JP2016044803A - Connecting structure for corrugated metallic plate member, connecting method and temporary fixing washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a temporary fixing washer closely fitted to a bolt to prevent the bolt from being pulled down out of a bolt insertion hole to be easily inserted to the bolt when the end portions of two corrugated metallic plate members contacted with a ground are connected with bolt.SOLUTION: A bolt 3 is inserted from a ground surface side into a bolt insertion hole 1c of an end part 1f (a crest part p seen from a curved inside) of one corrugated metallic plate member 1 and inserted up to a contacted state to an upper surface of the member under a state in which a temporary fixing washer 5 is flexed to a threaded part 3b protruded above. A bolt temporary fixing hole 7 has semi-circular recess parts 7a and is formed by opposing bolt supporting parts 7b, its both sides are provided with recesses 8. The temporary fixing hole 7 can be expanded under its flexed state and can be easily inserted into the bolt, upon releasing fingers to release the flexed state to attain a flat state, resulting in that the hole inner edge enters into a groove of the thread part of the bolt and engaged with the bolt. Since the temporary fixing washer is flexed to expand the temporary fixing hole and inserted into the bolt, force is hardly required and it can be easily inserted into the bolt.SELECTED DRAWING: Figure 7A

Description

  This invention is for constructing corrugated metal plate members for civil engineering work such as corrugated U-shaped flumes and corrugated pipes in which corrugated metal plates that have been corrugated are bent in an arc shape or U shape in a direction perpendicular to the corrugated direction. Furthermore, the present invention relates to a corrugated metal plate member connecting structure for connecting bolted ends of two corrugated metal plate members, a connecting method, and a temporary fixing washer used therefor.

Corrugated metal plate members such as corrugated U-shaped flumes and corrugated pipes as described above are known as waterway materials used for agricultural waterways, industrial waterways, temporary drainage channels for civil engineering, and the like. In the case of a corrugated pipe, it is also used as a simple tunnel or a culvert under the road in addition to the water channel.
In general, this type of corrugated metal plate member is connected to each other by overlapping the end portions that are ridges of waves as viewed from the inside of the curve, and the bolts are inserted into the bolt insertion holes formed at the respective end portions. It is carried out by inserting from the member lower surface side near the center and projecting to the inside of the curve (the member upper surface side near the center in the member width direction), screwing the nut to the projecting bolt and fastening it.

  Patent Document 1 is a case of a corrugated steel pipe having a circular cross section obtained by combining two semicircular corrugated steel sheets obtained by corrugating corrugated steel sheets curved in a semicircular shape, and improving the roughness coefficient as a water channel. In order to achieve this, conventionally, a paving material mainly composed of bituminous material is coated on the inner surface of a semicircular corrugated steel sheet at a factory. By attaching the bolts to the inner surface of the steel plate, it is not necessary to paint the pavement material on the joints between the semicircular corrugated steel plates on site, thereby eliminating the problem of the working environment and the roughness. Although the coefficient can be improved and the economic efficiency can be improved, as shown in FIG. Bolt as the binding portions described above, and has the structure for connecting is indicated by a nut.

In FIG. 13, the connection structure between the semicircular corrugated steel plates 51 and 51 is basically an end portion that is a wave crest p when viewed from the inside of the curve (upper side in FIGS. 13A and 13B). 51f are overlapped, and the bolt 53 is inserted from the outside of the curve (the lower side in FIGS. 13 (a) and (b)) with the curved washer 52 interposed in the bolt insertion hole 51c formed in each end 51f. It is a bolt connection structure that protrudes inward of the curve, and that is screwed onto the protruding bolt 53 by screwing a nut 54.
However, for the bolt connection portion that is placed on the ground, particularly in the vicinity of the center in the width direction, as shown in an enlarged view in FIG. Intervene. This is because in the state where the end portions of the two semicircular corrugated steel plates 51 and 51 are overlapped, the hand and tool do not reach the lower surface of the central portion in the member width direction in contact with the ground, and the bolt head 53a cannot be pressed. This is because the bolt 53 falls off in the state where the temporary fixing washer 55 is not provided.

Generally, for example, if the bolt 53 is M10 (outer diameter 10 mm) as this type of temporary fastening washer, as shown in FIG. A temporary fixing washer 55 made of a steel plate having four protrusions 55b formed by opening a temporary fixing hole 55a and bending an acute angle tip is used. Each protrusion 55b is slightly inclined toward the center. The inner diameter of the bolt temporary fixing hole 55a (distance between the projections 55b) is slightly smaller than the outer diameter of the bolt, and it is put on the threaded portion of the bolt 53 and forcedly pushed toward the bolt head 53a without rotating. The bolt 53 is tightly fitted to the threaded portion 53b to prevent the bolt 53 from falling off.
In Patent Document 1, only a temporary reference to the washer 55 is mentioned, and there is no description of the shape, material, etc., but this is generally considered to be the case.

By the way, if the waterways such as the above-mentioned agricultural waterways, industrial waterways, and temporary waterways for civil engineering work are places where sand etc. is always mixed in along with the flow of water, the water and sand flow down together, so they are worn locally. There are things to do. The above corrugated U-shaped flume and corrugated pipe are generally made of steel and are often galvanized for the purpose of improving corrosion resistance. However, when local wear due to sand progresses, the metal part inside the plated layer May be exposed and corrosion due to rust may occur.
Moreover, when using as the above-mentioned simple tunnel or a culvert under a road, it has been performed that a long-term installation is possible by providing a plating layer on the surface of a steel material.
As disclosed in Patent Document 2, a small drainage groove installed on the floor surface of a building kitchen or the like is a simple stainless steel plate formed in a U-shaped cross section, but a corrugated U-shaped flume. Stainless steel corrugated metal plate members for civil engineering such as corrugated pipes are not known.

