CN113668326B - Cast-in-place prestressed concrete pavement structure and construction method thereof - Google Patents
Cast-in-place prestressed concrete pavement structure and construction method thereof Download PDFInfo
- Publication number
- CN113668326B CN113668326B CN202110921861.3A CN202110921861A CN113668326B CN 113668326 B CN113668326 B CN 113668326B CN 202110921861 A CN202110921861 A CN 202110921861A CN 113668326 B CN113668326 B CN 113668326B
- Authority
- CN
- China
- Prior art keywords
- lane
- transverse steel
- steel bar
- concrete
- cast
- 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.)
- Active
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/16—Reinforcements
- E01C11/18—Reinforcements for cement concrete pavings
- E01C11/20—Reinforcements for cement concrete pavings for prestressed concrete pavings
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
- E01C7/16—Prestressed concrete paving
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a cast-in-place prestressed concrete pavement structure, which comprises a lane pre-cast strip, a curb post-cast strip and an inter-lane post-cast strip which are all laid on a roadbed, wherein the lane pre-cast strip comprises transverse steel bars and longitudinal steel bars which are arranged at intervals along the pavement structure, and concrete plates which are integrally connected with the steel bars in a pouring way; the transverse end part is inserted into the curb post-cast strip or the lane post-cast strip, the part of the transverse steel bar, which is positioned in the lane pre-cast strip, is prestressed, and the part of the transverse steel bar, which is positioned in the curb post-cast strip and the lane post-cast strip, is not prestressed. The invention also discloses a construction method of the prestressed concrete pavement structure. The beneficial effects of the invention are as follows: the invention adopts prestressed reinforced concrete, utilizes the larger rigidity and crack resistance of the prestressed concrete right below the lane, can prevent the pavement from cracking and prolong the service life of the pavement.
Description
Technical Field
The invention relates to a pavement construction technology, in particular to a cast-in-place prestressed concrete pavement structure and a construction method thereof.
Background
Improving the service life of pavements is a long-term pursuit of the road traffic industry. However, because the concrete has the characteristics of strong compressive capacity and poor tensile capacity, the concrete pavement is easy to crack under the conditions of temperature and wheel load. When the concrete pavement cracks, rainwater on the pavement surface can invade the interior of the pavement along the cracks, so that the reinforcing steel bars are corroded, the roadbed is softened and damaged, and the pavement further cracks.
In order to avoid the problems, the traditional treatment method mainly has two aspects, namely, the reinforcement ratio of the concrete pavement is increased, for example, a double-layer reinforcement concrete pavement structure is adopted; and secondly, the thickness of the roadbed and the roadbed poured by concrete are increased so as to improve the quality of the roadbed. Although the traditional method reduces the generation of cracks on the concrete pavement to a certain extent and prolongs the service life of the pavement, the economic cost is extremely high, and the method is difficult to widely popularize and popularize except a few main roads.
Disclosure of Invention
The invention aims to provide a cast-in-place prestressed concrete pavement structure capable of reducing pavement cracking and prolonging the service life of a road and a construction method thereof, aiming at the defects of the prior art.
The technical scheme adopted by the invention is as follows: a cast-in-place prestressed concrete pavement structure comprises a lane first-pouring belt, a curb second-pouring belt and an inter-lane second-pouring belt which are all laid on a roadbed, wherein the curb second-pouring belt is positioned on the side part of the lane first-pouring belt, the inter-lane second-pouring belt is positioned on an inter-lane dividing line of the whole pavement structure, and both sides of the inter-lane second-pouring belt are lane first-pouring belts; the lane cast-in-place strip comprises transverse steel bars and longitudinal steel bars which are arranged at intervals along a pavement structure, and the steel bars are connected with an integrated concrete slab in a pouring way; the end parts of the transverse steel bars are inserted into the curb post-cast strip or the inter-lane post-cast strip, and prestress is applied to the parts of the transverse steel bars, which are positioned in the lane pre-cast strip.
According to the scheme, the curb post-cast strip and the post-cast strip between lanes are respectively cast by ECC concrete.
According to the scheme, the transverse steel bars are sleeved in the corrugated pipes, the corrugated pipes are arranged in the length direction along the width direction of the lane cast-in-place strip, and the end parts of the transverse steel bars extend out of the corrugated pipes; and grouting the gap between the corrugated pipe and the transverse steel bar.
