CN112709136B - Grouting device for prestress tensioning and grouting method thereof - Google Patents
Grouting device for prestress tensioning and grouting method thereof Download PDFInfo
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- CN112709136B CN112709136B CN202011328713.2A CN202011328713A CN112709136B CN 112709136 B CN112709136 B CN 112709136B CN 202011328713 A CN202011328713 A CN 202011328713A CN 112709136 B CN112709136 B CN 112709136B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention discloses a grouting device for prestress tensioning and a grouting method thereof, wherein the grouting device comprises an anchor backing plate, a grouting hole is formed in the anchor backing plate, and the grouting hole is connected with a grouting device; the grouting device comprises a first pipeline, a second pipeline, an exhaust pipeline, a grouting pipeline and a third pipeline, one end of the first pipeline is connected with the exhaust pipeline, the other end of the first pipeline is detachably connected with the grouting hole, the second pipeline penetrates through the first pipeline and the grouting hole, one end of the second pipeline is connected with the grouting pipeline, the other end of the second pipeline is detachably connected with the third pipeline, the third pipeline is located in the prestressed hole, and valve control connection is arranged on the exhaust pipeline and the grouting pipeline respectively. The grouting device can ensure the connection compactness, can discharge air in the prestressed duct, improves the air discharge rate, enables the grouting liquid and the prestressed tendons to be tightly filled, effectively improves the grouting compactness of the prestressed duct, ensures the grouting quality and obviously improves the integral durability of the prestressed structure of the bridge.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a grouting device for prestress tensioning and a grouting method thereof.
Background
In the bridge construction process, effective prestress needs to be built to ensure the reliability, the service life and the like of the bridge. The prestressed construction can be divided into two steps of prestressed tensioning construction and prestressed duct grouting construction; firstly, the tensioning precision is controlled through a prestress tensioning system, and then grouting is carried out in a prestress pore channel to wrap a prestressed tendon, so that the effective transmission of prestress is ensured. Because the prestressed duct is pre-buried, the prestressed duct grouting belongs to a hidden process, and whether air in the prestressed duct is completely discharged or not can not be visually observed in the grouting process and at the end of grouting. A large number of surveys show that the potential quality hazards of prestressed bridges mainly come from the prestressed tensioning construction process, grouting is not full due to the lack of an effective grouting method and the lack of standardization, air in a prestressed duct cannot be completely discharged, prestressed tendons are corroded due to holes formed by the air which is not discharged, the grouting liquid has low compactness, the integral engineering quality of prestressed concrete is difficult to ensure, the grouting quality after construction is poor, and finally the forming quality of the prestressed tendons is poor.
In order to ensure the grouting quality, in the prestress tensioning construction, the grouting of a prestress duct is generally performed by arranging exhaust holes, after the anchor head is sealed, the prepared grouting material is pressed into the prestress duct at the grouting end of the prestress duct, the air in the duct is discharged through the exhaust holes which are arranged in advance at the other end until the slurry flows out from the exhaust holes, and the air-discharging grouting operation is completed. The air in the pore channel is difficult to be completely discharged by adopting the mode, the air discharge rate is low, the air discharge mode is greatly influenced by human subjective factors, and the quality traceability is poor. In addition, vacuum grouting is proposed, but in the actual construction process, the vacuum in the prestressed pipeline is difficult to ensure, and grouting quality is still difficult to ensure under the condition that grouting is not full in many pipelines. Therefore, there is an urgent need for a grouting method capable of increasing the air discharge rate in the prestressed duct to ensure grouting compactness and grouting quality.
Disclosure of Invention
The invention aims to solve the problem of poor grouting quality caused by low air discharge rate in a prestressed duct in grouting construction, and provides a grouting device for prestressed tensioning and a grouting method thereof.
In order to achieve the above purpose, the invention provides the following technical scheme:
a grouting device for prestress tensioning comprises an anchor backing plate, wherein the anchor backing plate is used for being connected with a prestress pore channel, a grouting hole is formed in the anchor backing plate and communicated with the prestress pore channel, and the grouting hole is connected with a grouting device; the grouting device comprises a first pipeline, a second pipeline, an exhaust pipeline, a grouting pipeline and a third pipeline, wherein one end of the first pipeline is connected with the exhaust pipeline, the other end of the first pipeline is detachably connected with the grouting hole, the second pipeline penetrates through the first pipeline and the grouting hole, one end of the second pipeline is connected with the grouting pipeline, the other end of the second pipeline is detachably connected with the third pipeline, the third pipeline is located in the prestressed hole, and valves are respectively arranged on the exhaust pipeline and the grouting pipeline.
