Construction method of an anchor pile type anchor rod support structure

Abstract

The application relates to a construction method of an anchor pile type anchor rod supporting structure, including a pile-anchor pile type anchor rod supporting structure, a multi-beam double-row pile supporting structure and a soil nail-anchor pile type anchor rod supporting structure, the construction method comprises anchor pile and wing-shaped anchor rod construction, and specifically comprises the following steps: step 1, preparation: processing and manufacturing of the anchor pile steel reinforcement cage with an anchor penetrating cylinder, a guide pipe and a water-impermeable canvas bag and the wing-shaped anchor rod with an umbrella-shaped openable anchor wing structure need to be completed; step 2, anchor pile construction; step 3, construction of the first layer of wing-shaped anchor rods; step 4, construction of the next layer of wing-shaped anchor rods; and step 5, repeating step 4 to complete wing-shaped anchor rod construction of the remaining layers. The application combines conventional anchor rod construction and anchor pile type anchor rod construction, does not need to lengthen the anchor rod, can obtain great pulling resistance through short anchor rods, guarantees supporting effect, reduces construction difficulty, and is suitable for scenes with limited building land and weak and broken rock-soil bodies.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering technology, and in particular to a construction method for an anchor pile type anchor support structure. Background Technology

[0002] In geotechnical engineering, anchor bolts (including anchor cables) are one of the most widely used technologies. The anchor bolt construction procedure involves drilling holes in the soil and rock layers, inserting the anchor bolt, grouting, and tensioning for anchoring. The anchor bolt is anchored in the soil and rock layers, and its pull-out resistance is achieved through the bond and friction between it and the surrounding soil and rock mass. In other words, the anchor bolt relies on the shear strength of the surrounding soil and rock layers to provide pull-out resistance. However, in weak soil and rock layers, the pull-out bearing capacity of the anchor bolt is low.

[0003] When the soil and rock are weak and fractured, increasing the pull-out resistance of the anchor bolts requires increasing their length, thereby increasing the anchoring area between the anchor bolts and the soil and rock. However, the longer the anchor bolts are, the more difficult the construction becomes. First, longer anchor bolt holes are prone to shrinkage or even collapse due to soil conditions. Second, the drilling efficiency of anchor bolt holes decreases exponentially with the increase of hole length. Third, the weight of the drill bit and drill rod alters the linearity of the drilling, easily producing an arc-shaped drilling trajectory. The longer the hole, the more obvious this arc-shaped trajectory becomes, thus affecting the effectiveness of the anchor bolts. Straightening the hole is not easy and will also increase additional costs.

[0004] In addition, when faced with construction scenarios where building land is limited, anchor rods cannot be used if their pull-out bearing capacity cannot be extended to meet design requirements. In other words, this extended anchor rod structure cannot be used in sites with small building boundary lines.

[0005] Anchor bolt pull-out force originates from two sources: the bond and friction between the soil and rock mass, and the anchor itself. Anchors typically provide pull-out resistance through their own weight and interaction with the surrounding soil and rock. Generally, the strength of surface soil and rock increases with depth, and the stress level is high at depth; therefore, anchors at greater depths can provide a greater ultimate pull-out force. Undoubtedly, vertical or near-vertical piles are ideal for anchoring.

[0006] Therefore, we refer to this type of pile, which provides pull-out resistance for anchor bolts, as an anchor pile. We propose an anchor pile-type anchor bolt support structure and its construction method. The emergence of anchor pile-type anchor bolts will solve the application problems of anchor bolts under adverse geological conditions and engineering constraints, greatly expanding the application environment and occasions of anchor bolts. Simultaneously, the emergence of anchor pile-type anchor bolts can also optimize or innovate current geotechnical engineering technologies, leading to new pile-anchor technologies, double-row pile technologies, and composite soil nailing technologies. Summary of the Invention

[0007] To address the challenges of constructing extended anchor bolts, their unsuitability for limited construction sites, or the limitations of conventional anchor bolt construction in weak and fractured soil and rock conditions, this invention provides a construction method for an anchor pile-type anchor support structure. This method utilizes piles as the anchor bolt's pull-out resistance carrier, leveraging the pile's high bearing capacity. A dedicated anchor bolt pre-reserved channel is established within the pile. After the anchor bolt enters the pre-reserved channel, grout is injected into the channel to firmly connect it to the pile. This structural form combines pile and anchor bolt construction, eliminating the need for extended anchor bolts, reducing construction difficulty, and enabling high pull-out resistance with a short anchor bolt. It is suitable for sites with limited building boundaries and weak, fractured soil.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A construction method for an anchor pile type anchor bolt support structure includes a pile-anchor pile type anchor bolt support structure, a multi-beam double-row pile support structure, and a soil nail-anchor pile type anchor bolt support structure. The construction method includes anchor pile construction and wing-shaped anchor bolt construction, specifically including the following steps:

[0010] Step 1: Preparation. In addition to routine construction preparation, the following steps are required: fabrication of the anchor pile reinforcement cage with anchor tube, guide pipe, and impermeable canvas bag, as well as wing-shaped anchor rods with umbrella-shaped openable anchor wings. The anchor wings of the wing-shaped anchor rods are used to connect and anchor to the anchor tube on the reinforcement cage.

[0011] Step 2, Construction of anchor piles:

[0012] Step 21: Determine the location of the anchor pile and drill to the design elevation to form the pile hole;

[0013] Step 22: Lower the completed anchor pile reinforcement cage into the pile hole, and then pour concrete. After the concrete solidifies, the single anchor pile is formed.

[0014] Step 23: Repeat steps 21-22 to complete the construction of all anchor piles, which will be arranged in rows after construction.

[0015] Step 3: Construction of Wing-Shaped Anchors: Excavation begins when the anchor piles reach the required strength or construction time. If the excavation surface is unstable, a surface layer should be constructed on the free face of the soil and rock mass. Otherwise, the surface layer should be constructed on the free face of the soil and rock mass after the first layer of wing-shaped anchors is completed. Depending on the design requirements, the surface layer can be either the soil layer between piles or a shotcrete layer. Then, the construction of the first layer of wing-shaped anchors is carried out, which means the construction of multiple wing-shaped anchors at the same layer.

[0016] Step 31: Determine the hole position of the wing-shaped anchor bolt, which will facilitate subsequent drilling of the anchor bolt hole;

[0017] Step 32, Drilling Anchor Holes: Use drilling tools to drill horizontally to the designed depth according to the above hole positions to form initial anchor holes. The anchor holes are used for inserting wing-shaped anchors. The anchor holes should correspond to the anchor tubes inside the anchor pile reinforcement cage.

[0018] Step 33, Hole cleaning after reaming: Use hydraulic, pneumatic or other methods to partially or completely ream the initial anchor bolt hole; then use hydraulic, pneumatic or other methods to remove loose soil and debris from the hole;

[0019] Step 34, Place the wing-shaped anchor bolt: First, insert the PVC pipe into the anchor bolt hole and extend it to the anchor tube position. Use the PVC pipe as the insertion channel for the wing-shaped anchor bolt. Place the wing-shaped anchor bolt with the anchor wing through the PVC pipe to the bottom of the hole, and then remove the PVC pipe. Manually operate to gradually open the anchor wing and make it stuck in the anchor tube and maintain connection with the anchor pile.

[0020] Step 35: Secondary high-pressure grouting after grouting: First, inject cement grout or other grout into the anchor bolt hole. About 2 to 3 hours after the first grouting, perform secondary high-pressure grouting. The grout is anchored together with the wing-shaped anchor bolt, completing the construction of a single wing-shaped anchor bolt.

[0021] Step 36: Repeat steps 31-35 in the same way to complete the construction of the other wing-shaped anchors on the first floor; if the surface layer has not been constructed in the early stage, the surface layer construction shall be carried out after the wing-shaped anchors on the first floor are constructed.

[0022] Step 37, Construction of the wainscoting beam: When the strength of the grouting solidified body in the multiple wing-shaped anchor rods of the first floor reaches the design requirements, the wainscoting beam is constructed on the surface layer. The wainscoting beam is connected to the head end of the multiple wing-shaped anchor rods of the first floor that have been constructed, and the wing-shaped anchor rods are tensioned and locked. At this point, the construction of the wing-shaped anchor rods at the anchorage position of the first floor is completed.

[0023] Step 4: Construction of the next layer of wing-shaped anchors: Repeat step 3 and complete the construction of multiple wing-shaped anchors in the same way for the next layer;

[0024] Step 5: Repeat step 4 in the same way until the construction of the wing-shaped anchor bolts for all remaining layers is completed, and the construction of the anchor pile type anchor bolt support structure is finally completed.

[0025] Further, in step 1, the reinforcing cage of the anchor pile is pre-installed with multiple anchor tubes arranged vertically, the specific number depending on the design requirements. The anchor tube is a pre-reserved channel within the anchor pile for the installation of wing-shaped anchor rods. The anchor tube is a hollow cylindrical structure open at both ends to facilitate the passage of the wing-shaped anchor rods, and it radially penetrates the reinforcing cage. Each anchor tube has impermeable canvas bags on both sides to seal it and prevent concrete from entering. A vertical guide pipe is installed inside the reinforcing cage of the anchor pile, connecting multiple impermeable canvas bags. High-pressure water is supplied to the impermeable canvas bags through the guide pipe to cause them to expand. The wing-shaped anchor rod includes a tie rod, an anchor head, and an anchor wing. The tie rod has the anchor head at its head and the anchor wing at its tail. The anchor wing differs from conventional anchor rod designs; its structure is similar to the opening and closing principle of an umbrella. When closed, the anchor wing can smoothly pass through the anchor tube; when opened, it engages with the anchor tube. The anchor wing opens in an umbrella shape and holds the anchor tube, which facilitates the connection between the wing-shaped anchor rod and the anchor pile. In other words, the anchor wing is the connection part between the wing-shaped anchor rod and the anchor pile.

