JP2016023454A - Repair structure for existing manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repair structure that prevents deviation and falling, for repairing an existing manhole without a measure implemented for preventing deviation.SOLUTION: A repair structure is for an existing manhole configured by piling up cylindrical constituent members. A groove is formed from an inner peripheral surface side of the piled constituent members (a straight wall piece 2, an oblique wall piece 3) on at least three locations that almost equally divide a circumference of the inner peripheral surface, across a connecting part 10 of the piled constituent members. A shear-proof member (a shear plate 11) is inserted into the groove for connecting the piled constituent members via the shear-proof member, such that the shear-proof member resists forces of different directions that are exerted on the piled constituent members and then cause deviation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a repair structure for an existing manhole that prevents a displacement and a fall caused in an assembly-type existing manhole constructed by stacking a plurality of constituent members formed in a cylindrical shape.

  In the case of sewer pipes laid in the ground, a manhole is installed at each required position, and a plurality of reinforced concrete pipes are arranged between the manholes. As a manhole, an assembly-type manhole is generally installed. The assembly type manhole has a straight wall piece made of a cylindrical concrete piece, one end has the same diameter as the straight wall piece, and the other end has a diameter corresponding to the manhole cover, and some walls are inclined. The slant wall piece is configured by stacking a plurality of straight wall pieces and placing the slant wall piece on the uppermost stage.

  Conventionally, many assembly manholes are constructed by simply stacking straight wall pieces and slant wall pieces. For this reason, when a horizontal force is applied to the stacked straight wall pieces and slant wall pieces during an earthquake, there is a problem that a shift occurs due to the force. In order to solve this problem, in recent assembly manholes, the outer peripheral surfaces of the stacked straight wall pieces, or the outer peripheral surface of the straight wall pieces and the outer peripheral surface of the slant wall piece are connected by a steel plate, thereby causing the occurrence of deviation. It is preventing.

  Specifically, nuts are embedded in advance at a plurality of positions in the vicinity of both end portions of the outer peripheral surface of the straight wall piece and the inclined wall piece, and the connecting portions of the stacked straight wall piece and the inclined wall piece are traversed. The steel plate is arranged and the bolt is fastened to the buried nut, so that the straight wall piece and the slant wall piece are integrated through the steel plate. In this structure, when forces in different directions and forces of different magnitudes act on the stacked straight wall pieces and slant wall pieces, this force can be counteracted by the steel plate, thus preventing the occurrence of deviation. it can. Therefore, it is possible to take measures against deviation.

  However, the actual situation is that there are still many assembly manholes (existing manholes) that are laid in a state in which straight wall pieces and slant wall pieces are simply stacked. And in such an existing manhole, there is a possibility that the straight wall piece and the inclined wall piece may be displaced, or depending on the case, the tilting direction and angle may be different. For this reason, it is the actual situation that it is required to take measures to prevent such displacement and fall of the existing manhole.

  An object of the present invention is to provide a repair structure of an existing manhole that can prevent a slippage and a fall over an existing manhole that is not provided with a countermeasure against the slippage.

  In order to solve the above problems, the repair structure of an existing manhole according to the present invention is a repair structure of an existing manhole configured by stacking cylindrical components, and the inner peripheral surface of the stacked components is substantially equally divided. A configuration in which grooves are formed from the inner peripheral surface side across the connecting portions of the stacked component members in at least three places, and the shear resistant members are inserted into the grooves and stacked via the shear resistant members. The members are made continuous so that when the forces in different directions act on the stacked constituent members and try to shift them, the forces can be countered by the shear resistant member.

  In the repair structure of the existing manhole, it is preferable that the groove is formed across the connecting portion of the stacked component members, and a flat plate-like shear resistant member is inserted into the groove.

  Further, in the repair structure of the existing manhole, the groove is formed on the end side of the first groove and the first groove formed across the connecting portions of the stacked components. A second groove in a direction orthogonal to the first groove, and a shear resistant member inserted into the groove corresponds to the web corresponding to the first groove and the second groove. It is preferable to have a flange.

