CS244243B1 - Non-return valve for injection work - Google Patents

Abstract

The invention relates to a non-return valve for injection work serving to prevent the backflow of the injection mixture before it solidifies. It is formed by a flow-through body made of elastic material with a flow-through opening and upper and lower sealing rings and with deformation edges, while a valve is placed on the upper sealing ring of the flow-through body. The flow-through body made of elastic material with sealing rings is in a modular design.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grouting shut-off closure for preventing grouting backflow prior to solidification.

In tamponing and grouting work, especially in small diameter overhead boreholes, mechanical and grouting needles or steel tubes are provided, provided with a stopcock or gate at the inlet end to prevent back injection of the injection mixture to inject the well end.

For example, when grouting the needle vault, a plurality of grouting needles are employed and awaiting the solidification pressure of the cementitious mixture under constant pressure. Thereafter, the injection needles are withdrawn and cleaned with water pressure. In the mines, steel pipes are usually used for grouting work, which are first cemented into the grouting well. These pipes are also provided with a stopcock or slider.

After waiting for a cementation stand of at least 8 hours, the cement mixture is injected through these steel tubes. After reaching the required pressure in the injection area, the inlet cock or gate valve on the steel injection tube is closed. The stopcock or gate valve is discarded after this operation, as are the steel injection pipes that remain cemented in the well. This greatly increases the cost of the actual grouting work.

Reverse closure according to MS. AO No. 163 688 has the disadvantages that it is labor-intensive, the closure is faulty and it is not possible to increase the injection pressure in the borehole as needed.

The aforementioned drawbacks are remedied by a recoil for injection molding work according to the invention, which consists of a flow-through body made of a flexible mass with a flow-through opening and at least an upper and a lower sealing ring with deformation edges, with a valve on the upper sealing ring of the flow body. . The flow-through body made of elastic material with sealing rings can be of modular design.

The advantage of the check valve according to the invention is that no steel pipes with stopcocks are required for grouting. The re-closure further has the advantage of being simple to manufacture, reliably closing the well against the grout outlet, allowing the grout pressure to be increased in the well as required by the modular design, substantially reducing the grouting time and saving grouting pipes and valves in use.

An exemplary embodiment of a non-return valve according to the invention is shown schematically in the accompanying drawings, in which Fig. 1 is a front view of the non-return valve, Fig. 2 is an axial section of the non-return valve;

The recoil for injection molding consists of a flow-through body 7 made of a resilient mass, for example rubber, with a flow-through opening 5 for insertion of the injection needle. On the flow body 1 are an upper sealing ring 2 and a lower sealing ring 3 with deformation edges 4 for easier insertion into the borehole and increase compliance. A valve 6 is provided on the upper sealing ring 2 of the flow body 1 to prevent the injection mixture from escaping from the borehole.

The injection shutter in modular design consists of segments of the flow-through body made of elastic mass with the upper sealing ring 2 and the lower sealing ring 3 with deformation edges 4. The flow body 7 is provided with a conical connection for connecting the individual segments to the inner sealing ring 21. be more, depending on the need of the injection pressure in the well. A flap 6 is provided on the upper sealing ring 2 of the flow body 1. A flow opening 5 is located on the lower sealing ring 3 of the flow body.

The end of the injection needle is inserted into the through hole 5 of the injection backflap, which is then inserted into the borehole. The grouting mixture is transported by pressure through the grouting needle and the back closure into the injected well. The grouting mixture settles and solidifies when the available well areas are filled. After the injection pressure has been reached, the injection needle is released and withdrawn from the backflow opening 5, whereby the back pressure of the injection mixture closes the flap 6 and prevents the injection mixture from escaping back into the well bore.

The injection shut-off valve is assembled from the individual segments according to the required pressure in the borehole by inserting the flow-body segment 1 into the segments of the flow body 2 with the upper sealing ring 2 into its conical recess. a further one and subsequently inserted into its conical recess, a segment of the flow body 2 ^{with a} lower sealing ring 3 and a flow opening 5. The injection work is then carried out in a similar manner.

The recoil for injection work can also be advantageously used for resin injection or other chemicals for reinforcing the profile of the mine, for strengthening the coal pillar and overburden rocks, for tamponizing. etc.

Claims (2)

A recoil for injection molding, characterized in that it comprises a flow-through body (1) of elastic mass with a flow-through opening (5) and at least an upper and a lower sealing ring (2,3) with deformation edges (4), a flap (6) is located in the upper sealing ring (2) of the flow body (1). 2. Return closure for grouting work according to item body (1) of elastic mass with sealing rings / 2,2 (3) 1, characterized in that the flow-through is of modular design.