The grouting device is characterized in that a grouting hole is formed in an anchor backing plate and is connected with a grouting device, one end of a second pipeline in the grouting device is connected with a grouting pipeline, the other end of the second pipeline is connected with a third pipeline, the grouting pipeline can be externally connected with grouting equipment, and grouting liquid is pressed into a prestressed pore channel sequentially through the grouting pipeline, the second pipeline and the third pipeline to realize grouting into the prestressed pore channel; a gap exists between the second pipeline and the first pipeline and between the second pipeline and the grouting hole, one end of the first pipeline in the grouting device is connected with the exhaust pipeline, the other end of the first pipeline is connected with the grouting hole, communication with the prestressed duct is achieved, and in the grouting process, air in the duct can be discharged through the grouting hole, the first pipeline and the exhaust pipeline. The grouting device can ensure the connection compactness, can exhaust air in the prestressed duct, improves the air exhaust rate, enables the grouting liquid and the prestressed tendons to be tightly filled, effectively improves the grouting compactness of the prestressed duct, ensures the grouting quality and obviously improves the integral durability of the prestressed structure of the bridge. Meanwhile, the grouting device is simple in structure, convenient to install and construct and capable of effectively improving grouting efficiency of the prestressed duct.
Further, the inner diameter of the first pipeline is 6-30mm larger than that of the second pipeline. In the grouting process, the second pipeline penetrates through the first pipeline and the grouting hole, a gap exists between the second pipeline and the grouting hole, air in the prestressed hole can be discharged from the exhaust pipeline through the gap between the first pipeline and the second pipeline, and the larger the difference between the inner diameters of the first pipeline and the second pipeline is, the quick discharge of the air is facilitated.
Furthermore, first pipeline one end with exhaust duct passes through the screw thread and can dismantle the connection, second pipeline one end with slip casting pipeline passes through the screw thread and can dismantle the connection.
Further, the second pipeline is including dismantling fourth pipeline and the fifth pipeline of connection, the fourth pipeline is kept away from the one end of fifth pipeline with slip casting pipe connection, the fifth pipeline is kept away from the one end of fourth pipeline with the connection can be dismantled to the third pipeline.
Further, the fifth pipeline is connected with the third pipeline through threads, and the inner diameter of the fifth pipeline is the same as that of the third pipeline.
Further, the fourth pipeline is a steel pipe, and the fifth pipeline is a PE hose. Furthermore, a pot head that the fifth pipeline is kept away from the fourth pipeline is established on the third pipeline, and the junction passes through the fixation clamp to be fixed, the internal diameter of fifth pipeline is 1-4mm greater than the internal diameter of third pipeline, the use of fixation clamp can guarantee the compactness of fifth pipeline and third pipeline junction avoids the junction to overflow thick liquid.
Furthermore, the mud jacking hole is L-shaped, one end of the mud jacking hole is connected with the side wall of the anchor backing plate, the fifth pipeline penetrates through the mud jacking hole and is detachably connected with the third pipeline, and the fifth pipeline is Z-shaped.
Furthermore, the third pipeline is positioned in the prestressed duct, grouting liquid is injected into the prestressed duct from the third pipeline through the grouting device, the length of the third pipeline is b, and the length of the prestressed duct is b 1 ，0.6b 1 ≤b<b 1 。
The invention also provides a grouting method based on the grouting device, which comprises the following steps:
s1, after the construction of the prestressed duct is finished, installing the anchor backing plate, installing prestressed tendons, installing the third duct and performing prestressed tensioning;
s2, installing the grouting device, connecting the grouting pipeline with grouting equipment, opening valves on the exhaust pipeline and the grouting pipeline, and performing grouting construction;
and S3, when the pressure grout in the exhaust pipeline is discharged, closing a valve of the exhaust pipeline, then closing a valve of the grouting pipeline to stop grouting, and completing the grouting construction.
Further, when grouting is carried out on the prestressed duct in the horizontal direction, the third pipeline is installed right above the prestressed duct and close to the upper inner top wall of the prestressed duct; when the anchor backing plate is installed, the grouting hole is higher than the prestressed duct, so that grouting liquid can be filled in the whole prestressed duct. According to the grouting method, when the vertical prestressed duct is grouted, the third pipeline is installed in the prestressed duct, and grouting can be performed.