  In any of the existing manhole repair structures, it is preferable that the groove into which the shear resistant member is inserted is filled with resin.

  Furthermore, in any one of the existing manhole repair structures, a rubber sleeve is disposed on the inner peripheral surface side of the groove into which the shear-resistant member is inserted, and the diameter of the metal sleeve is increased on the inner peripheral surface side of the rubber sleeve. It is preferable that the member is disposed and the diameter-expanded member is expanded to be brought into pressure contact with the inner peripheral surface of the component member in which the rubber sleeves are stacked.

  In the repair structure of the existing manhole according to the present invention, it is possible to prevent the occurrence of displacement and collapse by repairing the cylindrical structural member made up of the straight wall piece and the inclined wall piece from the inner peripheral surface side. In other words, at least three locations where the inner peripheral surfaces of the connection parts of the stacked component members are substantially equally divided, a groove is formed across the connection part and a shear resistant member is inserted into the groove. The constituent members can be made continuous. For this reason, even if forces having different directions or sizes act on the stacked component members, it is possible to counteract the acting force by the shear resistant members provided in at least three locations. It is possible to prevent the members from shifting or falling over.

  In particular, when a groove is formed across the connecting portion of the stacked component members and a flat plate-like shear resistant member is inserted in the groove, it acts mainly in the horizontal direction of the stacked component members. It is possible to prevent the shift against the force to do.

  Further, the groove has a first groove that crosses the connection portion, and a second groove that is formed in a direction orthogonal to the end portion side of the first groove. When the web corresponding to the groove and the flange corresponding to the second groove are provided, the shift can be prevented by the web and the web and the flange can be prevented from falling.

  In addition, by filling the groove into which the shear resistant member is inserted with resin, it is possible to realize reliable integration of the stacked constituent members. In particular, when an elastic resin is filled, when different forces act on the stacked constituent members, this force can be absorbed. In addition, the elastic resin is elastically deformed, and the acting force is dispersed to obtain a substantially equally distributed load.

  Further, a rubber sleeve is disposed on the inner peripheral surface side of the groove into which the shear resistant member is inserted, and a metal diameter-expanding member is disposed on the inner peripheral surface side of the rubber sleeve. By pressing the sleeve against the inner peripheral surface of the constituent member, even if groundwater leaks from the connecting portion or groove of the constituent member, the groundwater can be blocked.

It is a schematic diagram explaining the repair structure of the existing manhole. It is an enlarged view explaining the principal part of FIG. It is a figure explaining the structure which has arrange | positioned the rubber sleeve to the inner peripheral surface side of the groove | channel which inserted the shearing-resistant member. It is a figure explaining the structure of the groove | channel and shear-resistant member which concern on 2nd Example.

  Hereinafter, the repair structure of the existing manhole according to the present invention will be described. The existing manhole which is mainly targeted by the present invention is an assembly-type manhole constructed by stacking one or a plurality of straight wall pieces and stacking an inclined wall piece on the uppermost stage. For this reason, the straight wall piece and the slant wall piece of the assembly-type manhole are the cylindrical components in the present invention.

  Therefore, in the present invention, the straight wall piece, the inclined wall piece, the adjusting ring installed on the upper portion of the inclined wall piece, and other cylindrical pieces are referred to as constituent members of the existing manhole. In addition, the component member does not necessarily need to be a cylindrical piece, and even a square piece can be a target. In addition, the structure of the connecting portion to which the stacked constituent members are connected is not limited, and the end surfaces of the constituent members arranged above and below the connecting portion as a boundary may be flat, or one of the constituent members may be An engagement protrusion may be formed and an engagement recess may be formed in the other component member.

  In the present embodiment, it is not necessary to arrange the shear resistant member at the connection portion between all the stacked components. That is, in the case of an existing manhole, the magnitude of the force acting according to the depth changes, so that the acting force can be ignored depending on the position of the stacked components. Therefore, it is not necessary to arrange a shear-resistant member at the connection part in such a part.

