Larssen pile and steel pipe pile combined support, construction method and guide device

Abstract

The application provides a Larssen pile and steel pipe pile combined support, a construction method and a guide device. The Larssen pile and steel pipe pile combined support comprises a support assembly installed in a surrounding support, and the surrounding support comprises Larssen piles and steel pipe piles. At least one Larssen pile is connected between two steel pipe piles. The combined support further comprises a telescopic pile arranged between the Larssen pile and the steel pipe pile. The telescopic pile comprises an 'S'-shaped bending structure, a connecting plate, a stud and a nut. The two ends of the 'S'-shaped bending structure are respectively provided with first notches. The connecting plate is symmetrically arranged on the same side of the 'S'-shaped bending structure. The connecting plate is provided with a plurality of through holes distributed along the height direction. The stud passes through the through holes and is fixed on the connecting plate by the nuts at both ends. The size of the surrounding support is not limited by the selection of the pile body, and the reliable installation can be realized by a special guide mode, thereby improving the engineering quality.

Description

Technical Field

[0001] This invention belongs to the field of steel pipe pile construction technology, specifically relating to a Larssen pile and steel pipe pile combined support, construction method and guiding device. Background Technology

[0002] Chinese patent CN110067249A discloses a precast concrete (PC) pile retaining structure using Larssen piles of varying widths. Because the retaining structure contains two types of piles, the size of the excavation pit is closely related to the pile selection. Designers and construction personnel must ensure that the dimensions of each edge of the retaining structure precisely meet the design requirements of a specific number of piles. Thus, once the pile selection and quantity are determined, the retaining structure's dimensions are uniquely determined, thereby imposing certain limitations. Furthermore, since the retaining structure includes two types of piles installed alternately, it is difficult to guarantee their installation accuracy during construction, which can easily lead to misalignment and affect construction quality. Summary of the Invention

[0003] The purpose of this invention is to provide a combined support and construction method and guiding device for Larssen piles and steel pipe piles, which not only makes the retaining size not limited by the pile body selection, but also enables reliable installation through a special guiding method, thereby improving the quality of the project.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a Larssen pile and steel pipe pile combined support, including a retaining wall and a support assembly installed inside the retaining wall, wherein the retaining wall includes Larssen piles and steel pipe piles, at least one Larssen pile is connected between two steel pipe piles, and the support also includes an expansion pile, wherein the expansion pile is disposed between the Larssen piles and the steel pipe piles.

[0005] The telescopic pile includes an "S"-shaped bending structure, a connecting plate, a double-ended stud, and a nut; the two ends of the "S"-shaped bending structure are respectively provided with a first tongue and groove, the connecting plate is symmetrically arranged on the same side of the "S"-shaped bending structure, the connecting plate is provided with a plurality of through holes distributed along the height direction, the double-ended stud passes through the through holes and its two ends are respectively fixed to the connecting plate by the nut;

[0006] The maximum width of the expansion joint is equal to the width of the Larsen pile, and its minimum width is half the width of the Larsen pile.

[0007] Furthermore, the “S”-shaped bending structure has an odd number of bending structures.

[0008] Furthermore, the connecting plate is located on the side of the “S”-shaped bending structure with fewer bending structures.

[0009] The present invention also provides a construction method for forming the above-mentioned Larssen pile and steel pipe pile combined support, characterized by comprising the following steps:

[0010] Step 1: Determine the specifications, quantity, and distribution of Larssen piles, steel pipe piles, and expansion piles required for each edge of the retaining wall based on the design dimensions of the foundation pit; the distribution method is determined according to the following method:

[0011] At the apex of the edge line, install the corresponding type of steel pipe piles. In the middle of the edge line, install Larsen piles, another type of steel pipe piles and expansion piles. The angle between the two tongues and grooves on the steel pipe piles used for connecting the middle of the edge line and the line connecting the center of the circle is 180°. The angle between the two tongues and grooves on the steel pipe piles used for connecting the apex of the edge line and the line connecting the center of the circle is 90°.

