Combined retaining structure of micro-pile and anchor rod

Abstract

The utility model provides a kind of combined retaining structure of micro pile plus anchor rod belongs to foundation pit supporting technical field, including steel pipe pile, further include: rectangular steel pipe, insert in the inside of steel pipe pile, concrete crown beam, fixed in the outside of steel pipe pile top end, prestressed anchor rod is inserted in the inside of concrete crown beam, the side of concrete retaining board close to the top end of foundation pit cushion is equipped with water interception ditch, expansion structure, is set at the bottom of the outside of steel pipe pile, positioning structure, it is set at the outside of steel pipe pile.In the utility model, prestressed anchor rod and steel pipe pile are combined by concrete crown beam, give full play to the vertical supporting effect of steel pipe pile and the horizontal pull together effect of prestressed anchor rod, while crown beam has the double function of connecting steel pipe pile and being anchor block of anchor rod, whereby the function of the device efficient stable support foundation pit is realized, so that supporting structure rigidity is greater, integrity is stronger.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit support technology, specifically to a combined support structure of micropiles and anchor rods. Background Technology

[0002] In slope reinforcement, foundation pit support and other projects, complex geological conditions, limited space, or the need to control structural deformation are often encountered. A single retaining structure is difficult to balance bearing capacity, stability and construction convenience. Therefore, a combined retaining structure of micropiles and anchor rods is set up. The micropiles are used to quickly form an anti-sliding or anti-overturning skeleton, and the anchor rods are used for deep anchoring to transfer loads. This synergistically improves the overall stiffness and deformation resistance of the retaining system and ensures the safety and stability of the project.

[0003] Chinese patent CN210737585U discloses a retaining structure comprising: a retaining wall with a sloping back slope; a foundation connected to the retaining wall; and multiple piles connected to the foundation and located on the side of the foundation away from the retaining wall; the piles are at least anchored in strongly weathered rock strata. This invention effectively overcomes the shortcomings of retaining structures that cannot meet technical requirements under limited land and space conditions, thus avoiding significant increases in project costs due to changes in the engineering plan. This retaining structure can effectively reinforce slopes and steep slopes near confined areas, while also being structurally sound, simple in structure, and exhibiting good long-term stability.

[0004] The aforementioned patent still has the following shortcomings: Traditional foundation pit support methods mainly include separate prestressed anchor support and separate steel pipe pile support. However, when faced with large earth pressure, the stiffness of separate prestressed anchor support is relatively small, and the deformation control of the foundation pit is not strict enough, which can easily lead to excessive displacement of the foundation pit and adversely affect surrounding buildings, underground pipelines, etc. While separate steel pipe pile support has a certain degree of stiffness, in cases where the foundation pit is deep or the soil quality is poor, it is difficult to effectively control the deformation by relying solely on the bending stiffness of the steel pipe piles themselves, and a large number of steel pipe piles may be required, which increases the project cost and construction difficulty. Utility Model Content

[0005] This utility model provides a combined support structure of micropiles and anchor rods, which solves the problem mentioned in the background art where the stiffness of individual prestressed anchor rod support is relatively small when facing large earth pressure, the control of foundation pit deformation is not strict enough, and excessive displacement of the foundation pit is prone to occur, which will have an adverse impact on surrounding buildings, underground pipelines, etc. While individual steel pipe pile support has a certain stiffness, in the case of large foundation pit depth or poor soil quality, the bending stiffness of the steel pipe pile itself is not enough to effectively control the deformation.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: An embodiment of this utility model provides a combined retaining structure of micropiles and anchor bolts, including steel pipe piles, and further including: A rectangular steel pipe is inserted inside the steel pipe pile; A concrete cap beam is fixed to the outside of the top of the steel pipe pile. Prestressed anchor rods are inserted inside the concrete cap beam, and an anchor plate is fixed inside one side of the concrete cap beam. A concrete retaining wall is installed on one side of the steel pipe pile. The bottom end of the concrete retaining wall is provided with foundation pit padding, and the top of the foundation pit padding is provided with a drainage ditch on the side close to the concrete retaining wall. An expansion structure is provided at the bottom of the outer side of the steel pipe pile. The expansion structure includes a hinge seat fixed on the outer wall of the rectangular steel pipe. A transmission rod is connected to the rotating end of the hinge seat. An expansion blade is rotatably connected to one side of the transmission rod. A pin shaft rotatably connected to the steel pipe pile is fixed inside the bottom end of the expansion blade. A receiving groove is provided on the outer wall of the steel pipe pile. The positioning structure is set on the outside of the steel pipe pile and is used to position the concrete retaining plate and the steel pipe pile during construction.

