Combined device for preventing water seepage of pre-stressed anchor cable for foundation pit supporting

Abstract

The utility model discloses a combined device for preventing water seepage of a pre-stressed anchor cable for foundation pit supporting, which comprises an anchor cable, an anchor cable channel and a waist beam, the anchor cable is mounted in the anchor cable channel, the waist beam is mounted at the outer end of the anchor cable channel, a water-swelling waterstop ring is sleeved on the anchor cable, a grouting pipe is pre-buried in the waist beam, and the grouting pipe is connected with the anchor cable channel. One end of the grouting pipe extends out of the waist beam, the other end of the grouting pipe extends into the anchor cable channel, when leakage occurs, epoxy resin slurry is poured into the grouting pipe, and the epoxy resin slurry enters the anchor cable channel and swells when encountering water to form a colloidal consolidation body to block the water seepage channel. According to the utility model, a water stopping barrier can be effectively formed in the anchor cable channel, and the leaking stoppage construction operation is convenient and fast.

Description

Technical Field

[0001] The utility model relates to a prestressed anchor cable, in particular to a combined device for preventing water seepage of prestressed anchor cables used for foundation pit support. Background Art

[0002] Prestressed anchor cables are widely used in support systems such as foundation pits and slopes. They are drilled through soft rock layers or sliding surfaces, one end is fixed in hard rock layers (called inner anchor head), and then tensioned at the free end (called outer anchor head), thereby applying pressure to the rock layers to anchor unstable rock layers.

[0003] At present, during the long-term use of prestressed anchor cables, due to the diversity and complexity of geological conditions and poor construction quality, the anchor cable anchor section and free end aperture are prone to water seepage, posing a safety hazard to the foundation pit. However, after the installation of existing prestressed anchor cables, destructive operations (re-drilling, burying pipes, grouting, re-erecting scaffolding, etc.) are required to plug the leaks, which is costly and inefficient, and also destroys the integrity and stability of the support structure itself. Utility Model Content

[0004] The technical problem to be solved by the utility model is that, in view of the inconvenience of plugging leakage in the existing prestressed anchor cable structure, the utility model provides a combined device for preventing water seepage of prestressed anchor cables for foundation pit support, which can quickly eliminate anchor cable leakage.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A combined device for preventing water seepage of prestressed anchor cables used for foundation pit support, comprising an anchor cable, an anchor cable channel and a waist beam, wherein the anchor cable is installed in the anchor cable channel, the waist beam is installed at the outer end of the anchor cable channel, a water-swellable waterstop ring is sleeved on the anchor cable, a grouting pipe is pre-buried in the waist beam, one end of the grouting pipe extends out of the waist beam, and the other end extends into the anchor cable channel. When leakage occurs, epoxy resin slurry is poured into the grouting pipe, and the epoxy resin slurry enters the anchor cable channel and expands in contact with water to form a gelatinous solid body to block the water seepage channel.

[0007] The utility model can effectively prevent water seepage in the aperture of the anchoring section and the free section anchoring channel behind the support pile by adding a water-expanding water stop ring in the free section anchoring channel, and can eliminate the potential safety hazard to the foundation pit caused by anchor leakage. In addition, the utility model pre-buries a grouting pipe at the waist beam to enter the prestressed anchoring channel. When leakage occurs, epoxy resin grouting material is used to grout the anchoring channel through the pre-buried grouting pipe, which will not damage the finished product, and the plugging operation can be completed at one time, with higher construction efficiency, and can quickly eliminate anchor leakage. The construction operation is both convenient and fast, and it can effectively prevent and control slope leakage while also ensuring the safety of the slope.

[0008] Preferably, the water-swellable water-stop ring is installed at the junction of the water-stop curtain and the waist beam.

[0009] Preferably, the grouting pipe passes through the water-swellable water-stop ring, and the inner ring of the water-swellable water-stop ring is filled and sealed with waterproof mortar and steel mesh.

[0010] Preferably, the grouting pipe includes a casing, a tee and a hose, one end of the casing is inserted into the anchor cable channel, and the other end extends out of the waist beam, the tee is installed on the casing, one end of the hose extends out of the waist beam, and the other end is connected to the casing through the tee.

[0011] Preferably, the anchor cable extends out of the waist beam through the casing.

