Waterproof structure and construction method of the connection between prestressed anti-floating anchor rod and waterproof plate

Abstract

The invention discloses a waterproof structure and construction method at the connection between a prestressed anti-floating anchor rod and a waterproof board, and belongs to the field of anti-floating anchor rods. The waterproof structure at the connection between the prestressed anti-floating anchor rod and the waterproof board comprises a concrete prefabricated part, a prestressed anchor cable, a metal hose, a waterproof board, an anchor rod cement slurry consolidation body and an anchor rod grouting consolidation body, the concrete prefabricated part comprises a connected cone and a cylinder, the cylinder extends into the anchor hole, the prestressed anchor cable passes through the concrete prefabricated part and extends into the anchor hole, the metal hose is sleeved on the prestressed anchor cable, a grouting pipe is arranged on the metal hose, the waterproof board connects the cone and the metal hose, the prestressed anchor cable and the grouting pipe are exposed from above the waterproof board, the anchor rod cement slurry consolidation body is located between the metal hose and the inner wall of the anchor hole, the anchor rod cement slurry consolidation body is connected to the cylinder, the anchor rod grouting consolidation body is located between the prestressed anchor cable and the metal hose, and the alkali-activated concrete consolidation body is located in the cone. The invention can effectively avoid water seepage at the connection between the anti-floating anchor rod and the waterproof board.

Description

Technical Field

[0001] The invention relates to the technical field of anti-floating anchor rods, and in particular to a waterproof structure and a construction method for a connection between a prestressed anti-floating anchor rod and a waterproof plate. Background Art

[0002] The construction sequence of prestressed anchor rods is: drilling anchor rod holes → grouting → waterproofing construction → pouring waterproof board → prestressed anchor cable tensioning and anchoring → grouting in transition steel cylinder → pouring anchor pit concrete. Often, the cement slurry consolidation body of the prestressed anchor rod needs to penetrate the waterproof board, but the construction sequence of anchor rod drilling and grouting is before pouring the waterproof board concrete. Therefore, the grouting is stopped after the anchor rod grouting height reaches the top of the cushion layer. The grouting operation can only be carried out after the waterproof board concrete pouring is completed and the prestressed anchor cable tensioning and anchoring is completed before penetrating the waterproof board. In order to prevent concrete from leaking into the anchor holes during the pouring of waterproof board concrete, a transition steel cylinder is usually used to block it. Groundwater can easily penetrate into the waterproof board along the outer side of the transition steel cylinder inside the waterproof board and reach the board surface through the micro-cracks of the waterproof board. After the prestressed anchor cable is tensioned, the anchor and anchor pad block the transition steel cylinder hole, making it difficult to inject slurry into the transition steel cylinder, resulting in loose grouting in the transition steel cylinder. Groundwater can easily penetrate into the waterproof board from the cushion layer along the inner wall of the transition steel cylinder. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a waterproof structure and construction method for the connection between a prestressed anti-floating anchor rod and a waterproof plate, which solves the problem in the prior art that groundwater easily penetrates into the waterproof plate along the inner and outer walls of the transition steel cylinder.

[0004] The waterproof structure at the connection between the prestressed anti-floating anchor rod and the waterproof plate according to an embodiment of the present invention comprises:

[0005] The prefabricated concrete part comprises a connected cone and a cylinder, wherein the outer diameter of one end of the cone close to the cylinder is smaller than the other end, and the cylinder extends into the anchor hole;

[0006] A prestressed anchor cable, one end of which passes through the precast concrete component and extends into the anchor hole;

[0007] A metal hose is sleeved on the prestressed anchor cable, a grouting pipe is provided on the metal hose, the grouting pipe is communicated with the inside of the metal hose, and a grouting port is provided at one end of the grouting pipe away from the metal hose;

[0008] A waterproof plate, connecting the precast concrete part and the metal hose, the prestressed anchor cable is exposed from above the waterproof plate, and the grouting port is exposed from above the waterproof plate;

[0009] An anchor rod cement slurry consolidation body, located between the metal hose and the inner wall of the anchor hole, the anchor rod cement slurry consolidation body is connected to the cylinder;

[0010] Anchor rod grouting consolidation body, located between the prestressed anchor cable and the metal hose;

[0011] The alkali-activated concrete consolidation body is arranged in the cone.

