CN113605208B - Corrugated steel web PC box girder, internal support external pulling device and construction method of support before lining - Google Patents
Corrugated steel web PC box girder, internal support external pulling device and construction method of support before lining Download PDFInfo
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- CN113605208B CN113605208B CN202110918903.8A CN202110918903A CN113605208B CN 113605208 B CN113605208 B CN 113605208B CN 202110918903 A CN202110918903 A CN 202110918903A CN 113605208 B CN113605208 B CN 113605208B
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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
- 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
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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 a corrugated steel web PC box girder, an internal bracing external-pulling device and a construction method of bracing first and lining later, which comprises a cross supporting plate, wherein the two transverse sides of the cross supporting plate are respectively provided with a right bracing-pulling mechanism and a left bracing-pulling mechanism in a turnover way, and the right bracing-pulling mechanism and the left bracing-pulling mechanism are arranged oppositely and have the same structure; a plurality of adjustable supporting rods are arranged above the cross supporting plate and are arranged between the right supporting and pulling mechanism and the left supporting and pulling mechanism; the bottom surface of the cross supporting plate is provided with a vertical supporting mechanism; the construction method of the invention firstly adopts the foldable internal bracing external pulling device to support the corrugated steel web plate, and the lining concrete is poured after the prestressed tendons of the top and bottom plates reach certain requirements. The internal-supporting external-pulling device of the corrugated steel web PC box girder effectively prevents the corrugated steel web from inward inclining and outward turning, thereby ensuring the construction safety; the construction method of the support before lining can obviously improve the introduction degree of prestress, thereby improving the performance of the whole structure.
Description
Technical Field
The invention belongs to the technical field of bridge construction, relates to corrugated steel web PC box girder construction, and particularly relates to a corrugated steel web PC box girder, an internal support external pulling device and a construction method of supporting first and lining later.
Background
The corrugated steel web box girder consists of an upper concrete flange plate, a lower concrete flange plate and corrugated steel webs on two sides, the corrugated steel webs replace concrete webs to participate in structural stress, axial force is not resisted, prestress loss is reduced, the self weight of a girder body can be effectively reduced, excellent performance is realized in the aspect of structural stress, and meanwhile, the corrugated steel web box girder has the characteristics of convenience in construction, reduction in the use amount of templates and supports and the like. In recent years, the method is applied to a part of domestic bridges.
The corrugated steel web PC box girder mainly has the following characteristics:
(A) The prestress efficiency is improved, and the structural performance is improved. The longitudinal rigidity of the corrugated steel web is small, and the corrugated steel web hardly resists axial force, so that the corrugated steel web is not resisted when prestress is introduced, and longitudinal prestress bundles can be intensively loaded on the top plate and the bottom plate, thereby effectively improving the prestress efficiency;
(B) The use efficiency of the material is improved. In the corrugated steel web PC box girder bridge, concrete is used for bending resistance, the corrugated steel web is used for shearing resistance, the bending moment and the shearing force are respectively borne by the top plate, the bottom plate and the corrugated steel web, and the stress distribution in the web is approximately a uniform distribution pattern rather than a traditional triangle, so that the material can play a role;
(C) The crack of the web is solved, and the durability is good. The common disease of the large-span prestressed concrete box girder bridge is the cracking of a concrete web, and the corrugated steel web with high shearing resistance is used for bearing the shearing force of the box girder bridge, so that the shearing resistance of the prestressed concrete box girder bridge is fundamentally improved, the traditional prestressed concrete box girder bridge is influenced by external force load, concrete shrinkage, creep, material weakening and temperature difference, and cracks are often generated at the web part to cause a series of problems of weakening of the concrete section, corrosion of reinforcing steel bars and the like, so that the common disease of the prestressed concrete box girder bridge is formed, the problems can not be generated on the corrugated steel web PC box girder bridge, and the durability is better;
(D) The corrugated steel web PC box girder bridge can use the corrugated steel web as a temporary facility in the construction process, the corrugated steel web is used as a component of a hanging basket in cantilever casting, the web can be used as a guide beam in pushing construction, a web template can be omitted in cast-in-place, facility cost is saved, a large number of templates, supports and concrete casting projects can be reduced, a complicated process of pre-embedding pipelines in concrete webs is omitted, and the corrugated steel web can be produced in a factory and assembled on site, so that the construction process is accelerated. The length of each construction section can be increased when the cantilever is poured, so that the construction period is shortened;
(E) The self weight is reduced, the span is increased, the lower engineering quantity is reduced, and the anti-seismic performance is improved. The corrugated steel plate has higher shear-resistant buckling capacity, and the concrete web plate with the thickness of 30-80 cm is replaced by the steel plate with the thickness of 10-20 mm without longitudinal and transverse stiffening. The self weight of the box girder can be reduced by 20-30%, the anti-seismic performance is improved, the problem of overlarge mid-span deflection is effectively solved, the using amounts of upper structural concrete, reinforcing steel bars and prestressed reinforcing steel bars are reduced, meanwhile, the lower basic engineering amount is reduced, the engineering cost is reduced by about 10%, and the economic benefit is more obvious;
(F) The appearance is beautiful, the consumption of concrete is reduced, and the low carbon and green environmental protection are realized. The corrugated steel web plate enables the bridge to have strong aesthetic feeling, vivid shape and bright color, is easy to be coordinated with the surrounding environment, and is a good bridge type choice for mountainous areas, scenic areas and urban bridges. Because the consumption of concrete is reduced, the method is low-carbon, green and environment-friendly, and has remarkable social benefit.
A cantilever construction method is generally adopted for the corrugated steel web, and the main construction process comprises the following steps:
(a) Symmetrically mounting corrugated steel webs on the No. 0 block;
(b) After the fixing is finished, mounting a hanging basket on the corrugated steel web plate, and pouring top and bottom plate concrete;
(c) After the concrete meets certain requirements, applying prestress;
(d) And then, gradually lengthening, and finally closing with a beam section poured by the side span support to form a bridge.
At present, the following defects exist in the construction of the corrugated steel web PC box girder: when the span of the PC composite beam bridge with the corrugated steel web exceeds 50m, the height of the beam is 8-9 m, and the height of the corrugated steel web is more than 7m, at the moment, the buckling stability of the corrugated steel web becomes a main control factor of the shear strength. The relevant japanese specifications for corrugated steel web PC composite girder bridges stipulate that a concrete lining should be provided when the beam height is greater than 5m, in order to improve the buckling stability of the corrugated steel web.
