Plunger grout pump for tunnelling

The plunger grout pump for tunneling is a core piece of high-pressure grouting equipment specifically designed for tunnel construction; it ensures the stable delivery of various engineering slurries—such as cement and bentonite slurries—and meets the requirements of grouting operations throughout the entire tunneling process.
Applications for the plunger grout pump:
Synchronous and secondary grouting behind shield tunnel segments to fill the gap between segments and the surrounding ground, thereby controlling surface settlement
Pre-grouting at the tunnel face to reinforce fractured surrounding rock, seal off groundwater, and prevent sudden water or mud inrushes
Repairing cracks in subway tunnel segments and filling voids behind the lining to enhance overall structural stability
Grouting for slope anchor bolts and fore-poling (small conduit) pre-support at tunnel portals to stabilize loose ground at the entrance/exit

The Grout Mixing and Pumping Station integrates grout mixing, storage/agitation, and high-pressure pumping functions onto a single equipment platform, enabling the continuous production of high-quality, consistent cement grout and its delivery to micropile boreholes at preset pressures. Featuring a compact design and ease of operation, it is suitable for new foundation construction, underpinning of existing structures, bridge rehabilitation, and foundation reinforcement projects with space constraints. In micropile construction, the cement grout serves not only to fill the borehole void but also plays a critical role in bonding the reinforcement (steel bars or pipes) to the surrounding ground. The uniformity and fluidity of the grout, as well as the stability of the injection process, directly influence the structural integrity, bond strength, and load-bearing capacity of the micropiles.

The plunger grout pump for bentonite slurry is a specialized piece of grouting equipment designed to transport high-concentration bentonite slurries with high solids content. It is engineered to accommodate the thixotropic gelling properties of bentonite, thereby avoiding issues such as rapid wear and insufficient startup pressure often encountered with standard grouting pumps.

In underground mines, grout mixing equipment is a key piece of equipment used to prepare grouting materials. It mixes solid materials (such as cement, loess, fly ash, etc.) with water in a certain proportion to form a uniform slurry that meets the required concentration, which can be used for mine fire prevention and extinguishing, goaf backfilling, roadway reinforcement and other projects.

A diesel cement grout injection pump is a device that uses a diesel engine as a power source to inject cement grout or other grouting materials into strata, fissures, or structures. It mainly consists of a power system, a pumping system, a mixing system, and a control system, and features high pressure, large flow rate, and strong adaptability.

The main applications of cement grout pump stations include:
Foundation reinforcement: Grouting for foundations in dams, tunnels, mines, etc., to improve bearing capacity.
Structural repair: Reinforcement of buildings and bridges, foundation lifting, soil compaction grouting, etc.
Underground engineering: Tunnel lining, contact grouting, and tunnel waterproofing.
Marine engineering: Underwater foundations, wharf scour protection, shoreline reinforcement, etc.

The Compact Grout Mixer and Pump is an integrated equipment that combines mixing and grouting functions. It is specifically designed for confined spaces, small-scale projects, or mobile operations. Its core features include a compact structure (typically occupying less than 5 square meters) and easy operation (can be operated by a single person), enabling seamless integration of grout preparation and high-pressure delivery. Typical applications include building repairs, small-scale foundation reinforcement, and localized tunnel seepage prevention, making it particularly suitable for construction environments where traditional large equipment is difficult to access.

The High-Shear Colloidal Grout Mixer Pump Unit is a piece of high-efficiency grouting equipment specifically designed for cement-based grouts. Utilizing a high-speed rotating high-shear impeller or centrifugal dispersion device (operating at speeds of 2,000–3,000 rpm), it thoroughly disperses materials such as cement and fly ash into their finest particles, ensuring complete wetting. This process significantly enhances grout stability while minimizing the risks of bleeding and segregation. These units are widely used in heavy-duty construction applications—including dams, tunnels, post-tensioned prestressing projects, underground mining, and geotechnical anchoring—and are compatible with various grout materials, such as neat cement grout, bentonite slurry, and micro-cement grout.

The medium-pressure cement grouting pump features a single-piston, double-acting design with a gear reducer, a compact structure, and is suitable for medium-scale grouting projects such as soil nailing and anchor bolting. Typical applications include:
1. Foundation reinforcement: Injecting cement grout into soft soil foundations to improve bearing capacity and prevent settlement.
2. Tunnels and underground engineering: Used for filling voids behind tunnel linings, reinforcing rock strata, and waterproofing.
3. Slope stabilization: Grouting and reinforcing landslides or unstable rock strata to enhance slope stability.
4. Concrete structure repair: Repairing defects such as cracks and hollow areas to improve structural durability.
5. Water conservancy projects: Construction of dam anti-seepage walls, dam reinforcement, and foundation treatment.

