CN118326961A - Composite prestress steel bar - Google Patents
Composite prestress steel bar Download PDFInfo
- Publication number
- CN118326961A CN118326961A CN202410690408.XA CN202410690408A CN118326961A CN 118326961 A CN118326961 A CN 118326961A CN 202410690408 A CN202410690408 A CN 202410690408A CN 118326961 A CN118326961 A CN 118326961A
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- Prior art keywords
- steel bar
- sleeve
- prestress
- plastic
- section
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- 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.)
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 87
- 239000010959 steel Substances 0.000 title claims abstract description 87
- 239000002131 composite material Substances 0.000 title claims abstract description 15
- 239000004033 plastic Substances 0.000 claims abstract description 43
- 238000004873 anchoring Methods 0.000 claims abstract description 30
- 239000004567 concrete Substances 0.000 claims abstract description 28
- 238000007789 sealing Methods 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000012806 monitoring device Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 24
- 239000011435 rock Substances 0.000 abstract description 19
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 208000035389 Ring chromosome 6 syndrome Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000011378 shotcrete Substances 0.000 description 2
- 101150071434 BAR1 gene Proteins 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- E02D5/74—Means for anchoring structural elements or bulkheads
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a composite prestress steel bar, which comprises a main body part capable of passing through a foundation structure and a fixing part for fixing, wherein the main body part comprises a tensioning section and an anchoring section, and the tensioning section and the anchoring section are connected into a whole; the stretching section comprises an innermost layer of prestress steel rod, a precast grouting concrete layer is arranged outside the prestress steel rod, a plastic corrugated sleeve is sleeved outside the precast grouting concrete layer, a plastic smooth sleeve is sleeved outside the plastic corrugated sleeve, and site grouting concrete is arranged outside the plastic smooth sleeve; the fixing part is used for fixing the stretched position of the prestressed steel bar. The invention forms a supporting system for weak surrounding rock through the prestress steel bar technology, can apply prestress at the construction primary stage, provides timely supporting for the surrounding rock, and then further enhances the stability of the supporting system through the pressurizing and tensioning of the supporting system, can rapidly apply prestress and timely adjust the prestress distribution, effectively improves the construction efficiency and shortens the construction period.
Description
Technical Field
The invention relates to the field of underground engineering support, in particular to a composite prestress steel bar.
Background
Underground works refer to various construction activities performed below the earth's surface, including but not limited to, construction of subways, tunnels, underground garages, underground malls, and the like. Underground engineering is characterized by complex construction environment, and special attention is required to stability and safety of engineering. The anchor bolt support is a common underground engineering support method, and the surrounding rock is stabilized against displacement or collapse by drilling holes in the surrounding rock or soil body, implanting anchor bolts, and then applying a tensile force to the outer ends of the anchor bolts so as to generate friction force or anchoring force between the anchor bolts and the surrounding rock. The prestressed anchor cable is a supporting mode of applying pre-tension in the anchor cable, surrounding rock or supporting structure can be compressed in advance through the prestressed anchor cable, the overall stability of the prestressed anchor cable is improved, and the prestressed anchor cable is commonly used for treating high-stress and large-deformation complex geological conditions. The prestress steel bar is similar to the prestress anchor cable, and is a material for enhancing the stability of the support structure in a pretension applying mode. Prestressed steel bars are commonly used to strengthen surrounding rock or supporting structures, providing additional support.
In the traditional underground engineering supporting method, the techniques of anchor bolt supporting, shotcrete, prestressed anchor cable and the like are widely applied, and the methods have advantages, but have respective limitations. For example, the bolting effect of the bolting in weak surrounding rock is limited; the sprayed concrete can form a supporting layer quickly, but is easy to crack under the condition of high stress; the prestressed anchor cable can provide great supporting force, but the biggest problem is that the prestressed anchor cable is easy to collapse when encountering weak surrounding rock, is difficult to hole, brings a plurality of inconveniences to construction, simultaneously requires higher technical requirements and cost for applying the prestressed anchor cable, and under complex geological conditions, a single prestressed anchor cable supporting system can not meet the requirement of construction stability, and even potential safety hazards appear. Meanwhile, the traditional stress anchor cable supporting method can provide larger supporting force, but the construction process is complex when the traditional stress anchor cable supporting method meets weak surrounding rock, the construction difficulty is very high, drilling holes collapse, insufficient grouting amount and the like are often caused, and higher technical requirements and cost are required for completing anchoring.