[0026] Furthermore, in step 22, when lowering the anchor pile reinforcement cage, the opening direction of the anchor tube needs to be adjusted to facilitate the subsequent installation of the wing-shaped anchor rods, and the elevation of the reinforcement cage also needs to be adjusted. When pouring concrete, the opening direction of the anchor tube and the elevation of the reinforcement cage need to be strictly controlled to ensure the smooth construction of the wing-shaped anchor rods. When the concrete is about to cover the anchor tube, water is injected into the impermeable canvas bag through the guide pipe, causing the impermeable canvas bag inside the anchor tube to bulge outward, contact and squeeze the pile hole wall. This not only prevents concrete from entering the anchor tube, but also prevents the reinforcement cage from floating by the outward bulge of the impermeable canvas bag squeezing the pile hole wall. The concrete is poured to 0.5m above the top of the anchor pile.

[0027] Further, in step 3, when the excavation reaches 0.5m below the elevation of the corresponding anchor tube in the anchor pile, the first layer of wing-shaped anchor bolts can be constructed. After the grouting of the first layer of wing-shaped anchor bolts and before the construction of the waist beam, the surface layer construction is carried out, including the soil surface layer between piles or the shotcrete surface layer. Only when the excavation surface is unstable can the surface layer be constructed while excavating the earthwork. Anchor bolt holes are reserved on the surface layer. After the surface layer reaches the required strength, the wing-shaped anchor bolts are constructed. After the grouting of the wing-shaped anchor bolts has cured and reached the required strength, the waist beam is constructed, and the anchor bolts are tensioned and locked. In step 32, a full-length spiral drill with a diameter not exceeding 100mm or a horizontal directional drilling rig is used to drill the anchor bolt holes. The design depth of the anchor bolt holes should ensure that the wing-shaped anchor bolts can smoothly pass through the anchor tube in the anchor pile when retracted. In step 34, when the wing-shaped anchor is placed inside the PVC pipe, a sleeve pusher with a circular tube structure is inserted onto the wing-shaped anchor. The sleeve pusher is manually controlled to push the anchor wing to gradually open, and combined with pulling the wing-shaped anchor outward to make the anchor wing reach the optimal opening state. At this time, the anchor wing is stuck inside the anchor tube.

[0028] A construction method for a pile-anchor type anchor bolt support structure, based on the aforementioned construction method for an anchor pile type anchor bolt support structure, further includes the construction of a support pile row between steps 2 and 3. That is, in addition to the construction method for the anchor pile type anchor bolt support structure, a support pile row is constructed. The support pile row consists of multiple support piles arranged in a row. The construction steps for the support pile row are as follows:

[0029] First, determine the location of the single support pile hole and drill to the design elevation to form the pile hole; then, lower the steel cage of the support pile into the pile hole and pour concrete to form the pile; finally, repeat the above to complete the construction of all the support piles, forming a support pile row; construct the capping beam between the tops of the support piles.

[0030] The surface layer constructed on the free face of the rock and soil mass in step 3 includes the soil surface layer between piles. The soil surface layer between piles is a layer structure formed by cement mixed with soil and applied to the wire mesh. The wing-shaped anchor rod passes through the soil surface layer between piles and connects to the waist beam. The hole position of the wing-shaped anchor rod mentioned in step 31 is located in the rock and soil mass between two adjacent support piles and is basically in a straight line with the anchor tube of the corresponding anchor pile.

[0031] A construction method for a multi-beam double-row pile support structure, based on the above-mentioned construction method for an anchor pile type anchor rod support structure, further includes the construction of the front row of piles between steps 2 and 3. That is, in addition to the construction method for the anchor pile type anchor rod support structure, the front row of piles is also constructed. The front row of piles consists of multiple reinforced concrete piles arranged in a row. The construction steps for the front row of piles are as follows:

[0032] First, a reinforcing cage with pre-embedded hollow steel pipes is fabricated for the front row of piles. This facilitates the connection and anchoring of the wing-shaped anchor rods to the front row of piles via the hollow steel pipes. The arrangement and quantity of the hollow steel pipes are consistent with the anchor tubes inside the anchor piles. Second, the hole positions for each front row of piles are determined, and holes are drilled to the design elevation to form pile holes. Then, the reinforcing cage with hollow steel pipes is lowered into the pile hole, and concrete is poured to form the pile. During the lowering of the reinforcing cage and the pouring of concrete, the opening direction of the steel pipes and the elevation of the reinforcing cage must be strictly controlled to facilitate the subsequent construction of the wing-shaped anchor rods. Finally, the above steps are repeated to complete the construction of all the multiple front row piles. A capping beam is constructed between the tops of the front row of piles, using existing methods for capping beam construction.

[0033] The surface layer constructed on the free face of the rock and soil mass in step 3 includes the soil surface layer between piles. The wing-shaped anchor rods pass through the hollow steel pipes and are anchored to the front row of piles. After the wing-shaped anchor rods are grouted and the grout solidifies, they form a crossbeam. That is, the wing-shaped anchor rods need to be drilled. After the grout is injected into the hole and solidified, it becomes an underground connecting beam, that is, a crossbeam. Multiple wing-shaped anchor rods can form a multi-crossbeam structure after the hole is enlarged and grouted. The hole position of the wing-shaped anchor rods mentioned in step 31 is the position of the hollow steel pipe reserved in the front row of piles, which is opened up.

[0034] A construction method for a soil nail-anchor pile type anchor support structure, based on the above-mentioned construction method for an anchor pile type anchor support structure, further includes the repeated construction of soil nails in step 3. That is, on the basis of the construction method for the anchor pile type anchor support structure, soil nails are also constructed. Multiple rows of soil nail layers and multiple rows of soil nail-wing anchor mixed layers are set in the rock and soil. Soil nail construction includes soil nails in the soil nail layers and soil nails in the soil nail-wing anchor mixed layers. Multiple layers are constructed in both the soil nail layers and the soil nail-wing anchor mixed layers. In the soil nail-wing anchor mixed layers, soil nails and wing anchors are constructed alternately or at staggered times. The wing anchors in the same layer are distributed with a large spacing. There is one or more soil nails between the wing anchors. They are regularly distributed to form the soil nail-wing anchor mixed layer.

[0035] The soil nailing construction steps are as follows: First, determine the hole location and drill to the designed depth; then, lower the soil nail into the drilled hole, inject cement grout, and add grout or perform secondary grouting as required to complete the construction of a single soil nail; finally, repeat the above steps to complete the construction of all soil nails in the same layer, totaling multiple rows of several soil nails.

[0036] The surface layer constructed on the free face of the rock and soil mass in step 3 includes a shotcrete surface layer. The shotcrete surface layer is a layer structure formed by shotcrete, steel mesh and reinforcing bars. The outer end of the soil nail is connected and fixed to the reinforcing bars in the shotcrete surface layer. The wing-shaped anchor rod passes through the shotcrete surface layer and is connected to the waist beam. The construction of the next layer of wing-shaped anchor rods in step 4 also includes the construction of soil nails in the same layer. The repeated construction of soil nail layers and soil nail-wing-shaped anchor rod mixed layers in step 5 continues until the construction of soil nails and wing-shaped anchor rods in all remaining layers is completed.

[0037] The beneficial effects of the present invention through the above technical solution are:

[0038] This invention addresses the problems of limited land availability, inability to construct extended anchor bolts, or high difficulty in constructing extended anchor bolts. It proposes a construction method for anchor pile-type anchor bolt support structures. Building upon conventional anchor bolt construction, this method utilizes conventional reinforced concrete piles as the tensile support, with pre-installed anchor tubes within the piles serving as the passageways for wing-shaped anchor bolts. The wing-shaped anchor bolt is a new type of anchor bolt achieved by adding umbrella-shaped anchor wings to a conventional anchor bolt. The anchor wings of the wing-shaped anchor bolt are placed inside or pass through the anchor tube and are engaged with it. Simultaneously, the anchor tube and the wing-shaped anchor bolt are anchored together, achieving a secure connection between the wing-shaped anchor bolt and the anchor pile. The entire construction process combines anchor bolt construction with anchor pile construction, eliminating the need for extended anchor bolts, reducing construction difficulty, and improving construction efficiency.

[0039] The anchor pile type anchor of this invention provides pull-out resistance to the wing-shaped anchor through vertical anchor piles. The pull-out bearing capacity of the anchor pile type anchor mainly depends on the bearing capacity of the anchor pile. During construction, there is no need to lengthen the anchor rod; only the construction of the anchor pile needs to be considered. The bearing capacity of the anchor pile can be strengthened by its depth, length, thickness, and size, and is less related to the length of the anchor rod. Therefore, a large pull-out resistance can be obtained without lengthening the anchor rod, making it suitable for use in sites with small building boundaries and in soft soil and rock masses.

[0040] The construction method of the pile-anchor type anchor support structure of the present invention uses anchor pile type anchors to replace conventional soil anchors. The construction method of the multi-beam double-row pile support structure uses common anchor piles of anchor pile type anchors at different elevations to replace the rear row of piles. Anchor rods at different elevations and grouting solidification bodies fix and connect the front and rear rows of piles, realizing a multi-beam double-row pile support structure. This new structure significantly improves the deformation resistance compared to the conventional portal-shaped double-row pile structure with only connecting beams at the pile top. The construction method of the soil nail-anchor type anchor support structure uses soil nails + anchor pile type anchors for construction. All three construction methods of the above support structures are derived from the construction method of the anchor pile type anchor support structure and can be used in sites with small building boundaries and in soft soil and rock masses. Attached Figure Description

[0041] Figure 1 This is a construction effect diagram of the construction method of the anchor pile type anchor bolt support structure of the present invention.

