A tunnel combined anchor rod and surface anticorrosion treatment method thereof

Abstract

The present invention provides a tunnel composite anchor and a surface anticorrosion treatment method thereof. The tunnel composite anchor of the present invention comprises a solid rod body, a pad, a grease injection tube, a nut, a hollow rod body, a grouting tube, a connecting tube and a self-anchoring anchor head. The solid rod body comprises a mounting end and a connecting end, and a pad and a nut are sequentially sleeved and installed on the mounting end; a first mounting hole and a second mounting hole are provided on the pad; the grease injection tube comprises a first end and a second end, and the first end is installed on the pad; a third mounting hole is provided on the connecting tube, and the connecting tube comprises a third end and a fourth end, one end of the grouting tube is connected and installed on the third end, and the connecting end is threadedly installed on the third end; the self-anchoring anchor head comprises a mounting portion and a flaring portion, and the flaring portion is flared in the direction of the pad, one end of the hollow rod body is threadedly installed on the fourth end, and the other end of the hollow rod body is threadedly installed on the mounting portion. The tunnel composite anchor of the present invention has a stronger anchoring force with the surrounding rock and the grouting mortar.

Description

Technical Field

[0001] The invention relates to a tunnel anti-corrosion combined anchor rod and a surface anti-corrosion treatment method thereof. Background Art

[0002] As an important form of geotechnical engineering reinforcement, anchor support has been increasingly used in the international geotechnical engineering field due to its advantages of safety, high efficiency and low cost. Railway tunnel anchor support projects mostly use hollow anchors and combined anchors. Hollow anchors are used for slope and foundation pit support, and combined anchors are used for tunnel vault support. Through pressure grouting of the anchor body, it is possible to consolidate the broken rock mass, improve the rock mass, cut off groundwater and prevent the corrosion of the rod body, thereby achieving a good support purpose.

[0003] However, the current anchor rods will corrode and cause the problem of reduced anchoring force. Summary of the invention

[0004] In order to overcome the aforementioned defects, the present invention provides a tunnel combination anchor rod and a surface anti-corrosion treatment method thereof. The characteristics of the tunnel combination anchor rod of the present invention are as follows: Different from the parallel expansion of the existing shell-type anchor head, the anchor head of the anchor rod of the present invention has a certain angle with the anchor rod and opens outward, and the anchoring force with the surrounding rock and the grouting mortar is stronger. The anchor rod injects the grouting material into the hollow anchor rod through the grouting pipe. After the hollow anchor rod is overflowing, the grouting material fills the anchor hole from the inside to the outside, which is efficient, easy to grout, and has a large anchoring force. No exhaust pipe is required, which solves the problems of slow grouting and low work efficiency. The present invention adopts multi-element powder co-infiltration + passivation film composite anti-corrosion treatment technology to solve the problem of reduced anchoring force caused by rusting of steel rods.

[0005] The present invention is achieved through the following technical solutions:

[0006] On the one hand, the present invention provides a tunnel composite anchor, comprising a solid rod body, a pad, a grease injection tube, a nut, a hollow rod body, a grouting tube, a connecting tube and a self-anchoring anchor head, wherein:

[0007] The solid rod body comprises a mounting end and a connecting end which are arranged opposite to each other, the mounting end is sleeved with the pad and the nut in sequence, and the pad faces the connecting end, and the pad and the nut are both threadedly mounted on the solid rod body;

[0008] The backing plate is provided with a first mounting hole for the grease injection pipe to pass through and a second mounting hole for the grouting pipe to pass through;

[0009] The grease injection tube comprises a first end and a second end which are arranged opposite to each other. After the first end passes through the first mounting hole, the second end is mounted on the backing plate, and the end surface of the second end is used to communicate with the injection pump.