In the prior art, in order to ensure the buckling stability of the corrugated steel web, a method of arranging a concrete lining is often adopted, but the arrangement of the concrete lining inevitably causes the increase of the beam weight, reduces the efficiency of prestress, and leads the corrugated steel web PC combined beam bridge to lose the advantages of light weight and high prestress efficiency.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a corrugated steel web PC box girder, an inner support outer pulling device and a construction method of a first support and a second support, and solve the technical problem that the buckling stability and the prestress efficiency of the corrugated steel web are difficult to be considered in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
an inner supporting and outward pulling device of a corrugated steel web PC box girder comprises a cross supporting plate, wherein a right supporting and pulling mechanism and a left supporting and pulling mechanism are respectively installed on the two transverse sides of the cross supporting plate in a turnover mode, and the right supporting and pulling mechanism and the left supporting and pulling mechanism are arranged oppositely and have the same structure; a plurality of adjustable supporting rods are arranged above the cross supporting plate and are arranged between the right supporting and pulling mechanism and the left supporting and pulling mechanism; the bottom surface of the cross supporting plate is provided with a vertical supporting mechanism;
the right supporting and pulling mechanism comprises an upper mounting plate and a lower mounting plate which are oppositely arranged in parallel, a plurality of upper pulling and pressing rods which are arranged in parallel along the transverse direction are mounted on the top surface of the upper mounting plate, the top end of a height adjusting jack is mounted on the bottom surface of the upper mounting plate, and the bottom end of the height adjusting jack is mounted on the top surface of the lower mounting plate; the lower mounting plate is arranged on the cross supporting plate in a turnover mode, and a plurality of transversely arranged pull-down compression rods are arranged on the top surface of the lower mounting plate in parallel along the longitudinal direction;
the adjustable support rod comprises a left adjusting rod, the other transverse end of the left adjusting rod is installed in one transverse end of an adjusting nut, one transverse end of a hollow adjusting screw rod is installed in the other transverse end of the adjusting nut, one transverse end of a joint nut is installed in the other transverse end of the hollow adjusting screw rod, and one transverse end of a right adjusting rod is installed in the other transverse end of the joint nut;
an upper connecting plate is fixedly arranged at the transverse inner end of an upper pull rod of the right stretching mechanism, and a lower connecting plate is fixedly arranged at the transverse inner end of a lower pull rod of the right stretching mechanism; the transverse other end of the right adjusting rod is detachably arranged on an upper connecting plate and/or a lower connecting plate of the right supporting and pulling mechanism, and the transverse end of the left adjusting rod is detachably arranged on an upper connecting plate and/or a lower connecting plate of the left supporting and pulling mechanism;
the bottom surfaces of the lower mounting plates of the right supporting and pulling mechanism and the left supporting and pulling mechanism are respectively hinged with one end of a width adjusting jack, and the other end of the width adjusting jack is hinged on the top surface of the longitudinal fixing plate of the vertical supporting mechanism.
The invention also has the following technical characteristics:
a plurality of mounting plate supporting jacks are arranged between the upper mounting plate and the lower mounting plate,
the vertical supporting mechanism comprises a plurality of H-shaped supporting legs which are oppositely arranged on the bottom surfaces of the two transverse sides of the cross supporting plate; the H-shaped supporting legs comprise a pair of vertical supporting legs hinged on the bottom surface of the cross supporting plate, and a longitudinal fixing plate is longitudinally arranged between the pair of vertical supporting legs; the bottom surface of the longitudinal fixing plate is hinged with one end of a vertical supporting jack, and the other end of the vertical supporting jack is hinged on the bottom surface of the cross supporting plate.
The top end of one longitudinal side of the H-shaped supporting leg is provided with a locator mounting hole, and a locator is mounted in the locator mounting hole; the positioner comprises a positioner spring barrel, one longitudinal end of the positioner spring barrel is open, the other longitudinal end of the positioner spring barrel is closed, and the other longitudinal end of the positioner spring barrel is provided with a mounting column which is mounted in a positioner mounting hole; the positioner is characterized in that a positioning spring is arranged in the positioner spring barrel, one longitudinal end of the positioning spring extends out of the open longitudinal end of the positioner spring barrel and extends into a positioning cavity, the positioning cavity is longitudinally arranged in the side wall of one longitudinal side of the cross supporting plate, and the other longitudinal end of the positioning spring is fixedly arranged in the positioner spring barrel.
The invention also discloses a corrugated steel web PC box girder, which comprises a box girder top plate and a box girder bottom plate which are oppositely arranged in parallel, wherein a pair of corrugated steel webs are vertically arranged between the box girder top plate and the box girder bottom plate;
the installation space of the inner support outer pulling device is used for installing the inner support outer pulling device, and the inner support outer pulling device adopts the inner support outer pulling device of the corrugated steel web PC box girder;
a pair of right fixed supporting mechanisms and a pair of left fixed supporting mechanisms are detachably mounted on the pair of corrugated steel webs respectively, and the right fixed supporting mechanisms and the left fixed supporting mechanisms are arranged oppositely and have the same structure; and the right fixed supporting mechanism and the left fixed supporting mechanism are respectively used for installing a right supporting and pulling mechanism and a left supporting and pulling mechanism.
The right fixed supporting mechanism comprises a plurality of inner supporting members, one transverse side of each inner supporting member is arranged at the other transverse end of the upper tension and compression rod and the other transverse end of the lower tension and compression rod, the other transverse side of each inner supporting member is provided with one transverse side of the inner steel backing plate, and the other transverse side of the inner steel backing plate is arranged on the inner wall of the corrugated steel web plate; an outer steel base plate is arranged opposite to the inner steel base plate, one transverse side of the outer steel base plate is arranged on the outer wall of the corrugated steel web plate, and the other transverse side of the outer steel base plate is sequentially provided with an outer supporting member and an outer fixing nut;
threaded rod through holes are formed in the inner support member, the inner steel backing plate, the corrugated steel web plate, the outer steel backing plate and the outer support member, and threaded rod mounting holes are formed in the outer fixing nuts;
the inner thread holes of the upper pull pressure rod and the lower pull pressure rod are internally provided with one transverse end of a threaded rod, and the other transverse end of the threaded rod sequentially penetrates through threaded rod through holes formed in the inner support member, the inner steel backing plate, the corrugated steel web plate, the outer steel backing plate and the outer support member and is arranged on the corrugated steel web plate through outer fixing nuts.
An inclined strut is arranged on one transverse side of the inner support member;
and gaskets are arranged between the inner support member and the inner steel base plate and between the outer support member and the outer steel base plate.
The invention also discloses a construction method for supporting the corrugated steel web plate PC box girder firstly and then lining, and the method adopts the corrugated steel web plate PC box girder. The method comprises the following specific steps:
step one, constructing a side span main beam:
step 1.1, constructing a pier and a side span main beam;
step 1.2, performing foundation treatment on the pier foundation, and constructing the pier foundation and a pier main body;
step 1.3, arranging a side span support, and constructing a side span main beam on the side span support to finish the construction of the side span main beam;
step two, constructing a box girder bottom plate of the 0# box girder and installing a corrugated steel web plate:
step 2.1, arranging a pier top support, and then performing support pre-pressing;
step 2.2, laying a bottom die, a side die and a core die template at the bottom of the box girder, and binding reinforcing steel bars;
step 2.3, hoisting, positioning and installing the corrugated steel web;
step 2.4, pouring concrete on the bottom die, the side die and the core die template which are laid to complete the construction of the box girder bottom plate;
step three, installing an internal support external pulling device of the corrugated steel web PC box girder:
step 3.1, hoisting preparation:
hoisting the inner support outer pulling device in a folded state to a preset position, starting the vertical support jack and the width adjusting jack, unfolding the right support pulling mechanism, the left support pulling mechanism and the H-shaped support leg, and placing the inner support outer pulling device on a box girder bottom plate;
step 3.2, adjusting the height:
starting the height adjusting jack, and adjusting the height of the upper mounting plate to enable the upper pull-press rod to reach a preset height;
step 3.3, installing a right supporting and pulling mechanism and a left supporting and pulling mechanism:
arranging the inner support member and the inner steel backing plate at preset positions, firstly enabling the threaded rod to penetrate through the corrugated steel web plate, sequentially sleeving the inner support member and the inner steel backing plate on the threaded rod, and then installing the threaded rod in the upper pull-press rod and the lower pull-press rod; after the threaded rod is ensured to be stably connected with the upper pulling and pressing rod and the lower pulling and pressing rod, the outer steel backing plate, the outer supporting member and the outer fixing nut are sleeved on the threaded rod, and the outer fixing nut is screwed down to finish the installation of the upper right pulling and supporting mechanism and the left pulling and supporting mechanism;
step 3.4, installing an adjustable supporting rod:
assembling a left adjusting rod, an adjusting nut and a hollow adjusting screw together, and mounting the assembled left adjusting rod, the adjusting nut and the hollow adjusting screw on an upper connecting plate and a lower connecting plate of a left bracing and pulling mechanism; assembling a joint nut and a right adjusting rod together, installing the joint nut and the right adjusting rod on an upper connecting plate and a lower connecting plate of a right supporting and pulling mechanism after the assembly, adjusting the overall length of an adjustable supporting rod by using an adjusting nut and a hollow adjusting screw rod according to the distance between the right supporting and pulling mechanism and the left supporting and pulling mechanism, and screwing the joint nut and the hollow adjusting screw rod after the length is adjusted to complete the installation of the adjustable supporting rod;
step four, finishing the construction of the 0# block box girder:
step 4.1, laying a template at the top of the box girder, and pouring concrete on the laid template to complete the construction of the box girder top plate;
4.2, tensioning prestressed tendons on a box girder top plate and a box girder bottom plate to complete construction of the 0# box girder;
step five, finishing the construction of the girder of one section:
step 5.1, symmetrically installing hanging baskets on two sides of the 0# block box girder built in the step four;
step 5.2, symmetrically hoisting new corrugated steel webs at two sides of the box girder constructed in the step four, and stably connecting the new corrugated steel webs with the 0# box girder constructed in the step four;
step 5.3, laying a top plate template and a bottom plate template, and pouring top plate concrete and bottom plate concrete;
and 5.4, tensioning the prestressed tendons of the top plate and the bottom plate to complete the construction of the girder of one section.
Step six, repeating the step two to the step five, completing the construction of the girder of a plurality of sections, pouring lining concrete of a 0# box girder after the girder reaches the maximum cantilever state, and completing the construction of all girders;
step seven, dismantling the inner support outer pulling device:
after the outer fixing nut, the outer supporting member and the outer steel base plate are sequentially disassembled, the threaded rod is disassembled, then the inner supporting member and the inner steel base plate are disassembled, and the inner supporting and outer pulling device is disassembled;
step eight, completing full-bridge construction:
and (3) carrying out side span closure, dismantling the side span hanging basket and the construction support after the side span closure is finished, then carrying out mid-span closure, dismantling the closure section hanging basket after the mid-span closure is finished, and finally applying a second-stage load to finish the construction of the full bridge.
Preferably, the method also comprises the following specific steps:
step nine, folding the inner support outer pulling device:
the adjustable supporting rods are firstly detached, the width adjusting jacks retract, the vertical supporting jacks retract after the width adjusting jacks retract to the minimum limit position, and the H-shaped supporting legs, the right supporting and pulling mechanisms and the left supporting and pulling mechanisms are folded after the vertical supporting jacks retract to the minimum limit position, so that the folding of the inner supporting and outer pulling device is completed.
Compared with the prior art, the invention has the following technical effects:
the inner supporting and outer pulling device for the corrugated steel web PC box girder can improve the prestress efficiency by a simple structure, ensures the buckling stability of the corrugated steel web by the right supporting and pulling mechanism and the left supporting and pulling mechanism, and effectively prevents the corrugated steel web from inclining inwards and turning outwards; the vertical supporting mechanism is adopted to ensure the stability of the whole device, thereby ensuring the construction safety.
(II) the internal-support external-pull device of the corrugated steel web PC box girder adopts the width adjusting jack and the adjustable support rod to be matched with each other, so that the overall transverse adjustment of the device is realized; through the height adjusting jack arranged in the right supporting and pulling mechanism and the left supporting and pulling mechanism, the whole vertical adjustment of the device is realized, so that the device has good adaptability to box beams with different widths and different heights, and the convenience of construction is greatly improved.
(III) according to the internal-bracing external-pulling device for the corrugated steel web PC box girder, the adjustable supporting rod, the right fixed supporting mechanism and the left fixed supporting mechanism are detachably mounted, and the right bracing mechanism, the left bracing mechanism and the vertical supporting mechanism can be folded, so that the recycling rate of the device is improved, and the convenience of construction is further improved.
(IV) the internal-support external-pull device of the corrugated steel web PC box girder adopts light high-strength steel as parts, can effectively reduce the dead weight of the traditional lining concrete in the construction stage, and ensures the safety of the structure in the construction stage.
The invention (V) relates to a construction method of a corrugated steel web PC box girder, which comprises the steps of installing an internal-supporting external-pulling device after the pouring of No. 0 box girder bottom plate concrete is finished, ensuring the buckling stability of the corrugated steel web by the internal-supporting external-pulling in the subsequent construction, and then carrying out pier top lining construction after the prestress tensioning is finished. Because the longitudinal displacement of the main beam is not restrained by the internal support and the external tension, the method can obviously improve the prestress introduction degree, and further improve the integral structural performance of the bridge.
Drawings
Fig. 1 is an overall structural schematic diagram of an internal-bracing external-pulling device of a corrugated steel web PC box girder.
Fig. 2 is a schematic diagram of the overall structure of the corrugated steel web PC box girder.
Fig. 3 is a structural schematic diagram of an internal bracing external tension device of a corrugated steel web PC box girder in a folded state.
Fig. 4 is a schematic structural view of the adjustable support rod.
FIG. 5 is a schematic structural view of a vertical support leg.
Fig. 6 is a schematic structural diagram of the positioner.
Fig. 7 is a schematic structural view of the inner support member.
Fig. 8 is a structural schematic view of the outer support member.
The meaning of the individual reference symbols in the figures is: 1-a cross support plate, a right 2-bracing mechanism, a 3-a left bracing mechanism, 4-an adjustable support rod, 5-a vertical support mechanism, 6-a width adjusting jack, 7-a positioner, 8-a positioning cavity, 9-an internal bracing external bracing device installation space, 10-a corrugated steel web PC box girder, 11-a right fixed support mechanism, 12-a left fixed support mechanism, 13-an internal threaded hole and 14-a threaded rod;
201-upper mounting plate, 202-lower mounting plate, 203-upper pull-press rod, 204-height adjusting jack, 205-lower pull-press rod, 206-upper connecting plate, 207-lower connecting plate, 208-mounting plate supporting jack, 209-upper pull-press rod mounting piece, 210-upper limiting hole, 211-lower pull-press rod mounting piece, 212-lower limiting hole;
401-left adjusting rod, 402-adjusting nut, 403-hollow adjusting screw, 404-joint nut, 405-right adjusting rod;
501-H-shaped supporting legs, 502-vertical supporting jacks;
701-locator spring cartridge, 702-mounting post, 703-locating spring;
1001-box girder top plate, 1002-box girder bottom plate, 1003-corrugated steel web;
1101-an inner support member, 1102-an inner steel backing plate, 1103-an outer steel backing plate, 1104-an outer support member, 1105-an outer fixing nut, 1106-a threaded rod through hole, 1107-a threaded rod mounting hole, 1108-a diagonal brace and 1109-a gasket;
50101-vertical supporting leg, 50102-longitudinal fixing plate and 50103-locator mounting hole.
The present invention will be explained in further detail with reference to examples.
Detailed Description
The invention provides a corrugated steel web plate PC box girder, an inner support outer pulling device and a construction method of supporting and lining after first.
All parts in the present invention are those known in the art, unless otherwise specified.
The PC box girder refers to a prestressed concrete box girder.
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Example 1:
the embodiment provides an inner supporting and outward pulling device for a corrugated steel web PC box girder, as shown in fig. 1 to 8, the inner supporting and outward pulling device for the corrugated steel web PC box girder comprises a cross support plate 1, wherein a right supporting and pulling mechanism 2 and a left supporting and pulling mechanism 3 are respectively installed on two transverse sides of the cross support plate 1 in a turnover manner, and the right supporting and pulling mechanism 2 and the left supporting and pulling mechanism 3 are oppositely arranged and have the same structure; a plurality of adjustable support rods 4 are arranged above the cross support plate 1, and the adjustable support rods 4 are arranged between the right supporting and pulling mechanism 2 and the left supporting and pulling mechanism 3; the bottom surface of the cross supporting plate 1 is provided with a vertical supporting mechanism 5;
the right supporting and pulling mechanism 2 comprises an upper mounting plate 201 and a lower mounting plate 202 which are oppositely arranged in parallel, a plurality of upper pulling and pressing rods 203 which are arranged in parallel along the transverse direction are mounted on the top surface of the upper mounting plate 201, the top end of a height adjusting jack 204 is mounted on the bottom surface of the upper mounting plate 201, and the bottom end of the height adjusting jack 204 is mounted on the top surface of the lower mounting plate 202; the lower mounting plate 202 is arranged on the cross support plate 1 in a turnover mode, and a plurality of transversely arranged lower pull-down rods 205 which are arranged in parallel are arranged on the top surface of the lower mounting plate 202 along the longitudinal direction;
the adjustable support rod 4 comprises a left adjusting rod 401, the transverse other end of the left adjusting rod 401 is installed in the transverse end of an adjusting nut 402, the transverse end of a hollow adjusting screw 403 is installed in the transverse other end of the adjusting nut 402, the transverse end of a joint nut 404 is installed in the transverse other end of the hollow adjusting screw 403, and the transverse end of a right adjusting rod 405 is installed in the transverse other end of the joint nut 404;
an upper connecting plate 206 is fixedly arranged at the transverse inner end of an upper pull rod 203 of the right stretching mechanism 2, and a lower connecting plate 207 is fixedly arranged at the transverse inner end of a lower pull rod 205 of the right stretching mechanism 2; the other transverse end of the right adjusting rod 405 is detachably mounted on the upper connecting plate 206 and/or the lower connecting plate 207 of the right supporting and pulling mechanism 2, and one transverse end of the left adjusting rod 401 is detachably mounted on the upper connecting plate 206 and/or the lower connecting plate 207 of the left supporting and pulling mechanism 3;
the bottom surfaces of the lower mounting plates 202 of the right supporting and pulling mechanism 2 and the left supporting and pulling mechanism 3 are respectively hinged with one end of a width adjusting jack 6, and the other end of the width adjusting jack 6 is hinged on the top surface of a longitudinal fixing plate 50102 of the vertical supporting mechanism 5.
In this embodiment, the height adjusting jack 204 is mounted on the upper mounting plate 201 and the lower mounting plate 202 in an articulated manner.
In this embodiment, the bottom of one lateral side of the upper connecting plate 206 is fixedly disposed between the adjacent upper tension/compression bars 203, and the top of the other lateral side of the upper connecting plate 206 is provided with an adjustable support rod 4; the bottom of one transverse side of the lower connecting plate 207 is fixedly arranged between the adjacent lower tension and compression bars 205, and the top of the other transverse side of the lower connecting plate 207 is provided with an adjustable supporting rod 4.
In this embodiment, the two lateral ends of the lower pull rod 205 pass through the lower limiting holes 212 formed in the lower pull rod mounting members 211, and the pair of lower pull rod mounting members 211 are relatively and fixedly arranged on the top surfaces of the two lateral sides of the lower mounting plate 202; the two transverse ends of the upper pulling and pressing rod 203 penetrate through upper limiting holes 210 formed in the upper pulling and pressing rod mounting pieces 209, and the pair of upper pulling and pressing rod mounting pieces 209 are oppositely and fixedly arranged on the top surfaces of the two transverse sides of the upper mounting plate 201.
In this embodiment, one transverse end of the joint nut 404 is in a multi-edge circular truncated cone structure, and the diameter of the transverse end of the joint nut 404 is smaller than the diameter of the transverse end of the joint nut 404.
As a specific solution of this embodiment, a plurality of mounting plate supporting jacks 208 are further disposed between the upper mounting plate 201 and the lower mounting plate 202. In this embodiment, the top end of the mounting plate support jack 208 is mounted on the bottom surface of the upper mounting plate 201, the bottom end of the mounting plate support jack 208 is mounted on the top surface of the lower mounting plate 202, and the mounting plate support jack 208 is mounted in a hinged manner; the mounting plate support jack 208 can ensure that the upper mounting plate 201 and the lower mounting plate 202 are stable in operation.
In this embodiment, the height adjusting jacks 204 are disposed between adjacent lower pull-down levers 205, and the mounting plate supporting jacks 208 are disposed between adjacent height adjusting jacks 204.
As a specific solution of this embodiment, the vertical supporting mechanism 5 includes a plurality of H-shaped supporting legs 501 oppositely disposed on the bottom surfaces of both lateral sides of the cross bracing plate 1; the H-shaped supporting legs 501 comprise a pair of vertical supporting legs 50101 hinged to the bottom surface of the cross supporting plate 1, and a longitudinal fixing plate 50102 is longitudinally arranged between the pair of vertical supporting legs 50101; one end of a vertical supporting jack 502 is hinged to the bottom surface of the longitudinal fixing plate 50102, and the other end of the vertical supporting jack 502 is hinged to the bottom surface of the cross supporting plate 1.
In this embodiment, the vertical support jack 502 has a dual function, the first being to push the folded H-shaped support leg 501 out, and the second being to provide support when the device is in operation.
As a specific scheme of this embodiment, a positioner mounting hole 50103 is formed in the top end of one longitudinal side of the H-shaped support leg 501, and a positioner 7 is installed in the positioner mounting hole 50103; the positioner 7 comprises a positioner spring barrel 701, one longitudinal end of the positioner spring barrel 701 is open, the other longitudinal end of the positioner spring barrel 701 is closed, the other longitudinal end of the positioner spring barrel 701 is provided with a mounting column 702, and the mounting column 702 is mounted in a positioner mounting hole 50103; a positioning spring 703 is arranged in the locator spring cylinder 701, a longitudinal end of the positioning spring 703 extends out of an open longitudinal end of the locator spring cylinder 701 and extends into the positioning cavity 8, the positioning cavity 8 is longitudinally arranged in a side wall on one longitudinal side of the cross support plate 1, and the longitudinal other end of the positioning spring 703 is fixedly arranged in the locator spring cylinder 701.
In this embodiment, the positioner 7 plays a role of limiting the position of the H-shaped support leg 501; when the locator mounting hole 50103 is completely aligned with the locating cavity 8, the locating spring 703 can be ejected out of the open longitudinal end of the locator spring cylinder 701 and extend into the locating cavity 8, so that the positions of the H-shaped support leg 501 and the cross plate 1 are relatively fixed.
Example 2:
the embodiment provides a corrugated steel web PC box girder, as shown in fig. 1 to 8, a corrugated steel web PC box girder 10 comprises a box girder top plate 1001 and a box girder bottom plate 1002 which are oppositely arranged in parallel, a pair of corrugated steel webs 1003 are vertically installed between the box girder top plate 1001 and the box girder bottom plate 1002, and the corrugated steel web PC box girder further comprises an inner supporting and outer pulling device installation space 9, wherein the inner supporting and outer pulling device installation space 9 is arranged between the box girder top plate 1001 and the box girder bottom plate 1002 inside the corrugated steel web PC box girder 10;
the inner support outer pulling device installation space 9 is used for installing an inner support outer pulling device, in the embodiment, the inner support outer pulling device adopts the inner support outer pulling device of the corrugated steel web PC box girder in the embodiment 1;
a pair of right fixed supporting mechanisms 11 and a pair of left fixed supporting mechanisms 12 are detachably mounted on the pair of corrugated steel webs 1003 respectively, and the right fixed supporting mechanisms 11 and the left fixed supporting mechanisms 12 are arranged oppositely and have the same structure; the right fixed supporting mechanism 11 and the left fixed supporting mechanism 12 are respectively used for installing the right supporting and pulling mechanism 2 and the left supporting and pulling mechanism 3.
As a specific solution of this embodiment, the right fixed supporting mechanism 11 includes an inner supporting member 1101, one lateral side of the inner supporting member 1101 is disposed at the other lateral end of the upper pulling-pressing rod 203 and the lower pulling-pressing rod 205, the other lateral side of the inner supporting member 1101 is disposed at one lateral side of an inner steel shim plate 1102, and the other lateral side of the inner steel shim plate 1102 is disposed on the inner wall of the corrugated steel web 1003; an outer steel backing plate 1103 is arranged opposite to the inner steel backing plate 1102, one transverse side of the outer steel backing plate 1103 is arranged on the outer wall of the corrugated steel web 1003, and the other transverse side of the outer steel backing plate 1103 is sequentially provided with an outer supporting member 1104 and an outer fixing nut 1105;
the transverse other ends of the upper pulling pressure rod 203 and the lower pulling pressure rod 205 are internally provided with an internal threaded hole 13, the inner support member 1101, the inner steel backing plate 1102, the corrugated steel web 1003, the outer steel backing plate 1103 and the outer support member 1104 are respectively provided with a threaded rod through hole 1106, and the outer fixing nut 1105 is provided with a threaded rod mounting hole 1107;
the inner threaded holes 13 of the upper pulling and pressing rod 203 and the lower pulling and pressing rod 205 are internally provided with one transverse end of a threaded rod 14, and the other transverse end of the threaded rod 14 sequentially passes through threaded rod through holes 1106 formed in the inner support member 1101, the inner steel backing plate 1102, the corrugated steel web 1003, the outer steel backing plate 1103 and the outer support member 1104 and is arranged on the corrugated steel web 1003 through an outer fixing nut 1105.
In this embodiment, the right fixed supporting mechanism 11 includes an inner supporting member 1101 for fixing and supporting the right supporting mechanism 2 and the left supporting mechanism 3; in this embodiment, the internal thread hole 13 can realize stable connection between the upper pull rod 203 and the lower pull rod 205 and the threaded rod 14.
As a specific solution of this embodiment, a diagonal brace 1108 is disposed on one lateral side of the inner support member 1101; washers 1109 are provided between the inner support member 1101 and the inner steel backing plate 1102 and between the outer support member 1104 and the outer steel backing plate 1103.
In this embodiment, the inclined strut 1108 ensures that the inner support member 1101 is stably connected with the upper pull rod 203 and the lower pull rod 205; the washers 1109 ensure that the inner and outer support members 1101, 1104 are evenly stressed.
Example 3:
the embodiment provides a construction method for supporting a corrugated steel web PC box girder first and then lining, and the method adopts the internal supporting and external pulling device of the corrugated steel web PC box girder in the embodiment 2. The method comprises the following specific steps:
step one, constructing a side span main beam:
step 1.1, constructing a pier and a side span main beam;
step 1.2, performing foundation treatment on the pier foundation, and constructing the pier foundation and a pier main body;
and step 1.3, arranging a side span support, and constructing a side span main beam on the side span support to finish the construction of the side span main beam.
Step two, constructing a box girder bottom plate of the 0# box girder and installing a corrugated steel web plate:
step 2.1, arranging a pier top bracket, and then performing bracket prepressing, wherein in the embodiment, the bracket prepressing is used for eliminating the influence of the inelastic deformation of the foundation and the inelastic deformation of the bracket;
step 2.2, laying a bottom die, a side die and a core die template at the bottom of the box girder, and binding reinforcing steel bars;
step 2.3, hoisting, positioning and installing the corrugated steel web 1003;
and 2.4, pouring concrete on the bottom die, the side die and the core die template which are laid, and finishing the construction of the box girder bottom plate 1002.
Step three, installing an internal support external pulling device of the corrugated steel web PC box girder:
step 3.1, hoisting preparation:
hoisting the inner-supporting outer-pulling device in a folded state to a preset position, starting the vertical supporting jack 502 and the width adjusting jack 6 to unfold the right supporting-pulling mechanism 2, the left supporting-pulling mechanism 3 and the H-shaped supporting leg 501, and placing the inner-supporting outer-pulling device on the box girder bottom plate 1002;
step 3.2, adjusting the height:
starting the height adjusting jack 204, and adjusting the height of the upper mounting plate 201 to enable the upper pull-press rod 203 to reach a preset height; in this embodiment, the preset height of the pull-up and compression rod 203 is set according to the height of the PC box girder 10 with corrugated steel web.
Step 3.3, installing a right supporting and pulling mechanism and a left supporting and pulling mechanism:
arranging the inner support member 1101 and the inner steel backing plate 1102 at preset positions, firstly enabling the threaded rod 14 to penetrate through the corrugated steel web 1003, sequentially sleeving the inner support member 1101 and the inner steel backing plate 1102 on the threaded rod 14, and then installing the threaded rod 14 in the upper pull-press rod 203 and the lower pull-press rod 205; after the threaded rod 14 is ensured to be stably connected with the upper pull-press rod 203 and the lower pull-press rod 205, the outer steel base plate 1103, the outer support member 1104 and the outer fixing nut 1105 are sleeved on the threaded rod 14, and the outer fixing nut 1105 is screwed down to complete the installation of the upper right pull-support mechanism 2 and the left pull-support mechanism 3;
step 3.4, installing an adjustable supporting rod:
assembling a left adjusting rod 401, an adjusting nut 402 and a hollow adjusting screw 403 together, and mounting the assembled left adjusting rod, adjusting nut and hollow adjusting screw on an upper connecting plate 206 and a lower connecting plate 207 of a left supporting and pulling mechanism 3; assembling a joint nut 404 and a right adjusting rod 405 together, installing the assembled joint nut and right adjusting rod on an upper connecting plate 206 and a lower connecting plate 207 of a right supporting and pulling mechanism 2, adjusting the overall length of an adjustable supporting rod 4 by using an adjusting nut 402 and a hollow adjusting screw 403 according to the distance between the right supporting and pulling mechanism 2 and a left supporting and pulling mechanism 3, and screwing the joint nut 404 and the hollow adjusting screw 403 after adjusting the length to complete the installation of the adjustable supporting rod 4; in this embodiment, the adjustment of the transverse length of the adjustable support rod 4 is realized by adjusting the adjusting nut 402 and the hollow adjusting screw 403, so as to ensure that the internal-bracing external-pulling device is adapted to box beams with different widths.
Step four, finishing the construction of the 0# block box girder:
step 4.1, laying a template at the top of the box girder, and pouring concrete on the laid template to complete the construction of the box girder top plate 1001;
and 4.2, tensioning the prestressed tendons on the box girder top plate 1001 and the box girder bottom plate 1002 to complete the construction of the 0# box girder.
Step five, finishing the construction of the girder of one section:
step 5.1, symmetrically installing hanging baskets on two sides of the 0# block box girder built in the step four;
step 5.2, symmetrically hoisting new corrugated steel webs 1003 at two sides of the box girder constructed in the step four, and stably connecting the new corrugated steel webs 1003 with the 0# box girder constructed in the step four;
step 5.3, laying a top plate template and a bottom plate template, and pouring top plate concrete and bottom plate concrete;
and 5.4, tensioning the prestressed tendons of the top plate and the bottom plate to complete the construction of the girder of one section.
And step six, repeating the step two to the step five, completing the construction of the girder of a plurality of sections, pouring lining concrete of the 0# box girder after the girder reaches the maximum cantilever state, and completing the construction of all girders.
Step seven, dismantling the inner support outer pulling device:
after the outer fixing nut 1105, the outer support member 1104 and the outer steel shim plate 1103 are sequentially removed, the threaded rod 14 is removed, and then the inner support member 1101 and the inner steel shim plate 1102 are removed, so that the inner support outer pulling device is removed.
Step eight, completing full-bridge construction:
and (3) carrying out side span closure, dismantling the side span hanging basket and the construction support after the side span closure is finished, then carrying out mid-span closure, dismantling the closure section hanging basket after the mid-span closure is finished, and finally applying a second-stage load to finish the construction of the full bridge.
As a preferable solution of this embodiment, the method further includes the following steps:
step nine, folding the inner support outer pulling device:
demolish adjustable support pole 4, contract width adjusting jack 6, treat that width adjusting jack 6 retracts to minimum limit position after, contract vertical braces jack 502, treat that vertical braces jack 502 retracts to minimum limit position after, folding H type supporting leg 501, right side prop and draw mechanism 2 and left side prop and draw mechanism 3, accomplish the folding of interior propping and draw the device outward, in this embodiment, the fold condition that the interior propping draws the device outward is as shown in fig. 3.
In this embodiment, the restriction of the positioner 7 needs to be released before the H-shaped support leg 501 is folded, and the positioning spring 703 is withdrawn from the positioning cavity 8 by a conventional external force means when the restriction of the positioner 7 is released.
Claims (8)
1. An inner supporting and outward pulling device of a corrugated steel web PC box girder comprises a cross supporting plate (1), and is characterized in that a right supporting and pulling mechanism (2) and a left supporting and pulling mechanism (3) are respectively installed on two transverse sides of the cross supporting plate (1) in a turnover mode, and the right supporting and pulling mechanism (2) and the left supporting and pulling mechanism (3) are oppositely arranged and have the same structure; a plurality of adjustable supporting rods (4) are arranged above the cross supporting plate (1), and the adjustable supporting rods (4) are arranged between the right supporting and pulling mechanism (2) and the left supporting and pulling mechanism (3); the bottom surface of the cross supporting plate (1) is provided with a vertical supporting mechanism (5);
the right supporting and pulling mechanism (2) comprises an upper mounting plate (201) and a lower mounting plate (202) which are oppositely arranged in parallel, a plurality of upper pulling and pressing rods (203) which are arranged in parallel along the transverse direction are mounted on the top surface of the upper mounting plate (201), the top end of a height adjusting jack (204) is mounted on the bottom surface of the upper mounting plate (201), and the bottom end of the height adjusting jack (204) is mounted on the top surface of the lower mounting plate (202); the lower mounting plate (202) is arranged on the cross support plate (1) in a turnover mode, and a plurality of transversely-arranged pull-down compression rods (205) which are arranged in parallel are arranged on the top surface of the lower mounting plate (202) along the longitudinal direction;
the adjustable support rod (4) comprises a left adjusting rod (401), the transverse other end of the left adjusting rod (401) is installed in one transverse end of an adjusting nut (402), one transverse end of a hollow adjusting screw rod (403) is installed in the other transverse end of the adjusting nut (402), one transverse end of a joint nut (404) is installed in the other transverse end of the hollow adjusting screw rod (403), and one transverse end of a right adjusting rod (405) is installed in the other transverse end of the joint nut (404);
the vertical supporting mechanism (5) comprises a plurality of H-shaped supporting legs (501) which are oppositely arranged on the bottom surfaces of the two transverse sides of the cross supporting plate (1); the H-shaped supporting legs (501) comprise a pair of vertical supporting legs (50101) hinged to the bottom surface of the cross supporting plate (1), and a longitudinal fixing plate (50102) is arranged between the pair of vertical supporting legs (50101) along the longitudinal direction; one end of a vertical supporting jack (502) is hinged to the bottom surface of the longitudinal fixing plate (50102), and the other end of the vertical supporting jack (502) is hinged to the bottom surface of the cross supporting plate (1);
an upper connecting plate (206) is fixedly arranged at the transverse inner end of an upper pull-press rod (203) of the right stretching mechanism (2), and a lower connecting plate (207) is fixedly arranged at the transverse inner end of a lower pull-press rod (205) of the right stretching mechanism (2); the other transverse end of the right adjusting rod (405) is detachably arranged on an upper connecting plate (206) and/or a lower connecting plate (207) of the right supporting and pulling mechanism (2), and one transverse end of the left adjusting rod (401) is detachably arranged on the upper connecting plate (206) and/or the lower connecting plate (207) of the left supporting and pulling mechanism (3);
the bottom surfaces of the lower mounting plates (202) of the right supporting and pulling mechanism (2) and the left supporting and pulling mechanism (3) are respectively hinged with one end of a width adjusting jack (6), and the other end of the width adjusting jack (6) is hinged on the top surface of a longitudinal fixing plate (50102) of the vertical supporting mechanism (5).
2. The inner bracing and outer pulling device of the corrugated steel web PC box girder of claim 1, wherein a plurality of mounting plate supporting jacks (208) are further arranged between the upper mounting plate (201) and the lower mounting plate (202).
3. The inner support and outer pulling device for the corrugated steel web PC box girder of claim 1, wherein the top end of one longitudinal side of the H-shaped supporting leg (501) is provided with a locator mounting hole (50103), and a locator (7) is arranged in the locator mounting hole (50103); the positioner (7) comprises a positioner spring cylinder (701), one longitudinal end of the positioner spring cylinder (701) is open, the other longitudinal end of the positioner spring cylinder (701) is closed, the other longitudinal end of the positioner spring cylinder (701) is provided with a mounting column (702), and the mounting column (702) is mounted in a positioner mounting hole (50103); the positioning device is characterized in that a positioning spring (703) is arranged in the positioner spring barrel (701), one longitudinal end of the positioning spring (703) extends out of the open longitudinal end of the positioner spring barrel (701) and extends into a positioning cavity (8), the positioning cavity (8) is longitudinally arranged in the side wall of one longitudinal side of the cross support plate (1), and the other longitudinal end of the positioning spring (703) is fixedly arranged in the positioner spring barrel (701).
4. A corrugated steel web PC box girder comprises a box girder top plate (1001) and a box girder bottom plate (1002) which are arranged in parallel and oppositely, and a pair of corrugated steel webs (1003) are vertically arranged between the box girder top plate (1001) and the box girder bottom plate (1002), and is characterized by further comprising an inner support outer pulling device installing space (9), wherein the inner support outer pulling device installing space (9) is arranged between the box girder top plate (1001) and the box girder bottom plate (1002) inside the corrugated steel web PC box girder (10);
the inner support outer pulling device mounting space (9) is used for mounting the inner support outer pulling device, and the inner support outer pulling device adopts the inner support outer pulling device of the corrugated steel web PC box girder of any one of claims 1 to 3;
a pair of right fixed supporting mechanisms (11) and a pair of left fixed supporting mechanisms (12) are detachably mounted on the pair of corrugated steel webs (1003) respectively, and the right fixed supporting mechanisms (11) and the left fixed supporting mechanisms (12) are arranged oppositely and have the same structure; and the right fixed supporting mechanism (11) and the left fixed supporting mechanism (12) are respectively used for installing the right supporting and pulling mechanism (2) and the left supporting and pulling mechanism (3).
5. The corrugated steel web PC box girder of claim 4, wherein the right fixed supporting mechanism (11) comprises a plurality of inner supporting members (1101), one lateral side of the inner supporting members (1101) is provided at the other lateral ends of the pull-up and pull-down rods (203, 205), the other lateral side of the inner supporting members (1101) is provided with one lateral side of the inner shim plate (1102), and the other lateral side of the inner shim plate (1102) is provided on the inner wall of the corrugated steel web (1003); an outer steel backing plate (1103) is arranged opposite to the inner steel backing plate (1102), one transverse side of the outer steel backing plate (1103) is arranged on the outer wall of the corrugated steel web plate (1003), and the other transverse side of the outer steel backing plate (1103) is sequentially provided with an outer supporting member (1104) and an outer fixing nut (1105);
the transverse other ends of the upper pulling and pressing rod (203) and the lower pulling and pressing rod (205) are internally provided with an internal threaded hole (13), the inner support member (1101), the inner steel backing plate (1102), the corrugated steel web plate (1003), the outer steel backing plate (1103) and the outer support member (1104) are respectively provided with a threaded rod through hole (1106), and the outer fixing nut (1105) is provided with a threaded rod mounting hole (1107);
the novel corrugated steel plate is characterized in that the transverse end of a threaded rod (14) is arranged in an internal threaded hole (13) of the upper pulling and pressing rod (203) and the lower pulling and pressing rod (205), the transverse other end of the threaded rod (14) sequentially penetrates through a threaded rod through hole (1106) formed in an inner supporting member (1101), an inner steel backing plate (1102), a corrugated steel web plate (1003), an outer steel backing plate (1103) and an outer supporting member (1104), and is arranged on the corrugated steel web plate (1003) through an outer fixing nut (1105).
6. The corrugated steel web PC box girder of claim 5, wherein the inner support member (1101) is provided with a cross brace (1108) on one lateral side thereof;
and gaskets (1109) are arranged between the inner support member (1101) and the inner steel base plate (1102) and between the outer support member (1104) and the outer steel base plate (1103).
7. A method for constructing a corrugated steel web PC box girder by using a supporting lining and a lining, which is characterized in that the method adopts the corrugated steel web PC box girder as claimed in claim 5; the method comprises the following specific steps:
step one, constructing a side span main beam:
step 1.1, constructing a pier and a side span main beam;
step 1.2, performing foundation treatment on the pier foundation, and constructing the pier foundation and a pier main body;
step 1.3, arranging a side span support, and constructing a side span main beam on the side span support to finish the construction of the side span main beam;
step two, building a box girder bottom plate of the 0# box girder and installing a corrugated steel web plate:
step 2.1, arranging a pier top support, and then performing support pre-pressing;
step 2.2, laying a bottom die, a side die and a core die template at the bottom of the box girder, and binding reinforcing steel bars;
step 2.3, hoisting, positioning and installing a corrugated steel web plate (1003);
step 2.4, pouring concrete on the bottom die, the side die and the core die template which are laid, and completing the construction of the box girder bottom plate (1002);
step three, installing an internal support external pulling device of the corrugated steel web PC box girder:
step 3.1, hoisting preparation:
hoisting the inner support outer pulling device in a folded state to a preset position, starting a vertical support jack (502) and a width adjusting jack (6) to enable a right support pulling mechanism (2), a left support pulling mechanism (3) and an H-shaped support leg (501) to be unfolded, and placing the inner support outer pulling device on a box girder bottom plate (1002);
step 3.2, adjusting the height:
starting the height adjusting jack (204), and adjusting the height of the upper mounting plate (201) to enable the upper pull-press rod (203) to reach a preset height;
step 3.3, installing a right supporting and pulling mechanism and a left supporting and pulling mechanism:
arranging the inner support member (1101) and the inner steel backing plate (1102) to preset positions, firstly enabling the threaded rod (14) to penetrate through the corrugated steel web (1003), sequentially sleeving the inner support member (1101) and the inner steel backing plate (1102) on the threaded rod (14), and then installing the threaded rod (14) in the upper pull-press rod (203) and the lower pull-press rod (205); after the threaded rod (14) is stably connected with the upper pulling and pressing rod (203) and the lower pulling and pressing rod (205), the outer steel base plate (1103), the outer supporting member (1104) and the outer fixing nut (1105) are sleeved on the threaded rod (14), the outer fixing nut (1105) is screwed down, and the installation of the upper right supporting and pulling mechanism (2) and the left supporting and pulling mechanism (3) is completed;
step 3.4, installing an adjustable supporting rod:
assembling a left adjusting rod (401), an adjusting nut (402) and a hollow adjusting screw (403) together, and mounting the assembled left adjusting rod, the adjusting nut and the hollow adjusting screw on an upper connecting plate (206) and a lower connecting plate (207) of a left bracing and pulling mechanism (3); assembling a joint nut (404) and a right adjusting rod (405) together, installing the assembled joint nut and right adjusting rod on an upper connecting plate (206) and a lower connecting plate (207) of a right supporting and pulling mechanism (2), adjusting the overall length of an adjustable supporting rod (4) by using an adjusting nut (402) and a hollow adjusting screw rod (403) according to the distance between the right supporting and pulling mechanism (2) and a left supporting and pulling mechanism (3), and screwing the joint nut (404) and the hollow adjusting screw rod (403) after adjusting the length to finish the installation of the adjustable supporting rod (4);
step four, finishing the construction of the 0# block box girder:
step 4.1, laying a template at the top of the box girder, and pouring concrete on the laid template to complete the construction of a box girder top plate (1001);
4.2, tensioning prestressed tendons on a box girder top plate (1001) and a box girder bottom plate (1002) to complete construction of the 0# box girder;
step five, finishing the construction of the girder of one section:
step 5.1, symmetrically installing hanging baskets on two sides of the 0# block box girder built in the step four;
step 5.2, symmetrically hoisting new corrugated steel webs (1003) at two sides of the box girder constructed in the step four, and stably connecting the new corrugated steel webs (1003) with the 0# box girder constructed in the step four;
step 5.3, laying a top plate template and a bottom plate template, and pouring top plate concrete and bottom plate concrete;
step 5.4, tensioning the prestressed tendons of the top plate and the bottom plate to complete the construction of a girder of one section;
step six, repeating the step two to the step five, completing the construction of the girder of a plurality of sections, pouring lining concrete of a 0# box girder after the girder reaches the maximum cantilever state, and completing the construction of all girders;
step seven, dismantling the inner support outer pulling device:
after the outer fixing nut (1105), the outer supporting member (1104) and the outer steel base plate (1103) are sequentially disassembled, the threaded rod (14) is disassembled, then the inner supporting member (1101) and the inner steel base plate (1102) are disassembled, and the disassembly of the inner supporting and outer pulling device is completed;
step eight, completing full-bridge construction:
and (3) carrying out side span closure, dismantling the side span hanging basket and the construction support after the side span closure is finished, then carrying out mid-span closure, dismantling the closure section hanging basket after the mid-span closure is finished, and finally applying a second-stage load to finish the construction of the full bridge.
8. The method for constructing the supporting and lining of the corrugated steel web PC box girder as recited in claim 7, wherein the method further comprises the following specific steps:
step nine, folding the inner support outer pulling device:
the adjustable supporting rod (4) is firstly detached, the width adjusting jack (6) retracts, the vertical supporting jack (502) retracts after the width adjusting jack (6) retracts to the minimum limit position, and the H-shaped supporting leg (501), the right supporting and pulling mechanism (2) and the left supporting and pulling mechanism (3) are folded after the vertical supporting jack (502) retracts to the minimum limit position, so that the folding of the inner supporting and outer pulling device is completed.
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| CN202110918903.8A CN113605208B (en) | 2021-08-11 | 2021-08-11 | Corrugated steel web PC box girder, internal support external pulling device and construction method of support before lining |
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| CN202110918903.8A CN113605208B (en) | 2021-08-11 | 2021-08-11 | Corrugated steel web PC box girder, internal support external pulling device and construction method of support before lining |
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| CN213571492U (en) * | 2020-06-22 | 2021-06-29 | 江苏三工钢桥股份有限公司 | Stable in structure's wave form steel web combination case roof beam |
| CN213625170U (en) * | 2020-10-09 | 2021-07-06 | 黑龙江工业学院 | Steel web prestressed concrete box girder |
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2021
- 2021-08-11 CN CN202110918903.8A patent/CN113605208B/en active Active
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