A method for protecting the anchor rod axial force meter during the sealing of the anchor

Abstract

The present invention relates to a method for protecting a bolt load cell during the sealing of the anchor. The method includes the following steps: drilling holes in the concrete waist beam around the bolt load cell, inserting 4 positioning steel bars, erecting a frustum-shaped formwork outside the outer circle of the 4 positioning steel bars, where the positions of the 4 positioning steel bars correspond to the four corners of the quadrilateral on the top surface of the frustum-shaped formwork; sleeving the PVC pipe on the bolt load cell, sealing the small groove on the PVC pipe tightly with transparent tape, sealing the pipe orifice at the end of the PVC pipe away from the steel backing plate with foaming glue, and then sealing it again with transparent tape outside the foaming glue; finally, injecting the concrete into the frustum-shaped formwork through the opening using the diversion groove, thus completing the anchor sealing operation. The present invention enables the bolt load cell to work normally after the anchor is sealed, extending its service life. The PVC pipe, foaming glue and transparent tape are all common building materials, with convenient material collection and simple construction.

Description

Technical Field

[0001] The present invention relates to the field of geotechnical engineering construction, and particularly to a method for protecting a bolt load cell during the concrete sealing treatment of an anchor head equipped with the bolt load cell. Background Art

[0002] Currently, in the field of permanent slope support construction, when the slope height is relatively large, a prestressed anchor bolt retaining wall is a common retaining structure. During the tensioning process of the anchor bolts, a corresponding number of bolt load cells need to be installed according to the specification requirements to regularly monitor the bolt axial force. After the anchor bolts are tensioned, in order to prevent adverse effects such as corrosion on the anchor head part exposed outside the retaining wall, it is usually necessary to carry out concrete sealing treatment on the anchor head part, which is commonly known as anchor sealing. If concrete is directly poured on the anchor head equipped with the bolt load cell, each part of the bolt load cell will be completely covered by the concrete and affected, resulting in the bolt load cell being unable to normally reflect the data during the bolt axial force monitoring. Summary of the Invention

[0003] (1) Technical Problems to be Solved

[0004] In order to solve the above problems of the prior art, the present invention provides a method for protecting a bolt load cell during anchor sealing concrete, which solves the problem that the bolt load cell is directly in contact with the concrete during anchor sealing. The bolt load cell is not affected by the concrete, can normally reflect the axial force monitoring data, and extends the service life.

[0005] (2) Technical Solutions

[0006] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0007] A method for protecting a bolt load cell during anchor sealing concrete, comprising the following steps:

[0008] S1: Punch holes in the concrete waist beam around the bolt load cell, and insert 4 positioning steel bars with a diameter of 0.8 - 1.2 cm;

[0009] S2: Erect a frustum-shaped formwork outside the 4 positioning steel bars. The frustum-shaped formwork is supported by a movable support placed on the ground. An opening is provided at the upper part of the frustum-shaped formwork, and a movable diversion trough is equipped at the same time. The positions where the 4 positioning steel bars are located correspond to the four corners of the quadrilateral on the top surface of the frustum-shaped formwork;

[0010] S3: Open a small groove in the PVC pipe;

[0011] S4: Sleeve the PVC pipe on the bolt load cell, and the end of the PVC pipe with the small groove is in contact with the steel backing plate;

[0012] S5: Use transparent tape to tightly seal the small groove on the PVC tube;

[0013] S6: Use foam glue to seal the pipe opening of the PVC pipe away from the steel pad, and use transparent tape to seal it again outside the foam glue;

[0014] S7: Finally, the guide groove is used to inject concrete into the tetrahedral formwork through the opening, and then the opening is sealed. After the concrete solidifies naturally, the movable bracket is removed, and the tetrahedral formwork is dismantled, and the anchor sealing operation is completed.

[0015] Optionally, one end of the positioning steel bar has a 90-degree hook, and the other end has no hook;

[0016] The direction of the positioning steel bars is perpendicular to the surface where the concrete waist beam is located;

[0017] The end without the hook is inserted into the concrete waist beam, using a straight anchor method, and the end with the 90-degree hook is placed in the anchor concrete, using a bent anchor method.

[0018] The direction of the positioning steel bar is perpendicular to the surface where the concrete waist beam is located. The surface where the concrete waist beam is located is an inclined surface. The sealing anchor concrete will slide down on the inclined surface due to its own gravity. The hook of the positioning steel bar is used to tie the sealing anchor concrete. The direction of the positioning steel bar is perpendicular to the surface of the concrete waist beam, which can form a better support.