[0010] The connecting pipe is provided with a third mounting hole, the connecting pipe comprises a third end and a fourth end which are arranged opposite to each other, one end of the grouting pipe passes through the second mounting hole and the third mounting hole and is connected and mounted on the third end, and the connecting end is threadedly mounted on the third end;

[0011] The self-anchoring anchor head includes a mounting portion and a flaring portion, the mounting portion is provided with an overflow hole, the flaring portion is flared toward the direction of the pad, the flaring portion includes a first inclined plate and a second inclined plate, a first angle is formed between the first inclined plate and the solid rod body, a second angle is formed between the second inclined plate and the solid rod body, one end of the hollow rod body is threadedly mounted on the fourth end, and the other end of the hollow rod body is threadedly mounted on the mounting portion and is communicated with the overflow hole.

[0012] Preferably, the number of the grouting pipes is greater than or equal to two.

[0013] Preferably, the first angle is 10°-30°, and the second angle is 10°-30°.

[0014] Preferably, outer surfaces of the solid rod body, the backing plate, the hollow rod body, the connecting pipe and the nut are all subjected to anti-corrosion treatment.

[0015] Preferably, the solid rod body is a hot-rolled ribbed steel bar or a precision-rolled threaded steel bar.

[0016] Preferably, the hollow rod body is a fully threaded steel pipe.

[0017] Preferably, the grease injection tube and the grouting tube are both made of plastic.

[0018] Preferably, the connecting pipe is made of 45# steel or 40Cr# steel, and the nut is made of 45# steel or 40Cr# steel.

[0019] Preferably, the material of the pad is No. 45 steel or Q355 steel.

[0020] Preferably, the pad is a square plate or a circular plate.

[0021] On the other hand, the present invention provides a surface anticorrosion treatment method for an anchor rod, the method comprising performing co-infiltration and / or spraying or immersing a passivation liquid on the surface of the anchor rod to form a co-infiltration layer and a passivation layer. After the anchor rod is treated by the method, a multi-layer anticorrosion layer (co-infiltration layer + passivation layer + mortar layer) is formed, so that the anchor rod has good durability in the surrounding rock, achieving the purpose of long-term support.

[0022] Preferably, the multi-element powder charge consists of a multi-element powder co-infiltration agent and a penetration aid.

[0023] Preferably, the penetration aid is 5-20% of the mass of the multi-element powder co-penetration agent.

[0024] Preferably, in terms of mass content, the content of each element in the multi-element powder co-penetrating agent is as follows: Al accounts for 0.1-6%, Mg accounts for 0-0.3%, Ni accounts for 0-5%, rare earth accounts for 0.05-0.7%, and the balance is zinc. The mesh size of the co-penetrating agent is 300-350 mesh. The multi-element powder co-penetrating agent of the present invention is mainly zinc. A large amount of aluminum reacts with the strong alkaline cement mortar to generate gas, which then forms pores on the surface of the mortar, affecting the bond strength between the anchor rod and the mortar. A lower aluminum content can greatly improve the corrosion resistance of the anchor rod without affecting the alkali resistance of the anchor rod and the bond strength with the mortar. Therefore, the aluminum element in the co-penetrating layer is controlled at 6% or less.

[0025] Preferably, Zn, Ni, Al and Mg in the multi-element powder co-infiltration agent are zinc powder, ZnAl 15 、AlMg5、NiAl 20 Alloy powder provided.

[0026] Preferably, the penetration enhancer comprises 60% to 75% NH4Cl, and the remainder is quartz sand, and the particle size of the quartz sand is 80 to 100 meshes.

[0027] The passivation liquid is selected from one or more of chromium-free environmentally friendly water-based passivation liquid, two-component polyurethane topcoat, water-based polyurethane topcoat, and water-based epoxy paint.

[0028] The surface of the anchor rod is subjected to factory anti-corrosion treatment, such as co-infiltration of multi-element powder charge to form a co-infiltration layer, and then sprayed or immersed in a passivation liquid to form a passivation layer. The thickness of the composite anti-corrosion layer is 70-100μm, of which the thickness of the co-infiltration layer is greater than 60μm and the thickness of the passivation layer is 5-20μm.