Therefore, a composite prestress steel bar is provided to solve the technical problems.
Disclosure of Invention
The invention solves the technical problems that the single prestressed anchor cable construction is easy to generate borehole collapse and insufficient grouting amount when encountering weak surrounding rock, and the single anchor cable construction cannot meet the construction stability requirement under complex geology, and the problems of high technical requirement and high cost for completing the anchoring are solved.
In order to solve the technical problems, the invention adopts the following technical scheme: the composite prestress steel bar comprises a main body part capable of passing through a foundation structure and a fixing part used for fixing, wherein the main body part comprises a tensioning section and an anchoring section, and the tensioning section and the anchoring section are connected into a whole;
The stretching section comprises an innermost layer of prestress steel bar, a precast grouting concrete layer is arranged outside the prestress steel bar, a plastic corrugated sleeve is sleeved outside the precast grouting concrete layer, a plastic smooth sleeve is sleeved outside the plastic corrugated sleeve, and site grouting concrete is arranged outside the plastic smooth sleeve;
The anchoring section comprises an innermost layer of prestress steel rod, a precast grouting concrete layer is arranged outside the prestress steel rod, and a plastic corrugated sleeve is sleeved outside the precast grouting concrete layer; the plastic corrugated sleeve is sleeved with a plurality of anchoring isolators, and each anchoring isolator is annular and provided with a plurality of radial outward bulges;
The slurry inlet pipe penetrates through all the rubber sealing rings along the axial direction of the prestress steel rod and is communicated with the tail end of the main body part; the slurry outlet pipes penetrate through each rubber sealing ring along the axial direction of the prestress steel rod respectively;
the fixing part is used for fixing the stretched position of the prestressed steel bar.
Specifically, the fixed part comprises a first base plate and a second base plate which are mutually connected through an inclination angle compensation plate, the first base plate is positioned on one side of the second base plate close to the top end of the prestressed reinforcement, the prestressed steel rod sequentially penetrates through the annular first base plate and the annular second base plate, a threaded section is reserved in the upper half part of the prestressed steel rod, and the prestressed steel rod is locked on the first base plate through the threaded section and a nut.
Further, the second backing plate is an inclined plate, and after the prestress steel bar is inserted into Zhang Lakong, the second inclined plate is attached to the concrete foundation.
In particular, the outside of the plastic smooth sleeve is also coated with corrugated steel pipes at a plurality of positions.
Particularly, the bottom end of the prestress steel bar is provided with a guide cap, and the guide cap is connected with the plastic corrugated sleeve through a sealing ring.
In particular, the bottom end of the plastic smooth sleeve is provided with a shrink sleeve, and the plastic smooth sleeve tightly clamps the outer surface of the plastic corrugated sleeve through the shrink sleeve.
In particular, the stress surface of the second backing plate is provided with a plurality of stress monitoring sensors, and the stress monitoring sensors are electrically connected with an external monitoring device.
In particular, the outer end of the prestress steel rod is also sleeved with a steel protective cap which covers the thread section and the nut.
Compared with the prior art, the invention has the following advantages and beneficial effects: the invention forms a supporting system for weak surrounding rock by a prestress steel bar technology, can apply prestress at the primary stage of construction, provides timely supporting for the surrounding rock, and further enhances the stability of the supporting system by pressurizing and tensioning the surrounding rock. Meanwhile, the prestress can be rapidly applied and the prestress distribution can be timely adjusted, so that the construction efficiency is effectively improved, and the construction period is shortened.
Drawings
FIG. 1 is a schematic view of the overall structure of the device of the present invention.
Fig. 2 is a schematic structural view of the fixing portion at a in fig. 1.
Fig. 3 is a schematic view of the structure of the stretch-break section at B in fig. 1.
Fig. 4 is a schematic view of the structure of the anchoring section at C in fig. 1.