According to the scheme, the transverse steel bars of the first cast strips of the adjacent lanes correspond to each other in position and are connected at the end parts.
The invention also provides a construction method of the cast-in-place prestressed concrete pavement structure, which comprises the following steps:
step one, flattening and rolling a roadbed;
step two, binding longitudinal and transverse steel bars, erecting a lane first-pouring belt template, and pouring and maintaining the lane first-pouring belt concrete;
thirdly, removing a lane first-poured-belt template, tensioning a transverse steel bar by using a jack device, and grouting the inner pore of the corrugated pipe;
step four, maintaining the grouting material, and dismantling the jack device;
welding transverse steel bars at the same transverse position of the first-poured strip of each lane, pouring and maintaining a curb post-poured strip and an inter-lane post-poured strip, and connecting the first-poured strips of each workshop lane into a whole;
and step six, paving a pavement layer.
According to above-mentioned scheme, in step two, after the transverse reinforcement arranges the completion, adopt sponge or rubber buffer to fill corrugated pipe tip, block up the bellows when preventing concrete placement.
According to the scheme, the specific method of the step three comprises the following steps:
1) Cleaning a rubber plug or a sponge block used for sealing at the end part of the corrugated pipe to ensure that the transverse steel bar can freely slide in the corrugated steel pore channel;
2) Cleaning the roots of the transverse steel bars and concrete around the end parts of the corrugated pipes, and polishing and flattening;
3) Adjusting the position of the transverse steel bar, wherein the overlapping length of the transverse steel bars at the same transverse position of the adjacent lanes is 20-25 cm;
4) Arranging a jack device to stretch the transverse steel bar so that the stretching stress of the transverse steel bar reaches the design requirement;
5) And grouting the corrugated pipe, wherein grouting is started from one end of the corrugated pipe until grouting material flows out from the other end of the corrugated pipe and has no bubbles.
According to the scheme, the jack device comprises a supporting base plate, a hollow jack and an anchor head structure; the support base plate is tightly attached to the side part of the concrete slab of the roadway firstly-poured belt, and is provided with a through hole and a grouting hole for corrugated pipe grouting; the jack is arranged on the supporting base plate, and the telescopic direction of the jack is consistent with the axial direction of the transverse steel bar; the end part of the transverse steel bar nested in the corrugated pipe extends out of the through hole and is connected with the driving end of the jack through the anchor head structure, and the tensioning of the transverse steel bar is realized when the driving end of the jack stretches.
According to the scheme, the jack comprises a hydraulic cylinder, a hydraulic rod and a limiting plate, the bottom of the hydraulic cylinder is fixed on the supporting base plate, and the hydraulic cylinder is provided with an oil cavity and an oil filler hole communicated with the oil cavity; the hydraulic rod is hollow, and the transverse steel bar penetrates through the hydraulic rod; one end of the hydraulic rod is hermetically connected in the oil cavity, and the hydraulic rod can slide along the inner wall of the oil cavity; the other end of the hydraulic rod is connected with the transverse steel bar through an anchor head structure; a limiting plate for limiting the hydraulic rod to slide out is arranged on the outer side of the oil cavity, and the limiting plate is connected with the hydraulic cylinder through a bolt; the anchor head clamping piece is arranged in the anchor head clamping ring and used for clamping the transverse steel bar; the inner side surface of the anchor head snap ring is connected with the outer end part of the hydraulic rod.
According to the scheme, the tension control stress of the transverse steel bar is 250-320 Mpa.
The invention has the beneficial effects that:
1. the road surface atress is more reasonable: the pavement structure of the invention is composed of prestressed concrete pre-cast strips and common reinforced concrete post-cast strips in an alternating manner. Compared with a common reinforced concrete structure, the prestressed concrete slab positioned below the wheel track belt has the characteristics of stronger crack resistance and bearing capacity; compared with a full-section prestressed concrete structure, the prestressed concrete structure is simpler in prestressed construction, and meanwhile, as the prestress is distributed according to the lane, the prestress loss caused by ground friction is smaller, and the structural stress is more reasonable.