[0029] Wherein, preferably, the method of multi-element powder charge co-infiltration is as follows:

[0030] 1) Surface pretreatment: remove the oil stains on the surface of the anchor rod and perform shot blasting with steel shots with a diameter of 0.1-0.2 mm to expose the metal surface;

[0031] 2) placing the multi-element powder infiltration agent and the infiltration aid in a closed infiltration furnace according to a proportion, and then embedding the anchor rod in the powder, setting the rotation speed of the infiltration furnace to 6-10 r / min, installing a vacuum treatment device in the infiltration furnace, maintaining the vacuum degree at 2-5 Pa, heating the infiltration furnace to an external temperature display of 360-450° C., and installing a temperature sensor in the furnace to test the temperature of the infiltration agent to be 370-420° C., and keeping the temperature for 4-8 hours;

[0032] 3) Turn off the power supply, cool the temperature of the infiltration furnace to below 100°C, push the furnace core out to cool naturally, open the furnace cover, and separate the anchor rod from the charge.

[0033] Preferably, in step 2), the volume ratio of the powder to the volume of the infiltration furnace is 40-60L:100L;

[0034] Preferably, in step 2), the ratio of the mass of the powder to the specific surface area of ​​the anchor is 600-1000 kg:1 m 2 ;

[0035] Preferably, the method of spraying or immersing in a passivation liquid comprises the following steps:

[0036] The above passivation liquid is sprayed or immersed on all surfaces of the anchor rod after the multi-element powder charge co-infiltration for 1 to 5 minutes, and then dried at 60 to 160°C to obtain the product.

[0037] Compared with the prior art, the present invention adopts multi-element powdered charge and passivation composite anti-corrosion treatment technology to solve the problem of reduced anchoring force caused by corrosion of steel rods. Among them, the introduction of foamed polyurethane replaces the traditional grouting plug, and the polyurethane is well combined with the rod body and the surrounding rock, thereby increasing the anchoring force. The self-anchoring anchor head can be opened by tightening the screw mesh, and the expansion end of the front section of the anchor head is opened outward, with a certain angle of 10°-30° with the anchor rod, so as to achieve effective anchoring with the surrounding rock. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the combined anchor rod of the present invention.

[0039] Description of reference numerals:

[0040] 1: solid rod body; 2: pad; 3: grease injection tube; 4: nut; 5: hollow rod body; 6: grouting tube; 7: connecting tube; 8: self-anchoring anchor head; 9: mounting end; 10: connecting end; 11: mounting part; 12: flaring part; 13: first inclined plate; 14: second inclined plate; 15: first end; 16: second end; 17: third end; 18: fourth end. DETAILED DESCRIPTION

[0041] The present invention is described below with reference to specific examples. It will be appreciated by those skilled in the art that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention in any way.

[0042] The same components in the following embodiments are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0043] The experimental methods in the following examples are conventional methods unless otherwise specified. The raw materials, reagents and materials used in the following examples are commercially available products unless otherwise specified. The purchase of some reagents and raw materials is as follows:

[0044] Zinc ingot: Dongguan Kaichi Alloy Material Co., Ltd.

[0045] ZnAl l5 Alloy powder: Dongguan Kaichi Alloy Materials Co., Ltd.

[0046] AlMg5 alloy powder: Hebei Xinlizhong Nonferrous Metals Group Co., Ltd.

[0047] NiAl 20 Alloy powder: Changsha Tianjiu Technology Materials Co., Ltd.

[0048] Passivation liquid: Beijing Zhongtieke New Materials Technology Co., Ltd.

