CN210163848U - External reinforcing apparatus of reinforced concrete roof beam - Google Patents
External reinforcing apparatus of reinforced concrete roof beam Download PDFInfo
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- CN210163848U CN210163848U CN201920971708.XU CN201920971708U CN210163848U CN 210163848 U CN210163848 U CN 210163848U CN 201920971708 U CN201920971708 U CN 201920971708U CN 210163848 U CN210163848 U CN 210163848U
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Abstract
The utility model discloses an external reinforcing apparatus of reinforced concrete roof beam, set up two prestressing force reinforcement units on two beam walls of reinforced concrete roof beam including the symmetry, prestressing force reinforcement unit includes two anchor pieces, at least one rest pad, two ground tackle and an at least steel strand wires. The utility model also discloses a reinforced concrete beam structure reinforcing method of harbor worker, including following step: step 1) beam body pore-forming, step 2) anchoring block pouring, step 3) supporting block pouring, step 4) anchorage installation, step 5) steel strand blanking, step 6) jack installation, step 7) prestress tensioning of steel strands, step 8) beam bottom concrete chiseling and original corrosion main rib removing, and step 9) beam bottom section enlarging and reinforcing. The advantages are that: the utility model discloses rigidity and bearing capacity to reinforced concrete beam structure improve the effect obvious, and the construction operation is more convenient, and the quality is controllable, can extensively be used for various port worker reinforced concrete beam structure to consolidate and reform transform the engineering.
Description
Technical Field
The utility model relates to a technical field is consolidated to the harbor worker's structural engineering, specifically is an external reinforcing apparatus of reinforced concrete roof beam.
Background
The dock structure is corroded by seawater for a long time along with the increase of service time, the concrete can be carbonized and chloride ions are increased, the durability of the dock structure is reduced, particularly, the bottom of a beam is located in a splash zone, the serious phenomena of concrete crack cracking and steel bar corrosion easily occur, the bearing capacity of the structure is further reduced, and measures such as reinforcing and reinforcing are needed to be taken. At present, the structure reinforcing method for the reinforced concrete beam mainly comprises a section enlarging reinforcing method, a steel plate pasting reinforcing method, a carbon fiber pasting reinforcing method, a prestress reinforcing method and the like, and the methods have advantages and disadvantages.
The cross section reinforcing method is increased, the self weight and the cross section size of the structure are increased, but the rigidity distribution of the structure is possibly changed while the bearing capacity of the reinforced concrete beam is improved, the interlocking reinforcement of other adjacent components is caused, and new damage to the original structure is caused by permanent load in the construction period.
The steel plate reinforcing method is to paste steel plate onto the surface of reinforced concrete beam with special adhesive to reinforce the beam and strengthen the beam.
The carbon fiber pasting reinforcing method is characterized in that carbon fibers are adopted to replace steel plates to be pasted on the beam, and compared with steel plate pasting, the carbon fiber pasting reinforcing method is economical, light in material weight, simple in construction, high in construction speed, good in bending resistance and shearing resistance reinforcing effect on the original structure, small in improvement on the original structure rigidity, and few in domestic research on reliability of improving the torsional bearing capacity.
The prestress reinforcement method has obvious improvement on the bearing capacity of the structure, but is complex in construction and relatively small in improvement on the rigidity of the structure.
Therefore, the existing traditional reinforcing methods have certain defects in different degrees, and the single reinforcing method is difficult to meet the requirement of safe use of the harbor engineering structure.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the not enough among the above-mentioned prior art, provide an adopt external prestressing force and increase the structure strengthening method that the cross-section combines together and improves harbor worker reinforced concrete roof beam rigidity and bearing capacity.
In order to achieve the above purpose, the utility model can be realized by the following technical scheme.