[0012] Preferably, the grouting pipe extends into the free section of the anchor cable channel.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model pre-buries a water-swellable water-stop ring and a PE grouting pipe to effectively form a water-stop barrier in the free section anchor cable channel to prevent water seepage around the junction of the anchor cable channel and the waist beam, thereby avoiding the subsequent drilling and grouting maintenance due to water seepage, which greatly increases the control surface and causes large manpower and machine costs.

[0015] 2. When the utility model is applied, if water seepage occurs, epoxy resin grouting material is used to grout the anchor cable channel through the pre-buried grouting pipe. Only conventional small-sized appliances are needed, and no drilling or grouting equipment is required. 1 to 2 people can complete the plugging construction, and the plugging process has no effect on other on-site processes and can be carried out simultaneously. The construction operation is convenient and fast, with high reliability. It can prevent and control slope leakage well while ensuring the safety of the slope, and the economic effect is obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 The utility model is a schematic diagram of the structure of a combined device for preventing water seepage of prestressed anchor cables for foundation pit support.

[0018] Figure 2 It is a sectional view of the utility model in the installation state. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0020] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] 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; 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.

[0022] See also Figure 1 , Figure 2 An embodiment of the combined device for preventing water seepage of prestressed anchor cables for foundation pit support of the utility model comprises an anchor cable 1, an anchor cable channel 2 and a waist beam 3. The anchor cable 1 is installed in the anchor cable channel 2, and the waist beam 3 is installed at the outer end of the anchor cable channel 2. A water-swellable water-stop ring 4 is mounted on the anchor cable 1 at the junction of the water-stop curtain 7 and the waist beam 3. A grouting pipe 5 is pre-buried in the waist beam 3, and one end of the grouting pipe 5 extends out of the waist beam 3, and the other end passes through the water-swellable water-stop ring 4 and extends into the free section of the anchor cable channel 2. When the prestressed anchor cable 1 seeps water, epoxy resin slurry is poured into the grouting pipe 5, and the epoxy resin slurry enters the anchor cable channel 2 through the grouting pipe 5 and expands in water to form a gel-like solid body to block the water seepage channel.

[0023] In order to prevent grouting from gushing out from the inner ring of the water-swellable water-stop ring 4, the inner ring of the water-swellable water-stop ring 4 is filled and sealed with waterproof mortar and a steel mesh 6.

[0024] In this embodiment, the grouting pipe 5 includes a sleeve 51, a tee 52 and a hose 53. One end of the sleeve 51 is inserted into the free section of the anchor cable channel 2, and the other end extends out of the waist beam 3. The tee 52 is installed on the sleeve 51. One end of the hose 53 extends out of the waist beam 3, and the other end is connected to the sleeve 51 through the tee 52. The anchor cable 1 extends out of the waist beam 3 through the sleeve 51. Grouting is injected from the hose 53 and enters the anchor cable channel 4 through the tee 52 and the sleeve 51. Obviously, the grouting pipe 5 of the utility model is not limited to the form of this embodiment, and those skilled in the art can make corresponding changes as needed.

[0025] When the utility model is used specifically, a water-swellable waterstop ring 4 with an outer ring of 200mm, an inner ring diameter of 75mm, a height of 50mm and a thickness of 20mm can be inserted into the prestressed anchor cable 1 when it is manufactured. The installation position of the water-swellable waterstop ring 4 is fixed at the junction of the water-stop curtain and the waist beam 3, and a sleeve 51 with a diameter of PVC75 is pre-buried at the waist beam 3. At 50mm where the water-swellable waterstop ring 4 and the PVC75 sleeve 51 meet, waterproof mortar and wire mesh 6 are used for filling and sealing. At the same time, a reducing tee 52 with a specification of 75mm×25mm is connected to the pre-buried sleeve 51 at the waist beam 3 in advance, and a grouting hose 53 with a diameter of 25mm is installed and buried at the small end of the tee 52. The hose 53 extends out 250mm from the concrete surface above the waist beam 3. Once the anchor cable 1 leaks, grouting is implemented from the grouting pipe mouth formed by the extended end of the pre-buried hose 53, which can effectively solve the problem of water leakage of the prestressed anchor cable.

[0026] The specific process flow of the utility model is as follows: construction preparation → production of conventional anchoring section and free section anchor cable → installation of PVC sleeve 51 of free section anchor cable → full-section grouting of anchoring section and free section anchor cable → binding of crown (waist) beam reinforcement → installation of water-expandable water-stop ring and embedded pipe → pouring and curing of crown (waist) beam concrete (28 days) → tensioning and locking of prestressed anchor cable → preparation for grouting and plugging of leakage → pouring epoxy resin into the PE grouting pipe mouth → plugging completed.