[0012] If the connection gap ΔL between the last Larssen pile in the sideline and the steel pipe pile at the end point satisfies the first condition, then a telescopic pile is connected between the two. If ΔL satisfies the second condition, then the last Larssen pile is omitted and two telescopic piles are connected between the second-to-last Larssen pile and the steel pipe pile.

[0013] The first condition is: 0.5L < ΔL < L, and the second condition is: 0 < ΔL < 0.5L, where L is the effective connection width of a single Larssen pile.

[0014] Step 2: Select one of the edge lines as the starting point according to the design requirements of the foundation pit, and insert positioning rods at the remaining vertices. Using the guiding device, start from the starting point and insert Larssen piles, expansion piles and steel pipe piles into the ground in a preset distribution and construction direction to form the retaining structure.

[0015] Step 3: Excavate the portion within the enclosure and install inner support components layer by layer according to the excavation depth to form the combined support of Larssen piles and steel pipe piles.

[0016] Furthermore, in step two, the steel pipe piles are installed using a jet grouting process.

[0017] Furthermore, step two includes the following steps:

[0018] A guide device is set at the starting point corresponding to the current construction direction, and a traction device is installed on the extension line of the corresponding end point.

[0019] Under the guidance of the guiding device, the corresponding type of steel pipe pile is aligned with the starting position before construction and installation.

[0020] Under the guidance of the guiding device, Larssen piles and another type of steel pipe piles are installed in sequence until the installation of the last Larssen pile in the construction direction is completed. During this process, the guiding device is gradually pulled along the construction direction by the traction device.

[0021] Pull out the positioning rod, and align the corresponding type of steel pipe pile with the end position under the guidance of the guiding device before proceeding with construction and installation.

[0022] After adjusting the expansion pile to the appropriate width, insert it between the last Larsen pile and the steel pipe pile at the end point to complete the installation in this construction direction;

[0023] Adjust the orientation of the guide device to align it with the next construction direction, and at the same time adjust the position of the traction device to place it on the extension line of the next endpoint;

[0024] Repeat the above process until installation is complete in all construction directions.

[0025] The present invention also provides a guiding device, comprising:

[0026] A ground-mounted mobile frame, wherein casters are installed at the bottom of the ground-mounted mobile frame and tracks are installed on its left and right sides;

[0027] A guide frame, on both sides of which are mounted longitudinal rollers and horizontal rollers for rolling connection to the track;

[0028] A rotating frame, which is rotatably mounted on the left and right sides inside the guide frame;

[0029] A rotating frame adjuster is installed on the left and right sides of the guide frame to change the posture of the rotating frame;

[0030] A steel pipe pile positioning plate, which is slidably installed at one end of the inner side of the rotating frame;

[0031] A steel pipe pile positioning plate adjuster is installed at one end of the inner side of the rotating frame to change the spacing of the steel pipe pile positioning plates.

[0032] Larssen pile positioning plate, which is slidably installed at the other end of the inner side of the rotating frame;

[0033] Larssen pile positioning plate adjuster, which is installed at the other end of the inner side of the rotating frame to change the spacing of the Larssen pile positioning plates.

[0034] Furthermore, the rotating frame is an "H"-shaped structure frame, the steel pipe pile positioning plate is installed on the vertical part of one end of the "H"-shaped structure frame, and the Larsen pile positioning plate is installed on the vertical part of the other end of the "H"-shaped structure frame.

[0035] Furthermore, the steel pipe pile positioning plate adjuster and the Larsen pile positioning plate adjuster are screw and nut mechanisms.

[0036] Furthermore, the rotating frame adjuster includes:

[0037] A lead screw nut, which is mounted on the guide frame;

[0038] A lead screw, which is mounted on a lead screw nut;

[0039] A gear, which is mounted on a shaft on one side of the rotating frame;

[0040] A rack, which is slidably mounted on one side of the guide frame and meshes with a gear on that side, and is connected to the inner end of a lead screw on that side;

[0041] A rotating frame adjusting handwheel is installed at the outer end of the lead screw.

