JP2001342675A - Connecting metal fixture for products such as separately manufactured culvert blocks and connecting method for products such as culvert blocks using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting metal fixture capable of shortening the time and saving the labor for the connecting work without requiring a skill and capable of connecting upper and lower blocks by its nearly 1/4 rotation by exerting shearing force resistance when connecting separately manufactured culvert blocks or culvert blocks having a retaining wall. SOLUTION: A lower coupling member 40A capable of accepting the lower half section of a joint pin 80 buried on the abutting face of the lower block 10 and an upper coupling member 40B capable of accepting the upper half section of the joint pin 80 buried on the abutting face of the upper block 20 are provided. The joint pin 80 protruded with angular rod-like coupling sections 84 perpendicularly to the shaft center at the upper and lower end sections of a shaft section 82 synchronously tapered at the upper and lower sections is inserted between the lower coupling member 40A and the upper coupling member 40B buried on the abutting faces of the upper and lower blocks 20 and 10 and is rotated nearly 1/4 rotation in the prescribed direction, thereby the lower block 10 and the upper block 20 are drawn and locked, shearing force resistance is exerted to connect them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION In order to simplify manufacturing molds and equipment and reduce production costs, a central part where the stress distribution (bending moment) due to the load applied to the upper part of the product becomes substantially zero is divided vertically. The present invention relates to a metal fitting for a product such as a small-sized culvert block or a culvert block with a retaining wall manufactured by the above method and a joining method using the same.

[0002]

2. Description of the Related Art FIG. 8 is an explanatory view showing a prior art 1 used for joining an underdrain block BX or the like manufactured by dividing into upper and lower parts in order to improve production efficiency. A required number of rebars D1 and D2 are projected into recesses 11 and 21 at the connection end of the block 10 and the upper block 20, and the lower block 10 and the upper block 20 are brought into contact with each other and both rebars D1 and D2 are concreted by the Japan Society of Civil Engineers. It is joined by the single-layer vertical upward welding method shown in the standard specifications (construction) and the guideline for enclosure welding of steel bars (draft). This welding method, which is shown in detail in the lower right part of the figure, is characterized in that a plurality of rebars D1 and D2 protruding from both ends of the block are surrounded by copper pads f and r divided into a front side and a back side. The lower block 10 and the upper block 20 are joined and integrated by welding in an atmosphere.

[0003] However, it is impossible to draw together the contact surfaces to be connected, and the welding work in the narrow recesses 11 and 21 is complicated, requires a qualified person and a welder, and is affected by wind. However, there is a drawback that the carbon dioxide gas co flies and the quality of the welded part is deteriorated.

FIG. 9 is an explanatory view showing a prior art 2 which is frequently used for joining a divided culvert block or a culvert block with a retaining wall, etc. in which a lower block 10 and an upper block 20 are joined. A required number of inserts “in” are buried outside the ends, and the inserts “i” of the two blocks that abut on each other.
The connection plate p is joined and integrated between n by a method of tightening with a bolt bo.

However, as in the former case, it is impossible to draw together the connecting surfaces to be connected, and the method of tightening the connection plate p between the inserts in with the bolts bo makes the connection work complicated and the exposed connection plate or the like is difficult. There are disadvantages such as the problem of corrosion prevention of metal and the reduction of the shearing resistance of the connecting portion as compared with the former.

[0006]

In order to eliminate the drawbacks of the prior art and to improve the production efficiency, when connecting the lower block and the upper block, such as a culvert block manufactured by dividing into upper and lower parts, the lower block and the upper block are joined together. A joint pin is inserted between the lower and upper engaging members embedded in the block in advance, and the lower and upper blocks are locked by a simple rotation operation of the joint pin, and they can be joined by exhibiting shear resistance. An object of the present invention is to provide a joining metal fitting for a product, such as a culvert block, which is manufactured by division, and a method for joining the product, such as a culvert block, which can be labor-saving using the metal fitting.

[0007]

A lower part of a joint pin is buried in advance in a contact surface of a lower block to be joined with a joint fitting for joining a contact portion of a product such as a culvert block manufactured by being divided into upper and lower parts. A lower engagement member capable of receiving and restraining the portion,
An upper engaging member that is embedded in advance in the contact surface of the upper block to be joined and that can receive and restrain the upper half of the joint pin, and an upper and lower end portion of a vertically symmetric tapered shaft portion having shear resistance. It consists of a joint pin with a square bar-shaped engaging part projecting perpendicular to the axis, and the upper engaging member and the lower engaging member are embedded in the contact surfaces of the two products to be joined, respectively. By inserting a joint pin between the members and rotating the joint pin approximately １ ／ on the axis, the upper and lower engaging portions of the joint pin are engaged with the upper engaging member and the lower engaging member, thereby forming the lower block. And pull the upper block (press)
A joint fitting that can be joined by restraining and exhibiting shear resistance.

