CN111335187A - Construction process for triangular area of open-web rigid frame bridge - Google Patents
Construction process for triangular area of open-web rigid frame bridge Download PDFInfo
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- CN111335187A CN111335187A CN202010217682.7A CN202010217682A CN111335187A CN 111335187 A CN111335187 A CN 111335187A CN 202010217682 A CN202010217682 A CN 202010217682A CN 111335187 A CN111335187 A CN 111335187A
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- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
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Abstract
The invention provides a construction process for a triangular area of a hollow rigid frame bridge, which is characterized in that a suspension casting downward bending steel bundle is distributed in the section of a web plate of an upper chord 1-n beam section, vertical force in suspension casting construction of the upper chord section is provided by the downward bending steel bundle, and balanced cantilever construction can be realized by the section distributed with the downward bending steel bundle, so that the number of supporting upright columns is optimized, the safety risk of construction operation of the (n-1) sections of the supporting upright columns is avoided, the safety guarantee is improved, the construction period is saved, and the stress condition of a complex system in the triangular area is optimized. Only set up the support post support between last quarter, last quarter n ~ m number beam section, go up the quarter and hang before the basket does not cross the stand, inlay in the fixed section of bottom under the movable end, change fixed stand into flexible adjustable support post, avoid hanging the heavy and diverse problems of processes such as basket at the bottom of the basket and conflict and the basket at the bottom of the basket repacking at the bottom of the stand, the wet weight of cast in situ concrete is born by hanging the basket completely, has improved steel pipe stand and has detained the cable atress condition, has improved the whole safe deposit of structure.
Description
Technical Field
The invention belongs to the technical field of construction of an open-web rigid frame bridge, and particularly relates to a construction process for a triangular area of the open-web rigid frame bridge.
Background
Along with the construction of a domestic first-seat main span 290 m-grade hollow rigid frame bridge-north-span river grand bridge, the construction of domestic hollow rigid frame bridges is gradually increased. Under the conditions of feasible technology and allowable construction cost and construction period, the construction process of the bridge open-web triangular area is optimized, the problems of ensuring construction safety, improving construction quality of the sectional beam and the like become the key construction problem of the bridge construction.
The construction method that the upper chord is provided with the fixed supporting upright post and is combined with the hanging basket for suspension casting and the lower chord is provided with the buckle cable to be matched with the hanging basket for suspension casting adopted in the construction process of the first-instance engineering triangular area creates the precedent of bridge construction, each section of the upper chord in the triangular area is constructed by adopting the fixed supporting upright post, the steel consumption is large, and the safety risk in the installation and disassembly process of the upright post is high; when the support upright posts are matched with the hanging baskets for suspension casting, most of the wet weight of cast-in-place concrete is transmitted to the lower chord box girder through the upright posts, higher requirements are provided for the installation quality and stress of the upright posts and the lower chord section buckle cables, and the structural safety risk is increased; during the construction of the upper chord section, the upper chord hanging basket bottom basket is supported in advance by the stand column, the bottom basket needs to be frequently refitted in the forward moving process, and the number of processes is large. The cross operation is many in upper and lower chord box girder construction process, and the structural system is relatively complicated, and upper and lower chord load influence degree each other is high, and the construction control degree of difficulty is big, and the quality controllability is low, and the safety risk is great, and construction cost is higher.
Disclosure of Invention
The invention aims to provide a construction process for a triangular area of a hollow rigid frame bridge, which overcomes the technical problems in the prior art.
Therefore, the technical scheme provided by the invention is as follows:
a construction process for a triangular area of a hollow rigid frame bridge takes a No. 0 beam section as a center, and symmetrically constructs the rest beam sections towards two sides by hanging basket suspension casting, wherein each beam section comprises an upper chord beam section and a lower chord beam section, and the lower chord beam section is constructed earlier than the upper chord beam section by two beam sections in the construction process;
in the construction process of the No. 1-n beam sections, suspension casting is carried out without arranging a support upright post; when n-m number beam sections are constructed, supporting upright post supports are sequentially arranged between upper chord beam sections and lower chord beam sections of different beam sections for pouring, and the buckling cables are tensioned after the lower chord 2-m number beam sections are poured, wherein n is the beam section number of the upright post for the first time, and m is the triangular area intersection beam section number.