[0042] Compared with the prior art, the beneficial effects of the present invention are:

[0043] 1) The combined support in this invention adds expansion piles to the existing PC method piles to compensate for width errors. The connection of piles in the same direction is achieved by controlling the expansion and contraction of the width of the expansion piles. There is no need to consider the selection and quantity of different piles, so that the overall size of the support has more options.

[0044] 2) The telescopic pile in this invention is adjusted for telescopic movement by double-headed studs, which also serve to strengthen the support, giving the telescopic pile sufficient support strength.

[0045] 3) The construction method in this invention uses a specially designed guiding device and means, which can independently guide two piles with completely different structures and sizes, thereby improving the quality of large-size support construction.

[0046] 4) The guiding device in this invention has an adjustable function, which can be used for the installation of steel pipe piles and Larssen piles of different specifications, and has a wide range of applications. Attached Figure Description

[0047] Figure 1 This is a plan view of the combined support in this invention (with the internal support structure omitted).

[0048] Figure 2 for Figure 1 A partial three-dimensional view of the combined support shown;

[0049] Figure 3 for Figure 1 A partial top view of the combined support structure shown;

[0050] Figure 4 for Figure 1 Cross-sectional views of two types of steel pipe piles in the combined support shown;

[0051] Figure 5 forFigure 1 A schematic diagram illustrating the principle of the number of expansion piles in the combined support system shown.

[0052] Figure 6 This is a three-dimensional structural view of the guiding device in this invention;

[0053] Figure 7 for Figure 4 A side view of the structure of the guide device shown;

[0054] Figure 8 for Figure 5 Top view of the guide device shown;

[0055] Figure 9 for Figure 8 Structural sectional view along the AA direction;

[0056] Figure 10 for Figure 5 A side view of the internal components of the guide device shown;

[0057] Figure 11 for Figure 5 A three-dimensional view of the guide device during construction at the starting point;

[0058] Figure 12 for Figure 5 The top view of the guide device shown during construction at the starting point;

[0059] Figure 13 for Figure 5 A top view of the guide device during construction at the endpoint;

[0060] Figure 14 for Figure 5 The diagram shows the principle of the guiding device guiding the movement in cooperation with the traction device and the positioning column. Detailed Implementation

[0061] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] Taking the rectangular support construction scheme of a sports stadium foundation pit as an example, the excavation depth of the foundation pit is 2.700~9.650m, the perimeter of the foundation pit is about 514m, and the excavation area is about 13054㎡.

[0063] like Figures 1 to 4As shown in the figure, this embodiment discloses a Larssen pile and steel pipe pile combined support, including a retaining wall and a support assembly installed inside the retaining wall. The retaining wall includes Larssen piles 100, steel pipe piles 200 and expansion piles 300.

[0064] Steel pipe piles of type 200 are used at the corners of the retaining wall, while steel pipe piles of type 200, Larssen piles of type 100, and expansion piles of type 300 are used at other locations. Therefore, the steel pipe piles of type 200 have two types, such as... Figure 3 As shown, one type is a steel pipe pile 200 used for connecting the middle of the edge line, with the angle between the two tongue and groove joints 201 on it and the line connecting the center of the circle being 180°. The other type is a steel pipe pile 200 used for connecting the apex of the edge line, with the angle between the two tongue and groove joints 301 on it and the line connecting the center of the circle being 90°.

[0065] According to the design requirements, three Larssen piles 100 are connected between two steel pipe piles 200, and expansion piles 300 are set between the Larssen piles 100 and the steel pipe piles 200. Since the expansion piles 300 are used for width compensation to eliminate errors, the expansion piles 300 are installed last in each construction direction, and their number is determined according to the distance between the last Larssen pile 100 and the steel pipe pile 200.

