Segmented anchoring hot casting anchor inhaul cable and anchor grouting method

Abstract

The invention relates to a segmented anchoring hot casting anchor inhaul cable and an anchor grouting method, and belongs to the technical field of hot casting anchor inhaul cables for bridges and building structures. Comprising an anchor cup and a conical alloy casting body, and the conical alloy casting body is anchored to a steel wire bundle at the end of the inhaul cable and arranged in the anchor cup; the conical alloy casting body comprises a first casting body and a second casting body, the second casting body is arranged above the first casting body, the first casting body is arranged at the small end of the inner cavity of the anchor cup, and the second casting body is arranged at the large end of the inner cavity of the anchor cup. And the length of the first casting body is 1 / 4-1 / 3 of the length of the inner cavity of the anchor cup. Differentiated alloy anchoring materials are poured in the inhaul cable anchor cup in a segmented mode, the static load anchoring performance of the inhaul cable is ensured, and the anti-fatigue performance of the inhaul cable at the small end of the anchor cup is improved.

Description

Technical Field

[0001] The present invention relates to a hot-cast anchor cable with segmented anchoring and a grouting and anchoring method, belonging to the technical field of hot-cast anchor cables for bridge and building structures. Background Art

[0002] For parallel wire cables used as load-bearing cables in long-span bridges, hot-cast anchors or cold-cast anchors are generally used to anchor high-strength steel wires. In a hot-cast anchor, molten zinc-based alloy is poured into an anchor cup, and after the alloy solidifies, a tightly combined alloy anchor body is formed with the high-strength steel wires, thereby achieving effective anchoring of the high-strength steel wires.

[0003] In the existing hot-cast anchor technology for cable stays, the conventional method is to pour a single type of alloy throughout the entire length of the anchor cup, such as zinc-copper alloy (zinc content 98%, copper content 2%) or zinc-aluminum-copper alloy (zinc content 93%, aluminum content 6%, copper content 1%). However, there are the following deficiencies: 1) During the pouring process, the alloy liquid is poured into the large end of the anchor cup. Due to its long flow path, it is easy to cause insufficient pouring of the alloy at the small end of the anchor cup, affecting the anchoring effect; 2) The alloy used has a relatively high hardness, resulting in poor anti-fatigue performance of the cable stay wires at the small end of the tapered cavity of the anchor cup, affecting the overall anti-fatigue effect of the cable stay. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a hot-cast anchor cable with segmented anchoring and a grouting and anchoring method for the above-mentioned existing technology. By pouring different alloy anchoring materials in segments in the anchor cup of the cable stay, both the static load anchoring performance of the cable stay is ensured, and the anti-fatigue performance of the cable stay at the small end of the anchor cup is improved.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows: A hot-cast anchor cable with segmented anchoring includes an anchor cup and a tapered alloy casting. The tapered alloy casting is anchored on the steel wire bundle at the end of the cable stay, and the tapered alloy casting is arranged in the anchor cup; the tapered alloy casting includes a first casting body and a second casting body. The second casting body is arranged above the first casting body. The first casting body is arranged at the small end of the inner cavity of the anchor cup, and the second casting body is arranged at the large end of the inner cavity of the anchor cup.

[0006] The length of the first casting body is 1 / 4 to 1 / 3 of the length of the inner cavity of the anchor cup.