[0049] The following examples and comparative examples of the combined anchor surface anti-corrosion treatment process, the steps are as follows:

[0050] 1) Surface pretreatment: remove the surface oil stains of the anchor rod and perform shot blasting with steel shots with a diameter of 0.1 to 0.2 mm to expose the metal surface of the anchor rod;

[0051] 2) placing the multi-element powder infiltration agent and the infiltration aid in a closed infiltration furnace according to a proportion, and then embedding the anchor rod in the powder, setting the rotation speed of the infiltration furnace to 6-10 r / min, installing a vacuum treatment device in the infiltration furnace, maintaining the vacuum degree at 2-5 Pa, heating the infiltration furnace to an external temperature display of 360-450° C., and installing a temperature sensor in the furnace to test the temperature of the infiltration agent to be 370-420° C., and keeping the temperature for 4-8 hours;

[0052] 3) Turn off the power supply, cool the temperature of the infiltration furnace to below 100°C, push the furnace out to cool naturally, open the furnace cover, separate the anchor rod from the charge, and obtain the anchor rod with the infiltration layer;

[0053] Wherein, in step 2), the mass ratio of the multi-element powder co-infiltration agent to the volume of the co-infiltration furnace is 40-60 kg:100 L; the mass ratio of the powder to the specific surface area of ​​the anchor rod is 600-1000 kg:1 m 2 ; In step 3), the thickness of the co-infiltration layer is ≥60μm.

[0054] The passivation film preparation process of the following examples and comparative examples is as follows:

[0055] The above passivation liquid is sprayed or immersed on all surfaces of the anchor rod treated with multi-element powder co-penetration for 1 to 5 minutes, and then dried at 60 to 160°C to obtain the product.

[0056] Examples 1 to 4 and Comparative Examples 1 to 3 Surface treatment method of anchor rod

[0057] The raw material ratios of the multi-element powder co-infiltration agent and the infiltration aid (ammonium chloride + quartz sand) of Examples 1 to 4 are shown in Table 1, and they were prepared according to the above method. The properties are shown in Table 2.

[0058] Table 1 Formula of multi-element powder co-infiltration agent

[0059]

[0060]

[0061] Table 2 Performance measurement results of various embodiments and comparative examples

[0062]

[0063]

[0064] The Vickers hardness of the co-infiltrated layer shall be carried out according to GB / T4340.1;

[0065] Neutral salt spray resistance test is carried out according to GB / T1771;

[0066] The alkali resistance test is carried out according to GB / T1690 to determine whether there is no change in appearance;

[0067] The co-infiltration layer thickness test is carried out according to GB / T4956.

[0068] The adhesion test is carried out in accordance with GB / T 5210-2006, and the surface test is carried out on the steel plate with the same material as the anchor after co-penetration treatment.

[0069] The bond strength test with mortar is carried out in accordance with DL / T5150-2001.

[0070] The thickness of the co-infiltration layer of Examples 1-5 is 65μm or more, the hardness is 320 or more, the neutral salt spray resistance is more than 4400h without red rust, the alkali resistance is used to characterize that the mortar has no effect on the anchor rod, the adhesion characterizes the bonding strength between the infiltration layer and the anchor rod, and the bond strength with the mortar characterizes the bonding strength between the infiltration layer on the surface of the anchor rod and the mortar. The co-infiltration layers of Comparative Examples 1-3 are all below 60μm, the rare earth elements are missing in the co-infiltration agent, and the Al element is not reasonably formulated, resulting in poor neutral salt spray resistance, low hardness, unqualified alkali resistance, and low bond strength with the mortar, which seriously affects the bonding strength between the anchor rod and the mortar. The anchor rods prepared in Examples 1-5 have good anti-corrosion and mechanical properties.