JP-A-8-270840 JP2011-157756

When the steel temporary fixing washer 55 as shown in FIG. 14 is put on the screw portion of the bolt 53 and pushed toward the bolt head without being rotated, the steel material is pushed by being elastically deformed. There is a problem that a strong force is required and workability is poor. Bolts that can be pushed in with a light force can be securely held by bolts, and the bolts cannot be held securely. In order to manufacture it, it is necessary to make the size of the bolt temporary fixing hole with respect to the bolt diameter the optimum dimension with high accuracy. However, it is not easy to uniformly produce the optimum dimension with high accuracy. You will need strong power.
The temporary washer 55 is manufactured by making a die and pressing it. However, since the cost of the die is high, the cost of the temporary washer 55 is high even if it is small.

In addition, when a corrugated U-shaped flume or corrugated pipe is installed at a site where corrosion is a concern, or when extremely long-term installation is required, a stainless steel material such as Patent Document 2 is used on the main body to ensure high corrosion resistance. It is possible to use it.
In this case, when the steel temporary fixing washer is used as the temporary fixing washer used for the bolt connecting portion, the main body portion using the stainless steel and the steel temporary fixing washer are dissimilar metals. , Contact corrosion of dissimilar metals will proceed.
Therefore, when a stainless steel material is used for the main body portion, it is considered that the temporary fixing washer is also made of stainless steel, which is the same material as the main body portion. However, even if it is a steel temporary fixing washer, the engagement with the bolt requires a certain amount of force because it is pushed in while elastically deforming the steel material. When using a stainless temporary fixing washer, It itself is harder and requires more force than steel, and it is not easy to push it in with fingers. For this reason, there is a concern that the temporary fixing washer used for the purpose of facilitating the construction becomes very difficult to use.
Also, if you want to release the temporary holding state of the bolt by removing the temporary fixing washer for any reason, a steel or stainless steel washer that is hard and not easily deformed will fit into the groove of the bolt, so remove the washer by deforming it. This was difficult, and could not be removed unless it was rotated according to the thread groove.
In addition, stainless steel is expensive, and the mold for manufacturing is expensive because it also processes stainless steel. Using stainless steel for temporary fixing washers that do not contribute to the rigidity of the main part of corrugated U-shaped flume etc. It is uneconomical.

   The present invention has been made in order to solve the above-described problems. When connecting the end portions of the corrugated metal plate members to each other with bolts, the workability of the operation of attaching temporary fixing washers to the bolts to prevent the bolts from falling off. The corrugated metal plate member, which can reduce the production cost of the temporary washer, and can prevent the occurrence of contact corrosion of dissimilar metals when the corrugated metal plate member is made of stainless steel. It is an object of the present invention to provide a structure, a connecting method, and a temporary fixing washer used therefor.

The invention according to claim 1 which solves the above-mentioned problem is characterized in that two corrugated metal plate members obtained by curving corrugated metal plates in a direction orthogonal to the corrugated direction in an arc shape or a U shape are opposed to each other. It is a connection structure of corrugated metal plate members that are arranged on the soil foundation in piles and are connected to each other by bolts through bolt insertion holes formed at positions facing the soil foundation at the respective ends.
The flexible washer plate has a substantially arc-shaped concave portion and a bolt temporary fixing hole formed by the opposed bolt support portions, and is formed in at least one of the opposed bolt support portions. On both sides of the plate body width direction, a temporary fixing washer formed in such a manner that a notch extending to the front of the washer outer end in a direction substantially orthogonal to the plate body width direction leads to the substantially arc-shaped recess,
The temporary fixing washer is bent in a curved shape by an additional bending force applied from both outer sides in a direction orthogonal to the plate body width direction, and the diameter of the bolt temporary fixing hole is set to the outer diameter of the screw portion of the bolt. In the expanded state, the bolt is inserted into the bolt until it approaches or comes into contact with the upper surface of the member, and the bolt is tightly fitted into the bolt temporary fixing hole by releasing the bending additional force and eliminating the bending. As a combined state, it is held at the bolt insertion hole position,
The bolt insertion hole at the end of the other corrugated metal plate member is passed through the bolt held at the bolt insertion hole position at the end of the one corrugated metal plate member, and a nut is screwed into the bolt. The two corrugated metal plate members are attached to each other by bolts.

 According to a second aspect of the present invention, there is provided the corrugated metal plate member connecting structure according to the first aspect, wherein the substantially arc-shaped recesses of the opposing bolt support portions of the temporary fixing washer facing each other form a semicircular shape. The overall hole has a circular shape with an inner diameter smaller than the thread diameter of the screw thread and larger than the thread valley diameter, and the notches on both sides of the bolt temporary fixing hole are formed in the semicircular recesses. It is characterized by communicating with the recess through an auxiliary cut extending in the plate width direction from the end.

  According to a third aspect of the present invention, there is provided the corrugated metal plate member connecting structure according to the first aspect, wherein the substantially arcuate recesses of the opposing bolt support portions of the temporary fixing washer facing each other have a narrow arc shape whose width is smaller than a semicircle. As a whole, two narrow arc-shaped concave portions are opposed to each other with a space therebetween, and the two arcs are part of a circular shape having an inner diameter smaller than the thread diameter of the screw thread and larger than the thread valley diameter. The inner dimension in the plate width direction at the intermediate portion of the bolt temporary fixing hole is a size that does not constrain the outer diameter of the threaded portion of the bolt.

  According to a fourth aspect of the present invention, there is provided the corrugated metal plate member connecting structure according to any one of the first to third aspects, wherein the notch on both sides of the bolt support portion in the temporary fixing washer is only on one of the opposing bolt support portions. It is formed.

  In the connection structure of the corrugated metal plate member according to any one of claims 1 to 3, the notch on both sides of the bolt support portion in the temporary fixing washer is formed in both of the opposing bolt support portions. It is characterized by being.

The invention of claim 6 is a temporary fixing washer used for the connection structure of the corrugated metal plate member of claim 1,
The flexible washer plate has a substantially arc-shaped concave portion and a bolt temporary fixing hole formed by the opposed bolt support portions, and is formed in at least one of the opposed bolt support portions. A notch extending to the front side of the washer outer end in a direction substantially orthogonal to the plate width direction is formed on both sides in the plate width direction in a form leading to the substantially arc-shaped recess.

