IMER – Gerris 800 Gas Powered Crawler Concrete Placement Boom – 1128758 is a self‑propelled, remote‑controlled tracked placing boom designed to distribute pumped concrete quickly and accurately in areas where traditional truck booms and cranes can’t reach. With a compact 2' 7" transport width, 16' 1" transport length, 26 ft reach, and up to 37 ft max height, it turns any pump with 4" HD fittings into a highly maneuverable placing system.

Overview: IMER Gerris 800 Gas Powered Crawler Concrete Placement Boom – 1128758

The IMER Gerris 800 is a crawler concrete placing boom built to move under its own power on rubber tracks and place pumped concrete anywhere within its 26 ft radius and 37 ft height envelope. It is radio‑controlled, so the operator can walk with the machine and position the boom precisely while staying safely out of the pour area.

Model 1128758 is the gas powered version, featuring a Honda GX390 13 HP gas engine plus a 1.5 HP 120V auxiliary electric motor (Bi‑Energy) for indoor or low‑emission environments. This dual power setup lets you run on gasoline outdoors and switch to 120V electric for enclosed spaces where exhaust and noise must be minimized.

Key Specifications: IMER Gerris 800 – 1128758

From IMER USA’s Gerris 800 product page and spec sheet:

• Model: Gerris 800 Crawler Concrete Placing Boom

• Model number (Gas): 1128758

• Power:

  • Main engine: 13 HP Honda GX390 gas engine

  • Auxiliary motor: 1.5 HP 120V electric motor (Bi‑Energy)

• Max height served: 37 ft (approx. 11.2 m)

• Max reach (horizontal outreach): 26 ft 3 in (approx. 8 m)

• Max depth of casting reachable: about 16.5 ft (approx. 5 m) including terminal rubber hose

• Maximum aggregate size: 1 in (25 mm)

• Turret rotation: 355° range of action

• Max travel speed: 1.6 mph (approx. 2.5 km/h)

• Gradeability: 25% slope

• Stabilized footprint (outriggers deployed): approx. 9' 7" × 10' 1" (about 3.1 × 3.26 m)

• Transport dimensions (tracks retracted):

  • Width: 2' 7" (800 mm)

  • Length: 16' 1" (about 4,930 mm)

  • Height: 6' 6"

• Weight: approx. 5,512 lb (about 2,500 kg)

• Piping: DN 100 (4") boom piping with removable header pipe and 3 m DN 100 (4") rubber terminal hose

These specs make the IMER – Gerris 800 Gas Powered Crawler Concrete Placement Boom – 1128758 a compact yet capable machine for placing pumped concrete with up to 1 in aggregate in complex environments.

Self-Propelled Crawler Chassis and Mobility

The Gerris 800 is built on a heavy‑duty tracked undercarriage to handle rough terrain and tight access.

Mobility features include:

• Rubber tracks hydraulically expandable from about 31 in (787 mm) to 41 in (1050 mm), giving a narrow transport width and wider working stance for stability.

• Double‑speed traction motors for slow precise maneuvering and faster travel up to 1.6 mph.

• 25% gradeability, allowing the machine to climb moderate slopes and ramps on job sites.

The small footprint (2' 7" × 16' 1" in transport mode) lets the Gerris 800 pass through relatively narrow passages, access slabs, decks, and interiors, and then deploy its outriggers to work safely.

Boom Geometry, Reach, and Work Envelope

The IMER Gerris 800 is a 3‑section boom designed to open in very tight spaces.

Boom characteristics:

• Max length of outreach: 26 ft (approx. 8 m) for horizontal placement.

• Max height served: 37 ft (11.2 m), allowing placement on elevated slabs, walls, and columns.

• Max depth of casting: about 16.5 ft down, including the 3 m rubber terminal hose, useful for basement or pit pours.

• Opening space: The boom requires only about 9' 2"–2.80 m to open, meaning it can operate in areas with low ceilings or limited overhead clearance.

• Turret rotation: 355°, giving nearly full circular coverage without needing to reposition the carrier.

This geometry allows the Gerris 800 to distribute concrete on foundation slabs, floors, pavements, walls, columns, pools, and precast elements within its radius without moving the pump or truck.

Bi-Energy Power: Gas Engine + 120V Electric

A key selling point of the IMER – Gerris 800 Gas Powered Crawler Concrete Placement Boom – 1128758 is its Bi‑Energy power system.

• Main power: 13 HP Honda GX390 gasoline hydraulic pump engine for outdoor use and maximum mobility.