  In the present invention, when a force accompanying an earthquake or ground subsidence is applied to an existing manhole, there is a possibility that the component members stacked by this force may shift in the horizontal direction, or the upper component member and the lower component member The target is an existing manhole that might fall over. And by arranging the shear resistant member across the connection part of the stacked component members, the horizontal component of the acting force, or the horizontal component and the component in the direction of overturning the existing manhole (diagonal component), Prevents slipping and falling.

  The shear-resistant member needs to be disposed in at least three places that cross the connection portions of the stacked components and divide the inner peripheral surface substantially equally. In this way, by arranging the shear-resistant members in at least three places where the inner peripheral surface is substantially equally divided, even if the force acts from any direction in the horizontal plane against the stacked components, It becomes possible. For this reason, grooves are formed in at least three places that cross the connection portions of the stacked components and the inner peripheral surface is substantially equally divided, and a shear-resistant member is inserted into each groove.

  It is preferable to change the shape of the shear-resistant member in accordance with whether it is to resist the deviation generated in the stacked components or to resist the collapse. For example, in the case of countering the displacement of the constituent members in the horizontal direction, the shear resistant member may be formed in a plate shape or a cylindrical shape. However, when facing the collapse of the constituent members, the shear resistant member is preferably formed in an H-type, I-type, groove-type, Z-type or S-type having a web and a flange. In this case, the web mainly resists horizontal displacement, and the web and the flange oppose falling.

  The material and dimensions of the shear-resistant member are not particularly limited. Assuming the force acting in the event of an earthquake or ground change, calculate and set the horizontal and diagonal components of the assumed force as appropriate. Is preferred. As a material for constituting the shear resistant member, for example, a ferrous metal including steel or stainless steel or a non-ferrous metal including copper or aluminum alloy can be selectively employed. It is also possible to use a reinforced plastic containing FRP.

  The cross-sectional area of the plate-like shear resistant member is preferably set in relation to the allowable shear stress of the selected material and the assumed horizontal component of the force. The length is preferably dimensioned so that it can reliably cross the connecting portions of the stacked components and can function as a shear member while maintaining the posture inside the groove when a force is applied. . However, the width is regulated by the depth of the groove.

  Further, in the case of a columnar shear-resistant member, it is preferable that the surface that opposes the force acting on the stacked constituent members is a cross section having a diameter and a length. That is, the axial center of the columnar shear-resistant member is made to substantially coincide with the connection surface (surface parallel to the end face of the component member) at the connection portion of the component member, and the longitudinal direction is arranged in the thickness direction of the component member. Is preferred.

  The dimension of the flange of the shear resistant member having the web and the flange is preferably set in relation to the allowable bending stress of the selected material and the allowable shear stress and the oblique component of the assumed force. The web dimensions are preferably set in relation to the allowable shear stress and allowable tensile stress of the selected material and the oblique component of the assumed force. In the case of such a shear resistant member having a web and a flange, the web and the flange do not necessarily have to be integrated at the rolling stage, and may be formed by welding a flat bar to a desired shape.

  The groove crossing the connecting portion of the component member is preferably formed with a dimension that allows the shear-resistant member to be inserted reliably and easily. That is, the width, length, or diameter of the groove opened on the inner peripheral surface of the component member has a dimension with a margin with respect to the preset thickness, length, diameter, or length of the shear resistant member. Preferably it is.

  In particular, when the shear-resistant member has a web and a flange, a groove having a first groove for inserting the web and a second groove for inserting the flange is formed across the connecting portions of the stacked components. Is required.

  Moreover, although the dimension of the depth direction of a groove | channel is not specifically limited, It is not preferable that the formed groove | channel penetrates the wall of a structural member. However, if the depth of the formed groove is shallow, the posture of the inserted shear resistant member may not be stable and it may be difficult to reliably counteract the force acting on it. There is a risk of becoming. For this reason, it is preferable that the depth of the groove is about ¼ to ½ of the thickness of the wall of the constituent member.

