JP6061238B2 - Tubular buried object and manufacturing method thereof - Google Patents

Description

  The present invention relates to a tubular embedment that imparts earthquake resistance and water tightness to pipes that have already been buried or will be buried in the future, and a method for manufacturing the same.

When a high-level earthquake occurs, it will cause tremendous damage to pipes (tubular objects) buried underground such as sewers, rainwater drainage, electricity / communications, underground passages, etc., and it will take a lot of time and money to restore them. Cost.
Damage to pipes due to earthquake motion or uneven settlement of the ground during an earthquake includes cracks, breakage, slipping out, slipping, etc., but these are concentrated in the joints of pipes or where the ground changes. To do.

In particular, if the pipe is pulled out or displaced at the seam, or if the pipe breaks or breaks at a sudden change in the ground, water will flow into the pipe, sediment will flow into or accumulate, and the flow-down function will be hindered. .
Recently, flexible joints and flexible members having earthquake resistance have been used as countermeasures against such damage to pipes when laying or building pipes.

  In the inventions described in Patent Document 1 and Patent Document 2, an annular sheet member (made of rubber) is installed at the joint, a cylindrical sleeve made of stainless steel or the like is expanded from the inside thereof, and the annular sheet member is connected to the pipe line. It is pressed on the inner peripheral surface.

  In this method, in the case of a circular box, by expanding the diameter of the cylindrical sleeve, it is possible to press the annular sheet member, which is a water-stopping member, against the inner peripheral surface of the pipe wall with an equal force. Even when the pipe rod is pulled out or displaced, it is possible to ensure water tightness by keeping the pressing force following the movement.

JP 2006-144229 A JP 2006-83888 A

  However, those described in Patent Document 1 and Patent Document 2 have the following problems.

  (1) In the above method, the annular sheet member cannot be pressed against the rectangular or horseshoe-shaped tube rod with equal force.

  (2) There is a method of driving the hole-in anchor into the pipe rod and fixing the annular sheet member with bolts. In this case, inflow of earth and sand can be prevented to some extent, but when water pressure is applied, In the meantime, the applied pressure is weaker than that in the vicinity of the bolt, and water leakage occurs from this portion, so it is difficult to ensure reliable water tightness.

  (3) Although it is conceivable to use a bolt and fixing the annular sheet member together by fixing with a bolt and an adhesive, water or the like may flow in the existing pipe so that reliable bonding is difficult. Moreover, there is a possibility that the adhesion may be peeled off when moving during an earthquake.

  (4) Although a method of pressing with a rigid steel material or the like is also conceivable, in this case, the member protrudes on the surface of the water flow so that the flow down function is hindered. Moreover, since a member becomes large, it is not realistic.

  In order to solve the above-described problems in the prior art, the present invention creates a tubular buried object that improves the earthquake resistance and water tightness of a tubular buried object (pipe) that is already buried or will be buried in the future, and a method for manufacturing the same. This is the issue.

Among the means for solving the above problems, the configuration of the first invention is as follows.
In the tubular buried object in which a fragile part that induces cracks is formed in the joint part or wall surface between the tubular embedded objects arranged in front and rear,
Arranged between a pair of concave grooves that are circumferentially recessed along the wall surface, and between one concave groove and the other concave groove at the positions on both sides of the wall surface of the tubular embedded object and the seam portion or the fragile portion And a sheet member formed in an annular band shape covering the joint portion or the fragile portion, and a circle formed in a linear or arc shape that is divided into a plurality of pieces to be held and fixed together with the sheet member in the concave groove A fixing member made of steel or steel pipe ,
It is said that a plurality of fixing members are inserted into the concave grooves and arranged circumferentially.

In the first invention, the seam portion or the fragile portion is covered with a sheet member to prevent water intrusion into the tubular buried object or inflow and accumulation of earth and sand, but a pair formed on both sides of the seam portion or the fragile portion. The fixing of the sheet member is achieved by inserting the fixing member into the concave groove together with the sheet member.
Also, by covering the wall surface of the tubular buried object with a ring-shaped sheet member in the circumferential direction without any breaks, cracks generated in the fragile part due to earthquake motion or unequal subsidence, etc. Achieve prevention of inflow.
Further, in the configuration in which the fixing member is formed of a steel pipe, after the fixing member is inserted into the concave groove, the fixing member is pressurized and deformed into a substantially elliptical cross section in the concave groove width direction. The sheet member is securely held and fixed by obtaining a stronger reaction force.

  The concave groove may be formed in advance in the vicinity of the joint position (both ends of the tubular embedded object) that becomes the joint portion of the tubular embedded object after the embedding, in the case of manufacturing the tubular embedded object. It may be formed by cutting at positions on both sides of the joint portion.

  Examples of the tubular embedment include concrete flowing water pipes, but are not limited to general cylindrical pipe culverts. For example, rectangular box culverts, polygonal or horseshoe-shaped pipes are used. It may be a tube tub composed of other shapes such as a jar.

  According to another configuration of the first invention, in the invention described in claim 1, sandwiching portions having a U-shaped cross section are formed at both ends in the width direction of the sheet member.

  In the above configuration, the sheet member and the fixing member can be easily inserted into the concave grooves, and the sheet member can be reliably fixed.

  According to another configuration of the first invention, in the invention according to claim 1 or 2, the sheet member includes a bellows-like stretchable portion.

  In the above configuration, the overall size of the sheet member can be reduced, and the bellows-like stretchable part gives the sheet member a large extension allowance, particularly when a large gap occurs in the joint part. Is possible.