[0012] The waterproof structure at the connection between the prestressed anti-floating anchor rod and the waterproof plate according to the embodiment of the present invention has at least the following beneficial effects:

[0013] By eliminating the transition steel cylinder, the anchor cement slurry consolidation body no longer penetrates the waterproof board, and only the prestressed anchor cable wrapped in the metal hose penetrates the waterproof board, which can effectively prevent the concrete from leaking into the transition steel cylinder when pouring the waterproof board concrete when the transition steel cylinder is not tightly connected to the cushion layer, affecting the subsequent grouting. After the prestressed anchor cable is tensioned, grouting can be added into the metal hose along the grouting port, which improves the problem that after tensioning, the anchor and anchor pad block the transition steel cylinder, making it difficult to inject slurry into the transition steel cylinder, resulting in loose grouting and groundwater seeping from the cushion layer along the inner wall of the transition steel cylinder into the waterproof board.

[0014] The precast concrete parts connect the anchor cement slurry consolidation body and the waterproof plate, forming the anchor cement slurry consolidation body and the waterproof plate into a whole, so as to effectively transmit the force on the waterproof plate to the anchor cement slurry consolidation body.

[0015] Injecting alkali-activated concrete into precast concrete parts to form an alkali-activated concrete consolidation body can improve the concentration of cement slurry diluted by groundwater during the first grouting process, which results in the height of the cement slurry consolidation body being lower than the top of the cushion layer after the cement slurry settles, causing the anchor cement slurry consolidation body to be incomplete and prestressed anchor cables in some areas lacking cement slurry consolidation body wrapping.

[0016] Use metal hose instead of PVC corrugated casing to wrap prestressed anchor cable. Metal hose has strong corrosion resistance and can reduce the corrosion of anchor cable by groundwater. Metal hose has stronger rigidity than PVC corrugated casing and can improve the problem that the reserved length of prestressed anchor cable drives the anchor cable to fall under the action of its own weight, and then drives the metal hose to deviate and fall to the wall of the anchor hole, causing the thickness of the cement slurry protective layer to not meet the design requirements.

[0017] The metal hose is connected to a grouting pipe, and cement slurry is injected into the metal hose through the grouting port to form an anchor grouting consolidation body. The semi-adhesive prestressed anchor can be changed into a fully-adhesive prestressed anchor. The anchor cable is wrapped with cement mortar, which can effectively form the prestressed anchor cable and the cement slurry consolidation body into a whole, preventing the anchor from failing and being unable to generate tension.

[0018] According to some embodiments of the present invention, a plurality of first steel bars are protruding from one end of the conical cylinder away from the cylinder, and a plurality of second steel bars are protruding from one end of the cylinder away from the conical cylinder.

[0019] According to some embodiments of the present invention, the surface of the metal hose is uneven.

[0020] According to some embodiments of the present invention, a waterproof membrane is further included, and the waterproof membrane is disposed around the precast concrete component.

[0021] According to some embodiments of the present invention, a waterproof component is provided at the connection between the waterproof membrane and the precast concrete component.

[0022] The construction method of the waterproof structure at the connection between the prestressed anti-floating anchor rod and the waterproof plate according to the embodiment of the present invention comprises the following steps:

[0023] S1: Drill anchor holes at preset locations.

[0024] S2: Put the prestressed anchor cable onto the metal hose and insert it into the anchor hole.

[0025] S3: The metal hose passes through the precast concrete part and the cylinder extends into the anchor hole.

[0026] S4: Grouting is performed into the anchor hole to form an anchor cement slurry consolidation body.

[0027] S5: After the anchor cement slurry consolidation body solidifies, alkali-activated concrete is injected into the cone to form an alkali-activated concrete consolidation body.

[0028] S6: Lay waterproof membrane around precast concrete components.

[0029] S7: Binding of reinforcement bars and pouring of concrete for waterproof slabs.

[0030] S8: Prestressed anchor cable tensioning anchorage.

[0031] S9: Cement slurry is injected into the metal hose along the grouting port to form an anchor grouting consolidation body.

[0032] The construction method of the waterproof structure at the connection between the prestressed anti-floating anchor rod and the waterproof plate according to the embodiment of the present invention has at least the following beneficial effects:

[0033] By eliminating the transition steel cylinder, the anchor cement slurry consolidation body no longer penetrates the waterproof board, and only the prestressed anchor cable wrapped in the metal hose penetrates the waterproof board, which can effectively prevent the concrete from leaking into the transition steel cylinder when pouring the waterproof board concrete when the transition steel cylinder is not tightly connected to the cushion layer, affecting the subsequent grouting. After the prestressed anchor cable is tensioned, grouting can be added into the metal hose along the grouting port, which improves the problem that after tensioning, the anchor and anchor pad block the transition steel cylinder, making it difficult to inject slurry into the transition steel cylinder, resulting in loose grouting and groundwater seeping from the cushion layer along the inner wall of the transition steel cylinder into the waterproof board.

