CN114525781A - Prestressed rod core bag grouting combined anti-floating component and construction method - Google Patents
Prestressed rod core bag grouting combined anti-floating component and construction method Download PDFInfo
- Publication number
- CN114525781A CN114525781A CN202111625008.3A CN202111625008A CN114525781A CN 114525781 A CN114525781 A CN 114525781A CN 202111625008 A CN202111625008 A CN 202111625008A CN 114525781 A CN114525781 A CN 114525781A
- Authority
- CN
- China
- Prior art keywords
- prefabricated
- grouting
- pile
- prestressed
- bag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/54—Piles with prefabricated supports or anchoring parts; Anchoring piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
- E02D31/12—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against upward hydraulic pressure
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/727—Offshore wind turbines
Abstract
The invention discloses a prestressed rod core bag grouting combined anti-floating component and a construction method, aiming at providing a prestressed rod core bag grouting combined anti-floating component which can effectively shorten the construction period and effectively solve the problem of water leakage hidden trouble of a basement when a prestressed rod core in the prior art is used; and the grouting combined anti-floating component of the prestressed rod core bag and the construction method can effectively improve the pulling resistance of the anchor rod under the condition of omitting a bottom expanding and hole forming process. The construction method of the anti-floating component combined by grouting of the prestressed rod core bag comprises the following steps of firstly, constructing a pile hole; secondly, mounting the prefabricated prestressed anchor rod, and placing the prefabricated prestressed anchor rod into the pile hole; thirdly, grouting a pile hole, namely grouting anchoring slurry in the pile hole, and filling a gap between the inner wall of the pile hole and the prefabricated prestressed anchor rod; fourthly, forming an anchor rod expanding head in the pile hole; and fifthly, constructing the basement bottom plate, and pouring concrete at the bottom of the foundation pit to form the basement bottom plate.
Description
Technical Field
The invention relates to the technical field of basement anti-floating, in particular to a prestressed rod core bag grouting combined anti-floating component and a construction method.
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 during service, and cracks are easily generated on the common concrete anchor rod due to the characteristic that the tensile bearing capacity of concrete is relatively low. 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.
Disclosure of Invention
The invention aims to provide a prestressed rod core which can effectively shorten the construction period and effectively solve the problem of hidden water leakage danger of a basement when the prestressed rod core in the prior art is used; and the grouting combined anti-floating component of the prestressed rod core bag and the construction method can effectively improve the pulling resistance of the anchor rod under the condition of omitting a bottom expanding and hole forming process.
The technical scheme of the invention is as follows:
a construction method of a prestressed rod core bag grouting combined anti-floating component comprises the following steps,
firstly, constructing a pile hole, namely drilling a hole at the bottom of a foundation pit to form the pile hole;
secondly, the prefabricated prestressed anchor rod is installed, the prefabricated prestressed anchor rod is placed into the pile hole, the prefabricated prestressed anchor rod comprises a squeezing and expanding device, a prefabricated anchor pile and a vertical prestressed steel bar embedded in the prefabricated anchor pile, and the upper end of the vertical prestressed steel bar extends out of the prefabricated anchor pile and forms a reserved steel bar above the prefabricated anchor pile; the squeezing and expanding device comprises a bag sleeved outside the prefabricated anchor pile, a grouting cavity formed between the bag and the outer wall of the prefabricated anchor pile and a grouting channel arranged in the prefabricated anchor pile and communicated with the grouting cavity, wherein the upper end of the grouting channel is communicated with the upper end of the prefabricated anchor pile;
thirdly, grouting a pile hole, namely grouting anchoring slurry in the pile hole, and filling a gap between the inner wall of the pile hole and the prefabricated prestressed anchor rod;
fourthly, cement paste with set pressure is injected into the grouting cavity through the grouting channel and the connecting channel, so that the bag expands and an anchor rod expanding head is formed in the pile hole;
and fifthly, constructing the basement bottom plate, pouring concrete at the bottom of the foundation pit to form the basement bottom plate, and burying the reserved steel bars above the prefabricated anchor piles in the basement bottom plate.