Further, after the valve of the exhaust pipeline is closed in the step (3), the pre-stressed duct is pressurized, and then the valve of the grouting pipeline is closed. The pressurizing treatment is carried out on the prestressed duct, so that the situation that grouting is not full at the top angle of the prestressed duct can be prevented, and the grouting quality is ensured.
Compared with the prior art, the invention has the beneficial effects that:
1. the grouting device is characterized in that a grouting hole is formed in an anchor backing plate and is connected with a grouting device, one end of a second pipeline in the grouting device is connected with a grouting pipeline, the other end of the second pipeline is connected with a third pipeline, the grouting pipeline can be externally connected with grouting equipment, and grouting liquid is pressed into a prestressed pore channel through the grouting pipeline, the second pipeline and the third pipeline to realize grouting into the prestressed pore channel; one end of the first pipeline in the grouting device is connected with the exhaust pipeline, the other end of the first pipeline is connected with the grouting hole, the first pipeline is communicated with the prestressed duct, and in the grouting process, air in the duct can be discharged through the grouting hole, the first pipeline and the exhaust pipeline. The grouting device can ensure the connection compactness, can discharge air in the prestressed duct, improves the air discharge rate, enables the grouting liquid and the prestressed tendons to be tightly filled, effectively improves the grouting compactness of the prestressed duct, ensures the grouting quality and obviously improves the integral durability of the prestressed structure of the bridge.
2. The grouting device provided by the invention is simple in structure, convenient to install and construct, and capable of effectively improving the grouting efficiency of the prestressed duct.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a prestressed tensioning grouting device according to the invention;
FIG. 2 is a schematic structural diagram of a grouting device in the grouting device of the invention;
FIG. 3 is a front view of a grouting device in the grouting device according to the present invention;
FIG. 4 is a schematic diagram of the prestressed tensioning grouting device of the invention;
the labels in the figure are: 1-anchor backing plate, 2-grouting hole, 3-first pipeline, 4-fourth pipeline, 5-fifth pipeline, 6-exhaust pipeline, 7-grouting pipeline, 8-third pipeline, 9-fixing clamp, 10-prestressed pore channel, 11-prestressed tendon, 12-grouting liquid, 13-anchorage device, A1-exhaust pipeline control valve and A2-grouting pipeline control valve.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1-3, a grouting device for prestress tensioning comprises an anchor backing plate 1, wherein the anchor backing plate 1 is used for being connected with a prestress pore channel 10, a grouting hole 2 is formed in the anchor backing plate 1, the grouting hole 2 is communicated with the prestress pore channel 10, and the grouting hole 2 is connected with a grouting device; the slip casting device includes first pipeline 3, the second pipeline, exhaust duct 6, slip casting pipeline 7 and third pipeline 8, 3 one ends of first pipeline are connected with exhaust duct 6, the 1 other end of first pipeline can be dismantled with pressure thick liquid hole 2 and be connected, the second pipeline runs through first pipeline 3 and pressure thick liquid hole 2, second pipeline one end is connected with slip casting pipeline 7, third pipeline 8 is located prestressing force pore canal 10, the second pipeline other end can be dismantled with third pipeline 8 and be connected, be provided with the valve on exhaust duct 6 and the slip casting pipeline 7 respectively.
The anchor backing plate 1 is provided with the mud jacking hole 2, one end of the anchor backing plate 1 can be connected with the prestressed duct 10, a cavity is arranged at the position connected with the prestressed duct 10, the mud jacking hole 2 is L-shaped, one end of the mud jacking hole 2 is connected with the surface of the anchor backing plate 1, one end of the mud jacking hole 2 is connected with the cavity wall of the anchor backing plate 1, and the communication between the mud jacking hole 2 and the prestressed duct 10 is realized.
One end of a first pipeline 3 in the grouting device is detachably connected with an exhaust pipeline 6 through threads, and one end of a second pipeline is detachably connected with a grouting pipeline 7 through threads. An exhaust pipeline control valve A1 is arranged on the exhaust pipeline 6, and a grouting pipeline control valve A2 is arranged on the grouting pipeline 7 and used for controlling the opening/closing of the pipeline.
