JP4974540B2 - Lining board - Google Patents

Description

  The present invention relates to a lining board used for civil engineering construction work.

  The lining board used for civil engineering construction work is generally constructed by welding H-shaped steels in parallel and closing the peripheral surface with plate-like side plates. In such a lining board, a width of 1 m, a length of 2 m or 3 m is a practical standard size.

Such a lining board is required to withstand a total load weight of 25 tons by law. In order to ensure this strength, conventionally, a configuration in which a reinforcing material is welded to the bottom surface of the lining plate, a configuration using a reinforced side plate, and the like have been proposed (Patent Documents 1 and 2 below).
JP-A-8-41809 Japanese Utility Model Publication No. 7-340002

  By the way, if such a lining plate can be made long, it is possible to increase the span of the receiving girder that supports the lining plate, and to reduce the number of lining plates required for the laying area. Therefore, it is expected to improve the convenience of civil engineering construction.

  However, with the conventionally proposed configuration, it has been difficult to ensure sufficient strength when the lining plate is elongated.

  Further, if a large reinforcing material is used to ensure sufficient strength, the weight of the lining plate is increased, and there is a problem that a large heavy machine is required for its transportation and installation, and the workability is deteriorated.

  This invention is made | formed in view of the said situation, and it aims at providing the lining board which can ensure high intensity | strength, suppressing an increase in weight, and can be lengthened by extension.

  The present invention is solved by the following means.

  [1] In a lining plate in which a plurality of molds each having an upper flange, a lower flange, and a web are connected in parallel, a reinforcing material is added to the longitudinal center of the lower flange of the molds arranged on both outer sides. A lining board characterized by contact.

  [2] The lining plate according to item 1 above, wherein the steel plate is prestressed and applied by applying prestress to the reinforcing material.

  [3] The lining plate according to item 1 or 2, wherein the reinforcing material is attached to the upper surface side of the lower flange.

  [4] The lining plate according to any one of items 1 to 3, wherein the length of the reinforcing material is 8% to 61% of the total length of the mold material.

  [5] The lining plate according to any one of [1] to [4], wherein the thickness of the reinforcing material is not more than twice the thickness of the lower flange.

  According to the invention of [1], the largest load among the parts of the lining plate, that is, the central part in the longitudinal direction of the lower flange of the mold material arranged on both outsides among the mold materials connected in parallel. Since the reinforcing material is attached to the site where the material acts, high strength can be ensured while suppressing an increase in weight due to the reinforcing material. Thereby, it becomes possible to lengthen a lining board compared with the past. And, according to the elongated lining plate, it is possible to increase the span of the receiving girder that supports the lining plate, and it is possible to reduce the required number of lining plates for the laying area. Convenience in construction can be improved.

  According to the invention of [2], the steel plate prestress strengthening that attaches the prestressed reinforcing material to the longitudinal center portion of the lower flange of the mold material arranged on both outer sides is performed, so the strength of this part Is sufficiently increased, and high strength can be secured while suppressing an increase in weight due to the reinforcing material.

  According to the invention of [3], since the reinforcing material is attached to the upper surface side of the lower flange, the reinforcing material is arranged on the inner side of the mold material and does not protrude to the outer side of the mold material, and the outer dimensions of the lining plate are compact. Can be formed.

  According to the invention of [4], since the length of the reinforcing material is 8% to 61% of the total length of the mold material, high strength can be ensured while suppressing an increase in weight due to the reinforcing material.

  According to the invention of the preceding item [5], since the thickness of the reinforcing material is not more than twice the thickness of the lower flange, it is possible to ensure high strength while suppressing an increase in weight due to the reinforcing material.

  Hereinafter, the present invention will be described based on embodiments.

  FIG. 1 is a longitudinal sectional view of a lining plate according to an embodiment of the present invention. FIG. 2 is a partially cutaway plan view of the lining plate. FIG. 3 is a front view of the lining plate. FIG. 4 is an enlarged view showing an attachment portion of the reinforcing material in the lining plate.

  As shown in these drawings, the lining plate 1 according to this embodiment is configured by connecting a plurality of (in this example, five) mold members 10 in a parallel state. The mold 10 is made of a so-called H-shaped steel having an H-shaped cross section provided with an upper flange 11, a lower flange 12 and a web 13. Further, on the outer side surfaces of the upper and lower flanges 11 and 12 of the mold member 10, striped portions 14 formed of a plurality of stripe-like irregularities extending in the longitudinal direction are formed.