[0007] The above technical solution combines prestressed anchors and steel pipe piles with a concrete cap beam, giving full play to the vertical support function of the steel pipe piles and the horizontal tie function of the prestressed anchors. At the same time, the cap beam has the dual function of connecting steel pipe piles and serving as an anchoring pier for anchors. Furthermore, the steel pipe piles and prestressed anchors can be flexibly arranged according to the geology, depth, and surrounding environment of the foundation pit.

[0008] Furthermore, the positioning structure includes a fixing ring sleeved on the outside of one of the sets of steel pipe piles, a connecting sleeve fixed on one side of the fixing ring, a rotating sleeve rotatably connected on one side of the connecting sleeve, a threaded rod threadedly connected to the rotating sleeve inserted inside the connecting sleeve, a connecting ring fixed on one side of the threaded rod, and a positioning pin fixed on one side of the connecting ring.

[0009] The above technical solution fixes the position between two adjacent sets of steel pipe piles by placing the fixing ring and connecting ring on the outside of the steel pipe pile, and positions the concrete retaining plate by having the positioning pin contact the bidirectional steel bars inside the concrete retaining plate.

[0010] Furthermore, a locking bolt is threaded to the side of the connecting ring, and the locking bolt extends into the interior of the connecting ring to connect with the steel pipe pile.

[0011] The above technical solution can firmly fix the connecting ring and positioning pin to the steel pipe pile, avoid displacement of the connecting ring during construction, ensure the positioning accuracy of the positioning structure on the concrete retaining plate, and improve the installation stability of the support structure.

[0012] Furthermore, one end of the prestressed anchor rod extends into the interior of the concrete cap beam and is anchored to the anchor plate, while the other end of the prestressed anchor rod is anchored into the soil or rock layer of the pit sidewall.

[0013] The above technical solution ensures that the two ends of the prestressed anchor rod are stably fixed, and the prestress is transferred by the anchoring force formed by grouting, which effectively balances the lateral pressure of the soil on the side wall of the foundation pit and enhances the lateral displacement resistance of the support structure.

[0014] Furthermore, the interior of the rectangular steel pipe and the gap between the rectangular steel pipe and the steel pipe pile are filled with concrete filler.

[0015] The above technical solution can fill the gap between the steel pipe pile and the rectangular steel pipe, and the two work together to improve the overall rigidity and bearing capacity of the steel pipe pile, avoid deformation of the steel pipe pile under stress, and provide a stable foundation support for the support structure.

[0016] Furthermore, the concrete cap beam is provided with longitudinal reinforcing bars and stirrups, and the top of the steel pipe pile is fixed with an embedded part, and the longitudinal reinforcing bars and the embedded part are welded together.

[0017] The above technical solutions enable the concrete capping beam and steel pipe piles to be tightly connected as a whole. The stirrups and longitudinal reinforcing bars enhance the load-bearing performance of the capping beam, improve the overall stiffness of the pile group, and ensure the integrity of the support system.

[0018] Furthermore, the concrete retaining slab is internally reinforced with double-layer bidirectional steel bars, and the horizontal steel bars are welded to the outer wall of the steel pipe pile.

[0019] The above technical solutions enhance the crack resistance and load-bearing capacity of the concrete retaining slab, ensuring a firm connection with the steel pipe piles, preventing displacement of the retaining slab, and effectively preventing the collapse of the soil on the side wall of the foundation pit.