According to the seventh aspect of the present invention, the corrugated metal plate subjected to corrugation processing is curved in a direction perpendicular to the corrugation direction into an arc shape or a U-shape, and the two corrugated metal plate members facing each other are overlapped on the soil foundation. The corrugated metal plate member is a connecting method in which bolt insertion holes connected to each other by bolts are arranged at positions facing the soil foundation at each end,
The flexible washer plate body has a substantially arc-shaped concave portion and a bolt temporary fixing hole formed by an opposing bolt support portion, and is formed in at least one of the opposing bolt support portions. Using temporary fixing washers formed on both sides of the plate body width direction in a manner that leads to the front of the washer outer end in a direction substantially perpendicular to the plate body width direction, leading to the substantially arcuate recess,
The diameter of the bolt temporary fixing hole is made to be the outer diameter of the screw portion of the bolt by bending the temporary fixing washer in a curved shape with an additional bending force applied from both outer sides in a direction orthogonal to the plate body width direction. In the expanded state, insert the bolt until it approaches or contacts the upper surface of the member,
Next, by releasing the bending additional force and eliminating the bending, the bolt is held in the bolt insertion hole position as a state of being closely fitted to the bolt temporary fixing hole,
Next, the bolt insertion hole at the end of the other corrugated metal plate member is passed through the bolt held at the position of the bolt insertion hole at the end of the one corrugated metal plate member, and the nut is screwed into the bolt. It is characterized in that both corrugated metal plate members are connected to each other by bolts.

In the corrugated metal plate member connection structure of the present invention, if the temporary fixing washer is bent by pinching both ends in the direction orthogonal to the plate width direction with, for example, a finger of one hand, the diameter of the bolt temporary fixing hole is It will be in the state expanded more than the outer diameter of the screw part of a bolt.
Therefore, when bolting the bolt insertion holes where the two corrugated metal plate members placed on the soil foundation (ground) are in contact with the ground at the time of construction, the temporary fixing washer is pinched with one finger and bent. The bolt can be easily inserted into the bolt inserted through the bolt insertion hole at the end of one corrugated metal plate member from the lower surface side of the member and protruded toward the upper surface of the member until it contacts the upper surface of the member.
Next, when the finger force is loosened to eliminate the bending of the temporary washer and make it flat, the diameter of the bolt temporary fixing hole is reduced to the original state, and the inner edge of the bolt temporary fixing hole is the threaded portion of the bolt. Therefore, the bolt can be held in the bolt insertion hole position in a state in which the bolt is closely fitted in the bolt temporary fixing hole. Thus, the bolt is temporarily fixed at the bolt insertion hole position, and is kept upright without falling off.
In this state, the bolt insertion hole at the end portion of the other corrugated metal plate member is covered with the bolt that is temporarily fixed at the bolt insertion hole position at the end portion of the one corrugated metal plate member to maintain the upright state. The other corrugated metal plate member can be overlaid on the end of the one corrugated metal plate member.
In the state where the ends of both corrugated metal plate members are stacked, the bolt head cannot be pressed because the hand or tool cannot reach the bolt head on the soil foundation side (ground side) of the bolt insertion hole. Since it is temporarily fixed to the bolt insertion hole, the bolt connection work is possible.
If the washer is simply a circular hole in the washer plate, the inner diameter (internal dimension) in the bending direction of the circular hole is reduced when the washer is bent. However, in the present invention, the notch is formed on both sides of the bolt support part that forms the bolt temporary fixing hole, and the right and left parts of the washer plate body are separated from the parts (both outer side parts of the bolt support part). There is a street action (an action that expands in the bending direction of the bolt temporary fixing hole (left-right direction in FIG. 8)).

The temporary fixing washer of the present invention can be easily inserted into the bolt with little force required unlike the conventional temporary fixing washer because the bolt temporary fixing hole is enlarged by bending with a finger of one hand, for example. Can do.
In addition, when the finger force is loosened and returned to the original flat state, the inner edge of the bolt temporary fixing hole easily engages with the groove of the screw part of the bolt, so there is no risk that the temporary fixing washer will come out of the bolt. Bolts can be firmly fixed temporarily.
Even when removing, the bolt temporary fixing hole is enlarged by bending with a finger, so that it can be easily removed from the bolt with almost no force required.
Further, since the temporary washer can be picked up and operated with one hand, it is possible to perform some operation with the other free hand, and the workability is also good in this respect.
As described above, the bolt can be easily inserted into the bolt with almost no force and can be engaged with the screw groove of the bolt, so that the bolt temporary fixing work is extremely simple as compared with the conventional temporary fixing washer. Therefore, workability is good and the construction efficiency of the corrugated metal plate member itself is improved.

As described above, the temporary fixing washer of the present invention is inserted into the bolt by bending the bolt temporary fixing hole by bending, so that the inner diameter of the bolt temporary fixing hole is small enough to enter the depth of the screw groove of the bolt. The inner diameter can be set, and a necessary engaging force with respect to the bolt can be secured even if the plate thickness is reduced. Therefore, even when a steel material is used, the plate thickness can be reduced and the weight can be significantly reduced as compared with the conventional steel washer 55, and the handling is easy.
Moreover, since there is no projection 55b like the conventional steel temporary fix washer 55, it is easy to handle when storing or carrying it, and it is not necessary to distinguish between the front and the back. There is no complication in checking the front and back.
In addition, the flexibility is remarkably higher than that of the conventional steel washer 55, and even if it is interposed between the corrugated metal plate members at the peak portion, it fits into the curved surface of the peak portion, so the gap generated between the corrugated metal plate members is minimal. This is preferable because it is sufficient.

  According to a second aspect of the present invention, the bolt temporary fixing holes formed between the opposing bolt support portions are circular, and the cuts on both sides thereof are provided away from the bolt temporary fixing holes in the plate body width direction. According to the present invention, the entire circumference of the bolt temporary fixing hole can be engaged with the screw groove of the bolt. Therefore, the engagement force with the bolt is strong, and the bolt can be reliably prevented from falling off.

  As in claim 4, when the notches on both sides of the bolt support portion are formed only on one of the opposing bolt support portions, the substantially arc-shaped concave portion of the bolt support portion on the non-notched side is a washer plate. It can be said that the integrity of the whole body is high and the strength of the bolts is high.