Fig. 5 is a schematic view of the internal structure of the anchoring section at C in fig. 1.
Fig. 6 is a schematic structural view of the guide cap at D in fig. 1.
The definitions of the various numbers in the figures are: prestress steel bar-1; pre-pouring a grouting concrete layer-2; grouting concrete on site-21; plastic corrugated sleeve 3; plastic smooth sleeve-4; anchoring the isolator-5; rubber sealing ring-6; a slurry inlet pipe 7; a slurry outlet pipe-8; a first pad-9; a second backing plate-10; an inclination angle compensation plate-11; a nut-12; corrugated steel pipe-13; a guide cap-14.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so as to further understand the concept of the present invention, the technical problems to be solved, the technical features constituting the technical solutions, and the technical effects brought thereby.
As shown in fig. 1 and 3, a composite prestress steel bar comprises a main body part capable of passing through a foundation structure and a fixing part for fixing, wherein the main body part comprises a tensioning section and an anchoring section, and the tensioning section and the anchoring section are connected into a whole;
The stretching section comprises an innermost layer of prestressed steel rod 1, a precast grouting concrete layer 2 is arranged outside the prestressed steel rod 1, a plastic corrugated sleeve 3 is sleeved outside the precast grouting concrete layer 2, a plastic smooth sleeve 4 is sleeved outside the plastic corrugated sleeve 3, and site grouting concrete 21 is arranged outside the plastic smooth sleeve 4;
The anchoring section comprises an innermost layer of prestressed steel rod 1, a pre-cast grouting concrete layer 2 is arranged outside the prestressed steel rod 1, and a plastic corrugated sleeve 3 is sleeved outside the pre-cast grouting concrete layer 2; the plastic corrugated sleeve pipe 3 is sleeved with a plurality of anchoring isolators 5, and each anchoring isolator 5 is annular and provided with a plurality of radial outward bulges;
The device also comprises a plurality of rubber sealing rings 6 sleeved outside the plastic smooth sleeve 4 of the tensioning section, and a slurry inlet pipe 7 which axially penetrates through all the rubber sealing rings 6 along the prestress steel bar 1 and is communicated with the tail end of the main body part; the device also comprises a plurality of slurry outlet pipes 8 which respectively penetrate through each rubber sealing ring 6 along the axial direction of the prestress steel bar 1;
The fixing part is used for fixing the stretched position of the prestressed steel bar 1.
The main construction process of the invention is as follows: firstly, drilling, inserting the device into the drill hole, grouting the prestressed steel rod 1 and the plastic corrugated sleeve 3, and pouring the precast grouting concrete layer 2, wherein the grouting amount is the total submerged anchoring section. And tensioning the prestressed steel bar 1 after the anchoring section is completely fixed by the slurry, fixing the prestressed steel bar by the fixing part after tensioning to preset stress, and anchoring the concrete layer 2 by pouring the residual precast pipe. In this process, the anchoring isolator 5 plays a role in supporting the hole wall in a certain auxiliary manner, and also plays a role in positioning the prestressed steel rod 1, so as to avoid deflection of the prestressed steel rod 1.
As a preferred embodiment, the fixing portion includes a first pad 9 and a second pad 10 which are connected to each other by an inclination angle compensation plate 11, the first pad 9 is located on one side of the second pad 10 near the top end of the prestressed reinforcement, the prestressed steel rod 1 sequentially penetrates through the annular first pad 9 and the second pad 10, a threaded section is reserved at the upper half of the prestressed steel rod 1, and the prestressed steel rod 1 is locked on the first pad 9 by the threaded section and a nut 12.
In this embodiment, a specific structure of the fixing portion is provided, as shown in fig. 2, in which the first pad 9 and the second pad 10 are connected together by the inclination compensating plate 11, and the second pad 10 is used to cling to the concrete foundation structure to provide the overall bearing capacity. The prestress steel bar 1 passes through the first backing plate 9 and is fixed by a nut 12.
As a further embodiment, the second backing plate 10 is an inclined plate, and the second inclined plate is attached to the concrete foundation after the prestressed steel rod 1 is inserted into Zhang Lakong.