[0020] The above-described solution of this utility model has at least the following beneficial effects: This invention, through a combined steel pipe pile and anchor bolt support structure, with a reinforced concrete capping beam as the core connecting carrier, successfully achieves the complementary and synergistic effects of prestressed anchor bolts and steel pipe piles. The steel pipe piles adopt an outer circle and inner combination structure, and with their excellent vertical bearing capacity, they form a stable pile group after being vertically driven into the soil layer of the foundation pit sidewall, providing reliable vertical support for the support system. The prestressed anchor bolts, by anchoring one end into the stable soil or rock layer of the foundation pit sidewall and the other end tightly anchored to the capping beam, play a horizontal tying role, actively offsetting the lateral pressure of the soil on the support structure. At the same time, the capping beam is connected to the top of the steel pipe piles by internal longitudinal reinforcing bars. By welding the steel pipe piles together, the spaced steel pipe piles are connected into a whole, which greatly enhances the integrity and rigidity of the pile group. They also serve as anchoring piers for the anchor rods, eliminating the need to build separate anchoring bases for the anchor rods, reducing construction procedures and material consumption. At the same time, the spacing and length of the steel pipe piles can be flexibly adjusted according to the geological conditions of the foundation pit, and the anchoring depth and tension of the prestressed anchor rods can also be precisely adapted to the depth of the foundation pit and the distribution of surrounding buildings and underground pipelines. Ultimately, the support structure has both high rigidity and strong integrity, which can strictly control the lateral displacement of the foundation pit, effectively protect the safety of the surrounding environment, and reduce engineering costs and improve construction efficiency while improving the stability of the support.

[0021] This invention uses a hinged seat to drive a transmission rod, which in turn drives an extended blade to rotate around a pin shaft. This causes the blade to unfold from the receiving groove and embed into the soil layer, increasing the contact area between the bottom of the steel pipe pile and the soil. This enhances the pull-out and overturning resistance of the steel pipe pile, effectively preventing displacement of the steel pipe pile under load, further improving the overall stability of the support structure, providing more reliable foundation support for foundation pit construction, and adapting to the support requirements under complex soil conditions.

[0022] This invention utilizes a rotating sleeve to drive a lead screw to push a connecting ring, which, in conjunction with locking bolts, secures the position. A positioning pin ensures the installation accuracy of the concrete retaining plate. This allows the device to precisely position the retaining plate and connect it to the steel pipe pile, preventing the retaining plate from shifting during construction, ensuring a firm connection between the two, improving the overall integrity of the support system, reducing safety hazards caused by construction errors, and guaranteeing the effectiveness of foundation pit support. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 In this utility model Figure 1 Another structural diagram from another angle; Figure 3 A three-dimensional structural diagram of the positioning structure provided by this utility model; Figure 4 A three-dimensional cross-sectional structural diagram of the expansion structure provided by this utility model; Figure 5 A three-dimensional structural schematic diagram of the steel pipe pile provided by this utility model.

[0024] Explanation of reference numerals in the attached figures: 1. Steel pipe pile; 2. Concrete cap beam; 3. Prestressed anchor rod; 4. Anchor plate; 5. Concrete retaining wall; 6. Interception ditch; 7. Foundation pit filling soil; 8. Positioning structure; 801. Fixing ring; 802. Connecting sleeve; 803. Rotating sleeve; 804. Screw rod; 805. Locking bolt; 806. Connecting ring; 807. Positioning pin; 9. Expansion structure; 901. Expansion blade; 902. Transmission rod; 903. Hinge seat; 904. Pin shaft; 905. Receiving groove; 10. Rectangular steel pipe; 11. Concrete filling body. Detailed Implementation

[0025] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0026] like Figures 1 to 5 As shown, an embodiment of this utility model provides a combined retaining structure of micropile and anchor bolt, including a steel pipe pile 1, and further comprising: A rectangular steel pipe 10 is inserted inside the steel pipe pile 1; A concrete cap beam 2 is fixed to the outer side of the top of the steel pipe pile 1. A prestressed anchor rod 3 is inserted inside the concrete cap beam 2, and an anchor plate 4 is fixed inside one side of the concrete cap beam 2. A concrete retaining wall 5 is installed on one side of the steel pipe pile 1. A foundation pit pad 7 is provided at the bottom end of the concrete retaining wall 5. A water interception ditch 6 is installed on the top side of the foundation pit pad 7 near the concrete retaining wall 5. Positioning structure 8 is set on the outside of steel pipe pile 1 and is used to position the concrete retaining plate 5 and steel pipe pile 1 during construction. One end of the prestressed anchor rod 3 extends into the interior of the concrete cap beam 2 and is anchored to the anchor plate 4. The other end of the prestressed anchor rod 3 is anchored into the soil or rock layer of the pit sidewall. The interior of the rectangular steel pipe 10 and the gap between the rectangular steel pipe 10 and the steel pipe pile 1 are filled with concrete filler 11. The interior of the concrete cap beam 2 is provided with longitudinal reinforcing bars and stirrups. The top of the steel pipe pile 1 is fixed with an embedded part, and the longitudinal reinforcing bars are welded to the embedded part. The interior of the concrete retaining plate 5 is provided with double-layer bidirectional reinforcing bars, and the horizontal reinforcing bars are welded to the outer wall of the steel pipe pile 1.

