Construction method of hot melting type recoverable anchor cable

Abstract

The invention relates to the field of anchor cables, in particular to a construction method of a hot melting type recoverable anchor cable, which comprises the following steps: an anchor cable body extends into an anchor cable insertion hole from an end opening of the anchor cable insertion hole until an elastic steel sheet extends into a limiting clamping groove, at the moment, the elastic steel sheet is reset after losing extrusion force, and a spring extends to prop against the elastic steel sheet to be clamped in the limiting clamping groove; limiting lead screws are sequentially screwed into third threaded holes, connecting lead screws are sequentially screwed into second threaded holes, and then a pulling and fixing plate is vertically placed into an end mounting groove. The connecting lead screw continues to be rotated inwards to enable the inner end of the connecting lead screw to be screwed into the first threaded hole of the connecting plate, so that the anchor cable body is further pulled and fixed, and the anchor cable body is firmly fixed to the prefabricated concrete pouring base; connection is conducted in two connection modes, good and firm pulling force can be provided, construction and recovery steps are simple and fast, no metal connecting piece is left, and therefore the requirement for thorough recovery is met.

Description

Technical Field

[0001] The invention relates to the field of anchor cables and construction methods thereof, in particular to a construction method of a hot-melt recyclable anchor cable. Background Art

[0002] In urban foundation pit support projects, support piles and anchor cables are often used as temporary support structures for the foundation pit. Once the foundation pit is backfilled, the function of the anchor cable becomes invalid, but the anchor cable is permanently left underground, which not only pollutes the underground space, but also wastes resources and materials.

[0003] With the modernization of cities, the development and utilization of underground space has become a hot topic, and the prestressed steel strands left underground have brought difficulties to the development of underground space. For example, the construction of urban underground rail transit is in full swing. When the shield machine passes through the existing anchor cable group, the shield machine blade will be stuck by the anchor cable, causing the cutter head to be unable to rotate normally, resulting in large economic losses. Therefore, for many planned foundation pit projects on the planned subway lines, if the pile-anchor support structure is adopted, local regulations require that the anchor cables must be recyclable. Hot-melt anchor cables are one of the more commonly used recyclable anchor cables, but the existing hot-melt anchor cables only rely on simple connection methods, which is difficult to provide good and reliable pulling force, and the construction is relatively cumbersome. Moreover, its connection parts are not convenient for quick recovery, and it is easy to leave metal connectors, which cannot meet the needs of complete recovery.

[0004] In view of this, we propose a construction method of a hot-melt recyclable anchor cable to solve the problems existing in the existing device. Summary of the invention

[0005] The object of the present invention is to provide a construction method of a hot-melt recyclable anchor cable to solve the problems raised in the above-mentioned background technology. To achieve the above-mentioned object, the present invention provides the following technical solutions: a hot-melt recyclable anchor cable, comprising a precast concrete casting base, an anchor cable body, a hot-melt metal rod, an end rod, a connecting plate, a heating ring and a reinforcing plate, an anchor cable insertion hole is provided inside the precast concrete casting base and along the center thereof, an anchor cable body is inserted into the anchor cable insertion hole, the insertion end of the anchor cable body is fixedly connected to the hot-melt metal rod, the other end of the hot-melt metal rod is fixedly connected to the end rod, the other end of the end rod is welded and fixed to the connecting plate, the outer side of the hot-melt metal rod is sleeved and fixed with a heating ring, and a reinforcing plate for fixing the connecting plate is also provided in the precast concrete casting base.

[0006] Preferably, an end mounting groove is further provided on the end surface of the precast concrete casting base, the tie plate is located in the end mounting groove, and the outer port of the end mounting groove is also covered with a precast concrete baffle.

[0007] Preferably, two groups of limit slots are provided on the inner wall of the anchor cable insertion hole close to the tensioning plate, and inner sliding grooves connected to the limit slots are respectively provided on the upper and lower inner walls of the anchor cable insertion hole, and two groups of elastic steel sheets are respectively welded on the upper and lower surfaces of the end rod, and the elastic steel sheets can extend into the corresponding limit slots along the corresponding inner sliding grooves.

[0008] Preferably, the heating ring is also connected to a wire, and a protective sleeve is sleeved and fixed at the connection between the wire and the heating ring.

[0009] Preferably, four threaded holes 1 are formed on the connecting plate, four threaded holes 2 corresponding to the positions of the threaded holes 1 are formed in the middle of the securing plate, and four threaded holes 3 are further formed at the outer edge of the securing plate.

