CN201129184Y - One-way step-back grouting device with small conduit outer valve - Google Patents

Abstract

The utility model belongs to the advance grouting reinforcement and water blocking technology for weak surrounding rocks of tunnels and underground engineering. The proposed one-way step-back grouting device with external valve in the small conduit is mainly composed of a grouting pump, a grouting pipe (1), a core pipe (4), and a small conduit (9). The front end of the small conduit (9) is a sharp cone shape and a closed structure, there are multiple overflow holes (11) on the wall of the small conduit (9), there is a groove on the outer wall of the pipe at the position of the overflow hole (11), and a metal sheet (10) is pasted in the groove ); the core tube (4) is located in the small conduit (9) and its front end has a threaded fixing nut (16), and a washer (13) is provided and a rubber stopper is sleeved between the washer (13) and the fixing nut (16) The slurry plug (14), the rear section of the core pipe (4) is a threaded structure and is connected with a top nut (5), and a top pipe (12) is sleeved between the top nut (5) and the washer (13); the core The rear end of the pipe (4) communicates with the grouting pump through the grout inlet pipe (1). The utility model can meet the needs of step-back grouting.

Description

One-way step-back grouting device with small conduit outer valve

technical field

The utility model belongs to the advanced grouting reinforcement and water blocking technology for weak surrounding rocks of tunnels and underground engineering, and mainly proposes a one-way segmental retreat grouting device with a small conduit outer valve.

Background technique

In the construction of tunnels and underground projects in weak water-bearing strata, the most likely problems are large deformation and collapse of the surrounding rock, water gushing and mud inrush at the excavation surface, endangering the safety of personnel and equipment, causing casualties, and in severe cases, causing surface collapse and vegetation damage. Destruction affects the normal life of residents and causes damage to the ground environment. In order to ensure construction safety, the currently commonly used ground reinforcement and water blocking method at home and abroad is the grouting method. The grouting method is to inject a certain amount of cementitious material into the rock formation or soil mass under a certain pressure to make it in the cracks of the rock formation or the soil. It flows, diffuses, fills, and consolidates in the voids of the body, forming a cemented body with a certain strength and low water permeability, which strengthens the formation and seals off groundwater, thereby increasing the self-stabilization time of the surrounding rock and creating conditions for the construction of the support structure. Small catheter grouting method is one of the main methods. However, the current small conduit grouting method usually uses the whole hole for one-time grouting, which cannot be grouted in sections according to the needs; the small conduit used is a steel flower tube structure, and during the jacking process, mud and sand are easy to enter along the holes on the pipe If the steel pipe is blocked, the grouting effect is not good or the grouting cannot be injected.

Contents of the invention

The purpose of this utility model is to propose a one-way segmental retreat grouting device with a small conduit outer valve, so that it can meet the needs of segmental retreat grouting.

The technical scheme adopted by the utility model to complete its inventive task is: it is mainly composed of a grouting pump, a grout inlet pipe, a core pipe, and a small conduit. A plurality of overflow holes, there is a groove on the outer wall of the pipe at the position of the overflow hole, and a metal sheet is pasted in the groove, which plays the role of sealing the hole and a one-way valve; the core pipe is located in the small conduit, and its front end has a threaded connection The fixed nut is provided with a washer and a rubber stopper is set between the washer and the fixed nut. The rear section of the core pipe is a threaded structure and is connected with a jacking nut. A jacking pipe is set between the jacking nut and the washer. Therefore, turn the tightening nut to move forward along the core tube, so that the jacking tube can be pressed forward against the washer so that the stopper is compressed and expands to close the gap between the core tube and the inner wall of the small conduit, preventing the slurry from passing through; The back end of the pipe communicates with the grouting pump through the grouting pipe.

The grouting process of the utility model is as follows: use a pneumatic drill to drill the hole to the designed hole depth, withdraw the drill pipe, put the small conduit into the drill hole, seal the gap between the outer wall of the nozzle and the inner wall of the drill hole with quick-setting cement, and The core tube (covered with a jacking tube) enters the small conduit to the design position, the rear end of the core tube is connected with the grouting pipe and the grouting pump, and the jacking nut is turned to move forward along the core tube, so that the jacking tube moves forward Tighten the washer so that the grout plug expands under pressure and tightens the inner wall of the small conduit upwards, closing the gap between the core pipe and the inner wall of the small conduit. During grouting, the grout flows out from the front port of the core pipe and enters between the small conduit and the core pipe; Blocked by the rubber grout stopper, the grout flushes away the metal sheet at the grout overflow hole of the small conduit, and enters the formation through the overflow hole; complete the grouting of this section. Stop the grouting and turn the jacking nut back to restore the rubber grout stopper to its original shape, pull the core tube back to the next grouting position, make the grout stopper squeezed again to close the gap between the small conduit and the core tube, and carry out This section of grouting operation, so repeatedly step back and segment grouting until the end of the hole grouting, exit the core pipe for the next hole grouting construction.

Adopting the device of the utility model can realize segmented grouting, so that the grout can spread relatively evenly, and the quality of grouting can be easily guaranteed. The structural design is relatively simple and reasonable, and the construction operation is easy.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure, 1. Slurry inlet pipe, 2. Slurry inlet valve, 3. Pressure relief valve, 4. Core pipe, 5. Jack nut, 6. Handle, 7. Washer, 8. Pipe collar, 9. Small conduit, 10, sheet metal, 11, overflow hole, 12, pipe jacking, 13, washer, 14, rubber stopper, 15, washer, 16, fixed nut.

Detailed ways

The utility model embodiment is described in conjunction with accompanying drawing:

As shown in Figure 1, the utility model is mainly composed of a grouting pump, a grouting pipe 1, a core pipe 4, and a small conduit 9; wherein the grouting pump is not shown in the figure. The front end of the small conduit 9 is tapered and closed. There are multiple overflow holes 11 on the wall of the small conduit. There are multiple grooves on the outer wall of the pipe at the position of the overflow holes, and metal sheets 10 are pasted in the grooves. The core pipe 4 is located in the small conduit 9, and its front end has a threaded fixing nut 16. The pipe is provided with a washer 13 and a rubber stopper 14 is sleeved between the washer 13 and the fixing nut 16. The rear section of the core pipe 4 is The threaded structure is connected with a jacking nut 5 , and a jacking pipe 12 is sleeved between the jacking nut 5 and the washer 13 , and the jacking nut 5 has a handle 6 to facilitate the rotation of the jacking nut 5 . The core pipe 4 communicates with the grouting pump through the grouting pipe 1 and is provided with a grouting valve 2 and a pressure relief valve 3 on the grouting pipeline.

Claims (1)

1. A one-way step-back grouting device with an external valve in a small conduit, which is characterized in that it is mainly composed of a grouting pump, a grout inlet pipe (1), a core pipe (4), and a small conduit (9). (9) The front end is pointed and conical and is a closed structure. There are multiple overflow holes (11) on the wall of the small conduit (9), and there are grooves on the outer wall of the tube at the position of the overflow holes (11). Metal sheet (10) is pasted inside; Core tube (4) is positioned at its front end in small conduit (9) and has the fixed nut (16) of screw connection, is provided with washer (13) and between washer (13) and fixed nut (16) ) is set between rubber stoppers (14), the rear section of the core pipe (4) is a threaded structure and is connected with a jacking nut (5), and a jacking nut (5) and the washer (13) are sleeved with The jacking pipe (12); the rear end of the core pipe (4) communicates with the grouting pump through the grout inlet pipe (1).