And suspended casting bent-down steel bundles 15 are distributed in the web surface of the upper chord No. 1-n beam section.
The construction process of the No. 1-n beam section is as follows:
step 1), an upper chord hanging basket 1 is arranged on an upper chord of a triangular area, a lower chord hanging basket is arranged on a lower chord, after the upper chord hanging basket is assembled on a beam section of No. 0 of the upper chord, a beam section of No. 1 of the upper chord is poured, a prestressed cable is tensioned, then a bottom basket of the lower chord hanging basket is placed to pour a beam section of No. 1 of the lower chord, then the upper chord hanging basket travels to the beam section of No. 1 of the upper chord, and then a beam section of No. 2 of the lower chord is poured;
step 2), buckling and reeving the lower chord No. 2 beam section, tensioning the lower chord No. 2 beam section buckling and reeving, reserving a lower chord cradle bottom basket, assembling the lower chord cradle, and pouring a lower chord No. 3 beam section;
step 3), buckling and reeving the lower chord No. 3 beam section, tensioning the lower chord No. 3 beam section, moving the lower chord hanging basket 2 forwards to pour the lower chord No. 4 beam section, then assembling the upper chord hanging basket bottom basket on the upper chord again, and pouring the upper chord No. 2 beam section;
and 4) repeating the step 3) until the buckling and rope penetrating of the n-numbered beam sections of the lower chord is carried out, then tensioning the buckling and rope penetrating of the n-numbered beam sections of the lower chord, moving the hanging basket of the lower chord forwards to pour the n-numbered beam sections of the lower chord (n +1), and pouring the n-numbered beam sections of the upper chord (n-1).
In the construction process of the n-m beam sections, a supporting upright post is arranged between an upper chord beam section and a lower chord beam section, a movable end of the supporting upright post is embedded in a fixed end before an upper chord hanging basket passes through the upright post, after a certain upper chord beam section is poured, the upper chord hanging basket travels to the upper side of the upper chord beam section, the movable end of the supporting upright post is jacked to the bottom of the upper chord beam section, after the jacking force of the design requirement is reached, the movable end of the supporting upright post is locked, and the pouring of the next upper chord beam section is continued.
The supporting upright post comprises a fixed end and a movable end, wherein the movable end is embedded in the fixed end, a lifting reserved hole is formed in the upper portion of the movable end, an insertion hole is formed in the lower portion of the movable end, a jacking carrying pole beam is arranged in the insertion hole, and a bracket is arranged on the fixed end.
The construction process of the n-m number beam section comprises the following steps:
step 1), the lower chord hanging basket moves forwards to the position above a lower chord (n +1) beam section, a supporting upright post is arranged above a lower chord n beam section, and at the moment, a movable end 8 of the supporting upright post is embedded into a fixed end 7;
step 2), a lower chord (n + 2) beam section is poured, a buckle cable is tensioned, a lower chord hanging basket is moved forwards to the position above the lower chord (n + 2) beam section, then an upper chord hanging basket is moved forwards to the position above an upper chord (n-1) beam section, an upper chord n beam section is poured, and a prestressed beam is tensioned;
step 3) mounting a support upright column above the lower chord (n +1) beam section, and connecting the support upright column with the support upright column of the n beam section by adopting parallel connection and a scissor brace 14;
step 4), constructing a lower chord (n +3) beam section, tensioning a buckle cable, when constructing the lower chord (n +3) beam section, enabling an upper chord hanging basket to travel above the upper chord n beam section, lifting a movable end of a supporting upright post after a bottom basket of the upper chord hanging basket passes through the supporting upright post, jacking the movable end to a designed jacking force by using a jack, welding and fixing the fixed end and the movable end, and then pouring the upper chord (n +1) beam section;
step 5) after the construction is carried out to the beam section of the lower chord (m-1) according to the steps, the bottom basket of the lower chord cradle is temporarily anchored, the main truss is disassembled, the beam section of the upper chord (m-3) is constructed, and then the beam section of the upper chord (m-2) and the beam section of the upper chord (m-1) are sequentially constructed according to the steps;
step 6), after the upper chord hanging basket is poured to complete the upper chord (m-1) beam section, firstly removing the bottom basket of the upper chord hanging basket, and then supporting the supporting upright column below the upper chord (m-1) beam section to the designed jacking force; combining an upper chord hanging basket main truss, a lower chord hanging basket bottom basket and a template, removing the temporary anchoring of the lower chord hanging basket bottom basket, and enabling the lower chord hanging basket to travel to the position above a lower chord (m-1) beam section;
and 7) pouring the m-shaped beam section twice, tensioning the temporary buckle cable after the strength of the first poured concrete reaches 90% of the designed strength, then pouring a second layer of concrete, and tensioning the prestressed tendons to complete construction of the triangular area.
