JP3901691B2 - Tube fixing structure and tube fixing method - Google Patents

Description

  The present invention relates to a pipe fixing structure and a pipe fixing method used when piping is performed as a secondary lining in a shield or an existing pipe rod.

  Conventionally, when a pipe is newly constructed as a secondary lining in a shield or an existing pipeline, first, the pipeline that forms the secondary lining is fixed at a predetermined position in the existing pipeline (primary lining) The gap between the newly installed inner pipe outer surface and the existing inner pipe is filled and injected with mortar or other interstitial material to integrate the two pipes. In order to prevent the inner intubation passage from floating due to buoyancy or moving due to the injection pressure during the injection of the insert material, a support member is inserted into the gap before the injection to support it. Both pipes are fixed via members.

For example, as shown in FIG. 5, a steel band B having substantially the same curvature is applied to the outer periphery of the inner intubation channel 2, and the support material C made of wood is placed between the steel band B and the existing channel 1. 1 and 2 are arranged in a radial direction, and a U-shaped squirrel A having a U-shape is driven between the support material C and the inner surface of the band B so that the inner intubation channel 2 is made into the existing channel 1. It fixes so that the internal intubation path 2 may not move with respect to the existing duct 1 (for example, refer patent document 1).
Moreover, the technique using what solidified the resin foam with the cement to the said support material C and the raw material of an inside-in material is also disclosed (for example, refer patent document 2).
Utility Model Registration No. 2520808 JP-A-10-148096

  However, according to the tube fixing structure using the support member described in FIG. 5 (Patent Document 1), when buoyancy due to mortar injection or other external force acts on the pipelines 1 and 2, the pipeline 1 2 slightly moves and the wedge D sandwiched between the squirts A loosens and the support material C may come off. If the supporting material C is detached, the pipe line 2 is more likely to float, and the pipe shaft center may be bent in the vertical and horizontal directions at the joint portion of the pipe line 2 and the like. Further, according to the structure shown in FIG. 5, since the two wedges D and D are driven to face each other as shown in the figure, the two wedges D and D overlap with each other in the circumferential direction of the pipe line. The thickness in the radial direction of the pipe line 2 in a state where the wedges D and D are overlapped varies depending on the degree (the length in which the wedges D overlap with each other along the direction in which the wedge D is driven). For this reason, the width of the gap 4 between the pipe lines 1 and 2 may vary over the entire circumference of the pipe line 2 due to the strength of the driven state of the wedge D.

  In addition, since the support material C is made of wood, and its compression elastic modulus is relatively higher than that of the mortar, when an external force acts on the entire ground or the pipeline, the mortar portion is appropriately elastically deformed, While the inner intubation channel 2 is intended to be supported on the existing channel 1 with a large area and with a uniform stress, the support material C is not elastically deformed so much and through the contact portion to the channels 1 and 2. The external force is applied to both pipes 1 and 2 locally. For this reason, the use of the support material C made of wood is not preferable because it may cause damage to the pipeline. Further, the fact that the end face of the squirrel A is in direct contact with the outer peripheral surface of the inner intubation passage 2 also causes stress concentration on the passage 2.

  Furthermore, since the support material C is made of wood, when the wood is corroded after the mortar is cured, the portion where the support material C exists becomes a void interposed in the mortar. The void inside the mortar is not preferable because it causes uneven stress on the pipe.

  In addition, today, when a new pipe is installed in the existing pipe line 1 as described above, there is a request to secure the flow rate by increasing the inner diameter of the new pipe as much as possible. A pipe fixing structure that can cope with a case where the gap 4 between the outer surface of the intubation path 2 and the inner surface of the existing pipe 1 is small is required. In the structure described in Patent Document 2, a certain gap width is required to insert the support member, and thus such a request cannot be met.