  In the case where the notches on both sides of the bolt support portion are formed in both of the opposing bolt support portions as in claim 5, the shape or the shape is symmetrical, so that the operation or handling when engaging with the bolt is performed. Can be said to be easy.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing two corrugated U-shaped flumes to be connected to each other, and FIG. FIG. 6 is an enlarged plan view of an intermediate portion omitted in a state in which end portions of two corrugated U-shaped flumes are connected with overlapping bolts, and (C) is a schematic left side view of the corrugated U-shaped flume of (B). It is a perspective view of the corrugated U-shaped flume. It is AA expanded sectional drawing of FIG. It is BB expanded sectional drawing of FIG. 1 (b) (however, an expansion rate differs from FIG. 3). It is a principal part enlarged view of FIG. It is CC sectional drawing of FIG. It is a figure explaining the first half of the procedure which bolts the edge parts of corrugated U-shaped flume like FIG. It is a figure explaining the second half following FIG. 7A of the procedure which bolt-connects the edge parts of corrugated U-shaped flume like FIG. FIGS. 5A and 5B show a temporary washer in FIG. 5 and the like. FIG. 5A is a plan view, and FIG. It is a figure explaining what the internal diameter of the hole for bolt temporary fixing becomes when the temporary fixing washer of the Example of FIG. 8 is bent. The other example of a temporary fix washer is shown, (A) is a top view, (B) is the figure which entered the dimension of each part in the figure of (A). (A), (b) is a top view which shows the modification of the hole for bolt temporary fixing in the temporary fix washer of FIG. 10, respectively. (A), (b), (c), (d), and (e) are plan views showing other examples of the temporary fixing washer. For explaining a conventional example, (a) is a cross-sectional view of a bolt connecting portion between end portions of a corrugated pipe, and (b) is an enlarged view of a main part of (b). The conventional temporary fix washer is shown, (A) is a plan view, (B) is a DD sectional view of (A).

  Hereinafter, the connection structure of the corrugated metal plate member of the present invention, the connection method, and the form for carrying out the temporary fixing washer used therewith will be described with reference to the drawings.

The present invention relates to a corrugated metal plate member such as a corrugated U-shaped flume or a corrugated pipe obtained by curving a corrugated metal plate such as a corrugated steel plate or a corrugated stainless steel plate in an arc shape or a U shape in a direction orthogonal to the corrugated direction. It is applied when constructing.
FIG. 1 illustrates an embodiment of a connecting structure for corrugated metal plate members according to the present invention. The illustrated example is for a case where a water channel is formed by a corrugated U-shaped flume 1.
FIG. 1 (a) is a plan view showing two corrugated U-shaped flumes 1 and 1 that are to be connected to each other, and FIG. 1 (B) is an end view of the two corrugated U-shaped flumes 1 and 1 of FIG. FIG. 2 is an enlarged plan view of the intermediate portion omitted shown in a state where they are overlapped and connected with bolts, and (c) is a schematic left side view of the corrugated U-shaped flume 1 of (a).
FIG. 2 is a perspective view showing the appearance of the corrugated U-shaped flume 1.

  The corrugated U-shaped flume 1 in the illustrated example has a corrugated cross section in which crests and troughs (the crests viewed from the inside of the curve are indicated by p and the troughs are indicated by q) in the longitudinal direction that is the flow path direction. A corrugated steel plate or a corrugated stainless steel plate is generally formed into a U-shaped groove shape, and in the illustrated example, the U-shaped groove portion 1a has flange portions 1b at both left and right ends. Bolt insertion holes for connecting the corrugated U-shaped flumes 1 are formed at both ends in the longitudinal direction. In the illustrated example, a bolt insertion hole 1c at the center in the width direction of the U-shaped groove portion 1a, two bolt insertion holes 1d on both sides thereof, and two bolt insertion holes 1e on the left and right flange portions 1b are formed. ing.

  When constructing a water channel using a corrugated U-shaped flume, when the corrugated U-shaped flumes 1 and 1 are connected to each other by bolts, the corrugated U-shaped flumes 1 and 1 are connected in a state where they are placed on the ground (soil foundation). In the portion of the bolt insertion hole that is exposed in the space, that is, in this embodiment, in the portion of the bolt insertion holes 1d and 1e other than the bolt insertion hole 1c at the center in the width direction in FIG. As shown in FIG. 3, the corrugated U-shaped flume 1 is overlapped with bolts 3 'as shown in FIG. The bolt head is indicated by 3a ′.

However, at the portion of the bolt insertion hole that is in contact with the ground, that is, at the portion of the bolt insertion hole 1c at the center in the width direction of the U-shaped groove portion 1a, the bolt 3 falls off as shown in an enlarged view in FIG. A temporary fixing washer 5 is interposed for temporary fixing so as not to occur.
This is because the soil foundation side (the ground side), which is the back side of the bolt insertion hole 1c portion located at the peak portion when viewed from the inside of the curve, is a gap with respect to the ground, so that it was inserted into the bolt insertion hole 1c from the ground side. The bolt 3 falls off unless its head 3a is supported from the ground side. However, when the end portions 1f of the corrugated U-shaped flumes 1 and 1 are overlapped with each other, a hand or This is because the tool 3 does not reach and the bolt head 3a cannot be pressed, so that the bolt 3 falls off unless the bolt 3 is temporarily fixed. Even when the mountain is low, the installation location is generally uneven on the excavated ground or the like, and there are many cases where a large gap is formed on the back side of the mountain, so a temporary washer is essential.