In this embodiment, the inclination compensating plate 11 is provided with a plurality of different lengths and inclinations to adapt to different slopes, and may be replaced by a metal block or even grouting.
As a further embodiment, the outer end of the prestressed steel rod 1 is further sleeved with a steel protecting cap covering the threaded section and the nut 12.
As a preferred embodiment, the plastic smooth sleeve 4 is further covered with corrugated steel pipes 13 at a plurality of positions.
In this embodiment, the corrugated steel pipe 13 has the function of increasing the contact force with the concrete and ensuring the overall anchoring effect.
As a preferred embodiment, the bottom end of the prestress steel bar 1 is provided with a guide cap 14, and the guide cap 14 is connected with a plastic corrugated sleeve through a sealing ring.
In this embodiment, as shown in fig. 6, the guide cap 14 is used to ensure continuity of the bottom end of the prestressed steel plate 1 when it is inserted into the inside of the borehole, and to effectively remove the stopper during the insertion.
As a preferred embodiment, the bottom end of the plastic smooth sleeve 4 is provided with a shrink sleeve, and the plastic smooth sleeve 4 is clamped on the outer surface of the plastic corrugated sleeve through the shrink sleeve.
In this embodiment, the purpose of the shrink sleeve is to ensure that the grout does not enter the free section when the anchor section is grouted.
As a preferred embodiment, the stress surface of the second pad 10 is provided with a plurality of stress monitoring sensors, and the stress monitoring sensors are electrically connected with an external monitoring device.
In the embodiment, the prestress steel bar 1 starts to apply prestress at the initial stage of construction, and provides immediate support for surrounding rock. As shown in fig. 4-5, the stability of the support system is further enhanced by pressurizing and stretching the support system; the stress monitoring sensor is used for collecting and reading corresponding stress, so that constructors can timely adjust tensioning force according to real-time stress data of the prestressed steel rod to adapt to geological condition change or load increase possibly occurring in the operation process of underground engineering, and long-term stability and safety of the engineering are ensured. The concrete adjustment mode is that the prestress steel bar 1 is prevented from rebounding by pressurizing and tensioning again under the condition that the position of the nut 12 is kept unchanged and then adjusting the locking position of the nut 12; or the tensioning is slightly pressurized with the nut 12 held unchanged, and then the position of the nut 12 is reversed, thereby releasing the tensioning pressure to reduce the tensioning pressure.
Aiming at the problems that the traditional underground engineering supporting method has insufficient supporting strength in complex geological conditions or large-span underground space and complex surrounding rock is easy to collapse, the invention forms a supporting system aiming at weak surrounding rock through a prestress steel bar technology, and effectively improves the stability of an underground structure. The traditional support method often involves complicated construction flow and long maintenance period, and the implementation of the invention can obviously shorten the construction period and improve the construction efficiency through rapid prestress application and adjustment. By optimizing the design and construction flow of the support system, the invention is beneficial to reducing the materials and manpower required by underground engineering support, thereby reducing the overall construction cost. The inner layer grouting and the corrugated pipe have the functions of corrosion prevention, are processed in factories, and the outer layer grouting is used for anchoring the steel bars; the corrugated pipe for the anchoring section can anchor the steel rod during grouting, and can avoid the steel rod from falling off. That is, the invention provides an underground engineering support technology based on a prestressed steel bar on the basis of the prior art. The technology not only utilizes the advantages of the prestressed anchor cable, but also has very effective effect on the support of weak surrounding rock through the intervention of the sleeve, and is already applied to practical engineering. The prestress steel bar is subjected to prestress at the initial stage of construction, and instant support is provided for surrounding rock; the stability of the support system is further enhanced by its subsequent compression and stretching. The prestress support system can be more effectively adapted to complex geological conditions, and stronger support force is provided.
The terms "connected" and "fixed" used in the description of the present invention may be fixed, formed, welded, or mechanically connected, and the specific meaning of the terms in the present invention is understood in specific cases.