A reinforced concrete beam external reinforcing device comprises two prestress reinforcing units symmetrically arranged on two beam walls of a reinforced concrete beam,
the prestress reinforcing unit comprises two anchoring blocks, at least one supporting block, two anchors and at least one steel strand,
the two anchoring blocks are arranged at the two ends of the reinforcing area of the beam wall of the reinforced concrete beam, and all the supporting blocks are arranged between the two anchoring blocks at equal intervals and arranged on the beam wall of the reinforced concrete beam; the two anchoring blocks and all the supporting blocks are tightly fixed with the beam wall of the reinforced concrete beam to ensure the rigidity and the bearing capacity of the anchoring blocks and the supporting blocks;
the steel strand penetrates into the two anchoring blocks and all the supporting blocks, the two anchors are respectively arranged on the end faces of the outer sides of the two anchoring blocks, and the two ends of the steel strand penetrate through the two anchors; and (4) pre-tensioning the steel strands on the two anchors through the added jacks.
The jack of the technical proposal of the utility model is fixedly arranged on the anchorage device, and the jack is tightly connected with the anchorage device through the tool anchor; the output end of the jack can drive the anchorage device to apply prestress to the steel strand. The utility model discloses jack and ground tackle among the technical scheme are this technical field's common general knowledge, and jack and ground tackle are the outsourcing spare, directly purchase the acquisition.
The utility model discloses technical scheme's concrete adopts grouting material and pea gravel concrete, and the steel strand wires adopt individual layer unbonded epoxy spraying steel strand wires.
It is right to the utility model discloses technical scheme's preferred, all imbed the PVC sleeve pipe that supplies the steel strand wires to penetrate in two anchor blocks and all supporting blocks.
Right the utility model discloses technical scheme's preferred, anchor piece and rest pad are pour by the grout and are made.
To the utility model discloses technical scheme's preferred, the PVC sleeve pipe is pre-buried in anchor block and supporting block.
Right the utility model discloses technical scheme's preferred, at the pre-buried income ground tackle backing plate of the outside terminal surface of two anchor pieces, two ground tackle backing plates are connected respectively to two ground tackle.
It is right to the utility model discloses technical scheme's preferred, adopt the drilling to get the core machine on the beam wall of reinforced concrete roof beam and perforate in pairs on the roof beam body to the utilization is pour formation anchor piece and rest pad node to the perforation, and anchor piece and rest pad partly are located downthehole, another part is located outside the hole. The utility model discloses technical scheme's anchor piece and supporting block adopt reinforced concrete to pour, open through the roof beam wall side and pour perforation and roof beam and be connected formation overall structure.
The utility model also provides an adopt reinforced concrete roof beam external reinforcing apparatus's reinforcement method, a serial communication port, including following step:
step 1) beam body pore-forming
Processing a plurality of evenly spaced through holes on two symmetrical beam walls of the reinforced concrete beam to be reinforced, and roughening the concrete around the holes;
step 2) pouring of the anchoring block
Adopting grouting materials to pour node anchoring blocks in two opposite through holes at two ends of the outermost side of the reinforced area on the two symmetrical beam walls, and maintaining; one part of the anchoring block is positioned in the hole, and the other part of the anchoring block is positioned outside the hole; embedding an anchorage device base plate and a PVC sleeve in advance before pouring the anchoring block;
step 3) casting of the supporting block
Pouring the supporting blocks in all the other pairs of through holes on the two symmetrical beam walls by grouting materials, and maintaining; one part of the supporting block is positioned in the hole, and the other part of the supporting block is positioned outside the hole; pre-embedding a PVC sleeve in advance before pouring the supporting block;
step 4) anchor installation
When the material strength of the anchoring block in the step 3 and the material strength of the supporting block in the step 4 reach the required strength, mounting an anchorage on an anchorage backing plate in the anchoring block on the reinforced concrete beam by using structural adhesive, and maintaining;
step 5) steel strand blanking
The steel strand penetrates into the reserved hole channels of the anchoring block and the supporting block, the steel strand is manually pulled, and the exposed lengths of two ends of the steel strand are consistent;
