CN217460548U - Bag grouting squeezing and expanding combined anchor rod with built-in prestressed rod core - Google Patents
Bag grouting squeezing and expanding combined anchor rod with built-in prestressed rod core Download PDFInfo
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- CN217460548U CN217460548U CN202123424997.8U CN202123424997U CN217460548U CN 217460548 U CN217460548 U CN 217460548U CN 202123424997 U CN202123424997 U CN 202123424997U CN 217460548 U CN217460548 U CN 217460548U
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Abstract
The utility model discloses a bag grouting squeezing expansion combined anchor rod with a built-in prestressed rod core, aiming at providing a method which can effectively shorten the construction period; and the bag grouting squeezing expansion combined anchor rod can effectively improve the pulling resistance of the anchor rod under the condition of omitting a bottom expanding hole forming process. The device comprises a bag grouting expansion device, a precast concrete rod core and a prestressed vertical bar embedded in the precast concrete rod core, wherein the upper end of the prestressed vertical bar extends out of the upper part of the precast concrete rod core and forms a reserved rod core section above the precast concrete rod core; the bag grouting expansion device comprises a bag sleeved outside the precast concrete rod core and a bag grouting pipeline embedded in the precast concrete rod core, an extruding and expanding cavity is formed between the bag and the outer wall of the precast concrete rod core, an inlet of the bag grouting pipeline is located at the upper end of the precast concrete rod core, and an outlet of the bag grouting pipeline is communicated with the extruding and expanding cavity.
Description
Technical Field
The utility model relates to an anti technical field that floats of basement, concretely relates to crowded combination formula stock that expands of bag slip casting of built-in prestressing force pole core.
Background
With the development of urban underground space, the anti-floating problem of basements is more common. The anchor rod is widely applied as an effective measure for resisting the floating of the underground structure. The common concrete anchor rod is in a tensile state in the service period, and the common concrete anchor rod is easy to crack due to the characteristic of relatively low tensile bearing capacity of concrete. When site soil and water have corrosiveness, cracks generated in the common concrete anchor rod can cause the corrosion of the steel bars to reduce the bearing capacity of the anchor rod, and the problem of structural safety can be caused in severe cases.
In order to solve the above problems, the crack control of the concrete anchor rod is generally realized by applying a prestress to the steel bar in the concrete anchor rod. The technical standard for anti-floating of constructional engineering also has a regulation, and the anti-floating design is a class A project and a class B project, and a prestressed anchor rod is required to be used; however, the tensioning process of the existing prestressed anchor rod is generally performed after the basement bottom plate is poured, so that the anchor rod of the existing basement anti-floating structure needs to be formed by pouring in situ, the basement bottom plate is poured, and after the concrete poured by the anchor rod and the basement bottom plate is solidified, the reinforcing steel bars in the anchor rod are prestressed in the tensioning process, so that the construction period of the existing basement anti-floating structure is long, and the pore passages reserved in the basement bottom plate are easy to cause water seepage of the basement.
On the other hand, in order to improve the anti-pulling capacity of the existing concrete anchor rod, a bottom-expanding hole-forming process is generally adopted, namely, after a pile hole is formed, hole-expanding equipment is adopted to expand the bottom of the pile hole, and thus, the bottom-expanding anchor rod is formed after the anchor rod is cast and formed so as to improve the anti-pulling capacity; however, the bottom-expanding hole-forming process is complex in process and high in construction cost, and most of places are not suitable for bottom-expanding hole-forming, so that the bottom-expanding anchor rod is less in application. The bearing capacity of the common concrete anchor rod is mainly determined by the frictional resistance between the rod side and the surrounding rock-soil body, so that the pulling resistance of the common concrete anchor rod is not high. On the other hand, the anti-pulling bearing capacity of the anchor rod can be theoretically improved by utilizing the post-grouting technology, but the flow direction of slurry cannot be controlled when the technology is adopted, so that the problem of low material utilization rate exists.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a construction cycle which can be effectively shortened; and the bag grouting squeezing expansion combined anchor rod with the built-in prestressed rod core can effectively improve the pulling resistance of the anchor rod under the condition of omitting a bottom expanding hole forming process.