[0071] Example 5

[0072] like Figure 1 As shown, the tunnel combined anchor provided by the present invention comprises a solid rod body 1, a pad 2, a grease injection tube 3, a nut 4, a hollow rod body 5, a grouting tube 6, a connecting tube 7 and a self-anchoring anchor head 8, wherein: the solid rod body 1 comprises a mounting end 9 and a connecting end 10 arranged oppositely, the mounting end 9 is sequentially sleeved with a pad 2 and a nut 4, and the pad 2 faces the connecting end 10, and the pad 2 and the nut 4 are both threadedly mounted on the solid rod body 1; the pad 2 is provided with a first mounting hole for the grease injection tube 3 to pass through and a second mounting hole for the grouting tube 6 to pass through; the grease injection tube 3 comprises a first end 15 and a second end 16 arranged oppositely, after the first end 15 passes through the first mounting hole, the second end 16 is mounted on the pad 2, and the end face of the second end 16 is used to be connected to the injection pump; the connecting A third mounting hole is provided on the tube 7, and the connecting tube 7 includes a third end 17 and a fourth end 18 which are arranged opposite to each other. One end of the grouting tube 6 passes through the second mounting hole and the third mounting hole and is connected and installed on the third end 17, and the connecting end 10 is threadedly installed on the third end 17; the self-anchoring anchor head 8 includes a mounting portion 11 and a flaring portion 12, and the mounting portion 11 is provided with an overflow hole, and the flaring portion 12 is flared in the direction of the pad 2, and the flaring portion 12 includes a first inclined plate 13 and a second inclined plate 14, and a first angle is formed between the first inclined plate 13 and the solid rod body 1, and a second angle is formed between the second inclined plate 14 and the solid rod body 1, one end of the hollow rod body 5 is threadedly installed on the fourth end 18, and the other end of the hollow rod body 5 is threadedly installed on the mounting portion 11 and is connected to the overflow hole.

[0073] It should be noted that the foamed polyurethane 19 can enter the grease injection tube 3 through the injection pump to fill the gap in the grouting space, thereby preventing the mortar from overflowing from the grouting cavity after being fully poured.

[0074] The tunnel composite anchor provided by the present invention comprises a solid rod body 1, a pad 2, a grease injection tube 3, a nut 4, a hollow rod body 5, a grouting tube 6, a connecting tube 7 and a self-anchoring anchor head 8. Mortar is poured into the grouting tube 6, and the mortar continuously overflows from the overflow hole after passing through the grouting tube 6, the connecting tube 7 and the hollow rod body 5, thereby filling the grouting space. At this time, an injection pump is used to drive the foamed polyurethane 19 into the grease injection tube 3, and the foamed polyurethane 19 flows out of the grease injection tube 3 and fills the gap in the grouting space. There is no need to set an exhaust pipe, thereby improving the pouring efficiency. The flared portion 12 in the self-anchoring anchor head 8 is flared between the hollow rod body 5, so that the anchoring force between the self-anchoring anchor head 8 and the surrounding rock and the poured mortar is enhanced, thereby improving the anchoring force between the tunnel solid anchor rod and the surrounding rock and the poured mortar.

[0075] like Figure 1 As shown, there are more than or equal to two grouting pipes 6. In this embodiment, two or more grouting pipes 6 can improve the grouting efficiency.

[0076] like Figure 1 As shown, the first angle is 10°-30°, and the second angle is 10°-30°. In this embodiment, the first inclined plate 1316 and the second inclined plate 1417 form a flared structure, and the angle in the above range can better achieve a stronger anchoring force between the self-anchoring anchor head 87 and the surrounding rock and the grouting mortar, so that the tunnel composite anchor rod is more firmly installed between the surrounding rock and the grouting mortar.

[0077] In one embodiment of the present invention, the outer surfaces of the solid rod body 1, the pad 2, the hollow rod body 5, the connecting pipe 7 and the nut 4 are all subjected to anti-corrosion treatment. It should be noted that the anti-corrosion treatment can be multi-element co-penetration anti-corrosion or zinc infiltration anti-corrosion. The solid rod body 1, the pad 2, the hollow rod body 5, the connecting pipe 7 and the nut 4 after the anti-corrosion treatment are not easily corroded, thereby avoiding the problem of reduced anchoring force of the solid rod body 1, the pad 2, the hollow rod body 5, the connecting pipe 7 and the nut 4 due to corrosion, and improving the anchoring force between the tunnel composite anchor and the surrounding rock and the grouting mortar.

[0078] In one embodiment of the present invention, the solid rod body 1 is a hot-rolled ribbed steel bar or a finely rolled threaded steel bar. The hot-rolled ribbed steel bar or the finely rolled threaded steel bar has a certain strength, and the surface of the hot-rolled ribbed steel bar or the finely rolled threaded steel bar is rolled with a full-length longitudinal rib and uniformly distributed transverse ribs, thereby strengthening the bonding between the hot-rolled ribbed steel bar or the finely rolled threaded steel bar and the mortar, and improving the anchoring force between the tunnel composite anchor and the surrounding rock and the grouting mortar.