step 6) Jack installation
Jacks are respectively arranged on all the anchorage devices on the reinforced concrete beam, and two ends of the steel strand are penetrated into the jacks; aligning the center of the anchor with the center of the PVC sleeve, adjusting the position of the jack to enable the jack to be positioned on the same axis with the PVC sleeve and the anchor, and enabling the jack to be in contact and close contact with the anchor;
step 7) prestress tension of steel strand
Opening all jacks, pre-tensioning the steel strand to enable the steel strand to reach a stressed state from a relaxed state, and eliminating an elongation value measurement error;
performing formal tensioning after pre-tensioning, wherein the prestress tensioning is divided into five stages of 0 sigma con to 0.2 sigma con, 0.2 sigma con to 0.4 sigma con, 0.4 sigma con to 0.6 sigma con, 0.6 sigma con to 0.8 sigma con and 0.8 sigma con to 1.0 sigma con, wherein the sigma con represents tensioning control stress, standing for 1-2min after each loading stage is loaded, tensioning again after the steel strand is deformed stably, and removing the jack after the tensioning control stress is reached;
step 8) chiseling beam bottom concrete and removing original corrosion main ribs
After the reinforced concrete beam is reinforced by adopting external prestress, an electric hammer is matched with manual work to chisel degraded concrete at the bottom layer of the beam to 20-30 mm behind a main rib, the degraded concrete is cleaned to a compact part, an original corroded main rib is removed, a joint surface is roughened, and edges and corners of the original beam are knocked off; cleaning the surfaces of the steel bars and the concrete by using high-pressure fresh water, and immediately brushing the cement-based migration type steel bar rust-resisting coating twice after cleaning the base;
step 9) reinforcing the enlarged section of the beam bottom
And (4) according to the beam structure rechecking calculation, determining the enlarged section size of the reinforced concrete beam and the number of reinforcing steel bars.
It is right the utility model discloses technical scheme's improvement, every adjacent two equals to the pitch-row between the perforation in step 1, and adjacent pitch-row is about the twice of roof beam height.
It is right to the utility model discloses technical scheme's improvement, in step 2 and step 3 an anchor block and a supporting block in can pre-buried a plurality of PVC sleeve pipes, pre-buried PVC sleeve pipe quantity equals in an anchor block and a supporting block, PVC sheathed tube pre-buried quantity equals with steel strand wires's quantity in an anchor block and a supporting block.
It is right to the utility model discloses technical scheme's improvement, the bar planting in step 9 on the beam wall of reinforced concrete roof beam to add the reinforced concrete material of certain thickness in reinforced concrete roof beam lower part, newly-increased concrete wraps up external prestressing force device wherein. The reinforcing of the beam is realized by enlarging the section, and the unbonded steel strand is wrapped in the reinforced beam, so that the corrosion resistance problem of the unbonded steel strand is effectively solved.
The reinforcing method combines the external prestress reinforcing technology and the section enlarging reinforcing technology, can give full play to the advantages of the external prestress reinforcing technology and the section enlarging reinforcing technology, can improve the stress condition of the beam structure, increase the safety in the construction period, and can improve the rigidity and the bearing capacity of the beam structure at the same time.
Compared with the prior art, the utility model, its beneficial effect is:
1. the utility model applies external prestress to the damaged reinforced concrete beam, on one hand, the beam structure has certain 'upwarp' effect, improves the stress state of the beam structure, and has certain closing effect on the concrete crack at the bottom of the beam structure; on the other hand, the bearing capacity of the damaged reinforced concrete beam can be increased, and the safety problem of the reinforced concrete beam in the reinforcing construction period is effectively solved.
2. The utility model discloses combine together external prestressing force reinforcement technique and increase cross-section reinforcement technique, can give full play to the advantage of both, can improve the structure atress condition of roof beam, increase construction period safety, can improve the rigidity and the bearing capacity of girder construction simultaneously again.
3. The utility model discloses rigidity and bearing capacity to reinforced concrete beam structure improve the effect obvious, and the construction operation is more convenient, and the quality is controllable, can extensively be used for various port worker reinforced concrete beam structure to consolidate and reform transform the engineering.