In the present invention, for example, a washer plate having flexibility that can be bent with a finger of one hand is used. In the embodiment, a temporary fixing washer made of polypropylene (PP) is used, but other hard resins (including rubber) can be used, and a metal such as steel may be used.
FIG. 8 shows a temporary fixing washer 5 according to an embodiment of the present invention. FIG. 8 (a) is a plan view, and FIG. 8 (b) is a diagram in which the dimensions of each part are entered in FIG. In addition, although the below-mentioned notch 8 was shown by the aspect which has a clearance gap in FIG. 8 (a), it showed with the simple line segment in FIG. 8 (b) and FIG. 10, FIG. 11, FIG.
In the illustrated example, the temporary fixing washer 5 has a semicircular recess 7a at the center of a washer plate 6 that is flexible enough to be bent with a finger of one hand, and is opposed to a bolt support portion. It has a bolt fixing hole 7 formed by 7b. The bolt temporary fixing hole 7 as a whole has a circular shape with an inner diameter smaller than the outer diameter d (thread diameter) and larger than the thread valley diameter d1 (thread groove diameter). And each bolt support part 7b is a washer outer end in the direction (FIG. 8 (A) left-right direction) orthogonal to a plate body width direction on both sides of the plate body width direction (FIG. 8 (A) vertical direction). This notch 8 extends to the front of the recess 7a via an auxiliary notch 9 having a length of 3 mm extending from the end of the recess 7a in the plate width direction.
The shape and dimension of the bolt temporary fixing hole 7 is such that when the entire temporary fixing washer 5 is bent in a direction orthogonal to the plate body width direction, the bolt temporary fixing hole 7 allows the threaded portion of the bolt to pass therethrough. The outer edge of the bolt (the outer diameter of the bolt (the outer diameter of the threaded portion) d) becomes larger and the inner edge of the bolt temporary fixing hole 7 is engaged with the groove of the threaded portion of the bolt when the bend is released to make it flat. has a geometry such that the size (i.e. root diameter at smaller than the outer diameter d of the bolt (larger than the root diameter) d ₁ of the threaded portion) that.
The semicircular recess 7a does not need to be strictly a semicircle having a circular curvature, and may be a substantially semicircular shape having a slightly larger curvature than the circle.

The temporary washer 5 of the embodiment shown in FIG. 8 has an elliptical shape with a plate thickness of 0.35 mm, a major axis of 45 mm, and a minor axis of 25 mm, and in the center of the bolt 3 which is M10 in the embodiment. Bolt temporary fixing holes 7 are formed for close fitting so as to allow temporary fixing. Since the outer diameter of the threaded portion of the bolt of M10 is 10.000 mmφ and the diameter of the valley is 8.376 mmφ, the diameter of the bolt temporary fixing hole 5a is set to be between 8.376 mm to 10,000 mm. It is set to 8.5 mmφ.
The length of the notch 8 is appropriately set as described below so that when the temporary fixing washer 5 is bent, the inner diameter of the bolt temporary fixing hole 7 is 10 mm or more (10 mm in this embodiment). .

The extent to which the hole diameter of the bolt temporary fixing hole 7 corresponds to the length of the notch 8 when the temporary fixing washer 5 is bent will be described with reference to the schematic diagram of FIG.
A description will be given schematically by assuming that the bent state when the temporary washer 5 is used is a bent state as shown in FIG. That is, the outer side (BF) of the base end position B of the cut 8 is linear, and the bolt support portion 7b (D-B portion) extends linearly as an extension of the straight line. The direction outer portion (B-C portion) is schematically illustrated as being kept horizontal.
The distance from the base end B of the notch 8 to the inner edge D of the circular hole when the 8.5 mmφ circular hole is expanded to 10 mmφ by bending is defined as a, and the extension line of the bolt support portion 7b and the bolt temporarily fixed from the inner edge D The distance AD to the intersection A with the vertical line passing through the center of the hole 7 is defined as b.
△ ABC and △ ADE are similar,
b / (a + b) = 10 / (2a + 8.5)) (1)
If the bending angle is α,
b = 5 / cosα ...... (2)
Assuming that the angle α is 35 ° and a is calculated from the equations (1) and (2),
a = 4.15
It becomes.
That is, the length L of the notch 8 is
L = a + 4.25 = 4.15 + 4.25 = 8.4 mm
Then, when bent to an angle α = 35 °, the bolt fixing hole 7 of 8.5 mmφ widens to 10 mmφ.
The above calculation formula is based on a schematic bending state in which the bending state is not taken into consideration, and the length L of the obtained notch 8 is an approximate guideline, and is actually based on the actual bending state. Alternatively, the shape and dimensions of each part may be determined by trial production or the like.

A procedure for bolting the two corrugated U-shaped flumes 1 and 1 using the temporary fixing washer 5 will be described with reference to FIGS. 1, 4 to 6, 7 </ b> A, and 7 </ b> B.
The bolts of the corrugated U-shaped flumes 1 are connected with the downstream side of the bolt connecting portion facing down and the upstream side facing up. In FIGS. 1A and 1B, the left side is a downstream corrugated U-shaped flume and the right side is an upstream corrugated flume. 4, 5, 7 </ b> A, and 7 </ b> B, the corrugated U-shaped flume on the left side is the downstream side and the right side is the upstream side.
In addition, the bolt insertion hole portion (the portion of the bolt insertion hole 1c in the center in the width direction in the illustrated example) at the location in contact with the ground is first bolted and then the other location is bolted.
First, the corrugated U-shaped flume 1 on the downstream side is placed on the ground at the installation location, and as shown in FIG. 7A (A), the member width at the end portion 1f that is the peak portion p of the upstream end (upstream end). Insert a bolt 3 from the outside of the curve on the bottom side, that is, the soil foundation side (ground side), with the curved washer 2 interposed in the bolt insertion hole 1c in the center in the direction, and project the screw portion 3b upward (inside the curve). Let
Next, as shown in FIG. 7 (B '), the temporary washer 5 is held by one hand (for example, thumb and index finger or middle finger), and the temporary washer 5 is bent, as shown in FIG. 7A (B). The upper surface of the peak portion p of the downstream corrugated U-shaped flume 1 as shown in FIG. 7A (c). Lower until close to or touching.
Next, when the finger holding the temporary fixing washer 5 is released and the bending applied force is released, the temporary fixing washer 5 is restored to a flat state as shown in FIG. 7A (d). At this time, the inner edge of the bolt temporary fixing hole 7 is deeply inserted into the groove of the threaded portion 3b of the bolt 3, and the bolt 3 is inserted into the bolt temporary fixing hole 7 in a tightly fitted state. Hold in the hole position. Therefore, the bolt 3 is temporarily fixed to the bolt insertion hole 1c by the temporary fixing washer 5, and is kept upright without falling off.
In this state, as shown in FIG. 7B (e), the bolt insertion hole 1c of the end portion 1f of the upstream (right side) corrugated U-shaped flume 1 is connected to the end portion of the downstream (left side) corrugated U-shaped flume 1. The upstream corrugated U-shaped flume 1 is overlapped with the end portion 1f of the downstream corrugated U-shaped flume 1 so as to cover the bolt 3 that is temporarily fixed to the bolt insertion hole 1c of 1f and kept upright.
At this stage, the temporary fixing washer 5 made of resin is easily bent by the weight of the corrugated U-shaped flume and fits into the curved surface of the mountain p as shown in the figure, and the gap between the upper and lower corrugated U-shaped flume is about the thickness of the temporary fixing washer 5 Just do it.
Next, as shown in FIG. 7B (f), when the bolt 3 is covered with a curved washer 6 and the nut 4 is screwed and attached, the ends of the corrugated U-shaped flumes 1 and 1 at the center in the width direction are connected. Bolt connection is performed.