The specific process of installing the support upright column above the lower chord n-shaped beam section in the step 1) is as follows:
after the tower crane hoists the supporting stand column to the position above the corresponding lower chord n-shaped beam section, firstly, accurate positioning is carried out, and after the plane position and the verticality are checked to meet the requirements, the fixed end of the supporting stand column and the embedded steel plate at the top of the corresponding lower chord n-shaped beam section are fixed through temporary spot welding.
And 4) after the middle-upper chord cradle bottom passes through the supporting upright post, the lifting of the movable end is specifically as follows:
the lifting carrying pole beam penetrates into the lifting reserved hole at the movable end of the supporting upright column, lifting steel wire ropes are symmetrically installed on two sides of the lifting carrying pole beam, a chain block is connected onto the lifting steel wire ropes and is lifted by the chain block, the chain block is respectively hung at the rear end of the outer sliding beam of the cradle and the embedded lifting rings at the top of the upper chord beam section, and the lifting steel wire ropes in the box chamber penetrate out through the reserved hole of the upper chord beam section bottom plate.
And 4) after the middle-upper chord cradle bottom passes through the supporting upright post, the specific process of jacking the movable end is as follows:
lifting the movable end, lifting the jack of the jacking carrying pole beam reserved on the movable end out of the top of the fixed end, suspending lifting, inserting the jacking carrying pole beam into the jack, continuously lifting upwards for a certain height, plugging a steel plate at the movable end, placing a jack on a bracket at the fixed end, acting on the jacking carrying pole beam to synchronously jack the movable end to a designed jacking force, and welding and fixing the movable end and the fixed end after temporarily locking the jack.
The invention has the beneficial effects that:
according to the construction process for the triangular area of the hollow rigid frame bridge, the suspension casting downward bending steel bundles are distributed in the web section of the beam section with the number of upper chords of 1-n (n is the number of the beam section for firstly installing the support upright post), the vertical force in suspension casting construction of the upper chord section is provided by the downward bending steel bundles, the section with the downward bending steel bundles can realize balanced cantilever construction, the number of the support upright posts is optimized, the safety risk of construction operation of the support upright posts of the (n-1) sections is avoided, the safety guarantee is improved, the construction period is saved, and the stress condition of a complex system in the triangular area is optimized.
And a support upright post support is arranged between n-m beam sections of the upper chord and the lower chord (m is the number of the intersection section of the triangular area), and the end of the upright post can be freely jacked. Before the upper chord hanging basket does not cross the upright post, the movable end of the supporting upright post is embedded in the bottom fixed section, after the hanging basket of the n-m beam section is finished and has equal strength, the upper chord hanging basket travels to the upper part of the section, the movable end of the upright post below the top section is supported to the bottom of the upper chord beam, after the jacking force meeting the design requirement is reached, the movable section of the upright post is locked, and the next section is continuously poured. Change fixed stand into flexible adjustable support post, avoid hanging the bottom basket of basket and the conflict of stand and hang the numerous and diverse problems of processes such as basket repacking at the bottom of the basket, the wet weight of cast in situ concrete is born by hanging the basket completely, has improved steel pipe stand and detained the cable atress condition, has improved the whole safe deposit of structure.
In the construction process of the beam section, the lower chord is always kept to lead the upper chord by two sections (beam sections), so that the cross operation is avoided, and the safety guarantee is provided; the construction of the staggered sections opens the working surface, and the construction period is also ensured.