Drawings
FIG. 1 is an elevation view of an embodiment of a beam structure reinforced with external prestressed steel strands;
FIG. 2 is an enlarged view of a portion of A in FIG. 1;
FIG. 3 is a plan view of the beam structure reinforced by external prestressing steel strands;
FIG. 4 is a partially enlarged view of B in FIG. 3;
fig. 5 is a cross-sectional view of an anchor block in the embodiment.
Detailed Description
The technical solution of the present invention is explained in detail below, but the scope of protection of the present invention is not limited to the embodiments.
In order to make the disclosure of the present invention more comprehensible, the following description is further made in conjunction with the accompanying fig. 1 to 5 and the embodiments.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example (b):
now use the utility model provides an external reinforcing apparatus of reinforced concrete roof beam and reinforcement method are applied to Ningbo Beilun international container terminal limited company's approach bridge structure reinforcement engineering for example, and the implementation step is as follows:
referring to fig. 1 to 5, the external reinforcing apparatus for a reinforced concrete beam includes two pre-stress reinforcing units symmetrically disposed on two beam walls of the reinforced concrete beam 1, and the pre-stress reinforcing units are located at lower positions of the beam walls.
The prestress reinforcing unit comprises a steel strand 2, an anchoring block 3, a supporting block 4, an anchoring base plate 5, an anchorage device 6, a jack 7 and a PVC sleeve 8, the anchoring base plate 5 and the PVC sleeve 8 are arranged in the anchoring block 3, the PVC sleeve 8 is arranged in the supporting block 4, the anchoring block 3 and the supporting block 4 are poured by grouting materials, the rigidity and the bearing capacity of a connecting block are guaranteed, the prestress steel strand 2 adopts an unbonded prestress steel strand, the prestress rib is isolated from concrete, the friction loss during tensioning is reduced, and the prestress rib is effectively prevented from being corroded.
The prestressed reinforcement units on the beam wall of the reinforced concrete beam 1 can be arranged in a plurality according to the site construction requirements, and two prestressed reinforcement units are arranged on two beam walls of the reinforced concrete beam 1 in the embodiment. As shown in fig. 2.
The number of the steel strands 2 and the number of the supporting blocks 4 in each prestress reinforcing unit can be set according to the requirements of site construction, in the embodiment, four steel strands 2 and three supporting blocks 4 are arranged in each prestress reinforcing unit. As shown in fig. 2.
A reinforced concrete beam structure reinforcing method for a harbor work is characterized in that external prestress reinforcement and section enlarging reinforcement are combined to improve the structural rigidity and bearing capacity of a beam to be reinforced. The method comprises the steps of firstly fixedly installing and tensioning two or uniformly distributed multiple prestressed steel strands 2 on two sides of a beam structure 1 to be reinforced, then increasing the beam section by using a section enlarging reinforcing method and covering an external prestress reinforcing device. The method comprises the following specific steps:
step 1) beam body pore-forming: a plurality of through holes with uniform intervals are processed on two symmetrical beam walls of the reinforced concrete beam 1 to be reinforced, and roughening treatment is carried out on the concrete at the periphery of the through holes. The hole forming position in the step can be specified in advance, and then a drilling and core-pulling machine is adopted to form holes at the specified node position of the beam body. The pitch between every two adjacent pairs of perforations is equal, and the adjacent pitch is about twice the height of the beam.
Step 2), pouring of an anchoring block: adopting grouting material to pour the node anchoring blocks 3 in two opposite through holes at two ends of the outermost side of the reinforced area on the two symmetrical beam walls, and maintaining; one part of the anchoring block 3 is positioned in the hole, and the other part is positioned outside the hole; an anchorage backing plate 5 and a PVC sleeve 8 are pre-embedded in advance before the anchoring block 3 is poured.
Step 3) pouring a supporting block: pouring the supporting blocks 4 in all the other pairs of through holes on the two symmetrical beam walls by grouting materials, and maintaining; one part of the bearing block 4 is positioned in the hole, and the other part is positioned outside the hole; before the bearing block 4 is poured, a PVC sleeve 8 is pre-embedded in advance. In the step 2 and the step 3, a plurality of PVC sleeves 8 can be pre-buried in one anchoring block 3 and one supporting block 4, the number of the PVC sleeves 8 pre-buried in one anchoring block 3 and one supporting block 4 is equal, and the pre-buried number of the PVC sleeves 8 in one anchoring block 3 and one supporting block 4 is equal to the number of the steel strands 2.
