CN114606868B - Construction method and supporting structure for overspan gas pipeline bridge - Google Patents
Construction method and supporting structure for overspan gas pipeline bridge Download PDFInfo
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- CN114606868B CN114606868B CN202210315996.XA CN202210315996A CN114606868B CN 114606868 B CN114606868 B CN 114606868B CN 202210315996 A CN202210315996 A CN 202210315996A CN 114606868 B CN114606868 B CN 114606868B
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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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- 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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
Abstract
The invention discloses an overspan gas pipeline bridge construction method and a supporting structure, which belong to the technical field of bridge construction safety, and the overspan gas pipeline bridge construction method comprises the following steps: pile foundation construction, prestress bearing platform construction, lower structure construction, cast-in-situ beam construction and precast beam installation. In the construction process, the vibration-proof pile foundation pore-forming technology, the overhead bracket erecting technology and the bridge floor table hanging method beam slab installing technology are adopted, so that the vibration-proof pile foundation pore-forming technology has better safety protection on the gas pipeline, achieves the construction purposes of no interference and no vibration on the pipeline, and effectively protects the safety of the gas pipeline.
Description
Technical Field
The invention relates to the technical field of bridge construction safety, in particular to an overspan gas pipeline bridge construction method and a supporting structure.
Background
With the development of urban processes, more and more bridges in cities inevitably encounter situations requiring crossing of high-pressure gas pipelines when constructing the bridges. The condition of crossing with the existing oil and gas pipelines in bridge construction brings great difficulty to construction and has extremely high safety risk. Once the high-pressure gas pipeline leaks, accidents such as ground injection fire, underground space explosion and the like caused by the leakage of the high-pressure gas pipeline can cause serious damage to peripheral facilities.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and therefore, the invention provides an up-span gas pipeline bridge construction method which can perform better safety protection on each working procedure in the construction process and protect a gas pipeline.
The invention further aims to provide a support structure built by the construction method of the overspan gas pipeline bridge.
The construction method of the overspan gas pipeline bridge provided by the embodiment of the invention comprises the following steps:
step 1: constructing a plurality of pile foundations on two sides of a gas pipeline, wherein the distance between each pile foundation and the gas pipeline is more than 5m, and the pile foundation construction adopts a drilling construction technology;
step 2: paving a sand layer on the ground outside the gas pipeline area, filling up the sand layer, erecting a bearing platform bottom die on the sand layer, erecting a prestress bearing platform crossing the gas pipeline on the basis of the bearing platform bottom die and pile foundations on two sides of the gas pipeline, and removing the sand layer after the prestress bearing platform is erected;
step 3: installing a pier and an abutment on the prestress bearing platform, erecting a capping beam on the cylindrical pier, wherein the pier, the capping beam and the abutment are all of reinforced concrete structures, a shaping steel die is adopted as a template, the shaping steel die is fixed on a bracket, and a cable rope is arranged on the shaping steel die;
step 4: setting up a cast-in-situ beam support on the ground, wherein an overhead non-falling support is adopted in an area above a gas pipeline, a falling full-hall support is adopted in an area outside the gas pipeline, and a cast-in-situ beam bottom mould system is paved at the top of the support;
step 5: constructing a cast-in-situ beam on a cast-in-situ beam bottom die system, wherein the cast-in-situ beam comprises a hollow beam plate and a solid beam plate;
step 6: and installing the prefabricated box girder, wherein the prefabricated girder is arranged by adopting two automobile hangers, the two automobile hangers are respectively positioned at two sides of a bridge span to be constructed, one automobile hanger is positioned on a cast-in-situ girder bridge deck after construction is completed, the other automobile hanger is positioned on the ground, and the two automobile hangers respectively lift the two ends of the prefabricated box girder to be erected.
The construction method of the overspan gas pipeline bridge provided by the embodiment of the invention has at least the following beneficial effects: in the construction process, the vibration-proof pile foundation pore-forming technology, the overhead bracket erecting technology and the bridge floor table hanging method beam slab installing technology are adopted, so that the vibration-proof pile foundation pore-forming technology has better safety protection on the gas pipeline, achieves the construction purposes of no interference and no vibration on the pipeline, and effectively protects the safety of the gas pipeline.