  According to another configuration of the first invention, in the invention according to any one of the first to third aspects, a reinforcing member having a U-shaped cross section is provided in the pair of concave grooves. Is.

  In the above configuration, by increasing the accuracy of the groove, it is possible to prevent a reduction in the pressing force that presses the sheet member between the fixing member and the wall surface of the groove. As the material of the reinforcing member, metal is preferable, and stainless steel excellent in strength and rust prevention effect is particularly preferable.

According to another configuration of the first invention, in the inventions according to claims 1 to 4 , the steel pipe has an elliptical cross section.

  In the above configuration, it is easy to insert the fixing member into the groove having a narrow width, and the fixing member is pressed and deformed in the groove so that the sheet member is moved in the groove width direction with a greater force. By crimping, the fixing member is surely prevented from falling off.

According to another configuration of the first invention, in the invention according to any one of claims 1 to 6 , a pair of concave grooves, a sheet member, and a fixing member are provided on the inner wall surface of the tubular embedded object. It is said.

  That is, the pair of concave grooves, the sheet member, and the fixing member can be provided on the inner wall surface of the tubular embedded object, or can be provided on the outer wall surface of the tubular embedded object as long as it is a tubular embedded object before being embedded.

According to another configuration of the first invention, in the invention according to any one of claims 1 to 7, a protective cover for covering the sheet member is provided.

  In the above configuration, by covering the surface of the sheet member with a protective cover, the seam portion of the tubular embedded object is opened due to earthquake motion or the like, and when the pressure of earth or sand or water acts on the sheet member, the sheet member expands due to the pressure and the tubular embedded Prevents protruding inside the object.

According to another configuration of the first invention, in the invention according to claim 8 , the protective cover includes a pair of end covers that are fixed to the tubular embedded object side and respectively cover both ends of the sheet member, and both ends. The sheet cover is configured to have a central cover that covers the central part of the sheet member excluding and is slidably attached to the end cover.

  In the above configuration, even when the seam portion of the tubular embedded object is opened due to an earthquake motion and the sheet member is stretched and deformed, the protective cover slides to follow the sheet member to protect the sheet member even after the deformation, and the sheet member This swells due to the pressure of earth or sand or water, and achieves the prevention of the inward projection of the tubular buried object.

According to another configuration of the first invention, in the invention according to any one of the first to ninth aspects, the falling member prevents the fixing member from coming out of the groove at a position facing the groove. It is said that a member is provided.

  With the above configuration, the prevention of the fixing member from falling out of the concave groove is more reliably achieved.

According to another configuration of the first invention, in the invention described in claim 10 , a part of the end cover is made to face the concave groove to be a drop-off preventing member.

  In the above configuration, the fixing member is prevented from falling out of the recessed groove in the slidably attached protective cover.

Moreover, the structure of 2nd invention is the manufacturing method of the tubular embedment described in any one of the above,
A sheet member is disposed between the first step of forming a pair of concave grooves on both sides of the wall surface of the tubular embedded object and sandwiching the joint portion or the fragile portion, and one concave groove and the other concave groove. A second step of covering the joint portion or the fragile portion, and inserting a fixing member made of a round steel or steel pipe formed into a plurality of linear or arcuate shapes into each of the pair of concave grooves together with the sheet member And a third step of fixing the sheet member.

In the above configuration, the seam or weakened portion covered with a sheet member, by the fixing member to insert into the pair of grooves formed on both sides of the seam portion or the weakened portion, tightly crimp the sheet member by a fixing member Thus, the manufacturing method of the tubular embedded object to be held and fixed is achieved.

According to another configuration of the second invention, in the invention according to claim 12 , after the first step of forming the pair of grooves, the inner surfaces of the pair of grooves are formed from a U-shaped cross section. It has the process of providing the reinforcing member which becomes.

  With the above-described configuration, it is possible to achieve a constant pressing force for pressing the sheet member in the groove.

According to another configuration of the second invention, in the invention according to claim 12 or 13 , the fixing member is pressurized after the third step of inserting the fixing member having a hollow circular cross section into the groove. It includes a step of crushing into a substantially elliptical cross section in the width direction of the groove.

  In the above configuration, the crimping force to the sheet member is increased by crushing the fixing member in the concave groove.

According to another configuration of the second invention, in the invention according to any one of claims 12 to 14 , the first to third steps are performed on the inner wall surface of the tubular embedded object. It is.

  In the above configuration, the sheet member can be quickly and easily attached regardless of whether it is a tubular buried object before being buried or an existing tubular buried object.

Since the present invention has the above-described configuration, the following effects can be obtained.
In 1st invention, it can be set as the tubular embedment which consists of an earthquake-resistant joint structure provided with high watertightness regardless of the shape whether the shape of the tubular embedment is circular or rectangular. And since it is a simple structure, it can construct even under a certain amount of flowing water, and construction or manufacturing cost can be reduced.
Further, since the pair of concave grooves are formed circumferentially along the inner surface of the tubular embedded object, and the sheet member is formed in an annular shape and the fixing member is formed in a linear shape or an arc shape, the tubular embedded object is formed of the sheet member. Since it can be held and fixed in a state of covering the inner surface of the outer peripheral surface without any breaks, it is possible to reliably prevent water from entering from the joint portion or the fragile portion or inflow of earth and sand.
Moreover, what formed the fixing member with the steel pipe is an inexpensive member, and since it can process easily according to the shape of a tubular embedded object, construction cost can be made low. Moreover, since a steel pipe is accommodated in a ditch | groove after construction and it does not protrude to the flowing water surface side, the fall of a flow-down function can be prevented.