Step 4), anchorage installation: and (3) when the material strength of the anchoring blocks 3 in the step (3) and the material strength of the supporting blocks 4 in the step (4) reach the required strength, mounting an anchorage 6 on an anchorage backing plate 5 in the anchoring blocks 3 on the reinforced concrete beam 1 by using structural adhesive, and maintaining.
Step 5), steel strand blanking: the steel strand 2 penetrates into the anchoring block and the supporting block to reserve the PVC sleeve 8, the steel strand 2 is manually pulled, the exposed lengths of the two ends of the steel strand 2 are consistent, and the steel strand 2 cannot be twisted in a staggered mode.
Step 6) jack installation: jacks 7 are respectively arranged on all the anchorage devices 6 on the reinforced concrete beam 1, and the jacks 7 are penetrated into both ends of the steel strand 2; the center of the anchor 6 is aligned with the center of the PVC sleeve 8, the position of the jack is adjusted, the jack 7, the PVC sleeve 8 and the anchor 6 are positioned on the same axis, and the jack is in contact and close contact with the anchor.
Step 7), prestress tension of the steel strand 2: opening all the jacks 7, pre-tensioning the steel strand 2 to enable the steel strand 2 to reach a stressed state from a relaxed state, and eliminating an elongation value measurement error;
and (3) performing formal tensioning after pre-tensioning, wherein the prestress tensioning is divided into five stages of 0 sigma con to 0.2 sigma con, 0.2 sigma con to 0.4 sigma con, 0.4 sigma con to 0.6 sigma con, 0.6 sigma con to 0.8 sigma con and 0.8 sigma con to 1.0 sigma con, wherein the sigma con represents tensioning control stress, standing for 1-2min after each loading stage is finished, tensioning again after the steel strand 2 is deformed and stabilized, and removing the jack 7 after the tensioning control stress is reached.
Step 8), chiseling beam bottom concrete and removing original corrosion main bars: after the reinforced concrete beam 1 is reinforced by adopting external prestress, an electric hammer is matched with manual work to chisel degraded concrete at the bottom layer of the beam to 20-30 mm behind a main rib, the degraded concrete is cleaned to a compact part, an original corroded main rib is removed, a joint surface is roughened, and edges and corners of the original beam are knocked off; the surfaces of the steel bars and the concrete are cleaned by high-pressure fresh water, and the cement-based migration type steel bar rust-resisting coating is coated twice after the base is cleaned.
Step 9), reinforcing the enlarged section of the beam bottom: and (4) according to the beam structure rechecking calculation, determining the enlarged section size of the reinforced concrete beam 1 and the number of reinforcing steel bars 9. The steel bars are planted at the proper positions of the two sides of the lower part of the beam structure, the template is constructed by adopting a hanging mould, the template is reversely hung on the upper panel through bolts, reinforced concrete materials with certain thickness are additionally arranged on the bottom surface and the side surface of the beam 1, the height and the width of the section of the beam body are increased, the rigidity and the bearing capacity of the beam structure can be effectively improved, and the external prestress device is wrapped by newly added concrete, so that the corrosion prevention problem of the prestress steel strands is effectively solved; and after the concrete is cured, removing the template. The concrete is self-compacting and high-performance C45 concrete.
According to the reinforced concrete beam external reinforcing device and the reinforcing method, after prestress is applied to the steel strands 2, the stress state of the beam structure is improved, the beam 1 has an upward arching effect to a certain degree, a concrete crack at the bottom of the beam structure is closed to a certain degree, and the safety of the beam structure in the reinforcing construction period is greatly improved. The bottom surface and the side surface of the beam 1 are additionally provided with reinforced concrete materials with certain thickness, so that the height and the width of the section of the beam body are increased, the rigidity and the bearing capacity of the beam structure can be effectively improved, and the external prestressed device is wrapped by newly added concrete, so that the corrosion prevention problem of the prestressed steel strands is effectively solved.