In the description of the present invention, the terms "center," "upper," "lower," "horizontal," "inner," "outer," and the like are used merely for convenience in describing the present invention and to simplify the description, and do not denote or imply a particular orientation that the device or element in question must have, and thus should not be construed as limiting the invention.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will appreciate that; the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. The composite prestress steel bar is characterized by comprising a main body part capable of passing through a foundation structure and a fixing part used for fixing, wherein the main body part comprises a tensioning section and an anchoring section, and the tensioning section and the anchoring section are connected into a whole;
The stretching section comprises an innermost layer of prestress steel bar (1), a precast grouting concrete layer (2) is arranged outside the prestress steel bar (1), a plastic corrugated sleeve (3) is sleeved outside the precast grouting concrete layer (2), a plastic smooth sleeve (4) is sleeved outside the plastic corrugated sleeve (3), and site grouting concrete (21) is arranged outside the plastic smooth sleeve (4);
The anchoring section comprises a prestress steel bar (1) of an innermost layer, a precast grouting concrete layer (2) is arranged outside the prestress steel bar (1), and a plastic corrugated sleeve (3) is sleeved outside the precast grouting concrete layer (2); the plastic corrugated pipe is characterized by further comprising a plurality of anchoring isolators (5) sleeved outside the plastic corrugated pipe (3), wherein the anchoring isolators (5) are annular and provided with a plurality of radial outward bulges (51);
The device also comprises a plurality of rubber sealing rings (6) sleeved outside the plastic smooth sleeve (4) of the tensioning section, and a slurry inlet pipe (7) which axially penetrates through all the rubber sealing rings (6) along the prestress steel bar (1) and is communicated with the tail end of the main body part; the slurry outlet pipes (8) respectively penetrate through each rubber sealing ring (6) along the axial direction of the prestress steel bar (1);
The fixing part is used for fixing the stretched position of the prestressed steel bar (1).
2. A composite prestressed steel bar according to claim 1, wherein the fixing part comprises a first base plate (9) and a second base plate (10) which are mutually connected through an inclination angle compensation plate (11), the first base plate (9) is positioned on one side of the second base plate (10) close to the top end of the prestressed steel bar, the prestressed steel bar (1) sequentially penetrates through the annular first base plate (9) and the second base plate (10), a threaded section is reserved at the upper half part of the prestressed steel bar (1), and the prestressed steel bar (1) is locked on the first base plate (9) through the threaded section and a nut (12).
3. A composite pre-stressed steel bar according to claim 2, wherein the second backing plate (10) is an inclined plate, and the second inclined plate is attached to the concrete foundation after the pre-stressed steel bar (1) is inserted into Zhang Lakong.
4. A composite pre-stressed steel rod as claimed in claim 2, wherein the outer end of the pre-stressed steel rod (1) is further sleeved with a steel protective cap covering the threaded section and the nut (12).
5. A composite pre-stressed steel rod as claimed in claim 1, wherein corrugated steel pipes (13) are also wrapped around the plastic smooth sleeve (4).
6. A composite pre-stressed steel bar according to claim 1, wherein the bottom end of the pre-stressed steel bar (1) is provided with a guide cap (14), and the guide cap (14) is connected with the plastic corrugated sleeve (3) through a sealing ring.
7. A composite pre-stressed steel rod as claimed in claim 1, wherein the bottom end of the plastic smooth sleeve (4) is a shrink sleeve, and the plastic smooth sleeve (4) is clamped on the outer surface of the plastic corrugated sleeve (3) through the shrink sleeve.
8. A composite pre-stressed steel bar according to claim 1, characterized in that the stress surface of the second backing plate (10) is provided with a number of stress monitoring sensors, which are electrically connected to an external monitoring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410690408.XA CN118326961A (en) | 2024-05-30 | 2024-05-30 | Composite prestress steel bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410690408.XA CN118326961A (en) | 2024-05-30 | 2024-05-30 | Composite prestress steel bar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118326961A true CN118326961A (en) | 2024-07-12 |
Family
ID=91770415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410690408.XA Pending CN118326961A (en) | 2024-05-30 | 2024-05-30 | Composite prestress steel bar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118326961A (en) |
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2024
- 2024-05-30 CN CN202410690408.XA patent/CN118326961A/en active Pending
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