  Further, in the configuration in which the sandwiching portions having a U-shaped cross section are formed at both ends in the width direction of the sheet member, the sheet member and the fixing member can be easily inserted into the recessed grooves, and the sheet Since the member can be temporarily fixed to the extent that the member does not fall off, the workability is improved. In addition, when the sheet member is installed and fixed, there is no protrusion of both ends of the sheet member, so that the flow-down function is not hindered.

  Further, in the configuration in which the sheet member includes the bellows-like stretchable part, particularly in an earthquake or the like, a large external force is applied to the joint portion (joint portion) between one tubular embedded object and the other tubular embedded object. Even when they are separated from each other and are greatly displaced in the axial direction or the radial direction, the bellows-like stretchable part extends following these movements, so that water intrusion and inflow of earth and sand into the pipe rod are prevented. Prevention can be achieved effectively. Moreover, when using the sheet | seat member which does not have a bellows-like expansion-contraction part, the sheet material which is rich in a stretching property is selected.

  In addition, since the existing tubular buried works under severe conditions, it is difficult to cut the depth, width, and height dimensions of the groove with high accuracy, such as meandering in the groove. Construction errors are likely to occur.

  Therefore, in a configuration in which a reinforcing member having a U-shaped cross section is provided in a pair of concave grooves, problems such as bending of the concave grooves, uneven width, or missing corners of the grooves occur. However, it is possible to maintain the accuracy of the concave groove and prevent a decrease in the pressure-bonding force for pressing the sheet member. Therefore, when water pressure is applied or during an earthquake, the fixing member falls out of the recessed groove, and it becomes impossible to hold and fix the sheet member, so that secondary disasters such as inundation and inflow of earth and sand may occur. It becomes possible to prevent.

  In addition, in the configuration in which the steel pipe has an elliptical cross section, while facilitating insertion of the fixing member into the concave groove with a narrow width dimension, in a state where the fixing member is pressed and deformed in the concave groove, Since the repulsive force from the sheet member can be increased, the sheet member can be securely held and fixed with a stronger clamping force, so that not only the workability for inserting the fixing member is improved, but also the holding force is reduced. The effect to improve is also acquired.

  In addition, in the configuration in which a protective cover for covering the sheet member is provided, the sheet member is protected from wear and damage, and the joint portion of the tubular embedded object is opened by an earthquake motion, so that pressure such as earth or sand or water is applied. When acting on the sheet member, it is possible to prevent the sheet member from expanding due to pressure and projecting to the inside of the tubular embedded object.

  In addition, the protective cover is fixed to the tubular embedded object side and covers a pair of end covers that respectively cover both end portions of the sheet member, and covers the center portion of the sheet member excluding both end portions and is slidable with respect to the end cover. In the configuration with the attached central cover, even if the seam portion of the tubular embedded object is opened due to an earthquake motion or the like, and the pressure of earth or sand or water acts on the stretched and deformed sheet member Since it becomes possible to prevent the swollen sheet member from projecting to the inside of the tubular embedded object, it is possible to prevent a significant decrease in the flow-down function.

  Further, in the configuration in which the fixing member that prevents the fixing member from coming out of the concave groove is provided at a position facing the concave groove, by preventing the fixing member from falling out of the concave groove, The holding and fixing state can be maintained.

  Further, in the configuration in which a part of the end cover is made to face the recessed groove to prevent the falling member, the fixing member is prevented from falling off from the recessed groove in the slidably attached protective cover. This can be achieved with a simple configuration without using any member.

In addition, in the second invention, there is provided a method for manufacturing a tubular buried object that can provide an earthquake-resistant joint structure having high water tightness to an existing tubular buried object as well as a tubular buried object to be laid from now on. can do.
In addition, the present invention can be applied to all tubular objects regardless of the shape of the tubular object, such as cylindrical, rectangular, polygonal, or horseshoe-shaped.

  Further, in the configuration having a step of providing a reinforcing member having a U-shaped cross section on the inner surface of the pair of concave grooves after the first step of forming the pair of concave grooves, the accuracy of the concave configuration is low. Even if it is a ditch | groove or a ditch | groove with low intensity | strength, a sheet | seat member can be fixed now reliably.

  Further, in the configuration including the step of crushing the fixing member into a substantially elliptical cross section after the third step of inserting the fixing member having a hollow circular cross section into the concave groove, the sheet member is pressed with a larger crimping force. Since it can be held and fixed, the fixing member and the sheet member are not easily detached from the concave groove.

  Further, in the configuration in which the first to third steps are performed on the inner wall surface of the tubular embedded object, since the sheet member and the like can be attached from the inside of the pipe line, the periphery of the existing tubular embedded object It is not necessary to excavate and can be performed quickly and easily as compared with the case of attaching to the outer wall surface.