The second pipeline includes fourth pipeline 4 and fifth pipeline 5 through the screw detachable connection, and the one end that fifth pipeline 5 was kept away from to fourth pipeline 4 is connected with slip casting pipeline 7, and the one end that fourth pipeline 4 was kept away from to fifth pipeline 5 can be dismantled with third pipeline 8 and be connected. In this embodiment, fourth pipeline 4 is the steel pipe, fifth pipeline 5 is the PE hose, fifth pipeline 5 is the zigzag, fifth pipeline 5 runs through mud jacking hole 2 and can dismantle with third pipeline 8 and be connected, the internal diameter of fifth pipeline 5 is 2mm bigger than the internal diameter of third pipeline 8, fifth pipeline 5 keeps away from the tip cover of 4 one ends of fourth pipeline and establishes on third pipeline 8, and the junction passes through fixation clamp 9 to be fixed, the use of fixation clamp 9 can guarantee the closely knit nature of fifth pipeline 5 and the junction of third pipeline 8, avoid the junction to overflow the thick liquid. In some embodiments, the fifth pipe 5 and the third pipe 8 may be connected by threads, the fifth pipe 5 and the third pipe 8 being of the same internal diameter.
The second pipeline penetrates through the first pipeline 3, and the inner diameter of the first pipeline 3 is 6-30mm larger than that of the second pipeline. In the present embodiment, the inner diameter of the first pipe 3 is 24mm, the inner diameters of the fourth pipe 4 and the fifth pipe 5 are both 14mm, the second pipe penetrates through the first pipe 3 and the mud jacking hole 2, a gap exists between the second pipe and the first pipe 3 and the mud jacking hole 2, and air in the pre-stressed duct 10 can pass through the gap between the first pipe 3 and the second pipe and be discharged from the exhaust pipe 6.
In the present embodiment, the third pipe 8 is located in the prestressed duct 10, the length of the third pipe 8 is b, and the length of the prestressed duct 10 is b 1 ，0.6b 1 ≤b<b 1 。
In the grouting device of the embodiment, one end of the second pipeline is connected with the grouting pipeline 7, the other end of the second pipeline is connected with the third pipeline 8, the grouting pipeline 7 can be externally connected with grouting equipment, and grouting liquid is pressed into the prestressed pore channel 10 through the grouting pipeline 7, the second pipeline and the third pipeline 8 to realize grouting into the prestressed pore channel 10; one end of a first pipeline 3 in the grouting device is connected with an exhaust pipeline 6, the other end of the first pipeline is connected with a grouting hole 2, communication with a pre-stressed duct 10 is achieved, and in the grouting process, air in the duct can be discharged through the grouting hole 2, the first pipeline 3 and the exhaust pipeline 6.
Example 2
The embodiment provides a grouting method of a grouting device for prestress tensioning, which comprises the following steps of:
s1, after the construction of the prestressed duct 10 is completed, installing an anchor backing plate 1, installing prestressed tendons 11, installing a third duct 8 and performing prestressed tensioning;
s2, installing a grouting device, connecting a grouting pipeline 7 with grouting equipment, opening valves on an exhaust pipeline 6 and the grouting pipeline 7, and performing grouting construction;
and S3, when the pressure grout 12 in the exhaust pipeline 6 is discharged, closing the valve of the exhaust pipeline 6, then closing the valve of the grouting pipeline 7 to stop grouting, and finishing grouting construction.
Specifically, the grouting device adopted in this embodiment is the grouting device described in embodiment 1, and the grouting device is used for grouting the horizontal prestressed duct 10, as shown in fig. 4. In step S1, before concrete is poured, a corrugated pipe is installed, a prestressed duct 10 is formed after the concrete is solidified, then an anchor backing plate 1 is installed at an outlet of the prestressed duct 10, a through hole is formed in the middle of the anchor backing plate 1, the anchor backing plate 1 and the prestressed duct 10 are coaxially connected, and during installation, the position of a grouting hole 2 needs to be higher than the prestressed duct 10; then mounting a prestressed tendon 11, wherein the prestressed tendon 11 is a steel strand; extending a third pipeline 8 from a through hole in the middle of the anchor backing plate 1 and installing the third pipeline in the prestressed duct 10, wherein in the installation process, the third pipeline 8 is positioned right above the prestressed duct 10 and close to the inner top wall of the prestressed duct 10; the fifth pipeline 5 passes through the grout pressing hole 2, and the tail end of the fifth pipeline is sleeved on the third pipeline 8 and fixed through a fixing clamp 9. And an anchorage device 13 is installed to fix the steel strand for prestress tensioning.