[0027] In this embodiment of the utility model, before the excavation of the foundation pit, the construction of steel pipe piles 1 is carried out first. The steel pipe piles 1 are vertically driven into the soil layer of the foundation pit sidewall, and concrete filling body 11 is poured inside the steel pipe piles 1. The construction of steel pipe piles is completed one by one to form a pile group. After the concrete filling body 11 inside the steel pipe reaches the design strength, a concrete cap beam 2 is poured on top of the steel pipe piles. The concrete cap beam 2 connects the pile group into a whole, strengthening the rigidity. The anchor rod body can be made of high-strength threaded steel bars or steel strands, etc., and forms an anchoring force with the soil or rock mass through grouting and other processes, transferring the prestress to the stable stratum. The prestress is applied to the anchor rod body using tensioning equipment, so that the anchor rod generates prestress, thereby balancing the lateral pressure of the foundation pit sidewall soil on the support structure. After the grouting liquid of the prestressed anchor rod 3 reaches the design strength, the foundation pit is excavated from top to bottom. The concrete retaining wall 5 is constructed between the steel pipe piles, followed by excavation of the foundation pit to the foundation pit fill soil 7. A water interception ditch 6 is constructed at the bottom of the foundation pit. The steel pipe piles 1 provide basic support for the support structure. At the same time, the rectangular steel pipes 10 and the concrete filling body 11 enhance its bearing capacity. The concrete cap beam 2 is connected to the pile group to form an integral whole, improving the rigidity of the support system. The prestressed anchor rods 3 form an anchoring force with the stratum through grouting. The prestress applied by tension balances the lateral pressure of the foundation pit sidewall. The anchor plate 4 ensures the anchoring stability of the anchor rods. The concrete retaining wall 5 is connected to the steel pipe piles 1 by steel bars to prevent soil collapse. The foundation pit fill soil 7 provides basic support for the bottom of the foundation pit. The water interception ditch 6 drains accumulated water.

[0028] like Figures 1 to 5 As shown, the expansion structure 9 is set at the bottom of the outer side of the steel pipe pile 1. The expansion structure 9 includes a hinge seat 903 fixed on the outer wall of the rectangular steel pipe 10. The rotating end of the hinge seat 903 is connected to a transmission rod 902. An expansion blade 901 is rotatably connected to one side of the transmission rod 902. A pin 904 rotatably connected to the steel pipe pile 1 is fixed inside the bottom end of the expansion blade 901. A receiving groove 905 is opened on the outer wall of the steel pipe pile 1. In this embodiment of the utility model, after the steel pipe pile 1 is constructed, the rectangular steel pipe 10 is pressed by the equipment, causing it to move through the hinge seat 903 and push the transmission rod 902. Then, the transmission rod 902 drives the extension blade 901 to rotate around the pin shaft 904, so that the extension blade 901 unfolds from the receiving groove 905 on the outer wall of the steel pipe pile 1. After unfolding, the extension blade 901 will be embedded in the surrounding soil layer. Through the contact action between the extension blade 901 and the soil layer, the contact area between the bottom of the steel pipe pile 1 and the soil is increased to a certain extent, thereby improving the pull-out resistance and overturning stability of the steel pipe pile 1 in the soil layer, preventing the steel pipe pile 1 from displacing when subjected to lateral pressure or vertical load, and further ensuring the stability of the entire support structure.

[0029] like Figures 1 to 4As shown, the positioning structure 8 includes a fixing ring 801 sleeved on the outside of one of the steel pipe piles 1. A connecting sleeve 802 is fixed to one side of the fixing ring 801. A rotating sleeve 803 is rotatably connected to one side of the connecting sleeve 802. A lead screw 804 threadedly connected to the rotating sleeve 803 is inserted inside the connecting sleeve 802. A connecting ring 806 is fixed to one side of the lead screw 804. A positioning pin 807 is fixed to one side of the connecting ring 806. A locking bolt 805 is threadedly connected to the side of the connecting ring 806, and the locking bolt 805 extends into the interior of the connecting ring 806 and connects to the steel pipe pile 1.

