CN110541417A - Anchor cable for continuous basalt fiber composite reinforcement - Google Patents

Abstract

An anchor cable for continuous basalt fiber composite reinforcement, including grouting pipe (1), steel hinge wire (6), prestressed anchorage, continuous basalt fiber composite tendon (2), flange connection structure and PVC tube (12). The anchor cable connects the continuous basalt fiber composite tendon and the steel hinge wire through the flange connection structure and the prestressed anchor; the continuous basalt fiber composite tendon passes through a plurality of evenly distributed positioning centering devices 3) Installed in a PVC pipe; the grouting pipe is embedded with a cut anchor grout pipe, and the anchor grout enters the flange from this pipe to tightly connect the continuous basalt fiber composite tendons and steel strands together. The continuous basalt fiber composite reinforcement anchor cable provided by the invention can replace steel strands, high-strength steel wires, etc. During engineering construction, it is easier to cut the remaining anchor cable steel in the soil layer.

Description

Anchor cable for continuous basalt fiber composite reinforcement

technical field

The invention relates to an anchor cable of continuous basalt fiber composite reinforcement, which belongs to the technical field of civil engineering.

Background technique

With the development of the times, people's demand for underground space is increasing, thus increasing the construction of underground projects. Foundation pit support engineering is an important part of underground engineering. Usually, anchor cables can be used to reinforce the soil around the foundation pit. At present, most of the anchor cables used are steel bars and steel strands. The corrosion resistance of steel anchor cables is relatively poor, and additional anti-corrosion procedures are often required, and the construction is more complicated; moreover, the anchor cables are not easy to recycle, and are generally left in the soil layer. For the surrounding projects in the later stage, such obstacles are encountered during construction. , It is very inconvenient to cut steel strands, which brings difficulties to the construction.

Basalt fiber is an inorganic non-metallic fiber with comprehensive properties such as high strength, good durability, corrosion resistance (acid and alkali resistance), and moderate cost performance. It is an economical, green and high-performance material. Basalt fiber composite reinforcement is a new type of building material that is made of high-strength basalt fiber plus vinyl resin (epoxy resin), and is pultruded, wound, surface coated, composite formed, and continuously produced through a production line. The expansion coefficient of basalt fiber composite bars is similar to that of concrete, and there will be no large temperature stress between the two; its tensile strength is about 3 times that of steel bars, and its density is only about 1/3 of that of steel bars. Especially a kind of continuous basalt fiber (CBF), which has weak shear resistance and is easy to cut, which is convenient for the construction of surrounding projects in the later stage.

Contents of the invention

The purpose of the present invention is to solve the problems that the steel strands of the anchor cables are difficult to remove and the like encountered in the construction process of the surrounding projects in the later period. The present invention proposes an anchor cable of continuous basalt fiber composite reinforcement.

The technical scheme that the present invention realizes is as follows, a kind of anchor cable of continuous basalt fiber composite reinforcement, comprises grouting pipe, steel hinge wire and the anchorage that applies prestress; Also comprises continuous basalt fiber composite tendon, flange connection structure and PVC pipe. The anchor cable connects the continuous basalt fiber composite tendon and the steel hinge wire through the flange connection structure and the prestressed anchor; the continuous basalt fiber composite tendon passes through a plurality of evenly distributed positioning centering devices Installed in a PVC pipe; the grouting pipe is embedded with a cut anchor grout pipe, and the anchor grout enters the flange from this pipe to tightly connect the continuous basalt fiber composite tendons and steel strands together.

The flange connection structure is composed of a pair of identical flanges and two identical anchorages, and the two anchorages are respectively installed in the two flanges; one anchorage is connected to the continuous basalt fiber composite tendon and the grouting pipe; Another anchor connects the strands.

The flange is composed of a pair of flanges, a pair of steel sleeves, a pair of flares and a rubber gasket; it is fixed by four bolts; the flares are embedded and fixed in the circular hole in the center of the flange, and the steel sleeve The cylinder is embedded in the center hole of the flare, and the anchor is placed in the flare of the flange to form the left connection structure of the flange; the same flare, flange plate, steel sleeve, and anchor constitute the right connection structure of the flange; The left connection structure of the flange and the right connection structure of the flange are relatively closed, and a rubber gasket is placed in the middle, and aligned with the mounting holes of the two flanges, and the left and right connection structures of the flange are connected into a whole by bolts and nuts.