[0010] Preferably, a connecting screw rod is inserted into the second threaded hole, and a limiting screw rod is inserted into the third threaded hole.

[0011] Preferably, a spring is fixed to the bottom of the elastic steel sheet, and the spring is in a compressed state.

[0012] The construction method of the above-mentioned hot-melt recyclable anchor cable comprises the following steps: Step 1: Extend the anchor cable body from the end of the anchor cable insertion hole to the inside thereof, and the upper and lower inner walls of the anchor cable insertion hole squeeze the elastic steel sheet and the spring. After the two are deformed, the anchor cable body continues to be pushed inward until the elastic steel sheet extends into the limit card slot. At this time, the elastic steel sheet loses the squeezing force and resets, and the spring stretches and presses the elastic steel sheet to be stuck in the limit card slot; Step 2: Screw the limit screw into the threaded hole 3 in sequence, screw the connecting screw into the threaded hole 2 in sequence, and then put the tensioning plate into the end installation groove; Step 3: Continue to rotate the connecting screw rod inwards to allow its inner end to be screwed into the threaded hole 1 of the connecting plate, thereby further tightening the anchor cable body and firmly fixing the anchor cable body on the precast concrete pouring base; Step 4: Cover the precast concrete baffles on the end mounting grooves and seal the gaps with concrete; Step 5: Dig a foundation pit and bury the precast concrete base in the pit.

[0013] Compared with the prior art, the invention has the beneficial effects.

[0014] In the present invention, an anchor cable insertion hole is opened in the precast concrete casting base, a limit slot is opened on the inner wall of the anchor cable insertion hole, an elastic steel sheet is arranged on the anchor cable body, and after the anchor cable body is pushed in, the elastic steel sheet is stuck in the limit slot to realize the connection between the anchor cable body and the precast concrete casting base.

[0015] In the present invention, a hot-melt metal rod is arranged between the anchor cable body and the end rod, and a heating ring is sleeved on the outside of the hot-melt metal rod. When recycling, the hot-melt metal rod is heated and melted by the heating ring, so that the anchor cable body is separated from the precast concrete casting base, and the anchor cable body can be pulled out and recycled.

[0016] In the present invention, a tensioning plate is arranged in the end mounting groove, a connecting plate is arranged on the end rod, and the connecting plate is connected to the tensioning plate by a connecting screw rod, so as to further tension the anchor rod body and increase the overall firmness. At the same time, the connecting part can be pulled out and recovered from the rear end of the precast concrete casting base, so that the anchor rod body and the connecting part can be fully recovered.

[0017] In the present invention, two connection methods are used to connect, which can provide good and reliable pulling force, and the construction and recycling steps are simple and fast, and no metal connecting parts will remain, thereby achieving the need for complete recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the connection between the connecting plate and the tensioning plate in the present invention; Figure 3 It is a structural schematic diagram of the position of the hot-melt metal rod in the present invention; Figure 4 It is a structural schematic diagram of the precast concrete casting base in the present invention from the left side; Figure 5 It is a structural schematic diagram of the side surface of the connecting plate in the present invention; Figure 6 It is a structural schematic diagram of the side surface of the tensioning plate in the present invention; Figure 7 For the present invention Figure 2 Schematic diagram of the structure enlarged at point A in the middle.

[0019] In the figure: 1. Precast concrete casting base; 2. Anchor cable insertion hole; 3. End mounting groove; 4. Precast concrete baffle; 5. Limiting slot; 6. Inner slide groove; 7. Anchor cable body; 8. Hot-melt metal rod; 9. End rod; 10. Connecting plate; 11. Heating ring; 12. Protective sleeve; 13. Wire; 14. Elastic steel sheet; 15. Tie plate; 16. Limiting screw rod; 17. Connecting screw rod; 18. Threaded hole one; 19. Threaded hole two; 20. Threaded hole three; 21. Spring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figures 1 to 7 The present invention provides a technical solution: a hot-melt recyclable anchor cable, comprising a precast concrete casting base 1, an anchor cable body 7, a hot-melt metal rod 8, an end rod 9, a connecting plate 10, a heating ring 11 and a reinforcing plate 15. An anchor cable insertion hole 2 is opened inside the precast concrete casting base 1 and along the center thereof, and the anchor cable body 7 is inserted into the anchor cable insertion hole 2. The insertion end of the anchor cable body 7 is fixedly connected with the hot-melt metal rod 8, and the other end of the hot-melt metal rod 8 is fixedly connected with the end rod 9. The other end of the end rod 9 is welded and fixed with a connecting plate 10, and the outer side of the hot-melt metal rod 8 is sleeved and fixed with a heating ring 11. A reinforcing plate 15 for fixing the connecting plate 10 is also arranged in the precast concrete casting base 1, so as to realize multiple connection modes, increase the firmness of the overall connection, and facilitate complete recycling without residual metal connectors.