In the reinforced concrete beam external reinforcing device and the reinforcing method, the method for improving the structural rigidity and the bearing capacity of the reinforced concrete beam by combining the external prestress with the enlarged cross section is adopted, the advantages of the external prestress reinforcing method and the enlarged cross section reinforcing method can be fully exerted, the existing damage of the structure can be effectively repaired by the external prestress on the damaged beam structure, the safety of the beam in the reinforcing construction period is greatly improved, and the rigidity and the bearing capacity of the original beam structure can be greatly improved by enlarging the cross section.
The utility model discloses the part that does not relate to all is the same with prior art or can adopt prior art to realize.
As mentioned above, although the present invention has been shown and described with reference to certain preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A reinforced concrete beam external reinforcing device is characterized by comprising two prestress reinforcing units which are symmetrically arranged on two beam walls of a reinforced concrete beam (1) to be reinforced,
the prestress reinforcing unit comprises two anchoring blocks (3), at least one supporting block (4), two anchors (6) and at least one steel strand (2),
the two anchoring blocks (3) are arranged at the positions of two ends of a reinforcing area of the beam wall of the reinforced concrete beam (1), and all the supporting blocks (4) are arranged between the two anchoring blocks (3) at equal intervals and arranged on the beam wall of the reinforced concrete beam (1); the two anchoring blocks (3) and all the supporting blocks (4) are tightly fixed with the beam wall of the reinforced concrete beam (1) to ensure the rigidity and the bearing capacity of the anchoring blocks (3) and the supporting blocks (4);
the steel strand (2) penetrates into the two anchoring blocks (3) and all the supporting blocks (4), the two anchors (6) are respectively arranged on the end faces of the outer sides of the two anchoring blocks (3), and the two ends of the steel strand (2) penetrate through the two anchors (6); the steel strand (2) is pre-tensioned on the two anchors (6) through the added jacks (7).
2. The external reinforcement of a reinforced concrete beam according to claim 1, characterized in that PVC sleeves (8) for the penetration of the steel strands (2) are embedded in both the anchoring blocks (3) and all the bearing blocks (4).
3. The external reinforcement of a reinforced concrete beam according to claim 2, characterized in that the anchoring blocks (3) and the supporting blocks (4) are made of grouting material.
4. The external reinforcing device for the reinforced concrete beam according to claim 3, wherein the PVC sleeve (8) is embedded in the anchoring block (3) and the supporting block (4).
5. The external reinforcing device for the reinforced concrete beam according to claim 3, wherein anchor backing plates (5) are embedded into the outer side end faces of the two anchoring blocks (3), and the two anchors (6) are respectively connected with the two anchor backing plates (5).
6. The reinforced concrete beam external reinforcing device in accordance with claim 1, wherein a hole is formed in the beam body by using a core drilling machine on the beam wall of the reinforced concrete beam (1) to be reinforced, an anchoring block (3) and a supporting block (4) are formed by pouring in the hole, and one part of the anchoring block (3) and the supporting block (4) are positioned in the hole and the other part is positioned outside the hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920971708.XU CN210163848U (en) | 2019-06-26 | 2019-06-26 | External reinforcing apparatus of reinforced concrete roof beam |
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| CN201920971708.XU CN210163848U (en) | 2019-06-26 | 2019-06-26 | External reinforcing apparatus of reinforced concrete roof beam |
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| CN210163848U true CN210163848U (en) | 2020-03-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110172951A (en) * | 2019-06-26 | 2019-08-27 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of Reinforced Concrete In Harbor Engineering beam body External prestressed bracing means and reinforcement means |
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2019
- 2019-06-26 CN CN201920971708.XU patent/CN210163848U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110172951A (en) * | 2019-06-26 | 2019-08-27 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of Reinforced Concrete In Harbor Engineering beam body External prestressed bracing means and reinforcement means |
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