CN116065595A - A device and construction method for strengthening foundation pit slope with electroosmotic bolt - Google Patents

Abstract

The invention discloses a device and a construction method for reinforcing the side slope of a foundation pit with an electroosmosis combined anchor rod. In the surface soil of the slope of the foundation pit; the anchor member includes a spiral anchor shaft, a hollow anchor and an iron anode. shaped channel; the outer wall of the helical anchor shaft is provided with an external thread suitable for the thread groove; when the helical anchor shaft is screwed down in the hollow anchor rod, the iron anode is squeezed, so that the iron anode is guided by the volute channel Finally, it unfolds into a scroll-shaped disc structure; the iron anode is connected to the positive pole of the external DC power supply and used as the anode; the slope protection barbed wire is connected to the negative pole of the external DC power supply and used as the cathode. The invention combines electroosmosis to carry out drainage and slope consolidation on the basis of anchor bar slope protection, which can further improve the stability of foundation pit side slope fixation.

Description

A device and construction method for strengthening foundation pit slope with electroosmotic bolt

technical field

The invention relates to foundation pit side slope reinforcement, in particular to a device and a construction method for reinforcing foundation pit side slopes with electroosmosis combined with bolts.

Background technique

The excavation of the foundation pit is required before the construction of the building. The slope of the foundation pit is usually unstable and damaged due to insufficient supporting force, and certain reinforcement treatment is required to meet the requirements of the corresponding construction specifications. Bolt support is often used in slope treatment construction, and the prepared pole column is driven into the surface rock mass or the pre-drilled hole in the rock mass, and the special structure of the head and the pole body and the tail supporting plate are used, or rely on The bonding effect combines the surrounding rock and the stable rock mass to produce suspension effects, composite beam effects, and reinforcement effects to achieve the purpose of support. However, in practice, the effect of reinforcing the slope only through anchor rods is not ideal.

Contents of the invention

Purpose of the invention: The purpose of the invention is to propose a device and a construction method for strengthening the slope of a foundation pit with electroosmosis combined with bolts that have a better reinforcement effect.

Technical solution: The first aspect of the present invention provides a device for reinforcing the slope of a foundation pit with an electroosmotic bolt, including a bolt member and a slope protection barbed wire, wherein the anchor member is installed in the borehole of the foundation pit slope, and the slope protection barbed wire is laid In the surface soil of the slope of the foundation pit; the anchor component includes a spiral anchor shaft, a hollow anchor and an iron anode. shaped channel; the outer wall of the helical anchor shaft is provided with an external thread suitable for the thread groove; when the helical anchor shaft is screwed down in the hollow anchor rod, the iron anode is squeezed, so that the iron anode is guided by the volute channel Finally, it unfolds into a scroll-shaped disc structure; the iron anode is connected to the positive pole of the external DC power supply and used as the anode; the slope protection barbed wire is connected to the negative pole of the external DC power supply and used as the cathode.

In the present invention, after the direct current is fed into the soil, the soil water migrates from the anode to the cathode under the action of the electric field, and is discharged from the cathode. Due to the reduction of soil moisture content, different positions of the soil will settle and gradually become compact, increasing the shear strength of the soil, thereby achieving the effect of strengthening the foundation. The invention combines electroosmotic drainage and consolidation on the basis of bolt construction and anchoring of the foundation pit slope, and can further improve the stability of the foundation pit slope. In addition, the continuous downward rotation of the helical anchor shaft is inserted into the deeper soil, which can further increase the effective anchoring depth of the anchor member; the iron anode finally expands into a volute disc structure through the volute channel, and the contact area with the soil is effectively expanded. And the slope protection barbed wire laid corresponding to the surface soil provides a DC electric field for the soil in between.

Further, the hollow anchor rod is formed by fixing two semi-hollow rod bodies through a connecting ring. The hollow anchor rod is assembled through the connecting ring, which is convenient for laying the iron anode in the threaded groove before construction.

Further, a cross-shaped slot is provided at the top of the helical anchor shaft for rotating the helical anchor shaft.

Further, a tapered anchor head is provided at the bottom of the helical anchor shaft.

Further, the outer wall of the hollow anchor is rotated to be provided with uplift piles, and when the hollow anchor is pulled back upwards, the uplift piles rotate and are inserted into the soil. After the uplift pile is inserted into the surrounding wall soil, the overall uplift capacity of the anchor member can be improved.

The second aspect of the present invention provides a construction method for an electroosmosis combined anchor rod reinforcement device for foundation pit slopes, comprising the following steps:

(1) Drill and clear holes on the slope of the foundation pit according to the construction plan;

(2) Install the iron anode in the hollow anchor rod, install the hollow anchor rod in the borehole, pull back after touching the bottom, and insert the uplift pile into the surrounding wall soil;

(3) screw down into the helical anchor shaft, and the iron anode is squeezed and then unscrewed from the volute channel, and finally unfolded into a volute disc structure;

(4) After the anchor member is installed, connect the iron anode to the positive pole of the external DC power supply, inject grout at the drilled hole, and seal the anchor hole after the grouting is completed;

(5) Arrange the slope protection barbed wire on the surface soil of the slope, connect with the negative pole of the external DC power supply, and power on;

(6) Measure the surface soil strength, disconnect the power supply after reaching the standard, and the construction is completed.

The working principle of the present invention is as follows: first anchor the slope of the foundation pit through bolt construction to prevent collapse, further combine electroosmosis to drain and consolidate the soil in a specific area, and perform slope consolidation on the basis of slope protection, which can effectively improve The stability of the slope of the foundation pit meets the requirements of building construction.

Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the present invention can further improve the stability of foundation pit side slope fixation.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings required in the embodiments of the present invention are briefly introduced below. Obviously, the accompanying drawings described below are only embodiments of the present invention. For those skilled in the art, on the premise of not paying creative work, other drawings can also be obtained according to these drawings.

Fig. 1 is the structural representation of anchor member;

Fig. 2 is a schematic diagram of an exploded structure of Fig. 1;

Fig. 3 is a schematic diagram of the internal structure of the anchor member;

Fig. 4 is a schematic diagram of the structure of the upper end of the helical anchor shaft;

Fig. 5 is a schematic diagram of the use state of the anchor member;

Fig. 6 is a construction layout drawing of the present invention;

Reference signs: 1-anchor member, 110-helical anchor shaft, 111-cross-shaped slot, 112-inner shaft, 113-external thread, 114-tapered anchor head, 120-hollow anchor rod, 121-thread groove , 122-semi-hollow rod body, 123-connecting ring, 124-uplift pile, 125-volute channel, 130-iron anode, 2-slope protection barbed wire.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figures 1 to 6, a device for reinforcing the slope of a foundation pit with an electroosmotic bolt includes an anchor member 1 and a slope protection barbed wire 2, wherein the anchor member 1 includes a helical anchor shaft 110, a hollow anchor 120 and Iron anode 130.

The screw anchor shaft 110 is a solid high-carbon steel rod, and the main part is the inner shaft 112 . The upper end of the helical anchor shaft 110 is provided with a cross-shaped slot 111 so as to cooperate with an external lever to make the helical anchor shaft 110 rotate downwards to squeeze the iron anode 130 and insert it into the deep soil. The lower end of the helical anchor shaft 110 is a tapered anchor head 114, which can reduce the resistance suffered during the insertion process. The middle section of the helical anchor shaft 110 is provided with an external thread 113 , and the external thread 113 is adapted to the thread groove 121 provided on the inner wall of the hollow anchor rod 120 .

The hollow anchor rod 120 is formed by fixing two semi-hollow rod bodies 122 through three sets of connecting rings 123 . The outer wall of the hollow anchor rod 120 is rotated to install two groups of uplift piles 124, each set of four in different directions. The initial state of the uplift piles 124 is parallel to the semi-hollow rod body 122 with the end facing upwards. in the surrounding soil.

A volute channel 125 is provided at the lower end of the hollow anchor rod 120 , and the volute channel 125 guides the unscrewing of the iron anode 130 . The iron anode 130 is initially arranged in the threaded groove 121 on the inner wall of the hollow anchor rod 120, and is unscrewed from the volute channel 125 under the downward rotation and extrusion of the helical anchor shaft 110, and finally unfolded into a volute disc structure.

Referring to Fig. 6, a plurality of anchor rod members 1 are dislocated and inserted in the corresponding boreholes of the foundation pit slope according to the design requirements, and the slope protection barbed wire 2 is laid on the surface soil mass of the foundation pit slope. The iron anode 130 used as an anode corresponds to the slope protection barbed wire 2 used as a cathode, and is connected to an external DC power supply to provide a DC electric field for the soil in between, and perform drainage and consolidation treatment on the basis of slope anchorage. The interstitial water flows from the anode to the cathode under the action of the electric field, that is, migrates from the iron anode 130 to the slope protection barbed wire 2, and finally evaporates on the slope surface by sunlight or flows down the slope.