2. The rigid-flexible combination ensures that the road surface is better stressed: according to the invention, the prestressed reinforced concrete and the ECC concrete are alternately used, so that on one hand, the higher rigidity and crack resistance of the prestressed concrete right below the lane are utilized, and meanwhile, the ECC concrete has good deformation capability (the limit strain is 200-300 times of the concrete) and can be used as a post-cast strip to prevent the cracking of the post-cast strip pavement, so that the pavement integrally has good deformation and crack resistance.
3. The road surface is closely contacted with the ground substrate, and the phenomenon of void is avoided: the cast-in-place prestressed concrete slab is in close contact with the road surface, has no phenomenon of void, can uniformly transmit the wheel load to the foundation in service, and prolongs the service life of the road surface.
4. The road slab has stronger load bearing capacity: due to the action of the prestress, the concrete is in a transverse compression state, and compared with a non-prestressed concrete pavement, the anti-shearing capacity of the concrete is stronger, so that the concrete can bear larger load.
5. The waterproof capability is stronger, and the durability is better: because the concrete is in an initial pressed state, even if cracks appear under the action of load in the service process, the concrete can be closed quickly under the action of load, so that rainwater is prevented from flowing into the cracks to cause corrosion of reinforcing steel bars and softening of foundations, and the pavement provided by the invention has longer service life and better durability.
6. The construction is simple, easily operation: compared with the traditional cast-in-place pavement construction process, the construction process has the main difficulty of stretching the transverse steel bars, but the construction process is less in difficulty and easy to construct on site by matching with the hollow stretching jack.
7. The manufacturing cost is lower: compared with the traditional concrete pavement, the prestressed reinforcement tensioning construction cost is increased, but the prestressed reinforcement tensioning construction cost is reduced to a certain extent compared with the common reinforced concrete pavement structure due to the adoption of the prestressed structure, and meanwhile, the thickness of the concrete slab can be reduced under the same condition, so that the consumption of the concrete is saved, and the comprehensive cost is basically equal to or lower than that of the traditional reinforced concrete pavement structure.
Drawings
FIG. 1 is a plan view of the structure of an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of the road surface tension in this embodiment.
Fig. 3 is a partial schematic view of a tendon tension in this embodiment.
Fig. 4 is a first structural view of the jack device in this embodiment.
Fig. 5 is a second structural view of the jack device in this embodiment.
Fig. 6 is a schematic cross-sectional view of the final pavement in this embodiment.
Wherein: the method comprises the following steps of 1-lane first pouring zone, 2-transverse steel bar, 21-corrugated pipe, 22-transverse steel bar overlapping section, 23-transverse steel bar extending section, 3-longitudinal steel bar, 4-curb later pouring zone, 5-inter-lane later pouring zone, 6-roadbed, 7-anchor head structure, 71-anchor head clamping piece, 72-anchor head clamping ring, 8-jack, 81-hydraulic rod, 82-hydraulic cylinder, 83-oil injection hole, 84-hydraulic oil, 85-sealing ring, 86-limiting plate, 87-bolt, 9-supporting cushion plate, 91-grouting hole and 92-rubber plug.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
The cast-in-place prestressed concrete pavement structure shown in fig. 1 comprises a lane first-pouring zone 1, a curb second-pouring zone 4 and an inter-lane second-pouring zone 5 which are respectively paved on a roadbed 6, wherein the curb second-pouring zone 4 is positioned on the side part of the lane first-pouring zone 1, the inter-lane second-pouring zone 5 is positioned on an inter-lane dividing line of the overall pavement structure, and both sides of the inter-lane second-pouring zone 5 are the lane first-pouring zones 1; the lane pre-cast strip 1 comprises transverse steel bars 2 and longitudinal steel bars which are arranged at intervals along a pavement structure, and concrete slabs which are integrally connected with the steel bars in a pouring manner; the end parts of the transverse steel bars 2 are inserted into the curb post-cast strip 4 or the inter-lane post-cast strip 5, the parts of the transverse steel bars 2, which are positioned in the lane pre-cast strip 1, are prestressed, and the parts of the transverse steel bars 2, which are positioned in the curb post-cast strip 4 and the inter-lane post-cast strip 5, are not prestressed. In this embodiment, the concrete slab is a prestressed concrete slab because the transverse reinforcing steel bars 2 are prestressed.
Preferably, the curb post-cast strip 4 and the inter-lane post-cast strip 5 are both respectively cast by using ECC concrete (Engineered cement Composite, fiber reinforced cement-based Composite), and the ECC concrete has high deformability.