[0079] In one embodiment of the present invention, the hollow rod body 5 is a fully threaded steel pipe. The fully threaded steel pipe has high strength and low cost, thereby increasing the service life of the hollow rod body 5 and reducing the production cost of the hollow rod body 5, thereby increasing the service life of the tunnel combination anchor rod and reducing the production cost of the tunnel combination anchor rod.

[0080] In one embodiment of the present invention, the material of the grease injection pipe 3 and the grouting pipe 6 is plastic. Plastic is cheap and has good corrosion resistance, which reduces the production cost of the grease injection pipe 3 and the grouting pipe 6 and increases the service life of the grease injection pipe 3 and the grouting pipe 6, thereby reducing the production cost of the tunnel combination anchor rod and increasing the service life of the tunnel combination anchor rod.

[0081] In one embodiment of the present invention, the material of the connecting pipe 7 is 45# steel or 40Cr# steel, and the nut 4 is 45# steel or 40Cr# steel. The connecting pipe 7 and the nut 4 made of the above materials have high strength and deformation resistance, thereby improving the service life of the connecting pipe 7 and the nut 4, and further improving the service life of the tunnel combined anchor.

[0082] In one embodiment of the present invention, the material of the backing plate 2 is 45# steel or Q355 steel. The backing plate 2 made of the above material has high strength and deformation resistance, thereby increasing the service life of the backing plate 2, and further increasing the service life of the tunnel combined anchor rod.

[0083] In one embodiment of the present invention, the backing plate 2 is a square plate or a circular plate. The backing plate 2 of the above shape is easy to process and produce, which reduces the production cost of the backing plate 2, thereby reducing the production cost of the tunnel combined anchor.

[0084] The tunnel composite anchor provided by the present invention comprises a solid rod body 1, a pad 2, a grease injection tube 3, a nut 4, a hollow rod body 5, a grouting tube 6, a connecting tube 7 and a self-anchoring anchor head 8. Mortar is poured into the grouting tube 6, and the mortar continuously overflows from the overflow hole after passing through the grouting tube 6, the connecting tube 7 and the hollow rod body 5, thereby filling the grouting space. At this time, an injection pump is used to drive the foamed polyurethane 19 into the grease injection tube 3, and the foamed polyurethane 19 flows out of the grease injection tube 3 and fills the gap in the grouting space. There is no need to set an exhaust pipe, thereby improving the pouring efficiency. The flared portion 12 in the self-anchoring anchor head 8 is flared between the hollow rod body 5, so that the anchoring force between the self-anchoring anchor head 8 and the surrounding rock and the poured mortar is enhanced, thereby improving the anchoring force between the tunnel solid anchor rod and the surrounding rock and the poured mortar.

[0085] The above description of the specific embodiments of the present invention does not limit the present invention. Those skilled in the art can make various changes or modifications based on the invention. As long as they do not depart from the spirit of the present invention, they should all fall within the scope of the claims attached to the present invention.