In the above description, the bolt 3 is inserted into the bolt insertion hole 1c in the upstream end portion 1f of the corrugated U-shaped flume 1 on the downstream side of the bolt connecting portion, and temporarily fixed with the temporary fixing washer 5 (FIG. ) To (d)), and an upstream end 1f of the corrugated U-shaped flume 1 on the upstream side thereof and a bolted connection with a nut 4 (FIG. 7B (e), (f) ), But a plurality of corrugated U-shaped flumes are prepared in advance by preparing preparation main body parts by temporarily fixing bolts by the operations of FIGS. 7A (A) to (D). The work efficiency is good when the preparation main body parts are constructed in the order of connecting them by the work shown in FIGS. 7B (e) and (f) in order from the downstream side of the flow path.
The temporary fixing washer of the present invention is flexible enough to be bent with, for example, a finger of one hand, and is usually worked by picking and bending with a finger of one hand even in actual work. It does not exclude the use of any equipment.

  In the bolt insertion holes 1d and 1e other than the bolt insertion hole 1c at the center in the width direction of the U-shaped groove 1a, a hand or a tool is put on the head 3a 'of the inserted bolt 3' as shown in FIG. Since it can be applied, the temporary fixing washer 5 is not required and the bolt can be connected by a normal operation.

Unlike the conventional steel temporary fixing washer 55 shown in FIG. 14, the temporary fixing washer 5 is bent with a finger of one hand, so that the bolt is hardly required. 3 can be easily inserted.
Further, when the finger force is loosened and returned to the original flat state, the inner edge of the bolt temporary fixing hole 7 is easily engaged with the groove of the threaded portion of the bolt 3 so that the temporary fixing washer 5 comes out of the bolt 3. There is no fear, and the bolt 3 can be firmly fixed temporarily.
Moreover, even when removing, since the bolt temporary fixing hole 7 is enlarged by bending with a finger, it can be easily removed from the bolt 3 with almost no force required.
Further, since the temporary fixing washer 5 can be picked up and operated with one hand, it is possible to perform some operation with the other free hand, and the workability is also good in this respect.
As described above, the bolt can be easily inserted into the bolt with little force, and can be engaged with the screw groove of the bolt, so that the bolt temporary fixing work is compared with the conventional steel temporary fixing washer 55. However, the work efficiency of the corrugated metal plate member itself is improved.

As described above, the temporary fixing washer of the present invention is inserted into the bolt by bending the bolt temporary fixing hole by bending, so that the inner diameter of the bolt temporary fixing hole is small enough to enter the depth of the screw groove of the bolt. The inner diameter can be set, and a necessary engaging force with respect to the bolt can be secured even if the plate thickness is reduced. Therefore, even when a steel material is used, the plate thickness can be reduced and the weight can be significantly reduced as compared with the conventional temporary fixing washer 55, and handling is easy.
Further, since there is no projection 55b like the conventional temporary fixing washer 55 of FIG. 14, it is easy to handle during storage and carrying, and it is not necessary to distinguish between the front and the back. There is no complication in checking the front and back.

When the temporary fixing washer is made of resin as in the embodiment, the elastic area is wider than that of steel, so when the temporary fixing washer 5 is deflected and the applied force is released and becomes flat, the inner edge of the hole is easily formed. It is elastically deformed and can easily enter the groove (screw valley) of the threaded portion of the bolt 3. Therefore, the inner diameter of the bolt fixing hole 7 is theoretically larger than the thread valley diameter of the bolt 3, but in consideration of the elastic deformation of the resin, it is actually strictly larger than the thread valley diameter. It does not have to be.
In addition, resin temporary fixing washers are manufactured by making molds and pressing them, just like steel ones. However, the required pressing load is significantly smaller than steel ones. Various aspects such as extremely low wear, long life, and simple flat plate with no protrusions, etc., which can significantly reduce the cost of molds, have high production efficiency, and have low material costs. The cost of the temporary washer can be reduced.

Corrugated metal plate members such as conventional corrugated U-shaped flume or corrugated pipe are made of steel, and stainless steel is not known, but it is required to be installed on the site where corrosion is a concern or to be installed over a long period of time. In this case, in order to ensure high corrosion resistance, it can be considered to be made of stainless steel.
In this case, if the conventional steel temporary fixing washer is used, rust is generated due to the potential difference between the dissimilar metal contacts in the temporary steel washer, and the appearance of the stainless corrugated metal plate member that has already been installed is adversely affected by the rust. However, when the resin temporary fixing washer 5 is used as in the embodiment, it does not rust and no rust juice is produced, so that the appearance is not impaired.