The following introduces the construction method of the above-mentioned electroosmosis combined anchor rod reinforcement device for the slope of the foundation pit. The construction method specifically includes the following steps:

(1) Choose sunny weather for construction, determine the slope area to be treated at the construction site, use corresponding equipment to carry out the drilling process according to the construction plan, and perform multiple cleanings after drilling to ensure that the inside of the hole is flat and stable;

(2) Install the iron anode 130 in accordance with the thread groove 121 on the inner wall of the hollow anchor rod 120. After the embedding is completed, merge the two semi-hollow rod bodies 122, and fix the hollow anchor rod 120 through the connecting ring 123, and install the hollow anchor rod 120 on the In the drilled hole opened in advance on the side slope, pull back after touching the bottom, so that the uplift pile 124 is inserted into the surrounding wall soil, and the hollow anchor rod 120 is fixed;

(3) Connect the cross-shaped slot 111 through the corresponding lever from the top of the hollow anchor rod 120, screw the spiral anchor shaft 110 downward under the corresponding state of the external thread 113 and the inner wall thread groove 121 of the hollow anchor rod 120, until the depth of penetration is the spiral anchor 2/3 of the length of the shaft 110 stops, during which the iron anode 130 is continuously squeezed by the spiral anchor shaft 110, and the lower end of the iron anode 130 is unscrewed from the scroll channel 125; after the spiral anchor shaft 110 is screwed down, the iron anode 130 Under the guidance of the volute channel 125, it finally presents a volute disk-shaped expansion form, and the anchor member 1 is installed at this time;

(4) Connect the iron anode 130 with the positive pole of the external DC power supply through wires, grout the drilled holes until the grout overflows, and seal the bolt hole;

(5) Arrange slope protection barbed wire 2 in the surface soil of the slope, connect the negative pole of the external DC power supply through a wire, and the iron anode 130 corresponds to the slope protection barbed wire 2 used as the cathode, and connect the power supply to carry out electroosmosis, and the water in the soil is Migrate from the anode to the cathode under the action of an electric field;

(6) Select the corresponding testing instruments to test the surface soil strength, disconnect the power supply after meeting the corresponding requirements, stop the construction, and tidy up recyclable construction devices such as wires and power supplies for the next construction.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present invention. , should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (6)

1. A device for electroosmosis combined bolt reinforcement of foundation pit slope, characterized in that, comprises bolt member (1) and slope protection barbed wire (2), wherein bolt member (1) is installed in the drill of foundation pit side slope In the hole, the slope protection barbed wire (2) is laid on the surface soil of the foundation pit slope; the anchor member (1) includes a spiral anchor shaft (110), a hollow anchor rod (120) and an iron anode (130), and the hollow anchor rod ( 120) The inner wall is provided with a threaded groove (121), the iron anode (130) is initially arranged in the threaded groove (121), and the lower end of the hollow anchor rod (120) is provided with a scroll channel (125); the outer wall of the spiral anchor shaft (110) is provided with There is an external thread (113) adapted to the thread groove (121); when the helical anchor shaft (110) is screwed down in the hollow anchor rod (120), it squeezes the iron anode (130), so that the iron anode (130) finally expands into a volute disk structure under the guidance of the volute channel (125); the iron anode (130) is connected to the positive pole of the external DC power supply, and is used as an anode; as the cathode. 2. The device according to claim 1, characterized in that the hollow anchor rod (120) is formed by fixing two semi-hollow rod bodies (122) through a connecting ring (123). 3. The device according to claim 1, characterized in that a cross-shaped slot (111) is provided at the top of the helical anchor shaft (110) so as to rotate the helical anchor shaft (110). 4. The device according to claim 1, characterized in that a tapered anchor head (114) is provided at the bottom of the helical anchor shaft (110). 5. The device according to claim 1, characterized in that, the outer wall of the hollow anchor (120) is rotatably provided with an uplift pile (124), and when the hollow anchor (120) is pulled back upward, the uplift pile (124) ) to turn and insert into the soil. 6. A construction method of the device according to claim 5, characterized in that, comprising the steps of: (1) Drill and clear holes on the slope of the foundation pit according to the construction plan; (2) Install the iron anode (130) in the hollow anchor rod (120), install the hollow anchor rod (120) in the borehole, pull back after touching the bottom, and insert the uplift pile (124) into the surrounding wall soil body; (3) screw down into the helical anchor shaft (110), the iron anode (130) is squeezed and then unscrewed from the volute channel (125), and finally unfolded into a volute disk structure; (4) After the anchor member (1) is installed, connect the iron anode (130) to the positive pole of the external DC power supply, inject grout at the drilled hole, and seal the anchor hole after the grouting is completed; (5) Arranging the slope protection barbed wire (2) on the surface soil of the slope, connecting with the negative pole of the external DC power supply, and energizing; (6) Measure the surface soil strength, disconnect the power supply after reaching the standard, and the construction is completed.

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