[0034] The precast concrete parts connect the anchor cement slurry consolidation body and the waterproof board, forming the anchor cement slurry consolidation body and the waterproof board into a whole, so as to effectively transmit the force on the waterproof board to the anchor cement slurry consolidation body. Waterproof membranes are laid around the precast concrete parts to reduce the penetration of groundwater into the waterproof board.

[0035] Injecting alkali-activated concrete into precast concrete parts to form an alkali-activated concrete consolidation body can improve the concentration of cement slurry diluted by groundwater during the first grouting process, which results in the height of the cement slurry consolidation body being lower than the top of the cushion layer after the cement slurry settles, causing the anchor cement slurry consolidation body to be incomplete and prestressed anchor cables in some areas lacking cement slurry consolidation body wrapping.

[0036] Use metal hose instead of PVC corrugated casing to wrap prestressed anchor cable. Metal hose has strong corrosion resistance and can reduce the corrosion of anchor cable by groundwater. Metal hose has stronger rigidity than PVC corrugated casing and can improve the problem that the reserved length of prestressed anchor cable drives the anchor cable to fall under the action of its own weight, and then drives the metal hose to deviate and fall to the wall of the anchor hole, causing the thickness of the cement slurry protective layer to not meet the design requirements.

[0037] The metal hose is connected to a grouting pipe, and cement slurry is injected into the metal hose through the grouting port to form an anchor grouting consolidation body. The semi-adhesive prestressed anchor can be changed into a fully-adhesive prestressed anchor. The anchor cable is wrapped with cement mortar, which can effectively form the prestressed anchor cable and the cement slurry consolidation body into a whole, preventing the anchor from failing and being unable to generate tension.

[0038] According to some embodiments of the present invention, step S4 comprises the following steps:

[0039] S41: The first grouting is stopped until pure cement slurry overflows from the top of the cushion layer.

[0040] S42: The second grouting is carried out about 1 hour after the first grouting is completed, and the grouting is stopped after the pure cement slurry overflows from the top of the cushion layer. The grouting pressure of the first grouting is less than that of the second grouting.

[0041] According to some embodiments of the present invention, in step S41, the grouting pressure of the first grouting is less than 1 MPa.

[0042] In step S42, the grouting pressure of the second grouting is 1-3Mpa.

[0043] According to some embodiments of the present invention, step S6 further includes the following steps:

[0044] S61: Apply waterproofing material between waterproof membrane and precast concrete parts.

[0045] According to some embodiments of the present invention, step S6 further includes the following steps:

[0046] S62: Applying penetrating crystals on precast concrete parts.

[0047] According to some embodiments of the present invention, in step S2, after the prestressed anchor cable is covered with the metal hose, the end of the metal hose and the prestressed anchor cable are sealed using a seal, and then the end with the seal is extended into the anchor hole.

[0048] According to some embodiments of the present invention, before step S4, the grouting opening is sealed with a filler;

[0049] Before step S9, the filler at the grouting opening is taken out.

[0050] Additional aspects and advantages of the invention will be set forth in part in the description which follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0052] Figure 1 It is a schematic structural diagram of a waterproof structure at the connection between a prestressed anti-floating anchor rod and a waterproof plate according to an embodiment of the present invention;

[0053] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0054] Figure 3 A schematic structural diagram of a prefabricated concrete member of a waterproof structure at a connection between a prestressed anti-floating anchor rod and a waterproof plate according to an embodiment of the present invention;

[0055] Figure 4 It is a flow chart of a construction method of a waterproof structure at a connection between a prestressed anti-floating anchor rod and a waterproof plate according to an embodiment of the present invention;

[0056] Figure 5 It is a schematic diagram of the structure of the anti-floating anchor rod in the prior art.

