinder with a step attached to the inner surface of the existing straight wall inside the ground where the step has been removed protrudes higher than the upper end of the existing straight wall. The cylindrical body is fitted to Provide a support foundation with gravel on the outer peripheral ground lower than the upper end, and place a manhole cover, lid support ring and bottom base block in order from the top on the existing straight wall, and a lower protrusion provided on the outer periphery of the bottom base block Is grounded to the upper surface of the support base to support the vertical load from the manhole cover / lid support ring and the bottom base block with the support base, and a water-expandable rubber is interposed between the upper end of the cylinder and the bottom surface of the bottom base block. In addition, a manhole renewal structure that maintains the water tightness by filling the space surrounded by the upper end surface of the cylindrical outer wall and the existing straight wall, the support foundation, the bottom surface of the bottom base block, and the inner wall surface of the lower projection with soil. The above-mentioned 1) or 2), in which a cement-based backing material is press-fitted into the gap between the inner wall of the existing straight wall and the outer wall of the fitted cylinder, and the two are joined without gap to enhance the strength and water tightness. Updated manhole structure described ) A supporting foundation in which a plastic cylinder with a step attached to the inner surface is fitted inside a straight wall in the newly installed underground without a step, and gravel is laid on the outer peripheral ground at a position lower than the upper end of the straight wall. A manhole cover, a lid support ring, and a slanted wall block are arranged in order from the top on the straight wall, and a lower protrusion provided on the lower outer periphery of the slanted wall block is grounded to the upper surface of the support base so as to cover the manhole cover.・ The vertical load from the lid support ring and the slant wall block is supported by the support foundation, and a water-expandable rubber is provided in the gap between the lower surface of the bottom of the slant wall block, the upper end of the straight wall and the upper end of the cylindrical body. 5) Manhole structure held in a watertight state 5) A resin cylinder with a step attached to the inner surface of a straight wall inside a new ground without a step attached to the upper end of the cylinder from the upper end of the straight wall Fit to protrude high A support foundation in which gravel is laid on the outer peripheral ground at a position lower than the upper end of the cylindrical body is provided, and a manhole cover, a lid support ring and a bottom base block are arranged in order from the top on the existing straight wall, and provided on the outer periphery of the bottom base block. The lower protrusion is grounded to the upper surface of the support base to support the vertical load from the manhole cover / lid support ring and the bottom base block by the support base, and the water-expandable rubber is provided between the upper end of the cylinder and the bottom base block lower surface. In addition, the space between the outer wall of the cylindrical body, the upper end surface of the existing straight wall, the support foundation, the bottom surface of the bottom base block, and the inner wall of the lower protrusion is filled with soil to maintain watertightness. Structure 6) The above-mentioned 3) or 3), wherein a cement-based backing material is press-fitted into the gap between the inner wall of the straight wall and the outer wall of the fitted cylinder, and the two are joined without gaps to increase strength and water tightness. 4) In the manhole structure described .

In the present invention, the load / vibration from the top of the manhole cover / lid support ring / slanted wall block hardly acts on the existing straight wall or the new straight wall and the upper end of the resin cylinder inside it. A direct load is applied to the ground via a gravel foundation provided on the lower outer peripheral portion of the slant wall block, and a large load is not applied to the existing straight wall or the new straight wall and the cylinder.
This stops or delays further deterioration of the straight wall.
In addition, water leakage can be prevented by interposing a water-expandable rubber between the straight wall and the inner cylinder and the lower wall surface of the slant wall block. It is blocked by the inner cylinder.
Therefore, according to the present invention, water leakage is eliminated, and the progress of the deterioration of the existing straight wall is stopped or delayed so that the life of the manhole can be extended.

  Furthermore, if a cement-type backing material is press-fitted into the gap between the inner wall of the straight wall and the outer wall of the fitted cylinder, and the two are joined without a gap, the strength and water tightness can be further improved. .

FIG. 1 is an explanatory view showing the structure of the present invention. FIG. 2 is a longitudinal sectional view showing a manhole renewal structure according to the first embodiment. FIG. 3 is a plan view of the oblique wall block of the first embodiment. FIG. 4 is a longitudinal sectional view showing the structure of the second embodiment. FIG. 5 is a plan view of the bottom block of the second embodiment.