The construction method of the basement anti-floating structure adopts the prefabricated prestressed anchor rods, vertical prestressed reinforcements are arranged in the prefabricated prestressed anchor rods (the prestressed technology is adopted), and the problem that concrete of a common anchor rod is prone to cracking can be effectively solved. Meanwhile, the prefabricated prestressed anchor rods are prefabricated in a factory, and the reserved steel bars above the prefabricated anchor piles are buried in the bottom plate of the basement, so that the process of prestress tensioning after the basement is poured is not needed in site construction, the construction period is greatly shortened, and the problem that the basement using the prestressed anchor rod core in the prior art has the hidden danger of water leakage is effectively solved. More importantly, cement paste with set pressure can be injected into the grouting cavity through the grouting channel and the connecting channel, so that the bag expands and an anchor rod expanded head is formed in the pile hole, and therefore, under the condition that a bottom expanding and hole forming process is omitted, the mutual extrusion effect between the anchor rod and rock and soil around the pile hole is effectively enhanced, 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, in the third step, after the anchoring slurry is poured into the pile hole, the anchoring slurry needs to be maintained for 5-10 hours, and then the fourth step is carried out. This scheme is through at the fourth step of being under construction after anchor slurry initial set, so, after the downthehole anchor rod enlarged footing that forms of stake, can avoid anchor slurry to spill over by the stake hole upper end to further reinforcing anchor rod and stake hole around each other the extrusion interaction between the ground body, the resistance to plucking performance of further promotion anchor rod.
Preferably, the number of the bags is multiple, the bags are sequentially distributed from top to bottom, the grouting cavities are in one-to-one correspondence with the bags, each grouting channel comprises a main channel and a connecting channel in one-to-one correspondence with the corresponding grouting cavity, the upper end of the main channel is communicated with the upper end face of the prefabricated anchor pile, and the connecting channels are connected with the main channels and the corresponding grouting cavities. 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.
Preferably, the outer wall of the enlarged head of the anchor rod abuts against the inner wall of the pile hole.
Preferably, the prefabricated prestressed anchor rod further comprises a vertical grouting pipe arranged on the prefabricated anchor pile, the lower end of the vertical grouting pipe is close to the lower end of the prefabricated anchor pile, and the lower end of the vertical grouting pipe is higher than the lower end of the prefabricated anchor pile. Therefore, in the pile hole grouting in the third step, the vertical grouting pipe can be used for pouring anchoring slurry into the pile hole, so that the actual construction is facilitated.
Preferably, the upper end and the lower end of the bag are hermetically connected with the outer wall of the prefabricated anchor pile.
Preferably, the upper end and the lower end of the bag are respectively and tightly held on the outer wall of the prefabricated anchor pile through stirrups, so that the upper end and the lower end of the bag are in sealing connection with the outer wall of the prefabricated anchor pile. Therefore, the method is convenient for actual processing and manufacturing.
Preferably, the upper end of the prefabricated anchor pile is positioned above the pile hole, and the upper end of the prefabricated anchor pile is buried in the basement bottom plate.
Preferably, the reserved steel bars are in an inverted L shape. So, be favorable to improving the combination steadiness of reservation reinforcing bar and basement bottom plate.
Preferably, the side wall of the prefabricated anchor pile is provided with a side wall bulge. Therefore, the bonding performance between the prefabricated anchor pile and the anchoring slurry can be enhanced through the side wall protrusions.
The utility model provides a prestressing force pole core bag slip casting combination anti component that floats, characterized by, including prefabricated formula prestressing anchor, prefabricated formula prestressing anchor includes crowded expanding equipment, prefabricated anchor pile and buries the vertical prestressing steel in prefabricated anchor pile underground, the upper end of vertical prestressing steel stretches out the top of prefabricated anchor pile and forms the reservation reinforcing bar above prefabricated anchor pile, crowded expanding equipment is including the bag of cover establishing outside prefabricated anchor pile, form the slip casting cavity between bag and prefabricated anchor pile outer wall and set up in prefabricated anchor pile and with the slip casting passageway of slip casting cavity intercommunication, the upper end of slip casting passageway and the upper end intercommunication of prefabricated anchor pile.