[0057] Figure Number:

[0058] 100. cushion layer;

[0059] 200, prefabricated concrete part; 210, cone; 211, first steel bar; 220, cylinder; 221, second steel bar; 230, alkali-activated concrete consolidation body;

[0060] 300, waterproof membrane; 310, waterproof parts;

[0061] 400, prestressed anchor cable; 410, corrugated pipe;

[0062] 500, metal hose; 510, grouting pipe; 511, grouting port; 520, anchor grouting consolidation body;

[0063] 600, water-resistant board;

[0064] 700, anchor; 710, anchor pad;

[0065] 800, anchor hole; 810, anchor cement slurry consolidation body;

[0066] 900, transition steel cylinder; 910, waterstop steel plate. DETAILED DESCRIPTION

[0067] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0068] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0069] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] See also Figure 5 The construction process of anti-floating anchor rods in the prior art is generally too complicated. The connection node between the prestressed anchor rod and the waterproof plate is a relatively weak link in the waterproof system, and leakage occurs at the connection joint and the expected design effect cannot be achieved.

[0071] The causes of leakage are as follows:

[0072] 1. Because the groundwater level is high, a large amount of groundwater accumulates in the hole after the anchor hole is drilled. The groundwater will dilute the concentration of cement slurry, resulting in the cement slurry solidification body height being lower than the top of the cushion layer 100 after the cement slurry is precipitated, causing the prestressed anchor cable in the area near the top of the cushion layer 100 to lack cement wrapping, and the anchor cement slurry solidification body is incomplete.

[0073] 2. Since the transition steel cylinder 900 is difficult to be tightly connected with the cushion layer 100, the concrete is easy to leak into the transition steel cylinder 900 when pouring the waterproof board concrete, which affects the subsequent prestressed anchor cable tensioning and grouting operations in the transition steel cylinder 900.

[0074] 3. The PVC corrugated pipe 410 has no rigidity. The length of the prestressed anchor cable extending out of the ground is usually about 1.5 to 2.5 meters. It is easy to fall outside under the deadweight of the anchor cable, causing the PVC corrugated pipe 410 sheath to deviate and fall toward the hole wall. The thickness of the cement slurry protective layer is not easy to meet the design requirements. Under this condition, it is difficult to ensure the durability and pull-out bearing capacity of the prestressed anti-floating anchor rod.

[0075] 4. Groundwater can easily penetrate into the waterproof board 600 along the outer side of the transition steel cylinder 900 inside the waterproof board 600 and reach the board surface through the micro cracks of the waterproof board 600. The water-stop steel plate 910 in the middle of the transition steel cylinder 900 can hardly play an effective role.

[0076] 5. After the prestressed anchor cable 400 is tensioned, the anchor 700 and the anchor pad 710 block the hole of the transition steel cylinder 900, making it difficult to inject slurry into the transition steel cylinder 900, resulting in loose slurry in the transition steel cylinder 900, and groundwater easily penetrates from the cushion layer 100 along the inner wall of the transition steel cylinder 900 into the waterproof plate 600.

[0077] See also Figure 1 , Figure 2 and Figure 3 During construction, a cushion layer 100 is laid on the foundation, and then an anchor hole 800 is drilled, and the anchor hole 800 passes through the cushion layer 100 .

[0078] The waterproof structure at the connection between the prestressed anti-floating anchor rod and the waterproof board of the embodiment of the present invention comprises a prefabricated concrete part 200, a prestressed anchor cable 400, a metal hose 500, a waterproof board 600, an anchor rod cement slurry consolidation body 810, an anchor rod grouting consolidation body 520 and an alkali-activated concrete consolidation body 230. The prefabricated concrete part 200 comprises a connected cone 210 and a cylinder 220, the outer diameter of one end of the cone 210 close to the cylinder 220 is smaller than the other end, and the cylinder 220 extends into the anchor hole 800. One end of the prestressed anchor cable 400 passes through the prefabricated concrete part 200 and extends into the anchor hole 800, and the metal hose 500 is sleeved on the prestressed anchor cable 400. A grouting pipe 510 is provided on the metal hose 500, and the grouting pipe 510 is communicated with the inside of the metal hose 500, and a grouting port 511 is provided at one end of the grouting pipe 510 away from the metal hose 500. The waterproof plate 600 connects the cone 210 and the metal hose 500, the prestressed anchor cable 400 is exposed from above the waterproof plate 600, and the grouting port 511 is exposed from above the waterproof plate 600. The anchor rod cement slurry consolidation body 810 is located between the metal hose 500 and the inner wall of the anchor hole 800, and the anchor rod cement slurry consolidation body 810 is connected to the cylinder 220. The anchor rod grouting consolidation body 520 is located between the prestressed anchor cable 400 and the metal hose 500.

[0079] By eliminating the transition steel cylinder 900, the anchor cement slurry consolidation body 810 no longer penetrates the waterproof board 600, and only the prestressed anchor cable 400 wrapped by the metal hose 500 penetrates the waterproof board 600, which can effectively prevent the concrete from leaking into the transition steel cylinder 900 when pouring the waterproof board 600 concrete when the transition steel cylinder 900 is not tightly connected to the cushion layer 100, affecting the subsequent grouting. After the prestressed anchor cable 400 is tensioned, grouting can be performed along the grouting port 511 into the metal hose 500, which improves the problem that after tensioning, the anchor 700 and the anchor pad 710 block the transition steel cylinder 900, making it difficult to inject slurry into the transition steel cylinder 900, resulting in loose grouting and groundwater seeping into the waterproof board 600 along the inner wall of the transition steel cylinder 900 from the cushion layer 100.

[0080] The prefabricated concrete part 200 connects the anchor cement slurry consolidation body 810 and the waterproof plate 600 to form the anchor cement slurry consolidation body 810 and the waterproof plate 600 into a whole, so as to effectively transmit the force exerted on the waterproof plate 600 to the anchor cement slurry consolidation body 810 .

[0081] Injecting alkali-activated concrete into the precast concrete part 200 to form an alkali-activated concrete consolidation body 230 can improve the concentration of cement slurry diluted by groundwater during the first grouting process, resulting in the height of the anchor cement slurry consolidation body 810 being lower than the top of the cushion layer 100 after the cement slurry is precipitated, causing the anchor cement slurry consolidation body 810 to be incomplete and the prestressed anchor cable 400 in some areas to lack the wrapping of the anchor cement slurry consolidation body 810.

[0082] A metal hose 500 is used instead of the PVC corrugated tube 410 to wrap the prestressed anchor cable 400. The metal hose 500 has a strong corrosion resistance and can reduce the corrosion of the prestressed anchor cable 400 by groundwater. Compared with the PVC corrugated tube 410, the metal hose 500 has a stronger rigidity and can improve the problem that the reserved length of the prestressed anchor cable 400 drives the prestressed anchor cable 400 to fall under the action of its own weight, and then drives the metal hose 500 to deviate and fall toward the wall of the anchor hole 800, resulting in the thickness of the cement slurry protective layer not meeting the design requirements.

[0083] A grouting pipe 510 is connected to the metal hose 500, and cement slurry is injected into the metal hose 500 through the grouting port 511 to form an anchor grouting consolidation body 520. The semi-adhesive prestressed anchor can be changed into a fully-adhesive prestressed anchor. The anchor cable is wrapped with cement mortar, which can effectively form the prestressed anchor cable 400 and the anchor cement slurry consolidation body 810 into a whole, thereby preventing the anchor 700 from failing and being unable to generate tension.

[0084] In some embodiments, see Figure 1 , Figure 2 and Figure 3 The prefabricated concrete part 200 includes a connected cone 210 and a cylinder 220, one end of the cylinder 220 extends into the anchor hole 800, the cone 210 is connected to the waterproof board 600, and the outer diameter of one end of the cone 210 close to the cylinder 220 is smaller than the other end. The cylinder 220 is more convenient to insert into the anchor hole 800, and the cone 210 is provided, and the outer diameter of the upper end of the cone 210 is larger, so that the connection between the prefabricated concrete part 200 and the waterproof board 600 can be more tightly.

[0085] In some embodiments, see Figure 1 , Figure 2 and Figure 3 A plurality of first steel bars 211 are protruding from one end of the cone 210 away from the cylinder 220, and a plurality of second steel bars 221 are protruding from one end of the cylinder 220 away from the cone 210. The first steel bars 211 are connected to the waterproof plate 600, and the second steel bars 221 are connected to the anchor cement slurry consolidation body 810, so that the anchor cement slurry consolidation body and the waterproof plate 600 are formed into a whole, so as to effectively transmit the force on the waterproof plate 600 to the anchor cement slurry consolidation body.

[0086] In some embodiments, see Figure 1 and Figure 2, the surface of the metal hose 500 is uneven. The metal hose 500 includes a bellows and a mesh sleeve. The bellows is the main part of the metal hose 500, and it has a spiral or annular corrugated structure. This structure allows the bellows to stretch or shorten under axial tension or pressure, and can withstand a certain degree of bending deformation. The bellows is usually made of seamless or longitudinally welded thin-walled tubes through mechanical rolling or hydraulic bulging. The mesh sleeve is woven from intersecting metal wires or metal strips in a certain order, and it is usually installed on the outer surface of the metal bellows. The main function of the mesh sleeve is to strengthen the pressure-bearing capacity of the bellows and protect the bellows from damage from the external environment.

[0087] The metal hose can be a stainless steel vacuum hose, which has good rigidity and corrosion resistance. The uneven surface of the metal hose 500 can increase the contact area between the metal hose 500 and the waterproof plate 600, so that the metal hose 500 and the waterproof plate 600 are tightly connected, which can effectively prevent groundwater from easily penetrating into the waterproof plate 600 along the outer side of the stainless steel vacuum hose in the waterproof plate 600.

[0088] In some embodiments, see Figure 1 , Figure 2 and Figure 3 The waterproofing coiled material 300 is arranged on the cushion layer 100 , and the waterproofing coiled material 300 is arranged around the precast concrete part 200 . The waterproofing coiled material 300 is laid around the precast concrete part 200 to reduce the penetration of groundwater into the waterproof board 600 .

[0089] In some embodiments, see Figure 1 , Figure 2 and Figure 3 A waterproof member 310 is provided at the connection between the waterproof coiled material 300 and the precast concrete member 200. The waterproof member 310 may be grease or asphalt. The waterproof member 310 can make the waterproof coiled material 300 and the precast concrete member 200 fit closely and reduce water seepage.

[0090] See also Figure 1 , Figure 2 and Figure 4 According to an embodiment of the present invention, a construction method for a waterproof structure at a connection between a prestressed anti-floating anchor rod and a waterproof plate comprises the following steps:

[0091] S1: Drill anchor holes 800 at the preset position. According to the control points and the anchor plan layout, measure and place the anchors, and mark the anchor hole 800. After determining the anchor hole position, use a high-pressure anchor drill to drill the hole. When the drill is in place, it must be firmly fixed to ensure the horizontality of the drill frame and the verticality of the vertical axis. After drilling, high-pressure air can be used to remove the residual residue in the hole to avoid the presence of sediment in the hole. At the same time, the on-site engineer and quality inspector will test the hole depth and the deflection of the anchor hole 800, and proceed to the next process after meeting the requirements.

[0092] S2: After the prestressed anchor cable 400 is put on the metal hose 500, it is inserted into the anchor hole 800. First, a grouting pipe 510 is welded on the metal hose 500, and the non-anchoring section of the prestressed anchor cable 400 (prestressed steel strand) is inserted into the metal hose 500. At the end of the metal hose 500, a seal (epoxy hot melt adhesive, which is quickly cured by heating) is used to tightly seal the tail end of the metal hose 500 with the prestressed anchor cable 400 to prevent cement slurry from entering during the grouting process, and the rod body is slowly fed into the hole along the center line of the drill hole.

[0093] S3: The metal hose 500 passes through the precast concrete part 200, and the cylinder 220 extends into the anchor hole 800. The grouting port 511 is filled with a filler, which may be cotton or a rubber plug, to prevent cement slurry from penetrating into the metal hose 500 when the waterproof board 600 is poured with concrete, thereby affecting the tensioning of the prestressed anchor cable 400.

[0094] S4: Grouting is performed into the anchor hole 800 to form an anchor cement slurry consolidation body 810. The grouting is performed in two steps. The first grouting is performed until pure cement slurry overflows from the top of the cushion layer 100 and then the grouting is stopped. The second pressure grouting is performed about 1 hour after the first grouting is completed and the grouting is stopped until pure cement slurry overflows from the top of the cushion layer 100 and then the grouting is stopped. The grouting pressure of the first grouting is less than that of the second grouting. The grouting pressure of the first grouting is less than 1Mpa, and the grouting pressure of the second grouting is 1-3Mpa. The first grouting can fill the gap between the metal hose 500 and the anchor hole 800. The second grouting, with a grouting pressure greater than the first grouting, can fill the gap after the first grouting through high pressure, diffuse and penetrate around, reinforce the rock and soil around the borehole, and improve the strength of the anchor cement slurry consolidation body 810.