It is a perspective view which shows a box culvert as a tubular buried thing in embodiment of this invention. It is a perspective view which expands and shows the cross section in the II-II line | wire of FIG. It is sectional drawing which expands and shows a ditch | groove part as 1st Example of this invention. A is an enlarged sectional view of a concave groove showing a first embodiment of the reinforcing member, and B is a sectional view showing a second embodiment of the reinforcing member. It is sectional drawing which expands and shows a ditch | groove part as 2nd Example of this invention. The fragmentary sectional view of other examples of a sheet member is shown, A shows the state before change, and B shows the state after change. It is a fragmentary sectional view expanding and showing other examples of a sheet member. It is sectional drawing which shows a part of tubular embedding thing as 1st Example which provided the protective cover. It is sectional drawing which shows a part of tubular embedding thing as 2nd Example which provided the protective cover. It is sectional drawing which shows a part of tubular embedding thing as 3rd Example which provided the protective cover. It is a perspective view which shows a partial structure of the protective cover of 3rd Example. It is sectional drawing which shows the Example which provided the protective cover of 3rd Example in the box culvert as a tubular embedment. It is sectional drawing which shows a part of tubular embedding thing as 4th Example which provided the protective cover.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing a tubular buried object and a manufacturing method thereof as an embodiment of the present invention, FIG. 2 is a perspective view showing an enlarged cross section taken along line II-II in FIG. 1, and FIG. FIG. 4A is an enlarged cross-sectional view of a concave groove showing a first embodiment of the reinforcing member, FIG. 4B is a cross-sectional view showing a second embodiment of the reinforcing member, and FIG. Sectional drawing which expands and shows a ditch | groove part as 2nd Example of this invention, FIG. 6 shows the fragmentary sectional view of the other Example of a sheet | seat member, A is a state before a fluctuation | variation, B is a state after a fluctuation | variation. Show.

  The tubular buried object 1 of the present invention is a concrete box culvert 2 having a rectangular shape as shown in FIG. The box culvert 2 has four inner wall surfaces composed of an upper wall surface 2a, a lower wall surface 2b, a left wall surface 2c and a right wall surface 2d, and inclined surfaces 2e, 2e, 2e and 2e at corners where these four inner wall surfaces are adjacent to each other. It is configured. The length direction of the box culvert 2 is between the front end portion 2A which is one open end and the rear end portion 2B which is the other open end. Such a box culvert 2 is formed in the ground in a state in which the rear end 2B of the box culvert 2 provided at the front stage in the length direction is connected to the front end 2A of the box culvert 2 provided at the rear stage. Buried.

  Here, it is assumed that cracks have occurred on the weak wall 3 that induces cracks on the lower wall surface 2b of the box culvert 2, for example, due to seismic motion after burial or uneven settlement of the ground. And the manufacturing method of the tubular buried object which improves the earthquake resistance and water tightness in this case is demonstrated.

  In the first step, the inner wall surface of the box culvert 2, that is, the lower wall surface 2 b on which the weakened portion 3 is formed, and the width of the box culvert 2 at positions on both sides that are approximately equidistant from the end of the weakened portion 3 in the length direction. A pair of concave grooves 4 (concave groove 4a and concave groove 4b) having a dimension of about 20 mm and a depth of about 30 mm are recessed at an average distance L1. The pair of concave grooves 4 (the concave grooves 4a and the concave grooves 4b) are formed on the other inner wall surfaces, that is, the inner wall surfaces of the upper wall surface 2a, the left wall surface 2c, the right wall surface 2d, and the four inclined surfaces 2e therebetween. Are continuously provided in parallel with each other while maintaining the average distance L1.

  In the second step, the ring-shaped sheet member 6 is installed from the inside of the box culvert 2 so as to cover the fragile portion 3 and the pair of concave grooves (the concave groove 4a and the concave groove 4b) at both ends thereof. It is preferable that the ring-shaped sheet member 6 has a width W1 that is slightly wider than the average distance L1 between the one concave groove 4a and the other concave groove 4b in that it can be fixed with a margin. In addition, the sheet member 6 is preferably made of rubber having flexibility and waterproofness, strong tensile strength, and stretchability.

In a third step, by inserting with a fixing member 8 made of round steel 8a or steel pipe 8b so as to be sandwiched together from the surface side of the sheet member 6 in the one of the groove 4a (clamping pieces), the sheet member 6 One end in the width direction is held and fixed in one concave groove 4a. Similarly, the other fixing member 8 is inserted into the other concave groove 4b from the surface side of the sheet member 6 to hold and fix the other end in the width direction of the sheet member 6 in the other concave groove 4b ( (See FIG. 3).

  The range of the outer dimension φ of the fixing member 8 is larger than W2-2 × t, where the thickness of the sheet member 6 is t and the width of the groove 4 is W2, and the width W2. Can be appropriately determined within a smaller range (W2> φ> W2-2 × t). Thereby, it becomes possible to hold and fix the sheet member 6 from both sides of the groove 4 with a strong pressure bonding force.

  Further, the outer dimension φ of the fixing member 8 is preferably equal to or less than H−t (φ ≦ H−t), where H is the depth dimension of the concave groove 4. By setting within this range, the fixing member 8 is completely accommodated in the concave groove 4 and does not protrude toward the water surface, so that it is possible to prevent the flow-down function in the tubular buried object 1 from being lowered. It becomes.

As shown in FIG. 3, when the fixing member 8 made of round steel 8 a is inserted into the concave groove 4 together with the sheet member 6, the sheet member 6 is mainly compressed and deformed in the concave groove 4 by receiving pressure in the width direction. Therefore, the sheet member 6 can be firmly held and fixed. The box culvert 2 manufactured by such a process becomes a tubular embedded 1 having excellent earthquake resistance and water tightness against cracks generated in the weakened portion 3 that induces cracks.

The fixing member 8 does not need to be ring-shaped and can be appropriately divided in consideration of workability. The sum of the lengths of the individual fixing members 8 is obtained from four inner wall surfaces composed of the upper wall surface 2a, the lower wall surface 2b, the left wall surface 2c, and the right wall surface 2d, and the inclined surface 2e at the corner where these inner wall surfaces are adjacent to each other. Thus, the length may be the same as or slightly shorter than the length of the inner circumferential surface of the box culvert 2. By using a plurality of fixing members 8, each wall surface or inclined surface 2e can be firmly fixed, and by dividing the fixing member 8 into a plurality of parts, the work efficiency at the time of pinching can be improved compared to a ring shape. Can be increased.