[0007] A grouting and anchoring method for a hot-cast anchor cable with segmented anchoring, the grouting and anchoring method includes the following steps: Step 1: Prepare a first molten alloy liquid and a second molten alloy liquid respectively, and keep them warm for standby; Step 2: Pass the cable stay wire bundle through the inner cavity of the anchor cup until the wire bundle at the end of the cable stay exposes a certain length outside the anchor cup, and then pass the wire bundle at the end of the cable stay through a wire dividing plate, so that the wire bundle at the end of the cable stay is divided and diverged at intervals, and the divergence length matches the length of the inner cavity of the anchor cup; Step 3: Manufacture a casting anchor that matches the inner cavity size of the anchor cup; The casting anchor includes a mold body and a side gating body. The inner cavity of the mold body is divided into a first casting cavity and a second casting cavity arranged vertically, and the first casting cavity is located below the second casting cavity; a communication port is opened on the side of the small end of the mold body, and the communication port is connected to the side gating body. A side gate is provided at the top of the side gating body; the inner cavity of the side gating body serves as a side gating channel, and the side gate, the side gating channel and the first casting cavity are connected and communicated; Step 4: Install the casting anchor at the end of the cable after wire splitting and divergence treatment, and a leak-proof member is provided between the inner hole of the small end of the mold body and the outer diameter of the cable; Step 5: Assemble and fix the casting anchor and the cable end for erection treatment so that the large end of the casting anchor is arranged vertically upward; Step 6: Preheat the assembled and fixed casting anchor and the cable end, and the preheating temperature is 100°C to 290°C; Step 7: Pour the first molten alloy liquid into the side gating body through the side gate and then flow into the first casting cavity. When the liquid level of the first molten alloy liquid reaches the specified position, stop pouring to form the first casting; Step 8: Pour the second molten alloy liquid into the second casting cavity from the large end of the mold body until the liquid level of the second molten alloy liquid reaches the specified position, and then stop pouring to form the second casting; Step 9: After cooling, remove the casting anchor and clean the solidified residue formed in the side gating channel to obtain a conical alloy casting composed of the first casting and the second casting; Step 10: Socket and assemble the anchor cup pre-installed on the cable with the conical alloy casting to form a combined body; Step 11: Place the combined body on the workbench, fix the anchor cup, use a jacking device to jack the large end of the conical alloy casting or use a tensioning device to connect the anchor cups at both ends of the cable to pre-tension the cable, and measure and record the displacement value of the conical alloy casting.

[0008] The inner cavity size of the casting anchor is 0.5% to 5% larger than the inner cavity size of the anchor cup, and the wall thickness of the mold body is 10 to 30 mm.

[0009] The casting anchor is composed of two casting split parts arranged symmetrically left and right. Positioning holes and a plurality of connection holes are respectively opened on the casting split parts. The two casting split parts are opposed and a positioning pin is inserted into the positioning holes so that the two casting split parts are accurately assembled; after assembly, bolts are inserted into the connection holes to realize the fixed connection of the two casting split parts; the parting surface of the casting anchor is located on the longitudinal axis of the cable.

[0010] The temperature of the first molten alloy liquid and the second molten alloy liquid is 30 to 80°C higher than the liquidus temperature.

[0011] The first molten alloy liquid uses a low-melting-point zinc-based alloy.

[0012] The second molten alloy liquid uses a zinc-copper alloy, a zinc-copper-aluminum alloy, or a zinc-copper-titanium alloy.

[0013] During the pouring in Step 7, observe the liquid level height of the side gate, and control the liquid level height of the first casting cavity according to the principle of equal height of the communicating vessels.

[0014] The jacking load of the jacking equipment or the tensioning load of the tensioning equipment in Step 10 is not less than 45% of the nominal breaking force of the cable.

[0015] Compared with the prior art, the advantages of the present invention are as follows: A segmented-anchoring hot-cast anchor cable and a grouting and anchoring method. Differentiated first and second casting bodies are segmented and arranged in the anchor cup. On the basis of ensuring the static load anchoring performance of the cable, the anti-fatigue performance of the cable at the small end of the anchor cup is effectively improved, thereby significantly enhancing the overall performance and service life of the cable. By means of the casting anchor, segmented casting of the alloy anchoring casting body is realized. According to the principle of equal height of the communicating vessels, precise control of the casting length of different alloy anchoring casting bodies can be achieved, avoiding the problem of insufficient casting due to the long flow path of the alloy liquid, and improving the long-term creep resistance and fatigue resistance of the anchoring casting body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a segmented-anchoring hot-cast anchor cable according to an embodiment of the present invention; Figure 2 is a sectional view of the casting anchor; Figure 3 is a top view of the casting anchor; Figure 4 is an assembly schematic diagram of the casting anchor and the wire bundle at the end of the cable; Figure 5 is a casting schematic diagram of the first casting body; Figure 6 is a casting schematic diagram of the second casting body; Figure 7 is a schematic diagram of the conical alloy casting body after casting is completed, cooled, and the surplus material in the side casting channel is cleaned up; In the figure, 1 is the anchor cup, 2 is the second casting body, 3 is the first casting body, 4 is the wire bundle, 5 is the wire dividing plate, 6 is the casting anchor, 61 is the mold body, 62 is the side casting body, 63 is the communication port, and 7 is the leak-proof clamping plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present invention will be further described in detail below with reference to the embodiments in the drawings.

