Bomvrij militair object, Betonnen werken Muiden-Muiderberg Muiderberg (Gooise meren 27)

English translation

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Description

Cluster 2. Tank barrier with Tetrahedra.

NEW HOLLAND WATER LINE

Introduction

TETRAHEDRA AND REMNANT OF TANK BARRIER to close off an access. Tetrahedra are pointed reinforced concrete blocks with four equal surfaces. They are intended as part of a tank barrier and more generally as a moveable road barrier. In some cases they were also made of steel and then consisted of diagonally interconnected (profiled) rods or railway rails. Tetrahedra are usually placed in groups. In the complex Concrete Works Muiden-Muiderberg, apart from as a component of the tank barrier on the IJsselmeerdijk, a number of tetrahedra also remain which belonged to a tank barrier near machine-gun casemate Hakkelaarsbrug-South. Tank barriers were intended to prevent armoured or other vehicles from passing through. They were constructed during the mobilisation period 1939-1940. They consist of a number of steel posts (railway rails or profiled steel beams), mostly pointed, driven diagonally forwards into the ground or concrete. Because of this form they are also called 'asparagus barriers'. These quickly deployable barriers are difficult to remove once installed. The barrier in the country lane De Goog, directly south of the T-junction with the Meerkade, can only be recognised in the verges because the road surface at this location has been provided with asphalt.

Description

Three clearly visible TETRAHEDRA which formed part of a tank barrier near the V.I.S. machine-gun casemate Hakkelaarsbrug-South. The tetrahedra lie at the corner of the country lane De Goog, in the south-eastern corner of the T-junction with the Meerdijk. They are the remnant of a road barrier from the mobilisation period 1939-1940. The tetrahedra are moveable, pointed concrete blocks with four equal surfaces, with or without an eye for hoisting and for connecting by means of chains into a continuous barrier. REMNANT OF TANK BARRIER consisting of one lying directly south of the T-junction of the country lane De Goog and the Meerdijk and consisting of a reinforced concrete structure in which profiled steel beams could be placed. The tank barrier is visible in the road verge and is further located beneath the current road surface.

Valuation

The TETRAHEDRA AND REMNANT OF TANK BARRIER at the V.I.S. machine-gun casemate Hakkelaarsbrug-South are of general importance because of:

* Cultural-historical values as part of the New Holland Water Line as designed by C.R.T. Kraijenhoff and initially constructed from 1815 by him, Jan Blanken and Major-engineer Willem Offerhaus and subsequently strengthened and improved by others for approximately 125 years.

* Architectural-historical values in particular as an expression of military-strategic engineering, which is based on: a. the system of inundation and access defence (19th and 20th centuries), b. the race with increasingly powerful offensive means (20th century) c. the system of 'living' field fortification in depth (20th century)

The component is an example of a tank barrier from 1939-1940, combined with clearly recognizable reinforced concrete tetrahedra.

* Ensemble value and situational values as part of the New Holland Water Line. Also because of the functional and physical coherence with the other components of the complex.

* The component is fairly rare because relatively few tetrahedra in situ at tank barriers have been preserved.

* The component is fairly well-preserved and, particularly as regards the tetrahedra, can still be recognized well in the field in its original function.