  Accordingly, the dimensions of the groove and the shear resistant member can be appropriately set according to the conditions such as the wall thickness dimension of the constituent members constituting the existing manhole, the presumed force, and the material of the selected shear resistant member. preferable. For example, in the case of a plate-like shear resistant member, the groove width is preferably in the range of about 6 mm to about 15 mm, and the length is preferably in the range of about 70 mm to about 150 mm. In the case of a columnar shear resistant member, the diameter of the groove is preferably in the range of about 50 mm to about 80 mm.

  Since the dimension of the groove formed across the connecting part of the stacked components has a margin with respect to the dimension of the shear resistant member, a gap is formed between the two when the shear resistant member is inserted into the groove. Is done. For this reason, it is preferable to fill and seal the gap formed between the groove and the shear-resistant member. Although the kind of resin with which such a gap is filled is not limited, for example, a resin having adhesiveness or a resin having elasticity is preferable. An example of such a resin is an epoxy resin.

  Next, the repair structure of the existing manhole according to the first embodiment will be described with reference to FIGS. In the existing manhole A shown in the figure, a plurality of straight wall pieces 2 as component members are stacked on the upper portion of the foundation 1, and an inclined wall piece 3 as a component member is stacked on the uppermost stage, and a lid 4 is placed on the upper portion of the inclined wall piece 3. Is arranged and configured. An invert 5 is provided in the lowermost straight wall piece 1, and a concrete pipe 6 constituting a sewer pipe is connected to both sides of the invert 5. In particular, the existing manhole A is configured as a No. 1 manhole having an inner diameter of about 900 mm, and the wall thickness of the straight wall piece 2 and the inclined wall piece 3 is set to about 75 mm.

  In this embodiment, the connection portion 10 between the stacked straight wall pieces 2 and the connection portion 10 between the straight wall piece 2 and the slanted wall piece 3 are resistant to four places obtained by dividing the connection portion into approximately four equal parts. A shear plate 11 serving as a shear member is disposed. Even if the stacked components are the straight wall pieces 2 or the straight wall piece 2 and the slanted wall piece 3, the configuration of the connecting portion 10 is not changed. For this reason, the structure in the connection part 10 (henceforth only the connection part 10) of the straight wall piece 2 and the straight wall piece 2 is demonstrated typically. Of course, as described above, it is not necessary to arrange the shear plates 11 in all the connecting portions 10 of the existing manhole A.

  In particular, in the present embodiment, the shear plate 11 is disposed at a position where the inner peripheral surface of the connecting portion 10 is divided by approximately 90 degrees. That is, a linear groove 12 is formed that extends across the connecting portion 10 and continues to the upper and lower straight wall pieces 2, and the shear plate 11 is inserted into the groove 12. However, in the connecting portion 10 between the slanted wall piece 3 and the straight wall piece 2, the groove 12 formed in the slanted wall portion of the slanted wall piece 3 is refracted into a "<" shape. The shear plate 11 inserted into the groove 12 is also refracted in a “<” shape.

  The groove 12 has a length in the vertical direction of about 110 mm, a width of about 10 mm, and a depth in the wall thickness direction of about 30 mm that penetrates the upper and lower straight wall pieces 2. The method of forming such a groove 12 is not particularly limited, and the inner peripheral surface of the upper and lower straight wall pieces 2 is cut using a circular saw for cutting concrete, and the rounded arc portion is used for cutting concrete. You may cut using an end mill.

  The shear plate 11 inserted into the groove 12 is constituted by a steel plate having a thickness of about 5 mm, a width of about 25 mm, and a length of about 100 mm. This dimension is only an example, and basically is set in consideration of the allowable shear stress of the material and the horizontal component of the force acting on the existing manhole A as described above.