The technical scheme of the utility model is that:
a bag grouting squeezing expansion combined anchor rod with a built-in prestressed rod core comprises a bag grouting expansion device, a precast concrete rod core and a prestressed vertical rib embedded in the precast concrete rod core, wherein the prestressed vertical rib extends up and down along the axial direction of the precast concrete rod core, and the upper end of the prestressed vertical rib extends out of the upper part of the precast concrete rod core and forms a reserved rod core section above the precast concrete rod core; the bag grouting expansion device comprises a bag sleeved outside the precast concrete rod core and a bag grouting pipeline embedded in the precast concrete rod core, an extruding and expanding cavity is formed between the bag and the outer wall of the precast concrete rod core, an inlet of the bag grouting pipeline is located at the upper end of the precast concrete rod core, and an outlet of the bag grouting pipeline is communicated with the extruding and expanding cavity.
The bag grouting squeezing expansion combined type anchor rod with the built-in prestressed rod core is specifically used as follows, a hole is drilled at the bottom of a foundation pit to form a pile hole; then, placing the precast concrete pole core into the pile hole; then, pouring anchoring slurry into the pile hole, and filling a gap between the inner wall of the pile hole and the precast concrete rod core; then cement paste with set pressure is injected into the squeezing and expanding cavity through the bag grouting pipeline and the grouting connecting pipeline, so that the bag expands and an anchor rod expanding head is formed in the pile hole; and finally, constructing a basement bottom plate, pouring concrete at the bottom of the foundation pit to form the basement bottom plate, and burying a reserved rod core section above the precast concrete rod core in the basement bottom plate. Because the bag grouting squeezing expansion combined anchor rod with the built-in prestressed rod core is internally provided with the prestressed vertical ribs (adopting the prestress technology), the problem that concrete of a common anchor rod is easy to crack can be effectively solved. Meanwhile, the precast concrete pole core is precast in a factory, and the reserved pole core section above the precast concrete pole core is buried in the basement bottom plate, so that the process of prestress tension is not needed to be carried out after the basement is poured in site construction, the construction period is greatly shortened, and the problem that the basement using the prestress vertical rib in the prior art has the hidden danger of water leakage can be effectively solved. More importantly, cement paste with set pressure can be injected into the squeezing and expanding cavity through the bag grouting pipeline and the grouting connecting pipeline, so that the bag expands and an anchor rod expanding head is formed in the pile hole, the mutual extrusion effect between the anchor rod and the rock and soil mass around the pile hole is effectively enhanced under the condition that a bottom expanding and hole forming process is omitted, and the anti-pulling performance of the anchor rod is effectively improved; and the construction process is simple and the construction cost is low.
Preferably, the upper end and the lower end of the bag are hermetically connected with the outer wall of the precast concrete rod core.
Preferably, the upper end and the lower end of the bag are respectively and tightly held on the outer wall of the precast concrete pole core through steel hoops, so that the upper end and the lower end of the bag are hermetically connected with the outer wall of the precast concrete pole core. Therefore, the method is convenient for actual processing and manufacturing.
Preferably, the number of the bags is multiple, the multiple bags are sequentially distributed from top to bottom, the extrusion cavities correspond to the bags one by one, each bag grouting pipeline comprises a main grouting pipeline and a grouting connecting pipeline corresponding to the extrusion cavities one by one, the upper end of the main grouting pipeline is communicated with the upper end face of the precast concrete rod core, the upper end port of the main grouting pipeline forms an inlet of the bag grouting pipeline, the grouting connecting pipeline is connected with the main grouting pipeline and the corresponding extrusion cavities, and one end port of the grouting connecting pipeline communicated with the corresponding extrusion cavities forms an outlet of the bag grouting pipeline. So, can form a plurality of stock enlarged footing, the mutual squeezing action between further reinforcing stock and the ground body around the stake hole to promote the resistance to plucking performance of stock.
As preferred, prefabricated formula prestressed anchorage pole is still including setting up the downthehole slip casting standpipe on the precast concrete pole core, and downthehole slip casting standpipe lower extreme is close to precast concrete pole core lower extreme, and downthehole slip casting standpipe lower extreme position is higher than precast concrete pole core lower extreme position. Therefore, the anchoring slurry can be poured into the pile hole through the grouting vertical pipe in the hole, and the actual construction is facilitated.
Preferably, the grouting vertical pipe in the hole is bound and fixed on the outer wall of the precast concrete rod core.
As another preferred, downthehole slip casting standpipe sets up in the precast concrete pole core, and the lower extreme of downthehole slip casting standpipe communicates with precast concrete pole core lateral wall bottom.
Preferably, the reserved core section is in an inverted L shape. So, be favorable to improving the combination steadiness of reserving core of rod section and basement bottom plate.
