CN104213562B - The blocking device in a kind of slip casting aperture and using method thereof - Google Patents

Abstract

The invention discloses a blocking device for a grouting hole, which can solve the problem that the gap between the grouting pipe and the wall of the grouting hole is not tightly sealed, and prevent the grouting liquid from passing between the grouting pipe and the wall of the grouting hole. The waste of grouting materials caused by the leakage of the gaps to the surface can avoid the sudden drop of grouting pressure and the insufficient filling of the stratum to be reinforced, so as to ensure the quality of the project and the progress of construction. The blocking device of the grouting hole, the grouting pipe is inserted into the wall of the grouting hole and there is a gap between the two, and the device includes the expansion resistor mold bag, the first fastening element, the second fastening element, the expansion resistance The device mold bag is set on the grouting pipeline, and the front and rear ends of the expansion resistor mold bag are respectively fixed to the grouting pipeline through the first and second fastening elements, and the filler is injected into the expansion resistor mold bag, and the filler is filled with After the mold bag of the expansion resistor is cemented with the wall of the grouting hole, it meshes with the rock mass to form a stone body. Methods of using the device are also provided.

Description

Blocking device for grouting orifice and method of use thereof

technical field

The invention belongs to the technical field of engineering, and in particular relates to a blocking device for a grouting hole and a method for using the device, which are mainly used in grouting technologies for water conservancy and hydropower projects, foundation treatment, or tunnel anti-seepage and plugging.

Background technique

At present, in the process of anti-seepage curtain grouting, foundation reinforcement, and anti-seepage plugging grouting in embankments and underground caves, common rubber plugs and improved rubber ring orifice sealing methods are used between the closed grouting pipe and the wall of the grouting hole. The annular gap is not tightly sealed. The working principle of these devices is to rely on the rubber material to be inserted into the grouting hole, the rubber material produces elastic deformation, and then the pressure acting on the wall of the grouting hole generates frictional force, and the frictional force is used to resist the grouting pressure. Through experimental research, it is found that when the grouting pressure is high, the friction force of the rubber blocking device cannot resist the grouting pressure, which leads to the failure of the rubber blocking device, and then causes the grouting fluid to seep from the gap between the grouting pipe and the wall of the grouting hole. Leakage to the surface, waste of grouting materials, sudden drop of grouting pressure, insufficient filling of the ground to be reinforced, affecting project quality and construction progress.

Contents of the invention

The technical problem of the present invention is: to overcome the deficiencies of the prior art, to provide a blocking device for the grouting hole, which can solve the problem that the gap between the grouting pipe and the wall of the grouting hole is not tightly sealed, and prevent the grouting The waste of grouting material caused by the leakage of liquid from the gap between the grouting pipe and the wall of the grouting hole to the surface can avoid the sudden drop of grouting pressure and insufficient filling of the ground to be reinforced, and ensure the quality of the project and the progress of the construction.

The technical solution of the present invention is: the blocking device of the grouting hole, the grouting pipe is inserted into the wall of the grouting hole and there is a gap between the two, the device includes a dilatation device mold bag, a first fastening element, The second fastening element, the expansion resistor mold bag is set on the grouting pipeline, and the front and rear ends of the expansion resistor mold bag are respectively fixed on the grouting pipeline through the first and second fastening elements, and the filler is injected into the expansion Resistor mold bag, the filler fills the expansion resistor mold bag and cements with the wall of the grouting hole to mesh with the rock mass to form a stone body.

Because the present invention adopts the dilatator die bag that is sleeved on the grouting pipeline, the filler fills the dilatator die bag and cements with the wall of the grouting hole to mesh with the rock mass to form a stone body. The shear strength resists the effect of grouting pressure, and generally speaking, the stone body has a high shear strength, which makes this blocking device of the grouting orifice able to withstand high grouting pressure, thereby solving the problem of grouting pipes and The gap between the grouting hole walls is not tightly sealed, preventing the grouting fluid from leaking from the gap between the grouting pipe and the grouting hole wall to the surface and causing the waste of grouting materials, avoiding a sudden drop in grouting pressure, Insufficient filling of the ground to be reinforced ensures the quality of the project and the progress of the construction.