  Further, in the structure described in Patent Document 2, since the resin foam is mixed with cement for use in the intermediate material and the support member, the specific gravity is light and the strength may be insufficient. When the strength is insufficient, particularly, the support member positioned at the upper portion is compressed and broken by the buoyancy acting on the pipeline when the intermediate material is injected, and the two pipelines cannot be fixed to each other. For this reason, since the position shift of the intubation path occurs, it is not preferable. On the other hand, if the elastic modulus becomes too large to increase the compressive strength of the support member in order to counter the buoyancy, when an external force is applied, only the place where the support member is interposed is constrained, and the local intubation path is localized. In other words, there is a problem that an excessive displacement difference or uneven stress is generated.

  Therefore, the present invention makes it difficult to generate excessive stress or locally biased stress in the pipe line, prevents movement of the internal intubation line, and even when the gap between the existing pipe line and the internal intubation line is small. It is an object to be able to fix both pipes.

  In order to solve the above-mentioned problem, the present invention inserts a support member made of the same material as the insert material into the gap between the outer conduit and the inner conduit, and inserts the support member and the insert later. Are integrated to support both pipes, and the support member is plate-shaped to provide a spacer function to fill the gap. Since the supporting member and the insert material are the same material, both pipes are supported with a uniform force over the entire circumference, and the supporting member is plate-like, so that the necessary number of sheets can be inserted.

  Specifically, when the inner intubation path is configured as a secondary lining in the duct, a support member is interposed in the gap between the inner circumferential surface of the duct and the outer circumferential surface of the inner intubation path, and the support In the pipe fixing structure in which the inner insertion pipe is fixed to the inside of the pipe via a member and the intermediate material is injected into the gap, the support member behaves integrally with the intermediate material, and the both pipes are connected to each other. It consists of a tube fixing plate that is supported with equal force along with the intermediate material over its entire length and circumference, and the tube fixing plate is arranged over the entire circumference of the gap. In accordance with the gap width, it can be inserted in the radial direction of the pipe.

  In this way, in fixing by pressing both pipes with the support member, the degree of press contact can be adjusted by inserting the required number of pipe fixing plates in accordance with the gap width between the two pipe lines, so the gap width is large. Even in this case, it is possible to appropriately cope with the gap width by using the pipe fixing plate in the radial direction of the pipe. Further, since the support member is made flat by adopting the tube fixing plate, the thickness does not change depending on the degree of superposition like a wedge. For this reason, the bias of the pipe line due to the strength of the insertion degree of the support member can be prevented. Furthermore, since the support member is plate-shaped, it is easy to set variations in thickness, and even when the gap is small, it can be easily handled by using a thin tube fixing plate that matches the gap width.

  As a method for forming the above-described tube fixing structure, an inner intubation path is inserted inside the duct, and the inner intubation path has an insertion port at one end thereof as a receiving port of another adjacent channel. While fitting, on the outer periphery of the other end of the other pipe line inserted, the pipe fixing plate is inserted so as to fill the gaps between the respective arrangement places, and the inner pipe line is fixed inside the pipe line, Thereafter, the interstitial material is injected into the gap. Since the insertion place of the tube fixing plate is the outer periphery of the receiving port of the inner tube, the tube fixing plate can be easily inserted by being always located at the start side end of the inner tube to be appropriately connected and arranged.

  In order to cause the support member to behave integrally with the insert material and to support the both pipe lines with the insert material over the entire length and the entire circumference with an equal force, the pipe fixing as the support member is performed. The plate and the intermediate material may be made of a material having the same or a similar elastic modulus, and as much as possible, it is desirable that the material has the same or a similar compressive strength. In this way, a force equal to the entire circumference and the entire length acts on both pipes without a bias against a predetermined external force, and both pipes are supported by supporting both pipes with the same force. The same behavior is also obtained over the entire circumference and the entire length, and the amount of displacement can be made uniform. At this time, by adopting the flat pipe fixing plate, it is possible to prevent the deviation between the two pipe lines, so that the thickness of the intermediate material and the pipe fixing plate in the gap can be made close to a constant one. For this reason, the force which acts on both the pipe lines can be made more uniform, and the integrity can be further improved.

  In the present invention, as described above, since the support member is formed in a plate shape, the thickness thereof can be adjusted according to the size of the gap width, and the tube fixing plate and the insert member are integrally acted to Since the intubation line and the existing pipe line are supported by the entire length and the entire circumference, it is difficult to generate a shift and stress concentration in the pipe line.

  An embodiment is shown in FIGS. 1 to 4, and the pipe fixing structure of this embodiment is, for example, as a secondary lining in an existing pipeline 1 such as a water and sewer pipe or various tunnels, as shown in FIG. In order to newly install and fix the pipe 2, a pipe using a support member composed of a pipe fixing plate 3 inserted into the gap between the outer peripheral surface 12 of the new pipe 2 and the inner peripheral surface 11 of the existing pipe 1. It is a fixed structure. After fixing both the pipe lines 1 and 2 through this support member, air mortar or the like is injected into the gap 4 as the interposing material 5 so that the both pipe lines 1 and 2 are integrated.

  The pipe line 1 is composed of a tube body having a horseshoe shape in cross section shown in FIG. 2B, and is continuously provided so as to be buried in the ground and connect predetermined points. The inner intubation path 2 installed in the existing duct 1 is formed of a tubular body having a slightly smaller diameter than that of the duct 1 and having a cross-section horseshoe shape, one end side of which is an insertion port 2a and the other end side is a receiving port 2b. It is said. The receiving port 2b is slightly enlarged in diameter as shown in FIG. 4 so that the insertion port 2a of another inner intubation channel 2 can be fitted therein. By inserting the insertion port 2a of another inner insertion channel 2 into the receiving port 2b, as shown by a chain line in FIG. 4, both the pipelines 2 and 2 are in close contact with each other, and as shown in FIG. Furthermore, another pipe line 2 is connected one after another in the length direction.

  In the gap 4 between the outer peripheral surface 12a of the receiving port 2b and the inner peripheral surface 11 of the existing pipe line 1, as a support member, a urethane foam having a compressive strength equivalent to that of the insert 5 to be injected later and an equivalent elastic coefficient. A tube fixing plate 3 made of a material is arranged at an appropriate interval as shown in FIG. 1 over the entire circumference of the gap 4, and the pipe fixing plate 3 has a width 4 (thickness in the pipe radial direction) at each arrangement position. In accordance with (a), the pipes 1 and 2 are inserted in the pipe radial direction. For this reason, the pipe fixing plate 3 is in close contact with the outer peripheral surface 12a and the inner peripheral surface 11 with no gap in the gap 4, and fixes both the pipes 1 and 2 so as not to move easily. That is, one end side of the inner intubation path 2 is inserted into and fixed to the receiving port 2b of another adjacent inner intubation path 2, and the other end side of the inner intubation path 2 is fixed to the receiving port 2b. It is being fixed to the existing pipe line 1 via.

  In the state where the tube fixing plate 3 is inserted into the gap 4, the interstitial material 5 is injected and interposed so as to fill the gap 4, so that both the pipe lines 1 and 2 are connected to the tube fixing plate 3. It can be supported over the entire length of the entire circumference via the (supporting member) and the insert 5.

  At this time, since the tube fixing plate 3 and the insert material 5 are materials having the same strength and the same elastic modulus, the tube fixing plate 3 and the insert material 5 are integrated when an external force is applied to the entire pipe line. Thus, both the ducts 1 and 2 can be supported with uniform force over the entire peripheral surface. For example, as shown by a broken line to a solid line in FIG. 3, if the displacement S occurs due to movement of the internal insertion pipe 2 relative to the existing pipe 1 at a location where the pipe fixing plate 3 is interposed, Since the compressive elastic modulus is the same even in the non-intervening place, the displacement S can be the same as the place shown in FIG. 3 as long as the conditions such as the external force that acts are the same. For this reason, excessive stress is not generated locally in the pipes 1 and 2 or discontinuous stress is not generated.