  In addition, when the shape of the tubular embedment 1 is cylindrical, the same effect as described above can be expected by using the arc-shaped fixing member 8 having an arbitrary length dimension.

Further, as shown in FIG. 4A, a step of providing reinforcing members 9 each having a U-shaped cross section in the pair of concave grooves 4 may be introduced after the second step. The reinforcing member 9 is preferably made of metal, for example, stainless steel that is strong in strength and also has a rust preventive action. Further, when the sheet member 6 is inserted into the concave groove 4, in order to prevent the reinforcing member 9 or the sheet member 6 from being damaged by the corner portion of the concave groove 4, the reinforcing member 9 is arranged at the upper end as shown in FIG. 4B. It is good also as cross-sectional shape which provided the extended part 9b and 9b which extended the part 9a to the side, and provided the R part 9c which made the curved shape in the corner | angular of the upper end part 9a and the extended part 9b. The extending portions 9b, 9b may be embedded in the lower wall surface 2b, which is one wall surface of the box culvert 2, or may be provided so as to be exposed on the lower wall surface 2b.

  By providing the U-shaped reinforcing member 9 in the concave groove 4, for example, even if a defect such as bending, non-uniform width, or lack of corners occurs in the concave groove 4 after being provided with a concave, The dimensional accuracy of the groove 4 can be maintained at a high level. For this reason, the applied pressure acting on the flexible sheet member 6 provided between the concave groove 4 and the fixing member 8 can be made uniform over the entire circumference of the concave groove 4. For this reason, it is possible to prevent the sheet member 6 and the fixing member 8 from falling off, and to ensure more reliable watertightness.

Further, a reinforcing member 9 made of shaped cross-section U as shown in FIG. 4A, by a shape narrower than the width W4 of the bottom portion 9d of the width W3 of the upper end portion 9a, the fixed member after clamping entrance It becomes possible to make it difficult for the 8 to come out of the concave groove 4, and to prevent the sheet member 6 from falling off.

When a steel pipe 8b is used as the fixing member 8, as shown in FIG. 5, the fixing member 8 having a hollow circular cross section is provided after the third step of inserting the fixing member 8 into the concave groove 4 together with the sheet member 6. May be pressed by a hydraulic jack or the like and crushed in the width direction of the groove to be deformed into a substantially elliptical shape. When this step is performed, the compressive deformation of the sheet member 6 can be increased in the groove width direction, and the tubular embedded object 1 that can hold and fix the sheet member 6 more firmly can be obtained.

Note that the fixing member 8 made of the steel pipe 8b having a substantially elliptical cross section may be prepared in advance and inserted into the pair of concave grooves 4 together with the sheet member 6. In this case, since the major axis of the fixing member 8 is inserted in a state of being perpendicular to the lower wall surface 2b, the fixing member 8 can be easily inserted into the concave groove 4. In addition, the sheet member 6 is further strengthened in the same manner as described above by pressing the fixing member 8 with a jack or the like in the concave groove 4 after the pinching and deforming the major axis so as to be substantially parallel to the lower wall surface 2b. It becomes possible to hold and fix to.

  Regarding the joint portion between the rear end portion 2B of the box culvert 2 provided at the front stage and the front end portion 2A of the box culvert 2 provided at the rear stage, the above-described weakened portion 3 is regarded as a joint portion, As one step, one groove 4a is formed in the rear end 2B of the front box culvert 2 and the other groove 4b is formed in the front end 2A of the box culvert 2 on the rear stage. It can be set as the tubular buried object 1 provided with high watertightness and earthquake resistance.

  The manufacturing of the tubular embedded object 1 by such a manufacturing process is performed by providing a pair of concave grooves 4 (4a, 4b) in advance at the front end portion 2A and the rear end portion 2B of the box culvert 2, so that the tubular embedded object 1 is manufactured. The seismic resistance can be performed at the time of embedment, or can be performed on a tubular embedment 1 that is already embedded and used.

  In addition, in order to improve the reliability of the water tightness of the seam part in the ground motion and the uneven settlement of the ground at the time of the earthquake, the width dimension W1 is further increased so that a certain margin is created for the assumed fluctuation amount. Although it is preferable to use a wide sheet member 6, there is a limit to using a wide sheet member 6 due to cost or workability restrictions.

  Therefore, for example, as shown in FIGS. 6A and 6B, the sheet member 6 can be accommodated by including a bellows-like stretchable portion 6A. As shown in FIGS. 6A and 6B, the expansion / contraction part 6A may have a configuration in which the entirety of the sheet member 6 excluding both ends is an accordion-type expansion / contraction part 6A, or a configuration in which a part of the intermediate part is formed in an accordion shape. It may be.

  As shown in FIG. 6A, the stage before the change in which the seismic motion and unequal subsidence occur, that is, the rear end 2B of the preceding box culvert 2 and the front end 2A of the subsequent box culvert 2 are connected to form the joint J. In the formed state, the stretchable portion 6A is in a contracted state. Then, as shown in FIG. 6B, seismic motion or uneven settlement occurs, and for example, the rear end portion 2B of the preceding box culvert 2 and the front end portion 2A of the subsequent box culvert 2 are separated along the axial direction. When the gap S is generated in the meantime, the expansion / contraction part 6 </ b> A greatly extends in the expansion / contraction direction of the sheet member 6, so that the watertightness can be maintained even after the gap S is formed.