[0018] As Figure 1As shown in the figure, a hot-cast anchor cable with segmented anchorage in this embodiment includes an anchor cup 1 and a conical alloy casting. The inner cavity of the anchor cup is conical. The conical alloy casting is anchored on the steel wire bundle 4 at the end of the cable, and the conical alloy casting is arranged in the inner cavity of the anchor cup 1. The conical alloy casting includes a first casting 3 and a second casting 2. The second casting 2 is arranged above the first casting 3. The first casting 3 is arranged at the small end of the inner cavity of the anchor cup 1, and the second casting 2 is arranged at the large end of the inner cavity of the anchor cup 1.

[0019] The length of the first casting 3 is 1 / 4 to 1 / 3 of the length of the inner cavity of the anchor cup 1.

[0020] A method for grouting an anchor cable with segmented anchorage by hot casting includes the following steps: Step 1: Prepare the first molten alloy liquid and the second molten alloy liquid respectively and keep them warm for use. The temperature of the first molten alloy liquid and the second molten alloy liquid is 30 to 80 °C higher than the liquidus temperature. The first molten alloy liquid uses low-melting-point zinc-based alloys such as pure zinc or zinc-tin. The second molten alloy liquid uses zinc-copper alloy, zinc-copper-aluminum alloy or zinc-copper-titanium alloy.

[0021] Step 2: Pass the cable steel wire bundle 4 through the inner cavity of the anchor cup until the steel wire bundle at the end of the cable exposes a certain length outside the anchor cup. Then pass the steel wire bundle at the end of the cable through the wire dividing plate 5 so that the steel wire bundle at the end of the cable is divided and diverged at a certain interval, and the divergence length matches the length of the inner cavity of the anchor cup.

[0022] Step 3: Make a casting mold 6 that matches the inner cavity size of the anchor cup 1.

[0023] As Figure 2 、 3 shown, the casting mold 6 includes a mold body 61 and a side casting body 62. The inner cavity of the mold body 61 is divided into a first casting cavity and a second casting cavity arranged up and down. The first casting cavity is arranged below the second casting cavity. A communication port 63 is opened on the side of the small end of the mold body 61. The communication port 63 is connected to the side casting body 62, and a side casting port is arranged at the top of the side casting body 62. The inner cavity of the side casting body 62 serves as a side casting channel, and the side casting port, the side casting channel and the first casting cavity are connected and communicated.

[0024] The casting mold is composed of two casting split parts arranged symmetrically left and right. Positioning holes and a plurality of connection holes are respectively opened on the casting split parts. The two casting split parts are combined relatively, and positioning pins are inserted into the positioning holes so that the two casting split parts are accurately assembled. After assembly, bolts are inserted into the connection holes to realize the fixed connection of the two casting split parts, which is convenient for installation and disassembly. The parting surface of the casting mold is located on the longitudinal axis of the cable. The wall thickness of the mold body is 10 to 30 mm.

[0025] Step 4: Install the casting mold 6 at the end of the cable that has been divided and diverged. A leak-proof piece is arranged between the inner hole of the small end of the mold body and the outer diameter of the cable.

[0026] The leak stoppage member is a leak stoppage clamping plate 7 or a leak stoppage filling material.