  The tube fixing plate 3 is preferably a tube fixing plate 3 produced by curing the injecting material 5 itself to be injected, since the compressive strength and the elastic modulus of elasticity are completely equal, but as long as the above functions are not hindered. In this case, the tube fixing plate 3 may be a material having an equivalent degree in a range approximating the compressive strength and the compressive elastic modulus of the insert 5. The fact that the tube fixing plate 3 and the interstitial material 5 have the same compressive strength and the same elastic modulus means that the compressive strength and the compressive elastic modulus are substantially within the range in which both behaviors can act equally as described above. A material within the same range.

  The fixing method of both the pipe lines 1 and 2 for forming this pipe fixing structure will be described. The inner insertion pipe line 2 to be secondary-covered at a predetermined position in the existing pipe line 1 and its receiving port 2b on the start side. In this state, it is inserted by a known method in the direction of the arrow shown in FIG. The inserted inner intubation channel 2 is fitted with the insertion port 2a at one end thereof into the receiving port 2b of another inner intubation channel 2 already fixed in the same existing channel 1, and the inserted inner intubation channel 2 A plurality of the tube fixing plates 3 are inserted into the outer periphery of the receiving port 2b at the other end until the thickness of the tube fixing plate 3 is filled to fill the gap 4, and the inner tube 2 is inserted inside the existing tube 1. Fix so that it does not move. The arrangement locations may be inserted at appropriate intervals at the upper, lower and side locations of the receiving port 2b, but in order to support them evenly and reduce the deviation of the pipelines, It is desirable to arrange them symmetrically across the axis.

  After the insertion, connection, and fixing by the tube fixing plate 3 are repeated, the inner intubation channel 2 is continuously connected in the length direction for a predetermined distance, and then the existing duct 1 and the secondary lining are connected. The air mortar is injected into the gap 4 between the inner intubation path 2 and the inner intubation path 2 is integrated and fixed to the existing duct 1.

  In addition, when the gap | interval 4 width | variety of the existing pipe line 1 and the internal insertion pipe line 2 is larger than the thickness of the pipe fixing board 3, you may use the pipe fixing board 3 in piles suitably. On the other hand, when it is desired to use the tube fixing plate 3 at a location where the width of the gap 4 is small, it can be dealt with by preparing a thin one that can be inserted into the gap 4. Furthermore, if necessary, tube fixing plates 3 having different thicknesses may be used in combination. If the tube fixing plates 3 having different thicknesses are used in combination, for example, when the tube fixing plate 3 having a thickness in the gap 4 having a predetermined width is inserted, the tube fixing plate 3 and both pipes 1 and 2 If there is still a slight gap between the two pipes 1 and 2, the thin pipe fixing plate 3 corresponding to the small gap is inserted, and the degree of pressure contact between the two pipe lines 1 and 2 fixed via the pipe fixing plate 3 is increased. Can be increased.

  When the tube fixing plate 3 is used as described above, the tube fixing plate 3 located above the inner intubation channel 2 prevents the inner intubation channel 2 from rising due to buoyancy during the air mortar injection. Acts as a buoyancy prevention material. The experimental results of the performance as the buoyancy prevention material are shown in Table 1 below.

As shown in Table 1, when air milk is used as the insert 5 and a horseshoe-shaped tube 4m of 2r = 1650 is used, the anti-floating material (tube fixing plate 3) is made of urethane foam and compressed. The elastic modulus is 1750 N / mm ² . Under this condition, when the interstitial material 5 is injected, the displacement S of the tube due to the buoyancy generated in the inner intubation passage 2 is 0.025 mm as shown in the table. Although this value is slightly larger than the value 0.006 mm of the displacement S when the same anti-lifting material made of wood (compression elastic modulus 8000 N / mm ² ) is used, the displacement is slightly larger. It can be seen that this is an effective value as a buoyancy prevention material.

  As described above, by using a urethane foam material having a small compression elastic modulus as the tube fixing plate 3, the tube fixing plate 3 can be compressed with respect to external force more than when wood is used. Thus, the degree of compression is equivalent to that of the intermediate material 5 after curing. By equalizing the degree of compression, both of them behave integrally, and the difference in local displacement of the inner intubation path 2 that occurs when using a support member made of wood, that is, the inner intubation path 2 This eliminates the difference between the amount of displacement at the portion in contact with the tube fixing plate 3 and the amount of variation at the portion in direct contact with the insert 5.