In step S2, installing other components of the grouting device, screwing the first pipeline 3 and the grouting hole 2, and connecting the fourth pipeline 4 and the fifth pipeline 5; and connecting the grouting pipeline 7 with grouting equipment, and opening the exhaust pipeline control valve A1 and the grouting pipeline control valve A2 to start grouting construction. In step S3, when the pressurized slurry 12 is discharged from the exhaust pipe 6, the exhaust pipe control valve a1 is closed to pressurize the prestressed duct 10, and the grouting pipe control valve a2 is closed to complete the grouting operation.
The grouting device can ensure the connection compactness, can discharge air in the prestressed duct, improves the air discharge rate, enables the grouting liquid and the prestressed tendons to be tightly filled, effectively improves the grouting compactness of the prestressed duct, ensures the grouting quality and obviously improves the integral durability of the prestressed structure of the bridge. Meanwhile, the grouting device is simple in structure, convenient to install and construct and capable of effectively improving grouting efficiency of the prestressed duct.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The grouting device for prestress tensioning comprises an anchor backing plate (1), wherein the anchor backing plate (1) is used for being connected with a prestress pore channel (10), and is characterized in that a grouting hole (2) is formed in the anchor backing plate (1), the grouting hole (2) is communicated with the prestress pore channel (10), and the grouting hole (2) is connected with a grouting device; the grouting device comprises a first pipeline (3), a second pipeline, an exhaust pipeline (6), a grouting pipeline (7) and a third pipeline (8), one end of the first pipeline (3) is connected with the exhaust pipeline (6), the other end of the first pipeline (3) is detachably connected with the grouting hole (2), the second pipeline penetrates through the first pipeline (3) and the grouting hole (2), one end of the second pipeline is connected with the grouting pipeline (7), the other end of the second pipeline is detachably connected with the third pipeline (8), the third pipeline (8) is located in the prestress hole (10), the third pipeline (8) is b in length, and the prestress hole (10) is b in length 1 ，0.6b 1 ≤b<b 1 (ii) a And valves are respectively arranged on the exhaust pipeline (6) and the grouting pipeline (7).
2. Grouting device according to claim 1, characterised in that the inner diameter of the first pipe (3) is 6-30mm larger than the inner diameter of the second pipe.
3. The grouting device according to claim 1, characterized in that the second pipeline comprises a fourth pipeline (4) and a fifth pipeline (5) which are detachably connected, the end of the fourth pipeline (4) far away from the fifth pipeline (5) is connected with the grouting pipeline (7), and the end of the fifth pipeline (5) far away from the fourth pipeline (4) is detachably connected with the third pipeline (8).
4. Grouting device according to claim 3, characterised in that said fifth pipe (5) is screwed to the third pipe (8), said fifth pipe (5) and third pipe (8) having the same internal diameter.
5. A grouting device according to claim 3, characterised in that the fourth pipe (4) is a steel pipe and the fifth pipe (5) is a PE hose.
6. Grouting device according to claim 5, characterised in that the fifth pipe (5) is fitted with its end over the third pipe (8) and is fixed by means of a fixing clip (9).
7. A grouting method for a grouting device according to any one of claims 1-6, characterised in that it comprises the following steps:
s1, mounting the anchor backing plate (1), mounting a prestressed tendon (11), mounting the third pipeline (8) and performing prestressed tensioning after the construction of the prestressed duct (10) is completed;
s2, installing the grouting device, connecting the grouting pipeline (7) with grouting equipment, opening valves on the exhaust pipeline (6) and the grouting pipeline (7) and performing grouting construction;
s3, when the pressure grout (12) in the exhaust pipeline (6) is discharged, closing a valve of the exhaust pipeline (6), then closing a valve of the grouting pipeline (7) to stop grouting, and completing the grouting construction.
8. The grouting method according to claim 7, characterised in that, in the grouting of the horizontally pre-stressed duct (10), the third duct (8) is installed directly above the pre-stressed duct (10) and close to the inner ceiling of the pre-stressed duct (10); when the anchor backing plate (1) is installed, the grouting hole (2) is higher than the prestressed duct (10).
9. The grouting method according to claim 7, characterized in that after the valve of the exhaust duct (6) is closed in step (3), the pre-stressed duct (10) is pressurized and the valve of the grouting duct (7) is closed.
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