JPS6117641A - Coupler for assembled manhole unit and its formation - Google Patents

Abstract

PURPOSE:To eliminate the wasteness of operations by a method in which a washer with a bolt hole and a box-type tool to be drawn out after the hardening of concrete are coupled with each other and fixed in the concrete and a working space is formed in the inside of the manhole. CONSTITUTION:A washer metal 2 having a collar 5 formed by bending both ends of a flat plate after being bent into a recessed form and a box-shaped tool 3 are set together and holes 6 and 6' for fitting bolt are formed in them. A set of the washer 2 and the tool 3 is inserted into the recessed portion 8 of a manhole formwork ring 7, a burying nut 12 is set on the downside of the ring 7 and thrust with the fitting bolt 9, and ready-mixed concrete is placed. After the concrete hardens by curing, the bolt 9 is removed out, and the tool 3 is pulled out. Whereupon, both the collars 5 serve as anchors to the opening 11 and the bottom portion and the washer metal 2 becomes a coupler 20 in the buried fixed state. Sealants 14 are attached to uneven fitting portions 13 and 13' previously formed, and the bolt 9 is clamped by utilizing the opening 11 for connection and fixation. The clamping can thus be easily and completely attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure of a joint for connecting units of concrete members of an assembled manhole and a method of forming the joint.

[Conventional technology and its problems]

A manhole usually has a bottom plate A, <
The adjustment ring E and the manhole cover frame F are assembled upright to each unit of concrete members such as a body block B, a straight wall C2, and a slanted wall.

The joints that connect each concrete member are:
■A method in which a joint box with an opening on the joint surface of each unit is embedded in concrete and connected with tightening bolts, ■
A method is adopted in which an embedded nut is provided on the outer periphery of the joint surface of each unit, and a metal plate is bolted to this from the outer surface.

However, in the method (2), since the box-shaped hardware is embedded in the concrete member to form the joint opening, there is a problem that the manufacturing of the box-shaped hardware itself is laborious and expensive, making it uneconomical. In addition, compared to method (■), method (2) has the advantage that the joint itself is located on the outer periphery, making the work easier and the cost of materials less expensive. A work space must be provided for the work space, which creates a process loss in that additional work is required to create the work space and to refill it. Furthermore, since the joint portion is buried in the soil after assembly, there are problems such as severe corrosion and poor durability.

[Problem that the invention seeks to solve]

An object of the present invention is to perform the work from inside the manhole when connecting each prefabricated concrete member.

The object of the present invention is to provide a method for forming a joint that can be formed without any waste in operation.

[Means and operations for solving the problem] Hereinafter, an example in which the joint 20 of the present invention is formed on the joint surface of each concrete member in the assembled manhole shown in FIG.
The explanation will be based on the attached drawings.

FIG. 2 is a diagram showing the overall structure of members used to form the joint of the present invention. Referring to the figure, the joint forming tool 1 includes a metal washer 2 and a box-shaped jig 3 that is held together by the metal washer 2.
It consists of. The washer 2 forms a connecting part of concrete members, is used as a washer for a connecting bolt, and is made of a non-metallic material such as galvanized steel, stainless steel, or reinforced plastic from the viewpoint of corrosion resistance. As shown in the figure, the metal washer 2 is formed by bending a flat plate into a concave shape to form an upper open part 4, and both ends of the upper open part 4 further form a horizontally bent collar part 5, and the upper part It is configured to hold the box-shaped jig 3 in the open part 4. Further, the box-shaped jig 3 is for forming a joint space which will be described later.
After pouring concrete, the top and both sides are sloped to make it easy to pull out, creating a box-like shape that is slightly constricted in one direction. The metal washer 2 and the box-shaped jig 3 are provided with holes 6, 6'' through which bolts are inserted when the joint forming tool 1 is installed.

7 shows a manhole form ring forming the end of the form for pouring concrete material. Concave portions 8 are provided at multiple locations in contact with the inner periphery of the top surface of the manhole formwork, and bolts are inserted into the concave portions 8 for installation by setting embedded nuts 12. hole 6 for
, 6" are provided through the hole 6".

FIG. 3 is a diagram showing a state in which the joint forming tool 1 is set. As shown in the figure, the box-shaped jig 3 is fitted into the open upper part 4 of the metal washer 2 with the drawing direction facing outward.

