3-DOF Modular Joints

Introduction

Doshin Modular Expansion Joint System is a mechanical device installed in between bridge decks. Its main function is to allow for smooth vehicular movement across expansion joint openings. This is achieved by employing the use of lamella beams which divides the expansion joint openings into smaller individual gaps. The lamella beams are connected by EPDM rubber that acts as a watertight seal that prevents debris and water from passing through bridge expansion joints openings and damaging the bridge deck and structures below.

Advantages

Doshin Modular Expansion Joints cater for expansion joints with movement range exceeding 80 mm. The lamella beams work in series to accommodate the thermal expansion and contraction of bridge decks thus protecting it from damage.

The structural elements are made of superior and long lasting quality materials. All our products meet the stringent requirements of ISO 9001:2001 quality assurance requirements.

Doshin Modular Expansion Joints are highly durable, have no loose or moving steel parts thus totally eliminating it from damages due to frequent load changes. Lubricated PTFE, high-grade stainless steel, elastomeric components and plastics plays a part in enabling the movement of the Doshin Modular Expansion Joints.

Doshin Modular Expansion Joint

Doshin Modular Expansion Joint

Designation Of Types

Type & Size	Max. range of movement	Recess space			Joint width				Weight
	Max. range of movement	b1	b2	h	f0	f5	F65	F80	Weight
	mm	mm	mm	mm	mmm	mm	mm	mm	kg/m
3-DOF 1	80	200	200	150	130	135	195	210	100
3-DOF 2	160	400	300	400	140	150	270	300	155
3-DOF 3	240	480	300	400	220	235	415	460	235
3-DOF 4	320	560	300	400	300	320	560	620	335
3-DOF 5	400	640	300	420	380	405	705	780	415
3-DOF 6	480	720	300	420	460	490	850	940	515
3-DOF 7	560	800	300	420	540	575	995	1100	595
3-DOF 8	640	880	300	440	620	660	1140	1260	695
3-DOF 9	720	960	300	460	700	745	1285	1420	785
3-DOF 10	800	1040	300	480	780	830	1430	1580	895

CHARACTERISTICS

Movements

Doshin Modular Expansion Joints allow movement in all 3 directions (ux, uy, uz) and rotations about all 3 axes (f x, f y, f z). Large movements in the bridge’s transverse direction (uy) and vertical direction (uz) of both the lamella beams and the cross beams are made possible due to the consistent elasticity of the support system.

Principle Of Elasticity

Highly advanced spring and damping system is incorporated in the modular expansion joint design due to its ability to reduce dynamic stresses thus protecting the joints and structural elements from excessive damage due to traffic movement.

Movement Capacity

The maximum movement capacity in all 3 directions (ux, uy, uz) of Doshin Modular Expansion Joints, and the angle permitted between the movement direction and its joint axis, are presented in the table below.

Type	Number of gaps	Max. longitudinal movement	Max. transverse movement
		Max. longitudinal movement	Standard Design
		mm	mm
3-DOF 1	1	± 40	± 12
3-DOF 2	2	± 80	± 12
3-DOF 3	3	± 120	± 12
3-DOF 4	4	± 160	± 12
3-DOF 5	5	± 200	± 12
3-DOF 6	6	± 240	± 12
3-DOF 7	7	± 280	± 12
3-DOF 8	8	± 320	± 12
3-DOF 9	9	± 360	± 12
3-DOF 10	10	± 400	± 12