Further, in order to absorb a shaft center error when the lower engaging member and the upper engaging member are buried, the joint pin has a tapered (mortar-shaped) engagement that can move a predetermined dimension in a direction orthogonal to the axis. A mating hole is opened at one end, and a jaw portion is formed between the inner periphery of the space portion bulging outward by communicating with the end of the engaging hole so that the engaging portion of the joint pin can be locked. A lower engaging member and an upper engaging member in which a plurality of introduction grooves are formed in which the engaging portion of the joint pin can be loosely inserted into the space portion and a second anchoring portion is provided at the other end to prevent slipping out. To

[0009] Further, a downward slope is formed in the jaw between the end of the engagement hole of the lower engagement member and the inner periphery of the space in the rotation direction,
The jaw at the end of the engagement hole of the upper engagement member is a jaw formed on a slope opposite to the jaw of the lower engagement member.

The jaw between the end of the engagement hole of the lower engagement member and the upper engagement member and the inner periphery of the space is formed on a slope having a shape that is inverted in the direction of rotation (downward halfway up and uphill). , The lower engaging member and the upper engaging member can be shared.

Further, the lower engaging member and the upper engaging member are replaced by a lower engaging member and an upper engaging member having a tool insertion portion which is opened at one side of the contact surface by 60 ° to 120 °. When the upper block and the lower block are in contact with each other, the tool insertion portion appears in a recess on one side (outer surface of the product) of the contact surface between the lower engagement member and the upper engagement member, and Insert the tool from the outside to make the joint pin rotatable.

[0012] In addition, the joint pin inserted between the lower engaging member and the upper engaging member by forming opposite slopes on the upper and lower engaging portions of the joint pin in opposite directions toward the center in the longitudinal direction. By rotating in a predetermined direction and tightening, the lower block and the upper block are attracted to each other, the contact surfaces are pressed against each other and locked, and the shear resistance is improved.

The joint pin is a joint pin having a tool engaging portion (tool insertion hole, tool engaging hole, etc.) at an intermediate portion in the vertical direction, and the joint pin is rotated by the tool from the tool insertion portion. Then, a hardening material is filled through the tool engagement portion to fix the engagement position (to prevent loosening) and to prevent corrosion of the joint fitting.

Further, the joint pin is a joint pin having a hollow portion opened at the upper and lower ends of the shaft portion, so that the material can be saved and lightened, the engagement position can be fixed (preventing loosening), and the corrosion of the joint metal can be prevented. A filling passage for the hardening material to be measured (via a tool engaging portion).

Further, a method of joining products such as a culvert block manufactured by being divided into upper and lower parts is described by first embedding a plurality of lower engaging members capable of receiving and restraining a lower half of a joint pin in a contact surface. Then, a lower block manufactured by installing the lower block, and then a plurality of joint pins projecting from the upper and lower end portions of the vertically symmetric tapered shaft portion orthogonally to the axis and a square rod-shaped engaging portion, An upper block manufactured by inserting and aligning with the introduction groove of the lower engagement member, and then embedding a plurality of upper engagement members capable of receiving and restraining the upper half of the joint pin in the contact surface. Is suspended on the joint pin, the joint pin is inserted in alignment with the upper engaging member, and the joint pin inserted between the lower engaging member and the upper engaging member is substantially
When rotated, the upper and lower engaging portions of the joint pin engage with the jaws of both engaging members, and as the rotation progresses, the contact surfaces of the lower block and the upper block are pulled (pressed) and locked, thereby preventing shearing. A method of joining products, such as divided culvert blocks, which can be joined in a few seconds without any need for skilled personnel by exerting force.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment] FIG. 1 is a schematic explanatory view of a joint fitting of the present invention, and FIG. 2 is a view showing a lower engaging member of Embodiment 1 of the present invention. Plan view, (b) is a front view,
FIG. 3 is a diagram illustrating a lower engagement member according to the first embodiment of the present invention.
(C) is a left side view, (d) is a cross-sectional view taken along line AA of FIG. 2,
(E) is a cross-sectional view taken along the line BB of FIG. 2, FIG. 4 is an explanatory view of an engagement state of the first embodiment of the present invention, and a development view of a jaw of a lower engagement member.
FIG. 5 is a three-view drawing of the joint pin according to the first embodiment of the present invention;
FIG. 6 is a perspective view of the joint pin according to the first embodiment of the present invention,
FIG. 7 is a diagram illustrating a lower engagement member according to the second embodiment of the present invention.
(A) is a plan view, (b) is a sectional view taken along line AA of (a),
(C) is a BB cross-sectional view of (a). Hereinafter, FIGS.
With reference to FIG. 7, a description will be given of a joint fitting of the present invention and a joining method using the same.