• Auxiliary power: 1.5 HP single‑phase 120V electric hydraulic pump motor for operating indoors or in emission‑sensitive areas.

The electric mode allows the unit to work in closed environments “in the absence of exhaust gases and noise of the petrol engine,” which is important for interior pours, parking garages, and projects with strict environmental limits. IMER also offers a separate Lithium‑powered version (model 1128786), but the 1128758 model is specifically gas + 120V electric.

Radio Control and Safety Systems

The Gerris 800 is fully radio‑controlled, giving the operator precise control and improved safety.

Standard control and safety equipment includes:

• Wireless radio‑control with backlit display, giving real‑time feedback and intuitive operation of boom movements, travel, and outriggers.

• Two rechargeable lithium batteries for the radio control plus integrated charger on the machine.

• On‑board control panel for local operation if needed.

• Electronic hour counter and self‑diagnosis functions with anomaly reporting.

• Acoustic signaling of movements and abnormal conditions (audio alarms).

• Automatic block valves on all hydraulic actuators to lock movements in case of hose failure.

These systems help ensure safe and efficient operation, even when working around rebar, formwork, and congested reinforcement layouts.

Outriggers, Auto-Leveling, and Working Footprint

Stability is critical for concrete placement booms, and the Gerris 800 uses four hydraulically actuated outriggers with automatic leveling.

• Automatic outriggers leveling with electronic inclinometer, which self‑levels the machine to the correct working position, saving setup time and reducing error.

• Outrigger pads of about Ø 200 mm for stable support on typical slab and soil conditions.

• Overall outrigger footprint when stabilized: approximately 3.1 m × 3.26 m (9' 7" × 10' 1").

This compact stabilized footprint allows the IMER Gerris 800 to work in areas where truck‑mounted booms require too much clearance, such as inside industrial buildings or on narrow decks.

Compatibility with Concrete Pumps and Maximum Aggregate

The Gerris 800 is a placing boom only; it must be paired with a concrete pump.

• Pump connection: Designed to pair directly with any concrete pump equipped with 4" HD (heavy duty) fittings.

• Piping: DN 100 (4") steel boom piping with a removable header pipe and 3 m 4" rubber terminal hose.

• Maximum concrete aggregate size: 1 in (25 mm), suitable for standard structural concrete and many pumped mixes.

IMER specifically lists compatibility with the IMER Booster 20 concrete pump, recommending their combined use for a complete pumping and placing system. By connecting the Booster 20 (or any 4" pump) to the Gerris 800, you can pump from ground level and place concrete precisely across slabs, walls, and elevated elements within the boom’s range.

Typical Applications for the Gerris 800

The IMER – Gerris 800 Gas Powered Crawler Concrete Placement Boom – 1128758 is ideal for:

• Laying concrete on foundation slabs.

• Placing concrete on floors and pavements.

• Filling formwork for masonry walls and reinforced concrete walls.

• Filling formwork for swimming pools and tanks.

• Filling columns (including disposable formwork).

• Casting for containment or foundation piles.

• Filling THERMAL INSULATION walls in EPS, expanded clay, or fiber‑reinforced insulating formwork.

Because it is self‑propelled and compact, the Gerris 800 is especially useful on sites with limited crane access, low headroom, or complex geometry, such as parking structures, industrial plants, tunneling jobs, and renovation projects.

Benefits and Advantages of the IMER Gerris 800 – 1128758

Key advantages of the IMER Gerris 800 gas powered crawler boom include:

• Compact footprint: Only 2' 7" wide in transport and about 9' 7" × 10' 1" when stabilized, making it ideal for confined spaces.

• Flexible power: Bi‑Energy system (13 HP gas + 1.5 HP 120V electric) lets you work outdoors with full mobility and indoors without exhaust gases.

• Wide work envelope: Up to 37 ft height, 26 ft reach, 16.5 ft depth, and 355° rotation cover a wide area from a single setup.

• Remote‑controlled safety: Wireless radio control, auto‑leveling outriggers, and safety valves help protect workers while improving precision.

• Pump‑agnostic connectivity: Pairs with any 4" pump with HD fittings, including IMER Booster 20 and other concrete pumps.

• High aggregate tolerance: Handles pumped concrete and mortar up to 1 in aggregate, which covers most structural mixes.

For contractors seeking a mobile, self‑propelled concrete placing solution that can work in low‑ceiling environments and challenging access conditions, the IMER – Gerris 800 Gas Powered Crawler Concrete Placement Boom – 1128758 offers a powerful, highly maneuverable, and job‑proven option.