The invention has the beneficial effects that: the construction period can be effectively shortened, and the problem of hidden water leakage danger of the basement when the prestressed rod core in the prior art is used is effectively solved; 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 partial structural view of a combined anti-floating member by grouting a prestressed rod core bag before grouting the bag of the present invention.
Fig. 2 is a schematic cross-sectional view taken along line a-a in fig. 1.
Fig. 3 is a partial structural view of a combined anti-floating member injected by a prestressed rod core bag in the process of injecting the bag according to the present invention.
In the figure:
the prefabricated prestressed anchor rod comprises a prefabricated anchor pile 1, prefabricated anchor piles 1.1, vertical prestressed reinforcements 1.2, reserved reinforcements 1.3, a bag 1.4, stirrups 1.5, a grouting channel 1.6, a main channel 1.61, a connecting channel 1.62, side wall protrusions 1.7, vertical grouting pipes 1.8 and a grouting cavity 1.9;
anchoring slurry 3;
Detailed Description
The first embodiment is as follows: as shown in fig. 1, 2 and 3, a construction method of a prestressed rod core-bag grouting combined anti-floating component comprises the following steps,
firstly, pile hole construction, namely drilling a hole at the bottom of a foundation pit to form a pile hole 2.
Secondly, the prefabricated prestressed anchor rod 1 is installed, the prefabricated prestressed anchor rod is placed into the pile hole, and the lower end of the prefabricated prestressed anchor rod is supported at the bottom of the pile hole. The prefabricated prestressed anchor rod comprises a squeezing and expanding device, a prefabricated anchor pile 1.1 and vertical prestressed steel bars 1.2 buried in the prefabricated anchor pile. The upper end of the vertical prestressed reinforcement extends to the upper part of the prefabricated anchor pile and forms a reserved reinforcement 1.3 above the prefabricated anchor pile. The squeezing and expanding device comprises a bag 1.4 sleeved outside the prefabricated anchor pile, a grouting cavity 1.9 formed between the bag and the outer wall of the prefabricated anchor pile and a grouting channel 1.6 arranged in the prefabricated anchor pile and communicated with the grouting cavity. The upper end of the grouting channel is communicated with the upper end of the prefabricated anchor pile. In this embodiment, the vertical prestressed reinforcement is one or more, and the vertical prestressed reinforcement can also be replaced by a steel stranded wire. The prefabricated prestressed anchor rod is a factory prefabricated part, wherein the bag can be assembled in a factory; the bag can also be assembled on site, specifically, the bag is sleeved on the prefabricated anchor pile on site, and the upper end and the lower end of the bag are respectively held on the outer wall of the prefabricated anchor pile through stirrups, so that the upper end and the lower end of the bag are hermetically connected with the outer wall of the prefabricated anchor pile.
Thirdly, grouting the pile hole, pouring anchoring slurry 3 into the pile hole, and filling the gap between the inner wall of the pile hole and the prefabricated prestressed anchor rod. In this embodiment, the anchoring slurry is a concrete slurry.
Fourthly, grouting the bag, namely injecting cement paste with set pressure into the grouting cavity through the grouting channel and the connecting channel to expand the bag and form an anchor rod expanded head in the pile hole; for example, the grouting machine injects cement slurry with the set pressure of 2-10 MPa into the grouting cavity through the grouting channel and the connecting channel, so that the bag expands and an anchor rod expanding head is formed in the pile hole. In this embodiment, the outer wall of the anchor rod enlarged head abuts against the inner wall of the pile hole. When the pile hole at the position of the anchor rod enlarged head is surrounded by the rock-soil body, the anchor rod enlarged head can be locally pressed into the rock-soil body, so that the uplift resistance of the anchor rod is further improved.