Preferably, the transverse steel bars 2 are sleeved in the corrugated pipe 21, the corrugated pipe 21 is arranged along the width direction of the lane precast strip 1 in a full-length mode, and the end portions of the transverse steel bars 2 extend out of the corrugated pipe 21; the gap between the corrugated pipe 21 and the transverse reinforcing steel bar 2 is grouted.
Preferably, the transverse steel bars 2 of the pre-cast strips 1 of the adjacent lanes correspond in position and are connected at the ends.
In the invention, the transverse steel bar 2 is a twisted steel bar.
As shown in fig. 2, the construction method of the cast-in-place pavement concrete pavement structure comprises the following steps:
step one, leveling and rolling the roadbed 6: and (4) leveling and compacting the roadbed 6 according to the design requirement, so that the elevation and the compaction degree of the roadbed 6 reach the design requirement.
And step two, binding longitudinal steel bars and transverse steel bars 2, erecting a template of the lane first-pouring belt 1, and pouring and maintaining concrete of the lane first-pouring belt 1. The width of the lane pre-cast strip 1 is 3.2-3.6 m, and the width of the lane pre-cast strip 1 is 3.5m in the embodiment. When the transverse steel bars 2 are erected, the positions of the transverse steel bars 2 positioned on different lanes correspond to each other so that the transverse steel bars 2 of different lanes are connected together; meanwhile, after the transverse steel bars 2 are arranged, sponge or rubber plugs are adopted to fill gaps between the transverse steel bars 2 and the corrugated pipes 21 at the end parts of the corrugated pipes 21, so that the corrugated pipes 21 are prevented from being blocked when concrete is poured.
The arrangement parameters of the longitudinal steel bars and the transverse steel bars 2 are as follows: the longitudinal steel bars are continuously arranged at intervals along the length direction of the pavement structure, and the distance is 15-30 cm; the distance between the longitudinal steel bars in the embodiment is 20cm. The longitudinal steel bars are arranged on the central plane of the thickness of the concrete slab of the lane pre-cast strip 1, and the longitudinal steel bars are erected on the transverse steel bars 2. The arrangement distance of the transverse steel bars 2 is 10-20 cm, and 20cm in the embodiment; two ends of the transverse steel bar 2 respectively penetrate out of the corrugated pipes 2120-30 cm, in the embodiment, 30cm; the transverse reinforcing steel bars 2 are nested in the corrugated pipes 21, and the length of the corrugated pipes 21 is equal to the width of the precast concrete slab.
And step three, removing the template of the lane first-poured band 1, tensioning the transverse steel bars 2 by using a jack device, and grouting the inner pore channels of the corrugated pipe 21.
In the invention, the third step mainly involves the tensioning of the transverse steel bar 2, as shown in fig. 3 to 5, the main construction process and parameters are set as follows:
1) The end part of the cleaning corrugated pipe 21 is used for sealing the rubber plug or the sponge block, so that the transverse steel bar 2 can freely slide in the corrugated steel hole channel, and the subsequent stretching of the transverse steel bar 2 is facilitated.
2) The root of the transverse steel bar 2 and the concrete around the end part of the corrugated pipe 21 are cleaned, and the concrete is polished to be smooth, so that the jack device is convenient to arrange.
3) Adjusting the position of the transverse steel bar 2, wherein the overlapping length of the transverse steel bars 2 at the same transverse position of the adjacent lanes is 20-25 cm, preferably 20cm; for the curb-side lateral reinforcing bars 2, the end portions thereof (i.e., the overhanging sections 23) are extended by 30cm.
4) And arranging a jack device to stretch the transverse steel bar 2 so that the stretching stress reaches a stretching control stress range. In the invention, the tension control stress of the transverse steel bar 2 is 250-320 Mpa.
5) And grouting the corrugated pipe 21, and plugging the grouting hole after grouting is finished. Grouting is started from one end of the corrugated pipe 21 until the grouting material flows out from the other end without air bubbles.
In the invention, the adopted grouting material is quick-setting high-strength mortar, the setting time is less than 48 hours, and the effect is mainly three, namely, the prestress of the transverse steel bar 2 is transferred to the concrete of the pre-cast strip after the jack device is unloaded; secondly, the transverse steel bars 2 are protected, and the loss of prestress caused by corrosion of the transverse steel bars 2 is prevented; thirdly, the construction progress is accelerated by adopting quick-setting mortar.