The anchors are placed in the flaring of the flange. When the flange is used, the two anchors in the flange are connected to the continuous basalt fiber composite tendons, grouting pipes and steel strands in advance; the interior is filled with epoxy The resin-type anchoring glue makes the continuous basalt fiber composite tendons, grouting pipes and steel strands more closely connected with the anchorage.

The fixing of the continuous basalt fiber composite tendons and steel strands passing through the anchorage adopts a clip structure, that is, after the two clips clamp the continuous basalt fiber composite tendons or steel strands, the small diameter of the clips The end is directly embedded in the anchor hole.

The positioning centering device is cylindrical in shape, and contains a plurality of through holes in the axial direction of the positioning centering device. There is a grouting pipe hole in the center, and a plurality of continuous basalt fiber composite tendon holes are evenly distributed around.

The prestressed anchor is composed of a backing plate, an anchor ring and a clip; the interior of the anchor ring and the clip is roughened; the clip is divided into two from the central axis by a round table with an axial inner hole After the two clips clamp the steel strand, they are embedded in the anchor ring, so that the steel strand is installed and fixed in the anchor, and the other end of the anchor is installed on the backing plate.

The anchoring section of the grouting pipe is evenly distributed with quincunx-shaped grouting holes; the grouting pipe head to the flange part is embedded with a small-diameter anchoring grouting pipe.

The continuous basalt fiber composite tendons are scattered and arranged around the grouting pipe, and connected and fixed by a positioning centering device.

A kind of anchor cable of continuous basalt fiber composite reinforcement, its preparation method steps are as follows:

(1) Prepare materials. Including continuous basalt fiber composite tendons, grouting pipes, steel hinge wires, prestressed anchor fittings, flange connection structural fittings, positioning centering devices and PVC pipes.

Determine the number of continuous basalt fiber composite tendons, and select the corresponding anchorage and positioning centering device.

(2) Determine a certain length of continuous basalt fiber composite tendons and grouting pipes, insert the continuous basalt fiber composite tendons and grouting pipes into the corresponding holes of multiple positioning centering devices in sequence; insert the grouting pipes into the center hole, and continuously The basalt fiber composite tendons are evenly distributed in the hole in the outer circumference area of the central hole; the positioning centering device connects the continuous basalt fiber composite tendons scattered around the grouting pipe and the grouting pipe into a whole;

(3) Insert the continuous basalt fiber composite tendon and grouting pipe installed in multiple positioning centering devices into the PVC pipe; multiple positioning centering devices are evenly distributed in the length direction of the continuous basalt fiber composite tendon and grouting pipe Above; the grouting pipe protrudes from one end of the PVC pipe, and a small-diameter anchoring grouting pipe is embedded from the head of the grouting pipe to the flange;

(4) At the other end of the PVC pipe, the protruding continuous basalt fiber composite tendons and one end of the grouting pipe are embedded with steel sleeves, flares and flanges, and pass through the corresponding holes of the anchorage. Each continuous After the basalt fiber composite reinforcement is clamped by a pair of clips, it is embedded back into the anchorage hole, and one end of the continuous basalt fiber composite reinforcement is fixed in the anchorage to form a half-flange connection structure;

(5) Embed one end of the steel hinge line into the steel sleeve, flaring and flange; pass through the corresponding hole of the anchorage, clamped by a pair of clips, insert it back into the hole of the anchorage, and insert the steel One end of the hinge line is fixed in the anchor to form the other half of the flange connection structure;

(6) The other end of the steel hinge wire passes through the backing plate, is clamped by a pair of clips, embedded in the anchor ring, and one end of the steel hinge wire is fixed in the prestressed anchor;

(7) Close the half flange connection structure installed with continuous basalt fiber composite tendons and the half flange connection structure installed with steel hinge lines, insert rubber gaskets in the middle, and integrate the flange connection structure with bolts;

(8) An anchoring grout pipe is embedded in the grouting pipe, and the anchoring grout enters the flange from this pipe to tightly connect the continuous basalt fiber composite tendons and steel strands together.

The beneficial effect of the present invention is that the continuous basalt fiber composite reinforcement anchor cable provided by the present invention can replace steel strands, high-strength steel wires, etc. as the main tensile reinforcement; while meeting the tensile strength required by the project, it also has The lower shear strength makes it easier to cut the remaining anchor cable steel in the soil layer during the later surrounding engineering construction. The use of steel strands instead of continuous basalt fiber composite tendons at prestressed anchorages can prevent continuous basalt fiber composite tendons from being sheared when prestressed. In addition, the invention also has the advantages of light weight, high strength, convenient transportation, corrosion resistance and good durability.