And fifthly, constructing the basement bottom plate 4, pouring concrete at the bottom of the foundation pit to form the basement bottom plate, and burying the reserved steel bars above the prefabricated anchor piles in the basement bottom plate.
The construction method of the basement anti-floating structure in the embodiment adopts the prefabricated prestressed anchor rods, vertical prestressed reinforcements are arranged in the prefabricated prestressed anchor rods (the prestressed technology is adopted), and the problem that concrete of common anchor rods is prone to cracking can be effectively solved. Meanwhile, the prefabricated prestressed anchor rods are prefabricated in a factory, and the reserved steel bars above the prefabricated anchor piles are buried in the bottom plate of the basement, so that the process of prestress tensioning after the basement is poured is not needed in site construction, the construction period is greatly shortened, and the problem that the basement using the prestressed anchor rod core in the prior art has the hidden danger of water leakage is effectively solved. More importantly, cement paste with set pressure can be injected into the grouting cavity through the grouting channel and the connecting channel, so that the bag expands and an anchor rod expanded head is formed in the pile hole, and therefore, under the condition that a bottom expanding and hole forming process is omitted, the mutual extrusion effect between the anchor rod and rock and soil around the pile hole is effectively enhanced, and the anti-pulling performance of the anchor rod is effectively improved; and the construction process is simple and the construction cost is low.
Specifically, in the third step, after the anchoring slurry is poured into the pile hole, the anchoring slurry needs to be maintained for 5-10 hours, and then the fourth step is carried out. This scheme is through at the fourth step of being under construction after anchor slurry initial set, so, after the downthehole anchor rod enlarged footing that forms of stake, can avoid anchor slurry to spill over by the stake hole upper end to further reinforcing anchor rod and stake hole around each other the extrusion interaction between the ground body, the resistance to plucking performance of further promotion anchor rod.
In the fourth step, cement paste with set pressure is injected into the grouting cavity through the grouting channel and the connecting channel in the grouting machine, so that the bag expands and an anchor rod expanded head is formed in the pile hole, the grouting machine is separated from the grouting channel, and the upper end opening of the grouting channel is plugged through a plug; or waiting for 3-5 hours, and separating the grouting machine from the grouting channel after the cement paste is initially set.
Further, as shown in fig. 1 and 3, the number of the bags 1.4 is multiple, the bags are sequentially distributed from top to bottom, the grouting cavities correspond to the bags one to one, the grouting channel comprises a main channel 1.61 and a connecting channel 1.62 corresponding to the grouting cavities one to one, the upper end of the main channel is communicated with the upper end face of the prefabricated anchor pile, and the connecting channel is connected with the main channel and the corresponding grouting cavity. 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, the prefabricated prestressed anchor rod further comprises a vertical grouting pipe 1.8 arranged on the prefabricated anchor pile, wherein the lower end of the vertical grouting pipe is close to the lower end of the prefabricated anchor pile, and the lower end of the vertical grouting pipe is higher than the lower end of the prefabricated anchor pile. In this embodiment, vertical slip casting pipe passes through the ribbon ligature to be fixed on the outer wall of prefabricated anchor pile. Of course, the vertical grouting pipe can also be pre-embedded in the prefabricated anchor pile, and the lower end of the vertical grouting pipe is communicated with the lower part of the side wall of the prefabricated anchor pile. Therefore, in the pile hole grouting in the third step, the vertical grouting pipe can be used for pouring anchoring slurry into the pile hole, so that the actual construction is facilitated.
Further, as shown in fig. 1 and 3, the upper end and the lower end of the bag are hermetically connected with the outer wall of the prefabricated anchor pile. The upper end and the lower end of the bag are respectively held tightly on the outer wall of the prefabricated anchor pile through stirrups 1.5, so that the upper end and the lower end of the bag are hermetically connected with the outer wall of the prefabricated anchor pile. Therefore, the method is convenient for actual processing and manufacturing.