An outline of the present invention will be described with reference to FIG.
This figure shows the lower block 10 and the upper block 20 of the culvert block manufactured by being divided into upper and lower parts before joining, and the contact surfaces 10a and 20b of the lower block 10 and the upper block 20.
The lower engaging member 40A and the upper engaging member 40B are embedded in advance so that the upper surface of the flange 41 and the tool insertion portion 50 are exposed, and a vertically symmetric tapered shape is provided between the blocks 10 and 20 to join them. The joint pin 80 is formed by projecting an engagement portion 84 at the upper and lower ends of the shaft portion 82 and penetrating a tool insertion hole 88.

At the time of joining the two blocks 10 and 20, first, the joint pin 80 is inserted by aligning the engaging portion 84 protruding into the introduction groove 44 of the lower engaging member 40A of the lower block 10, and the upper block 20 is placed thereon. Is lowered, the joint pin 80 is inserted into the upper engagement member 40B in alignment, and when the lower portion is further lowered, the end surfaces (contact surfaces) 1 of the blocks 10 and 20 are removed.
0a and 20b contact. Next, when a tool is inserted into the tool insertion hole 88 from the tool insertion portion 50 and the joint pin 80 is rotated by approximately 1/4 clockwise R, the upper and lower engagement portions 84 are moved to the jaws 46 of the upper and lower engagement members 40B and 40A. (Described later in detail), and the blocks 10 and 20 are pulled together to exhibit shear resistance and are joined.

FIG. 2 shows (a) a plan view and (b) a side view of the lower engaging member 40A.
An anchoring portion 43 for preventing slipping out is protruded at the lower end, a tapered engaging hole 42 is opened at the center of the upper end, and the engaging portion 84 of the joint pin 80 is inserted vertically from the outer edge of the engaging hole 42. A hole 48 having the same diameter as the opening of the engaging hole 42 is formed by swelling outward from the terminal end 42 e of the engaging hole 42, and a space is formed from the terminal end 42 e of the engaging hole 42. Part 48
A jaw 46 is formed between the inner circumferences, and one side of the flange 41 is
The tool insertion portion 50 is provided with a cutout of 0 ° to 120 °.

FIG. 3 shows (c) a left side view of the lower engaging member 40A, and a sectional view taken along the line AA and BB of FIG. 2, and FIG. The notch of the portion 50 is used to insert a round bar-shaped tool (for rotating a joint pin) when the lower engagement member 40A and the upper engagement member 40B are in contact with each other to form a space capable of rotating by a required angle. belongs to.

The jaw 46 formed between the terminal end 42e of the engaging hole 42 and the inner periphery of the space 48 is provided with a rotation direction R (rightward rotation in the figure) indicated by an arrow in the sectional view taken along the line A--A in FIG. ), A gradient 46 s is formed to descend to the right, and (e) there is a height difference between the left and right (the outlet and the inlet of the jaw 46) of the introduction groove 44 shown in the BB sectional view, and the engaged joint pin 80 is engaged. Of the lower engagement member 40A and the upper engagement member 4 (not shown)
OB (the jaw 46 has a reverse slope) is drawn toward each other, and the lower block 10 and the upper block 20 in which the lower engagement member 40A and the upper engagement member 40B are embedded are pressed and joined. The lower engaging member 40A (upper engaging member 40B)
Is magnetically attached to a mounting tool (not shown) with magnetism and set on the formwork, or the mounting tool is screwed using a screw hole ks shown at the bottom of the figure to set the mold with a small axis center error. .

FIG. 4 is an explanatory view showing an engaged state of the first embodiment of the present invention and a developed view of a jaw portion of the engaging member. FIG. In the initial state where the joint pin 80 is inserted, the joint pin 80 is
It is shown cut at four positions. Reference numeral pk1 is an introduction groove 44 at a 0 ° position, and pk2 is an introduction groove 44 at a 180 ° position. The engagement hole 42 end portion 42e excluding the two introduction grooves 44 which are vertically formed in the tapered engagement hole 42. Is the jaw 46, and the arrow R is the direction of rotation of the engaging portion 84.