FIG. 10 shows a temporary fixing washer 15 of another embodiment.
In this temporary fixing washer 15, the opposed substantially arc-shaped recesses of the opposed bolt support portions 17b each have a narrow arc shape narrower than a semicircle, and the two narrow arc-shaped recesses 17a as a whole are spaced apart. Opposite to each other. The radius R of the narrow arc-shaped recess 17a is 4.25 mm (a half of 8.5 mm), and the interval between the opposing narrow arc-shaped recesses 17a is 8.5 mm. Moreover, the space | interval of the notch 18 of the both sides of the bolt support part 17b is 8.5 mm.
Inner edges 17c on both sides in the plate width direction of the bolt temporary fixing holes 17 are circular arcs having a diameter of 10 mm (radius R = 5 mm). Therefore, the inner dimension in the plate width direction of the intermediate portion of the two narrow arc-shaped recesses 17a is a dimension that does not particularly restrict the outer diameter (10 mm) of the threaded portion of the bolt 3. It may be slightly larger than 10 mm.
Accordingly, the temporary washer 15 can be easily inserted into the bolt 3 in a state where the temporary washer 15 is pinched with one finger and bent as in the case described with reference to FIGS. 7A and 7B. The bolt support portion 17b (its narrow arc-shaped concave portion 17a) is engaged with the thread groove of the bolt 3 by temporarily releasing the finger and returning to the flat state, so that the bolt 3 can be temporarily fixed. it can.
The narrow arc-shaped recess 17a does not have to be strictly an arc having a circular curvature, and may be a substantially arc having a slightly larger curvature than the circle.

A temporary fixing washer 15 ′ shown in FIG. 11A is a modification of the temporary fixing washer 15 shown in FIG. Unlike the temporary fixing washer 15 of FIG. 10, the temporary fixing washer 15 ′ has the positions of the notches 18 ′ on both sides of the bolt support portion 17b at the both ends of the narrow arc-shaped recess 17a, and the notches 18 ′ on both sides. Is slightly narrower than 8.5 mm.
Also in this case, the inner dimension in the plate width direction of the intermediate portion of the two narrow arc-shaped concave portions 17a is a size that does not particularly restrict the outer diameter (10 mm) of the screw portion of the bolt 3, and the same operation as described above. Thus, the bolt 3 can be temporarily fixed.

The temporary fixing washer 15 "shown in FIG. 11 (b) is also a modification of the temporary fixing washer 15 in FIG. 10. Unlike the temporary fixing washer 15 in FIG. The inner edge of the inner edge 17c ″ on both sides in the plate width direction of the hole 17 ″ is not a circular arc but a straight line, and the inner dimension between both the straight lines is 10 mm.
Also in this case, the inner dimension in the plate width direction of the intermediate portion of the two narrow arc-shaped concave portions 17a is a size that does not particularly restrict the outer diameter (10 mm) of the screw portion of the bolt 3, and the same operation as described above. Thus, the bolt 3 can be temporarily fixed.

12 (A) to 12 (E) show still another embodiment of the temporary fixing washer.
A temporary washer 25 shown in FIG. 12 (a) is a modification of the temporary fix washer 5 shown in FIG. 8, and has notches 28 formed on both sides of only one bolt support portion 27b of the bolt temporary fixing hole 27. It is. The other bolt support portion 27b ′ does not have cuts on both sides.
In this case, as shown in the figure, the position of the bolt temporary fixing hole 27 may be eccentric to one side of the washer plate 26 and the length of the cut 28 on the opposite side to the eccentric side may be increased.

A temporary washer 35 shown in FIG. 12 (b) is a modification of the temporary fix washer 15 shown in FIG. 10, in which notches 38 are formed on only one bolt support portion 37b of the bolt temporary fixing hole 37. It is. The other bolt support portion 37b ′ does not have cuts on both sides.
In this case, as described above, the position of the bolt temporary fixing hole 37 may be eccentric to one side of the washer plate 36, and the length of the notch 38 on the opposite side to the eccentric side may be increased.

  A temporary fixing washer 45 shown in FIG. 12C is a modification of the temporary fixing washer 5 shown in FIG. 8, and is simply obtained by eliminating the cut 8 on one side of the temporary fixing washer 5 shown in FIG. That is, the bolt temporary fixing hole 47 is in the center of the washer plate 46, and only one bolt support portion 47 b of the bolt temporary fixing hole 47 is formed with cuts 48 on both sides thereof. The other bolt support portion 47b ′ does not have cuts on both sides.

  The temporary fixing washer 55 in FIG. 12 (d) is also a modification of the temporary fixing washer 5 in FIG. 8, and uses an washer plate body 56 having an oval shape instead of an ellipse. The internal bolt temporary fixing hole 57, the bolt support portion 57b, and the notch 58 are the same as those of the temporary fixing washer 5 of FIG.

  The temporary fixing washer 65 in FIG. 12E is also a modification of the temporary fixing washer 5 in FIG. 8 and uses a washer plate body 66 having a rectangular outer shape rather than an ellipse. The internal bolt fixing holes 67, the bolt support portions 67b, and the notches 68 are the same as those of the temporary fixing washer 5 of FIG. The outer shape of the washer plate body 66 is not limited to the above-described ellipse, ellipse, and rectangle, but is arbitrary.

In the above-described embodiment, as shown in FIG. 3, the place (bolt 3) where the temporary washer is used is only one place in the central part of the member width direction, but the bottom part of the U-shaped groove part has a wide width. When it is necessary to connect the bolts at a plurality of locations in contact with the bolt, naturally, temporary fixing washers are used for the bolt connection portions at the plurality of locations.
Further, in the embodiment, the corrugated U-shaped flume 1 in which the U-shaped groove portion and the flange portions at both ends thereof are illustrated and described, but only the U-shaped groove shape portion in which the main body portion does not have a flange. The present invention can also be applied to a corrugated U-shaped flume having a cross-sectional shape, and can also be applied to a corrugated U-shaped flume having a U-shaped groove formed by bolting two to three parts. .
Of course, the present invention can also be applied to a corrugated pipe having a circular section by combining two semicircular corrugated metal plates, or a corrugated pipe having a circular section by connecting three or more arc-shaped corrugated metal plates.
In addition, the application is not limited to a water channel, and can be applied to, for example, a simple tunnel, a culvert under a road, and other applications.
In short, it is a corrugated metal plate member for civil engineering work, such as corrugated U-shaped flume and corrugated pipe curved in a direction orthogonal to the corrugated direction, and bolts on the part placed on the earth foundation (ground) It can be applied to various cases having a connecting portion.