[0019] Optionally, the bottom side of the quadrangular pyramid-shaped formwork is 30 cm long, the top side is 20 cm long, and the height is 15 cm. By controlling the amount of anchoring concrete, on the one hand, the deadweight can be reduced and the bearing pressure of the positioning steel bars can be reduced, and on the other hand, materials can be saved.

[0020] Optionally, the small groove provided in the PVC tube corresponds to the raised position of the data line of the anchor axial force gauge;

[0021] The length of the PVC pipe is the length of the anchor axial force gauge plus the anchor.

[0022] The size of the small groove on the PVC tube is slightly larger than the size of the data line of the anchor axial force gauge. The length of the PVC tube is the length of the anchor axial force gauge plus the anchor. The PVC tube can be snapped onto the anchor axial force gauge to achieve better fixation.

[0023] Preferably, the diameter of the four positioning steel bars is 1 cm.

[0024] Optionally, the inner diameter of the PVC tube is slightly larger than the outer diameter of the anchor axial force gauge; the PVC tube is sleeved on the anchor axial force gauge, and after the PVC tube is sealed, concrete is used to seal the anchor, and the PVC tube is tightly combined with the anchor axial force gauge to ensure overall stability.

[0025] Optionally, when using the transparent tape to seal the small groove and the foaming agent, the transparent tape should be sealed in at least two layers. The transparent tape isolates the contact between the concrete and the anchor rod load cell during the anchor sealing operation. The erosive substances contained in the concrete will erode the transparent tape. The double-layer design can ensure that the concrete does not erode the anchor rod load cell before solidification.

[0026] Optionally, the weight ratio of the ingredients of the concrete is as follows: water:cement:sand:gravel is 0.4:1:1.5:1.8;

[0027] The anchor sealing concrete is a non-load-bearing structure, which is only used to protect the anchor rod load cell from erosion. At the same time, the anchor sealing concrete is located on the inclined surface of the concrete waist beam. The concrete prepared with the above weight ratio reduces the amount of gravel and increases the amount of sand compared with the standard concrete;

[0028] The above weight ratio is the data obtained from experiments, which reduces the weight of the anchor sealing concrete structure, improves the fluidity and adhesiveness of the concrete. During the construction operation, the concrete can be better shaped, increasing the adhesive force between the anchor sealing concrete and the concrete waist beam 4, saving materials, and increasing economic benefits while completing the anchor sealing operation and ensuring the construction quality.

[0029] (III) Beneficial Effects

[0030] The beneficial effects of the present invention are:

[0031] A method for protecting an anchor rod load cell when sealing an anchor with concrete according to the present invention uses materials including a PVC pipe, a transparent tape and a foaming agent. The PVC pipe is used to wrap the anchor rod load cell and the anchor fixture. Small grooves are provided on the PVC pipe corresponding to the positions of the data line protrusions. The transparent tape and the foaming agent are used for auxiliary sealing. During the anchor sealing, it is ensured that the anchor rod load cell is completely isolated from the concrete and not affected, so that the anchor rod load cell can work normally in the later stage and its service life is extended. At the same time, the PVC pipe, the foaming agent and the transparent tape are all common building materials, which are convenient to obtain materials and simple to construct. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is the design drawing of the present invention;

[0033] Figure 2 It is the installation schematic diagram of the present invention.

[0034]

Description of the Reference Numerals

[0035] 1: PVC pipe;

[0036] 2: Anchor rod load cell;

[0037] 3: Steel backing plate;

[0038] 4: Concrete waist beam;

[0039] 5: Anchor;

[0040] 6: Data cable;

[0041] 7: Foam glue;

[0042] 8: Transparent tape;

[0043] 9: Position the steel bars. DETAILED DESCRIPTION

[0044] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0045] Example 1

[0046] like Figure 1 , Figure 2 As shown, after the tensioning operation of the anchor rod is completed, the exposed anchor head is sealed;

[0047] A method for protecting an anchor rod axial force gauge when sealing anchor concrete comprises the following steps:

[0048] S1: Drill holes in the concrete waist beam 4 around the anchor axial force gauge 2 and insert four positioning steel bars 9 with a diameter of 0.8-1.2 cm;