Claims

1. A method for treating the surface of an anchor rod for corrosion protection, the method comprising: co-infiltrating the surface of the anchor rod with a multi-element powder charge, and then spraying or immersing the surface of the anchor rod with a passivation liquid; The multi-element powder charge is composed of a multi-element powder co-infiltration agent and an infiltration aid; The method of multi-element powder charge co-infiltration is as follows: 1) Surface pretreatment: remove the oil stains on the surface of the anchor rod and perform shot blasting with steel shots with a diameter of 0.1~0.2mm to expose the metal surface; 2) The multi-element powder co-infiltration agent and the infiltration aid are placed in a closed co-infiltration furnace according to a proportion, and then the anchor rod is embedded in the powder. The rotation speed of the co-infiltration furnace is set to 6-10r / min. The co-infiltration furnace is equipped with a vacuum treatment device, and the vacuum degree is maintained at 2-5Pa. The co-infiltration furnace is heated to an external temperature display of 360-450°C. The temperature sensor in the furnace is set to test the temperature of the co-infiltration agent to be 370-420°C, and the temperature is kept for 4-8h; 3) Turn off the power supply, cool the temperature of the infiltration furnace to below 100℃, push the furnace out to cool naturally, open the furnace cover, separate the anchor rod from the charge, and you are done; The anchor rod comprises a solid rod body, a backing plate, a grease injection tube, a nut, a hollow rod body, a grouting tube, a connecting tube and a self-anchoring anchor head, wherein: The solid rod body comprises a mounting end and a connecting end which are arranged opposite to each other, the mounting end is sleeved with the pad and the nut in sequence, and the pad faces the connecting end, and the pad and the nut are both threadedly mounted on the solid rod body; The backing plate is provided with a first mounting hole for the grease injection pipe to pass through and a second mounting hole for the grouting pipe to pass through; The grease injection tube comprises a first end and a second end which are arranged opposite to each other. After the first end passes through the first mounting hole, the second end is mounted on the backing plate, and the end surface of the second end is used to communicate with the injection pump. The connecting pipe is provided with a third mounting hole, the connecting pipe comprises a third end and a fourth end which are arranged opposite to each other, one end of the grouting pipe passes through the second mounting hole and the third mounting hole and is connected and mounted on the third end, and the connecting end is threadedly mounted on the third end; The self-anchoring anchor head comprises a mounting portion and a flaring portion, wherein the mounting portion is provided with an overflow hole, the flaring portion is flared in the direction of the pad, the flaring portion comprises a first inclined plate and a second inclined plate, a first angle is formed between the first inclined plate and the solid rod body, a second angle is formed between the second inclined plate and the solid rod body, one end of the hollow rod body is threadedly mounted on the fourth end, and the other end of the hollow rod body is threadedly mounted on the mounting portion and is in communication with the overflow hole; The number of the grouting pipes is greater than or equal to two; The first angle is 10°-30°, and the second angle is 10°-30°.

2. The surface anticorrosion treatment method according to claim 1, characterized in that: The penetration aid is 5-20% of the mass of the multi-element powder co-penetration agent.

3. The surface anticorrosion treatment method according to claim 1 or 2, characterized in that: According to the mass content, the content of each element in the multi-element powder co-infiltration agent is as follows: Al accounts for 0.1-6%, Mg accounts for 0-0.3%, Ni accounts for 0-5%, rare earth accounts for 0.05-0.7%, and the balance is zinc. The mesh number of the co-infiltration agent is 300-350 mesh; The Zn, Ni, Al and Mg in the multi-element powder co-infiltration agent are zinc powder, ZnAl 15 、AlMg5、NiAl 20 Alloy powder provided.

4. The surface anticorrosion treatment method according to claim 1 or 2, characterized in that: The penetration enhancer comprises 60% to 75% NH4Cl and the remainder is quartz sand, and the particle size of the quartz sand is 80 to 100 meshes.

5. The surface anticorrosion treatment method according to claim 1 or 2, characterized in that: The passivation liquid is selected from one or more of chromium-free environmentally friendly water-based passivation liquid, two-component polyurethane topcoat, water-based polyurethane topcoat, and water-based epoxy paint.

6. The surface anticorrosion treatment method according to claim 1 or 2, characterized in that: In step 2), the volume ratio of the powder to the volume of the infiltration furnace is 40-60L:100L.

7. The surface anticorrosion treatment method according to claim 1 or 2, characterized in that: In step 2), the ratio of the mass of the powder to the specific surface area of ​​the anchor is 600-1000 kg:1 m 2 .

8. The surface anticorrosion treatment method according to claim 1 or 2, characterized in that: The method of spraying or immersing the passivation liquid comprises the following steps: Spray or immerse the above passivation liquid on all surfaces of the anchor rod after co-infiltration of multi-element powder charge for 1 to 5 minutes, and then dry at 60 to 160°C to obtain the product.

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