[0027] As Figure 4 shown, Step Five: Assemble and fix the casting anchor and the end of the cable stay for erection treatment, so that the large end of the casting anchor (i.e., the large end of the casting anchor) is arranged vertically upward.

[0028] Step Six: Preheat the assembled and fixed casting anchor and the end of the cable stay, and the preheating temperature is 100°C to 290°C.

[0029] As Figure 5 shown, Step Seven: Pour the first molten alloy liquid into the side casting body through the side gate and then flow into the first casting cavity. During pouring, observe the liquid level height of the side gate, control the liquid level height of the first molten alloy liquid in the first casting cavity according to the principle of equal height of the communicating vessels. When the liquid level height of the side gate reaches the specified position, stop pouring to form the first casting body 3.

[0030] As Figure 6 shown, Step Eight: Pour the second molten alloy liquid from the large end of the mold body into the second casting cavity until the liquid level of the second molten alloy liquid reaches the specified position, and then stop pouring to form the second casting body 2.

[0031] As Figure 7 shown, Step Nine: After cooling, remove the casting anchor and clean the solidified residue formed in the side casting channel to obtain a conical alloy casting composed of the first casting body and the second casting body.

[0032] Step Ten: Socket and assemble the anchor cup pre-installed on the cable stay with the conical alloy casting to form an assembly.

[0033] Step Eleven: Place the assembly on the workbench, fix the anchor cup, use a jacking device to jack the large end of the conical alloy casting or use a tensioning device to connect the anchor cups at both ends of the cable stay to pre-tension the cable stay, and measure and record the displacement value of the conical alloy casting.

[0034] The inner cavity size of the casting anchor is 0.5% to 5% larger than the inner cavity size of the anchor cup, so that the conical alloy casting is tightly connected to the inner cavity of the anchor cup. The jacking load of the jacking device or the tensioning load of the tensioning device in Step Ten is not less than 45% of the nominal breaking force of the cable stay.

[0035] In this application, the first casting body and the second casting body with differences are arranged in sections in the anchor cup. On the basis of ensuring the static load anchoring performance of the cable stay, the anti-fatigue performance of the cable stay at the small end of the anchor cup is effectively improved, thereby significantly enhancing the overall performance and service life of the cable stay. By using the casting anchor to achieve segmented casting of the alloy anchoring casting, through the principle of equal height of the communicating vessels, the accurate control of the casting length of different alloy anchoring castings can be realized, avoiding the problem of insufficient casting due to the long flow path of the alloy liquid, and improving the long-term creep resistance and fatigue resistance of the anchoring casting.

[0036] In addition to the above embodiments, the present invention also includes other embodiments. Any technical solutions formed by equivalent transformation or equivalent substitution shall fall within the protection scope of the claims of the present invention.

Claims

1. A segmentally anchored hot-cast anchor cable, characterized in that: It includes an anchor cup and a conical alloy casting body. The conical alloy casting body is anchored on the steel wire bundle at the end of the cable, and the conical alloy casting body is arranged inside the anchor cup. The conical alloy casting body includes a first casting body and a second casting body. The second casting body is arranged above the first casting body. The first casting body is arranged at the small end of the inner cavity of the anchor cup, and the second casting body is arranged at the large end of the inner cavity of the anchor cup.

2. The hot-cast anchor cable with segmented anchoring according to claim 1, characterized in that: The length of the first casting body is 1 / 4 to 1 / 3 of the length of the inner cavity of the anchor cup.