[0042] Figure 2 This is a schematic diagram of the anchor pile used in the construction method of the anchor pile type anchor bolt support structure of the present invention.

[0043] Figure 3 This is a schematic diagram of the wing-shaped anchor rod and the anchor tube anchoring in the construction method of the anchor pile type anchor rod support structure of the present invention.

[0044] Figure 4 This is a schematic diagram of the installation of the impermeable canvas bag and rubber plug in the construction method of the anchor pile type anchor bolt support structure of the present invention.

[0045] Figure 5 This is a schematic diagram of the double-ribbed anchor wing opening in the construction method of the anchor pile type anchor bolt support structure of the present invention.

[0046] Figure 6 This is a schematic diagram of the single-rib anchor wing closure in the construction method of the anchor pile type anchor bolt support structure of the present invention.

[0047] Figure 7 This is a schematic diagram of the single-ribbed anchor wing opening in the construction method of the anchor pile type anchor bolt support structure of the present invention.

[0048] Figure 8 This is a top view of a construction method for a pile-anchor type anchor support structure according to the present invention.

[0049] Figure 9 This is an isometric drawing of a construction method for a pile-anchor type anchor support structure according to the present invention.

[0050] Figure 10 This invention relates to a construction method for a pile-anchor type anchor bolt support structure. Figure 8 Sectional view along the AA direction.

[0051] Figure 11 This is a top view of a construction method for a multi-beam double-row pile support structure according to the present invention.

[0052] Figure 12 This is an isometric drawing of a construction method for a multi-beam double-row pile support structure according to the present invention.

[0053] Figure 13 This invention relates to a construction method for a multi-beam double-row pile support structure. Figure 11 Sectional view along the BB direction.

[0054] Figure 14 This is a schematic diagram of the soil nail layer and the soil nail-wing anchor mixed layer arrangement in the construction method of a soil nail-anchor pile type anchor support structure of the present invention. In the figure, area ① is a schematic diagram of the soil nail and wing anchor arrangement, area ② is a schematic diagram after hanging steel mesh and setting reinforcement, and area ③ is a schematic diagram after shotcreting, setting waist beam, and tensioning and locking of wing anchor.

[0055] Figure 15 This is a construction effect diagram of the construction method of a soil nail-anchor pile type anchor support structure according to the present invention.

[0056] The attached diagram is labeled as follows: 1 Anchor pile, 3 Anchor tube, 31 Large trumpet tube, 32 Small trumpet tube, 33 Connecting pipe, 4 Wing anchor, 41 Tie rod, 42 Anchor head, 43 Anchor wing, 5 Anchor tube one, 6 Anchor tube two, 7 Anchor tube three, 8 Impermeable canvas bag, 9 Rubber plug, 10 Base plate, 11 Wing rod, 12 Tension ring, 14 Shotcrete surface layer, 15 Waist beam, 16 Support piles, 17 Crown beam, 18 Soil surface layer between piles, 19 Soil nail, 20 Pipe guide, 22 Front row piles, 23 Rear row piles, 24 Crossbeam. Detailed Implementation

[0057] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings:

[0058] A construction method for an anchor pile type anchor bolt support structure includes a pile-anchor pile type anchor bolt support structure, a multi-beam double-row pile support structure, and a soil nail-anchor pile type anchor bolt support structure. All three support structures are new types of support structures derived from the anchor pile type anchor bolt support structure. Therefore, the construction methods for these three support structures are also based on the construction method of the anchor pile type anchor bolt support structure.

[0059] Example 1:

[0060] like Figures 1-7 As shown, a construction method for an anchor pile type anchor support structure is described. This support structure consists of anchor piles 1 and wing-shaped anchors 4. The anchor piles 1 serve as the carrier for the anchor's pull-out resistance. A dedicated pre-reserved channel is created within the anchor piles 1 for the anchor to pass through. After the anchor enters the pre-reserved channel, grout is injected into the channel. Once the grout solidifies, it firmly connects the anchor to the anchor piles 1. Due to the high bearing capacity of the anchor piles 1, and the specially designed pre-reserved channel structure and the specially designed anchor tie rod 41 structure, even short anchors can achieve significant pull-out resistance.

[0061] The construction method for the entire anchor pile type anchor support structure includes two sub-items: the construction of anchor pile 1 and wing-shaped anchor 4. Its construction process and technology are basically the same as those for existing cast-in-place concrete piles and anchors. The identical processes in each step will not be repeated here; only the different process requirements will be detailed, such as... Figure 1 As shown, the specific construction method includes the following steps:

[0062] Step 1, Preparation: In addition to the usual construction preparation, it is necessary to complete the processing and fabrication of the anchor pile 1 steel cage with anchor tube 3, guide tube 20 and waterproof canvas bag 8, as well as the wing-shaped anchor rod 4 with umbrella-shaped openable anchor wing 43 structure.

[0063] The anchor pile 1 has the following structure: The anchor pile 1 includes a reinforcing cage, an anchor cylinder 3, a guide pipe 20, and a waterproof canvas bag 8, as shown below. Figure 2 As shown. Multiple anchor tubes 3 are pre-installed vertically within the reinforcing cage of the anchor pile 1, positioned at different elevations within the cage. The anchor tubes 3 serve as passageways for the wing-shaped anchor rods 4 pre-installed within the anchor pile 1. The function of the anchor tubes 3 is to allow the wing-shaped anchor rods 4 to pass through these passageways, whereby cement grout or other grout is injected to bond and solidify them with the anchor pile 1. This allows the anchor pile 1 to provide anchoring force for the wing-shaped anchor rods 4, resisting their pull-out. Figure 3 As shown.

[0064] The anchor tube 3 has the following structure: The anchor tube 3 is a hollow cylindrical structure with openings at both ends, and the anchor tube 3 radially penetrates the reinforcing cage. The anchor tube 3 includes a large trumpet tube 31, a small trumpet tube 32, and a connecting tube 33 that are interconnected. The anchor tube 3 is composed of these three components. The large trumpet tube 31 and the small trumpet tube 32 are both made of sheet metal and have a trumpet-shaped opening. The diameter of the large trumpet tube 31 is larger than the diameter of the small trumpet tube 32. The connecting tube 33 is a steel pipe structure.

[0065] The three components of the anchor tube 3 are connected and combined to create different structures, which can be selected according to construction requirements: Structure 1: The two ends of the connecting pipe 33 are respectively connected to the large trumpet pipe 31 and the small trumpet pipe 32 to form the anchor tube 1 5. Structure 2: Based on the anchor tube 1 5, the connecting pipe 33 extends into the small trumpet pipe 32 to form the anchor tube 2 6. Structure 3: One end of the connecting pipe 33 is connected to the large trumpet pipe 31, and the other end extends to the outer edge of the reinforcement cage of the anchor pile 1 to form the anchor tube 3 7.

[0066] In summary, both anchor tube 1 (5) and anchor tube 2 (6) consist of large trumpet tubes 31 and small trumpet tubes 32 at both ends, and a connecting tube 33 in the middle. The difference is that the connecting tube 33 of anchor tube 2 (6) extends into the small trumpet tube 32. Anchor tube 3 (7) does not have a small trumpet tube 32; the connecting tube 33 extends directly to the outer edge of the reinforcing cage at this end. Figure 2 As shown.

[0067] Installation of the impermeable canvas bag 8: Since the inside of the anchor tube 3 is continuous, it needs to be sealed from the outside before the wing-shaped anchor rod 4 passes through it. This means both ends of the anchor tube 3 need to be sealed to prevent the ingress of poured concrete. Therefore, each anchor tube 3 is equipped with a sealed impermeable canvas bag 8 at both ends. The impermeable canvas bag 8 is only placed inside the large horn tube 31 and the small horn tube 32. When one end of the anchor tube is a connecting pipe 33, a rubber stopper 9 is used to seal it. Figure 4 As shown.

[0068] The sealing of anchor tube 1 5 requires bonding waterproof canvas bags 8 into the large trumpet tube 31 and the small trumpet tube 32 respectively; the sealing method of anchor tube 2 6 is the same as that of anchor tube 1 5; the sealing of anchor tube 3 7 requires bonding waterproof canvas bags 8 into the large trumpet tube 31 and inserting a rubber plug 9 into the end of the connecting tube 33 for sealing.

[0069] Installation of the conduit 20: The impermeable canvas bag 8 is a closed bag that can be filled with gas or water, which expands to seal the anchor cylinder 3. For this purpose, the conduit 20 is vertically installed inside the steel cage of the anchor pile 1. The conduit 20 passes downward through the large trumpet pipe 31 and connects multiple impermeable canvas bags 8. The conduit 20 is attached to a main reinforcement bar of the steel cage of the anchor pile 1 and extends upward out of the steel cage.

[0070] Multiple impermeable canvas bags 8 inside the reinforcing cage of the anchor pile 1 can be filled with water through the conduit 20. After filling with water, the impermeable canvas bags 8 can fill the space of the large trumpet tube 31 and the small trumpet tube 32. The impermeable canvas bags 8 bulge outward in an arc shape, which effectively prevents the concrete of the anchor pile 1 from entering the anchor tube 3. At the same time, the arc-shaped bulge position is squeezed tightly against the inner wall of the pile hole, which can also prevent the anchor pile 1 from floating up and down. That is, when the reinforcing cage is lowered into the pile hole and concrete is poured, pressurized water is injected into the impermeable canvas bags 8 through the conduit 20 in a timely manner, so that the impermeable canvas bags 8 fill the large trumpet tube 31 and the small trumpet tube 32 and are in close contact with the pile hole wall, which can prevent the reinforcing cage from floating up.