[0095] S5: After the anchor cement slurry solidification body 810 solidifies, alkali-activated concrete is injected into the prefabricated concrete part 200 to form an alkali-activated concrete solidification body 230. Ensure that the alkali-activated concrete in the prefabricated concrete part 200 is filled and dense. The alkali-activated concrete has the characteristics of being relatively viscous and having a short setting time. There will be no slurry leakage during the injection process, which can effectively shorten the construction period.

[0096] S6: Lay the waterproofing membrane 300 around the precast concrete part 200. It also includes step S61: Apply the waterproofing member 310 between the waterproofing membrane 300 and the precast concrete part 200. The waterproofing member 310 can make the waterproofing membrane 300 and the precast concrete part 200 fit tightly and reduce water seepage. It also includes step S62: Apply a film of penetrating crystallization on the precast concrete part 200. First, use a steel brush to clean the cement slurry and dust on the surface of the first steel bar 211 of the precast concrete part 200, and then apply 1mm thick penetrating crystallization on the surface of the precast concrete part 200 and the first steel bar 211 to enhance the waterproof effect of the concrete.

[0097] S7: 600 steel bar binding, concrete pouring and maintenance of waterproof board.

[0098] S8: tensioning and anchoring the prestressed anchor cable 400. The prestressed anchor cable 400 is tensioned by a cyclic loading and unloading method, and is anchored by an anchor 700. The anchor 700 is abutted against an anchor pad 710 below, and the anchor pad 710 abuts against the waterproof plate 600.

[0099] S9: Take out the filler at the grouting opening 511, and inject cement slurry into the metal hose 500 along the grouting opening 511 to form the anchor grouting consolidation body 520. The semi-adhesive prestressed anchor is changed to a fully-adhesive prestressed anchor, and the prestressed anchor cable 400 is wrapped with cement mortar, which can effectively form the prestressed anchor cable 400 and the cement slurry consolidation body into a whole, preventing the anchor 700 from failing and failing to generate tension.

[0100] By eliminating the transition steel cylinder 900, the anchor cement slurry consolidation body 810 no longer penetrates the waterproof board 600, and only the prestressed anchor cable 400 wrapped by the metal hose 500 penetrates the waterproof board 600, which can effectively prevent the concrete from leaking into the transition steel cylinder 900 when pouring the waterproof board 600 concrete when the transition steel cylinder 900 is not tightly connected to the cushion layer 100, affecting the subsequent grouting. After the prestressed anchor cable 400 is tensioned, grouting can be performed along the grouting port 511 into the metal hose 500, which improves the problem that after tensioning, the anchor 700 and the anchor pad 710 block the transition steel cylinder 900, making it difficult to inject slurry into the transition steel cylinder 900, resulting in loose grouting and groundwater seeping into the waterproof board 600 along the inner wall of the transition steel cylinder 900 from the cushion layer 100.

[0101] The precast concrete part 200 connects the anchor cement slurry consolidation body and the waterproof board 600, forming the anchor cement slurry consolidation body and the waterproof board 600 into a whole, so as to effectively transmit the force on the waterproof board 600 to the anchor cement slurry consolidation body 810. The waterproofing membrane 300 is laid around the precast concrete part 200 to reduce the penetration of groundwater into the waterproof board 600.

[0102] Injecting alkali-activated concrete into the precast concrete part 200 to form an alkali-activated concrete consolidation body 230 can improve the concentration of cement slurry diluted by groundwater during the first grouting process, resulting in the height of the cement slurry consolidation body being lower than the top of the cushion layer 100 after the cement slurry is precipitated, causing the anchor cement slurry consolidation body 810 to be an incomplete anchor and the prestressed anchor cable 400 in some areas to lack the cement slurry consolidation body wrapping.

[0103] A metal hose 500 is used instead of the PVC corrugated tube 410 to wrap the prestressed anchor cable 400. The metal hose 500 has a strong corrosion resistance and can reduce the corrosion of the anchor cable by groundwater. Compared with the PVC corrugated tube 410, the metal hose 500 has a stronger rigidity and can improve the problem that the reserved length of the prestressed anchor cable 400 drives the anchor cable to fall under the action of its own weight, and then drives the metal hose 500 to deviate and fall toward the wall of the anchor hole 800, resulting in the thickness of the cement slurry protective layer not meeting the design requirements.

[0104] A grouting pipe 510 is connected to the metal hose 500. Cement slurry is injected into the metal hose 500 through the grouting port 511. The semi-adhesive prestressed anchor rod can be changed into a fully-adhesive prestressed anchor rod. The anchor cable is wrapped with cement mortar, which can effectively form the prestressed anchor cable 400 and the cement slurry solidification body into a whole, preventing the anchor 700 from failing and being unable to generate tension.