Also provided is a method of using the blocking device for the grouting orifice, comprising the following steps:

(1) Measure the external water pressure, obtain the expected grouting pressure, and determine the length of the mold bag of the expansion resistor;

(2) according to actual conditions on site, select the blocking device of the grouting orifice of the present invention, put into the grouting hole wall after assembling;

(3) Turn on the filler injection pump, and obtain the injection pressure curve and flow rate through the grouting flow pressure recorder; when the injection pressure continues to increase, the dilatator mold bag starts to filter water, and the pressure increase should not be too large; when the injection pressure After continuous increase, when the pressure curve is close to the horizontal straight line, the water filter of the expansion resistor mold bag is completed, and the hole wall begins to be squeezed. It is necessary to maintain the injection pressure for a certain period of time before increasing the pressure until the expected grouting pressure is reached; when the injection pressure reaches the expected After the grouting pressure, it is necessary to maintain the pressure for 3-5 minutes; finally, close the filler injection pump to complete the filling of the dilatator mold bag;

(4) Grouting through the grouting pipeline.

Description of drawings

Fig. 1 shows a schematic diagram of the force of the blocking device of the grouting orifice according to the present invention;

Fig. 2 shows a schematic structural view of a first embodiment of a blocking device for a grouting orifice according to the present invention;

Fig. 3 shows a schematic diagram of a plugging device for injecting filler into the grouting orifice of Fig. 2;

Fig. 4 has shown the schematic diagram that filler is filled with the blocking device of the grouting hole of Fig. 2 and squeezes the grouting hole wall;

Fig. 5 shows the schematic diagram of grouting after the blocking device of the grouting orifice of Fig. 2 is blocked;

Fig. 6 shows a schematic structural view of a second embodiment of a blocking device for a grouting orifice according to the present invention;

Fig. 7 shows a schematic diagram of the plugging device for injecting the filler into the grouting orifice of Fig. 6;

Fig. 8 shows the schematic diagram of the plugging device filling the grouting orifice of Fig. 6 and extruding the grouting hole wall;

Fig. 9 shows a schematic diagram of grouting after the blocking device of the grouting hole in Fig. 6 is blocked.

detailed description

As shown in Figure 2-9, the blocking device of the grouting hole, the grouting pipe 2 is inserted into the grouting hole wall 1 and there is a gap between the two, the device includes the expansion resistor mold bag 3, the first tight fixed element, the second fastening element, the expansion resistor mold bag 3 is set on the grouting pipeline 2, and the front and rear ends of the expansion resistor mold bag 3 are respectively fixed to the grouting pipeline by the first and second fastening elements 2, the filler is injected into the mold bag of the expansion resistor, and after the filler is filled with the mold bag of the expansion resistor, it is cemented with the wall of the grouting hole and meshed with the rock mass to form a stone body.

Because the present invention adopts the dilatator die bag that is sleeved on the grouting pipeline, the filler fills the dilatator die bag and cements with the wall of the grouting hole to mesh with the rock mass to form a stone body. The shear strength resists the effect of grouting pressure, and generally speaking, the stone body has a high shear strength, which makes this blocking device of the grouting orifice able to withstand high grouting pressure, thereby solving the problem of grouting pipes and The gap between the grouting hole walls is not tightly sealed, preventing the grouting fluid from leaking from the gap between the grouting pipe and the grouting hole wall to the surface and causing the waste of grouting materials, avoiding a sudden drop in grouting pressure, Insufficient filling of the ground to be reinforced ensures the quality of the project and the progress of the construction.

In addition, as shown in Figures 2-5, several grouting pipe surface grouting holes 4 are opened on the pipe wall of the grouting pipe between the first and second fastening elements, and the first fastening element is a conventional fastening element. Part 5, the second fastening element is the constant pressure pipe sealing device 6 in the hole, and the filler is injected into the expansion resistor mold bag 3 through the grouting hole on the surface of the grouting pipe after passing through the grouting pipe.

Fig. 3 shows the schematic diagram of the plugging device of filling material injected into the grouting orifice of Fig. 2; Fig. 4 shows the schematic diagram of filling material filling the blocking device of the grouting orifice of Fig. 2 and extruding the grouting hole wall; Fig. 5 shows a schematic diagram of grouting after the blocking device of the grouting orifice in FIG. 2 is blocked. The arrows in the figure indicate the flow direction of the filler. After the filler enters the grouting pipeline, it is blocked by the constant pressure sealing device 6 in the hole, and will flow out from the grouting hole 4 on the surface of the grouting pipeline into the expansion resistor mold bag 3. As the injection volume increases, the expansion resistor mold bag will 3 is continuously filled, as shown in Figure 3. As the dilatator mold bag 3 continues to fill, the dilatator mold bag filters and retains cement particles in the cement slurry (when the filler is a slurry containing cement slurry). When the mold bag of the expansion resistor is filled with cement particles, the mold bag of the expansion resistor squeezes the wall of the grouting hole, and the wall of the grouting hole is deformed under pressure, and then the mold bag of the expansion resistor meshes with the deformed wall of the grouting hole A high-strength stone body was formed, as shown in Figure 4. When the injection pressure continues to increase and exceeds the pressure critical value of the constant pressure sealing device 6 in the hole, the constant pressure sealing device 6 in the hole fails, and the grouting fluid enters the deep formation through the grouting pipeline, as shown in Figure 5.

In addition, as shown in Figures 6-9, the device also includes a filling tube 7, the filling tube 7 passes through the first fastening element and is inserted into the mold bag of the expansion resistor, and the first and second fastening elements are conventional fasteners 5. The filler is injected into the expander mold bag 3 through the filling pipe.

Fig. 7 shows the schematic diagram of the plugging device of filling material injected into the grouting orifice of Fig. 6; Fig. 8 shows the schematic diagram of filling material filling the blocking device of the grouting orifice of Fig. 6 and extruding the grouting hole wall; Fig. 9 shows a schematic diagram of grouting after the blocking device of the grouting hole in FIG. 6 is blocked. The arrows in the figure indicate the flow direction of the filler. After the filler enters the filling pipe 7, it directly enters the dilatator mold bag 3, and as the injection volume increases, the dilatator mold bag 3 is continuously filled, as shown in FIG. 7 . As the dilatator mold bag 3 continues to fill, the dilatator mold bag filters and retains cement particles in the cement slurry (when the filler is a slurry containing cement slurry). When the expansion resistor mold bag is filled with cement particles, the expansion resistor mold bag 3 squeezes the hole wall, and the hole wall is deformed under pressure, and then the expansion resistor mold bag 3 meshes with the deformed grouting hole wall to form a high Strength stone body, as shown in Figure 8. When the injection pressure of the expander mold bag 3 reaches the expected grouting pressure, the deep formation can be grouted through the grouting pipeline, as shown in FIG. 9 .

In addition, the first fastening element is 30-50 cm backwards from the grouting orifice. This distance is better for blocking effect, and the construction is more convenient.

In addition, the mold bag 3 of the expansion resistor is a geotextile. The transmittance of this material filler is relatively high, and the cost is low.

In addition, the filler is a slurry containing 90%-100% cement slurry. Experiments have proved that the blocking effect and construction cost of the filler with this cement slurry ratio are better.