  In addition, the effect by such an expansion / contraction part 6A is not only the case where the position shifts in the length direction of the box culvert 2 that moves forward and backward (the expansion / contraction direction of the sheet member 6), but also the shear direction (also referred to as the radial direction) that is substantially orthogonal thereto. This is also effective when the position is shifted to ().

Next, another embodiment of the sheet member will be described.
FIG. 7 is an enlarged partial sectional view showing another embodiment of the sheet member. In FIG. 7, only one end of the sheet member in the width direction is shown, but the other end has the same configuration.
The sheet member 6 shown in FIG. 7 is different from the above-described sheet member 6 in that sandwiching portions 6B each having a U-shaped cross section are formed at both ends of the sheet member 6 in the width direction.

The outer width dimension Wa of the sandwiching portion 6B is formed to be substantially the same as the width dimension W2 of the concave groove 4. Further, the inner width dimension Wb between the inner walls 6a, 6a in the sandwiching portion 6B is formed to be narrower than the outer dimension dimension φ of the fixing member 8 (φ> Wb). For example, as shown in FIG. 6, such sandwiching portions 6 </ b> B are provided at both ends in the width direction of the stretchable portion 6 </ b> A.
In this case, the U-shaped reinforcing member 9 having a U-shaped cross section may be installed in the recessed groove 4, and in this case, the width dimension between both walls of the reinforcing member 9 is set to W2.

  In this embodiment, at the time of construction, the clamping portion 6B can be easily inserted into the groove 4 and can be temporarily fixed to the extent that the sheet member 6 does not fall off, so that the workability is improved. That is, the tubular embedded object 1 can be manufactured in a short time. Further, when the sheet member 6 is installed and fixed by the fixing member 8, there is no protrusion at both ends of the sheet member 6, so that the flow-down function is not hindered. Then, the fixing member 8 having an outer dimension φ larger than the inner width dimension Wb in the sandwiching portion 6B is narrowly inserted into the groove 4 to generate a strong pressing force from both width directions, thereby generating the sheet member 6. Can be firmly fixed. Thereby, it can be set as the tubular buried object 1 which has high water-tightness and earthquake resistance.

Furthermore, in order to protect the sheet member 6 from abrasion and damage, it is desirable that a protective cover 10 as described below is attached to the inner wall surface of the tubular embedded object 1.
FIG. 8 is a sectional view showing a part of a tubular embedded object as a first embodiment provided with a protective cover, FIG. 9 is a sectional view showing a part of a tubular embedded object as a second embodiment provided with a protective cover, and FIG. FIG. 11 is a cross-sectional view showing a part of a tubular embedded object as a third embodiment provided with a protective cover, FIG. 11 is a perspective view showing a partial configuration of the protective cover of the third embodiment, and FIG. 12 is a protection of the third embodiment. FIG. 13 is a cross-sectional view showing a part of a tubular embedded object as Example 4, in which a cover is provided in a box culvert as a tubular embedded object. 8, FIG. 10 and FIG. 13 show an example in which a seam portion is formed between tubular embedded objects, and FIG. 9 shows an example in which a weak portion for inducing cracks is formed on the wall surface of the tubular embedded object.

  The protective cover 10 shown in FIGS. 8 to 11 protects the sheet member 6 from abrasion, damage, and the like, and when the seam portion of the tubular embedded object opens due to earthquake motion or the like, and pressure such as earth or sand acts on the sheet member 6. In addition, the sheet member 6 is prevented from expanding due to pressure and protruding to the inside of the tubular embedded object.

  In the first and second embodiments of FIGS. 8 and 9, the protective cover 10 mainly covers a pair of end covers 11 and 11 that cover both ends of the sheet member 6 in the expansion and contraction direction, and the center of the sheet member 6. It consists of a central cover 12.

  In the first embodiment shown in FIG. 8, a pair of end covers 11, 11 are provided on both sides of the joint portion J. One end cover 11 is fixed to the lower wall surface 2b, which is the inner wall of one tubular embedded object 1, in a state of covering one end of the sheet member 6, and similarly, the other end cover 11 It is being fixed to the lower wall surface 2b which is an inner wall of the tubular buried thing 1 in the state which covers the other edge part of the sheet | seat member 6. FIG.

  The end cover 11 includes a base portion 11a and a cover portion 11b that is formed in a cross-sectional crank shape (or step shape) from the base portion 11a and extends toward the joint portion J. The base portion 11 a is attached to the lower wall surface 2 b which is the inner wall surface of the tubular embedded object 1 via a fixing bolt 16, and the cover portion 11 b covers one end portion of the sheet member 6. The step portion of the base portion 11a is disposed so as to face the concave groove 4, and functions as a dropout prevention member 15 that prevents the fixing member 8 such as the steel pipe 8b from coming out of the concave groove 4. Moreover, the guide protrusion 13 which protrudes in the lower surface 2b side which is an inner wall surface is formed in the lower surface of the cover part 11b, respectively. The guide protrusions 13 are provided at least at both ends of the cover portion 11b in the front-rear direction (direction orthogonal to the paper surface).

  On the other hand, the central cover 12 shown in the first embodiment is a flat plate member, and at both ends in the front-rear direction, guide long holes 14 whose longitudinal direction is the direction in which the sheet member 6 expands and contracts are formed. A protrusion 13 is inserted into the guide slot 14. Note that such guide long holes 14 are provided at positions facing the guide protrusions 13, that is, at both ends in at least the front-rear direction (direction orthogonal to the paper surface) orthogonal to the longitudinal direction.