In the invention, the jack device comprises a supporting base plate 9, a hollow jack 8 and an anchor head structure 7; the support backing plate 9 is tightly attached to the side part of the concrete slab of the lane pre-cast strip 1, and a through hole is formed in the center of the support backing plate 9; the jack 8 is arranged on the supporting base plate 9, and the telescopic direction of the jack 8 is consistent with the axial direction of the transverse steel bar 2; the end part of the transverse steel bar 2 nested in the corrugated pipe 21 extends out of the through hole and is connected with the driving end of the jack 8 through the anchor head structure 7, and the stretching of the transverse steel bar 2 is realized when the driving end of the jack 8 stretches. In this embodiment, the rubber plug 92 is filled in the gap between the transverse steel bar 2 and the through hole; the support backing plate 9 is provided with a grouting hole 91 for grouting the corrugated pipe 21.
Preferably, the jack 8 comprises a hydraulic cylinder 82, a hydraulic rod 81 and a limit plate 86, the bottom of the hydraulic cylinder 82 is fixed on the support cushion plate 9, and the hydraulic cylinder 82 is provided with an oil cavity and an oil filling hole 83 communicated with the oil cavity; the hydraulic rod 81 is hollow, and the transverse steel bar 2 penetrates through the hydraulic rod 81; one end of the hydraulic rod 81 is connected in the oil cavity in a sealing mode (the hydraulic rod 81 and the inner wall of the oil cavity are sealed through a sealing ring 85), and the hydraulic rod 81 can slide along the inner wall of the oil cavity; the other end of the hydraulic rod 81 is connected with the transverse steel bar 2 through an anchor head structure 7. And a limiting plate 86 for limiting the hydraulic rod 81 to slide out is arranged on the outer side of the oil cavity, and the limiting plate 86 is connected with the hydraulic cylinder 82 through a bolt 87.
Preferably, the anchor head structure 7 comprises an anchor head snap ring 72 and a plurality of anchor head clamping pieces 71, and the anchor head clamping pieces 71 are arranged in the anchor head snap ring 72 and used for clamping the transverse steel bars 2; the inner side surface of the anchor head snap ring 72 is connected with the outer end part of the hydraulic rod 81.
The jack device has the working principle that: when hydraulic oil 84 is injected into or extracted from the oil cavity, the pressure in the oil cavity changes to drive the hydraulic rod 81 to move, and the anchor head structure 7 connected with the hydraulic rod 81 drives the transverse steel bar 2 to move so as to realize tensioning.
And step four, maintaining the grouting material and dismantling the jack device. The jack device dismantling process is as follows:
1) The jack 8 is decompressed and retracted, and the anchor head and the jack 8 are sequentially dismantled;
2) And removing the backing plate and the rubber block, and preliminarily cleaning the side face of the concrete slab of the lane initial casting belt 1.
And step five, welding the transverse steel bars 2 at the same transverse position of the first-cast strip 1 of each lane, pouring and maintaining a curb post-cast strip 4 and an inter-lane post-cast strip 5, and connecting the first-cast strips of the inter-lane into a whole as shown in fig. 6. The specific construction method comprises the following steps:
1) Performing chiseling treatment on the side surface of the concrete slab of the lane initial pouring belt 1;
2) Welding the exposed transverse steel bars 2 of the first casting belts 1 of the adjacent lanes;
3) The ECC concrete is adopted to cast a road edge post-cast strip 4 and an inter-lane post-cast strip 5, wherein the width of the inter-lane post-cast strip 5 is 30-40 cm, and 40cm is adopted in the embodiment; the width of the curb post-cast strip 4 is 20-30 cm, and 30cm in the embodiment.
And step six, paving a pavement layer.
It should be noted that, although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications, equivalents, improvements and the like can be made in the embodiments or some of the features of the embodiments without departing from the spirit and the principle of the present invention.