Preferably, a plurality of anchor pile bulges are further arranged on the side wall of the precast concrete core. Therefore, the bonding performance between the precast concrete rod core and the anchoring slurry can be enhanced through the anchor pile protrusion.
Preferably, the prestressed vertical bars are prestressed steel bars or prestressed twisted steel wires.
The utility model has the advantages that: not only can effectively shorten the construction period; and the uplift resistance of the anchor rod can be effectively improved under the condition of omitting a bottom expanding and hole forming process.
Drawings
Fig. 1 is a schematic view of a local structure of a basement anti-floating structure of a bag grouting squeezing expansion combined anchor rod with a built-in prestressed rod core before bag grouting.
Fig. 2 is a schematic cross-sectional view taken along line a-a in fig. 1.
Fig. 3 is a schematic view of a local structure of the anti-floating structure of the basement of the bag grouting squeezing combined anchor rod with the built-in prestressed rod core in the bag grouting process.
In the figure:
1.1 of a precast concrete pole core, 1.2 of a prestressed vertical rib, 1.3 of a reserved pole core section, 1.4 of a bag, 1.5 of a steel hoop, 1.6 of a bag grouting pipeline, 1.61 of a main grouting pipeline, 1.62 of a grouting connecting pipeline, 1.7 of an anchor pile bulge, 1.8 of a grouting vertical pipe in a hole and 1.9 of a squeezing cavity;
anchoring slurry 3;
a basement floor 4.
Detailed Description
To make the objects, technical solutions and advantages of embodiments of the present invention clearer, the embodiments of the present invention are clearly explained and illustrated below with reference to the accompanying drawings, but the following embodiments are only preferred embodiments of the present invention, not all embodiments. Based on the embodiments in the embodiment, other embodiments obtained by those skilled in the art without any creative work belong to the protection scope of the present invention.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present solution, and are not construed as limiting the present solution.
These and other aspects of embodiments of the invention will be apparent with reference to the following description and attached drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the ways in which the principles of the embodiments of the invention may be employed, but it is understood that the scope of the embodiments of the invention is not limited thereby. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
In the description of the present invention, it is to be understood that the terms "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and simplification of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., and "a plurality" means one or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The first embodiment is as follows: as shown in fig. 1, 2 and 3, the bag grouting squeezing expansion combined anchor rod with the built-in prestressed rod core comprises a bag grouting expansion device, a precast concrete rod core 1.1 and a prestressed vertical rib 1.2 embedded in the precast concrete rod core. The vertical prestressed reinforcement extends up and down along the axial direction of the precast concrete pole core. The upper end of the vertical prestressed reinforcement extends above the precast concrete core and forms a reserved core section 1.3 above the precast concrete core. The bag grouting expansion device comprises a bag 1.4 sleeved outside the precast concrete rod core and a bag grouting pipeline 1.6 embedded in the precast concrete rod core. An extruding and expanding cavity 1.9 is formed between the bag and the outer wall of the precast concrete rod core. The inlet of the bag grouting pipeline is positioned at the upper end of the precast concrete rod core, and the outlet of the bag grouting pipeline is communicated with the squeezing and expanding cavity.
In this embodiment, the vertical prestressed reinforcement is one or more, and the vertical prestressed reinforcement is a prestressed reinforcement or a prestressed twisted wire. The precast concrete pole core is a factory precast product, wherein the bag can be assembled in a factory; the bag also can be assembled at the foundation pit construction site, and specifically, the bag is sleeved on the precast concrete pole core at the foundation pit construction site, and the upper end and the lower end of the bag are respectively clasped on the outer wall of the precast concrete pole core through steel hoops, so that the upper end and the lower end of the bag are hermetically connected with the outer wall of the precast concrete pole core.
The bag grouting squeezing expansion combined anchor rod with the built-in prestressed rod core is specifically used as follows, a hole is drilled at the bottom of a foundation pit to form a pile hole 2; then, placing the precast concrete pole core into the pile hole; then, pouring anchoring slurry 3 into the pile hole, and filling a gap between the inner wall of the pile hole and the precast concrete rod core, wherein the anchoring slurry is concrete slurry; then, bag grouting is carried out, namely cement paste with set pressure is injected into the squeezing and expanding cavity through a bag grouting pipeline and a grouting connecting pipeline, so that the bag expands and an anchor rod expanding head is formed in the pile hole; and finally, constructing a basement bottom plate 4, pouring concrete at the bottom of the foundation pit to form the basement bottom plate, and burying a reserved rod core section above the precast concrete rod core in the basement bottom plate. Because the bag grouting squeezing expansion combined anchor rod with the built-in prestressed rod core is internally provided with the prestressed vertical ribs (adopting the prestress technology), the problem that concrete of a common anchor rod is easy to crack can be effectively solved. Meanwhile, the precast concrete pole core is precast in a factory, and the reserved pole core section above the precast concrete pole core is buried in the basement bottom plate, so that the process of prestress tension is not needed to be carried out after the basement is poured in site construction, the construction period is greatly shortened, and the problem that the basement using the prestress vertical rib in the prior art has the hidden danger of water leakage can be effectively solved. More importantly, cement paste with set pressure can be injected into the squeezing and expanding cavity through the bag grouting pipeline and the grouting connecting pipeline, so that the bag expands and an anchor rod expanding head is formed in the pile hole, the mutual extrusion effect between the anchor rod and the rock and soil mass around the pile hole is effectively enhanced under the condition that a bottom expanding and hole forming process is omitted, and the anti-pulling performance of the anchor rod is effectively improved; and the construction process is simple and the construction cost is low.
Further, as shown in fig. 1, the upper and lower ends of the bladder are hermetically connected to the outer wall of the precast concrete pole core. The upper end and the lower end of the bag are respectively tightly held on the outer wall of the precast concrete pole core through steel hoops 1.5, so that the upper end and the lower end of the bag are hermetically connected with the outer wall of the precast concrete pole core. Therefore, the method is convenient for actual processing and manufacturing.
Further, as shown in fig. 1 and 3, the number of the pockets is plural, and the plural pockets are distributed from top to bottom in sequence. The extruding and expanding cavities correspond to the bags one by one. The bag grouting pipeline comprises a main grouting pipeline 1.61 and grouting connecting pipelines 1.62 corresponding to the squeezing and expanding cavities one by one. The upper end of the main grouting pipeline is communicated with the upper end face of the precast concrete pole core. The upper port of the main grouting pipeline forms the inlet of the bag grouting pipeline. The grouting connecting pipeline is connected with the main grouting pipeline and the corresponding squeezing and expanding cavity, and one port communicated with the corresponding squeezing and expanding cavity on the grouting connecting pipeline forms an outlet of the bag grouting pipeline. So, can form a plurality of stock enlarged footing, the mutual squeezing action between further reinforcing stock and the ground body around the stake hole to promote the resistance to plucking performance of stock.
Further, as shown in fig. 2, prefabricated formula prestressed anchorage pole is still including setting up downthehole slip casting standpipe 1.8 on the precast concrete pole core, and downthehole slip casting standpipe lower extreme is close to precast concrete pole core lower extreme, and downthehole slip casting standpipe lower extreme position is higher than precast concrete pole core lower extreme position. Therefore, the anchoring slurry can be poured into the pile hole through the grouting vertical pipe in the hole, and the actual construction is facilitated.
In an implementation mode of this embodiment, downthehole slip casting standpipe ligature is fixed on precast concrete pole core outer wall.
In another implementation manner of this embodiment, the in-hole grouting standpipe is embedded in the precast concrete core, and the lower end of the in-hole grouting standpipe is communicated with the bottom of the side wall of the precast concrete core.
Further, as shown in fig. 1, the reserved core segment 1.3 is in an inverted L shape. So, be favorable to improving the combination steadiness of reserving core of rod section and basement bottom plate.
Further, as shown in fig. 1 and 2, an anchor pile protrusion 1.7 is arranged on the side wall of the precast concrete pole core. Therefore, the bonding performance between the precast concrete rod core and the anchoring slurry can be enhanced through the anchor pile protrusion.
The above, only be the preferred embodiment of the utility model, it is not right the utility model discloses do any restriction, all according to the utility model discloses any simple modification, change and equivalent transformation that the technical essence was done to above embodiment all still belong to the technical scheme's of the utility model protection scope.