Further, as shown in fig. 1 and 3, the upper end of the prefabricated anchor pile is located above the pile hole, and the upper end of the prefabricated anchor pile is buried in the basement bottom plate.
Further, as shown in fig. 1 and 3, the reserved steel bars are in an inverted L shape. So, be favorable to improving the combination steadiness of reservation reinforcing bar and basement bottom plate.
Further, as shown in fig. 1 and 2, the side wall of the prefabricated anchor pile is provided with a side wall bulge 1.7. Therefore, the bonding performance between the prefabricated anchor pile and the anchoring slurry can be enhanced through the side wall protrusions.
The second embodiment is as follows: as shown in fig. 1, 2 and 3, a combined anti-floating member for grouting prestressed rod core-bag comprises a prefabricated prestressed anchor rod 1. The prefabricated prestressed anchor rod comprises a squeezing and expanding device, a prefabricated anchor pile 1.1 and vertical prestressed steel bars 1.2 buried in the prefabricated anchor pile. The upper end of the vertical prestressed reinforcement extends to the upper part of the prefabricated anchor pile and forms a reserved reinforcement 1.3 above the prefabricated anchor pile. The squeezing and expanding device comprises a bag 1.4 sleeved outside the prefabricated anchor pile, a grouting cavity 1.9 formed between the bag and the outer wall of the prefabricated anchor pile and a grouting channel 1.6 arranged in the prefabricated anchor pile and communicated with the grouting cavity. The upper end of the grouting channel is communicated with the upper end of the prefabricated anchor pile. In this embodiment, the vertical prestressed reinforcement is one or more, and the vertical prestressed reinforcement can also be replaced by a steel stranded wire. The prefabricated prestressed anchor rod is a factory prefabricated part, wherein the bag can be assembled in a factory; the bag can also be assembled on site, specifically, the bag is sleeved on the prefabricated anchor pile on site, and the upper end and the lower end of the bag are respectively held on the outer wall of the prefabricated anchor pile through stirrups, so that the upper end and the lower end of the bag are hermetically connected with the outer wall of the prefabricated anchor pile.
As shown in fig. 1 and 3, the number of the bags 1.4 is multiple, the bags are sequentially distributed from top to bottom, the grouting cavities are in one-to-one correspondence with the bags, the grouting channel comprises a main channel 1.61 and connecting channels 1.62 in one-to-one correspondence with the grouting cavities, the upper end of the main channel is communicated with the upper end face of the prefabricated anchor pile, and the connecting channels are connected with the main channel and the corresponding grouting cavities. 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 shown in fig. 2, the prefabricated prestressed anchor rod further comprises a vertical grouting pipe 1.8 arranged on the prefabricated anchor pile, the lower end of the vertical grouting pipe is close to the lower end of the prefabricated anchor pile, and the lower end of the vertical grouting pipe is higher than the lower end of the prefabricated anchor pile. In this embodiment, vertical slip casting pipe passes through the ribbon ligature to be fixed on the outer wall of prefabricated anchor pile. Of course, the vertical grouting pipe can also be pre-embedded in the prefabricated anchor pile, and the lower end of the vertical grouting pipe is communicated with the lower part of the side wall of the prefabricated anchor pile.
Further, as shown in fig. 1 and 3, the upper end and the lower end of the bag are hermetically connected with the outer wall of the prefabricated anchor pile. The upper end and the lower end of the bag are respectively held tightly on the outer wall of the prefabricated anchor pile through stirrups 1.5, so that the upper end and the lower end of the bag are hermetically connected with the outer wall of the prefabricated anchor pile. Therefore, the method is convenient for actual processing and manufacturing.
Further, as shown in fig. 1 and 3, the reserved steel bars are in an inverted L shape. So, be favorable to improving the combination steadiness of reservation reinforcing bar and basement bottom plate.