FIG. 4B shows the insertion groove 44 and the jaw 46 of the lower engagement member 40A developed between 0 ° and 180 °, and the joint pin 80 shows only the engagement portion 84 at the initial insertion position. I have. When the joint pin 80 inserted into the introduction groove 44 is rotated clockwise R, the slope 86 of the engaging portion 84 becomes the slope 4 of the jaw 46.
6s, while rotating in the 90 ° direction from the pk1 (0 °) position while being in sliding contact with the lower engagement member 40A and the upper engagement member 40B.
Are attracted to each other, and the upper and lower blocks 10, 20 are pressed and joined.

The configuration of the lower engaging member 40A has been described above. However, the pair of upper engaging members 40B (not shown) is the same as the pair of upper engaging members 40B except that the direction of the gradient 46s of the jaw 46 is reversed. It is the same as the lower engagement member 40A.

FIGS. 5A and 5B are three views of the joint pin 80 of the joint fitting of the present invention. FIG. 5A is a plan view, FIG. 5B is a left side view, FIG. 5C is a front view, and FIG. It is a perspective view of the joint pin 80 of a joining metal fitting. Hereinafter, the joint pin 80 will be described with reference to both drawings. The joint pin 80 protrudes an engagement portion 84 from a vertically symmetric tapered shaft portion 82 having shear resistance and upper and lower end portions 80t and 80b, and a right-inclined slope 86 (inside the lower engagement portion 84). (See left side view)
Inside the upper engaging portion 84, a slope 86 descending rightward
(See the left side view), penetrates the tool insertion hole 88 as a tool engagement part in the largest diameter part in the middle of the shaft part 82, and cuts corners of the ends of the upper and lower engagement parts 84 to facilitate insertion. To form a joint pin 80. The tool engaging portion (tool insertion hole 88) may be provided with several concave holes for rotating by tapping.

The fitting of the joint pin and the engagement hole 42 of the lower engagement member (upper engagement member) described above provides a gap of several millimeters, and a plurality of lower engagement members (upper engagement member) are manufactured. It is also possible to absorb a shaft center error when embedded in (upper and lower blocks). It is preferable that the joint pin 80 is fixed (prevented from loosening) by filling a hardening agent such as a resin mortar / epoxy adhesive from the tool insertion portion 50 after the product is joined.

FIG. 7 shows a lower engaging member according to a second embodiment of the present invention.
(A) is a plan view, (b) is a diagram of FIG.
A sectional view, (c) is a BB sectional view of the figure (a). The lower engagement member 40C has a tapered engagement hole 4 in the center of the upper end.
2, and an introduction groove 44 into which the engaging portion 84 of the joint pin 80 can be inserted vertically from the outer edge of the engaging hole 42 is formed.
The engaging hole 4 is bulged outward from the terminal end 42 e of the engaging hole 42 to
A space 48 having the same diameter as the two openings is formed, a jaw 46 is formed between the end 42e of the engagement hole 42 and the inner periphery of the space 48, and one side of the upper end is approximately 65 ° (limited to this angle). The tool insertion part 50 is provided by notching, and the engagement hole 42 is formed.
Screw holes ks for screwing the mounting tool into the bottom and setting it on the formwork
The anchoring portion 43b extends from the main body 40 in order to increase the adhesive force to the concrete and the frictional resistance.

(C) The notch of the tool insertion portion 50 at the upper right in the figure is a round bar-shaped tool (for rotating a joint pin) when the lower engagement member 40C and the upper engagement member 40D (not shown) abut. ) To form a space that can be rotated by a required angle.

The jaw 46 formed between the terminal end 42e of the engaging hole 42 and the inner periphery of the space 48 is rotated in the rotation direction R (rightward in FIG. ) Is formed to the right and downward, and (c) there is a difference in height between the left and right (the outlet and the inlet of the jaw 46) of the introduction groove 44 shown in the BB sectional view, and the engaged joint pin 80 is engaged. Of the lower engagement member 40C and the upper engagement member 4 (not shown)
0D (the gradient 46s of the jaw 46 is a reverse gradient), the lower engagement member 40C and the upper engagement member 4
The lower block 10 and the upper block 20 in which 0D is embedded are pressed and joined.