  The plurality of mold members 10 are connected by welding the upper and lower flanges 11 and 12 of adjacent mold members 10 over the entire length in the longitudinal direction.

  Side plates 40, 40, 50, 50 made of steel plates are welded around the plurality of mold members 10. Further, cushioning materials 15 and 15 made of rubber pads or the like are attached to the lower surfaces of both ends in the longitudinal direction, which are grounding portions when the lining plate 1 is laid.

  The lining board 1 of this embodiment is configured to be 1 m wide and 4 m long, which is longer than the conventional standard size. When the covering plate 1 is elongated in this way, when a load is applied to the covering plate 1 supported at both ends in the length direction, bending stress acting on each part increases.

  FIG. 5 is a graph showing a ratio of a load distributed to each mold material when a load is applied to the lining plate 1 according to this embodiment, that is, a load sharing ratio.

  This graph shows that each mold 10 has a length of 3992 mm, a width of 197 mm, a height of 196 mm, a thickness of the upper and lower flanges of 8 mm, a thickness of the web of 6 mm, a depth of welding of 4 mm for joining the molds 10, 40, 50, and 50 are obtained by performing a lattice analysis with a thickness of 3 mm.

  In the drawing, G1 to G5 represent mold materials 10 constituting the lining plate 1, respectively, G1 and G5 are both outer sides, G3 is the center, and G2 and G4 are mold materials 10 located between them.

  As shown in the figure, when loaded on G3 which is the central mold member 10, the load is distributed to each mold member 10 of G1 to G5, and even G3 having the maximum load sharing ratio is 0.212. On the other hand, when loaded on G1 which is the outer mold member 10, the load is biased toward G1, and the load sharing ratio is 0.312.

  From this, it can be seen that it is the mold material 10 arranged on both outer sides that is exposed to the largest load in such a lining plate 1.

  Therefore, in this embodiment, reinforcement is achieved by attaching plate-like reinforcing members 20 and 20 to the longitudinal center portions of the lower flanges 12 and 12 of the mold members 10 and 10 disposed on both outer sides. .

  In this embodiment, the reinforcing materials 20 and 20 are in contact with the upper surfaces of the lower flanges 12 and 12. Specifically, the lower flanges 12 and 12 of the mold members 10 and 10 arranged on both outer sides are in contact with the outer portions of the webs 13 and 13. As a result, the reinforcing members 20 are arranged on the inner side of the mold member 10 and do not protrude outside the mold member 10. Therefore, the outer dimension of the lining board 1 can be formed compactly.

  Moreover, in this embodiment, the steel plate prestress reinforcement | strengthening which gives the prestress to the reinforcing material 20 and employs it as a reinforcement | strengthening method by the reinforcing materials 20 and 20 is employ | adopted.

  In this steel plate prestress strengthening, the reinforcing members 20, 20 are made of a high-tensile steel plate. Then, after one end of each of the reinforcing members 20 and 20 is coupled to a position closer to one side than the longitudinal center of the lower flanges 12 and 12 which are reinforcement target portions, the reinforcing members 20 and 20 are thermally expanded by, for example, a burner or the like. Then, the other end is coupled to the opposite side of the coupling position on the one end side across the longitudinal center of the lower flanges 12 and 12.

  In this embodiment, three high-strength bolts (high tension bolts) are used on both sides of the reinforcing members 20 and 20 as means for connecting the reinforcing members 20 and 20 to the lower flanges 12 and 12, respectively. By using such high-strength bolts, the connecting portions of the reinforcing members 20 and 20 with respect to the lower flanges 12 and 12 are prevented from being displaced due to play of the bolt holes or the like.

  If steel plate prestress reinforcement is performed in this way, compressive stress remains in the longitudinal center portions of the lower flanges 12 and 12 that are reinforcement target portions due to prestress given in advance to the reinforcing members 20 and 20, and the lining plate 1 and the tensile stress due to the load acting on the lining plate 1 are offset, so that the lower flanges 12 and 12 can be reinforced.

  The thickness of the reinforcing members 20 and 20 is preferably 2 times or less, more preferably 1.5 times or less the thickness of the lower flanges 12 and 12 from the viewpoint of suppressing an increase in weight. In particular, it is desirable that the thickness be equal to or less than that of the lower flanges 12 and 12 from the viewpoint that they can be integrally attached to the lower flanges 12 and 12.

  FIG. 6 is a graph showing tensile stress acting on each part in the longitudinal direction in the lower flange 12 of the mold member 10 arranged on the outermost side of the lining plate 1 according to this embodiment.

  In the figure, when the outer mold material 10 obtained in the above is assumed to have a load sharing ratio of 0.312 and the load sharing ratio is assumed to be 0.4, a load of 25 tons required by the law is applied to the outer mold material 10. The tensile stress of each part when acting is shown. The load sharing ratio of 0.4 is a value assumed on the safest side.

Assuming that the allowable stress value set based on the material characteristics of the lower flanges 12 and 18 is 185.0 N / mm ² , the allowable stress value is set to the 320 mm portion in the central portion in the longitudinal direction when the load sharing ratio is 0.312. Excessive stress is acting. In addition, when the load sharing ratio is 0.4, a stress exceeding the allowable stress value is applied to the 2040 mm portion in the central portion in the longitudinal direction (values are rounded up to 10 mm, and the following numerical values are also the same). .

  In such a case, the range to be reinforced by the reinforcing material 20, that is, the length of the reinforcing material 20, is the longitudinal center where the acting tensile stress exceeds the allowable stress value even when the load sharing ratio is 0.312. It is necessary that it is 8% (0.08) or more as a ratio with respect to the total length (4000 mm) of the mold material 10.

  Further, in order to surely reinforce the portion exceeding the allowable stress value, it is possible to set a range obtained by adding a length corresponding to the height (200 mm) of the mold material 10 on both sides of the portion. desirable. That is, it is desirable that the length of the reinforcing material 20 is 720 mm or more, and the ratio to the total length of the mold material 10 is 18% (0.18) or more.

  Further, the range to be reinforced, that is, the upper limit of the length of the reinforcing material 20 is for the purpose of further strengthening in a region exceeding the allowable stress value when the load sharing ratio is assumed to be 0.4 on the safest side. The height of the mold material (200 mm) is added to 2440 mm or less, and the ratio to the total length of the mold material 10 is preferably 61% (0.61) or less. In this example, the reinforcing materials 20 and 20 having a longer length are excessively strengthened, resulting in excessive weight increase.

  Further, the upper limit of the length of the reinforcing material 20 is 2040 mm or less exceeding the allowable stress value when the load sharing rate is assumed to be 0.4 on the safest side, that is, 51% (0 .51) It is further desirable that

  Next, a specific example of the lining plate 1 according to this embodiment will be described in comparison with a comparative example in which side plates are reinforced.

  In this specific example, based on the consideration of the lengths of the reinforcing members 20 and 20 described above, the reinforcing members 20 and 20 are made of high-tensile steel of 590 N class having a length of 1200 mm, a width of 75 mm, and a thickness of 6 mm. The side plates 40, 40, 50, 50 use SS400 having a thickness of 3.2 mm. In this case, as described above, it is possible to reinforce the longitudinal center portions of the lower flanges 12 and 12 of the outer mold members 10 and 10 which are the parts with the greatest load, and to ensure the strength required by law. The weight was 805.6 kg.

  On the other hand, when the required cross-sectional performance of the lining plate is obtained by increasing the thickness of the side plates 40, 40, 50, 50, the thickness of the side plate needs to be 6.0 mm in the standard product dimensions. In this case, the weight is It became 840.0 kg.

  As described above, in the lining plate 1 according to this embodiment, it is understood that the weight reduction of about 4% can be achieved as compared with the comparative example in which the side plate is reinforced as studied in the specific example.

  As described above, according to the lining plate 1 according to this embodiment, the longitudinal directions of the lower flanges 12 and 12 of the mold members 10 and 10 arranged on both outer sides of the mold members 10 connected in parallel. Since the reinforcing materials 20 and 20 are attached to the portion of the lining plate 1 where the greatest load acts, that is, the central portion, high strength can be secured while suppressing an increase in weight due to the reinforcing materials 20 and 20. .

  In particular, since the reinforcing material 20 is disposed not only in the entire length of the lining plate 1 but in the central portion in the longitudinal direction, an increase in weight due to excessive reinforcement can be suppressed.

  Thereby, it became possible to lengthen the lining board 1 compared with the past. And according to the lengthened lining board 1, the span of the receiving girder which supports a lining board can be lengthened, and the required number of lining boards for the laying area can be reduced. Convenience in building work can be improved.

  Moreover, since the steel plate prestress reinforcement | strengthening which attached the reinforcements 20 and 20 which gave the prestress was employ | adopted as a reinforcement | strengthening method with respect to the longitudinal direction center part of the mold flanges 10 and 10 arrange | positioned on both outer sides, The portion can be sufficiently strengthened to ensure high strength while suppressing an increase in weight due to the reinforcing materials 20 and 20.

  Further, since the reinforcing members 20, 20 are attached to the upper surface side of the lower flanges 12, 12, the reinforcing members 20, 20 are arranged inside the mold members 10, 10, and do not protrude outside the mold members 10, 10, so The outer dimensions of the work plate 1 can be formed compactly.

  As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to the said embodiment, In the range of the meaning, it can change suitably, For example, you may comprise as follows. .

  (1) In the above embodiment, the mold member 10 is made of H-shaped steel, but may be made of, for example, a steel material having a U-shaped cross section as long as it has a top flange, a lower flange, and a web.

  (2) In the above embodiment, the mold members 10 are joined together by welding, but other joining methods may be adopted. For example, by arranging a cross beam crossing the mold members 10 and connecting the mold members to the cross beam, the mold members 10 may be coupled through the cross beam.

  (3) In the above embodiment, the reinforcing members 20, 20 are attached only to the lower flanges 12, 12 of the outer mold members 10, 10, but the lower flanges 12, 12 of the second mold members 10, 10 from the outside A reinforcing material may be attached to the upper flanges 11, 11, etc. of the molds 10 on both outer sides to reinforce them.

  (4) In the above embodiment, the three high-strength bolts 30 on both sides of the reinforcing members 20, 20 are used as the means for connecting the reinforcing members 20, 20 to the lower flanges 12, 12. The coupling means may be adopted. Moreover, even if it is a case where bolt connection is performed, the number and arrangement | positioning are not limited.

  (5) In the above embodiment, 590N class high-tensile steel is exemplified as the reinforcing materials 20 and 20, but a material having a higher strength or a material having a lower strength may be employed.

  (6) In the above embodiment, the steel plate prestress reinforcement is used as the reinforcing means of the lower flanges 12 and 12 of the outer mold members 10 and 10, but other methods are adopted as long as the reinforcing method is to attach the reinforcing material. May be.

  (7) In the above embodiment, the total length of the lining plate 1 is configured to be 4 m longer than the conventional de facto standard size, but the total length of the lining plate 1 may be equivalent to the conventional case. Can improve strength and weight compared to conventional products.

It is a longitudinal cross-sectional view of the lining board concerning one Embodiment of this invention. It is a partially notched top view of the lining board concerning one Embodiment of this invention. It is a front view of the lining board concerning one Embodiment of this invention. It is an enlarged view which shows the attachment part of the reinforcing material in the lining board concerning one Embodiment of this invention. It is a graph which shows the load sharing rate of each type | mold material which comprises the lining board concerning one Embodiment of this invention. It is a graph which shows the bending tensile stress which acts on each part of the longitudinal direction of the type | mold material arrange | positioned at the outermost side of the lining board concerning one Embodiment of this invention.

Explanation of symbols

10 Mold material (H-shaped steel)
11 Upper flange 12 Lower flange 13 Web 20 Reinforcement material 30 High strength bolt 40 Side plate 50 Side plate

Claims (7)

In a lining plate in which a plurality of molds each having an upper flange, a lower flange and a web are connected in parallel,
A lining plate characterized by having a reinforcing material attached to the upper surface side of the longitudinal center portion of the lower flange of the mold material arranged on both outer sides.   The lining board of Claim 1 which gave the steel plate pre-stress reinforcement | strengthening which gives the pre-stress to the said reinforcing material and attaches. The lining board according to claim 1 or 2 , wherein the length of the reinforcing material is 8% to 61% of the entire length of the mold material. The lining board according to any one of claims 1 to 3 , wherein a thickness of the reinforcing material is not more than twice a thickness of the lower flange. The lining plate according to any one of claims 1 to 4, wherein the reinforcing material is attached to the upper surface side of the lower flange using a high-strength bolt. The lining board according to any one of claims 1 to 5, wherein the reinforcing material has a plate shape. The lining plate according to any one of claims 1 to 6, wherein the reinforcing material is high-tensile steel.

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