[0105] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0106] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A waterproof structure at the connection between a prestressed anti-floating anchor rod and a waterproof plate, characterized in that: include: The prefabricated concrete part comprises a connected cone and a cylinder, wherein the outer diameter of one end of the cone close to the cylinder is smaller than the other end, and the cylinder extends into the anchor hole; A prestressed anchor cable, one end of which passes through the precast concrete component and extends into the anchor hole; A metal hose is sleeved on the prestressed anchor cable, a grouting pipe is arranged on the metal hose, the grouting pipe is connected to the inside of the metal hose, and a grouting port is arranged at one end of the grouting pipe away from the metal hose, the grouting port is used to inject cement slurry into the metal hose to form an anchor grouting consolidation body, and a semi-adhesive prestressed anchor can be changed into a fully-adhesive prestressed anchor; A waterproof plate is connected to the cone and the metal hose, the prestressed anchor cable is exposed from above the waterproof plate, the grouting port is exposed from above the waterproof plate, and the cone is connected inside the waterproof plate; An anchor cement slurry consolidation body, located between the metal hose and the inner wall of the anchor hole, the anchor cement slurry consolidation body is connected to the cylinder; Anchor rod grouting consolidation body, located between the prestressed anchor cable and the metal hose; The alkali-activated concrete consolidation body is located in the cone and is used to improve the concentration of the cement slurry diluted by groundwater during the first grouting process, so that the anchor cement slurry consolidation body is complete.

2. The waterproof structure at the connection between the prestressed anti-floating anchor rod and the waterproof plate according to claim 1 is characterized in that: A plurality of first steel bars are protruding from one end of the conical cylinder away from the cylinder, and a plurality of second steel bars are protruding from one end of the cylinder away from the conical cylinder.

3. The waterproof structure at the connection between the prestressed anti-floating anchor rod and the waterproof plate according to claim 1 is characterized in that: The surface of the metal hose is uneven.

4. The waterproof structure at the connection between the prestressed anti-floating anchor rod and the waterproof plate according to claim 1 is characterized in that: It also includes a waterproof membrane, which is arranged around the precast concrete part.

5. The waterproof structure at the connection between the prestressed anti-floating anchor rod and the waterproof plate according to claim 4 is characterized in that: A waterproof part is arranged at the connection between the waterproof coiled material and the prefabricated concrete part.

6. A method for constructing a waterproof structure at the connection between a prestressed anti-floating anchor rod and a waterproof board as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Drill anchor holes at preset locations; S2: After putting the prestressed anchor cable on the metal hose, extend it into the anchor hole; S3: The metal hose passes through the precast concrete part and the cylinder extends into the anchor hole; S4: injecting grout into the anchor hole to form an anchor cement slurry consolidation body; S5: After the anchor cement slurry solidified body is solidified, alkali activated concrete is injected into the cone to form an alkali activated concrete solidified body; S6: Lay waterproof membrane around precast concrete components; S7: Tie up reinforcement bars and pour concrete for waterproof slabs; S8: prestressed anchor cable tensioning anchorage; S9: Cement slurry is injected into the metal hose along the grouting port to form an anchor grouting consolidation body.

7. The construction method of the waterproof structure at the connection between the prestressed anti-floating anchor rod and the waterproof plate according to claim 6 is characterized in that: The step S6 further comprises the following steps: S61: Apply waterproofing coating to the joints between waterproof membrane and precast concrete parts.

8. The construction method of the waterproof structure at the connection between the prestressed anti-floating anchor rod and the waterproof plate according to claim 6 is characterized in that: The step S6 further comprises the following steps: S62: Applying penetrating crystals on precast concrete parts.

9. The construction method of the waterproof structure at the connection between the prestressed anti-floating anchor rod and the waterproof plate according to claim 6, characterized in that: In the step S2, after the prestressed anchor cable is covered with the metal hose, the end of the metal hose and the prestressed anchor cable are sealed using a seal, and then the end with the seal is inserted into the anchor hole.

10. The construction method of the waterproof structure at the connection between the prestressed anti-floating anchor rod and the waterproof board according to claim 6, characterized in that: Before step S4, the grouting opening is sealed with a filler; Before step S9, the filler at the grouting opening is taken out.

Images