  As a material of the cylindrical body of the present invention, it is preferable to use a reinforced plastic composite pipe RCP having a thickness of about 16 mm in which an FRP layer made of glass fiber and an unsaturated polyester resin and a resin mortar layer are laminated.

As the water-swellable material used in the present invention, it is preferable to use a water-swellable rubber because it has elasticity and durability.
In addition, the slant wall block, lid support ring, and new straight wall used in the present invention are installed by transporting concrete blocks manufactured in good quality at the factory to the manhole site.

Even if a new manhole is constructed, the present invention can be the same structure as the renewal structure, and can be used as a new manhole structure. As a new manhole structure, the load / vibration on the straight wall is greatly reduced. The rate of deterioration of the substrate can be slowed down, and the manhole life can be extended.
As a work procedure in this case, a straight wall without a new step is first constructed on the culvert of the sewer, and a cylinder with a step is fitted inside, and if necessary, between the straight wall and the cylinder. Cement backing material is poured and joined, and then the ground is backfilled with soil and backing material on the outer periphery of the straight wall, and a support foundation such as gravel is applied to a part of the ground constructed on the outer periphery of the straight wall. If the lower projecting part provided on the lower outer periphery of the upper slant wall block or the bottom block is placed on this, and the water-expandable rubber is interposed, it will be the same as the renewed structure of the existing manhole. It has a structure with an effect that can extend the life.

  Hereinafter, Example 1 used for a manhole with a thick earth covering and Example 2 used for a manhole with a shallow earth covering will be described with reference to the drawings.

Example 1
1 to 3 is an example of an updated structure of a manhole with a earth covering of 1.8 m. The existing straight wall was 200 mm thick, and a 16 mm RCP pipe was used as the cylinder.
In the figure, G1 is the renewal structure of the manhole of the first embodiment, 1 is an existing straight wall made of concrete having a thickness of 200 mm, 2 is a concrete slant wall block for renewal, 2a is a lower outer periphery of the slant wall block 2 Provided lower protrusions, 2b is the upper opening of the slant wall block 2, and 3 is a reinforced structure composed of inner and outer FRP layers made of glass fiber and unsaturated polyester resin, and a resin mortar layer made of unsaturated polyester resin and sand. A 16 mm-thick cylindrical body using ESLON RCP (registered trademark), which is a plastic composite pipe, 3a is a step mounted inside the cylindrical body 3, and 4 is installed on the opening edge of the upper opening 2b of the inclined wall block 2. 5 is a manhole cover, 6 is a sewer in the sewer, 7 is a circular track board that forms the surface layer around the manhole cover 5, 8 is the ground, 9 is a paved roadbed, and 10 is an existing straight wall The gravel ring hole of the ground of the outer periphery of a supporting basis for the annular filled in 150mm thickness. Reference numeral 11 denotes a cement-based backing material poured between the outer surface of the cylindrical body 3 and the inner wall of the existing straight wall 1, and 12 denotes the lower surface of the inclined wall block 2, the upper end of the existing straight wall 1, and the upper end of the cylindrical body 3. It is a water-expandable rubber using Hydrotite (registered trademark) interposed in the gap.