[0022] In this embodiment, an end mounting groove 3 is further opened on the end surface of the precast concrete casting base 1, the tensioning plate 15 is located in the end mounting groove 3, and the outer port of the end mounting groove 3 is also covered with a precast concrete baffle 4. The rear end of the precast concrete casting base 1 adopts a sealed structural design to prevent rainwater from entering the end mounting groove 3, which is beneficial to protecting the connecting parts.

[0023] In this embodiment, two groups of limit slots 5 are further provided on the inner wall of the anchor cable insertion hole 2 near the tensioning plate 15, and inner slide grooves 6 connected to the limit slots 5 are respectively provided on the upper and lower inner walls of the anchor cable insertion hole 2. Two groups of elastic steel sheets 14 are respectively welded on the upper and lower surfaces of the end rod 9, and the elastic steel sheets 14 can extend into the corresponding limit slots 5 along the corresponding inner slide grooves 6, and are connected in a clamping manner, which is convenient for quick pulling out and recovery.

[0024] In this embodiment, a wire 13 is further connected to the heating ring 11 , and a protective sleeve 12 is sleeved and fixed at the connection between the wire 13 and the heating ring 11 for energizing the heating ring 11 .

[0025] In this embodiment, four threaded holes 18 are provided on the connecting plate 10, four threaded holes 19 corresponding to the positions of the threaded holes 18 are provided in the middle of the reinforcing plate 15, and four threaded holes 3 20 are provided at the outer edge of the reinforcing plate 15, a connecting screw 17 is inserted into the threaded hole 19, and a limiting screw 16 is inserted into the threaded hole 3 20, and threaded connection is adopted for easy recovery.

[0026] In this embodiment, a spring 21 is fixed to the bottom of the elastic steel sheet 14 , and the spring 21 is in a compressed state. After the anchor cable body 7 is connected in place, the limiting slot 5 can be used to firmly clamp the elastic steel sheet 14 .

[0027] The construction method of the above-mentioned hot-melt recyclable anchor cable comprises the following steps: Step 1: Extend the anchor cable body 7 from the end of the anchor cable insertion hole 2 to the inside thereof, and the upper and lower inner walls of the anchor cable insertion hole 2 squeeze the elastic steel sheet 14 and the spring 21. After the two are deformed, the anchor cable body 7 continues to be pushed inward until the elastic steel sheet 14 extends into the limit card slot 5. At this time, the elastic steel sheet 14 loses the squeezing force and resets, and the spring 21 stretches and presses the elastic steel sheet 14 to be stuck in the limit card slot 5; Step 2: screw the limit screw 16 into the threaded hole 20 in sequence, screw the connecting screw 17 into the threaded hole 19 in sequence, and then put the tensioning plate 15 upright into the end mounting groove 3; Step 3: Continue to rotate the connecting screw rod 17 inward to allow its inner end to be screwed into the threaded hole 18 of the connecting plate 10, thereby further tightening the anchor cable body 7 and firmly fixing the anchor cable body 7 on the precast concrete casting base 1.

[0028] Step 4: Cover the precast concrete baffle 4 on the end mounting groove 3 and seal the gap with concrete pouring; Step 5: excavate a foundation pit and bury the precast concrete casting base 1 in the foundation pit.

[0029] Working principle: During the anchoring stage, each elastic steel sheet 14 is stuck in the corresponding limit slot 5, and the connecting plate 10 is firmly connected to the tensioning plate 15. When the anchor cable body 7 is subjected to outward pulling force, the limit slot 5 limits the elastic steel sheet 14 to prevent it from being pulled outward. At the same time, the tensioning plate 15 can further prevent the pulling of the anchor cable body 7. The two connection methods can provide good and reliable pulling force.