[0071] The fabrication process of anchor pile 1 is as follows: First, the reinforcing cage is tied according to the design requirements. Then, anchor tubes 3 are welded at different elevations of the tied reinforcing cage. The position and number of anchor tubes 3 are calculated and determined according to the project requirements. The length of the large trumpet tube 31 is one-third of the diameter of the reinforcing cage. For anchor tubes 7 without small trumpet tubes 32, the length of the large trumpet tube 31 can be slightly longer, but not exceeding half the diameter of the reinforcing cage. The length of the small trumpet tube 32 is half to one time the length of the large trumpet tube 31. The outward expansion angle of the large trumpet tube 31 and the small trumpet tube 32 is 30~70°. The outer edges of both the large trumpet tube 31 and the small trumpet tube 32 reach the outer edge of the reinforcing cage. Neither the large trumpet tube 31 nor the small trumpet tube 32 cuts the main reinforcement of the reinforcing cage. When they conflict, the main reinforcement of the reinforcing cage must be bent to avoid them. The connecting pipe 33 is the section of the anchor tube 3 that runs horizontally through the pile body. The connecting pipe 33 is made of steel pipe with an inner diameter of 200~300mm.

[0072] The structure of the wing-shaped anchor bolt 4 is as follows: The wing-shaped anchor bolt 4 is an optimized and improved anchor bolt structure based on the conventional anchor bolt. The wing-shaped anchor bolt 4 includes a tie rod 41, an anchor head 42, and an anchor wing 43. The wing-shaped anchor bolt 4 needs to be inserted into the anchor tube 3 and grouted and anchored together with the anchor tube 3.

[0073] The tie rod 41 and the anchor head 42 both adopt conventional anchor rod structures. The tie rod 41 can be a steel bar, steel strand or steel wire rope, etc. The head of the tie rod 41 is equipped with an anchor head 42, which consists of an anchor and a bearing plate. The components of conventional anchor rods are very common in geotechnical engineering and will not be described in detail here.

[0074] To increase the strength of the connection between the wing-shaped anchor bolt 4 and the anchor pile 1, an anchor wing 43 is added to the bottom end of the tie rod 41 of the wing-shaped anchor bolt 4, that is, an anchor wing 43 is set at the tail of the tie rod 41. The anchor wing 43 includes a double-rib anchor wing 43 and a single-rib anchor wing 43. Both the double-rib anchor wing 43 and the single-rib anchor wing 43 include a base 10, a wing rod 11, and a tensioning ring 12, as shown. Figures 5-7 As shown.

[0075] The double-ribbed anchor wing 43 and the single-ribbed anchor wing 43 have the same features: the chassis 10 is welded and fixed to the tail end of the tie rod 41, and the tensioning ring 12 is slidably mounted on the tie rod 41, that is, the tensioning ring 12 is fitted into the tie rod 41 and can move freely along the tie rod 41. There are 4-8 wing rods 11 circumferentially between the tensioning ring 12 and the chassis 10, preferably four wing rods 11.

[0076] The double-ribbed anchor wing 43 and the single-ribbed anchor wing 43 also differ in that the installation method of the wing rod 11 is different. Specifically: In the double-ribbed anchor wing 43, the wing rod 11 is installed hinged between the chassis 10 and the tension ring 12. This wing rod 11 consists of two hinged joints, meaning that the wing rod 11 includes two hinged single ribs. In the single-ribbed anchor wing 43, the wing rod 11 is installed hinged to the chassis 10. The tension ring 12 has a slot, and one end of the wing rod 11 is engaged in the slot of the tension ring 12. This wing rod 11 is a single unit.

[0077] In summary, the difference between the single-rib anchor wing 43 and the double-rib anchor wing 43 is that the former has only one rib on its single wing rod 11, and the tension ring 12 has a groove to hold the outer end of the rib in place without affecting the pushing of the tension ring 12. The latter, the double-rib anchor wing 43, consists of two single ribs that are hinged to each other, and are respectively hinged to the chassis 10 and the tension ring 12.

[0078] In the initial state, the anchor wing 43 is in a closed state, which makes it easy for it to pass through the anchor tube 3. In order to open the anchor wing 43 and connect it with the anchor tube 3, an additional sleeve push rod is required. The sleeve push rod is sleeved on the tie rod 41, and the expansion of the wing rod 11 is achieved by pushing the tension ring 12 to move through the sleeve push rod.

[0079] It should be noted that, regardless of whether it is a double-ribbed anchor wing 43 or a single-ribbed anchor wing 43, the length of the wing rod 11 is calculated based on the premise that its maximum open envelope is 10-20 cm larger than the diameter of the connecting tube 33 in the anchor tube 3. This requires that the anchor wing 43 can pass through the connecting tube 33 when retracted, and that the diameter of the anchor wing 43 is larger than the connecting tube 33 when deployed. At the same time, the maximum hinge angle, or flip angle, of the wing rod 11 is limited to 80° so that multiple wing rods 11 can form an umbrella shape when deployed, avoiding the wing rods 11 remaining perpendicular to the tie rod 41.

[0080] Step 2: Construct anchor pile 1:

[0081] Step 21: Determine the hole position of the single anchor pile 1 and drill to the design elevation to form the pile hole;

[0082] Step 22: Lower the completed anchor pile 1 steel cage into the pile hole. When lowering the anchor pile 1 steel cage, adjust the opening direction of the anchor tube 3 and adjust the elevation of the steel cage at the same time.

[0083] Then, concrete is poured. When pouring concrete, it is necessary to strictly control the opening direction of the anchor tube 3 and the elevation of the steel cage to ensure the smooth construction of the wing-shaped anchor rod 4. When the concrete is about to cover the anchor tube 3, water is injected into the impermeable canvas bag 8 through the guide pipe 20, so that the impermeable canvas bag 8 inside the anchor tube 3 bulges outward, contacts and squeezes the pile hole wall. Concrete is poured up to 0.5m above the top of the anchor pile 1. After solidification, the single anchor pile 1 is formed.

[0084] Step 23: Repeat steps 21-22 to complete the construction of all anchor piles 1. The anchor piles 1 are arranged in rows after construction.

[0085] Step 3, Construction of Wing-Shaped Anchors 4: When the anchor piles 1 reach the required strength or construction time, excavation should begin. If the excavation surface is unstable, a surface layer should be constructed on the free face of the soil and rock mass. The surface layer can be selected as the inter-pile soil surface layer 18 or the shotcrete surface layer 14, depending on the requirements. When the excavation reaches 0.5m below the elevation of the corresponding anchor tube 3 in the anchor piles 1, the construction of the first layer of wing-shaped anchors 4 can begin.

[0086] Step 31: Hole position of fixed wing-shaped anchor bolt 4;

[0087] Step 32, Drilling anchor bolt holes: Use a full-length spiral drill bit with a diameter not greater than 100mm to form holes, or use a horizontal directional drilling rig to form holes, drill horizontally to the design depth to form anchor bolt holes. The design depth should ensure that the anchor wings 43 of the wing-shaped anchor bolt 4 can pass smoothly through the anchor tube 3 in the anchor pile 1 when they are retracted.

[0088] When the drilling tool is drilling, the large trumpet tube 31 of the anchor tube 3 plays a guiding role. When the drill bit deviates from the center of the corresponding large trumpet tube 31 of the anchor pile 1, the drill bit tends to move towards the center of the large trumpet tube 31 as the large trumpet tube 31 contracts forward. The long spiral drill rod straightens the drill rod by continuously rotating and cutting the soil around the hole, and finally ensures that a straight initial anchor hole is drilled.

[0089] Step 33, Hole cleaning after enlargement: Use hydraulic, wind, or other methods to enlarge part or all sections of the initial anchor bolt hole. The enlargement size needs to be determined according to the design. Then use hydraulic, wind, or other methods to remove loose soil and debris from the hole.

[0090] Step 34, Placement of Winged Anchor 4: When the anchor hole is irregular, first insert the PVC pipe into the anchor hole and extend it to the anchor tube 3. Place the winged anchor 4 with the anchor wing 43 at the bottom of the hole through the PVC pipe. When the winged anchor 4 is placed in the PVC pipe, manually operate to gradually open the anchor wing 43 and make it stuck in the anchor tube 3. The specific operation is as follows: Put the sleeve push rod of the round tube structure onto the pull rod 41 of the winged anchor 4, push the tension ring 12 of the anchor wing 43 to gradually open it, continue to push the tension ring 12, and combine it with pulling the winged anchor 4 outward to make the anchor wing 43 reach the best opening state. At this time, the anchor wing 43 is stuck in the anchor tube 3.

[0091] Step 35, Secondary high-pressure grouting after grouting: First, inject cement grout or other grout into the anchor bolt hole. About 2 to 3 hours after the first grouting, perform secondary high-pressure grouting to complete the construction of the single wing-shaped anchor bolt 4.

[0092] Step 36: Repeat steps 31-35 to complete the construction of the other wing-shaped anchor bolts 4 on the first floor; if the surface layer has not been constructed in the early stage, the surface layer construction shall be carried out after the construction of the wing-shaped anchor bolts 4 on the first floor. Here, the surface layer is selected as shotcrete surface layer 14.

[0093] Step 37, Construction of Waist Beam 15: When the strength of the grouting consolidation body in the multiple wing-shaped anchor rods 4 of the first layer reaches the design requirements, the waist beam 15 is constructed on the surface layer. The waist beam 15 is connected to the head end of the multiple wing-shaped anchor rods 4 of the first layer that has been constructed, i.e., the anchor head 42, and the wing-shaped anchor rods 4 are tensioned and locked. At this point, the construction of the wing-shaped anchor rods 4 of the first layer anchorage position is completed.

[0094] Step 4, Construction of the next layer of wing-shaped anchor bolts 4: Repeat step 3 to complete the construction of multiple wing-shaped anchor bolts 4 in the next layer.

[0095] Step 5: Repeat step 4 until the construction of the wing-shaped anchor bolts 4 in all remaining layers is completed. The final anchor pile type anchor bolt support structure construction is then complete. Figure 1 As shown.

[0096] After the construction of the anchor pile type anchor bolt support structure is completed, such as Figure 1As shown, its support principle is as follows: When the soil and rock mass displaces towards the free side, the shotcrete surface layer 14 is stressed and transmits the force to the wing-shaped anchor rod 4, causing the wing-shaped anchor rod 4 to tend to move towards the free side. The soil and rock mass surrounding the wing-shaped anchor rod 4, through its shear strength, prevents the deformation and movement of the wing-shaped anchor rod 4. When the stress on the wing-shaped anchor rod 4 increases, and the soil and rock mass around the wing-shaped anchor rod 4 can no longer prevent the deformation and movement of the wing-shaped anchor rod 4, the stress on the wing-shaped anchor rod 4 is transmitted to the anchor pile 1. After the anchor pile 1 is stressed, the soil and rock mass around the pile near the anchor end prevents it from undergoing horizontal displacement. When the stress on the wing-shaped anchor rod 4 further increases, the soil and rock mass around the pile in a larger range above and below the anchor end, especially the soil and rock mass around the pile below, jointly prevents it from undergoing horizontal displacement. Since the strength of the soil and rock mass tends to increase with depth, and the stress level of the deep environment is high, the soil and rock mass below or deep to the anchor position has a stronger potential resistance.

[0097] It should be noted that the surface layer construction is usually carried out after the grouting of the wing-shaped anchor bolts 4 is completed. Only when the excavation face is unstable will the surface layer, which is a shotcrete surface layer, be constructed as soon as the excavation face is formed. If the shotcrete surface layer (i.e., reinforced concrete shotcrete) is constructed first, anchor bolt hole positions should be left to prepare for the subsequent installation of the wing-shaped anchor bolts 4, avoiding the need to break the concrete when drilling holes later. When constructing the shotcrete surface layer 14 after the grouting of the wing-shaped anchor bolts 4, the anchor bolt entry point should be wrapped with easily removable materials to prevent the concrete from hardening and to facilitate the later tensioning and locking of the wing-shaped anchor bolts 4.

[0098] Example 2:

[0099] Based on Embodiment 1, this embodiment describes the pile-anchor type anchor support structure and its construction method: For example... Figures 8-10 As shown, a construction method for a pile-anchor type anchor support structure is provided. This support structure is a slope and foundation pit support structure composed of a support pile row 16 and anchor pile type anchors. The construction structure of the pile-anchor type anchor support structure includes: anchor pile type anchors, support pile row 16, capping beam 17, and soil surface layer 18 between piles, as follows: Figure 8 and Figure 9 As shown.

[0100] Support piles 16 are installed near the free face of the rock and soil mass. The support piles 16 consist of multiple support piles arranged in rows. The support piles referred to here are cast-in-place concrete piles. A capping beam 17 is constructed between the tops of the support piles 16. A soil surface layer 18 is constructed between two adjacent support piles. The soil surface layer 18 is a layered structure formed by cement-soil wire mesh, that is, a mixture of cement and soil is applied to the wire mesh to form the soil surface layer 18 between the piles.

[0101] Multiple anchor piles 1 are installed in the rock and soil mass away from the free face. Each anchor pile 1 has a wing-shaped anchor rod 4 inserted inside. The head of each wing-shaped anchor rod 4 passes through the soil surface layer 18 between the piles and extends out of the free face of the rock and soil mass. A waist beam 15 is also installed between the support piles 16. The anchor head 42 of each wing-shaped anchor rod 4 is connected and fixed to the waist beam 15. That is, the wing-shaped anchor rods 4 installed between the support piles 16 are tightly connected to the support piles 16 through the waist beam 15 and are anchored to the anchor piles 1 through the anchor tube 3 and grout.

[0102] The main difference between pile-anchor type anchor support structures and existing pile-anchor support structures used in geotechnical engineering is that the anchors used are anchor pile type anchors. Pile-anchor type anchor support structures are suitable for narrow sites or adverse geological conditions outside the foundation pit where conventional anchors cannot be used.

[0103] Based on the construction method of the anchor pile type anchor support structure, the construction method of the pile-anchor pile type anchor support structure also includes the construction of the support pile row 16 set between step 2 and step 3. The general construction steps of the support pile row 16 are as follows: First, determine the hole position of a single support pile and drill the hole to the design elevation to form a pile hole; then, put the steel cage of the support pile into the pile hole and pour concrete to form a pile; finally, repeat the above to complete the construction of all, a total of multiple support piles, to form the support pile row 16.

[0104] The construction steps of the entire pile-anchor pile support structure include three sub-items: the construction of the support piles 16, the anchor piles 1, and the wing-shaped anchors 4. The construction process and technology are basically the same as those for general reinforced concrete cast-in-place piles and anchors. The identical processes in each step will not be repeated here; only the different process requirements will be detailed, such as... Figure 10 As shown, the specific construction method includes the following steps:

[0105] Step 1, Preparation: Same as Step 1 in the construction steps of anchor pile type anchor rod, except that the processing and fabrication of the support pile reinforcement cage also needs to be completed.

[0106] Step 2: Construction of anchor pile 1: Same as step 2 in the construction steps of anchor pile type anchor rod.

[0107] Step 3, Construction of support piles:

[0108] Step 31: Determine the location of the single support pile hole and drill to the design elevation to form the pile hole;

[0109] Step 32: First, lower the steel cage of the support pile into the pile hole and pour concrete to form the pile;

[0110] Step 33: Repeat steps 31-32 to complete the construction of all the support piles, forming a support pile row 16.

[0111] Step 4, Construction of Wing-Shaped Anchors 4: After the anchor piles 1 and support piles 16 reach the required strength, excavation begins. A soil surface layer 18 is constructed between the piles on the free face of the rock and soil mass. The wire mesh is fixed to the piles using nails. The soil surface layer 18 is arc-shaped. When the excavation reaches 0.5m below the elevation of the first anchor tube 3 of the anchor pile 1, the first layer of wing-shaped anchors 4 is constructed, following these steps:

[0112] Step 41, Hole location of fixed wing-shaped anchor bolt 4: The hole location is located in the soil between two adjacent support piles, and is basically in a straight line with the anchor cylinder 3 of the corresponding anchor pile 1, so as to ensure smooth hole formation of anchor bolt.

[0113] Step 42, Drilling anchor bolt holes: Same as step 32 in the construction steps of anchor pile type anchor bolts;

[0114] Step 43, Hole cleaning after enlarging: Same as step 33 in the construction steps of anchor pile type anchor rod;

[0115] Step 44, Place wing-shaped anchor bolt 4: Same as step 34 in the construction steps of anchor pile type anchor bolt;

[0116] Step 45, Secondary high-pressure grouting after grouting: Same as step 35 in the construction steps of anchor pile type anchor rod;

[0117] Step 46: Repeat steps 41-45 to complete the construction of the other wing-shaped anchor bolts 4 on the first floor;

[0118] Step 47, Construction of Waist Beam 15: Same as Step 37 in the construction steps of anchor pile type anchor rod.

[0119] Step 5, Construction of the next layer of wing-shaped anchor bolts 4: When the earthwork is excavated to 0.5m below the elevation of the next layer of anchor cylinder 3 of the anchor pile 1, the wing-shaped anchor bolts 4 of the anchor position of this layer are constructed. The specific steps are repeated in step 4, and the construction of multiple wing-shaped anchor bolts 4 of the next layer can be completed.

[0120] Step 6: Repeat step 5 until all wing-shaped anchor bolts 4 in this layer are installed. Finally, the pile-anchor type anchor bolt support structure is completed. Figure 10 As shown.

[0121] Example 3:

[0122] Based on Embodiment 1, this embodiment describes the multi-beam double-row pile support structure and its construction method: as follows Figures 11-13As shown, a construction method for a multi-beam double-row pile support structure is described. This support structure is a new double-row pile support structure formed by multiple wing-shaped anchor rods 4 firmly connecting the front row of piles 22 and the rear row of piles 23 at different elevations. The rear row of piles 23 mentioned here are the anchor piles 1. The construction structure of the multi-beam double-row pile support structure is as follows: front row of piles 22, capping beam 17, rear row of piles 23, crossbeams 24, and soil surface layer 18 between piles, as shown. Figure 11 and Figure 12 As shown.

[0123] The front row of piles 22 is constructed within the rock and soil mass near the free face. The front row of piles 22 consists of multiple reinforced concrete piles arranged in a row. Specifically, the front row of piles 22 are conventional reinforced concrete piles with reserved anchor bolt spaces. These reserved anchor bolt spaces are achieved by pre-embedding hollow steel pipes. These hollow steel pipes are used for inserting wing-shaped anchor bolts 4. The inner diameter of the steel pipe is larger than the diameter of the anchor bolt drill bit, and its length is slightly smaller than the diameter of the front row of piles 22. Both ends of the steel pipe are sealed using rubber plugs 9 to prevent mixing or seepage into the concrete during pouring. A capping beam 17 is constructed between the tops of the front row of piles 22. An inter-pile soil surface layer 18 is constructed between the front row of piles 22 by applying a mixture of cement and soil onto a wire mesh to form the inter-pile soil surface layer 18.

[0124] The rear row of piles 23 is constructed in the rock and soil mass far from the free face. The distance between the rear row of piles 23 and the front row of piles 22 is less than 5m. The rear row of piles 23 consists of multiple anchor piles 1 arranged in a row. In short, the rear row of piles 23 uses anchor piles 1. The distance between two adjacent anchor piles 1 is an integer multiple of the distance between the front row of piles 22. Furthermore, the anchor pile 1 corresponds to a certain pile of the front row of piles 22 so as to form a multi-beam 24 structure.

[0125] Each anchor pile 1 is equipped with a wing-shaped anchor rod 4. The head of each wing-shaped anchor rod 4 passes through the back of the preceding pile 22 and extends out of the free surface of the rock and soil. The wing-shaped anchor rod 4 requires drilling during construction. After grouting is completed and the grout has solidified, it becomes an underground connecting beam, namely the crossbeam 24. The cross-sectional dimensions of the crossbeam 24 are determined by design, and the crossbeam 24 is achieved by expanding the hole during the anchor bolt hole drilling process.

[0126] A waist beam 15 is also installed on the front row of piles 22. The anchor head 42 of each wing-shaped anchor rod 4 is connected and fixed to the waist beam 15. That is, the waist beam 15 can connect the wing-shaped anchor rod 4 to the front row of piles 22 and the rear row of piles 23 into a whole. Multiple wing-shaped anchor rods 4 are used as crossbeams 24, and then the wing-shaped anchor rods 4 and the front and rear rows of piles 23 are rigidly connected into a whole to form a frame structure.

[0127] The difference between the multi-beam double-row pile support structure and the conventional double-row pile structure lies in the following: The conventional double-row pile support structure consists of two rows of piles, one in front and one in back, with a spacing of less than 2 meters between them. The piles are connected only at their tops, meaning a connecting beam is placed at the top of each row, forming a gate-like structure in cross-section. Double-row pile support structures are a relatively good type of support structure for foundation pits under difficult or complex geological conditions, offering significant advantages in foundation pit and slope support. However, the gate-like structure with only the tops of the piles connected is far less stable than the combined structure with multiple beams connecting the two rows. Furthermore, with only the tops connected, the rear piles 23, far from the open surface of the foundation pit or slope, are only subjected to horizontal tension at their tops. When the pile top is subjected to horizontal force, only the pile body at a certain depth and the surrounding soil and rock mass play a major role.

[0128] The combined structure of the front and rear rows of piles connected by multiple crossbeams is what is referred to here as the multi-crossbeam double-row pile support structure. This support structure, based on the conventional double-row piles, adds one or more crossbeams 24 to the cross section for connection. These crossbeams 24 are underground connecting beams formed by grouting the wing-shaped anchor rods 4 into the completed holes and allowing the grout to solidify. Multiple crossbeams 24 securely connect the pile bodies of the front and rear rows of piles 23. Therefore, the multi-crossbeam double-row pile support structure not only improves its own stability but also fully utilizes the resistance of deep soil and rock masses, significantly enhancing the stability of foundation pits, slopes, and strata, resulting in a better support effect than conventional double-row piles.

[0129] The difference between the multi-beam double-row pile support structure and the pile-anchor pile type anchor support structure is that the latter's wing-shaped anchor rods 4 are only fixedly connected to the rear row of anchor piles 1, while they are tightly connected to the front row of support piles through the waist beam 15; while the former's front and rear rows of piles are firmly connected by wing-shaped anchor rods 4 passing through their pile bodies.

[0130] Based on the construction method of anchor pile type anchor support structure, the construction method of multi-beam double-row pile support structure also includes the construction of the front row piles 22 set between steps 2 and 3. The general construction steps of the front row piles 22 are as follows: First, a steel cage with pre-embedded hollow steel pipes is made for the front row piles 22. The arrangement and quantity of the hollow steel pipes are consistent with the anchor tubes 3 in the anchor piles 1. Second, the hole position of each front row pile 22 is determined and the hole is drilled to the design elevation to form a pile hole. Then, the steel cage with hollow steel pipes of the front row piles 22 is lowered into the pile hole and concrete is poured to form a pile. When lowering the steel cage and pouring concrete, the opening direction of the steel pipes and the elevation of the steel cage must be strictly controlled. Finally, the above is repeated to complete the construction of all, totaling multiple front row piles 22.

[0131] The construction steps of the entire multi-beam double-row pile support structure include three sub-items: the construction of the front row of piles 22, the rear row of piles 23, and the wing-shaped anchor bolts 4. The construction process and technology are basically the same as those for general reinforced concrete cast-in-place piles and anchor bolts. The identical processes in each step will not be repeated here; only the different process requirements will be detailed, such as... Figure 13 As shown, the specific construction method includes the following steps:

[0132] Step 1, Preparation: Similar to Step 1 in the construction steps of anchor pile type anchor rod, in addition, it is necessary to complete the processing and fabrication of the front row pile 22 steel cage with pre-embedded hollow steel pipe. The two ends of the steel pipe are sealed with rubber plugs 9. This form is similar to the form of the anchor pile 1 steel cage.

[0133] Step 2, construction of the rear piles 23, i.e., anchor pile 1: same as step 2 in the construction steps of anchor pile type anchor rod.

[0134] Step 3, Construction of the front row of piles 22:

[0135] Step 31: Determine the hole position of the single front row pile 22 and drill the hole to the design elevation to form the pile hole;

[0136] Step 32: Lower the front row of pile 22 steel cage with hollow steel pipe into the pile hole. During the lowering process, adjust the opening direction of the steel pipe and the elevation of the steel cage.

[0137] Step 33: Pour concrete. During the pouring process, it is necessary to strictly control the direction of the steel pipe opening and the elevation of the steel cage to ensure the smooth construction of the wing-shaped anchor bolts 4.

[0138] Step 34: Repeat steps 31-33 to complete the construction of all, totaling multiple front row piles 22.

[0139] Step 4, Construction of Wing-Shaped Anchors 4: When the rear piles 23 and the front piles 22 reach the required strength, the foundation pit is excavated, and the soil surface layer 18 between the piles is constructed on the free face of the rock and soil mass; when the foundation pit is excavated to 0.5m below the elevation of the first anchor tube 3 of the anchor pile 1, the construction of the first layer of wing-shaped anchors 4 can be carried out:

[0140] Step 41, Hole position of fixed wing-shaped anchor 4: Locate the position of the pre-embedded hollow steel pipe reserved on the front row pile 22 and open it;

[0141] Step 42, Drilling anchor bolt holes: Same as step 32 in the construction steps of anchor pile type anchor bolts, except that the holes are drilled horizontally from the hollow steel pipe reserved on the front row of piles 22 to the design depth.

[0142] Step 43, Hole cleaning after enlargement: Similar to step 33 in the construction steps of anchor pile type anchor rod, the anchor rod hole constituting the cross beam 2424 should be larger than the simple anchor pile type anchor rod hole. The specific size is determined by the design.

[0143] Step 44, Place wing-shaped anchor bolt 4: Same as step 34 in the construction steps of anchor pile type anchor bolt;

[0144] Step 45, Secondary high-pressure grouting after grouting: Same as step 35 in the construction steps of anchor pile type anchor rod;

[0145] Step 46: Repeat steps 41-45 to complete the construction of the other wing-shaped anchor bolts 4 on the first floor;

[0146] Step 47, Construction of Waist Beam 15: Same as Step 37 in the construction steps of anchor pile type anchor rod.

[0147] Step 5, Construction of the next layer of wing-shaped anchor bolts 4: When the earthwork is excavated to 0.5m below the elevation of the next layer of anchor cylinder 3 of the anchor pile 1, the wing-shaped anchor bolts 4 of the anchor position of this layer are constructed. The specific steps are repeated in step 4, and the construction of multiple wing-shaped anchor bolts 4 of the next layer can be completed.

[0148] Step 6: Repeat step 5 until all wing-shaped anchor bolts 4 in this layer are installed. Finally, the construction of the multi-beam double-row pile support structure is completed, as shown below. Figure 13 As shown.

[0149] Example 4:

[0150] Based on Embodiment 1, this embodiment describes the soil nailing-anchor pile type anchor support structure and its construction method: as follows Figures 14-15 As shown, a construction method for a soil nail-anchor pile type anchor support structure is provided. This support structure is a slope support structure composed of soil nails 19 and anchor pile type anchors. The construction structure of the soil nail-anchor pile type anchor support structure consists of: shotcrete surface layer 14, soil nails 19, anchor piles 1, and wing-shaped anchors 4.

[0151] A shotcrete surface layer 14 is constructed on the free face of the soil and rock mass. The shotcrete surface layer 14 is a layered structure formed by shotcrete, steel mesh, and reinforcing bars. Multiple rows of soil nails 19 are constructed within the soil and rock mass. The multiple rows of soil nails 19 are arranged vertically, with multiple soil nails in each row. The outer ends of the soil nails 19 are connected and fixed to the reinforcing bars in the shotcrete surface layer 14. The other parts of the soil nails 19 enter the soil and rock mass, are encased by the soil and rock mass, and are in close contact with the soil and rock mass.

[0152] Multiple anchor piles 1 are constructed within the soil and rock mass, away from the free face. Each anchor pile 1 has a wing-shaped anchor rod 4 inserted inside. The head of each wing-shaped anchor rod 4 passes through the shotcrete surface layer 14 and extends out of the free face of the soil and rock mass. A waist beam 15 is also installed on the shotcrete surface layer 14. The anchor head 42 of each wing-shaped anchor rod 4 is connected and fixed to the waist beam 15. That is, the outer end of the wing-shaped anchor rod 4 is in close contact with the shotcrete surface layer through the anchor head 42 and the waist beam 15, while the other parts penetrate into the soil and are firmly connected to the anchor pile 1. Soil nails 19 are distributed on both the upper and lower sides of the wing-shaped anchor rod 4.

[0153] The soil nailing-anchor pile type anchor support structure is a new type of composite soil nailing 19 structure, which is an extension of the conventional composite soil nailing 19 structure. The conventional composite soil nailing 19 structure is a common method for reinforcing foundation pits and slopes, but it is not suitable for situations with site constraints or weak soil layers. The conventional composite soil nailing 19 structure consists of soil nails and conventional anchors. However, the conventional composite soil nailing 19 structure is somewhat inadequate due to the limited length of the anchors. Therefore, by replacing the conventional anchors in the conventional composite soil nailing 19 with anchor pile type anchors, the new composite soil nailing 19 structure is obtained. The new composite soil nail structure includes a soil nail layer and a soil nail-wing-shaped anchor hybrid layer.

[0154] Based on the construction method of anchor pile type anchor support structure, the construction method of soil nail-anchor pile type anchor support structure also includes the repeated construction of soil nails 19 in step 3, setting multiple rows of soil nail layers and multiple rows of soil nail-wing anchor mixed layers in the rock and soil body, and the soil nail construction includes soil nails 19 in the soil nail layer and soil nails 19 in the soil nail-wing anchor mixed layer.

[0155] Both soil nail layers and soil nail-wing anchor mixed layers require multiple layers. A soil nail layer is either entirely composed of soil nails 19 or composed of a mixture of soil nails 19 and wing anchors 4. In the soil nail-wing anchor mixed layer, the soil nails 19 and wing anchors 4 are constructed simultaneously but alternately or at staggered times. The wing anchors 4 in the same layer are distributed with large spacing, and there is one or more soil nails 19 between the wing anchors 4. Their regular distribution constitutes the soil nail-wing anchor mixed layer.

[0156] The construction steps for soil nail 19 are as follows: First, determine the hole position and drill to the designed depth; then, lower the soil nail 19 into the drilled hole, inject cement grout, and add grout or perform secondary grouting as required to complete the construction of a single soil nail 19; finally, repeat the above steps to complete the construction of all soil nails 19 in the same layer, totaling several rows.

[0157] The construction steps of the entire soil nail-anchor pile type anchor support structure include the construction of three sub-items: soil nail 19, anchor pile 1, and wing-shaped anchor 4. The construction process and technology are basically the same as those for general soil nail 19, reinforced concrete cast-in-place piles, and anchors. The identical processes in each step will not be repeated here; only the different process requirements will be detailed. Figures 14-15 As shown, the specific construction method includes the following steps:

[0158] Step 1, Preparation: Same as Step 1 in the construction steps of anchor pile type anchor rod, except that soil nail 19 needs to be processed and manufactured.

[0159] Step 2, Construction of Anchor Pile 1: Same as Step 2 in the construction steps of anchor pile type anchor rod.

[0160] Step 3, Construction of the first layer of soil nails 19: When the anchor pile 1 reaches the required strength or construction time, the soil excavation begins. When the soil excavation reaches 0.5m below the location of the soil nail 19, the construction of the soil nail 19 begins. The construction process of the soil nail 19 is as follows:

[0161] Step 31: Determine the hole location and drill to the designed depth;

[0162] Step 32: Lower the soil nail 19 into the borehole, inject cement grout, and add grout or perform secondary grouting as required to complete the construction of a single soil nail 19;

[0163] Step 33: Repeat steps 31-32 to complete the construction of the first row of soil nails 19 in the same layer;

[0164] Step 34: Lay steel mesh and reinforcing bars along the excavated slope, connect the outer ends of all soil nails 19 in this layer to the reinforcing bars, and use welding or hooks to firmly hang the reinforcing bars and mesh. Shot concrete in two stages to the designed thickness to complete the construction of shotcrete surface layer 14.

[0165] Step 35: Repeat steps 33-34 to complete the construction of multiple rows of soil nail layers above the first layer of wing-shaped anchor rods 4 from top to bottom.

[0166] Step 4: Construction of the first-layer wing-shaped anchor bolts 4: When the excavation of the foundation pit or slope reaches 0.5m below the anchor position of the first-layer anchor pile type anchor bolt, the wing-shaped anchor bolts 4 are constructed. The specific steps are the same as steps 31-37 in the construction steps of the anchor pile type anchor bolt support structure, and also include the construction of the soil nails 19 in the same layer. It should be noted that step 4 is actually the construction of a soil nail-wing-shaped anchor bolt mixed layer. The construction of the wing-shaped anchor bolts 4 and the construction of the soil nails 19 in the same row should be carried out simultaneously but alternately or at staggered times. That is, the construction personnel can be divided into two groups, one group constructing the soil nails 19 and the other group constructing the wing-shaped anchor bolts 4, and the two groups work simultaneously. After the construction of the soil nails 19 and wing-shaped anchor bolts 4 in this layer is completed and the shotcrete surface layer 14 reaches the required strength, the waist beam 15 is constructed to tension and lock the wing-shaped anchor bolts 4.

[0167] Step 5: Construction of the next soil nail layer or soil nail-wing anchor hybrid layer: When the foundation pit or slope is excavated to 0.5m below the location of the next soil nail layer or soil nail-wing anchor hybrid layer, repeat steps 3-4 to construct the soil nail layer or soil nail-wing anchor hybrid layer.

[0168] Step 6: Repeat step 5 until all soil nails 19 and anchor piles on the slope are installed, thus completing the construction of the new composite soil nail support structure for this section. Figures 14-15 As shown.

[0169] After the construction of the soil nailing-anchor pile type anchor support structure is completed, such as Figure 15As shown, its support principle is as follows: After excavation, a foundation pit or slope with an open face is formed. The soil on the sidewall of the foundation pit or slope deforms towards the open face, exerting a force on the shotcrete surface layer 14. The shotcrete surface layer 14 transfers this force to the soil nails 19 and the wing-shaped anchors 4. The soil nails 19 and the wing-shaped anchors 4 provide restraint through the shear strength of the surrounding soil and rock, preventing the shotcrete surface layer 14 from moving towards the open face. When the soil nails 19 cannot effectively prevent it from moving towards the open face, the force on the shotcrete surface layer 14 is transferred more to the wing-shaped anchors 4. However, the anchor piles 1 can provide huge resistance to the wing-shaped anchors 4, restraining the shotcrete surface layer 14 from moving towards the open face, thereby ensuring the stability of the foundation pit sidewall or slope.

[0170] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention should be included within the scope of the present invention.

Claims

1. A construction method of an anchor pile type anchor rod support structure including a pile-anchor pile type anchor rod support structure, a multiple beam double row pile support structure, and a soil nail-anchor pile type anchor rod support structure, characterized by, The construction method comprises anchor pile (1) construction and wing-shaped anchor rod (4) construction, and specifically comprises the following steps: Step 1, preparation: in addition to the conventional construction preparation, the processing and manufacturing of the anchor pile (1) reinforcement cage with anchor penetrating barrels (3), guide pipes (20) and water-impermeable canvas bags (8) and the wing-shaped anchor rod (4) with umbrella-shaped openable anchor wings (43) structure need to be completed; The anchor pile (1) reinforcement cage is internally pre-provided with a plurality of anchor penetrating barrels (3) arranged in an up-down manner, the anchor penetrating barrel (3) is a hollow barrel-shaped structure with two open ends, and the anchor penetrating barrel (3) penetrates the reinforcement cage in a radial direction; each anchor penetrating barrel (3) is internally provided with a water-impermeable canvas bag (8) on both sides, the anchor pile (1) reinforcement cage is vertically provided with a guide pipe (20) inside, and the guide pipe (20) communicates a plurality of water-impermeable canvas bags (8); the wing-shaped anchor rod (4) comprises a pull rod (41), an anchor head (42) and an anchor wing (43), the pull rod (41) is provided with the anchor head (42) at the head and provided with the anchor wing (43) at the tail, and the anchor wing (43) is umbrella-shaped and opened to hold the anchor penetrating barrel (3); Step 2, construction of the anchor pile (1): Step 21, a hole position of a single anchor pile (1) is determined, and drilling is performed to a design elevation to form a pile hole; Step 22, the anchor pile (1) reinforcement cage after being processed is lowered into the pile hole, and then concrete is poured, and after solidification, a single anchor pile (1) is formed; Step 23, steps 21-22 are repeated to complete the construction of all, a total of a plurality of anchor piles (1), and the anchor piles (1) after construction are arranged in a row; Step 3, construction of the wing-shaped anchor rod (4): when the anchor pile (1) reaches the required strength or the construction time, earthwork is excavated, when the excavation surface is unstable, a surface layer is constructed on the rock-soil body free surface, and then the construction of the first layer of wing-shaped anchor rods (4) is performed, otherwise, after the construction of the first layer of wing-shaped anchor rods (4) is completed, the surface layer is constructed on the rock-soil body free surface: Step 31, a hole position of the wing-shaped anchor rod (4) is determined; Step 32, drilling of the anchor rod hole: drilling tools are used to form an initial anchor rod hole by horizontal drilling to a design depth; Step 33, hole cleaning after reaming: water power and air power are used to ream the initial anchor rod hole in part or all sections; then water power and air power are used to remove the soil and slag in the hole; Step 34, placement of the wing-shaped anchor rod (4): first, a PVC pipe is inserted into the anchor rod hole and extended to the position of the anchor penetrating barrel (3), the wing-shaped anchor rod (4) with the anchor wing (43) is placed at the bottom of the hole through the PVC pipe, manual operation is performed to gradually open the anchor wing (43) and make it clamped in the anchor penetrating barrel (3); Step 35, secondary high-pressure grouting after grouting: first, cement slurry is injected into the anchor rod hole, and 2-3 hours after the first grouting, secondary high-pressure grouting is performed to complete the construction of a single wing-shaped anchor rod (4); Step 36, steps 31-35 are repeated to complete the construction of other wing-shaped anchor rods (4) in the first layer; when the surface layer is not constructed in the early stage, the surface layer is constructed after the construction of the wing-shaped anchor rods (4) in the first layer. Step 37, construction of the waist beam (15): when the grouting consolidation strength of the plurality of wing-shaped anchor rods (4) in the first layer reaches the design requirement, the construction of the waist beam (15) is performed on the surface layer, the waist beam (15) is connected with the head end of the plurality of wing-shaped anchor rods (4) in the first layer which has been constructed, and the wing-shaped anchor rods (4) are tensioned and locked, and thus the construction of the wing-shaped anchor rods (4) in the first anchorage position is completed; Step 4, construction of the wing-shaped anchor rods (4) in the next layer: step 3 is repeated to complete the construction of the plurality of wing-shaped anchor rods (4) in the next layer; Step 5, step 4 is repeated until the construction of the wing-shaped anchor rods (4) in all the remaining layers is completed, and finally the construction of the anchor pile type anchor rod support structure is completed.