According to some embodiments of the invention, in step 3, the construction equipment is kept at a distance of 5m or more from the gas pipeline while constructing the piers, abutments and cap beams of the bridge.
According to some embodiments of the invention, in step 4, setting up the cast-in-place beam holder comprises:
step 4.1: placing a plurality of groups of bailey piece main beams on the top surface of the prestress bearing platform along the longitudinal direction, wherein the transverse distance between each group of bailey piece main beams is not more than 3.6m;
step 4.2: a plurality of I-steel distribution beams are transversely arranged above the bailey piece main beam, and the longitudinal distance between each two I-steel distribution beams is not more than 1.5m;
step 4.3: the I-steel distribution beam is provided with socket type disc buckle steel pipe brackets, the longitudinal spacing of the steel pipes is 1.5m, and the transverse spacing of the steel pipes is 0.9m;
step 4.4: and paving a cast-in-situ beam bottom mould system at the top of the socket type disc buckle steel pipe bracket.
According to some embodiments of the invention, multiple sets of bailey piece girders are integrally connected by transverse links between each set of bailey piece girders.
According to some embodiments of the invention, the I-steel distribution beam is braced with rebar welding.
According to some embodiments of the invention, the socket type disc buckle steel pipe support is locked with the pier stud through the inclined rod and the horizontal rod, and the operation platform at the top of the socket type disc buckle steel pipe support is provided with a limb railing and a skirting board.
According to some embodiments of the invention, drainage ditches are arranged on two sides of the prestress bearing platform.
A support structure according to an embodiment of the present invention includes: the pile foundations are arranged on two sides of the gas pipeline; the two ends of the bearing platform bottom die are respectively arranged on the pile foundation, the bearing platform bottom die spans the gas pipeline pre-stress bearing platform, and the pre-stress bearing platform is arranged on the bearing platform bottom die; the lower structure comprises a pier, a capping beam and a bridge abutment, wherein the pier and the bridge abutment are arranged on the prestress bearing platform, and the capping beam is arranged on the bridge abutment and the pier; the support structure comprises an overhead support and a floor support, wherein the overhead support is arranged above the gas pipeline, and the floor support is arranged outside the gas pipeline area.
According to some embodiments of the invention, a floor stand comprises: the plurality of groups of bailey piece main beams are longitudinally erected on the top surface of the prestress bearing platform, and the transverse distance between each group of bailey piece main beams is not more than 3.6m; the plurality of I-steel distribution beams are transversely erected on the top surface of the Bailey girder, and the longitudinal distance between each two groups of I-steel distribution beams is not more than 1.5m; the steel pipe support is erected on the top end of the I-steel distribution beam, the longitudinal spacing of the steel pipes is 1.5m, and the transverse spacing of the steel pipes is 0.9m.
According to some embodiments of the invention, the beam sets of bailey pieces are connected by transverse connecting rods, diagonal bracing steel bars are welded on the I-steel distribution beams, and the socket type disc buckle steel pipe bracket is connected with the bridge pier by the diagonal rods and the horizontal rods.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic view of a pile foundation and a prestressed cap according to an embodiment of the present invention;
FIG. 2 is a top view of the base mold of the platform of FIG. 1;
FIG. 3 is a schematic view of a support structure according to an embodiment of the present invention;
fig. 4 is a top plan view of a station of an automotive crane according to an embodiment of the invention.
Reference numerals:
a base mold 200; i25# I-steel 210; c30 concrete foundation 220; a protective cover 230;
a pre-stress bearing platform 300;
beret main beam 510; socket-type disc buckle steel pipe bracket 520;
a cast-in-place beam 600; a hollow beam plate 610; a solid beam plate 620;
a petroleum line 1; natural gas pipeline 2, truck crane 3.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present invention, but not to limit the scope of the present invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
An overspan gas pipeline bridge construction method and a support structure according to an embodiment of the present invention are described with reference to fig. 1 to 4.
As shown in fig. 1 to 4, a soft soil foundation embankment disease treatment construction method according to an embodiment of the present invention includes:
step 1: constructing a plurality of pile foundations 100 on two sides of a gas pipeline, wherein the distance between each pile foundation 100 and the gas pipeline is more than 5m, and the pile foundations 100 are constructed by adopting a drilling construction technology;
step 2: paving a sand layer on the ground outside the gas pipeline area, filling up the sand layer, erecting a bearing platform bottom die 200 on the sand layer, erecting a prestress bearing platform 300 which spans the gas pipeline on the basis of the bearing platform bottom die 200 and pile foundations 100 on two sides of the gas pipeline, and removing the sand layer after the prestress bearing platform 300 is erected;
step 3: installing a pier 410 and a bridge abutment on the prestress bearing platform 300, erecting a cap beam 420 on the cylindrical pier, wherein the pier 410, the cap beam 420 and the bridge abutment are all of reinforced concrete structures, a shaping steel die is adopted as a template, the shaping steel die is fixed on a bracket, and a cable rope is arranged on the shaping steel die;
step 4: setting up a cast-in-situ beam 600 bracket on the ground, adopting an overhead non-falling bracket in an area above a gas pipeline, adopting a falling full-hall bracket in an area outside the gas pipeline, and paving a cast-in-situ beam 600 bottom die system at the top of the bracket;
step 5: constructing a cast-in-situ beam 600 on a cast-in-situ beam 600 bottom die system, wherein the cast-in-situ beam 600 comprises a hollow beam plate 610 and a solid beam plate 620;
step 6: and installing the prefabricated box girder, wherein the prefabricated girder is erected by adopting two automobile cranes 3, the two automobile cranes 3 are respectively positioned at two sides of a bridge span to be constructed, one automobile crane 3 is positioned on the cast-in-situ girder 600 bridge deck after construction is completed, the other automobile crane 3 is positioned on the ground, and the two automobile cranes 3 respectively lift the two ends of the prefabricated box girder for erection.
As shown in fig. 1, in the construction of a bridge pile foundation, a gas pipeline comprises a petroleum pipeline 1 and a natural gas pipeline 2, pile foundations 100 on two sides of an upper span gas pipeline part of a bridge are respectively positioned on the left side and the right side of the petroleum pipeline 1 and the natural gas pipeline 2, the distances between the pile foundations 100 on two sides and the petroleum pipeline 1 and the natural gas pipeline 2 are respectively larger than 5m, the areas where the petroleum pipeline 1 and the natural gas pipeline 2 are positioned are pipeline protection areas, construction operation cannot invade the pipeline protection areas, the construction of the pile foundations 100 adopts a rotary drilling construction technology, and the vibration influence on the petroleum pipeline 1 and the natural pipeline is reduced.
As shown in fig. 1 and 2, in the construction of the bridge prestressed cap 300, the prestressed cap 300 is arranged above the gas pipeline in a crossing manner, two ends of the prestressed cap 300 are respectively fixed on pile foundations 100 on the left side and the right side of the gas pipeline, the prestressed cap 300 is in overhead implementation, and the prestressed cap 300 is about 30cm to 50cm away from the ground, so that after the bridge is built, the bridge load is not pressed on the gas pipeline, and the construction of the prestressed cap 300 does not need to perform foundation pit excavation work, so that the influence on the gas pipeline is further avoided. The bearing platform bottom die 200 comprises I25# I-steel 210, a C30 concrete foundation 220 and a protective cover plate 230. In order to ensure that the gas pipeline is not extruded by the upper construction load in the construction process, sand filling support is adopted between the bearing platform bottom die 200 outside the pipeline protection area and the ground, and the sand is removed after the construction of the prestress bearing platform 300 is completed. In the construction process of the pre-stress bearing platform 300, temporary drainage measures are set, for example, drainage ditches are set on two sides of the pre-stress bearing platform 300, so that water accumulation in the area above the gas pipeline is prevented.
As shown in fig. 3, in the construction of the lower structure of the bridge, the bridge pier 410 is a cylindrical pier, the bridge pier 410, the capping beam 420 and the bridge abutment are all in reinforced concrete structures, and the reinforcing bars of the bridge pier 410, the capping beam 420 and the bridge abutment are formed in a reinforcing bar field and transported to the site for installation. Their templates are shaped steel forms fixed to the pre-stressing platform 300. Because pier 410 and bent cap 420 are located pipeline top region, construction effect is likely to invade in the pipeline protection zone, therefore during the construction, need strengthen the fixed of design steel mould through the support, and strengthen and prevent hoist and mount operation and bent cap 420 construction high altitude weight thing, all set up the cable rope on the cat ladder that sets up during design steel mould and construction, prevent to empty. When in construction, the large-scale mechanical equipment needs to keep a distance of more than 5m from the pipeline, and cannot invade the pipeline protection area.
As shown in fig. 3, in the construction of the bridge cast-in-situ beam 600, a steel pipe bracket method of setting up full hall plate buckles is adopted for construction, in order to avoid the gas pipeline from being extruded by construction load, the full hall bracket is required to be ensured not to be pressed on the gas pipeline, the bracket above the gas pipeline adopts an overhead bracket, the overhead bracket does not fall to the ground, the area outside the pipeline area adopts a floor full hall bracket, and a cast-in-situ beam 600 bottom die system is paved at the top of the bracket. Erecting a cast-in-situ beam 600 bracket comprises: placing a plurality of groups of bailey piece main beams 510 on the top surface of the prestress bearing platform 300 along the longitudinal direction, wherein the transverse distance between each group of bailey piece main beams 510 is not more than 3.6m; a plurality of I-steel distribution beams are transversely arranged above the Bailey sheet main beam 510, and the longitudinal distance between each I-steel distribution beam is not more than 1.5m; the I-steel distribution beam is provided with a socket type disc buckle steel pipe bracket 520, the longitudinal spacing of the steel pipes is 1.5m, and the transverse spacing of the steel pipes is 0.9m; and paving a bottom die system of the cast-in-situ beam 600 on the top of the socket type disc buckle steel pipe bracket 520.
Because the cast-in-situ beam 600 bracket is positioned above the gas pipeline, the collapse of the bracket and the high-altitude falling object can damage the gas pipeline to cause serious safety accidents. Therefore, transverse connecting rods are arranged among the multiple groups of beret sheet main beams 510, the multiple groups of beret sheet main beams 510 are connected into a whole, and the I-steel distribution beams are welded by steel bars to form diagonal braces so as to prevent overturning, thus enhancing the overall stability. The socket type disc buckle steel pipe bracket 520 is locked with the pier stud through the inclined rod and the horizontal rod, so that the bracket is ensured to be stable to prevent collapse accidents, and the operation platform at the top of the socket type disc buckle steel pipe bracket 520 is provided with a limb railing and a skirting board to prevent articles on the operation platform from falling.
As shown in fig. 4, in the construction of the installation of the precast beam for the bridge, the installation of the precast box beam is then performed on the cast-in-situ beam 600 section which has completed the construction, two automobile cranes 3 are used to respectively hoist both ends of the precast box beam, one automobile is arranged on the bridge deck of the cast-in-situ beam 600 section which has completed the construction, and the other automobile crane 3 is arranged on the ground where the gas pipeline is not buried, thereby reducing the construction load which generates the extrusion gas pipeline in the construction process.
In summary, in the construction process, the vibration-proof pile foundation pore-forming technology, the overhead bracket erecting technology and the bridge floor platform hanging method beam slab installing technology are adopted, so that the gas pipeline has better safety protection, and the purposes of no interference and vibration construction on the pipeline are achieved, and the safety of the gas pipeline is effectively protected.
The following describes the construction method of the over-span gas pipeline bridge by using a specific embodiment:
the ramp bridge relates to the part of the upper span gas pipeline and totally has 3 spans, 5 piers 410 and 10 pile foundations 100 are correspondingly arranged, wherein the 1 st to 4 th piers 410 are respectively arranged on the left side and the right side of the pipeline in a crossing mode, the 5 th piers 410 are positioned on the right side of the pipeline, the corresponding pile foundations 100 are positioned on the right side of the pipeline, the pile diameter of the pile foundations 100 is 1.6m, the pile length is 33m, the distance between all pile foundations 100 and the gas pipeline is greater than 5m, the pile foundations 100 cannot invade a pipeline protection area during construction, the pile foundations 100 are constructed by adopting a rotary drilling construction technology, and the vibration influence on the gas pipeline is reduced.