[0066] The expansion joint 300 includes an "S"-shaped bent structure 301, a connecting plate 303, double-ended studs 304, and nuts 305. It should be noted that the thickness of the "S"-shaped bent structure 301 is 1 / 2 to 3 / 4 of the thickness of the Larssen pile 100, thus possessing good compressive deformation capacity. The two ends of the "S"-shaped bent structure 301 are respectively provided with first tongue-and-groove joints 302, which are adapted to the tongue-and-groove joints 101 on the Larssen pile 100 and 201 on the steel pipe pile 200, thereby forming a connection. The connecting plate 303 is symmetrically arranged on the same side of the "S"-shaped bent structure 301. The connecting plate 303 has 5-8 through holes evenly distributed along the height direction. The double-ended studs 304 pass through the through holes, and their two ends are fixed to the connecting plate 303 by nuts 305. Nut 305 is located on the outside of connecting plate 303. Rotating it and changing its installation position on the double-ended stud 304 alters the distance between the two connecting plates 303, thereby compressing the "S"-shaped bend structure 301 between the two connecting plates 303 and changing the width of the entire expansion joint 300. According to design requirements, the maximum width of the expansion joint 300 is equal to the width of the Larssen pile 100, and its minimum width is half the width of the Larssen pile 100. The thickness of the connecting plate 303 is 1.5 to 2 times the thickness of the "S"-shaped bend structure 301, thus providing strong anti-deformation capabilities and preventing it from being compressed and deformed during width adjustment. It should also be noted that because the "S"-shaped bend structure 301 has deformability, the double-ended stud 304 not only works with nut 305 to adjust the width of the "S"-shaped bend structure 301 but also provides support, improving the compressive strength on one side.

[0067] As a preferred example, the "S"-shaped bending structure 301 has nine bending structures 301a. Five of the bending structures 301a are located on the outer side, and the remaining four bending structures 301a are located on the inner side and are staggered with the remaining five bending structures 301a.

[0068] As a preferred example, the connecting plate 303 is located on the side of the "S"-shaped bent structure 301 with fewer bends. The purpose of this arrangement of the connecting plate 303 is to provide support for the first tongue and groove joint 302 as well.

[0069] like Figures 6 to 10 As shown, the present invention also provides a guiding device, including: a ground moving frame 401, a guide frame 404, a rotating frame 407, a rotating frame adjuster 410, a steel pipe pile positioning plate 408, a steel pipe pile positioning plate adjuster 413, and a Larssen pile positioning plate 409.

[0070] The ground-mounted mobile frame 401 is a rectangular frame with dimensions of 5000×1000×800mm (length×width×height), welded from galvanized square tubing of 50×50mm / 4mm thickness. Casters 402 are installed at the bottom of the ground-mounted mobile frame 401; these casters are fixed and therefore can only move forward and backward. The ground-mounted mobile frame 401 is 40cm off the ground. Two rails 403 are fixedly installed on each of the left and right sides of the ground-mounted mobile frame 401, one above the other. The rails 403 are made of 30×50mm / 3mm thick angle steel, with the wider side horizontal and the narrower side vertical. It should be noted that before use, the guide device in this invention can also be guided by excavating a guide groove in the ground, allowing the guide device 400 to move within the groove.

[0071] The guide frame 404 is a rectangular frame with dimensions of 1600×800×800mm (length×width×height), welded from 50×50mm / 4mm thick galvanized square tubing. Longitudinal rollers 405 and horizontal rollers 406 are installed at the four corners of both sides of the guide frame 404 for rolling connection to the track 403. The longitudinal rollers 405 roll in contact with the top surface of the horizontal plane of the track 403, and the horizontal rollers 406 roll in contact with the inner surface of the vertical plane of the track 403, thus enabling the guide frame 404 to move linearly on the ground-mounted frame 401. An "H"-shaped mounting bracket, also welded from 50×50mm / 4mm thick galvanized square tubing, is also provided at the center of both sides of the guide frame 404.

[0072] There are two rotating frames 407, which are “H” shaped structures welded from 50×50mm / 4mm thick galvanized square tubes. The middle part is provided with a rotating shaft 407a, which is installed in the central bearing of the horizontal tube 404a of the corresponding “H” shaped mounting frame, so that the rotating frame 407 can rotate in the vertical direction.

[0073] The steel pipe pile positioning plate 408 has an "I" shaped structure, welded from 50×50mm / 4mm thick galvanized square tubing and 50×50mm / 4mm thick galvanized angle steel. The steel pipe pile positioning plate 408 is slidably connected to a linear bearing in the vertical section of one end of the "H" shaped structural frame via two first guide posts 408a positioned one above the other on its back.

[0074] The Larssen pile positioning plate 409 has the same structure as the steel pipe pile positioning plate 408. The Larssen pile positioning plate 409 is mounted in a linear bearing on the vertical part of the "H"-shaped structural frame via two second guide posts 409a arranged one above the other on its back, forming a sliding connection. The length of the Larssen pile positioning plate 409 is not less than the width of two Larssen piles 100.

[0075] A steel pipe pile positioning plate adjuster 413 is installed at one end of the inner side of the rotating frame 407 to change the spacing of the steel pipe pile positioning plates 408. A Larssen pile positioning plate adjuster 414 is installed at the other end of the inner side of the rotating frame 407 to change the spacing of the Larssen pile positioning plates 409.

[0076] Specifically, the steel pipe pile positioning plate adjuster 413 and the Larssen pile positioning plate adjuster 414 are screw-nut mechanisms. The outer end of the screw of the steel pipe pile positioning plate adjuster 413 is equipped with a steel pipe pile adjusting handwheel 413a, and the outer end of the screw of the Larssen pile positioning plate adjuster 414 is equipped with a Larssen pile adjusting handwheel 414a. Rotating the handwheels drives the corresponding positioning plates to move closer or further apart, thus accommodating columns of different specifications.

[0077] The swivel frame adjuster 410 is installed on the left and right sides of the guide frame 404 to change the posture of the swivel frame 407. Specifically, the swivel frame adjuster 410 includes a lead screw nut 410d, a lead screw 410a, a gear 410b, a rack 410c, and a swivel frame adjusting handwheel 410e.

[0078] A lead screw nut 410d is mounted on an "H"-shaped mounting bracket of the guide frame 404. A lead screw 410a is mounted on the lead screw nut 410d, with its inner end extending into the horizontal tube 404a of the "H"-shaped mounting bracket. A gear 410b is also located in the horizontal tube 404a and is mounted on the portion of the rotating shaft 407a of the mounting bracket 407 that extends into the horizontal tube 404a. A rack 410c is slidably mounted in the horizontal tube 404a and meshes with the gear 410b on that side, with the end of the rack 410c connected to the inner end of the lead screw 410a on that side. A rotating bracket adjusting handwheel 410e is mounted on the outer end of the lead screw 410a. The entire rotating bracket 410 can be rotated by turning the rotating bracket adjusting handwheel 410e.

[0079] like Figure 11 and 12 As shown, when installing steel pipe piles 200 and Larssen piles 100, since the starting column is steel pipe pile 200, the rotating frame 407 is in the initial state. At this time, the steel pipe pile positioning plate 408 is behind and the Larssen pile positioning plate 409 is in front. The first steel pipe pile 200 is positioned by the steel pipe pile positioning plate 408. When the steel pipe pile positioning plate 408 contacts the outer circular surface of the steel pipe pile 200, the positioning is completed. Then the steel pipe pile 200 is inserted into the ground. Since the steel pipe pile positioning plate 408 has an "I" shaped structure, its upper and lower horizontal plates can ensure that the steel pipe pile 200 is inserted vertically into the ground.

[0080] When the steel pipe pile 200 is inserted to a certain depth, a Larssen pile 100 is picked up and installed. The same method is used to position its surface. After positioning, it is inserted to a certain depth, and then another Larssen pile 100 is picked up and installed, with the same method used to position its surface. At this point, the positioning device provides guidance for both the steel pipe pile 200 and the Larssen pile 100 in two directions: vertical and horizontal. The columns are installed sequentially using this method until the entire ground-mounted moving frame 401 is filled with columns. Then, the pile driver is used to drive the remaining columns to the designed depth, allowing the guiding device to move forward. This method can guide all the columns. Figure 12 As shown, it should be noted that when installing the second steel pipe pile 200, the rotating frame 407 needs to be rotated 180° so that the steel pipe pile positioning plate 408 is in front and the Larssen pile positioning plate 409 is behind. Then, the steel pipe pile positioning plate 408 can be used to position and guide the steel pipe pile 200. During construction, the steel pipe pile positioning plate 408 and the Larssen pile positioning plate 409 maintain a constant distance, ensuring that all piles can be installed sequentially along a pre-set straight line.

[0081] Compared with the prior art, the guiding device in this invention can guide the support construction of a single type of pile structure, or guide the combined support construction of two types of pile structures. It has a clever structure, is easy to operate, can be operated manually without the need for on-site cable laying, and can also be electrically driven to improve efficiency and reduce labor intensity.

[0082] The present invention also provides a construction method for forming the above-mentioned Larssen pile and steel pipe pile combined support, characterized by comprising the following steps:

[0083] Step 1: Determine the specifications, quantity, and distribution of the required Larssen piles (100mm), steel pipe piles (200mm), and expansion joints (300mm) for each edge of the retaining wall based on the design dimensions of the foundation pit. The distribution method is determined as follows:

[0084] S11. At the apex of the edge line, install the corresponding type of steel pipe pile 200. In the middle section of the edge line, install Larssen pile 100, another type of steel pipe pile 200, and expansion joint piles 300. The Larssen pile 100 is a No. III Larssen pile, 9m long, with a total weight of 116 tons. The steel pipe pile 200 is 630*12mm in size, 12m long, with a total weight of 376.08 tons. All materials will arrive on site two days in advance according to the construction schedule.

[0085] S12, such as Figure 5As shown, if the connection gap ΔL between the last Larssen pile 100 in the edge line and the steel pipe pile 200 at the end point satisfies the first condition, then an expansion pile 300 is connected between the two. If ΔL satisfies the second condition, then the last Larssen pile 100 is omitted and two expansion piles 300 are connected between the second-to-last Larssen pile 100 and the steel pipe pile 200.

[0086] The first condition is: 0.5L < ΔL < L, and the second condition is: 0 < ΔL < 0.5L, where L is the effective connection width of a single Larsen pile 100. In this example, the first condition is met, therefore one expansion pile 300 is connected to each edge line.

[0087] Step Two: Based on the design requirements of the foundation pit, select one vertex of one of the edge lines as the starting point, and insert positioning rods 600 at the remaining vertices. Using the guiding device 400, starting from the starting point, sequentially insert Larssen piles 100, expansion piles 300, and steel pipe piles 200 into the ground to form the retaining structure in a predetermined distribution and construction direction. In this step, the steel pipe piles 200 are installed using jet grouting technology. Jet grouting technology is existing technology and will not be described in detail. This step specifically includes the following steps:

[0088] S21, such as Figure 11 As shown, a guide device 400 is installed at the starting point corresponding to the current construction direction, and a traction device 500 is installed on the extension line of the corresponding ending point. The traction device 500 is connected to the guide device 400 through a traction steel rope 501. The traction device 500 can be a winch, and the guide device 400 is moved linearly by electric means.

[0089] S22. Under the guidance of the guiding device 400, after aligning the corresponding type of steel pipe pile 200 with the starting position, the pre-installation of the steel pipe pile 200 at the starting point is completed by using a jet grouting machine and a pile driving machine. That is, the steel pipe pile 200 is inserted into the ground to a certain depth, but not to the preset depth. The purpose is to maintain the positioning and guiding state and provide guidance for the subsequent installation of the pile body.

[0090] S23. Based on the working principle and method of the aforementioned guiding device 400, Larssen piles 100 and another type of steel pipe pile 200 are installed sequentially until the installation of the last Larssen pile 100 in the construction direction is completed. When the guiding frame 404 moves to the front end of the ground moving frame 401, the pre-installed piles are inserted one by one into the preset depth using a pile driving machine. Then, the ground moving frame 401 can move forward a certain distance to continue the guiding construction. During this process, the guiding device 400 is gradually pulled along the construction direction using the traction device 500. Figure 14As shown, during the traction process, the traction steel cable 501 remains in close contact with the positioning rod 600 to ensure that the guide device 400 moves in a straight line. It should be noted that the traction device 500 can be used manually, or the guide device 400 can be driven forward by hand without the traction device 500. The function of the traction device 500 is solely to better drive the guide device 400 to move.

[0091] S24. Before installing the last pile in the current construction direction, first pull out the positioning rod 600, flip the rotating frame 407 in the guide device 400, so that the steel pipe pile guide plate 408 comes to the front end, thereby positioning and guiding the steel pipe pile 200 that will be installed at the end point, and completing the installation of the last steel pipe pile 200 in the current construction direction.

[0092] S25. After adjusting the expansion pile 300 to a suitable width, insert it between the last Larsen pile 100 and the steel pipe pile 200 at the end point to complete the installation of all piles in this construction direction.

[0093] S26. Adjust the orientation of the guide device 400 to align it with the next construction direction, and simultaneously adjust the position of the traction device 500 to be on the extension line of the next endpoint. Repeat the above steps until all piles are installed to form the retaining wall.

[0094] Step 3: Excavate the portion within the retaining wall and install inner support components layer by layer according to the excavation depth to form a combined support system of Larssen piles and steel pipe piles. This step is existing technology and will not be described in detail.

[0095] Any aspects of this invention not described in detail are well-known to those skilled in the art.

[0096] In the description of this invention, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0097] In the description of this invention, unless otherwise stated, "a plurality of" means two or more. It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0098] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications and equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A guiding device, characterized in that: include: Ground mobile frame (401), the bottom of which is equipped with casters (402) and rails (403) are installed on its left and right sides. A guide frame (404) is provided with longitudinal rollers (405) and horizontal rollers (406) on both sides for rolling connection to the track (403). A rotating frame (407) is rotatably mounted on the left and right sides inside the guide frame (404); A rotating frame adjuster (410) is installed on the left and right sides of the guide frame (404) to change the posture of the rotating frame (407); A steel pipe pile positioning plate (408) is slidably installed at one end of the inner side of the rotating frame (407); A steel pipe pile positioning plate adjuster (413) is installed at one end of the inner side of the rotating frame (407) to change the spacing of the steel pipe pile positioning plates (408). Larssen pile positioning plate (409), which is slidably installed on the other end of the inner side of the rotating frame (407); Larssen pile positioning plate adjuster (414), which is installed on the other end of the inner side of the rotating frame (407) to change the spacing of the Larssen pile positioning plates (409).

2. The guiding device (400) according to claim 1, characterized in that: The rotating frame (407) is an "H" shaped structure frame. The steel pipe pile positioning plate (408) is installed on the vertical part of one end of the "H" shaped structure frame, and the Larsen pile positioning plate (409) is installed on the vertical part of the other end of the "H" shaped structure frame.

3. The guiding device (400) according to claim 1, characterized in that: The steel pipe pile positioning plate adjuster (413) and the Larsen pile positioning plate adjuster (414) are screw and nut mechanisms.

4. The guiding device (400) according to claim 1, characterized in that: The rotating frame adjuster (410) includes: A lead screw nut (410d) is mounted on the guide frame (404); A lead screw (410a) is mounted on a lead screw nut (410d); Gear (410b), said gear (410b) is mounted on a rotating shaft on one side of the rotating frame (407); A rack (410c) is slidably mounted on one side of the guide frame (404) and meshes with a gear (410b) on that side, and is connected to the inner end of a lead screw (410a) on that side. A rotating frame adjusting handwheel (410e) is installed at the outer end of the lead screw (410a).

5. A construction method for a Larssen pile and steel pipe pile combined support, constructed using a guiding device (400) as described in claim 1, wherein the Larssen pile and steel pipe pile combined support includes a retaining wall and a support assembly installed inside the retaining wall, wherein the retaining wall includes Larssen piles (100), steel pipe piles (200) and expansion piles (300), wherein at least one Larssen pile (100) is connected between two steel pipe piles (200), and the expansion pile (300) is disposed between the Larssen pile (100) and the steel pipe pile (200); The telescopic pile (300) includes an "S"-shaped bending structure (301), a connecting plate (303), a double-headed stud (304), and a nut (305); the two ends of the "S"-shaped bending structure (301) are respectively provided with a first tongue and groove (302), the connecting plate (303) is symmetrically provided on the same side of the "S"-shaped bending structure (301), the connecting plate (303) is provided with a plurality of through holes distributed along the height direction, the double-headed stud (304) passes through the through holes and its two ends are respectively fixed on the connecting plate (303) by the nut (305); The maximum width of the expansion joint (300) is equal to the width of the Larssen pile (100), and its minimum width is half the width of the Larssen pile (100); characterized in that: The construction method includes the following steps: Step 1: Determine the specifications, quantity, and distribution of Larssen piles (100), steel pipe piles (200), and expansion piles (300) required for each edge of the retaining wall based on the design dimensions of the foundation pit; the distribution method is determined according to the following method: Type 1 steel pipe piles (200) are installed at the apex of the edge line, and Larsen piles (100), Type 2 steel pipe piles (200) and expansion piles (300) are installed in the middle of the edge line. The angle between the two tongues and grooves on the steel pipe piles (200) used for connecting the middle of the edge line and the line connecting the center of the circle is 180°, and the angle between the two tongues and grooves on the steel pipe piles (200) used for connecting the apex of the edge line and the line connecting the center of the circle is 90°. If the connection gap ΔL between the last Larssen pile (100) in the sideline and the steel pipe pile (200) at the end point satisfies the first condition, then a telescopic pile (300) is connected between the two. If ΔL satisfies the second condition, then the last Larssen pile (100) is omitted and two telescopic piles (300) are connected between the second-to-last Larssen pile (100) and the steel pipe pile (200). The first condition is: 0.5L < ΔL < L, and the second condition is: 0 < ΔL < 0.5L, where L is the effective connection width of a single Larssen pile (100). Step 2: Select one of the edge lines as the starting point according to the design requirements of the foundation pit, and insert positioning rods (600) at the other vertices. Using the guiding device (400), Larsen piles (100), expansion piles (300) and steel pipe piles (200) are inserted into the ground in sequence from the starting point in a preset distribution and construction direction to form the retaining structure. Step 3: Excavate the portion within the enclosure and install inner support components layer by layer according to the excavation depth to form the combined support of Larssen piles and steel pipe piles.

6. A construction method according to claim 5, characterized in that: In step two, the steel pipe pile (200) is installed using jet grouting.

7. The construction method for a combined support system of Larssen piles and steel pipe piles according to claim 5, characterized in that: Step two includes the following steps: A guide device (400) is set at the starting point corresponding to the current construction direction, and a traction device (500) is installed on the extension line of the corresponding end point. Under the guidance of the guiding device (400), the first type of steel pipe pile (200) is aligned with the starting position and then installed. Under the guidance of the guide device (400), Larssen piles (100) and second type steel pipe piles (200) are installed in sequence until the installation of the last Larssen pile (100) in the construction direction is completed. During this process, the guide device (400) is gradually pulled along the construction direction by the traction device (500). Pull out the positioning rod (600), and under the guidance of the guiding device (400), align the first type of steel pipe pile (200) with the end position before proceeding with construction and installation; After adjusting the expansion pile (300) to the appropriate width, insert it between the last Larsen pile (100) and the steel pipe pile (200) at the end point to complete the installation in this construction direction; Adjust the orientation of the guide device (400) to align it with the next construction direction, and at the same time adjust the position of the traction device (500) to place it on the extension line of the next endpoint; Repeat the above process until installation is complete in all construction directions.

8. A construction method according to claim 5, characterized in that: The “S”-shaped bending structure (301) has an odd number of bending structures (301a).

9. A construction method according to claim 5, characterized in that: The connecting plate (303) is located on the side of the "S"-shaped bending structure (301) with fewer bending structures.

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