Also provided is a method of using the blocking device for the grouting orifice, comprising the following steps:

(1) Measure the external water pressure, obtain the expected grouting pressure, and determine the length of the mold bag of the expansion resistor;

(2) According to the actual conditions on site, select a preferred mode of the present invention (directly inject filler through grouting pipe) or another preferred mode (inject filler through filling pipe) blocking device for grouting orifice, after assembling Put it into the wall of the grouting hole;

(3) Turn on the filler injection pump, and obtain the injection pressure curve and flow rate through the grouting flow pressure recorder; when the injection pressure continues to increase, the dilatator mold bag starts to filter water, and the pressure increase should not be too large; when the injection pressure After continuous increase, when the pressure curve is close to the horizontal straight line, the water filter of the expansion resistor mold bag is completed, and the hole wall begins to be squeezed. It is necessary to maintain the injection pressure for a certain period of time before increasing the pressure until the expected grouting pressure is reached; when the injection pressure reaches the expected After the grouting pressure, it is necessary to maintain the pressure for 3-5 minutes; finally, close the filler injection pump to complete the filling of the dilatator mold bag;

(4) Grouting is performed through the grouting pipeline (stratum grouting can be performed without waiting for solidification).

Wherein step (1) obtains the meshing length of the mold bag of the dilatator and the wall of the grouting hole by the formula (1):

${\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}_{\mathrm{<span\; class="notranslate">\; \&tau;</span>}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; \&pi;</span>}\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; P</span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; \&times;</span>\frac{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; D.</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; d</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

As shown in Fig. 1, the shear strength of the stone body is σ _τ , P1 is the grouting pressure, D is the diameter of the grouting hole wall, d is the diameter of the grouting pipe, and L is the engagement between the dilatator mold bag and the grouting hole wall length.

After obtaining the engagement length of the dilatator mold pocket and the wall of the grouting hole, add an appropriate value (for example L) to obtain the length of the dilatator mold pocket.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are still within the scope of this invention. The protection scope of the technical solution of the invention.

Claims (5)

1. the blocking device in slip casting aperture, in grouting pipe (2) inserts slip casting hole wall (1) and Therebetween there is space, it is characterised in that: this device include swollen resistance device mould bag (3), first Tightening member, the second tightening member, swollen resistance device mould bag (3) is enclosed within grouting pipe (2),

And the front and back ends of swollen resistance device mould bag (3) is fixed to by first, second tightening member respectively On grouting pipe (2), filler injects swollen resistance device mould bag, after filler is full of swollen resistance device mould bag Cementing with slip casting hole wall and engage with rock mass formation Seed harvest；

Some grouting pipe tables are had on the tube wall of the grouting pipe between first, second tightening member Face slurry outlet (4), the first tightening member is conventional fasteners (5), and the second tightening member is Hole pressure decided at the higher level but not officially announced pipe sealing device (6), filler is gone out by grouting pipe surface after grouting pipe Swollen resistance device mould bag (3) is injected in slurry hole.

The blocking device in slip casting aperture the most according to claim 1, it is characterised in that:

First tightening member distance slip casting aperture 30-50cm backward.

The blocking device in slip casting aperture the most according to claim 1, it is characterised in that:

Swollen resistance device mould bag (3) is geotextiles.

The blocking device in slip casting aperture the most according to claim 1, it is characterised in that:

Described filler is the slurries containing 90%-100% cement grout.

5. a using method for the blocking device in slip casting aperture according to claim 1, its feature It is: comprise the following steps:

(1) measure external water pressure, it is thus achieved that expection grouting pressure, and determine the length of swollen resistance device mould bag；

(2) according to on-the-spot physical condition, the blocking device in the slip casting aperture of claim 2 or 3 is selected, Put into after assembling in slip casting hole wall；

(3) open filler injection pump, obtain injection pressure curve by flow rate of grouting manograph And flow；When injection pressure continues to increase, swollen resistance device mould bag starts drainage, need to control pressure and increase Width is unsuitable excessive；When after injection pressure persistently increases, pressure curve is close to horizontal linear, swollen resistance device Mould bag drainage is complete, starts to extrude hole wall, increases pressure after need to keeping injection pressure certain time again, Until reaching expection grouting pressure；After injection pressure reaches expection grouting pressure, this pressure need to be maintained Power 3-5 minute；Finally, close filler injection pump, complete the filling of swollen resistance device mould bag；

(4) slip casting is carried out by grouting pipe.