  On the other hand, the tube fixing plate 3 has elasticity that behaves integrally with the insert material 5 as described above, and has a strength that can withstand buoyancy during injection of the insert material 5 without being destroyed as shown in Table 1. Since it has, the intubation path 2 does not move. The amount of displacement of the intubation passage 2 due to the buoyancy, that is, the amount of compression of the tube fixing plate 3 is as small as 0.025 mm, and the urethane foam as the material of the tube fixing plate 3 is as described above. It can be said that it has moderate elasticity that does not cause displacement of the pipeline.

  For this reason, according to the said raw material, it turns out that the damage of the pipe line by the intubation pipe line 2 moving large carelessly within the existing pipe line 1 can also be prevented. In addition, the pipe fixing plate 3 and the interposing member 5 behave in an integrated manner even when the inner intubation path 2 moves in the existing duct 1 so as to slightly float as described above. Since the whole of the pipe line 2 in the axial direction follows and floats, local deformation of the pipe line 2 and bending at the connecting part can be prevented.

The stress acting on the buoyancy prevention material is 1.1 N / mm ² in the above experimental results, and the strength required for the material is, for example, when the safety factor is 2 in this case. 2.2 N / mm ² is sufficient.

  In this embodiment, the horseshoe-shaped pipes 1 and 2 are used. However, the present invention is not limited to this embodiment, and the cross-sectional shape of the pipe is arbitrary. For example, a circular pipe line or a box pipe such as a quadrilateral can be expected. In addition, the material of the insert 5 has a certain elastic coefficient as long as the inner insertion pipe 2 can be supported by the elastic force in the existing pipe 1 like the air mortar of this embodiment, and the elastic force is Although it is desirable that the amount does not cause an excessive amount of displacement, the material is not particularly limited to this air mortar, and in addition to air milk, foamable materials such as foamed urethane can also be used. In particular, it is more preferable if the expansion ratio can be adjusted as appropriate, such as urethane foam.

  Furthermore, the arrangement location and arrangement interval (position and interval with respect to the length direction of the tube body) of the tube fixing plate 3 are arbitrary, and may be provided at a location other than the receiving port 2b of the internal intubation channel 2, and the tube It is good also as a structure which makes it easy to insert in the gap | interval 4 by making the cross-sectional shape of the tube axis direction of the fixed plate 3 or a pipe | tube outer peripheral direction into a wedge shape.

Perspective view of one embodiment (A) is a plan view of the same embodiment, (b) is a sectional view Enlarged view of the main part of FIG. Enlarged view of the main part showing the insertion state of the tube fixing plate Cross section of conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing pipe 2 Inner intubation path 2a Inlet 2b Receiving port 3 Pipe fixing plate 4 Gap 5 Insertion material 11 Inner peripheral surface 12, 12a Outer peripheral surface

Claims (1)

When the inner intubation path 2 is constructed as a secondary lining in the duct 1, a support member is interposed in the gap 4 between the inner peripheral surface of the duct 1 and the outer peripheral surface of the inner intubation path 2. A pipe fixing method for forming a pipe fixing structure for fixing the inner insertion pipe 2 inside the pipe 1 via a member and injecting the interstitial material 5 into the gap 4 ,
The support member is composed of a tube fixing plate 3 made by curing the filling material 5 itself to be injected, and an inner intubation channel 2 is inserted into the inner side of the channel 1, and the inner intubation channel 2 is formed at one end thereof. The insertion port 2a is fitted into the receiving port 2b of another adjacent inner intubation channel 2, and the tube fixing plate 3 is placed on the outer periphery of the receiving port 2b at the other end around the gap 4 with the inner peripheral surface of the channel 1 The pipe fixing plate 3 is inserted in the radial direction of the pipes 1 and 2 in accordance with the width of the gap 4 at each arrangement place, and the inner insertion pipe 2 is fixed inside the pipe 1. Then, a tube fixing method in which the interstitial material 5 is injected into the gap 4.

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