JP3225056U - Asphalt mat - Google Patents

Abstract

An asphalt mat that can be hung in a horizontal state is provided. Kind Code: A1 An anchor bolt mounting bracket disposed on a roadbed paper serving as a release agent, a first layer of asphalt mixture formed so as to bury a lower portion of the anchor bolt mounting bracket, and a first layer. A round bar 106 for positioning and fixing the anchor bolt mounting bracket on the asphalt mixture, a glass cloth 112 disposed on the first layer of asphalt mixture so as to expose the anchor bolt mounting bracket, and covering the glass cloth And a second layer of asphalt mixture 110b formed such that the upper surface of the anchor bolt fitting is not buried. [Selection] Figure 2

Description

  The present invention relates to an asphalt mat that can be suspended in a horizontal state.

  When constructing a marine structure such as a breakwater or quay, a rubble foundation is first constructed on the seabed ground, an asphalt mat is laid on this rubble foundation, and a caisson or other structure is placed on the asphalt mat. Install.

  The asphalt mat is used not only as a friction increasing member on a rubble foundation of an offshore structure, but also as a scouring prevention material and a suction prevention material on a quay.

  In the asphalt mat, an internal reinforcing member such as a glass cloth or a wire mesh is disposed between asphalt layers formed in upper and lower two layers, and wire ropes are disposed at predetermined intervals on a lower surface of the internal reinforcing member. Eye portions (suspension ring members) for handling asphalt mats are provided at both ends of the wire rope so as to protrude from both side ends of the asphalt mat. When lifting the asphalt mat, the eye portion is locked to a locking member of the hanging tool (Patent Document 1).

  The asphalt mat can be configured as any size. For example, in the case of configuring the marine structure or the like in accordance with the size of the bottom area for the purpose of increasing friction, the maximum size may be about 10 m × 50 m and the thickness may be about 10 cm at the maximum. Therefore, even when asphalt mats of an arbitrary size configured as one piece are laid so as to cover the foundation of the marine structure, the construction can be relatively easily performed by using a dedicated cargo handling device.

JP-A-10-204846

  As mentioned above, asphalt mats are generally constructed in large sizes. The asphalt mat is manufactured on land close to the construction site, and is transported in a suspended state using a cargo handling device such as a crane. Since the weight of the asphalt mat is very large, the weight supported by one wire inserted inside the asphalt mat is also very large.

  When the asphalt mat is moved while being supported by the suspension frame, the asphalt mat is largely curved by its own weight. For this reason, there is a problem that it is difficult to position the asphalt mat in a suspended state.

  In addition, when the cargo handling is repeatedly performed by a crane or the like, a large bending stress is applied to the asphalt mat. For this reason, it is necessary to pay sufficient attention to handling of the asphalt mat, and there is a problem that the efficiency of cargo handling is not good.

  Furthermore, when the asphalt mat is installed on a rubble foundation, accurate alignment is required. When the asphalt mat is bent, there is a problem that it is not easy to particularly position the end of the asphalt mat and the workability is poor.

  Therefore, an object of the present invention is to provide an asphalt mat that can be hung in a horizontal state.

  The asphalt mat of the present invention is an asphalt mat that is disposed between a lower surface of a structure and an upper surface of a foundation on which the structure is installed and increases friction between the structure and the foundation. An anchor bolt mounting bracket disposed on a roadbed paper serving as an agent, a first layer of asphalt mixture formed so as to bury a lower portion of the anchor bolt mounting bracket, and an anchor on the first layer of asphalt mixture. A reinforcing bar for positioning and fixing the bolt mounting bracket, a glass cloth arranged so as to expose the anchor bolt mounting bracket on the asphalt mixture of the first layer, and the anchor bolt mounting so as to cover the glass cloth. A second layer of asphalt mixture formed so that the upper surface of the metal fitting is not buried.

  According to the asphalt mat of the present invention, the asphalt mat can be suspended via the anchor bolt mounting bracket embedded in the asphalt mat. For this reason, by using a plurality of anchor bolt mounting brackets, the asphalt mat can be suspended in a horizontal state without being greatly bent by its own weight.

  Therefore, the problem that a large bending stress is applied to the asphalt mat is solved. Further, it is no longer necessary to pay close attention to handling of asphalt mat as in the past, and the problem that the efficiency of cargo handling is not good is solved. Further, since the alignment of the end of the asphalt mat is facilitated, the problem of poor workability is also solved.