  The central cover 12 is disposed between the cover portions 11 b and 11 b of the pair of end covers 11 and the sheet member 6, and the end covers 11 and 11 at both ends include guide protrusions 13 and guide long holes 14. By being guided by the guide mechanism, it is in a state in which it can slide relative to the central cover 12 along the longitudinal direction (the direction in which the sheet member 6 extends and contracts).

  The second embodiment shown in FIG. 9 is configured such that the center cover 12 is provided on the upper side of the cover portions 11b, 11b of the pair of end cover 11 (inside the inner center of the box culvert 2), the guide protrusion. 13 differs from the first embodiment in that 13 is provided on the center cover 12 side and the guide slot 14 is provided on the end cover 11 side, but the overall basic configuration is the same as that of the first embodiment of FIG. It is.

  In the first and second embodiments shown in FIG. 8 and FIG. 9, a crack is generated in the fragile portion 3 that induces cracks by opening the joint portion J between adjacent tubular embedded objects 1 due to seismic motion or the like. Thereby, the sheet | seat member 6 is extended by forming a clearance gap in the joint part J or the weak part 3. FIG. At the same time, since the guide protrusion 13 moves in the guide long hole 14, the opposing distance between the one end cover 11 and the other end cover 11 is increased following the extension of the sheet member 6.

Therefore, even when pressure such as earth or sand or water directly acts on the sheet member 6 through the gap, it is possible to prevent the sheet member 6 from projecting greatly inside the tubular embedded object 1. Therefore, the deterioration of the flow function can be reduced.
The guide protrusion 13 and the guide slot 14 may be configured such that one is provided in the cover portion 11b on the end cover 11 side and the other is provided in the center cover 12.

  As shown in FIGS. 10 to 13, the protective cover 10 shown in the third and fourth embodiments is a combination of a plurality of first members 10 </ b> A and second members 10 </ b> B formed of a flat metal plate (for example, stainless steel). It is constituted by. The first member 10A and the second member 10B are members provided with tapered portions 10b and 10b formed by bending both ends of the flat plate portion 10a in the width direction (the same direction as the expansion and contraction direction) into obtuse angles. In particular, the second member 10B is bent at an obtuse angle (approximately 135 degrees in FIG. 11) at two positions in the longitudinal direction of the flat plate portion 10a so that the flat plate portions 10a and 10a on both sides in the longitudinal direction are orthogonal to each other. It is the member formed in.

As shown in FIG. 12, the first member 10A is disposed opposite to four inner wall surfaces composed of an upper wall surface 2a, a lower wall surface 2b, a left wall surface 2c, and a right wall surface 2d, and the second member 10B is connected to these four inner wall surfaces. The protective cover 10 is circumferentially installed along the inner wall surface of the tubular embedded object 1 by being provided to face the four inclined surfaces 2e that are adjacent corner portions.
For example, as shown in FIG. 13, the protective cover 10 installed in this way can be attached by a holding member 17 and a fixing bolt 18 having a function of pressing both ends in the longitudinal direction of the protective cover 10. Such holding members 17 may be attached circumferentially along both ends of the protective cover 10 aligned in the circumferential direction, or at an arbitrary position on both ends of the protective cover 10 with an interval in the circumferential direction. A plurality may be attached.

  As shown in FIGS. 10 and 13, since the sheet member 6 is covered with the protective cover 10 in the third and fourth embodiments, the sheet member 6 does not protrude from the water surface. Moreover, since the taper portions 10b and 10b of the first member 10A and the second member 10B are arranged on the upstream side and the downstream side of the flowing water, it is possible to suppress a decrease in the flowing-down function.

  The protective cover 10 shown in the third and fourth embodiments is not limited to a flat surface such as the lower wall surface 2b of the box culvert 2, and is formed by forming the second member 10B in a shape that follows the inner wall surface. For example, it can also be used for the tubular embedded object 1 having a cylindrical or horseshoe-shaped inner wall surface.

  As shown in FIG. 9, also in the third embodiment, in order to prevent the sheet member 6 from falling off more reliably, the dropping prevention member 15 and a fixing bolt 16 for fixing the same at a position facing the concave groove 4 are provided. It is preferable to have a configuration in which In addition, in consideration of the shape or size of the tubular embedded object 1, any number of dropout prevention members 15 can be attached at any position. As shown in the fourth embodiment of FIG. 13, a spacer 19 may be inserted in the gap between the fixing member 8 and the protective cover 10 to prevent the fixing member 8 from falling off.

  As mentioned above, although the structure of this invention and its effect were demonstrated along the Example, embodiment of this invention is not limited to the said Example.

  For example, in the above-described embodiment, seismic resistance and water tightness are provided to the brittle part or the joint part of the pipe already embedded in the ground and formed to induce cracks in the wall of the pipe during an earthquake or the like. Although the tubular embedment to be provided and the manufacturing method thereof have been described, the present invention is not limited to this, and is also effective for a tubular embedment to be embedded.

  That is, by forming a plurality of concave grooves 4 at predetermined intervals along the length direction in advance on the inner wall surface of the tubular embedded object 1 before being embedded, or the rear end portion and the front end of the tubular embedded object 1 Between the pair of concave grooves 4 (4a, 4b) provided in advance with respect to a place corresponding to a sudden change part of the ground or the joint part J of the pipe rod when the tubular buried object 1 is buried. The sheet member 6 may be disposed on the base plate and held and fixed by the fixing members 8 and 8 as described above. In this case, the concave grooves 4 can be formed at the same time when the tubular buried object 1 is built by pouring concrete into the mold. At the same time, it is also possible to embed a U-shaped reinforcing member 9 in each concave groove 4.