  Further, since the shear plate 11 is made of a steel plate, it is preferable that the shear plate 11 is subjected to rust prevention treatment by painting, plating, parkerizing, or the like. In particular, it is preferable to coat the surface of the shear plate 11 with an elastic resin so that the force can be dispersed and act as an evenly distributed load.

  The groove 12 into which the shear plate 11 is inserted is filled with a resin 13, and the filled resin 13 blocks a gap formed between the shear plate 11 and the groove 12. As this resin 13, it is possible to selectively use a resin having a function as an adhesive that bonds the shear plate 11 to concrete, or a resin that can maintain elasticity over a long period of time. In this embodiment, an epoxy resin or the like is used.

  In particular, when the shear plate 11 is inserted into the groove 12, the resin 13 may be filled in the groove 12 in advance, or the resin 13 may be filled after the shear plate 11 is inserted into the groove 12. When the shear plate 11 is inserted after the resin 12 is filled in the groove 12 in advance, no gap is generated in the groove 12. Further, when the resin 13 is filled after the shear plate 11 is inserted into the groove 12, it is possible to reliably insert the whole without causing the shear plate 11 to protrude toward the inner peripheral surface side of the groove 12. .

  After the shear plate 11 is securely inserted into the groove 12, the opening of the groove 12 in the connecting portion 10 may be smoothed so as to be substantially flush with the inner peripheral surfaces of the upper and lower straight wall pieces 2. preferable. As described above, by smoothing the opening portion of the groove 12, even if the water level including water rises inside the existing manhole A or when the dust flows in from the lid 4 portion, the dust can be removed. It is possible to prevent it from being caught.

  As described above, when the shear plate 11 is inserted into the groove 12 formed across the connecting portion 10, the force and the size are different from each other with respect to the straight wall pieces 2 arranged above and below the connecting portion 10. When a force acts, the shear plate 11 can counter this force. For this reason, a relative shift does not occur between the upper and lower straight wall pieces 2.

  Moreover, it is not preferable that the surrounding groundwater flows in due to the formation of the groove 12 in the existing manhole A. Moreover, in the case of the existing manhole A whose service period has been prolonged, there is a risk that the connecting portion 10 will deteriorate and groundwater will flow in. For this reason, it is preferable that the opening portion of the groove 12 in which the shear plate 11 is inserted and the gap 13 is filled with the resin 13 and the connection portion 10 have a water shielding structure.

  When groundwater flows in via the connection part 10, it is often the connection part 10 relatively below the existing manhole A. For this reason, in this embodiment, as shown in FIG. 3, a rubber sleeve 15 is arranged on the inner peripheral surface side of the connecting portion 10 between the straight wall pieces 2 to cover all the grooves 12, and An enlarged member 16 made of a stainless steel plate is disposed on the peripheral surface side. And the rubber sleeve 15 is press-contacted to the internal peripheral surface of the straight wall piece 2 including the connection part 10 by expanding the diameter expansion member 16 using a jack or a wedge (not shown).

  A plurality of protrusions 15a are formed at both ends of the rubber sleeve 15 in the width direction and wider than both ends of the groove 12 in the length direction. It is deformed by being pressed against the inner peripheral surfaces of the straight wall pieces 2. For this reason, the connection part 10 and the groove | channel 12 will be surrounded by the processus | protrusion 15a, and even if groundwater leaks into this part, it does not flow into the existing manhole A. Moreover, the diameter-expanding member 16 whose diameter has been expanded supports the straight wall pieces 2 sandwiching the connecting portion 10, and can contribute to preventing the shift.

  When a cylinder is used as the shear resistant member, it is possible to use a round bar made of steel having a diameter of about 50 mm and a length of about 25 mm. When arranging such a columnar shear-resistant member in the connection portion 10, a groove is formed by cutting the inner peripheral surface of the upper and lower straight wall pieces 2 in a cylindrical shape with a core cutter around the connection portion 10, It is possible to insert and arrange a columnar shear-resistant member in this groove.