The construction work procedure of the update structure of Example 1 is shown.
a: First, the outer peripheral ground of the existing manhole and the paved roadbed 9 of the road are excavated, the existing lid support ring and the existing inclined wall block are removed, and the upper outer periphery of the existing straight wall 1 is also excavated.
b: Remove the step, inner sub-pipe, etc. inside the existing straight wall 1, clean the inner wall, remove the fragile portion, and perform rust prevention treatment of the reinforcing bars.
c: The position of the inflow / outflow pipe of the cylindrical body 3 is determined, and the cylindrical body 3 is processed and shaped on-site so that the pipe can be connected.
d: A step 3 a is attached to the inside of the cylinder 3 and fitted into the existing straight wall 1.
e: Sealing with a clay mortar so that the backing material does not leak into the bottom of the existing straight wall 1 and the opening of the cylinder 3.
f: When the seal portion is cured, a cement-based backing material is poured between the existing straight wall 1 and the cylindrical body 3, and the gap between the existing straight wall 1 and the cylindrical body 3 and cracks in the existing straight wall are Injecting material 11 is injected and cured to join them, fix step 3a, and repair water leakage.
g: An annular hole having a depth of 150 mm is excavated in the ground 8 on the upper outer periphery of the existing straight wall 1, and this is filled with gravel to provide an annular support foundation 10.
h: The water-expandable rubber 12 is temporarily fixed to the upper end 1a of the existing straight wall 1 and the upper end of the cylindrical body 3, and the new slant wall block 2 shown in FIGS. Place from above. At that time, it is installed so that the lower protrusion 2 a on the lower outer periphery of the inclined wall block 2 loads on the support foundation 10. At this time, the water-expandable rubber 12 is lightly compressed between the lower surface of the inclined wall block 2 and the upper end of the existing straight wall 1 and the upper end of the cylindrical body 3, and the water-expandable rubber 12 is sandwiched and fixed. The water-expandable rubber expands in contact with rainwater or the like, and seals in a watertight manner without generating a gap.
i: A lid support ring 4 and a manhole cover 5 are attached above the inclined wall block 2.
j: Back-filling material and soil necessary for the outer periphery of the existing straight wall 1 are backfilled, the pavement roadbed 9 missing above is repaired, and the circular work board 7 is installed to complete the work.
The order of the above work procedures can be changed as necessary, and parallel work can be performed.

  In the first embodiment, since the existing straight wall 1 in the ground is used by being left behind, the removal work is not necessary. In addition, cement-based backing material is injected into the crack of the existing straight wall 1 from between the cylindrical body 3, which closes the crack gap in the existing straight wall 1 and also the existing straight wall 1 and the cylindrical body. 3 is connected to increase the strength. Further, since the cylindrical body 3 is on the inner side, water leakage and water inflow from the side surface of the existing straight wall are almost eliminated.

Further, the gap between the lower surface of the inclined wall block 2 and the upper end surface of the existing straight wall 1 and the upper end of the cylindrical body 3 is also made watertight by the water-expandable rubber 12 so that water leakage and water inflow can be substantially prevented.
Further, the strength of the straight wall itself is restored by the penetration of the backing material into the crack of the existing straight wall 1.

In the renewal structure G1 of the first embodiment, the vertical load and vibration of the passing vehicle acting via the upper member such as the manhole cover 5 are caused by the gravel support base 10 and the gravel support base 10 through the lower protrusion 2a of the inclined wall block 2. Then, since it works on the ground 8, the load / vibration acting on the existing straight wall 1 and the cylindrical body 3 is greatly reduced. Even if it acts, the load / vibration is buffered and loaded by the water-expandable rubber 12.
For this reason, in the renewal structure G1 of the first embodiment, the load / vibration acting on the existing straight wall 1 is greatly reduced, and the deterioration of the existing straight wall 1 after the update is stopped or slowed down, and the life of the manhole Can be made longer.

The second embodiment shown in FIGS. 4 and 5 is a renewal structure G2 of an example of a shallow manhole having a covering of about 1.2 m. In this shallow covering, the inclined wall block 2 of the first embodiment is not used, and a disk is used. The bottom base block 20 is used, and a lid support ring 24 is installed at the opening edge of the upper opening 20b of the bottom base block 20. The lower protrusion 20a on the outer periphery of the bottom block 20 is placed on a gravel support foundation 21, and the load and vibration applied to the upper manhole cover 25 and the lid support ring 24 are grounded via the gravel support foundation 21. 8, the further progress of further deterioration of the existing straight wall 26 is stopped so that the existing straight wall 26 and the cylindrical body 27 are not directly loaded.
In the second embodiment, since the upper end of the existing straight wall 26 is at a low position, the cylindrical body 27 of the same material of the cylindrical body 3 of the first embodiment is extended upward to the lower surface of the bottom block 20, By interposing a water-expandable rubber 28 during this period, water leakage and water inflow are prevented, and transmission of load and vibration to the lower cylinder 27 is reduced.

  Further, also in this embodiment, a cement-based backing material 29 flows between the existing straight wall 26 and the cylindrical body 27 and joins them, and the crack gap in the existing straight wall 26 is closed to leak water. Reinforce the restoration and strength.