[0030] Recycling stage: dig up the foundation to expose the precast concrete casting base 1, smash the precast concrete baffle 4 with a hammer, connect the wire 13 to the controller and the power supply, energize the heating ring 11, and the heating ring 11 continuously heats the hot-melt metal rod 8 to melt it, so that the inner end of the anchor cable body 7 is disconnected from the end rod 9, and the connecting section of the anchor cable body 7 can be pulled out from the precast concrete casting base 1, and then the tensioning plate 15 is pulled outward, and the bottom of the limit slot 5 squeezes the elastic steel sheet 14 downward, and the spring 21 is compressed, so that the end rod 9 can be pulled out from the precast concrete casting base 1, so that the anchor cable body 7 and its connecting part are completely separated from the precast concrete casting base 1, so as to realize the complete recycling of the anchor cable body 7 and the connecting part. The recycling steps are simple and fast, and no metal connectors are left, thereby meeting the needs of complete recycling.

[0031] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0032] In the description of the present invention, unless otherwise specified, "multiple" means two or more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A hot-melt recyclable anchor cable, characterized in that: The invention comprises a precast concrete casting base (1), an anchor cable body (7), a hot-melt metal rod (8), an end rod (9), a connecting plate (10), a heating ring (11) and a reinforcing plate (15). An anchor cable insertion hole (2) is provided inside the precast concrete casting base (1) and along the center thereof. The anchor cable body (7) is inserted into the anchor cable insertion hole (2). The insertion end of the anchor cable body (7) is fixedly connected to the hot-melt metal rod (8). The other end of the hot-melt metal rod (8) is fixedly connected to the end rod (9). The other end of the end rod (9) is welded and fixed to the connecting plate (10). The outer side of the hot-melt metal rod (8) is sleeved and fixed with a heating ring (11). The precast concrete casting base (1) is also provided with a reinforcing plate (15) for fixing the connecting plate (10).

2. A hot-melt recyclable anchor cable according to claim 1, characterized in that: An end mounting groove (3) is also provided on the end surface of the precast concrete casting base (1), the reinforcement plate (15) is located in the end mounting groove (3), and a precast concrete baffle (4) is also provided at the outer end of the end mounting groove (3).

3. A hot-melt recyclable anchor cable according to claim 1, characterized in that: Two groups of limit slots (5) are also provided on the inner wall of the anchor cable insertion hole (2) near the tensioning plate (15), and inner side sliding grooves (6) connected to the limit slots (5) are respectively provided on the upper and lower inner walls of the anchor cable insertion hole (2), and two groups of elastic steel sheets (14) are respectively welded on the upper and lower surfaces of the end rod (9), and the elastic steel sheets (14) can extend into the corresponding limit slots (5) along the corresponding inner side sliding grooves (6).

4. A hot-melt recyclable anchor cable according to claim 1, characterized in that: The heating ring (11) is also connected to a wire (13), and a protective sleeve (12) is sleeved and fixed at the connection between the wire (13) and the heating ring (11).

5. The hot-melt recyclable anchor cable according to claim 1, characterized in that: The connecting plate (10) is provided with four threaded holes one (18), the middle portion of the securing plate (15) is provided with four threaded holes two (19) corresponding to the positions of the threaded holes one (18), and the outer edge of the securing plate (15) is further provided with four threaded holes three (20).

6. A hot-melt recyclable anchor cable according to claim 5, characterized in that: A connecting screw rod (17) is inserted into the second threaded hole (19), and a limiting screw rod (16) is inserted into the third threaded hole (20).

7. A hot-melt recyclable anchor cable according to claim 3, characterized in that: A spring (21) is also fixed to the bottom of the elastic steel sheet (14), and the spring (21) is in a compressed state.

8. A construction method of a hot-melt recyclable anchor cable according to claims 1 to 5, characterized in that: The following steps are involved: Step 1: Extend the anchor cable body (7) from the end of the anchor cable insertion hole (2) to the inside thereof, and the upper and lower inner walls of the anchor cable insertion hole (2) squeeze the elastic steel sheet (14) and the spring (21). After the two are deformed, the anchor cable body (7) continues to be pushed inward until the elastic steel sheet (14) extends into the limit slot (5); Step 2: screw the limit screw (16) into the threaded hole 3 (20) in sequence, screw the connecting screw (17) into the threaded hole 2 (19) in sequence, and then erect the tensioning plate (15) and place it into the end mounting groove (3); Step 3: Continue to rotate the connecting screw (17) inwardly so that its inner end is screwed into the threaded hole 1 (18) of the connecting plate (10). Step 4: Cover the precast concrete baffle (4) on the end mounting groove (3) and seal the gap with concrete pouring; Step 5: excavate a foundation pit and bury the precast concrete casting base (1) in the foundation pit.

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