Further, as shown in fig. 1 and 2, the side wall of the prefabricated anchor pile is provided with a side wall bulge 1.7.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (10)
1. A construction method of a prestressed rod core bag grouting combined anti-floating component is characterized by comprising the following steps,
firstly, constructing a pile hole, namely drilling a hole at the bottom of a foundation pit to form the pile hole;
secondly, the prefabricated prestressed anchor rod is installed, the prefabricated prestressed anchor rod is placed into the pile hole, the prefabricated prestressed anchor rod comprises a squeezing and expanding device, a prefabricated anchor pile and a vertical prestressed steel bar embedded in the prefabricated anchor pile, and the upper end of the vertical prestressed steel bar extends out of the prefabricated anchor pile and forms a reserved steel bar above the prefabricated anchor pile; the squeezing and expanding device comprises a bag sleeved outside the prefabricated anchor pile, a grouting cavity formed between the bag and the outer wall of the prefabricated anchor pile and a grouting channel arranged in the prefabricated anchor pile and communicated with the grouting cavity, and the upper end of the grouting channel is communicated with the upper end of the prefabricated anchor pile;
thirdly, grouting a pile hole, namely grouting anchoring slurry in the pile hole, and filling a gap between the inner wall of the pile hole and the prefabricated prestressed anchor rod;
fourthly, cement paste with set pressure is injected into the grouting cavity through the grouting channel and the connecting channel, so that the bag expands and an anchor rod expanding head is formed in the pile hole;
and fifthly, constructing the basement bottom plate, pouring concrete at the bottom of the foundation pit to form the basement bottom plate, and burying the reserved steel bars above the prefabricated anchor piles in the basement bottom plate.
2. The construction method of the prestressed rod core-bag grouting combined anti-floating structural member as claimed in claim 1, wherein in the third step, after the anchoring slurry is poured into the pile hole, the anchoring slurry is cured for 5-10 hours, and then the fourth step is performed.
3. The construction method of the prestressed rod core-bag grouting combined anti-floating member as claimed in claim 1, wherein the number of the bags is plural, and the plural bags are sequentially distributed from top to bottom, the grouting cavities correspond to the bags one to one, the grouting channel includes a main channel and a connecting channel corresponding to the grouting cavities one to one, the upper end of the main channel is communicated with the upper end face of the prefabricated anchor pile, and the connecting channel connects the main channel and the corresponding grouting cavity.
4. The construction method of the prestressed rod core-bag grouting combined anti-floating component as claimed in claim 1, 2 or 3, wherein the outer wall of the enlarged head of said anchor rod abuts against the inner wall of the pile hole.
5. The construction method of the prestressed rod core-bag grouting combined anti-floating member as claimed in claim 1, 2 or 3, wherein said prefabricated prestressed anchor rod further comprises a vertical grouting pipe disposed on the prefabricated anchor pile, a lower end of the vertical grouting pipe is adjacent to a lower end of the prefabricated anchor pile, and a lower end of the vertical grouting pipe is higher than the lower end of the prefabricated anchor pile.
6. The construction method of the prestressed rod core bag grouting combined anti-floating member as claimed in claim 1, 2 or 3, wherein the upper and lower ends of the bag are hermetically connected with the outer wall of the prefabricated anchor pile.
7. The construction method of the prestressed rod core-bag grouting combined anti-floating member as claimed in claim 6, wherein the upper and lower ends of the bag are respectively held tightly to the outer wall of the prefabricated anchor pile by stirrups, so that the upper and lower ends of the bag are hermetically connected to the outer wall of the prefabricated anchor pile.
8. The construction method of the prestressed rod core-bag grouting combined anti-floating member as claimed in claim 1, 2 or 3, wherein the preformed reinforcement is in an inverted L shape.
9. The construction method of the prestressed rod core-bag grouting combined anti-floating member as claimed in claim 1, 2 or 3, wherein the side wall of said prefabricated anchor pile is provided with side wall protrusions.