[0030] In this embodiment of the invention, before constructing the concrete retaining wall 5, a fixing ring 801 is first fitted onto the outside of one set of steel pipe piles 1 to keep the fixing ring 801 relatively stable with the steel pipe piles 1. Then, by rotating the rotating sleeve 803, the lead screw 804 moves along the axial direction of the connecting sleeve 802. At the same time, the movement of the lead screw 804 pushes the connecting ring 806 fixedly connected to it, so that the connecting ring 806 contacts the other set of steel pipe piles 1. Immediately afterwards, the locking bolt 805 on the side of the connecting ring 806 is rotated, so that the locking bolt 805 extends into the interior of the connecting ring 806 and engages with the steel pipe pile 1. The tight connection fixes the positions of the connecting ring 806 and the positioning pin 807, thus fixing the position between the two adjacent sets of steel pipe piles 1. During the construction of the concrete retaining plate 5, the positioning pin 807 contacts the bidirectional steel bars inside the concrete retaining plate 5 to position the concrete retaining plate 5, which to a certain extent ensures the installation accuracy between the concrete retaining plate 5 and the steel pipe pile 1, avoids the positional deviation of the concrete retaining plate 5 during construction, and ensures that the concrete retaining plate 5 can be accurately connected to the steel pipe pile 1, further improving the integrity and stability of the entire support structure.

[0031] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A combined retaining structure of micropiles and anchors, comprising steel pipe piles (1), characterized in that, Also includes: A rectangular steel pipe (10) is inserted inside the steel pipe pile (1); A concrete cap beam (2) is fixed on the outer side of the top of the steel pipe pile (1). A prestressed anchor rod (3) is inserted inside the concrete cap beam (2). An anchor plate (4) is fixed inside one side of the concrete cap beam (2). A concrete retaining wall (5) is set on one side of the steel pipe pile (1). A foundation pit cushion (7) is set at the bottom end of the concrete retaining wall (5). A water interception ditch (6) is installed on the top side of the foundation pit cushion (7) near the concrete retaining wall (5). An expansion structure (9) is provided at the bottom of the outer side of the steel pipe pile (1). The expansion structure (9) includes a hinge seat (903) fixed on the outer wall of the rectangular steel pipe (10). The rotating end of the hinge seat (903) is connected to a transmission rod (902). An extension blade (901) is rotatably connected to one side of the transmission rod (902). A pin (904) rotatably connected to the steel pipe pile (1) is fixed inside the bottom end of the extension blade (901). A receiving groove (905) is provided on the outer wall of the steel pipe pile (1). The positioning structure (8) is set on the outside of the steel pipe pile (1) and is used to position the concrete retaining plate (5) and the steel pipe pile (1) during construction.

2. The combined support structure of micropiles and anchors according to claim 1, characterized in that, The positioning structure (8) includes a fixing ring (801) sleeved on the outside of one of the steel pipe piles (1), a connecting sleeve (802) fixed on one side of the fixing ring (801), a rotating sleeve (803) rotatably connected on one side of the connecting sleeve (802), a screw rod (804) threadedly connected to the rotating sleeve (803) inserted inside the connecting sleeve (802), a connecting ring (806) fixed on one side of the screw rod (804), and a positioning pin (807) fixed on one side of the connecting ring (806).

3. The combined support structure of micropiles and anchors according to claim 2, characterized in that, The connecting ring (806) is threaded with a locking bolt (805) on its side, and the locking bolt (805) extends into the interior of the connecting ring (806) and connects to the steel pipe pile (1).

4. The combined support structure of micropiles and anchors according to claim 1, characterized in that, One end of the prestressed anchor rod (3) extends into the interior of the concrete cap beam (2) and is anchored to the anchor plate (4), while the other end of the prestressed anchor rod (3) is anchored into the soil or rock layer of the pit sidewall.

5. The combined support structure of micropiles and anchors according to claim 1, characterized in that, The interior of the rectangular steel pipe (10) and the gap between the rectangular steel pipe (10) and the steel pipe pile (1) are filled with concrete filler (11).

6. The combined support structure of micropiles and anchors according to claim 1, characterized in that, The concrete cap beam (2) is provided with longitudinal reinforcing bars and stirrups, and the top of the steel pipe pile (1) is fixed with an embedded part, and the longitudinal reinforcing bars and the embedded part are welded together.

7. The combined support structure of micropiles and anchors according to claim 1, characterized in that, The concrete retaining wall (5) is internally reinforced with double-layer bidirectional steel bars, and the horizontal steel bars are welded to the outer wall of the steel pipe pile (1).

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