The configuration of the lower engaging member 40C has been described above. However, the pair of upper engaging members 40D (not shown) is the same as the pair of upper engaging members 40D except that the direction of the gradient 46s of the jaw 46 is reversed. It is the same as the lower engagement member 40C.

Further, if the jaw between the end of the engagement hole of the lower engagement member and the upper engagement member and the inner periphery of the space is formed as a jaw having a slope shaped like a letter that is inverted in the direction of rotation, The side engaging member and the upper engaging member can have a common configuration, and can be engaged by rotating in any of the left and right directions.

Although not shown in the drawings, the slope of the engaging portion 84 of the joint pin may be flat with rounded corners, and the jaw 46 of the upper and lower engaging members may be formed flat without slope. The upper and lower blocks 10 and 20 can be locked, the lower engagement member and the upper engagement member can have a common configuration, and can be engaged by rotating in any direction.

Although not shown in the drawings, if a joint pin having a hollow part opened at the upper and lower ends of the shaft part of the joint pin is formed, the weight of the joint fitting can be reduced, and the engaging position is fixed (preventing loosening). For filling the hardening material (via the tool engaging portion).

The joining method of the present invention will be described with reference to FIG. This figure shows a state before the joint of the lower block 10 and the upper block 20 that are manufactured by dividing the culvert block into upper and lower parts. A plurality of side engagement members 40A and upper engagement members 40B are embedded in advance, and a joint pin 80 formed by projecting engagement portions 84 at upper and lower ends of a vertically symmetric tapered shaft portion 82 that joins the two is formed by: Lower engaging member 40
A shows an inserted state.

At the time of joining the two blocks 10 and 20, first, the joint pin 80 is inserted into the introduction groove 44 of the lower engagement member 40 A of the lower block 10 by aligning the protruding engagement portion 84 with the joint pin 80. When the upper block 20 is hung down, the engaging portion 44 of the joint pin 40 is inserted in alignment with the introduction groove of the upper engagement member 40B, and when it is further lowered, the abutting surface (product end) abuts. When the joint pin 80 is rotated about 1/4 turn from the outside of the contact surface by a tool, the upper and lower engaging portions 84 of the joint pin 80 are
The upper and lower blocks 20 and 10 are attracted to each other if they are further rotated and locked to the jaws 46 of A and 40B, exhibit shearing resistance, and can be joined in a few seconds per location.
The time required for the joining operation can be reduced and labor can be saved without requiring a skilled person.

[0036]

If the joint fitting of the present invention is applied to products such as culvert blocks and culvert blocks with retaining walls, which are manufactured by division, simplification of the form by the division, reduction of manufacturing equipment costs, and transportation equipment In addition to economic effects such as weight reduction of heavy construction equipment, the lower engagement member 40A on the lower block 10 side and the upper block 20
By inserting the joint pin 80 between the upper engagement members 40B on the side and rotating it by only about 1/4 turn, the upper and lower blocks exhibit shear resistance and can be joined at the construction site in a short time,
Filling the hardening material through the tool engaging portion has effects such as fixing the engaging position (preventing loosening) and preventing corrosion of the joint fitting.

The joining method using the joining fitting of the present invention is as follows.
If the present invention is applied to the joining of products such as culvert blocks and culvert blocks with retaining walls, the upper and lower blocks 20 and 10 are attracted to each other and exhibit shearing resistance, and can be joined in a few seconds per location. There is an effect that the time for joining work can be shortened and labor saving can be achieved without the need for any work.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a joint fitting of the present invention.

FIGS. 2A and 2B are views showing a lower engaging member according to the first embodiment of the present invention, wherein FIG. 2A is a plan view and FIG.

3A and 3B are diagrams showing a lower engaging member according to the first embodiment of the present invention, wherein FIG. 3C is a left side view, FIG. 3D is a cross-sectional view taken along the line AA of FIG. FIG. 3 is a sectional view taken along line BB of FIG. 2.

FIG. 4 is an explanatory diagram of an engaged state and a developed view of a jaw of a lower engaging member according to the first embodiment of the present invention.

FIG. 5 is a three-view drawing of the joint pin according to the first embodiment of the present invention.

FIG. 6 is a perspective view of the joint pin according to the first embodiment of the present invention.

FIGS. 7A and 7B are diagrams showing a lower engaging member according to the second embodiment of the present invention, wherein FIG. 7A is a plan view, FIG. 7B is a sectional view taken along line AA of FIG. a) It is BB sectional drawing of a figure.

FIG. 8 is an explanatory diagram of Conventional Technique 1.