Cement grouting equipment is used for the preparation, storage, continuous agitation, and pressure delivery of cement grout. A well-configured setup—comprising a grout mixer, storage/agitation tank, and grout pump—creates a continuous, stable grouting system that ensures a reliable supply of grout for micropiles of varying depths, diameters, and construction methods. Micropiles are characterized by small diameters, flexible construction, high load-bearing capacity, and strong site adaptability; they are widely used for building underpinning, structural reinforcement, bridge foundation repair, and piling in confined spaces. Cement grouting is a critical step in micropile construction, as grout quality, injection pressure, and the actual volume injected directly influence pile strength and the bond between the pile and the surrounding soil.

High-pressure grouting pumps, based on high-pressure jet grouting technology, are used in drilling rig applications to achieve foundation reinforcement through the coordinated operation of the high-pressure pump and the drilling rig.

A high-pressure vertical grout pump is a specialized positive displacement pump designed to inject grout (a mixture of cement, water, and often additives) into cracks, voids, and fissures under high pressure. Applications: Soil nailing & ground stabilization. Tunneling and mining grouting. Dam and foundation repair. Post-tensioning duct grouting. Void filling beneath slabs or structures.

A vertical injection grout pump is a high-pressure grouting device specifically designed for vertical grouting operations. Its core function is to precisely inject grout (such as cement grout, chemical grout, etc.) into foundations, soil layers, or building cracks using high pressure to achieve engineering purposes such as reinforcement, seepage prevention, and leak sealing.

A cement bentonite grout mixing plant is a specialized system designed to produce homogeneous, stable slurries used primarily in geotechnical and civil engineering applications such as: Slurry walls (diaphragm walls), groundwater cutoff, tunneling and shaft sealing, landfill containment barriers, and soil nailing and ground improvement. Working Principle: Premixing Stage: Bentonite and water are thoroughly dispersed under low-speed stirring to form a colloidal solution.
Main Mixing Stage: Cement and additives are added, and homogeneous mixing is achieved through high-speed shear mixing.
Transportation and Storage: The mixed slurry is transported to the construction site via a pumping system or temporarily stored in mixing tanks to maintain its fluidity.

Grouting pumps inject cement-based or chemical grout into foundation cracks, pores, or weak layers under high pressure, forming a solidified mass to enhance the foundation’s bearing capacity. Its reinforcement principles encompass the following aspects:
Permeation consolidation: The grout fills soil pores, increasing density through cementation; suitable for highly permeable strata such as sandy soil and silt.
Fracturing reinforcement: High-pressure grout fractures the soil, forming a dendritic grout vein network, improving the overall strength of the foundation; commonly used for soft clay or collapsible loess.
Compaction grouting: High-pressure compaction of the surrounding soil creates a dense zone; suitable for saturated soft clay or artificial fill.

Gaode Equipment offers a high pressure grout plant combining twin mixing tanks and a plunger pump for cement grout preparation and injection. Suitable configurations support foundation grouting, rock anchoring, and soil nailing. Mixing capacity, pumping pressure, flow rate, and power options can be tailored to your project requirements.

The integrated grouting plant for micropile foundation work combines slurry preparation, storage, mixing, and high-pressure delivery functions into a single unit, ensuring a continuous supply of high-quality, consistent cement grout for micropile construction. Compared to setups using multiple standalone machines, this integrated station offers advantages such as a compact footprint, ease of operation, efficient workflow integration, and simplified on-site management; it is suitable for projects involving micropiles, soil nails/anchors, underpinning, and ground improvement. In micropile foundation construction, the quality of the grouting directly impacts the density of the pile body, the bond strength between the pile and the surrounding soil, and the ultimate load-bearing capacity. Given the small borehole diameters and significant drilling depths—combined with the fact that these projects often take place in spatially constrained areas or complex geological conditions—contractors demand higher standards regarding grout uniformity and stability, as well as precise control over grouting parameters.

Gaodetec’s newly developed full automatic grout batching mixing plant is a highly integrated system designed for the precise and continuous production of cement-based grouts (as well as bentonite/colloidal grouts) – widely used in jet grouting, soil mixing, tunnel boring, dam reinforcement, and underground construction. This upgraded grout mixing plant includes a 17m³ horizontal cement silo, a 1200L capacity pulping machine, a 2500L capacity agitator, a 1300L water tank, and a control cabinet.

Inverter speed high-pressure grouting machines eliminate the need for mechanical gearboxes, clutches, and other easily faulty transmission components, resulting in smaller pump size and lighter weight. They are compact in structure and highly reliable.