Claims (7)
1. A cast-in-place prestressed concrete pavement structure is characterized by comprising a lane first-pouring belt, a curb second-pouring belt and an inter-lane second-pouring belt which are all laid on a roadbed, wherein the curb second-pouring belt is positioned on the side part of the lane first-pouring belt, the inter-lane second-pouring belt is positioned on an inter-lane dividing line of the whole pavement structure, and both sides of the inter-lane second-pouring belt are lane first-pouring belts; the lane cast-in-place strip comprises transverse steel bars and longitudinal steel bars which are arranged at intervals along a pavement structure, and the steel bars are connected with an integrated concrete slab in a pouring way; the end part of the transverse steel bar is inserted into a curb post-cast strip or an inter-lane post-cast strip, and the part of the transverse steel bar, which is positioned in a lane pre-cast strip, is applied with prestress; the curb post-cast strip and the post-cast strip between the lanes are respectively cast by ECC concrete; the transverse steel bars are sleeved in the corrugated pipes, the corrugated pipes are arranged along the width direction of the lane pre-cast strip in a full-length mode, and the end portions of the transverse steel bars extend out of the corrugated pipes; and grouting the gap between the corrugated pipe and the transverse steel bar.
2. A pavement structure according to claim 1, characterized in that the transverse reinforcement of the pre-cast strip of adjacent lanes is positioned correspondingly and end-connected.
3. A construction method of a cast-in-situ prestressed concrete pavement structure is characterized by comprising the following steps:
step one, leveling and rolling a roadbed;
step two, binding longitudinal and transverse steel bars, erecting a lane early-pouring belt template, and pouring and maintaining lane early-pouring belt concrete;
thirdly, removing a lane first-poured strip template, tensioning the transverse steel bars by using a jack device, and grouting the inner pore of the corrugated pipe;
step four, maintaining the grouting material, and dismantling the jack device;
welding transverse steel bars at the same transverse position of the first-poured strip of each lane, pouring and maintaining a curb post-poured strip and an inter-lane post-poured strip, and connecting the first-poured strips of each workshop lane into a whole;
step six, paving a pavement layer;
the concrete method of the third step is as follows:
1) Cleaning a rubber plug or a sponge block used for sealing at the end part of the corrugated pipe to ensure that the transverse steel bar can freely slide in the corrugated steel duct;
2) Cleaning the roots of the transverse steel bars and concrete around the end parts of the corrugated pipes, and polishing and flattening;
3) Adjusting the position of the transverse steel bar, wherein the overlapping length of the transverse steel bars at the same transverse position of the adjacent lanes is 20-25 cm;
4) Arranging a jack device to stretch the transverse steel bar so that the stretching stress of the transverse steel bar reaches the design requirement;
5) And grouting the corrugated pipe, wherein grouting is started from one end of the corrugated pipe until grouting material flows out from the other end of the corrugated pipe and has no bubbles.
4. The construction method according to claim 3, wherein in the second step, after the transverse reinforcing bars are arranged, the ends of the corrugated pipes are filled with sponge or rubber plugs to prevent the corrugated pipes from being blocked during the concrete pouring.
5. The construction method according to claim 3, wherein the jack device comprises a support mat, a hollow jack and an anchor head structure; the support base plate is tightly attached to the side part of the concrete slab of the roadway firstly-poured belt, and is provided with a through hole and a grouting hole for corrugated pipe grouting; the jack is arranged on the support base plate, and the telescopic direction of the jack is consistent with the axial direction of the transverse steel bar; the end part of the transverse steel bar nested in the corrugated pipe extends out of the through hole and is connected with the driving end of the jack through the anchor head structure, and the stretching of the transverse steel bar is realized when the driving end of the jack stretches.
6. The construction method according to claim 5, wherein the jack comprises a hydraulic cylinder, a hydraulic rod and a limiting plate, the bottom of the hydraulic cylinder is fixed on the support base plate, and the hydraulic cylinder is provided with an oil cavity and an oil filling hole communicated with the oil cavity; the hydraulic rod is hollow, and the transverse steel bar penetrates through the hydraulic rod; one end of the hydraulic rod is hermetically connected in the oil cavity, and the hydraulic rod can slide along the inner wall of the oil cavity; the other end of the hydraulic rod is connected with the transverse steel bar through an anchor head structure; a limiting plate for limiting the hydraulic rod to slide out is arranged on the outer side of the oil cavity, and the limiting plate is connected with the hydraulic cylinder through a bolt; the anchor head clamping piece is arranged in the anchor head clamping ring and used for clamping the transverse steel bar; the inner side surface of the anchor head snap ring is connected with the outer end part of the hydraulic rod.