FIG. 9 is an explanatory diagram of Conventional Technique 2.

[Explanation of symbols]

 10-lower block 20-upper block 40A-lower engaging member of Example 1 40B-upper engaging member of Example 1 40C-lower engaging member of Example 2 40D-upper engaging member of Example 2 41-flange 42-engaging hole 43-anchor 44-introduction groove 46-jaw 46s-slope (of jaw) 48-space 50-tool insertion part 80-joint pin 82-shaft (tapered 84-engaging portion 86-slope (inside the engaging portion) 88-tool insertion hole

Claims (9)

[Claims] 1. A joining metal fitting for a product such as an underdrain block manufactured by being divided into upper and lower parts, the lower part being capable of receiving and restraining a lower half of a joint pin embedded in a contact surface of a lower block to be joined. An engagement member, an upper engagement member embedded in a contact surface of an upper block to be joined and capable of receiving and restraining an upper half portion of a joint pin; and an axial center at upper and lower ends of a vertically symmetric tapered shaft portion And a joint pin projecting from a rectangular rod-shaped engaging portion orthogonal to the upper and lower engaging members embedded in the contact surfaces of the upper and lower blocks. The lower and upper blocks are attracted by being rotated about 1/4 in the direction to exert a shearing force so that they can be joined to each other. 2. A space in which a lower engaging member and an upper engaging member communicate with a tapered engaging hole into which a joint pin opened at one end is freely fittable and an end of the engaging hole, and bulge outward. A jaw portion on which the engaging portion can be locked is formed between the inner circumferences of the portions, and a plurality of introducing grooves are formed vertically from the outer edge of the engaging hole so that the engaging portion of the joint pin can be loosely inserted into the space portion. A lower engaging member and an upper engaging member, each of which has an anchoring portion for enhancing an anchoring force at an end thereof, and are joined by absorbing an axis error when the lower engaging member and the upper engaging member are embedded. The joint fitting for a product such as a culvert block manufactured by division according to claim 1, which is made possible. 3. The jaw between the end of the engagement hole of the lower engagement member and the inner periphery of the space is a jaw having a downwardly sloped surface in the rotational direction. 3. The joint of a divided culvert block or the like manufactured by dividing according to claim 2, wherein the jaw between the inner circumferences is a jaw having a slope opposite to the jaw of the lower engaging member. Metal fittings. 4. A lower engaging member, wherein a lower surface of the lower engaging member is formed by forming a slope in a shape of a letter that is inverted in the rotation direction on a jaw between the end of the engaging hole of the lower engaging member and the upper engaging member and the outer periphery of the space. 4. An apparatus according to claim 2, wherein the upper and lower engaging members can be combined.
A metal fitting for a product such as a culvert block manufactured by dividing according to the above item. 5. The lower engaging member and the upper engaging member, wherein the lower engaging member and the upper engaging member are a lower engaging member and an upper engaging member provided with a tool insertion portion for rotating a joint pin on one side of an abutting surface. 5. A joint fitting for a product such as a culvert block manufactured by division according to any one of claims 1 to 4. 6. The divided culvert according to any one of claims 1 to 5, wherein the upper and lower engaging portions of the joint pin are engaging portions having upside-down inclined surfaces inside. Metal fittings for products such as blocks. 7. The divided culvert block or the like according to claim 1, wherein the joint pin is a joint pin having a tool engaging portion at an intermediate portion in a vertical direction. Product fittings. 8. The divided culvert block or the like according to claim 1, wherein the joint pin is a joint pin having a hollow portion opened at upper and lower ends of a shaft portion. Product fittings. 9. A method of joining products such as a culvert block manufactured by being divided into upper and lower parts, wherein a plurality of lower engaging members capable of receiving and restraining a lower half of a joint pin are provided. Then, a lower block manufactured by burying and manufacturing is installed.Next, a plurality of joint pins having a vertically symmetric tapered shaft portion and upper and lower end portions projecting with square bar-shaped engaging portions orthogonal to the axis are attached to the lower block. The upper block manufactured by inserting the upper half of the joint pin into the lower engaging member, and then burying a plurality of upper engaging members capable of receiving and restraining the upper half of the joint pin in the contact surface is referred to as a joint pin. Next, the contact surface between the lower block and the upper block is drawn by tightening the joint pin inserted between the lower engaging member and the upper engaging member by approximately 1/4 turn in a predetermined direction. Splitting characterized by exhibiting shear resistance and joining Bonding method underdrain blocks such products manufactured.