[0049] S2: A quadrangular pyramid-shaped formwork is set up on the outer ring of the four positioning steel bars 9, and the quadrangular pyramid-shaped formwork is supported by a movable bracket placed on the ground. An opening is provided on the upper part of the quadrangular pyramid-shaped formwork, and a movable guide groove is provided. The positions of the four positioning steel bars 9 correspond to the positions of the four corners of the quadrilateral on the top surface of the quadrangular pyramid-shaped formwork;

[0050] S3: Open a small groove on the PVC pipe 1;

[0051] S4: Put the PVC tube 1 on the anchor axial force gauge 2, and one end of the PVC tube 1 with a small groove is in contact with the steel pad 3;

[0052] S5: Use transparent tape 8 to tightly seal the small groove on the PVC tube 1;

[0053] S6: Use foam glue 7 to seal the pipe opening of the PVC pipe 1 away from the steel backing plate 3, and use transparent tape 8 to seal the outside of the foam glue 7 again;

[0054] S7: Finally, the guide groove is used to inject concrete into the tetrahedral formwork through the opening, and then the opening is sealed. After the concrete solidifies naturally, the movable bracket is removed, and the tetrahedral formwork is dismantled, and the anchor sealing operation is completed.

[0055] The frustum-shaped formwork is supported by a movable support placed on the ground. The frustum-shaped formwork does not contact the positioning steel bar 9, and the positioning steel bar 9 is completely placed in the sealed-anchor concrete, providing a tensile force for the bonding between the sealed-anchor concrete and the concrete waist beam.

[0056] Optionally, one end of the positioning steel bar 9 has a 90-degree hook, and the other end has no hook.

[0057] The direction of the positioning steel bar 9 is perpendicular to the plane where the concrete waist beam 4 is located.

[0058] The end without the hook is inserted into the concrete waist beam 4 in a straight-anchoring manner, and the end with the 90-degree hook is placed in the sealed-anchor concrete in a bent-anchoring manner.

[0059] The direction of the positioning steel bar 9 is perpendicular to the plane where the concrete waist beam 4 is located. The plane where the concrete waist beam 4 is located is an inclined plane. The sealed-anchor concrete will slide down under the influence of its own gravity on the inclined plane. The hook of the positioning steel bar 9 is used to tie the sealed-anchor concrete. The direction of the positioning steel bar 9 is perpendicular to the concrete waist beam surface, which can better form a support.

[0060] Optionally, the bottom side length of the frustum-shaped formwork is 30 cm, the top side length is 20 cm, and the height is 15 cm.

[0061] By controlling the amount of sealed-anchor concrete, on the one hand, the self-weight is reduced, the bearing pressure on the positioning steel bar 9 can be reduced, and on the other hand, materials can be saved.

[0062] Optionally, the small groove opened on the PVC pipe 1 corresponds to the protruding position of the data line 6 of the anchor rod load cell 2.

[0063] The length of the PVC pipe 1 is the sum of the lengths of the anchor rod load cell 2 and the anchor 5.

[0064] The size of the small groove opened on the PVC pipe 1 is slightly larger than the size of the data line 6 of the anchor rod load cell 2. The length of the PVC pipe 1 is the sum of the lengths of the anchor rod load cell 2 and the anchor 5. The PVC pipe 1 can be snap-fitted over the anchor rod load cell 2 to achieve better fixation.

[0065] Preferably, the diameter of the 4 positioning steel bars 9 is 1 cm.

[0066] Optionally, the inner diameter of the PVC pipe 1 is slightly larger than the outer diameter of the anchor rod load cell 2. The PVC pipe 1 is sleeved on the anchor rod load cell 2. After sealing the PVC pipe 1, concrete is used for sealed-anchoring. The PVC pipe 1 is tightly combined with the anchor rod load cell 2 to ensure the overall stability.

[0067] Optionally, use foaming glue 7 to seal the pipe orifice at one end of the PVC pipe 1 away from the steel backing plate 3. The foaming glue 7 has good filling, sealing, and bonding properties. During the sealing operation, as the first sealing barrier, it plays a role in isolating the concrete from contacting the anchor rod dynamometer 2.

[0068] Optionally, when using the transparent tape 8 to seal the small groove and the foaming glue 7, the transparent tape 8 should be sealed at least in two layers. The transparent tape 8 isolates the concrete from contacting the anchor rod dynamometer 2 during the anchor sealing operation, playing a role in protecting the anchor rod dynamometer 2. At the same time, the corrosive substances contained in the concrete will erode the transparent tape 8. The double-layer design can ensure that the concrete does not erode the anchor rod dynamometer 2 before solidification.