2. A method of construction of an anchoring pile type rock bolt support structure according to claim 1, characterized in that, In step 22, when the reinforcement cage of the anchor pile (1) is lowered, the opening direction of the anchor penetrating cylinder (3) is adjusted, and the elevation of the reinforcement cage is adjusted; when the concrete is poured, the opening direction of the anchor penetrating cylinder (3) and the elevation of the reinforcement cage need to be strictly controlled to ensure the smooth construction of the subsequent wing-shaped anchor rods (4), and when the concrete is about to cover the anchor penetrating cylinder (3), the water in the water-impermeable canvas bag (8) is filled through the conduit (20) to make the water-impermeable canvas bag (8) in the anchor penetrating cylinder (3) protrude outward, contact and press the pile hole wall; the concrete is poured to 0.5 m above the top of the anchor pile (1).

3. A method of construction of an anchoring pile type rock bolt support structure according to claim 1, characterized in that, In step 3, when the earthwork excavation is 0.5 m below the corresponding anchor penetrating cylinder (3) elevation in the anchor pile (1), the construction of the first layer of wing-shaped anchor rods (4) can be performed; before the construction of the waist beam (15) after the grouting of the first layer of wing-shaped anchor rods (4), the surface layer construction is carried out, and the surface layer includes the soil surface layer (18) or the sprayed concrete surface layer (14); only when the earthwork excavation surface is unstable, the anchor position is excavated first, then the surface layer is constructed and the anchor rod hole position is reserved, the wing-shaped anchor rod (4) is constructed after the surface layer reaches the required strength, and the waist beam (15) is constructed after the grouting and solidification of the wing-shaped anchor rod (4) reaches the required strength, and the anchor rod is tensioned and locked; In step 32, the drilling tool is a full-length spiral drilling tool with a diameter of not greater than 100 mm, or a horizontal directional drilling tool; the design depth of the anchor rod hole ensures that the wing-shaped anchor rod (4) can smoothly pass through the anchor penetrating cylinder (3) in the anchor pile (1) when it is retracted; In step 34, when the wing-shaped anchor rod (4) is placed in the PVC pipe, the sleeve push rod of the circular tube structure is sleeved on the wing-shaped anchor rod (4), the anchor wing (43) is pushed to gradually open, and the anchor wing (43) is combined with the outwardly pulled wing-shaped anchor rod (4) to make the anchor wing (43) reach the open state, and at this time the anchor wing (43) is clamped in the anchor penetrating cylinder (3).

4. A method of construction of a pile-anchored pile-type rock bolt support structure, characterised by, The construction method of the anchor pile type anchor rod support structure according to any one of claims 1 to 3, the construction method further comprising the construction of the support row pile (16) arranged between steps 2 and 3, the support row pile (16) being composed of a plurality of support piles arranged in a row; The construction steps of the support row piles (16) are as follows: firstly, the hole position of a single support pile is determined, and a pile hole is drilled to the design elevation to form a pile hole; then a reinforcement cage of the support pile is lowered into the pile hole, and the support pile is formed by pouring concrete; finally, the above construction steps are repeated to complete the construction of all the multiple support piles, thereby forming the support row piles (16); the crown beams (17) are constructed between the pile tops of the support row piles (16); The surface layer constructed on the free surface of the rock-soil body in step 3 comprises an inter-pile soil surface layer (18), and the wing-shaped anchor rods (4) are connected with the waist beams (15) by penetrating through the inter-pile soil surface layer (18); the hole position of the wing-shaped anchor rod (4) in step 31 is located in the rock-soil body between two adjacent support piles and is in a straight line with the anchor penetrating cylinder (3) of the corresponding anchor pile (1).

5. A construction method of a multi-beam double-row pile support structure, characterized by, The construction method of the anchor pile type anchor rod support structure according to any one of claims 1 to 3 further comprises the construction of the front row piles (22) arranged between steps 2 and 3, wherein the front row piles (22) are composed of multiple reinforced concrete piles arranged in a row; The construction steps of the front row piles (22) are as follows: firstly, a reinforcement cage of the front row pile (22) with a pre-buried hollow steel pipe is made, and the arrangement form and number of the hollow steel pipe are consistent with those of the anchor penetrating cylinder (3) in the anchor pile (1); secondly, the hole position of a single front row pile (22) is determined, and a pile hole is drilled to the design elevation to form a pile hole; then a reinforcement cage of the front row pile (22) with the hollow steel pipe is lowered into the pile hole, and the front row pile (22) is formed by pouring concrete; when the reinforcement cage is lowered and the concrete is poured, the opening direction of the steel pipe and the elevation of the reinforcement cage need to be strictly controlled; finally, the above construction steps are repeated to complete the construction of all the multiple front row piles (22); the crown beams (17) are constructed between the pile tops of the front row piles (22); The surface layer constructed on the free surface of the rock-soil body in step 3 comprises an inter-pile soil surface layer (18), and the wing-shaped anchor rods (4) are connected with the waist beams (15) by penetrating through the inter-pile soil surface layer (18); the hole position of the wing-shaped anchor rod (4) in step 31 is located in the rock-soil body between two adjacent support piles and is in a straight line with the anchor penetrating cylinder (3) of the corresponding anchor pile (1).

6. A method of construction of a soil nail-anchor-pile type anchor rod support structure, characterized by, The construction method of the anchor pile type anchor rod support structure according to any one of claims 1 to 3 further comprises the construction of the front row piles (22) arranged between steps 2 and 3, wherein the front row piles (22) are composed of multiple reinforced concrete piles arranged in a row; The construction steps of the front row piles (22) are as follows: firstly, a reinforcement cage of the front row pile (22) with a pre-buried hollow steel pipe is made, and the arrangement form and number of the hollow steel pipe are consistent with those of the anchor penetrating cylinder (3) in the anchor pile (1); secondly, the hole position of a single front row pile (22) is determined, and a pile hole is drilled to the design elevation to form a pile hole; then a reinforcement cage of the front row pile (22) with the hollow steel pipe is lowered into the pile hole, and the front row pile (22) is formed by pouring concrete; when the reinforcement cage is lowered and the concrete is poured, the opening direction of the steel pipe and the elevation of the reinforcement cage need to be strictly controlled; finally, the above construction steps are repeated to complete the construction of all the multiple front row piles (22); the crown beams (17) are constructed between the pile tops of the front row piles (22); The surface layer constructed on the free surface of the rock-soil body in step 3 comprises an inter-pile soil surface layer (18), and the wing-shaped anchor rods (4) are connected with the waist beams (15) by penetrating through the inter-pile soil surface layer (18); the hole position of the wing-shaped anchor rod (4) in step 31 is located in the rock-soil body between two adjacent support piles and is in a straight line with the anchor penetrating cylinder (3) of the corresponding anchor pile (1). The construction method of the anchor pile type anchor rod support structure according to any one of claims 1 to 3 further comprises the construction of the front row piles (22) arranged between steps 2 and 3, wherein the front row piles (22) are composed of multiple reinforced concrete piles arranged in a row; The surface layer constructed on the free surface of the rock-soil mass in Step 3 includes a shotcrete surface layer (14), the outer end of the soil nail (19) is connected with the shotcrete surface layer (14), and the wing-shaped anchor rod (4) is connected with the waist beam (15) through the shotcrete surface layer (14); the construction of the next layer of wing-shaped anchor rod (4) in Step 4 includes the construction of the soil nail (19) in the same layer, that is, the construction of the soil nail-wing-shaped anchor rod mixed layer; and the construction of the soil nail layer and the soil nail-wing-shaped anchor rod mixed layer is repeated in Step 5 until the construction of the soil nail (19) and the wing-shaped anchor rod (4) in all remaining layers is completed.

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