7. The construction method according to claim 3, wherein the tension control stress of the lateral reinforcing bars is 250 to 320Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110921861.3A CN113668326B (en) | 2021-08-12 | 2021-08-12 | Cast-in-place prestressed concrete pavement structure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110921861.3A CN113668326B (en) | 2021-08-12 | 2021-08-12 | Cast-in-place prestressed concrete pavement structure and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113668326A CN113668326A (en) | 2021-11-19 |
| CN113668326B true CN113668326B (en) | 2023-04-07 |
Family
ID=78542411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110921861.3A Active CN113668326B (en) | 2021-08-12 | 2021-08-12 | Cast-in-place prestressed concrete pavement structure and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113668326B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2537616A1 (en) * | 1975-08-23 | 1977-03-03 | Johann Jacob Dr Ing Rieve | PRE-TENSED ROAD CEILINGS |
| CN2289830Y (en) * | 1997-03-14 | 1998-09-02 | 中国科学院武汉岩土力学研究所 | Sand consolidation anchor head prestressed rockbolt |
| KR100916973B1 (en) * | 2009-04-08 | 2009-09-14 | (주)삼우아이엠씨 | Construction method of prestressed concrete pavement and its structure |
| CN103255720B (en) * | 2013-05-28 | 2015-07-22 | 桂林理工大学 | Method for assembled integral type reinforced concrete slab bridge |
| CN105862538B (en) * | 2016-05-31 | 2018-05-15 | 沈阳建筑大学 | The oblique bond-retarded prestressed concrete pavement structure of assembled |
| CN108589525B (en) * | 2018-04-23 | 2020-04-17 | 宁波大学 | Bidirectional prestress bridge deck continuous device and prefabricating method and transverse connection method thereof |
| CN110004791A (en) * | 2019-04-19 | 2019-07-12 | 河北建设集团股份有限公司 | A kind of prestressing without bondn assembled road and its construction method |
-
2021
- 2021-08-12 CN CN202110921861.3A patent/CN113668326B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113668326A (en) | 2021-11-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107740339B (en) | Rigidity-enhanced bridge head structure for managing bridge head jumping of operation road and construction method | |
| CN109339828B (en) | Tunnel prestress inverted arch structure and construction method thereof | |
| KR100687211B1 (en) | Method of paving road using precast concrete panel | |
| CN105862538A (en) | Assembling type inclined slow-adhesion pre-stressed concrete road surface structure | |
| CN207267954U (en) | A kind of prefabricated PC construction refuse regenerated aggregate road | |
| CN105714635A (en) | Concrete drainage road surface and construction and repairing method thereof | |
| CN103485281A (en) | Construction method of assembly-type external transverse prestressed hollow plate bridge | |
| CN107237232B (en) | high-durability cement concrete pavement expansion joint structure and construction method thereof | |
| CN110700121B (en) | Road and bridge crack repairing and fixing structure | |
| CN111535108A (en) | High-strength permanent pavement and construction method thereof | |
| CN113668326B (en) | Cast-in-place prestressed concrete pavement structure and construction method thereof | |
| CN110195392B (en) | Prestressed concrete pavement suitable for flat curve line section and construction method thereof | |
| CN114960331A (en) | Rigid-flexible composite pavement structure and construction method thereof | |
| CN110820466A (en) | Quick repairing method for cement concrete pavement | |
| CN105970838B (en) | Deck Arch Bridges vault filler unloads and reinforced construction method and application | |
| CN210216146U (en) | Precast concrete bridge deck pavement block of short T roof beam of assembled | |
| CN202849886U (en) | Concrete slab road surface structure | |
| CN113774746A (en) | Pretensioned prestressed concrete assembled pavement and preparation method thereof | |
| CN218478979U (en) | Seamless airport pavement structure and seamless reconstruction structure of existing airport pavement | |
| JP4010388B2 (en) | High-strength reinforced concrete precast plate | |
| CN114908632B (en) | Method for repairing and improving road surface bearing capacity | |
| CN112281561B (en) | Heavy-load long-service-life highway structure and construction method | |
| CN219117865U (en) | Pavement structure of municipal works pavement precast block | |
| CN216275079U (en) | Pretensioning prestressed concrete assembled pavement | |
| CN218322165U (en) | Steel construction combination beam type temporary pavement |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |