CN113403931A - Connection structure and construction method of large-tolerance foam-filled prefabricated capping beam and pier - Google Patents
Connection structure and construction method of large-tolerance foam-filled prefabricated capping beam and pier Download PDFInfo
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- CN113403931A CN113403931A CN202110660897.0A CN202110660897A CN113403931A CN 113403931 A CN113403931 A CN 113403931A CN 202110660897 A CN202110660897 A CN 202110660897A CN 113403931 A CN113403931 A CN 113403931A
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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
- E01D19/00—Structural or constructional details of bridges
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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
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Abstract
The invention relates to a connection structure and a construction method of a large-tolerance foam-filled prefabricated capping beam and a pier, wherein the large-tolerance foam-filled prefabricated capping beam comprises the pier and a cavity prefabricated capping beam formed on a capping beam body after a foam block is removed, the top of the pier is provided with a top reinforcing steel bar extending into the cavity, and a grouting material is filled in a gap between the top reinforcing steel bar and the cavity; the large-tolerance foam-filled precast capping beam comprises a capping beam body and a foam block filled in the capping beam body and used for forming a cavity on the capping beam body after being detached. Compared with the prior art, the prefabricated bent cap and the pier are connected after the grouting material has the strength, and compared with grouting sleeve connection and corrugated pipe connection, the cavity design with larger installation tolerance greatly reduces the precision requirement when the prefabricated bent cap and the pier are assembled, thereby reducing the construction difficulty and improving the construction speed.
Description
Technical Field
The invention belongs to the field of bridge engineering, and particularly relates to a connection structure of a large-tolerance foam-filled prefabricated capping beam and a pier and a construction method.
Background
The grouting sleeve connection and the grouting metal corrugated pipe connection are the main methods for connecting the prefabricated capping beam and the prefabricated pier at present due to the high construction speed and good mechanical property, but the two connection methods have high requirements on construction precision, the installation error of the grouting metal corrugated pipe connection is usually required to be within +/-3 cm, the grouting sleeve connection is required to be harsher, and the difficulty of connection construction between the prefabricated pier and the prefabricated capping beam is greatly increased. Particularly, in western mountainous areas, for double-column piers or bent piers with higher pier heights and poorer construction conditions, the accurate butt joint of the capping beam and the pier is difficult to realize. The invention provides a novel connecting structure of a prefabricated capping beam and a pier and a construction method thereof, aiming at reducing the difficulty of connecting construction of the traditional prefabricated capping beam and the prefabricated pier and accelerating the connecting construction of the prefabricated pier and the prefabricated capping beam.
Disclosure of Invention
The invention aims to provide a connecting structure and a construction method of a large-tolerance foam-filled prefabricated capping beam and a pier, aiming at the problems of high construction precision requirement, high construction difficulty and time consumption increase caused by the connection of the existing prefabricated capping beam and the pier.
The purpose of the invention can be realized by the following technical scheme:
the present invention provides in a first aspect a high tolerance foam filled precast capping beam comprising:
the main body of the capping beam is provided with a capping beam,
and the foam block is filled in the cover beam body and is used for forming a cavity on the cover beam body after being detached.
Preferably, the cavity extends through the upper and lower surfaces of the lid beam body.
Preferably, the foam block is placed at the designed position of the cavity when the reinforcement cage of the bent cap body is bound, so that the filling in the bent cap body is realized.
Preferably, the foam block is provided with a longitudinal and transverse rib channel for passing through of the steel bars during steel bar cage binding of the bent cap body.
Preferably, the foam block comprises polytetrafluoroethylene foam, polyethylene foam, polyurethane foam, or polyvinyl chloride foam, or the like.
The invention provides a connection structure of a large-tolerance foam-filled precast capping beam and a pier, which comprises the pier and the precast capping beam, wherein a cavity is formed on a capping beam body after a foam block is removed; the top of the pier is provided with a top reinforcing steel bar extending into the cavity, and a gap between the top reinforcing steel bar and the cavity is filled with grouting material.
Preferably, the cavities are positioned and shaped to match the placement of the coping rebar into the cavities on the pier.
Preferably, the contact surface of the prefabricated capping beam and the pier is treated by a mortar cushion layer or epoxy glue.
Preferably, the grout comprises a high strength non-shrink cement grout or ultra high performance concrete.
Preferably, the pier is a cast-in-place pier or a prefabricated pier.
The third aspect of the invention provides a construction method of a connection structure of a large-tolerance foam-filled precast capping beam and a pier, which comprises the following steps:
s1: designing the position, shape and size of a cavity according to the arrangement and installation error requirements of top reinforcing steel bars of the pier, and designing longitudinal and transverse reinforcing steel bar channels on the foam blocks according to the arrangement of longitudinal and transverse reinforcing steel bars of the bent cap body;
s2: processing the foam block according to the design parameters of the cavity;
s3: before the reinforcement cage of the bent cap body is bound, the foam block is placed at the designed position of the cavity, the reinforcing steel bars pass through the foam block through the longitudinal and transverse reinforcement channels for arrangement and binding, and the reinforcing steel bars passing through the foam block play a role in fixing the foam block;
s4: installing a template, and pouring concrete of the bent cap body; and preferably, the concrete around the foam block is poured as synchronously as possible during pouring, so that the displacement of the concrete is prevented.
S5: after the concrete of the cover beam body forms strength, removing the foam blocks to form a cavity;
s6: splicing the precast bent cap with the cavity formed on the bent cap body after the foam block is removed with a pier, wherein the contact surface of the precast bent cap and the pier is treated by adopting a mortar cushion layer or epoxy glue;
s7: and injecting grouting material into the cavity to complete the construction of the connection structure of the large-tolerance foam-filled precast capping beam and the pier.
The method comprises the step of designing the shape of a cavity according to the top steel bar of the bridge pier extending into the prefabricated capping beam. Customizing a foam block according to the shape of the cavity, and reserving a channel for the bent cap steel bar to pass through in the foam block; then, placing the foam block at a preset position when the steel reinforcement cage of the cover beam is bound in a prefabrication factory, wherein the steel reinforcement cage of the prefabricated cover beam can easily pass through the foam block by utilizing the channel, and meanwhile, the foam block is fixed; and finally, pouring concrete, and removing the foam blocks poured in the prefabricated capping beam after the concrete reaches the designed strength, so that a large-tolerance cavity required by the connection of the prefabricated capping beam and the pier can be formed. The prefabricated bent cap and the pier can be quickly assembled on a construction site through hoisting, grouting materials are poured into the cavity after the prefabricated bent cap and the pier are hoisted in place, and the prefabricated bent cap and the pier can be reliably connected after the strength of the prefabricated bent cap meets the requirement.
When the cavity is subjected to parameter design, the accuracy which can be achieved in construction site construction needs to be fully considered, so that the size of the cavity can fully meet the installation allowable error required by construction, and the influence of construction accuracy on construction speed is reduced.
Compared with the prior art, the prefabricated bent cap and the pier are connected after the grouting material has the strength, and compared with grouting sleeve connection and corrugated pipe connection, the cavity design with larger installation tolerance greatly reduces the precision requirement when the prefabricated bent cap and the pier are assembled, thereby reducing the construction difficulty and improving the construction speed.
Drawings
Fig. 1 is a schematic diagram of a reinforcement cage of a prefabricated capping beam after a foam block is embedded.
Fig. 2 is a schematic diagram of the prefabricated cover beam after concrete pouring.
Fig. 3 is a schematic diagram of arrangement of precast capping beams and reinforcing steel bars of piers extending into the capping beams for forming cavities according to the present invention.
Fig. 4 is a schematic diagram of the prefabricated capping beam and the pier after the prefabricated capping beam and the pier are assembled.
FIG. 5 is a schematic view of the cross-tendon channels of the foam bun of the present invention.
In fig. 1-4, (a), (b) and (c) are respectively three foam block (and/or cavity and/or top steel bar) structures with different designs, (a) is a bilateral pi-shaped structure, (b) is a four-corner right-angle structure, and (c) is a four-side rectangular structure.
In the figure, 1 is a foam block, 11 is a longitudinal and transverse rib channel, 2 is a capping beam body, 21 is a reinforcement cage, 3 is a cavity, 4 is a pier, 41 is a top reinforcement, 5 is a cavity, and 6 is a mortar cushion layer or epoxy glue.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
A large tolerance foam filled precast capping beam as shown in figures 2 and 3 comprising a capping body 2 and a block of foam 1, wherein: the foam block 1 is filled in the bent cap body 2 and is used for forming a cavity 3 on the bent cap body 2 after being detached.
More specifically, in the present embodiment, it is preferable that the cavity 3 penetrates the upper and lower surfaces of the bent main body 2. During construction, the top steel bar of the pier 4 extends into the cavity 3 from the lower part, and grouting material 5 can be poured from the upper part for fixing, as shown in fig. 3 and 4.
In the embodiment, the foam block 1 is preferably placed at the designed position of the cavity 3 when the reinforcement cage 21 of the bent cap body 2 is bound, so that the filling in the bent cap body 2 is realized, as shown in fig. 1. It is further preferred that the foam blocks 1 are provided with longitudinal and transverse tendon channels 11 for the passage of tendons during the lashing of the reinforcement cages 21 of the body 2 of the cap beam, as shown in figure 5. The reinforcement cage 21 of the precast bent cap 2 can easily pass through the foam block 1 by using the longitudinal and transverse reinforcement channel 11, and meanwhile, the fixation of the foam block 1 is realized. As the foam block 1, polytetrafluoroethylene foam, polyethylene foam, polyurethane foam, or polyvinyl chloride foam, etc. can be used.
Example 2
A large tolerance foam filling precast capping beam and pier connection structure is disclosed, as shown in figures 3 and 4, and comprises a pier 4 and a precast capping beam which is provided with a cavity 3 on a capping beam body 2 after a foam block 1 is removed in example 1; the top of the pier 4 is provided with a top steel bar 41 extending into the cavity 3, and a gap between the top steel bar 41 and the cavity 3 is filled with grouting material 5.
In this embodiment, it is preferable that the cavity 5 is provided in a position and shape matching the arrangement of the top rebars 41 of the pier 4 for extending into the cavity 3. When the cavity 3 is subjected to parameter design, the accuracy which can be achieved in construction site construction needs to be fully considered, so that the size of the cavity 3 can fully meet the installation allowable error required by construction, and the influence of construction accuracy on construction speed is reduced. And the contact surface of the prefabricated capping beam and the pier 4 is treated by a mortar cushion layer or epoxy glue 7. The grouting material 5 in the cavity 3 can be poured by high-strength non-shrinkage cement grouting material or ultra-high performance concrete; the pier 4 can be a cast-in-place pier or a prefabricated pier.
The construction method of the connection structure of the large-tolerance foam-filled precast capping beam and the pier comprises the following steps of:
s1: designing the position, shape and size of the cavity 3 according to the arrangement and installation error requirements of top reinforcements 41 of the pier 4, designing longitudinal and transverse reinforcement channels 11 on the foam block 1 according to the arrangement of longitudinal and transverse reinforcements of the bent cap body 2, wherein the foam block 1 in one design form is shown in fig. 5;
s2: (foam manufacturer) processing the foam block 1 according to the design parameters of the cavity 3;
s3: (prefabrication field) before the reinforcement cage 21 of the bent cap body 2 is bound, the foam block 1 is placed at the designed position of the cavity 3, the reinforcing steel bars pass through the foam block 1 through the longitudinal and transverse reinforcement channels 11 for arrangement and binding, and the reinforcing steel bars passing through the foam block 1 play a role in fixing the foam block 1 at the same time, as shown in figure 1;
s4: installing a template, and pouring concrete of the bent cap body 2, as shown in fig. 2; when pouring, the concrete around the foam block 1 should be poured as synchronously as possible to prevent the displacement;
s5: after the concrete of the bent cap body 2 forms the strength, a cavity 3 is formed, as shown in fig. 3; the foam block 1 can be cut into small blocks by an electric heating foam cutter or a high-pressure water gun and then taken out, so that the cavity 3 is formed by removing the foam block 1, and the cavity 3 can also be formed by adopting any other feasible method;
s6: splicing a prefabricated capping beam with a cavity 3 formed on a capping beam body 2 after removing a foam block 1 with a pier 4 (by adopting a construction site hoisting mode), and treating the contact surface of the prefabricated capping beam and the pier 4 by adopting a mortar cushion layer or epoxy glue 6;
s7: and (after hoisting is finished), grouting material 5 is injected into the cavity 3, and construction of the connection structure of the large-tolerance foam-filled precast capping beam and the pier is finished as shown in fig. 4.
The grouting material provided by the invention realizes the connection between the prefabricated capping beam and the pier after forming the strength, and compared with grouting sleeve connection and corrugated pipe connection, the cavity design with larger installation tolerance greatly reduces the precision requirement when the prefabricated capping beam and the pier are assembled, thereby reducing the construction difficulty and improving the construction speed.
The shape of the foam block (and/or the cavity and/or the top steel bar) structure can be a double-edge pi-shaped structure (see (a) in fig. 1-4), a four-corner right-angle structure (see (b) in fig. 1-4), a four-side rectangular structure (see (c) in fig. 1-4) and the like. The three structural forms are only used for illustration, and can not be limited to the three forms, and in practice, the three structural forms can be provided with suitable shapes according to requirements.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. Large tolerance foam filled precast capping beam, comprising:
a cover beam body (2),
the foam block (1) is filled in the cover beam body (2) and is used for forming a cavity (3) on the cover beam body (2) after being detached.
2. The high tolerance foam filled precast capping beam according to claim 1, characterized in that the cavity (3) penetrates the upper and lower surfaces of the capping body (2).
3. The large tolerance foam filled precast capping beam according to claim 1 or 2, characterized in that the foam block (1) is placed at the designed position of the cavity (3) when the reinforcement cage (21) of the capping beam body (2) is lashed, enabling filling inside the capping beam body (2).
4. A large tolerance foam filled precast capping beam according to claim 3 characterized in that the foam blocks (1) are provided with longitudinal and transverse tendon channels (11) for the passage of the tendons when the cage (21) of the capping beam body (2) is tied.
5. The large tolerance foam-filled precast capping beam according to claim 1, wherein the foam block (1) comprises a polytetrafluoroethylene foam, a polyethylene foam, a polyurethane foam or a polyvinyl chloride foam.
6. The connection structure of the large-tolerance foam-filled precast capping beam and the pier is characterized by comprising the pier (4) and the precast capping beam as claimed in any one of claims 1 to 5, wherein a cavity (3) is formed on the capping beam body (2) after the foam block (1) is removed; the top of the pier (4) is provided with a top steel bar (41) extending into the cavity (3), and a gap between the top steel bar (41) and the cavity (3) is filled with grouting material (5).
7. The construction for connecting a large-tolerance foam-filled precast capping beam to an abutment according to claim 6, wherein the cavity (5) is provided at a position and in a shape matching the arrangement of the top reinforcing bars (41) of the abutment (4) for extending into the cavity (3).
8. The large-tolerance foam-filled precast capping beam and pier connection construction according to claim 6, wherein the contact surface of the precast capping beam and pier (4) is treated with a mortar bed or epoxy glue (7).
9. The large-tolerance foam-filled precast capping beam and pier connection construction of claim 6, wherein:
the grouting material (5) comprises high-strength non-shrinkage cement grouting material or ultra-high performance concrete;
the pier (4) is a cast-in-place pier or a prefabricated pier.
10. The construction method of the large tolerance foam-filled precast capping beam and pier connection construction as set forth in any one of claims 6 to 9, comprising the steps of:
s1: designing the position, shape and size of the cavity (3) according to the arrangement and installation error requirements of top steel bars (41) of the pier (4), and designing longitudinal and transverse steel bar channels (11) on the foam block (1) according to the arrangement of longitudinal and transverse steel bars of the bent cap body (2);
s2: processing the foam block (1) according to the design parameters of the cavity (3);
s3: the foam block (1) is placed at the designed position of the cavity (3) before the reinforcement cage (21) of the bent cap body (2) is bound, the reinforcement penetrates through the foam block (1) through the longitudinal and transverse reinforcement channels (11) to be arranged and bound, and the reinforcement penetrating through the foam block (1) simultaneously plays a role in fixing the foam block (1);
s4: installing a template, and pouring concrete of the bent cap body (2);
s5: after the concrete of the bent cap body (2) forms strength, the foam block (1) is removed to form a cavity (3);
s6: splicing a prefabricated capping beam with a cavity (3) formed on a capping beam body (2) after a foam block (1) is removed with a pier (4), and treating the contact surface of the prefabricated capping beam and the pier (4) by adopting a mortar cushion layer or epoxy glue (6);
s7: and (3) injecting grouting material (5) into the cavity (3) to finish the construction of the connection structure of the large-tolerance foam-filled precast capping beam and the pier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110660897.0A CN113403931A (en) | 2021-06-15 | 2021-06-15 | Connection structure and construction method of large-tolerance foam-filled prefabricated capping beam and pier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110660897.0A CN113403931A (en) | 2021-06-15 | 2021-06-15 | Connection structure and construction method of large-tolerance foam-filled prefabricated capping beam and pier |
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| Publication Number | Publication Date |
|---|---|
| CN113403931A true CN113403931A (en) | 2021-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110660897.0A Pending CN113403931A (en) | 2021-06-15 | 2021-06-15 | Connection structure and construction method of large-tolerance foam-filled prefabricated capping beam and pier |
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| CN (1) | CN113403931A (en) |
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- 2021-06-15 CN CN202110660897.0A patent/CN113403931A/en active Pending
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