It is a top view of the asphalt mat of the present invention. FIG. 2 is a partial sectional perspective view of the asphalt mat of FIG. 1. 4 is a flowchart of a procedure for manufacturing the asphalt mat of the present invention. 4 is a flowchart of the asphalt mat laying procedure of the present invention. FIG. 3 is a view showing a laid state of the asphalt mat of the present invention. FIG. 4 is a view showing the joint processing of the asphalt mat of the present invention. FIG. 4 is a view showing the joint processing of the asphalt mat of the present invention. It is a figure which shows the friction coefficient at the time of using the asphalt mat of this invention. It is a figure which shows the 1st reference form of an asphalt mat. It is a figure which shows the 2nd reference form of an asphalt mat. It is a figure which shows the use aspect of the asphalt mat of this invention. It is a figure which shows the use aspect of the asphalt mat of this invention. It is a figure which shows the use aspect of the asphalt mat of this invention.

  Hereinafter, the asphalt mat of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of the asphalt mat of the present invention.

  The asphalt mat 100 is manufactured according to the shape of a structure such as a rectangular shape as shown in the figure. The asphalt mat 100 is disposed between the lower surface of the structure and the upper surface of the foundation on which the structure is installed, and has an action of increasing friction between the structure and the foundation. The asphalt mat 100 may be manufactured on site at a size corresponding to the size of the base portion, or may be manufactured at a factory and divided into a plurality of sizes of the base portion at the site and spread on the site. good. If the size of the foundation is divided into a plurality of parts, the asphalt mat 100 can be manufactured in a factory, and transportation and construction are easy, so that the safety and efficiency of construction work are improved.

  In the asphalt mat 100, a plurality of anchor bolt fittings 104 are arranged on the entire surface of the asphalt mat 100. The arrangement density of the anchor bolt mounting bracket 104 is higher at the end of the asphalt mat 100 than at the center. As shown in the drawing, the left and right ends of the anchor bolt mounting bracket 104 are arranged more densely than the other parts. In the present embodiment, the arrangement density of the anchor bolt mounting brackets 104 is changed according to the place. However, the arrangement density may be evenly arranged on the entire surface of the asphalt mat 100. How to arrange the anchor bolt fittings 104 is determined in consideration of the safety of the asphalt mat 100 hanging operation and the efficiency of the operation.

  The anchor bolt fitting 104 is preferably arranged flush with the surface of the asphalt mat 100 so as not to protrude from the surface of the asphalt mat 100. By arranging in this manner, a plurality of asphalt mats 100 can be stacked and transported, or can be stored in an on-site state in a stacked state, so that transport efficiency can be improved and the storage space can be saved.

  FIG. 2 is a cross-sectional perspective view (portion A) of the asphalt mat of FIG. As shown in the drawing, the asphalt mat 100 includes an anchor bolt mounting bracket 104, a reinforcing bar including a round bar 106 and a band iron 108, first and second layers of asphalt mixture 110a, 110b, glass cloth 112, and an anchor. The bolt 114 is included.

  The anchor bolt mounting bracket 104 is disposed on the roadbed paper 102 that is to be a release agent. A rust prevention sheet 103 is interposed between the roadbed paper 102 and the bottom surface of the anchor bolt mounting bracket 104 to prevent the anchor bolt mounting bracket 104 from rusting. The round bar 106 fixes the anchor bolt mounting bracket 104.

  The anchor bolt mounting bracket 104 has an insertion hole 120 for an anchor bolt 114 or an eye bolt (not shown) used for suspending the asphalt mat 100 on the upper surface thereof. The insertion hole 120 of the anchor bolt 114 has a circular insertion portion 121 into which an end of the anchor bolt 114 can be inserted, and a long hole extending in one direction from the insertion portion 121 and having a size smaller than the circular size of the insertion portion 121. And a slide portion 122 having a shape of a circle.

  The eyebolt is used as a suspension member used when suspending the asphalt mat 100. The end of the eyebolt is inserted into the insertion portion 121 in the same manner as the anchor bolt 114, and is slid to the slide portion 122 and rotated by 90 °. Thus, the eyebolt is firmly attached to the anchor bolt mounting bracket 104, and the asphalt mat 100 can be lifted horizontally.

  When the anchor bolt 114 is attached to the anchor bolt mounting bracket 104, the end of the anchor bolt 114 is inserted into the circular insertion portion 121, and the anchor bolt 114 is slid into the elongated slide portion 122, and the anchor bolt 114 is attached. Tighten the bolt. As a result, the anchor bolt 114 is firmly attached to the anchor bolt mounting bracket 104. Although a caisson-like structure is formed on the asphalt mat 100, the anchor bolt 114 integrates the formed structure with the asphalt mat 100 to prevent the asphalt mat 100 from falling off the structure. It functions as a connecting member for prevention. Further, when a structure is formed on the asphalt mat 100, rebars are arranged in a mesh on the lower surface of the structure. The anchor bolts 114 also serve as spacers for providing a space between the rebar and the asphalt mat 100. Function. That is, the anchor bolt 114 plays two roles of the suspension member, the connection member, and the spacer.