10. The utility model provides a prestressing force pole core bag slip casting combination anti component that floats, characterized by, including prefabricated formula prestressing anchor, prefabricated formula prestressing anchor includes crowded expanding equipment, prefabricated anchor pile and buries the vertical prestressing steel in prefabricated anchor pile underground, the upper end of vertical prestressing steel stretches out the top of prefabricated anchor pile and forms the reservation reinforcing bar above prefabricated anchor pile, crowded expanding equipment is including the bag of cover establishing outside prefabricated anchor pile, form the slip casting cavity between bag and prefabricated anchor pile outer wall and set up in prefabricated anchor pile and with the slip casting passageway of slip casting cavity intercommunication, the upper end of slip casting passageway and the upper end intercommunication of prefabricated anchor pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111625008.3A CN114525781A (en) | 2021-12-28 | 2021-12-28 | Prestressed rod core bag grouting combined anti-floating component and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111625008.3A CN114525781A (en) | 2021-12-28 | 2021-12-28 | Prestressed rod core bag grouting combined anti-floating component and construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114525781A true CN114525781A (en) | 2022-05-24 |
Family
ID=81619282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111625008.3A Pending CN114525781A (en) | 2021-12-28 | 2021-12-28 | Prestressed rod core bag grouting combined anti-floating component and construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114525781A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116065580A (en) * | 2023-03-31 | 2023-05-05 | 中冶建筑研究总院有限公司 | High-bearing-capacity multi-bag expansion anchor rod drilling and expanding structure and integrated construction method thereof |
-
2021
- 2021-12-28 CN CN202111625008.3A patent/CN114525781A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116065580A (en) * | 2023-03-31 | 2023-05-05 | 中冶建筑研究总院有限公司 | High-bearing-capacity multi-bag expansion anchor rod drilling and expanding structure and integrated construction method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104775428A (en) | Compound-type prestressed anchor cable structure and construction method thereof | |
| CN108951611B (en) | Canal type cutting assembly type underground continuous wall and construction method | |
| CN104878835A (en) | Strip-shaped foundation house rear basement structure | |
| CN102808414B (en) | Bonded post-tensioned prestressed anchoring construction method for cast-in-place concrete structure | |
| CN111058463B (en) | Construction method of rock steep slope high cantilever slope-collecting reinforcing structure | |
| CN103410144B (en) | Prestressed reinforcement piles set into rock and construction method | |
| CN105220714A (en) | Core compound prestress pile tube float Structure construction method filled with by built-in anchor cable | |
| CN114525781A (en) | Prestressed rod core bag grouting combined anti-floating component and construction method | |
| CN212052717U (en) | Structure for penetrating karst cave of precast tubular pile | |
| CN112227353A (en) | Assembled integral static pressure pile | |
| CN112049158A (en) | Bottom-expanding type prestress composite anchor cable uplift pile and preparation method thereof | |
| CN1050421A (en) | The piling method of casting prefabricated composite pile | |
| CN115478533A (en) | PHC pipe pile core pouring method under confined water condition | |
| CN213867907U (en) | Prefabricated expanded packing key type digging foundation for power transmission line | |
| CN217460548U (en) | Bag grouting squeezing and expanding combined anchor rod with built-in prestressed rod core | |
| CN211368723U (en) | Novel grouting pipe | |
| CN203755292U (en) | Weak bearing stratum foundation reinforcing structure | |
| CN111910671A (en) | Prestressed anchor rod combined excavation composite foundation and construction method thereof | |
| CN206070512U (en) | A kind of coercion underground continuous wall with U-shaped post stretching tensioning | |
| CN216405399U (en) | Slow bonding prestress anti-floating anchor rod connecting device | |
| CN218405392U (en) | Concrete pile structure based on bearing capacity lifting | |
| CN220746899U (en) | Stirring pile tension type prestress steel strand anti-floating anchor rod | |
| CN220768043U (en) | Stirring pile pressure type prestress steel strand anti-floating anchor rod | |
| CN217078736U (en) | Assembled stock | |
| CN215483155U (en) | Prefabricated anti-floating anchor rod pile and underground anti-floating structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |