CN113215948A - Assembled combined box girder and construction method thereof - Google Patents
Assembled combined box girder and construction method thereof Download PDFInfo
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- CN113215948A CN113215948A CN202110595977.2A CN202110595977A CN113215948A CN 113215948 A CN113215948 A CN 113215948A CN 202110595977 A CN202110595977 A CN 202110595977A CN 113215948 A CN113215948 A CN 113215948A
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- 238000010276 construction Methods 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 75
- 239000010959 steel Substances 0.000 claims abstract description 75
- 239000004567 concrete Substances 0.000 claims abstract description 17
- 210000002435 tendon Anatomy 0.000 claims abstract description 7
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 5
- 238000005192 partition Methods 0.000 claims description 21
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 1
- 238000005336 cracking Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005452 bending Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 8
- 230000003014 reinforcing effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
- E01D1/00—Bridges in general
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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
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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 provides an assembled combined box girder and a construction method thereof, and belongs to the technical field of bridge engineering construction. The problem of the bottom web cracking of the box girder is solved. The technical scheme is as follows: an assembled combined box girder and a construction method thereof comprise a bottom web plate, a connecting assembly, a diaphragm plate and a top plate; the construction method comprises the following steps: measuring the span between two piers; prefabricating and forming; butting the two bottom webs; inserting the diaphragm plate into the diaphragm plate groove; the joints of the connecting components, the diaphragm plates and the connecting grooves are filled and fixed with mortar; putting the steel bar bundles into the steel bar bundle holes of the clamping blocks; hoisting the top plate to the top of the bottom web plate, aligning the top plate with the steel bar bundle holes of the box girder web plate, placing the steel bar bundles in the box girder web plate, and pouring concrete; and maintaining and tensioning the prestressed tendons. The invention has the beneficial effects that: the invention provides an assembled combined box girder, which replaces an integrated box girder structure by a sectional type connection structure, and the shear stress and the tensile stress of the integrated concrete structure are lower.
Description
Technical Field
The invention relates to the technical field of bridge engineering construction, in particular to an assembled combined box girder and a construction method thereof.
Background
The bridge is used as a structure for smooth traffic of vehicles and other vehicles, the stability and the safety of the bridge are key points of construction, the box girder is one of the girders in bridge engineering, the inside of the box girder is hollow, flanges are arranged on two sides of the upper part of the box girder, and the box girder is similar to a box, so that the name is obtained, and the structural stability of the box girder becomes a key problem in structural design of bridges, industries and civil buildings; the combined box girder has the advantages of good earthquake resistance, high prestress efficiency, convenient construction and the like, and the bridge girder of the type is rapidly developed due to the advantages of excellent structural performance, reasonable comprehensive construction cost and the like. However, most of the existing combined box girders are of reinforced concrete structures, the concrete has poor tensile property, is easy to crack and affects the service life, and the concrete structure has larger dead weight and is not suitable for transportation, thereby affecting the increase of the span of the bridge;
along with the rapid development of the building industry, the requirements on the construction period are more and more strict, the procedures of the combined box girder during the assembly type construction are more complex, the on-site pouring is mostly adopted, the wet operation amount is large, the construction speed is slow, and particularly, the economic benefit is obviously reduced when an urban bridge is constructed;
how to solve the above technical problems is the subject of the present invention.
Disclosure of Invention
The invention aims to provide an assembled combined box girder and a construction method thereof, which can reduce the dead weight of the box girder through a sectional type connection structure, facilitate hoisting, optimize the structural stress and avoid cracking of a bottom web plate of the box girder.
The invention is realized by the following measures: an assembled combined box girder comprises bottom webs, a connecting assembly for connecting two adjacent bottom webs, a diaphragm plate arranged inside the bottom webs and a top plate arranged at the tops of the bottom webs, wherein each bottom web comprises a box girder bottom plate and box girder webs fixedly arranged at two ends of the top of the box girder bottom plate; the sectional type assembling method replaces the original integrated box girder structure, so that the hoisting and splicing are convenient, the adjacent bottom webs are connected through the connecting assembly, the construction process is simplified, and the connection stability is also improved.
The connecting assembly comprises a supporting piece matched with the inside of the bottom web plate and a limiting plate arranged at the top of the supporting piece, the limiting plate comprises a first workpiece, a second workpiece and a third workpiece, the second workpiece and the third workpiece are arranged at two ends of the first workpiece, the second workpiece and the third workpiece are symmetrically arranged relative to the first workpiece, the connecting assembly is symmetrically arranged relative to the central axis of the first workpiece, and the central axis of the first workpiece is perpendicular to the extending direction of the bottom web plate; due to the fact that the combined box girder is large in load, the torque effect of the large load in the component can be resisted through the design of the limiting plate, the box girder has enough tensile strength, and the mechanical property of the box girder is guaranteed.
The inside of end web tip be provided with coupling assembling matched with spread groove, two end webs of adjacent connection, one of them the spread groove of end web tip with one side part cooperation of first work piece axis, wherein another end web tip the spread groove with another side part cooperation of first work piece axis. The connecting grooves are used for connecting two adjacent bottom webs, and the connecting components are symmetrically arranged about the axis of the first workpiece, so that uneven stress can be prevented, and the stability of the connecting structure is ensured.
The box girder web slope sets up, and two box girder webs set up about box girder bottom plate symmetry, coupling assembling's support piece is in including setting up the supporting baseplate and the fixed setting in the bottom the supporting baseplate at supporting baseplate top both ends, the supporting baseplate is on a parallel with the box girder bottom plate, the supporting baseplate is on a parallel with the box girder web, first work piece setting is directly over support piece, second work piece and third work piece are fixed to be set up the top of supporting baseplate, I-shaped structure is constituteed to first work piece, second work piece and third work piece. The first workpiece, the second workpiece and the third workpiece form an I-shaped structure, the bending resistance is better, the first workpiece is narrower than the second workpiece and the third workpiece, when load is applied to the top, the stress in the middle can be dispersed to two sides to two ends of the second workpiece and the third workpiece, the possibility of cracking is reduced, the transverse bearing strength is increased while the weight is reduced by the I-shaped structure, the pressure of the beam body is relieved, and the overall safety is improved by utilizing the characteristic of the I-shaped structure.
The horizontal width of the supporting piece on the connecting assembly is large, the horizontal width of the supporting bottom plate arranged at the bottom is also large, the horizontal width of the supporting piece is large, the pressure applied by the top of the box girder can be well relieved, the horizontal width of the supporting bottom plate is large, the area in contact with the bottom plate of the box girder is also large, the supporting stability is improved, the stress area is also increased, and further the pressure born by the top is relieved.
The connecting groove comprises a supporting piece groove matched with the supporting piece and a baffle arranged on one side of the supporting piece groove. The design of the supporting piece groove enables the bottom web plate to be better jointed with the supporting piece.
Clamping blocks are fixedly arranged at two ends of the second workpiece and the third workpiece, the clamping blocks are perpendicular to the second workpiece and the third workpiece, and the clamping blocks respectively form a T-shaped structure with the second workpiece and the third workpiece; the first workpiece, the second workpiece and the third workpiece form a transverse H-shaped structure, the second workpiece and the third workpiece respectively form a longitudinal H-shaped structure with the clamping blocks at the two ends of the second workpiece and the third workpiece, and the longitudinal H-shaped structure is symmetrical about the first workpiece, so that a longitudinal double H-shaped structure is optimized on the basis of the transverse H-shaped structure, and the advantages of the H-shaped structure mentioned in the content are expanded.
When load is applied to the top of the cross section, bending to the maximum extent can be generated in the middle, the I-shaped structure is compared with a square structure with the same area, the area distribution is very different, the farthest position from the center can bear bending due to the increase of force arms on two sides, namely the bending resistance is the largest, the pressure borne by the central axis can be relieved, the structure provides a secondary pressure intensity dispersing effect, the advantages of the I-shaped structure are enhanced, and the design of the clamping block also provides a structure connected with the baffle.
The baffle can be used to overlap joint piece, provides firm support for the joint piece.
The baffle with the inside fixed connection of end web, the top of baffle with the top parallel and level of end web, the top of baffle seted up with the joint block groove that the joint piece corresponds. The baffle plays a role in reinforcing the lapped clamping blocks, and the clamping block grooves are designed on the baffle, so that the clamping blocks with dispersed pressure are stably supported, and the stability of the structure is ensured;
the joint block is provided with a vertical steel bar bundle hole penetrating through the joint block, and the steel bar bundle hole extends to the bottom of the joint block groove and penetrates through the baffle. The reinforcing steel bar bundles can be placed in the reinforcing steel bar bundle holes to further reinforce the clamping blocks and the baffle plates, so that the overall connection stability is improved.
The side surfaces of two sides of the transverse partition plate are obliquely arranged, and the side surfaces of two sides of the transverse partition plate are matched with the interior of the box girder web plate; the side that the slope set up makes better laminating of diaphragm and case beam web.
A transverse clapboard groove is formed between the support piece groove of the connecting groove and the baffle plate, the depth of the transverse clapboard groove in the vertical direction is greater than that of the support piece groove, and notches corresponding to the second workpiece and the third workpiece are formed on two sides of the transverse clapboard;
when the transverse partition plate is inserted into the transverse partition plate groove, the notch on the transverse partition plate is overlapped on the position between the clamping block and the first workpiece. The depth of the transverse clapboard groove is larger than that of the supporting piece groove, so that the transverse clapboard can be better clamped with the bottom web plate, and the overall stability of the structure is improved.
The middle parts of the diaphragm plate and the baffle are both of hollow structures. The hollow structure is much lighter than solid pouring, and the bearing of the box girder can be greatly reduced.
The top of case beam web offers the reinforcing bar bunch hole of a plurality of along the extending direction linear arrangement of end web, the reinforcing bar bunch hole runs through along the incline direction of case beam web the case beam web, seted up on the roof with the reinforcing bar bunch hole matched with reinforcing bar bunch hole of case beam web. The reinforcing steel bar bundle hole plays a role in further reinforcing.
In order to better achieve the above object, the present invention further provides a construction method of the fabricated combined box girder, comprising the steps of:
s1, measuring and determining the span between two piers, determining the proper length of a bottom web plate, a connecting component, a transverse clapboard and a top plate, prefabricating a bottom web plate with proper length, manufacturing a bottom web plate steel bar binding jig frame, manufacturing the jig frame by adopting angle steel and steel pipes, binding the bottom web plate steel bar frame on the jig frame, installing a corrugated pipe on the bottom web plate steel bar frame, marking on the jig frame according to the coordinates of prestressed steel bundles in a design drawing, positioning the corrugated pipe strictly according to the marks during installation, fixing the corrugated pipe in a groined shape, penetrating an inner lining pipe in the corrugated pipe for supporting to prevent slurry leakage and deformation, reserving a plurality of inclined steel bar bundle holes at the top of the box girder web plate, extending the steel bar bundle holes along the inclined direction of the box girder web plate, pouring bottom web plate concrete, respectively slotting at the two ends of the bottom web plate, manufacturing supporting piece slots, and enabling the bottom of the supporting piece slots to be parallel to the box girder bottom plate, two side walls of the support piece groove are respectively parallel to the two box girder webs, a baffle is arranged on one side of the support piece groove, the bottom and two side surfaces of the baffle are fixed with the bottom web, the top of the baffle is flush with the top plane of the bottom web, clamping block grooves with symmetrical sides are formed in the top of the baffle, a steel bar bundle hole is reserved in the bottom of each clamping block groove, and a groove is formed in the baffle below each clamping block groove to form a hollow structure; offer the horizontal baffle groove between supporting member groove and the baffle, the bottom in horizontal baffle groove is on a parallel with the case roof beam bottom plate, and the both sides in horizontal baffle groove are on a parallel with two case roof beam webs respectively, and the degree of depth in horizontal baffle groove is greater than the degree of depth in supporting member groove, and the width of horizontal baffle groove perpendicular to case roof beam bottom plate direction is greater than the width of supporting member groove perpendicular to case roof beam bottom plate direction.
S2, connecting the components and the diaphragm plate according to the drawing; the bottom of a supporting part of the connecting assembly is designed and manufactured according to the internal size of a supporting part groove, a hollow structure is arranged inside the supporting part, and the outer part of the diaphragm plate is designed and manufactured according to the internal size of the diaphragm plate groove;
s3, after the two bottom webs are hoisted together through a gantry crane, the two box girder bottom plates are flush, the two box girder webs are butted, connecting grooves at the end parts of the two bottom webs are butted together, the connecting assembly is hoisted and inserted into the connecting groove between the two bottom webs, a supporting piece of the connecting assembly is placed in a supporting piece groove, and clamping blocks at the two ends of a second workpiece and a third workpiece are lapped in a clamping block groove at the top of the baffle;
s4, vertically inserting the diaphragm plate into the diaphragm plate groove in the connecting groove, wherein the notch on the diaphragm plate is lapped on the position between the clamping block and the first workpiece; at the moment, the clamping block corresponds to the steel bar bundle hole at the bottom in the clamping block groove up and down;
s5, filling and fixing the gaps at the joints of the connecting components, the diaphragm plates and the connecting grooves by mortar to complete further fixing;
s6, placing the steel bar bundles into the steel bar bundle holes of the clamping blocks, enabling the steel bar bundles to penetrate through the bottom of the clamping block grooves, and pouring concrete to prevent slurry leakage and deformation;
s7, binding a top plate steel bar framework, positioning bridge deck steel bars by using a comb plate, longitudinally controlling the bridge deck steel bars by using angle steel single sides, reserving steel bar bundle holes on an outer die, positioning the steel bar bundle holes corresponding to the steel bar bundle holes reserved on the box girder top plate, enabling the inclination directions of the steel bar bundle holes and the steel bar bundle holes to be consistent, integrally hoisting the top plate to the top of the bottom web plate, aligning the steel bar bundle holes of the top plate and the box girder web plate, placing steel bars in the top plate and pouring concrete;
and S8, performing spray maintenance, tensioning the bottom web plate and the top plate prestressed bundles, grouting and sealing the anchor, and after the main body structure is completed, hoisting the assembled combined box girder to a bridge position by using a crane.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides an assembled combined box girder, which replaces an integrated box girder structure by a sectional type connection structure, and the integrated concrete structure has lower shearing and tensile stress; the supporting bottom plate of the supporting piece is parallel to the box girder bottom plate, the supporting web plate is parallel to the box girder web plate, and the stability of the structure is improved due to the matching of the supporting piece and the supporting piece groove;
(2) all parts do not need to be manufactured on site, can be transported to the site for splicing and hoisting after being manufactured, can be adjusted in size according to the actual requirement of the specification of the bridge, has stronger practicability, greatly improves the construction efficiency on site and reduces the labor intensity;
(3) the connecting parts of the two box girder bottom webs are connected through the connecting assembly, the first workpiece, the second workpiece and the third workpiece form an I-shaped structure, the two ends of the second workpiece and the third workpiece are provided with clamping blocks, so that the two sections of bottom webs can be firmly connected, the transverse partition plate is vertically inserted into a transverse partition plate groove in the connecting groove, and a notch in the transverse partition plate is lapped on the position between the clamping blocks and the first workpiece, so that the connecting stability is further increased, and the hoisting construction is convenient;
(4) the junction of two case beam bottom webs passes through coupling assembling to be connected, also can increase the area of contact between each subassembly, optimizes the structure atress, and the better propagation that reduces vibrations improves the leap ability and the tensile ability of bridge, is showing the fracture probability that reduces combination case roof beam, has prolonged the life of combination case roof beam, has increased the security of using.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention.
Fig. 2 is a schematic view of an overall structure of a hidden top plate according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a connecting assembly according to an embodiment of the invention.
Fig. 4 is a partially enlarged view a of fig. 2.
FIG. 5 is a schematic structural diagram of a diaphragm according to an embodiment of the present invention.
Wherein the reference numerals are: 1. a bottom web; 2. a connecting assembly; 3. a diaphragm plate; 4. a top plate; 101. a box girder bottom plate; 102. a box girder web; 103. a support member slot; 104. a baffle plate; 105. a clamping block slot; 106. a transverse clapboard groove; 201. a first workpiece; 202. a second workpiece; 203. a third workpiece; 204. a support member; 205. a clamping block; 206. and (5) reinforcing steel bar bundle holes.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting.
Example 1
Referring to fig. 1 to 5, the technical solution provided by the present invention is that, the fabricated composite box girder includes a bottom web 1, a connecting assembly 2 connecting two adjacent bottom webs 1, a diaphragm 3 arranged inside the bottom web 1, and a top plate 4 arranged at the top of the bottom web 1, wherein the bottom web 1 includes a box girder bottom plate 101 and box girder webs 102 fixedly arranged at two ends of the top of the box girder bottom plate 101;
the connecting assembly 2 comprises a supporting part 204 matched with the inside of the bottom web 1 and a limiting plate arranged at the top of the supporting part 204, the limiting plate comprises a first workpiece 201, a second workpiece 202 and a third workpiece 203 which are arranged at two ends of the first workpiece 201, the second workpiece 202 and the third workpiece 203 are symmetrically arranged relative to the first workpiece 201, the connecting assembly 2 is symmetrically arranged relative to the central axis of the first workpiece 201, and the central axis of the first workpiece 201 is perpendicular to the extending direction of the bottom web 1;
the inside of the end of the bottom web 1 is provided with a connecting groove matched with the connecting component 2, two bottom webs 1 are adjacently connected, the connecting groove of one end of the bottom web 1 is matched with one side part of the central axis of the first workpiece 201, and the connecting groove of the other end of the bottom web 1 is matched with the other side part of the central axis of the first workpiece 201.
The box girder webs 102 are obliquely arranged, the two box girder webs 102 are symmetrically arranged relative to the box girder bottom plate 101, the supporting part 204 of the connecting assembly 2 comprises a supporting bottom plate arranged at the bottom and supporting webs fixedly arranged at two ends of the top of the supporting bottom plate, the supporting bottom plate is parallel to the box girder bottom plate 101, the supporting webs are parallel to the box girder webs 102, the first workpiece 201 is arranged right above the supporting part 204, the second workpiece 202 and the third workpiece 203 are fixedly arranged at the top of the supporting webs, and the first workpiece 201, the second workpiece 202 and the third workpiece 203 form an I-shaped structure.
The coupling groove includes a supporter groove 103 coupled with the supporter 204 and a baffle plate 104 disposed at one side of the supporter groove 103.
Clamping blocks 205 are fixedly arranged at two ends of the second workpiece 202 and the third workpiece 203, the clamping blocks 205 are perpendicular to the second workpiece 202 and the third workpiece 203, and the clamping blocks 205, the second workpiece 202 and the third workpiece 203 respectively form a T-shaped structure;
baffle 104 and the inside fixed connection of end web 1, the top of baffle 104 and the top parallel and level of end web 1, the joint piece groove 105 that corresponds with joint piece 205 is seted up at the top of baffle 104.
The clamping block 205 is provided with a steel bar bundle hole 206 vertically penetrating through the clamping block 205, and the steel bar bundle hole 206 extends to the bottom of the clamping block groove 105 and penetrates through the baffle 104.
The two side surfaces of the diaphragm plate 3 are obliquely arranged, and the two side surfaces of the diaphragm plate 3 are matched with the interior of the box girder web plate 102;
a transverse clapboard groove 106 is formed between the support piece groove 103 and the baffle plate 104 of the connecting groove, the depth of the transverse clapboard groove 106 in the vertical direction is greater than that of the support piece groove 103, and notches corresponding to the second workpiece 202 and the third workpiece 203 are formed on two sides of the transverse clapboard 3;
when the diaphragm plate 3 is inserted into the diaphragm plate groove 106, the notch on the diaphragm plate 3 is overlapped at a position between the clamping block 205 and the first workpiece 201.
The middle parts of the diaphragm plate 3 and the baffle plate 104 are both provided with hollow structures.
The top of box girder web 102 is provided with a plurality of tendon holes 206 which are linearly arranged along the extending direction of bottom web 1, tendon holes 206 penetrate through box girder web 102 along the inclining direction of box girder web 102, and top plate 4 is provided with tendon holes 206 which are matched with tendon holes 206 of box girder web 102.
In order to better achieve the object of the present invention, this embodiment further provides a construction method of an assembled type combined box girder, which specifically includes the following steps:
s1, measuring and determining the span between two piers, determining the proper length of a bottom web plate 1, a connecting assembly 2, a diaphragm plate 3 and a top plate 4, prefabricating a bottom web plate 1 with proper length, manufacturing a bottom web plate 1 steel bar binding jig frame, manufacturing the jig frame by adopting angle steel and steel pipes, binding the bottom web plate 1 steel bar frame on the jig frame, mounting a corrugated pipe on the bottom web plate 1 steel bar frame, marking the jig frame according to the coordinates of a prestressed steel bundle in a design drawing, positioning the corrugated pipe strictly according to the mark when the corrugated pipe is mounted, fixing the corrugated pipe in a groined shape, penetrating an inner lining pipe in the corrugated pipe for supporting to prevent slurry leakage and deformation, reserving a plurality of inclined steel bar bundle holes at the top of a box girder web plate 101, extending the steel bar bundle holes along the inclined direction of the box girder web plate 101, pouring bottom web plate 1 concrete, respectively slotting at two ends of the bottom web plate 1 to manufacture supporting piece grooves 103, the bottom of a supporting piece groove 103 is parallel to a box girder bottom plate 101, two side walls of the supporting piece groove 103 are respectively parallel to two box girder web plates 102, a baffle plate 104 is arranged on one side of the supporting piece groove 103, the bottom and two side surfaces of the baffle plate 104 are fixed with a bottom web plate 1, the top of the baffle plate is flush with the top plane of the bottom web plate 1, clamping block grooves 105 with two symmetrical sides are formed in the top of the baffle plate 104, reinforcing steel bar bundle holes are reserved in the bottoms of the clamping block grooves 105, and grooves are formed in the baffle plate 104 below the clamping block grooves 105 to form a hollow structure; a transverse partition plate groove 106 is formed between the supporting piece groove 103 and the baffle plate 104, the bottom of the transverse partition plate groove 106 is parallel to the box girder bottom plate 101, two sides of the transverse partition plate groove 106 are respectively parallel to the two box girder web plates 102, the depth of the transverse partition plate groove 106 is greater than that of the supporting piece groove 103, and the width of the transverse partition plate groove 106 in the direction perpendicular to the box girder bottom plate 101 is greater than that of the supporting piece groove 103 in the direction perpendicular to the box girder bottom plate 101;
s2, connecting the connecting component 2 and the diaphragm plate 3 according to a drawing; the bottom of the support part of the connecting assembly 2 is designed and manufactured according to the internal size of the support part groove 103, a hollow structure is arranged inside the support part, and the outer part of the diaphragm plate 3 is designed and manufactured according to the internal size of the diaphragm plate groove 106;
s3, after the two bottom webs 1 are hoisted together through a gantry crane, the two box girder bottom plates 101 are flush, the two box girder webs 102 are butted, the connecting grooves at the end parts of the two bottom webs 1 are butted together, the connecting assembly 2 is hoisted and inserted into the connecting groove between the two bottom webs 1, the supporting piece 204 of the connecting assembly 2 is placed in the supporting piece groove, and the clamping blocks 205 at the two ends of the second workpiece and the third workpiece are lapped in the clamping block groove 105 at the top of the baffle plate 104;
s4, vertically inserting the diaphragm plate 3 into the diaphragm plate groove 106 in the connecting groove, wherein the notch on the diaphragm plate 3 is lapped on the position between the clamping block 105 and the first workpiece; at the moment, the clamping block 205 corresponds to the steel bar bundle hole at the bottom in the clamping block groove up and down;
s5, the connecting assembly 2, the diaphragm plate 3 and the connecting groove are filled and fixed by mortar to complete further fixation;
s6, putting the steel bar bundles into the steel bar bundle holes of the clamping blocks 205, enabling the steel bar bundles to penetrate through the bottom in the clamping block groove 105, and pouring concrete to prevent slurry leakage and deformation;
s7, binding a top plate steel bar framework, positioning bridge deck steel bars by using a comb plate, longitudinally controlling the bridge deck steel bars by using angle steel single sides, reserving steel bar bundle holes on an outer mold, positioning the steel bar bundle holes corresponding to the steel bar bundle holes reserved on the box girder top plate, enabling the inclination directions of the steel bar bundle holes and the box girder top plate to be consistent, integrally hoisting the top plate to the top of the bottom web plate 1, aligning the steel bar bundle holes of the top plate 4 and the box girder web plate 102, putting steel bars into the top plate and pouring concrete;
and S8, carrying out spray maintenance, tensioning the prestress bundles of the bottom web plate 1 and the top plate 4, grouting and sealing the anchor, and hoisting the assembled and molded assembled combined box girder to a bridge position by using a crane after the main body structure is completed.
The working principle of the invention is as follows: according to the span between two piers, a bottom web plate 1 with proper length is prefabricated firstly, a bottom web plate 1 steel bar binding jig frame is manufactured, a bottom web plate 1 steel bar framework is bound on the jig frame, a corrugated pipe is installed on the bottom web plate 1 steel bar framework, a mark is made on the jig frame according to the coordinate of a prestressed steel beam in a design drawing, a lining pipe is penetrated in the corrugated pipe to be supported, slurry leakage and deformation are prevented, a plurality of inclined steel bar bundle holes are reserved at the top of a box girder web plate 101, the steel bar bundle holes extend along the inclined direction of the box girder web plate 102, bottom web plate 1 concrete is poured, two ends of the bottom web plate 1 are respectively grooved, a supporting member groove 103 is manufactured, the bottom of the supporting member groove 103 is parallel to the box girder bottom plate 101, two side walls of the supporting member groove 103 are respectively parallel to the two box girder web plates 102, a baffle plate 104 is arranged at one side of the supporting member groove 103, two side surfaces of the bottom of the baffle plate 104 and two side surfaces are both fixed with the bottom web plate 1, the top of the baffle plate 104 is flush with the top plane of the bottom web plate 1, clamping block grooves 105 which are symmetrical at two sides are formed in the top of the baffle plate 104, reinforcing steel bar bundle holes are reserved in the bottoms of the clamping block grooves 105, and the baffle plate 104 below the clamping block grooves 105 is grooved to form a hollow structure; a transverse partition plate groove 106 is formed between the supporting piece groove 103 and the baffle plate 104, the bottom of the transverse partition plate groove 106 is parallel to the box girder bottom plate 101, two sides of the transverse partition plate groove 106 are respectively parallel to the two box girder web plates 102, the depth of the transverse partition plate groove 106 is greater than that of the supporting piece groove 103, and the width of the transverse partition plate groove 106 in the direction perpendicular to the box girder bottom plate 101 is greater than that of the supporting piece groove 103 in the direction perpendicular to the box girder bottom plate 101; arranging a hollow structure inside the connecting component 2, the diaphragm plate 3 and the supporting component 204 according to a drawing; after the two bottom webs 1 are hoisted together by the gantry crane, the two box girder bottom plates 101 are flush, the two box girder webs 102 are butted, the connecting grooves at the end parts of the two bottom webs 1 are butted together, the connecting assembly 2 is hoisted and inserted into the connecting groove between the two bottom webs 1, the supporting piece 204 of the connecting assembly 2 is placed in the supporting piece groove 103, and the clamping blocks 205 at the two ends of the second workpiece and the third workpiece are lapped in the clamping block groove 105 at the top of the baffle 104; vertically inserting the diaphragm plate 106 into the diaphragm plate groove 106 in the connecting groove, wherein the notch on the diaphragm plate 106 is lapped on the position between the clamping block 205 and the first workpiece; gaps among the connecting parts of the connecting assembly 2, the diaphragm plate 3 and the connecting groove are filled and fixed by mortar, so that further fixation is completed; placing the steel bar bundles into the steel bar bundle holes of the clamping blocks 205, enabling the steel bar bundles to penetrate through the bottom in the clamping block groove 105, and pouring concrete to prevent slurry leakage and deformation; binding a steel bar framework of a top plate 4, reserving steel bar bundle holes on an outer die, positioning the steel bar bundle holes corresponding to the steel bar bundle holes reserved on the top plate of the box girder, enabling the inclination directions of the steel bar bundle holes and the steel bar bundle holes to be consistent, integrally hoisting the top plate 4 to the top of the bottom web plate 1, aligning the steel bar bundle holes of the top plate 4 and the box girder web plate 102, placing steel bars inside and pouring concrete; and (4) carrying out spray maintenance, tensioning the prestressed bundles of the bottom web plate 1 and the top plate 4, grouting and sealing the anchor, and hoisting the assembled combined box girder to the bridge position by using a crane after the main body structure is finished.
The original integrated box girder structure is replaced by a sectional type assembling method, so that the hoisting and splicing are convenient, the adjacent bottom webs 1 are connected through the connecting component 2, the construction process is simplified, and the connection stability is improved;
the first workpiece, the second workpiece and the third workpiece form an I-shaped structure, the bending resistance is better, the first workpiece is narrower than the second workpiece and the third workpiece, when load is applied to the top, the stress in the middle can be dispersed to two sides to two ends of the second workpiece and the third workpiece, the possibility of cracking is reduced, the transverse bearing strength is increased while the weight is reduced by the I-shaped structure, the pressure of the beam body is relieved, and the overall safety is improved by utilizing the characteristic of the I-shaped structure.
The transverse width of the support member 204 on the connecting assembly 2 is larger, and the transverse width of the support bottom plate arranged at the bottom is also larger, so that the pressure applied to the top of the box girder can be well relieved, the contact area with the box girder bottom plate 101 is also larger, the support stability is improved, the stress area is also increased, and the pressure born by the top is further relieved;
the first workpiece, the second workpiece and the third workpiece form a transverse H-shape, the second workpiece and the third workpiece respectively form a longitudinal H-shape with the clamping blocks 205 at the two ends of the second workpiece and the third workpiece, and the longitudinal H-shape is symmetrical about the first workpiece, so that a longitudinal double-H-shaped structure is optimized on the basis of the transverse H-shape, and the advantages of the H-shaped structure mentioned in the above contents are expanded.
When load is applied to the top of the cross section, bending can be conducted to the maximum degree in the middle, the I-shaped structure is quite different in area distribution compared with a square structure with the same area, due to the fact that the force arms on the two sides are increased, the position farthest away from the center can bear bending to the maximum degree, namely bending resistance is the largest, pressure borne by the central axis can be relieved, the structure provides a secondary pressure intensity dispersing effect, and the advantages of the I-shaped structure are enhanced.
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, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides an assembled combination box girder, its characterized in that includes end web (1), connects adjacent two coupling assembling (2) of end web (1), set up at inside cross slab (3) of end web (1) and set up roof (4) at end web (1) top, end web (1) includes box girder bottom plate (101) and fixed box girder web (102) that set up at box girder bottom plate (101) top both ends.
2. The fabricated combination box girder according to claim 1, wherein the connecting assembly (2) comprises a supporting member (204) matched with the inside of the bottom web (1) and a limiting plate arranged on the top of the supporting member (204), the limiting plate comprises a first workpiece (201), a second workpiece (202) and a third workpiece (203) arranged at two ends of the first workpiece (201), the second workpiece (202) and the third workpiece (203) are symmetrically arranged about the first workpiece (201), the connecting assembly (2) is symmetrically arranged about a central axis of the first workpiece (201), and the central axis of the first workpiece (201) is perpendicular to the extending direction of the bottom web (1);
the inside of end web (1) tip be provided with coupling assembling (2) matched with spread groove, web (1) at the bottom of two adjacent connections, one of them the spread groove of end web (1) tip with one side part cooperation of first work piece (201) axis, wherein the spread groove of web (1) tip at the bottom of another with another side part cooperation of first work piece (201) axis.
3. The fabricated composite box girder according to claim 2, wherein the box girder webs (102) are obliquely arranged, two box girder webs (102) are symmetrically arranged about the box girder bottom plate (101), the supporting member (204) of the connecting assembly (2) comprises a supporting bottom plate arranged at the bottom and supporting webs fixedly arranged at both ends of the top of the supporting bottom plate, the supporting bottom plate is parallel to the box girder bottom plate (101), the supporting webs are parallel to the box girder webs (102), the first workpiece (201) is arranged right above the supporting member (204), the second workpiece (202) and the third workpiece (203) are fixedly arranged at the top of the supporting webs, and the first workpiece (201), the second workpiece (202) and the third workpiece (203) form an I-shaped structure.
4. The fabricated sectional box girder of claim 3, wherein the coupling groove comprises a supporter groove (103) coupled with the supporter (204) and a baffle (104) provided at one side of the supporter groove (103).
5. The assembled combined box girder according to claim 3, wherein clamping blocks (205) are fixedly arranged at two ends of the second workpiece (202) and the third workpiece (203), the clamping blocks (205) are perpendicular to the second workpiece (202) and the third workpiece (203), and the clamping blocks (205) respectively form a T-shaped structure with the second workpiece (202) and the third workpiece (203);
baffle (104) with the inside fixed connection of end web (1), the top of baffle (104) with the top parallel and level of end web (1), the top of baffle (104) seted up with joint block groove (105) that joint block (205) correspond.
6. The assembled combined box girder according to claim 5, wherein the clamping blocks (205) are provided with rebar bundle holes (206) vertically penetrating through the clamping blocks (205), and the rebar bundle holes (206) extend to the bottoms of the clamping block grooves (105) and penetrate through the baffle plates (104).
7. The fabricated combined box girder according to claim 6, wherein both side surfaces of the diaphragm (3) are obliquely arranged, and both side surfaces of the diaphragm (3) are internally engaged with the box girder web (102);
a transverse clapboard groove (106) is formed between the support piece groove (103) and the baffle (104) of the connecting groove, the depth of the transverse clapboard groove (106) in the vertical direction is greater than that of the support piece groove (103), and notches corresponding to the second workpiece (202) and the third workpiece (203) are formed in two sides of the transverse clapboard (3);
when the transverse partition plate (3) is inserted into the transverse partition plate groove (106), the notch on the transverse partition plate (3) is overlapped on the position between the clamping block (205) and the first workpiece (201).
8. The fabricated combined box girder according to claim 4, wherein the middle portions of the diaphragms (3) and the baffles (104) are provided as hollow structures.
9. The assembled combined box girder according to claim 6, wherein a plurality of rebar tying holes (206) are formed in the top of the box girder web (102) and are linearly arranged along the extending direction of the bottom web (1), the rebar tying holes (206) penetrate through the box girder web (102) along the inclined direction of the box girder web (102), and the rebar tying holes (206) matched with the rebar tying holes (206) of the box girder web (102) are formed in the top plate (4).
10. A construction method of the fabricated combined box girder based on any one of claims 1 to 9, comprising the following steps:
s1, measuring and determining the span between two piers, determining the proper length of a bottom web plate (1), a connecting assembly (2) and a top plate (3), prefabricating the bottom web plate (1) with the proper length, manufacturing a bottom web plate steel bar binding jig frame, binding a bottom web plate steel bar framework on the jig frame, installing a corrugated pipe on the bottom web plate steel bar framework, marking the jig frame according to the coordinates of a prestressed steel beam in a design drawing, positioning the corrugated pipe strictly according to the mark during installation, fixing the corrugated pipe in a groined shape, penetrating a lining pipe in the corrugated pipe for supporting, pouring bottom web plate concrete, respectively manufacturing connecting grooves at two ends of the bottom web plate (1), manufacturing a support piece groove (103) according to the drawing, and arranging a baffle (104) at one side of the support piece groove (103);
s2, prefabricating and molding the connecting component (2), the diaphragm plate (3) and the top plate (4) according to a drawing;
s3, after the two bottom webs (1) are hoisted together, connecting grooves at the end parts of the two bottom webs (1) are butted together, the connecting assembly (2) is hoisted and inserted into the connecting groove between the two bottom webs, a support piece (204) of the connecting assembly (2) is placed in a support piece groove (103), and clamping blocks (205) at two ends of a second workpiece (202) and a third workpiece (203) are lapped in clamping block grooves (105) at the top of a baffle plate (104);
s4, vertically inserting the diaphragm plate (3) into a diaphragm plate groove (106) in the connecting groove, wherein a notch on the diaphragm plate (3) is lapped on a position between the clamping block (205) and the first workpiece (201);
s5, the connecting assembly (2), the diaphragm plate (3) and the gap at the connecting position of the connecting groove are filled and fixed by mortar;
s6, placing reinforcing steel bars in the reinforcing steel bar bundle holes (206) of the clamping blocks (205), and pouring concrete to prevent slurry leakage and deformation;
s7, hoisting the top plate (4) to the top of the bottom web plate (1), aligning the top plate (4) with the tendon holes (206) of the box girder web plate (102), placing tendons in the top plate and pouring concrete;
and S8, maintaining, tensioning the prestressed beams, sealing the anchors, and hoisting the assembled combined box girder to the bridge position by using a crane.
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| CN115387243A (en) * | 2022-07-25 | 2022-11-25 | 中铁十一局集团有限公司 | Construction method for splicing prefabricated steel box girder cantilevers at positions across roads |
| CN114411522B (en) * | 2022-03-10 | 2024-07-16 | 中交一公局第五工程有限公司 | Assembled combined box girder and construction method thereof |
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Effective date of registration: 20220223 Address after: 100101 zhoujiajing compound, Guanzhuang, Chaoyang District, Beijing Applicant after: CHINA FIRST HIGHWAY ENGINEERING Co.,Ltd. Applicant after: CCCC FIRST HIGHWAY FIFTH ENGINEERING Co.,Ltd. Address before: 226000 Room 3426, Building 3, Jiangcheng R&D Park, 1088 Jiangcheng Road, Sutong Science and Technology Industrial Park, Nantong City, Jiangsu Province Applicant before: JIANGSU XUCHEN TRAFFIC TECHNOLOGY DEVELOPMENT CO.,LTD. |
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