[0027] The utility model adopts a water-swellable waterstop ring with an outer ring of 200mm, an inner ring diameter of 75mm, a height of 50mm and a thickness of 20mm. It is easy to purchase and install, has a very good water-stopping effect, is pollution-free, non-toxic, harmless, corrosion-resistant, and improves construction efficiency.

[0028] When the utility model is implemented, a PVC 75 diameter sleeve 51 can be pre-buried at the crown (waist) beam in advance, and a reducing tee 52 can be connected to achieve quick assembly in advance, and then installed at the waist beam, thereby improving construction efficiency, quickly positioning, and transforming post-processing into preventive control in advance. In addition, the PVC sleeve has good tensile and compressive strength, good acid resistance, alkali resistance, corrosion resistance, long service life, and convenient material acquisition.

[0029] When the utility model is implemented, a grouting hose 53 with a buried diameter of 25 mm is installed, and the hose 53 extends out 250 mm from the concrete surface above the crown (waist) beam. When leakage occurs, epoxy resin grouting material is used to grout the anchor cable channel 2 through the pre-buried hose 53, which will not damage the finished product. The leak-proofing operation can be completed at one time, the construction efficiency is higher, and the anchor cable leakage can be quickly eliminated. The construction operation is convenient and fast, which can well prevent and control slope leakage while ensuring the safety of the slope.

[0030] The utility model adopts epoxy resin grouting material, and pre-buries a grouting pipe 5 in the free section anchor cable channel. When there is no leakage in the anchor cable, no treatment is required. If leakage occurs, epoxy resin is poured into the grouting pipe 5. The epoxy resin material expands in water to form a gel-like solid body, which does not affect the pre-force application of the free section anchor cable and can block the water seepage channel.

[0031] The utility model adopts waterproof mortar and steel wire mesh 6 to fill and seal the 50mm point where the water-expanding water stop ring is connected to the PVC75 casing 51, effectively forming a second waterproof line, preventing water penetration and improving the waterproof effect.

[0032] The utility model avoids the need to implement measures such as re-drilling, pipe burying, grouting, and re-erecting scaffolding in conventional processing processes, thereby ensuring the integrity and stability of the support structure itself to the greatest extent.

[0033] The above is only a specific implementation scheme of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the field can make many possible changes and modifications to the technical scheme of the utility model by using the technical content disclosed above without departing from the scope of the technical scheme of the utility model, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical scheme of the utility model shall fall within the protection scope of the technical scheme of the utility model.

Claims

1. A combined device for preventing water seepage of prestressed anchor cables for foundation pit support, comprising an anchor cable, an anchor cable channel and a waist beam, wherein the anchor cable is installed in the anchor cable channel, and the waist beam is installed at the outer end of the anchor cable channel, characterized in that: The anchor cable is provided with a water-swellable waterstop ring, and a grouting pipe is pre-buried in the waist beam, one end of the grouting pipe extends out of the waist beam, and the other end extends into the anchor cable channel. When leakage occurs, epoxy resin slurry is poured into the grouting pipe, and the epoxy resin slurry enters the anchor cable channel and expands when exposed to water to form a gel-like solid body to block the water seepage channel.

2. The combined device for preventing water seepage of prestressed anchor cables for foundation pit support according to claim 1 is characterized in that: The water-expandable water-stop ring is installed at the junction of the water-stop curtain and the waist beam.

3. The combined device for preventing water seepage of prestressed anchor cables for foundation pit support according to claim 1 is characterized in that: The grouting pipe passes through the water-swellable water-stop ring, and the inner ring of the water-swellable water-stop ring is filled and sealed with waterproof mortar and steel wire mesh.

4. The combined device for preventing water seepage of prestressed anchor cables for foundation pit support according to claim 1 is characterized in that: The grouting pipe includes a casing, a tee and a hose, one end of the casing is inserted into the anchor cable channel, and the other end extends out of the waist beam, the tee is installed on the casing, one end of the hose extends out of the waist beam, and the other end is connected to the casing through the tee.

5. The combined device for preventing water seepage of prestressed anchor cables for foundation pit support according to claim 4 is characterized in that: The anchor cable extends out of the waist beam through the casing.

6. The combined device for preventing water seepage of prestressed anchor cables for foundation pit support according to claim 1 is characterized in that: The grouting pipe extends into the free section of the anchor cable channel.

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