The thus-combined joint forming tool 1 is placed in a plurality of recesses 8 provided on the upper surface of the manhole form ring 7. After setting the embedded round holes 2 on the lower surface of the formwork ring 7, the bolts 9 are inserted into the insertion holes 6.6" and 6" for installation.
After inserting and fixing the concrete, pour ready-mixed concrete into the formwork.

Next, after the concrete has cured and hardened, the bolts 9 are removed and only the box-shaped jig is removed. As shown in FIG. , a joint 2 in which both flanges 5 serve as anchors and a washer 2 is embedded and fixed in a concrete member.
o is formed. At this time, the metal embedded nut 12 is embedded in the concrete member 10'' to be joined and is used as a joint nut when assembling the manhole, so there is no need to remove it.

FIG. 5 is a diagram showing a state in which the concrete members 10 and 10'' placed one above the other are connected using the joint 2o formed as described above after the concrete members have been assembled upright. When assembling, the fitting opening convex surface 13. which is pre-formed at the end of the member at the time of concrete pouring.
A sealing material 14 is attached to 13' to completely shut off water due to the weight of each unit member. Then, by using the opening 11 opened on the inner surface of each unit member, the bolt 9 is passed through and protruded from the bolt insertion hole 6'' of the washer 2, and is tightened to the embedded nut 12, thereby connecting and fixing each concrete unit. This allows the concrete members to be completely bonded and prevent lateral slippage after construction.After the connection, joint mortar is embedded in the opening 11 and the joint space existing at the joint part, and the concrete members of the manhole are bonded together. Complete the assembly.

In the above embodiment, an example was shown in which a concrete member 10 having a joint 20 of the present invention is connected to a mating member 10° in which an embedded nut 12 is buried, but as shown in FIG. 20. Member 10 having 20'
．． Of course, it is also possible to abut the 10'' with the metal washers 2, 2'' and connect them using the connecting bolt 15.Furthermore,
As another aspect of this embodiment, it is also possible to connect by using means such as cutting a screw into the bolt insertion hole of the washer of the joint and screwing it in.

〔Effect of the invention〕

■ Just embed a simple-shaped washer, so
Manufacturing costs and material costs can be reduced.

■ The connecting surfaces are made of corrosion-resistant and shock-resistant steel or reinforced plastic, making the connecting work easy and reliable.

■ Embedded materials are buried in concrete and mortar and are not exposed in the soil, so there is less chance of corrosion.

■ Since the four walls of the joint opening are made of concrete, the adhesion of joint mortar, etc. is improved and the durability of the joint is improved.

■ Since the washer and embedded ring are attached to the partition ring of the concrete pouring frame at the same time, the number of partition rings of the formwork can be reduced, eliminating wasted concrete.

[Brief explanation of drawings]

Fig. 1 shows an assembled diagram of a manhole using the joint of the present invention, Fig. 2 shows the configuration of the joint forming tool used to form the joint of the present invention, and Fig. 3 shows the joint forming tool in a mold. Fig. 4 shows the structure of the joint formed after pouring concrete, and Fig. 5 shows the state of the concrete members connected using the formed joint. It is. FIG. 6 is a diagram showing another assembly mode using the joint of the present invention. 1: Joint forming tool 2: Metal washer 3: Box-shaped jig 4: Open top part 5: Flange part 6.6", 6": Bolt insertion hole 7: Manhole form ring 8: Recessed part 9: Installation Bolt 10.10'
, 10″: Concrete member 11: Opening
12: Embedded nut 13: Fitting uneven surface 14
: Sealing material 15: Connection bolt 20: Joint patent applicant Aso High Pressure Concrete Co., Ltd. (1 idiot)

Claims (1)

[Claims] 1. The lower surface on the inner peripheral side of the joint surface of the assembled manhole unit is
The work consists of a washer that has a hole for inserting an embedded nut in its upper surface and has flanges that spread outward at both upper ends, and the flanges of the washer are buried in concrete, and the upper part of the washer is surrounded by a concrete ground. A joint for an assembled manhole unit characterized by consisting of a space for use. 2. On the upper surface of the ring of the formwork for driving the assembled manhole unit, there is a washer with a bolt insertion hole on the bottom, an open upper part, and a flange with outwardly expanding sides, and the sides slope outward. After placing the joint forming tool that combines the box-shaped jig and inserting and fixing the mounting bolts through the bolt insertion holes, concrete is poured into the formwork, and after curing and hardening, only the box-shaped jig is pulled out and assembled. A method for forming a joint for an assembled manhole unit, comprising forming a joint space in which the washer is embedded and fixed in a concrete member on a joint surface along an inner peripheral surface of the manhole unit.