3. The grouting and anchoring method for the hot-cast anchor cable with segmented anchoring according to any one of claims 1-2, characterized in that: The grouting and anchoring method includes the following steps: Step 1: Prepare the first molten alloy liquid and the second molten alloy liquid respectively and keep them warm for standby. Step 2: Pass the cable steel wire bundle through the inner cavity of the anchor cup until a certain length of the steel wire bundle at the end of the cable exposes out of the anchor cup. Then pass the steel wire bundle at the end of the cable through the wire dividing plate so that the steel wire bundle at the end of the cable is divided and diverged at intervals, and the divergence length matches the length of the inner cavity of the anchor cup. Step 3: Make a casting anchor tool that matches the size of the inner cavity of the anchor cup. The casting anchor tool includes a mold body and a side casting body. The inner cavity of the mold body is divided into a first casting cavity and a second casting cavity arranged up and down. The first casting cavity is arranged below the second casting cavity. A communication port is opened on the side of the small end of the mold body. The communication port is connected to the side casting body, and a side casting port is arranged at the top of the side casting body. The inner cavity of the side casting body serves as a side casting channel, and the side casting port, the side casting channel and the first casting cavity are connected and communicated. Step 4: Install the casting anchor tool at the end of the cable that has been divided and diverged. A leak-proof part is arranged between the inner hole of the small end of the mold body and the outer diameter of the cable. Step 5: Assemble and fix the casting anchor tool and the end of the cable for vertical treatment so that the large end of the casting anchor tool is arranged vertically upward. Step 6: Carry out preheating treatment on the assembled and fixed casting anchor tool and the end of the cable. The preheating temperature is 100°C to 290°C. Step 7: Pour the first molten alloy liquid into the side casting body through the side casting port and then flow into the first casting cavity. When the liquid level of the first molten alloy liquid reaches the specified position, stop pouring to form the first casting body. Step 8: Pour the second molten alloy liquid into the second casting cavity from the large end of the mold body until the liquid level of the second molten alloy liquid reaches the specified position, and then stop pouring to form the second casting body. Step 9: After cooling, remove the casting anchor tool and clean the solidified residue formed in the side casting channel to obtain a conical alloy casting body composed of the first casting body and the second casting body. Step 10: Socket and fit the anchor cup pre-installed on the cable with the conical alloy casting body to form a combined body. Step 11: Place the combined body on the workbench, fix the anchor cup, and use a jacking device to jack the large end of the conical alloy casting body or use a tensioning device to connect the anchor cups at both ends of the cable to pre-tension the cable, and measure and record the displacement value of the conical alloy casting body.

4. The grouting method of a hot-cast anchor cable with segmented anchoring according to claim 3, characterized in that: The inner cavity size of the casting anchor tool is 0.5 to 5% larger than the inner cavity size of the anchor cup, and the wall thickness of the mold body is 10 to 30 mm.

5. The grouting method of a thermo-cast anchor cable with segmented anchoring according to claim 3, characterized in that: The casting anchor is composed of two casting split parts arranged symmetrically on the left and right. Positioning holes and a plurality of connecting holes are respectively formed in the casting split parts. The two casting split parts are opposed and a positioning pin is inserted into the positioning hole, so that the two casting split parts are accurately assembled. After assembly, bolts are respectively inserted into the connecting holes to realize the fixed connection of the two casting split parts. The parting surface of the casting anchor is located on the longitudinal axis of the cable.

6. The grouting method of a thermo-cast anchor cable with segmented anchorage according to claim 3, characterized in that: The temperatures of the first molten alloy liquid and the second molten alloy liquid are 30 - 80 °C higher than the liquidus temperature.

7. The grouting method of a hot-cast anchor cable with segmented anchoring according to claim 3, characterized in that: The first molten alloy liquid is a low-melting-point zinc-based alloy.

8. The grouting method of a hot-cast anchor cable with segmented anchorage according to claim 3, characterized in that: The second molten alloy liquid is a zinc-copper alloy, a zinc-copper-aluminum alloy or a zinc-copper-titanium alloy.

9. The grouting method of a thermo-cast anchor cable with segmented anchoring according to claim 3, characterized in that: In step seven, when pouring, observe the liquid level height of the side gate, and control the liquid level height of the first casting cavity according to the principle of equal height of the communicating vessel.

10. A grouting method for a hot-cast anchor cable with segmented anchoring according to claim 3, characterized in that: The jacking load of the jacking equipment or the tensioning load of the tensioning equipment in step ten is not less than 45% of the nominal breaking force of the cable.

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