Further, the space between the cylindrical body 27 extending upward and the lower and side surfaces of the bottom block 20, the upper end surface of the existing straight wall 26, and the support foundation 21 is filled and filled with soil or roadbed material 30. . By these, watertightness is ensured.
Although the said Example 1, 2 is the renewal structure of the existing manhole, strength reinforcement and lifetime improvement can be enabled by making it the same structure as the structure of a new manhole.

  The present invention is mainly a road manhole renewal structure / manhole structure, but it can also be used in manholes with liquid tanks and large water purification tanks below the ground.

G1 Renewal structure of Example 1 G2 Renewal structure of Example 2 1 Existing straight wall 1a Upper end of straight wall 2 Slanted wall block 2a Lower projection 2b Upper opening 3 Tubular body 3a Step 4 Lid support ring 5 Manhole cover 6 Sewer culvert DESCRIPTION OF SYMBOLS 7 Circular track board 8 Ground 9 Pavement road base 10 Support foundation 11 Backing material 12 Water expansible rubber 20 Bottom base block 20a Lower protrusion 20b Upper opening 21 Support foundation 24 Cover support ring 25 Manhole cover 26 Existing straight wall 26a Lower protrusion 27 Cylindrical body 28 Water-expandable rubber 29 Backing material 30 Roadbed material

The configuration of the present invention that solves this problem is
1) A resin foundation with a step attached to the inner surface of the existing straight wall in the ground where the step was removed was fitted, and a support foundation with gravel laid on the outer peripheral ground at a position lower than the upper end of the existing straight wall. A manhole cover, a lid support ring, and a slanted wall block are arranged in order from the top on the existing straight wall, and a lower protrusion provided on the lower outer periphery of the slanted wall block is grounded to the upper surface of the support base to A vertical load from the lid support ring and the inclined wall block is supported by the support foundation, and a water-expandable rubber is interposed between the lower surface of the lower portion of the inclined wall block, the upper end of the existing straight wall, and the upper end of the cylindrical body. 2) Manhole renewal structure kept in a watertight state 2) A plastic cylinder with a step attached to the inner surface of the existing straight wall inside the ground where the step has been removed protrudes higher than the upper end of the existing straight wall. The cylindrical body is fitted to Provide a support foundation with gravel on the outer peripheral ground lower than the upper end, and place a manhole cover, lid support ring and bottom base block in order from the top on the existing straight wall, and a lower protrusion provided on the outer periphery of the bottom base block Is grounded to the upper surface of the support base to support the vertical load from the manhole cover / lid support ring and the bottom base block with the support base, and a water-expandable rubber is interposed between the upper end of the cylinder and the bottom surface of the bottom base block. In addition, a manhole renewal structure that maintains the water tightness by filling the space surrounded by the upper end surface of the cylindrical outer wall and the existing straight wall, the support foundation, the bottom surface of the bottom base block, and the inner wall surface of the lower projection with soil. The above-mentioned 1) or 2), in which a cement-based backing material is press-fitted into the gap between the inner wall of the existing straight wall and the outer wall of the fitted cylinder, and the two are joined without gap to enhance the strength and water tightness. Updated manhole structure described ) A supporting foundation in which a plastic cylinder with a step attached to the inner surface is fitted inside a straight wall in the newly installed underground without a step, and gravel is laid on the outer peripheral ground at a position lower than the upper end of the straight wall. A manhole cover, a lid support ring, and a slanted wall block are arranged in order from the top on the straight wall, and a lower protrusion provided on the lower outer periphery of the slanted wall block is grounded to the upper surface of the support base so as to cover the manhole cover.・ The vertical load from the lid support ring and the slant wall block is supported by the support foundation, and a water-expandable rubber is provided in the gap between the lower surface of the bottom of the slant wall block, the upper end of the straight wall and the upper end of the cylindrical body. 5) Manhole structure held in a watertight state 5) A resin cylinder with a step attached to the inner surface of a straight wall inside a new ground without a step attached to the upper end of the cylinder from the upper end of the straight wall Fit to protrude high The support basic lined with gravel periphery ground position lower than the upper end of the cylindrical body is provided, along with arranging the manhole cover and the cover support ring and Sokoban block from top to bottom on the straight wall, provided on the outer periphery of the bottom plate block The lower protrusion is grounded to the upper surface of the support base to support the vertical load from the manhole cover / lid support ring and the bottom base block by the support base, and the water-expandable rubber is provided between the upper end of the cylinder and the bottom base block lower surface. was HazamaSo, yet maintaining the water-tightness by filling the soil in a space surrounded by a cylindrical outer wall the upper end surface of the straight wall and the supporting foundation and Sokoban block of the lower surface and the lower projecting portion of the inner wall, the manhole Structure 6) The above-mentioned 4) or the above, wherein a cement-based backing material is press-fitted into a gap between the inner wall of the straight wall and the outer wall of the fitted cylinder, and the two are joined without gaps to increase the strength and water tightness. 5) structure near the manhole described .