[0069] Optionally, the weight ratio of the ingredients for the concrete is as follows: the ratio of water:cement:sand:stone is 0.4:1:1.5:1.8;

[0070] The anchor sealing concrete is a non-load-bearing structure, only used to protect the anchor rod dynamometer 2 from corrosion. At the same time, the anchor sealing concrete is located on the inclined surface of the concrete waist beam 4. The concrete prepared with the above weight ratio, compared with standard concrete, reduces the amount of stone and increases the amount of sand;

[0071] The above weight ratio is the data obtained from experiments, which reduces the weight of the anchor sealing concrete structure, improves the fluidity and bonding property of the concrete. During the construction operation, the concrete can be better formed, increasing the bonding force between the anchor sealing concrete and the concrete waist beam 4, and also saving materials. While completing the anchor sealing operation and ensuring the construction quality, it also increases the economic benefits.

[0072] After the anchor head of the prestressed anchor rod is sealed according to the method described above, the anchor rod dynamometer 2 is sleeved with a PVC pipe 1 and covered with a frustum-shaped concrete structure. The frustum-shaped concrete structure forms an integral body with the concrete waist beam 4 through the positioning steel bars 9 and its own bonding property, playing a role in protecting the anchor rod dynamometer 2 from wind and rain erosion.

[0073] As described above, the present invention can be preferably realized.

[0074] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that several improvements and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A method for protecting a bolt axial force meter when grouting the anchor head, characterized in that, The following steps are involved: S1: Drill holes in the concrete waist beam (4) around the anchor axial force gauge (2) and insert four positioning steel bars (9) with a diameter of 0.8-1.2 cm; S2: A quadrangular pyramid-shaped formwork is set up on the outer ring of the four positioning steel bars (9), the quadrangular pyramid-shaped formwork is supported by a movable bracket placed on the ground, an opening is arranged on the upper part of the quadrangular pyramid-shaped formwork, and a movable guide groove is provided, and the positions of the four positioning steel bars (9) correspond to the positions of the four corners of the quadrilateral on the top surface of the quadrangular pyramid-shaped formwork; S3: Open a small groove on the PVC pipe (1); S4: Put the PVC tube (1) on the anchor axial force gauge (2), and the end of the PVC tube (1) with a small groove is in contact with the steel pad (3); S5: Use transparent tape (8) to tightly seal the small groove on the PVC tube (1); S6: Use foam glue (7) to seal the end of the PVC pipe (1) away from the steel pad (3), and use transparent tape (8) to seal the outside of the foam glue (7) again; S7: Finally, the guide groove is used to inject concrete into the tetrahedral formwork through the opening, and then the opening is sealed. After the concrete solidifies naturally, the movable bracket is removed, and the tetrahedral formwork is dismantled, and the anchor sealing operation is completed.

2. The method according to claim 1, characterized in that One end of the positioning steel bar (9) is provided with a 90-degree hook, and the other end is not provided with a hook; The direction of the positioning steel bars (9) is perpendicular to the surface where the concrete waist beam (4) is located; The end without the hook is inserted into the concrete waist beam (4) in a straight anchoring manner, and the end with the 90-degree hook is placed in the anchoring concrete in a bent anchoring manner.

3. The method according to claim 1, wherein The bottom side of the quadrangular pyramid-shaped mold shell is 30 cm long, the top side is 20 cm long, and the height is 15 cm.

4. The method according to claim 1, characterized in that The small groove formed on the PVC tube (1) corresponds to the raised position of the data line of the anchor axial force meter (2), and the size of the small groove formed on the PVC tube (1) is slightly larger than the size of the data line of the anchor axial force meter (2).

5. The method according to claim 1, characterized in that The diameter of the four positioning steel bars (9) is 1 cm.

6. The method according to claim 1, wherein The inner diameter of the PVC tube (1) is slightly larger than the outer diameter of the anchor axial force gauge (2); The length of the PVC pipe (1) is the length of the anchor rod axial force gauge (2) plus the anchor (5).

7. The method according to claim 1, characterized in that, When the transparent tape (8) is used to seal the small groove and the foam glue (7), the transparent tape should be sealed with at least two layers.

8. The method according to claim 1, wherein The weight ratio of the concrete ingredients is 0.4:1:1.5:1.8 for water:cement:sand:gravel.

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