The Colloidal Grout Plant for Micropile Injection integrates high-speed mixing, storage, continuous agitation, and pressure injection capabilities, enabling the continuous supply of uniform, stable, and highly pumpable cement grout for micropile construction.
Micropiles are characterized by small diameters, construction flexibility, and strong site adaptability; they are widely used in building foundation reinforcement, bridge maintenance, slope stabilization, underground space renovation, and construction in confined areas. Micropiles typically form load-bearing structures through processes such as drilling, the installation of steel bars or pipes, and cement grout injection, where the quality of the grout directly impacts the integrity of the pile and the bond between the reinforcement and the surrounding ground.

The double-plunger bentonite grout pump is a positive-displacement grouting unit specifically designed for high-viscosity bentonite slurries. It achieves continuous suction and discharge through the alternating reciprocating motion of two plungers, significantly reducing pressure pulsation compared to single-plunger pumps, and serves as core grouting equipment for tunneling, mining, and foundation reinforcement projects.
Applications of the double-plunger bentonite grout pump:
Synchronous and secondary backfill grouting for shield tunnels, enabling precise control of surface settlement
Grouting for diaphragm walls and dam curtains to stabilize geological structures and prevent water seepage
Reinforcement and water-blocking in fractured rock strata within underground mines; suitable for explosion-proof operating environments
Long-distance transport of bentonite friction-reducing slurry for trenchless pipe-jacking projects
Grouting for micropiles and anchor rods; foundation reinforcement in confined spaces

Our integrated grout mixing and pumping station combines mixing, agitation, and grout injection in one compact system. Configured to suit cement, bentonite, or microfine cement grouts, it supports ground anchoring, foundation improvement, and seepage control projects. Mixing capacity, pump output, and working pressure can be customized to meet your application requirements.

The grout pump and mixing station is an integrated device combining a mixer, mixing tank, and grouting pump. It injects cement-based or chemical grout into strata, structural fissures, or soil and rock masses under high pressure to achieve reinforcement, seepage prevention, or filling functions. Its working principle can be divided into three stages:
1. Cement grout preparation: A high-speed vortex mixer rapidly mixes cement, bentonite, and water, forming a homogeneous grout within 10 seconds, preventing particle sedimentation.
2. Cement grout storage: The mixing tank continuously agitates the grout to prevent solidification and ensure a continuous supply.
3. High-pressure grouting: A hydraulically driven pump generates high pressure through piston or plunger movement, injecting the grout into the target area. The pressure range is 0-45 Bar (some models reach 0-100 Bar), and the flow rate is 0-100 L/min.

A high-pressure cement grouting pump is an industrial device that delivers cement grout (or chemical grout) under high pressure. It is widely used in engineering fields such as foundation reinforcement, seepage prevention and plugging, and structural reinforcement. Its core function is to inject grout under high pressure to fill voids in soil or concrete structures, forming a stable composite structure and improving the load-bearing capacity and durability of the project.

A hydraulic high-pressure horizontal cement grouting pump is a specialized device driven by a hydraulic system to inject cement slurry and other readily setting materials into rock formations, soil cracks, or gaps in building structures at high pressure. The core principle is based on hydraulic transmission and the reciprocating motion of a plunger:
Hydraulic drive: An electric motor drives a gear pump, which delivers high-pressure oil through a relief valve and into a hydraulic reversing valve block, controlling the reciprocating motion of the hydraulic cylinder.
Synchronized grouting: The hydraulic cylinder and the working cylinder move synchronously, with suction and discharge valves at each end. This allows for single-liquid or dual-liquid grouting (e.g., a mixture of cement slurry and water glass).

The high shear cement slurry mixer is designed for the rapid preparation of homogeneous cement grout used in demanding construction and geotechnical applications. Its high-intensity mixing action creates strong turbulence and shearing forces, allowing cement, water, bentonite and compatible additives to be dispersed efficiently.
Compared with conventional paddle mixers, the machine produces smoother and more consistent slurry while helping reduce cement agglomeration, sedimentation and material separation. The resulting grout offers stable flow characteristics for pumping and controlled injection into boreholes, rock fissures, foundations and underground structures.
The mixer can operate independently or be integrated with an agitator tank and grout pump to form a continuous grout mixing and injection system. Mixing capacity, power source, voltage and control configuration can be customized according to project requirements.

Compact grout injection station is an integrated, space-saving system that combines a high speed mixer, storage tank (agitator), and grout pump in a single base frame—typically occupying less than 5 square meters and can be operated by one person.

This integrated grouting plant is specifically designed for shield/TBM tunnel segment lining. It combines a high-speed grouting tank, a grout storage and mixing tank, and a high-pressure grouting pump into one unit. During tunnel excavation, it prepares cement/bentonite grout to fill the annular gap (annular gap) between the lining segments and the surrounding rock.