  The first layer of asphalt mixture 110a is formed on the roadbed paper 102 and the rust prevention sheet 103 with a thickness of, for example, about 4 cm so that the lower portion of the anchor bolt mounting bracket 104 is buried. The asphalt mixture 110a of the first layer is formed by heating and mixing asphalt, filler (limestone powder), sand, and crushed stone. The first layer of asphalt mixture 110a may be a material that is environmentally friendly by mixing a recycled material for road pavement at a ratio of 5 to 10%. On the first layer of asphalt mixture 110a, a round bar 106 and a band iron 108 are arranged. The round steel 106 positions and anchors the anchor bolt mounting bracket 104 firmly.

  The glass cloth 112 has a hole at the position of the anchor bolt mounting bracket 104 so as to expose the anchor bolt mounting bracket 104 on the first layer of the asphalt mixture 110a and to further cover the round steel 106 and the band 108. Place the open one. The glass cloth 112 is obtained by subjecting a net-shaped knitted fabric having an eye interval of 1 to 4 cm to asphalt treatment or resin treatment.

  The asphalt mixture 110b of the second layer is formed to have a thickness of, for example, about 4 cm so as to cover the glass cloth 112 and not to bury the upper surface of the anchor bolt fitting 104. It is desirable that the surface of the asphalt mixture 110b and the surface of the anchor bolt fitting 104 be flush. At the same level, a plurality of asphalt mats 100 can be stacked and transported, or can be stored in an on-site state, so that transport efficiency can be improved and the storage space can be saved. In addition, the asphalt mixture 110b of the second layer is formed of the same material as the asphalt mixture 110a of the first layer.

  FIG. 3 is a flowchart of a procedure for manufacturing the asphalt mat of the present invention. The procedure for manufacturing the asphalt mat 100 will be described with reference to FIG.

  First, a mold having a size of the asphalt mat 100 is set on a production base (S101). Next, the roadbed paper 102 is laid on the entire surface of the formwork (S102). Next, a rust prevention sheet 103 is laid on the roadbed paper 102, and an anchor bolt mounting bracket 104 is set on the rust prevention sheet 103. Then, a round bar 106 is installed and fixed so that the anchor bolt mounting bracket 104 does not move. (S103).

  Then, the asphalt mixture 110a is cast with a thickness of about 4 cm (S104). Next, the belt 108 and the glass cloth 112 are set on the asphalt mixture 110a (S105). Then, the asphalt mixture 110b is cast with a thickness of about 4 cm (S106). Finally, the anchor bolts 114 are attached to the anchor bolt mounting brackets 104, the asphalt mat 100 is removed from the formwork, and temporarily placed in a temporary storage place (S107).

  By repeating the above procedure, a required number of asphalt mats 100 are manufactured. The size of the asphalt mat 100 is set to the size of a truck bed having a width of 2.5 m or less and a length of 12 m or less when the truck can be transported from the factory to the site.

  When the manufactured asphalt mat 100 is placed on the bottom of a caisson-like structure, a plurality of small-sized asphalt mats are provided on the floor of the caisson building yard so as to have a size corresponding to the bottom area of the structure. 100 is arranged vertically and horizontally to produce a large-sized mat member. When the large-sized mat member is manufactured in this manner, it is possible to solve the problem of the handling of the large-sized asphalt mat 100 and to shorten the construction period on site.

  FIG. 4 is a flowchart of the asphalt mat laying procedure of the present invention. The procedure for laying the asphalt mat 100 when manufacturing a large-sized mat member will be described with reference to FIGS.

  First, the asphalt mats 100 are transported and laid one by one on the floor of the caisson construction yard (S201). When manufacturing a large-sized mat member by laying a plurality of asphalt mats 100, as shown in FIG. 5, each of the asphalt mats 100 is laid with a certain gap 150 therebetween.

  Next, joint processing is performed to close the gap 150 between the asphalt mats 100 (S202). The joint processing includes a form in which the gap 150 is closed with the joint sheet 160 as shown in FIG. 6 and a form in which sand 180 is poured into the bottom surface of the gap 150 and the blown asphalt 170 is poured thereon as shown in FIG. If the joint processing that blocks the gap 150 is not performed, concrete enters the gap 150 when the caisson is manufactured. Concrete that has entered gap 150 weakens the effect of increasing the friction of the mat member. As shown in FIG. 6, the joint processing for closing the gap 150 with the joint sheet 160 only involves attaching the joint sheet 160, so that the workability is good and the safety is high. As shown in FIG. 7, the joint processing in which sand 180 is put into the bottom surface of the gap 150 and the blown asphalt 170 is poured on the sand 180 has to flow the blown asphalt 170 heated to about 200 ° C. into the gap 150. Workability and safety are inferior to joint processing.

  Lastly, the anchor bolts 114 are attached to all the anchor bolt fittings 104 of the mat member composed of the plurality of asphalt mats 100, and the anchor bolt installation process ends. In this state, a structure such as a caisson is manufactured on the mat member.

  When the coefficient of friction between the caisson manufactured as described above and the upper surface of the foundation was measured, the following results were obtained. FIG. 8 is a diagram showing the coefficient of friction when the asphalt mat of the present invention is used.

  For the measurement of the coefficient of friction, a sliding test was performed by laying a mat member on the bottom surface of the weight type structure. The relationship between the displacement of a heavy-duty structure and the coefficient of friction was determined by sliding experiments. As a result, the coefficient of static friction rapidly reached a peak value at first, and the coefficient of kinetic friction after sliding gradually decreased to a constant value.

  Detailed results show that the measured coefficient of static friction was at least 0.8 or more as shown in the figure. When a coefficient of static friction of 0.8 or more is obtained, the width of the caisson is reduced by 33%, and the overall cost can be reduced by up to about 20%. For this reason, compared with a caisson manufactured without using a mat member, a slim breakwater can be obtained, and there is no feeling of intimidation and the landscape is not adversely affected. Even with such a reduced caisson width, the caisson will not slide with large waves.

  FIG. 9 is a diagram showing a first reference embodiment of the asphalt mat. The configuration of the asphalt mat of the first embodiment has a configuration similar to the configuration of the asphalt mat of the above embodiment. The asphalt mat 100A of this embodiment includes a round bar 106, an annealed iron wire 107, a band iron 108, a degreasing wire rope 111 with a non-slip metal, a glass cloth 112, and asphalt mixture materials 110a and 110b.

  The degreasing wire rope 111 is used when suspending the asphalt mat 100A. Since a large force acts on the degreasing wire rope 111 at the time of suspension, the non-slip metal rope 109 has a non-slip fitting 109 firmly fixed thereto. The annealed iron wire 107 is used to entangle the asphalt mat 100A with a reinforcing bar on the bottom of the caisson and fix it.

  The first layer of asphalt mixture 110a is formed with a thickness of about 4 cm.

  The annealed iron wire 107 is connected to and integrated with the round steel 106. The non-slip metal rope 109 is fixed to the degreasing wire rope 111 to constitute the non-slip metal rope 111 with the non-slip metal.

  The glass cloth 112 is disposed on the first layer of the asphalt mixture 110a so as to cover the round steel 106, the band iron 108, and the degreasing wire rope 111 with the non-slip metal fitting. The glass cloth 112 is obtained by subjecting a net-shaped knitted fabric having an eye interval of 1 to 4 cm to asphalt treatment or resin treatment.

  The asphalt mixture 110b is formed so as to cover the glass cloth 112. The annealed iron wire 107 and the degreasing wire rope 111 are made to protrude from the asphalt mixture 110b.

  The asphalt mat 100A of FIG. 9 is manufactured by a procedure similar to the procedure shown in FIG. First, a mold having the size of the asphalt mat 100 is set on the production base surface. Next, the asphalt mixture 110a is cast with a thickness of about 4 cm. Then, on the asphalt mixture 110a, the round steel 106, the annealed iron wire 107, the band iron 108, the degreasing wire rope 111 with the non-slip metal fitting are installed, and the glass cloth 112 is installed thereon. Next, the asphalt mixture 110b is cast with a thickness of about 4 cm. Finally, the asphalt mat 100 is removed from the formwork and temporarily placed in a temporary storage place.

  FIG. 10 is a view showing a second reference embodiment of the asphalt mat. The configuration of the asphalt mat of the second embodiment also has a configuration similar to the configuration of the asphalt mat of the above embodiment. The asphalt mat 100B in FIG. 10 is laid on a rubble mound. The asphalt mat 100B of this embodiment includes a round steel 106, a band iron 108, a degreasing wire rope 111 with a non-slip metal, a glass cloth 112, and asphalt composite materials 110a and 110b.

  Round steel 106, band iron 108, degreasing wire rope 111 with non-slip metal, glass cloth 112, and asphalt mixture materials 110a and 110b are the same as those of asphalt mat 100A in FIG. The procedure for manufacturing the asphalt mat 100B in FIG. 10 is the same as the procedure for manufacturing the asphalt mat 100A in FIG.

  FIG. 11 to FIG. 13 are views showing a use mode of the asphalt mat of the present invention.

  FIG. 11 shows a case where the asphalt mat of the present invention is used for increasing the frictional resistance of the straight block. By installing an asphalt mat between each block, the frictional resistance between each block can be increased. Cross piles are used for river and sea revetment. Normally, the size of each block increases because the weight of each block protects the embankment from river water and sea waves. However, as shown in FIG. 11, by installing the asphalt mat of the present invention between the blocks, the cross section of each block can be reduced, and the size of each block can also be reduced. This is because the coefficient of friction between the blocks when the asphalt mat is installed between the blocks is larger than the coefficient of friction between the blocks when the blocks are directly stacked. The weight and size of each block can be reduced to the extent that each block is less likely to be displaced by an external force.

  FIG. 12 is used for saving cross sections of breakwaters and seawalls. By installing the asphalt mat on the bottom of the caisson, the coefficient of friction between the foundation and the caisson is increased, and the caisson can be more firmly prevented from sliding.

  FIG. 13 shows a case where the bottomless caisson is also used to prevent the leakage of the filling material. As shown in the figure, by laying an asphalt mat having an area larger than the bottom area of the underwater concrete, it is possible not only to prevent the caisson from slipping but also to prevent leakage of the filling material of the bottomless caisson.

  The asphalt mat of the present invention has been described above. According to the asphalt mat of the present invention, the asphalt mat can be hung via the anchor bolt mounting bracket embedded in the asphalt mat, and thus can be hung in a horizontal state. For this reason, a large bending stress is not applied to the asphalt mat, and the handling of the asphalt mat does not need to be as careful as in the past, so that the efficiency of cargo handling is improved. Further, since the alignment of the end of the asphalt mat is facilitated, workability and safety are improved.

  It goes without saying that the technical scope of the asphalt mat of the present invention includes all aspects that can be modified within the scope of the technical idea of the present invention.

100, 100A, 100B Asphalt mat 102 Roadbed paper,
103 Rust prevention sheet 104 Anchor bolt mounting bracket 106 Round bar 107 Annealed iron wire 108 Band iron 109 Slip bracket 110a First layer asphalt mixture 110b Second layer asphalt mixture 111 Degreasing wire rope 112 Glass cloth 114 Anchor bolt 120 Insertion hole 121 Insertion part 122 Slide part 150 Clearance 160 Joint sheet 170 Blown asphalt 180 Sand

Claims (7)

An asphalt mat arranged between a lower surface of a structure and an upper surface of a foundation on which the structure is installed to increase friction between the structure and the foundation,
Anchor bolt mounting brackets arranged on roadbed paper that will be a release agent,
A first layer of asphalt mixture formed so as to bury the lower portion of the anchor bolt mounting bracket;
A reinforcing bar for positioning and fixing the anchor bolt mounting bracket on the asphalt mixture of the first layer;
A glass cloth disposed on the asphalt mixture of the first layer so as to expose the anchor bolt mounting bracket,
A second layer of asphalt mixture formed so as to cover the glass cloth and not to bury the upper surface of the anchor bolt mounting bracket;
Asphalt mat with. The anchor bolt mounting bracket,
The asphalt mat according to claim 1, wherein a plurality of the asphalt mats are arranged on the entire surface of the asphalt mat. The anchor bolt mounting bracket,
The asphalt mat according to claim 2, wherein the arrangement density is higher at an end portion of the asphalt mat than at a center portion. The anchor bolt mounting bracket,
The asphalt mat according to any one of claims 1 to 3, wherein an insertion hole for an anchor bolt used when suspending the asphalt mat is formed on an upper surface thereof.   The insertion hole of the anchor bolt has a circular insertion portion into which an end of the anchor bolt can be inserted, and an elongated hole extending in one direction from the insertion portion and having a dimension smaller than the circular dimension of the insertion portion. The asphalt mat according to claim 4, comprising a slide portion.   The asphalt mat according to any one of claims 1 to 5, further comprising an anchor bolt attached to the anchor bolt attachment.   Anchor bolts attached to the anchor bolt mounting bracket, as a hanging member used when suspending the asphalt mat, as a connecting member for integrating the structure and the asphalt mat to prevent falling off, the structure, The asphalt mat according to claim 6, wherein the asphalt mat is used as a reinforcing bar spacer arranged in a mesh on the lower surface of the object.