1 Corrugated U-shaped flume (corrugated metal plate member)
DESCRIPTION OF SYMBOLS 1a U-shaped groove part 1b Flange part 1c Bolt penetration hole 1d (in the center part of the member width direction which touches the ground) 1e Bolt penetration hole 1f (It is a connection part of corrugated U-shaped flumes) End 2 Curved washer 3 Bolt 3a Bolt head 3b Threaded portion 4 Nut 5, 15, 25, 35, 45, 55, 65 Temporary fixing washer 6, 16, 26, 36, 46, 56, 66 Washer plate bodies 7, 17, 27, 37, 47, 57, 67 Bolt temporary fixing hole 7a Semicircular recess (substantially arc-shaped recess)
17a Narrow arc-shaped recess (substantially arc-shaped recess)
7b, 17b, 27b, 37b, 47b, 57b, 67b Bolt support portion 27b ', 37b', 47b '(No cut on both sides) Bolt support portion 8, 18, 28, 38, 48, 58, 68 Notch 9 Auxiliary Cut p (Viewed from the inside of the corrugated metal plate member) Peak q (Viewed from the inside of the corrugated metal plate member) Valley

Claims (7)

Two corrugated metal plate members obtained by corrugating corrugated metal plates curved in an arc shape or U-shape in a direction perpendicular to the corrugated direction are arranged on the soil foundation by overlapping each other. A corrugated metal plate member connecting structure in which parts of bolt insertion holes formed at positions facing the soil foundation of the parts are connected to each other by bolts,
The flexible washer plate has a substantially arc-shaped concave portion and a bolt temporary fixing hole formed by the opposed bolt support portions, and is formed in at least one of the opposed bolt support portions. On both sides of the plate body width direction, a temporary fixing washer formed in such a manner that a notch extending to the front of the washer outer end in a direction substantially orthogonal to the plate body width direction leads to the substantially arc-shaped recess,
The temporary fixing washer is bent in a curved shape by an additional bending force applied from both outer sides in a direction orthogonal to the plate body width direction, and the diameter of the bolt temporary fixing hole is set to the outer diameter of the screw portion of the bolt. In the expanded state, the bolt is inserted into the bolt until it approaches or comes into contact with the upper surface of the member, and the bolt is tightly fitted into the bolt temporary fixing hole by releasing the bending additional force and eliminating the bending. As a combined state, it is held at the bolt insertion hole position,
The bolt insertion hole at the end of the other corrugated metal plate member is passed through the bolt held at the bolt insertion hole position at the end of the one corrugated metal plate member, and a nut is screwed into the bolt. A corrugated metal plate member connecting structure, wherein both corrugated metal plate members are bolted to each other.   The substantially arcuate recesses of the opposing bolt support portions of the temporary washer that are opposed to each other form a semicircular shape, and the bolt temporary fixing holes as a whole are smaller than the thread diameter of the screw portion of the bolt and have a thread valley. The notch on both sides of the bolt temporary fixing hole communicates with the recess through an auxiliary notch extending in the plate width direction from the end of the semicircular recess. The corrugated metal plate member connection structure according to claim 1, wherein:   The substantially arc-shaped concave portions facing each other of the opposed bolt support portions in the temporary fixing washer each form a narrow arc shape narrower than a semicircle, and the two narrow arc-shaped concave portions as a whole are spaced apart from each other. And the two arcs form a part of a circular shape having an inner diameter smaller than the screw thread ridge diameter of the bolt and larger than the thread valley diameter, and a plate at the intermediate portion of the bolt temporary fixing hole. 2. The corrugated metal plate member connection structure according to claim 1, wherein the inner dimension in the body width direction is a dimension that does not constrain the outer diameter of the threaded portion of the bolt.   The corrugated metal plate according to any one of claims 1 to 3, wherein the notches on both sides of the bolt support portion of the temporary fixing washer are formed only on one of the opposing bolt support portions. Member connection structure.   The corrugated metal plate member according to any one of claims 1 to 3, wherein the notches on both sides of the bolt support portion in the temporary fixing washer are formed in both of the opposing bolt support portions. Connection structure. A temporary fixing washer for use in the connection structure of the corrugated metal plate member according to claim 1,
The flexible washer plate has a substantially arc-shaped concave portion and a bolt temporary fixing hole formed by the opposed bolt support portions, and is formed in at least one of the opposed bolt support portions. A temporary fixing washer characterized in that cuts extending in front of the washer outer end in a direction substantially orthogonal to the plate width direction are formed on both sides in the plate width direction so as to communicate with the substantially arc-shaped recess. . Two corrugated metal plate members obtained by corrugating corrugated metal plates curved in an arc shape or U-shape in a direction perpendicular to the corrugated direction are arranged on the soil foundation by overlapping each other. It is a connecting method of corrugated metal plate members in which parts of bolt insertion holes formed at positions facing the soil foundation of the parts are connected to each other by bolts,
The flexible washer plate body has a substantially arc-shaped concave portion and a bolt temporary fixing hole formed by an opposing bolt support portion, and is formed in at least one of the opposing bolt support portions. Using temporary fixing washers formed on both sides of the plate body width direction in a manner that leads to the front of the washer outer end in a direction substantially perpendicular to the plate body width direction, leading to the substantially arcuate recess,
The diameter of the bolt temporary fixing hole is made to be the outer diameter of the screw portion of the bolt by bending the temporary fixing washer in a curved shape with an additional bending force applied from both outer sides in a direction orthogonal to the plate body width direction. In the expanded state, insert the bolt until it approaches or contacts the upper surface of the member,
Next, by releasing the bending additional force and eliminating the bending, the bolt is held in the bolt insertion hole position as a state of being closely fitted to the bolt temporary fixing hole,
Next, the bolt insertion hole at the end of the other corrugated metal plate member is passed through the bolt held at the position of the bolt insertion hole at the end of the one corrugated metal plate member, and the nut is screwed into the bolt. A method for connecting corrugated metal plate members, wherein the corrugated metal plate members are connected to each other by bolts.

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