After the pile foundation 100 is constructed, the prestressed bearing platform 300 is constructed, 5 piers 410 correspond to 5 prestressed bearing platforms 300, and the prestressed bearing platforms 300 are 2.6m wide, 2m to 2.5m high and 19.4m to 25.5m long. In order to ensure that the bridge load is not pressed on the gas pipeline after the bridge is built, the prestress bearing platform 300 is designed to be in an overhead mode and not fall on the ground, the distance between the bottom of the prestress bearing platform 300 and the ground is about 30cm to 50cm, and foundation pit excavation operation is not needed for construction of the prestress bearing platform 300. And adopting sand filling support between the bearing platform bottom die 200 outside the pipeline protection area and the ground, and removing sand after the construction of the prestress bearing platform 300 is completed. In the construction process of the pre-stress bearing platform 300, drainage ditches are arranged on two sides of the pre-stress bearing platform 300, so that water accumulation in the area above the gas pipeline is prevented.
Erecting a lower structure of a bridge on the prestress bearing platform 300, wherein the bridge piers 410 are cylindrical piers with the diameter of 1.2m, the bridge piers 410 stand on the bearing platform, and the height of the bridge piers 410 is 2.7m to 3.4m; the bridge pier 410, the capping beam 420 and the bridge abutment are all of reinforced concrete structures, and the reinforcing steel bars of the bridge pier 410, the capping beam 420 and the bridge abutment are processed and molded in a reinforcing steel bar field and transported to site installation. Their templates are shaped steel forms fixed to the pre-stressing platform 300. The fixing of the shaping steel mould is reinforced through the support, and the lifting operation and the overhead falling object construction of the bent cap 420 are reinforced and prevented, and the cable ropes are arranged on the shaping steel mould and the climbing ladder arranged during construction, so that the falling is prevented. When in construction, the large-scale mechanical equipment needs to keep a distance of more than 5m from the pipeline, and cannot invade the pipeline protection area.
The 1 st span of the bridge is a cast-in-situ hollow slab beam, the 2 nd span is a cast-in-situ solid slab beam, the 3 rd span is a prefabricated box beam, the 1 st span to the 3 rd span of the cast-in-situ beam 600 is firstly constructed, the height of the hollow slab beam is 1.3m, the height of the solid slab beam is 0.75m, the construction is carried out by adopting a method of erecting a full-hall coiled steel pipe bracket, a bracket above a gas pipeline is an overhead bracket, the overhead bracket does not fall to the ground, and a region outside a pipeline region is a floor full-hall bracket, and the concrete scheme is as follows: placing a plurality of groups of bailey piece main beams 510 on the top surface of the prestress bearing platform 300 along the longitudinal direction, wherein the transverse distance between each group of bailey piece main beams 510 is not more than 3.6m; a plurality of I-steel distribution beams are transversely arranged above the Bailey girder 510, the longitudinal distance between each I-steel distribution beam is 1.5m, and I25a I-steel is adopted as the I-steel distribution beam; erecting a phi 60 multiplied by 3.2mm socket type disc buckle steel pipe bracket 520 on the I-steel distribution beam, wherein the longitudinal spacing of the steel pipes is 1.5m, and the transverse spacing of the steel pipes is 0.9m; and paving a bottom die system of the cast-in-situ beam 600 on the top of the socket type disc buckle steel pipe bracket 520. Transverse connecting rods are arranged among the multiple groups of beret sheet main beams 510, the multiple groups of beret sheet main beams 510 are connected into a whole, and the I-steel distribution beams are welded with diagonal braces through reinforcing steel bars to prevent overturning, so that the overall stability is enhanced. The socket type disc buckle steel pipe bracket 520 is locked with the pier stud through the inclined rod and the horizontal rod, so that the bracket is ensured to be stable to prevent collapse accidents, and the operation platform at the top of the socket type disc buckle steel pipe bracket 520 is provided with a limb railing and a skirting board to prevent articles on the operation platform from falling.
The upper structure of the 3 rd span of the bridge is 4 prefabricated box girders with the size of 25m, the weight of a single piece is about 75t, two 220t automobile cranes 3 are adopted for erection, wherein 1 automobile crane 3 is positioned on a cast-in-situ girder 600 bridge deck with the 1 st span and the 2 nd span being constructed, the other automobile crane 3 is positioned on the front side of a pier 410 in front of the 3 rd span, the maximum working radius is 12m, the lifting height is about 7m, according to a 220t automobile crane 3 lifting performance table, the amplitude of a 54m main arm 220t automobile crane 3 is 18m, when the arm length is 21m, the rated lifting weight is 52.2t, 52.2+52.2=104.4t×80% = 83.52t > 75t, and the safety coefficient meets the requirements.
As shown in fig. 1 to 3, a support structure for an overspan gas pipeline bridge construction method according to an embodiment of the present invention includes: a plurality of pile foundations 100, wherein the pile foundations 100 are arranged at two sides of the gas pipeline; the two ends of the bearing platform bottom die 200 are respectively arranged on the pile foundation 100, and the bearing platform bottom die 200 spans the gas pipeline; the prestress bearing platform 300 is arranged on the bearing platform bottom die 200; the lower structure comprises a pier 410, a capping beam 420 and an abutment, wherein the pier 410 and the abutment are arranged on the prestress bearing platform 300, and the capping beam 420 is arranged on the abutment and the pier 410; the support structure comprises an overhead support and a floor support, wherein the overhead support is arranged above the gas pipeline, and the floor support is arranged outside the gas pipeline area. Thus, the load born by the bridge or the load in the construction process is prevented from extruding the gas pipeline.
In the above technical scheme, the floor stand includes: the multiple groups of bailey pieces main beams 510 are longitudinally erected on the top surface of the prestress bearing platform 300, and the transverse distance between the bailey pieces main beams 510 of each group is not more than 3.6m; the plurality of I-steel distribution beams are transversely erected on the top surface of the Bailey girder 510, and the longitudinal spacing between each group of I-steel distribution beams is not more than 1.5m; the steel pipe bracket 520 is buckled to socket joint formula dish, and socket joint formula dish buckles steel pipe bracket 520 and sets up on I-steel distribution beam top, and in the steel pipe bracket 520 was buckled to socket joint formula dish, the longitudinal distance of steel pipe was 1.5m, and the lateral distance of steel pipe was 0.9m. Each group of beret sheet main beams 510 are connected through a transverse connecting rod, diagonal bracing steel bars are welded on the I-steel distribution beams, and the socket type disc buckle steel pipe bracket 520 is connected with the bridge pier through diagonal rods and horizontal rods. Therefore, the stability of the support is ensured, and the influence of collapse of the support and high-altitude falling objects on the gas pipeline is prevented.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.
Claims (10)
1. The construction method of the overspan gas pipeline bridge is characterized by comprising the following steps of:
step 1: constructing a plurality of pile foundations on two sides of a gas pipeline, wherein the distance between each pile foundation and the gas pipeline is more than 5m, and the pile foundation construction adopts a drilling construction technology;
step 2: paving a sand layer on the ground outside the gas pipeline area, filling up the sand layer, erecting a bearing platform bottom die on the sand layer, erecting a prestress bearing platform crossing the gas pipeline on the basis of the bearing platform bottom die and pile foundations on two sides of the gas pipeline, and removing the sand layer after the prestress bearing platform is erected;
step 3: installing a pier and an abutment on the prestress bearing platform, erecting a capping beam on the cylindrical pier, wherein the pier, the capping beam and the abutment are all of reinforced concrete structures, a shaping steel die is adopted as a template, the shaping steel die is fixed on a bracket, and a cable rope is arranged on the shaping steel die;
step 4: setting up a cast-in-situ beam support on the ground, wherein an overhead non-falling support is adopted in an area above a gas pipeline, a falling full-hall support is adopted in an area outside the gas pipeline, and a cast-in-situ beam bottom mould system is paved at the top of the support;
step 5: constructing a cast-in-situ beam on a cast-in-situ beam bottom die system, wherein the cast-in-situ beam comprises a hollow beam plate and a solid beam plate;
step 6: and installing the prefabricated box girder, wherein the prefabricated girder is arranged by adopting two automobile hangers, the two automobile hangers are respectively positioned at two sides of a bridge span to be constructed, one automobile hanger is positioned on a cast-in-situ girder bridge deck after construction is completed, the other automobile hanger is positioned on the ground, and the two automobile hangers respectively lift the two ends of the prefabricated box girder to be erected.
2. The construction method of the overspan gas pipeline bridge according to claim 1, wherein in the step 3, the construction equipment maintains a distance of 5m or more from the gas pipeline when constructing the bridge pier, abutment and cap beam of the bridge.
3. The method of constructing an overspan gas pipeline bridge according to claim 1, wherein in step 4, erecting a cast-in-place beam bracket comprises:
step 4.1: placing a plurality of groups of bailey piece main beams on the top surface of the prestress bearing platform along the longitudinal direction, wherein the transverse distance between each group of bailey piece main beams is not more than 3.6m;
step 4.2: a plurality of I-steel distribution beams are transversely arranged above the bailey piece main beam, and the longitudinal distance between each two I-steel distribution beams is not more than 1.5m;
step 4.3: the I-steel distribution beam is provided with socket type disc buckle steel pipe brackets, the longitudinal spacing of the steel pipes is 1.5m, and the transverse spacing of the steel pipes is 0.9m;
step 4.4: and paving a cast-in-situ beam bottom mould system at the top of the socket type disc buckle steel pipe bracket.
4. A method of constructing a midspan gas pipeline bridge as claimed in claim 3 wherein a plurality of sets of bailey pieces of girders are integrally connected by transverse connecting rods between each set of bailey pieces of girders.
5. The construction method of the overspan gas pipeline bridge according to claim 3, wherein the I-steel distribution beam is welded with a diagonal brace by steel bars.
6. The construction method of the overspan gas pipeline bridge according to claim 3, wherein the socket type disc buckle steel pipe support is locked with the pier stud through an inclined rod and a horizontal rod, and an operation platform at the top of the socket type disc buckle steel pipe support is provided with a limb rail and a skirting board.
7. The construction method of the overspan gas pipeline bridge according to claim 1, wherein drainage ditches are formed on two sides of the prestress bearing platform.
8. A support structure for use in the construction method of the overspan gas pipeline bridge as claimed in any one of claims 1 to 7, comprising:
the pile foundations are arranged on two sides of the gas pipeline;
the two ends of the bearing platform bottom die are respectively arranged on the pile foundations, and the bearing platform bottom die spans the gas pipeline;
the prestress bearing platform is arranged on the bearing platform bottom die;
the lower structure comprises a bridge pier, a capping beam and a bridge abutment, wherein the bridge pier and the bridge abutment are arranged on the prestress bearing platform, and the capping beam is arranged on the bridge abutment and the bridge pier;
the support structure comprises an overhead support and a floor support, wherein the overhead support is arranged above the gas pipeline, and the floor support is arranged outside the gas pipeline area.
9. The support structure of claim 8, wherein the floor stand comprises:
the plurality of groups of bailey piece main beams are longitudinally erected on the top surface of the prestress bearing platform, and the transverse distance between each group of bailey piece main beams is not more than 3.6m;
the I-steel distribution beams are transversely erected on the top surface of the Bailey girder, and the longitudinal distance between each two groups of I-steel distribution beams is not more than 1.5m;
the steel pipe support is erected at the top end of the I-steel distribution beam, and in the steel pipe support, the longitudinal spacing of the steel pipes is 1.5m, and the transverse spacing of the steel pipes is 0.9m.
10. The support structure of claim 9, wherein each set of bailey piece main beams is connected by a transverse connecting rod, diagonal bracing steel bars are welded on the i-steel distribution beams, and the socket type disc buckle steel pipe bracket is connected with the bridge pier by diagonal rods and horizontal rods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| JP2005155080A (en) * | 2003-11-21 | 2005-06-16 | Ps Mitsubishi Construction Co Ltd | Construction method of bridge girder |
| JP2007284914A (en) * | 2006-04-13 | 2007-11-01 | Hokkaido Univ | Rigid-connecting structure of steel girder and pile |
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