  Moreover, in the said embodiment, although the structure which attached the sheet | seat member 6 to the inner wall surface of the tubular buried thing 1 was shown and demonstrated, this invention is not restricted to this, What is the tubular buried thing 1 before being buried? For example, the sheet member 6 may be attached to the outer wall surface of the tubular embedded object 1. In this case, it goes without saying that the first to third steps described above are performed on the outer wall surface of the tubular embedded object 1.

  In the configuration in which the sheet member 6 is attached to the outer wall surface of the tubular embedded object 1, since the sheet member 6, the protective cover 10, and the like are not exposed in the tubular embedded object 1 on the inner surface side, compared with the case where the sheet member 6 is attached on the inner side, the flow down function is deteriorated. Can be prevented.

  The tubular buried object of the present invention can be used in a wider range of applications in the field of concrete box culverts and cylindrical pipes that constitute underground sewers, rainwater drainage, electricity / communications, underground passages, etc. Can be planned.

DESCRIPTION OF SYMBOLS 1; Tubular embedded object 2; Box culvert 2A; Front-end | tip part 2B; Rear-end part 2a; Upper wall surface 2b; Lower wall surface 2c; Left wall surface 2d; 4a; one concave groove 4b; the other concave groove 6; sheet member 6A; expansion and contraction part 6B; clamping part 6a; inner wall 8 of the clamping part; fixing member 8a; round steel 8b; 10A; 1st member 10B; 2nd member 10a; Flat plate part 10b; Tapered part 11; End cover 11a; Base part 11b; Cover part 12;
13; guide projection 14; guide slot 15; drop-off prevention member 16; fixing bolt 17; holding member 18; fixing bolt J; joint 19;

Claims (15)

In the tubular embedment (1) in which the joint (J) between the tubular embedments (1) arranged in the front-rear direction or the fragile part (3) that induces cracks on the wall surface is formed,
A pair of concave grooves (4) circumferentially recessed along the inner wall surface at positions on both sides of the tubular embedded object (1) and sandwiching the joint (J) or the fragile portion (3) ) And one groove (4a) and the other groove (4b), and a sheet member (6) formed in an annular shape covering the joint (J) or the fragile portion (3) ) And a round steel (8a) formed into a plurality of divided linear or arcuate shapes that are sandwiched together with the sheet member (6) in the concave groove (4) and hold and fix the sheet member (6 ) Or a fixing member (8) made of a steel pipe (8b) ,
The tubular embedded object, wherein the plurality of fixing members (8) are inserted into the concave groove (4) and arranged circumferentially. The tubular embedded article according to claim 1, wherein a sandwiching portion (6B) having a U-shaped cross section is formed at both ends in the width direction of the sheet member (6).   The tubular embedded article according to claim 1 or 2, wherein the sheet member (6) is provided with a bellows-like stretchable part (6A).   The tubular embedded article according to any one of claims 1 to 3, wherein a reinforcing member (9) having a U-shaped cross section is provided in the pair of concave grooves (4). The tubular embedded object according to any one of claims 1 to 4, wherein the steel pipe (8b) has an elliptical cross section. The outer dimension φ of the fixing member (8) when the sheet thickness dimension of the sheet member (6) is t, the width dimension of the groove (4) is W2, and the depth dimension of the groove (4) is H is W2. The tubular embedded object according to any one of claims 1 to 5 , which is set in a range of>φ> W2-2 × t and φ ≦ H-t. The tubular embedded object according to any one of claims 1 to 6 , wherein the pair of concave grooves (4), the sheet member (6), and the fixing member (8) are provided on the inner wall surface of the tubular embedded object (1). The tubular embedment according to any one of claims 1 to 7, further comprising a protective cover (10) that covers the sheet member (6). A protective cover (10) is fixed to the tubular embedded object (1) side and covers a pair of end covers (11) respectively covering both ends of the sheet member (6), and a sheet member (6) excluding the both ends. The tubular embedded article according to claim 8 , comprising a central cover (12) that covers the central part and is slidably attached to the end cover (11). A position facing the groove (4), wherein the fixing member (8) is any one of claims 1 to 9 provided with the stopper member (15) to prevent the coming off from the groove (4) Tubular buried object. The tubular embedded article according to claim 9, wherein a part of the end cover (11) is opposed to the concave groove (4) to form a drop-off preventing member (15). In the manufacturing method of the tubular buried object according to any one of claims 1 to 11 ,
A first step of forming a pair of concave grooves (4) on both sides of the wall of the tubular embedded object (1) and sandwiching the joint portion (J) or the fragile portion (3); A second step in which a sheet member (6) is disposed between the groove (4a) and the other concave groove (4b) to cover the joint (J) or the fragile portion (3); A fixing member (8) made of round steel (8a) or steel pipe (8b) formed in a linear or arc shape is inserted into each of the pair of concave grooves (4a, 4b) together with the sheet member (6). And a third step of fixing the sheet member (6). Claim having a first after step, the step of providing the reinforcing member (9) comprising a shape of the inner surface in cross-section U of the pair of concave grooves (4) recessing the pair of concave grooves (4), respectively 12 The manufacturing method of the tubular buried thing of description. The cross-sectional circular hollow fixing member (8) after the third step of inserting into the groove (4), according to claim 12 or 13, wherein comprising the step of crushing said fixing member (8) in a substantially elliptical shape Manufacturing method for tubular embedded objects. The method for manufacturing a tubular embedded object according to any one of claims 12 to 15 , wherein the first to third steps are performed on the inner wall surface of the tubular embedded object (1).

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