Description of drawings

Fig. 1 is the structural representation of continuous basalt fiber composite bar anchor cable of the present invention;

Fig. 2 is a schematic view of the structure of the grouting pipe of the present invention; Fig. 3 is a schematic view of the structure of the grouting pipe;

Fig. 4 is a schematic diagram of the anchorage structure; Fig. 5 is a schematic diagram of the clamp block structure;

Fig. 6 is a schematic diagram of the structure of the anchor ring; Fig. 7 is a schematic diagram of the structure of the backing plate;

Fig. 8 is a structural schematic diagram of a positioning centering device; Fig. 9 is a schematic structural diagram of a flange;

Figure 9 (a) is a schematic diagram of the installation structure of the flange and the flare;

Figure 9(b) is a schematic diagram of the structure of the steel sleeve;

Figure 9(c) is a schematic diagram of the flaring structure;

Figure 9(d) is a schematic diagram of the structure of the rubber gasket;

In the figure, 1 is the grouting pipe; 2 is the continuous basalt fiber composite tendon; 3 is the positioning centering device, 3-1 is the continuous basalt fiber composite tendon hole, 3-2 is the grouting pipe hole; 4 is the anchor ;5 is flange; 5-1 is flange, 5-2 is steel sleeve, 5-3 is flaring, 5-4 is rubber gasket, 5-5 is bolt and nut; 5-6 is flange Plate installation hole; 6 is steel strand; 7 is spiral reinforcement; 8 is backing plate; 9 is anchor ring; 10 is clip; 11 is steel sleeve; 12 is PVC pipe; 13 is grout injection pipe; 14 For the pulp hole.

Detailed ways

The anchor cable of a kind of continuous basalt fiber composite reinforcement of the present embodiment is shown in Figure 1, and the anchor cable of a kind of continuous basalt fiber composite reinforcement provided by the present embodiment is composed of multiple continuous basalt fiber composite tendons 2 and a plurality of The positioning centering device consists of 3 components. The positioning centering device 3 connects the continuous basalt fiber composite tendons 2 scattered around the grouting pipe 1 and the grouting pipe 1 into a whole.

As shown in Fig. 2 and Fig. 3, the grouting pipe 1 of the anchor cable in this embodiment is evenly distributed on the pipe body of the anchor section with plum blossom-shaped grouting holes 1-1, and the part from the head of the grouting pipe 1 to the flange 5 is embedded with a small diameter Anchor slurry injection pipe 13, from which the anchor slurry enters the inside of flange 5 to tightly connect continuous basalt fiber composite tendon 2 and steel strand 6 together. The anchoring slurry can use epoxy resin anchoring glue.

As shown in FIGS. 4 to 7 , the anchorage at the place where the anchor cable is prestressed in this embodiment consists of a backing plate 8 , an anchor ring 9 and a clip 10 . The interior of the anchor ring 9 and the clip 10 is roughened.

As shown in Fig. 8, the center of the positioning centering device 3 used in this embodiment is the grouting pipe hole 3-2, and the continuous basalt fiber composite tendon holes 3-1 are evenly distributed around the grouting pipe hole 3-2. Wherein, the number of continuous basalt fiber composite tendon holes 3-2 is determined according to actual engineering conditions.

As shown in Figure 9, the flange used in this embodiment consists of a pair of flanges 9-1, a pair of steel sleeves 9-2, a pair of flared openings 9-3 and a rubber gasket 9-4. Four bolts 9-5 are fixed.

The anchor cable of a kind of continuous basalt fiber composite reinforcement of the present embodiment, its preparation method steps are as follows:

(1) Prepare materials. It includes continuous basalt fiber composite tendon 2, grouting pipe 1, steel hinge wire 6, prestressed anchor fittings, flange connection structural fittings, positioning centering device and PVC pipe 12.

Determine the number of continuous basalt fiber composite tendons 2, and select the corresponding anchorage 4 and positioning centering device 3.

(2) Determine a certain length of continuous basalt fiber composite tendon and grouting pipe, insert the continuous basalt fiber composite tendon 2 and grouting pipe 1 into the corresponding holes of multiple positioning centering devices 3 in sequence; insert grouting pipe 1 into In the center hole, the continuous basalt fiber composite tendons 2 are evenly distributed in the hole in the outer circumference area of the center hole; the positioning centering device 3 connects the continuous basalt fiber composite tendons 2 scattered around the grouting pipe 1 to the grouting pipe 1 into a whole.