Claims (10)
1. A bag grouting squeezing expansion combined anchor rod with a built-in prestressed rod core is characterized by comprising a bag grouting expansion device, a precast concrete rod core (1.1) and a prestressed vertical rib (1.2) embedded in the precast concrete rod core (1.1), wherein the prestressed vertical rib (1.2) extends up and down along the axial direction of the precast concrete rod core (1.1), the upper end of the prestressed vertical rib (1.2) extends out of the upper part of the precast concrete rod core (1.1) and a reserved rod core section (1.3) is formed above the precast concrete rod core (1.1); the bag grouting expansion device comprises a bag (1.4) sleeved outside the precast concrete rod core (1.1) and a bag grouting pipeline (1.6) embedded in the precast concrete rod core (1.1), an extruding and expanding cavity (1.9) is formed between the bag (1.4) and the outer wall of the precast concrete rod core (1.1), the inlet of the bag grouting pipeline (1.6) is located at the upper end of the precast concrete rod core (1.1), and the outlet of the bag grouting pipeline (1.6) is communicated with the extruding and expanding cavity (1.9).
2. The grouting squeeze-expanding combined anchor rod with the built-in prestressed rod core of claim 1, characterized in that the upper and lower ends of the bladder (1.4) are hermetically connected with the outer wall of the precast concrete rod core (1.1).
3. The grouting, squeezing and expanding combined anchor rod with the bag internally provided with the prestressed rod core as claimed in claim 2, wherein the upper and lower ends of the bag (1.4) are respectively clasped on the outer wall of the precast concrete rod core (1.1) through steel hoops, so that the upper and lower ends of the bag (1.4) are hermetically connected with the outer wall of the precast concrete rod core (1.1).
4. The combined anchor rod of claim 1 or 2 or 3, which is filled with a bag with a built-in prestressed rod core, the prefabricated concrete pole core grouting bag is characterized in that the number of the bag bags (1.4) is multiple, the bag bags (1.4) are sequentially distributed from top to bottom, the extrusion-expansion cavities (1.9) correspond to the bag bags (1.4) one by one, the bag grouting pipeline (1.6) comprises a main grouting pipeline (1.61) and grouting connecting pipelines (1.62) corresponding to the extrusion-expansion cavities (1.9) one by one, the upper end of the main grouting pipeline (1.61) is communicated with the upper end face of the prefabricated concrete pole core (1.1), the upper end opening of the main grouting pipeline (1.61) forms an inlet of the bag grouting pipeline (1.6), the grouting connecting pipeline (1.62) is connected with the main grouting pipeline (1.61) and the corresponding squeezing and expanding cavity (1.9), and one port of the grouting connecting pipeline (1.62) communicated with the corresponding squeezing and expanding cavity (1.9) forms an outlet of the grouting bag pipeline (1.6).
5. The bag grouting squeeze-expansion combined anchor rod with the built-in prestressed rod core as claimed in claim 1, 2 or 3, wherein the prefabricated prestressed anchor rod further comprises an in-hole grouting standpipe (1.8) arranged on the prefabricated concrete rod core (1.1), the lower end of the in-hole grouting standpipe (1.8) is close to the lower end of the prefabricated concrete rod core (1.1), and the lower end of the in-hole grouting standpipe (1.8) is higher than the lower end of the prefabricated concrete rod core (1.1).
6. The combined type anchor rod of the grouting squeezing expansion of the bag with the built-in prestressed rod core of claim 5 is characterized in that the grouting vertical pipe (1.8) in the hole is bound and fixed on the outer wall of the precast concrete rod core (1.1).
7. The grouting squeeze-expanding combined anchor rod with the built-in prestressed rod core according to claim 5, characterized in that the in-hole grouting standpipe (1.8) is arranged in the precast concrete rod core (1.1), and the lower end of the in-hole grouting standpipe (1.8) is communicated with the bottom of the side wall of the precast concrete rod core (1.1).
8. The combined anchor rod of claim 1, 2 or 3, wherein the pre-stressed core section (1.3) is in an inverted L shape.
9. The combined anchor rod of claim 1, 2 or 3, wherein the side wall of the precast concrete core (1.1) is further provided with a plurality of anchor pile protrusions (1.7).
10. The grouting and squeezing combined anchor rod of the capsular bag with the built-in prestressed rod core as claimed in claim 1, 2 or 3, wherein the prestressed vertical ribs (1.2) are prestressed steel ribs or prestressed twisted steel wires.
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| CN202123424997.8U CN217460548U (en) | 2021-12-28 | 2021-12-28 | Bag grouting squeezing and expanding combined anchor rod with built-in prestressed rod core |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114525781A (en) * | 2021-12-28 | 2022-05-24 | 浙江省建筑设计研究院 | Prestressed rod core bag grouting combined anti-floating component and construction method |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114525781A (en) * | 2021-12-28 | 2022-05-24 | 浙江省建筑设计研究院 | Prestressed rod core bag grouting combined anti-floating component and construction method |
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