Claims (6)

  A resin cylinder with a step attached to the inner surface was fitted inside the existing straight wall in the ground where the step was removed, and a support foundation with gravel laid on the outer peripheral ground at a position lower than the upper end of the existing straight wall was provided. A manhole cover, lid support ring, and slant wall block are placed on the existing straight wall in order from the top, and the lower protrusion provided on the lower outer periphery of the slant wall block is grounded to the top surface of the support base to support the manhole cover and lid A vertical load from the ring and the inclined wall block is supported by the support foundation, and water-expandable rubber is interposed between the lower surface of the lower portion of the inclined wall block and the upper end of the existing straight wall and the upper end of the cylindrical body for watertightness. Manhole renewal structure held in a shape.   A plastic cylinder with the step attached to the inner surface of the existing straight wall in the ground where the step is removed is fitted so that the upper end of the cylindrical body protrudes higher than the upper end of the existing straight wall. A support foundation made of gravel is provided on the lower peripheral ground, and a manhole cover, a lid support ring, and a bottom block are arranged in order from the top on the existing straight wall, and the lower protrusion provided on the outer periphery of the bottom block is Support the vertical load from the manhole cover / lid support ring and bottom base block with the support base by grounding to the upper surface of the support base, and interposing a water-expandable rubber between the upper end of the cylinder and the bottom surface of the bottom base block, and A manhole renewal structure that maintains the watertightness by filling the space surrounded by the upper end surface of the cylindrical outer wall and the existing straight wall, the support foundation, the bottom surface of the bottom base block, and the inner wall surface of the lower protrusion with soil.   The strength and water tightness are improved by press-fitting a cement-based backing material into a gap between the inner wall of the existing straight wall and the outer wall of the fitted cylinder, and joining the two without gaps. Manhole update structure.   A resin base with a step attached to the inner surface is fitted inside the straight wall in the newly installed ground where no step is attached, and a support foundation in which gravel is spread on the outer peripheral ground at a position lower than the upper end of the straight wall. A manhole cover, a lid support ring, and a slanted wall block are arranged in order from the top on the straight wall, and a lower protrusion provided on the lower outer periphery of the slanted wall block is grounded to the upper surface of the support base to A vertical load from the lid support ring and the inclined wall block is supported by the support foundation, and a water-expandable rubber is provided in the gap between the lower surface of the lower portion of the inclined wall block, the upper end of the straight wall, and the upper end of the cylindrical body. A manhole structure that is kept watertight.   A plastic cylinder with a step attached to the inner surface of a straight wall in a newly installed underground without a step is fitted so that the upper end of the cylinder protrudes higher than the upper end of the straight wall. Provide a support foundation with gravel on the outer peripheral ground lower than the upper end, and place a manhole cover, lid support ring and bottom base block in order from the top on the existing straight wall, and a lower protrusion provided on the outer periphery of the bottom base block Is grounded to the upper surface of the support base to support the vertical load from the manhole cover / lid support ring and the bottom base block with the support base, and a water-expandable rubber is interposed between the upper end of the cylinder and the bottom surface of the bottom base block. In addition, the manhole structure maintains the water tightness by filling the space surrounded by the upper end surface of the cylindrical outer wall and the existing straight wall, the support foundation, the bottom surface of the bottom block, and the inner wall of the lower protrusion with soil.   The cement-based backing material is press-fitted into the gap between the inner wall of the straight wall and the outer wall of the fitted cylinder, and both are joined without gap to increase strength and water tightness. Manhole structure.

Images