(3) Insert the continuous basalt fiber composite tendon 2 and the grouting pipe 1 installed on multiple positioning centering devices 3 into the PVC pipe 12; multiple positioning centering devices 3 are evenly distributed between the continuous basalt fiber composite tendon 2 and the In the length direction of the grouting pipe 1 ; the grouting pipe 1 protrudes from one end of the PVC pipe 12 , and the small-diameter anchoring grouting pipe 13 is embedded in the part from the head of the grouting pipe 1 to the flange 5 .

(4) At the other end of the PVC pipe 12, the protruding continuous basalt fiber composite tendon 2 and one end of the grouting pipe 1 are embedded with the steel sleeve 5-2, flared mouth 5-3 and flange 5-1, Pass through the corresponding hole of the anchorage 4, and after each continuous basalt fiber composite bar 2 is clamped by a pair of clips 10, insert it back into the anchorage hole, and fix one end of the continuous basalt fiber composite bar 2 in the anchorage 4 , forming a half-flange connection structure.

(5) Insert one end of the steel hinge wire into the steel sleeve 5-2, flare 5-3 and flange 5-1; pass through the corresponding hole of the anchorage 4, and clamp it by a pair of clips 10 , inserted back into the anchorage hole, and one end of the steel hinge wire is fixed in the anchorage 4 to form the other half of the flange connection structure.

(6) The other end of the steel hinge 6 passes through the backing plate 8 and is clamped by a pair of clips 10, then embedded in the anchor ring 9, and one end of the steel hinge 6 is fixed in the prestressed anchor.

(7) Close the half flange connection structure installed with continuous basalt fiber composite tendon 2 and the half flange connection structure installed with steel hinge line 6, insert rubber gasket 5-4 in the middle, and use bolt 5-5 to secure The connection structure of the flange 5 is integrated.

(8) An anchoring grout pipe 13 is embedded in the grouting pipe 1, and the anchoring grout enters the flange 5 from this pipe to tightly connect the continuous basalt fiber composite tendon 2 and the steel strand 6 together.

To sum up, the anchor cable provided in this example uses continuous basalt fiber composite tendons as the main tensile material, and is connected and positioned using a positioning centering device. Steel strands are used instead of continuous basalt fiber composite tendons at the place where the prestress is applied, so as to avoid shear failure or fail to reach the prestress design value. The anchor cable provided by this embodiment has the advantages of high tensile strength, low quality, low shear strength, and easy cutting, and can better solve the obstacle problem caused by the anchor cable left in the soil layer to other engineering constructions.

Claims (10)