  Next, an existing manhole repair structure according to the second embodiment will be described with reference to FIG. In this embodiment, the shape of the shearing member and the shape of the groove into which the shearing member is inserted are different from those of the first embodiment, but the other parts are the same. For this reason, in the figure, the same reference numerals are given to the same parts and the parts having the same functions as those in the first embodiment, and the description will be omitted.

  In this embodiment, an I-type shear member 21 having a web 21a and a flange 21b and having an I-shape is used as a shear-resistant member. The web 21a has a function similar to that of the shear plate 11 described above, and the flange 21b has a function of preventing the lower wall piece 2 and the upper wall piece 2 from collapsing relative to each other.

  Further, the groove 22 into which the I-type shear member 21 is inserted has a first groove 22 a formed across the connecting portion 10, and the inner peripheral surface of the lower straight wall piece 2 and the upper straight wall piece 2. And a second groove 22b formed in the circumferential direction. The dimension of the groove 22 is formed to have a dimension larger than the thickness, height, and width dimension of the I-type shear member so that the I-type shear member 21 can be easily accommodated.

  When the I-type shear member 21 is inserted into the groove 22, the gap formed between them is filled with the resin 13.

  In the present embodiment, the horizontal component of the force acting on the existing manhole A can be countered by the web 21a as in the first embodiment. Further, it is possible to counter the component in the direction in which the existing manhole A is overturned by the flange 21b and the web 21a.

  That is, when a force in the direction of overturning the existing manhole A due to the shearing force acts on the existing manhole A, for example, when the upper straight wall piece 2 is inclined relative to the lower straight wall piece 2 The upper and lower flanges 21b come into contact with the second groove 22b, respectively, and counteract the shearing force acting on the flange 21b. The web 21a opposes the acting tensile force and opposes the acting shear force. Therefore, it is possible to prevent a fall and a horizontal shift that may occur between the upper straight wall piece 2 and the lower straight wall piece 2 constituting the existing manhole A.

  The repair structure of an existing manhole according to the present invention can be used for both a manhole made of a cylindrical concrete piece and a vertical shaft including a manhole made of a square tubular concrete piece.

A existing manhole 1 foundation 2 straight wall piece 3 slant wall piece 4 lid 5 invert 6 concrete pipe 10 connecting portion 11 shear plate 12 groove 13 resin 15 rubber sleeve 15a protrusion 16 diameter expanding member 21 I-type shearing member 21a web 21b flange 22 groove 22a first groove 22b second groove

Claims (5)

It is a repair structure of an existing manhole constructed by stacking cylindrical components,
Grooves are formed from the inner peripheral surface side across at least three locations where the inner peripheral surfaces of the stacked component members are substantially equally divided across the connecting portions of the stacked component members, and a shear resistant member is inserted into the groove Then, the constituent members stacked through the shear resistant member are continued,
A repair structure for an existing manhole, wherein when the forces in the directions different from each other act on the stacked component members and try to shift, the shear-resistant members can counter the forces.   2. The repair structure for an existing manhole according to claim 1, wherein the groove is formed across a connecting portion of the stacked component members, and a flat plate-like shear resistant member is inserted into the groove. .   The groove has a first groove formed across the connecting portions of the stacked component members, and a second groove formed on the end side of the first groove and perpendicular to the first groove. And a shear-resistant member inserted into the groove has a web corresponding to the first groove and a flange corresponding to the second groove. An existing manhole repair structure according to claim 1.   4. The repair structure for an existing manhole according to claim 1, wherein the groove into which the shear resistant member is inserted is filled with resin.   A rubber sleeve is disposed on the inner peripheral surface side of the groove into which the shear-resistant member is inserted, and a metal diameter-expanding member is disposed on the inner peripheral surface side of the rubber sleeve. The repair structure for an existing manhole according to any one of claims 1 to 4, wherein the sleeve is pressed against the inner peripheral surface of the stacked component member.

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