1. An anchor cable of a continuous basalt fiber composite reinforcement, comprising a grouting pipe, a steel strand and an anchorage for prestressing; it is characterized in that it also includes a continuous basalt fiber composite tendon, a flange connection structure and a PVC pipe The anchor cable connects the continuous basalt fiber composite tendon and the steel hinge wire through the flange connection structure and the prestressed anchorage; the continuous basalt fiber composite tendon is centered through a plurality of uniformly distributed The device is installed in the PVC pipe; the grouting pipe is embedded with a cut anchor grout pipe, and the anchor grout enters the flange from this pipe to tightly connect the continuous basalt fiber composite tendon and the steel strand. 2. the anchor cable of a kind of continuous basalt fiber composite reinforcement according to claim 1, is characterized in that, described flange connection structure is made up of a pair of identical flanges and two identical anchorages, two anchors The anchors are respectively installed in the two flanges; one anchor is connected to the continuous basalt fiber composite tendon and the grouting pipe; the other anchor is connected to the steel strand. 3. the anchor cable of a kind of continuous basalt fiber composite bar according to claim 2, is characterized in that, described flange is made of a pair of flanges, a pair of steel sleeves, a pair of flaring and a rubber washer Composition; fixed by four bolts; the flaring is embedded and fixed in the round hole of the central step of the flange, the steel sleeve is embedded in the central hole of the flaring, and the anchor is placed in the flaring of the flange to form the left connection structure of the flange ;The same flaring, flange, steel sleeve and anchor constitute the right connection structure of the flange; The mounting holes of the two flanges are used to connect the left and right connection structures of the flanges into a whole through bolts and nuts. 4. The anchor cable of a kind of continuous basalt fiber composite reinforcement according to claim 3, characterized in that, the anchor is placed in the flared opening of the flange, and when the flange is used, two The anchors are respectively connected to the continuous basalt fiber composite tendons, grouting pipes and steel strands; the interior is filled with epoxy resin anchoring glue so that the continuous basalt fiber composite tendons, grouting pipes and steel strands are connected to the anchorage. more closely. 5. The anchor cable of a kind of continuous basalt fiber composite reinforcement according to claim 3, characterized in that, the fixing of the continuous basalt fiber composite tendon and steel strand passing through the anchorage adopts a clip structure , that is, after the two clips clamp the continuous basalt fiber composite tendon or steel strand, the small diameter end of the clip is directly embedded in the anchorage hole. 6. The anchor cable of a kind of continuous basalt fiber composite reinforcement according to claim 1, characterized in that, the shape of the positioning centering device is cylindrical, and contains a plurality of through holes in the axial direction of the positioning centering device , there is a grouting pipe hole in the center, and a number of continuous basalt fiber composite tendon holes are evenly distributed around. 7. the anchor cable of a kind of continuous basalt fiber composite reinforcement according to claim 1, is characterized in that, the described anchor tool that applies prestress is made up of backing plate, anchor ring and clip; anchor ring and clip inside Roughening treatment; the clip is made of a round platform with an axial inner hole cut into two from the direction of the central axis; after the two clips clamp the steel strand, they are embedded in the anchor ring, so that the steel strand is installed and fixed on the In the anchorage, the other end of the anchorage is installed on the backing plate. 8. The anchor cable of a kind of continuous basalt fiber composite reinforcement according to claim 1, characterized in that, the anchoring section of the grouting pipe is evenly distributed with quincunx-shaped grouting holes; the head of the grouting pipe reaches the flange part Embed small diameter anchoring grout pipe. 9 . The anchor cable of a continuous basalt fiber composite reinforcement according to claim 1 , wherein the continuous basalt fiber composite tendons are dispersedly arranged around the grouting pipe and connected and fixed by a positioning centering device. 10. the anchor cable of a kind of continuous basalt fiber composite reinforcement according to claim 1, is characterized in that, described anchor cable preparation method step is as follows: (1) Material preparation, including continuous basalt fiber composite tendons, grouting pipes, steel hinge wires, prestressed anchor fittings, flange connection structural fittings, positioning centering devices and PVC pipes; Determine the number of continuous basalt fiber composite tendons, select the corresponding anchorage and positioning centering device; (2) Determine a certain length of continuous basalt fiber composite tendons and grouting pipes, insert the continuous basalt fiber composite tendons and grouting pipes into the corresponding holes of multiple positioning centering devices in sequence; insert the grouting pipes into the center hole, and continuously The basalt fiber composite tendons are evenly distributed in the hole in the outer circumference area of the central hole; the positioning centering device connects the continuous basalt fiber composite tendons scattered around the grouting pipe and the grouting pipe into a whole; (3) Insert the continuous basalt fiber composite tendon and grouting pipe installed in multiple positioning centering devices into the PVC pipe; multiple positioning centering devices are evenly distributed in the length direction of the continuous basalt fiber composite tendon and grouting pipe Above; the grouting pipe protrudes from one end of the PVC pipe, and a small-diameter anchoring grouting pipe is embedded from the head of the grouting pipe to the flange; (4) At the other end of the PVC pipe, the protruding continuous basalt fiber composite tendons and one end of the grouting pipe are embedded with steel sleeves, flares and flanges, and pass through the corresponding holes of the anchorage. Each continuous After the basalt fiber composite reinforcement is clamped by a pair of clips, it is inserted back into the anchor hole, and one end of the continuous basalt fiber composite reinforcement is fixed in the anchor to form a half flange connection structure; (5) Embed one end of the steel hinge line into the steel sleeve, flaring and flange; pass through the corresponding hole of the anchorage, clamped by a pair of clips, insert it back into the hole of the anchorage, and insert the steel One end of the hinge line is fixed in the anchor to form the other half of the flange connection structure; (6) The other end of the steel hinge wire passes through the backing plate, is clamped by a pair of clips, embedded in the anchor ring, and one end of the steel hinge wire is fixed in the prestressed anchor; (7) Close the half flange connection structure installed with continuous basalt fiber composite tendons and the half flange connection structure installed with steel hinge lines, insert rubber gaskets in the middle, and integrate the flange connection structure with bolts; (8) An anchoring grout pipe is embedded in the grouting pipe, and the anchoring grout enters the flange from this pipe to tightly connect the continuous basalt fiber composite tendons and steel strands together.