In order to make the aforementioned and other objects of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a construction schematic diagram of an upper chord No. 1 beam section and a lower chord No. 1-2 beam section;
FIG. 2 is a construction schematic diagram of a lower chord No. 2 beam section;
FIG. 3 is a schematic construction view of a beam section with a lower chord (n + 1);
FIG. 4 is a schematic construction view of a beam section with a lower chord (n + 1);
FIG. 5 is a schematic construction view of a beam section with a lower chord (n + 2);
FIG. 6 is a schematic view of the start of normal staggered joint construction of the upper and lower chords;
FIG. 7 is a schematic view of the completion of normal staggered joint construction of the upper and lower chords;
FIG. 8 is a schematic view of the arrangement of the bent-down steel bundles;
FIG. 9 is a schematic illustration of the jacking construction of the support columns;
FIG. 10 is a schematic view of the support column after it has been lifted;
FIG. 11 is a schematic representation of the support column after jacking;
FIG. 12 is a schematic view of a buckle traction construction;
FIG. 13 is a schematic diagram of forward movement of a construction hanging basket at a junction section;
fig. 14 is a schematic view of construction and multiple pouring of the junction section.
In the figure:
description of reference numerals:
1. hanging the basket on the upper chord; 2. hanging the basket at the lower chord; 3. a bottom basket of the lower chord hanging basket; 4. supporting the upright post; 5. a jack; 6. a bottom basket of the upper string hanging basket; 7. a fixed end; 8. a movable end; 9. an outer sliding beam of the hanging basket; 10. a chain block; 11. jacking the shoulder pole beam; 12. a jack; 13. a steel plate; 14. a scissor support; 15. bending the steel bundle downwards; 16. temporary buckling ropes; 17. a bracket; 18. hanging rings are embedded in the beam tops of the upper chord beam sections; 19. an upper chord beam section; 20. a lower chord beam section; 21. lifting the shoulder pole beam; 22. a steel plate at the intersection section; 23. constructing a joint; 24. and (4) supporting by an arc-shaped steel plate.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1:
the embodiment provides a construction process of a triangular area of a hollow rigid frame bridge, which comprises the steps of taking a No. 0 beam section as a center, symmetrically constructing other beam sections towards two sides by adopting hanging basket suspension casting, wherein each beam section comprises an upper chord beam section 19 and a lower chord beam section 20, and constructing the lower chord beam section 20 earlier than the two beam sections of the upper chord beam section 19 in the construction process;
in the construction process of the No. 1-n beam sections, suspension casting is carried out without arranging a support upright post; when n-m number beam sections are constructed, the supporting upright posts 4 are sequentially arranged between the upper chord beam section 19 and the lower chord beam section 20 of different beam sections for supporting and pouring, and the lower chord 2-m number beam sections are stretched and fastened after pouring, wherein n is the beam section number of the upright post for first installation, and m is the triangular area intersection beam section number.
The invention only arranges a support upright post 4 support between the upper chord n-m number (m is the number of the intersection section of the triangular area) and the lower chord n-m number (m is the number of the intersection section of the triangular area), and the end of the upright post can be freely jacked. Change fixed stand into flexible adjustable support post 4, the conflict of basket at the bottom of avoiding hanging the basket and stand and the numerous and diverse problems of processes such as basket repacking at the bottom of hanging the basket, the wet weight of cast in situ concrete is born by hanging the basket completely, has improved steel pipe stand and detained the cable atress condition, has improved the whole safe deposit of structure.
Example 2:
on the basis of embodiment 1, the embodiment provides a construction process for a triangular area of a hollow rigid frame bridge, and suspension casting bent-down steel bundles 15 are distributed in web surfaces of upper chord 1-n beam sections. As shown in fig. 8.
The cantilever casting downward bending steel bundles 15 are distributed in the web sections of the beam sections of the upper chord 1-n (n is the beam section number for firstly installing the support upright post 4), vertical force in the cantilever casting construction of the upper chord sections is provided by the downward bending steel bundles 15, the sections distributed with the downward bending steel bundles 15 can realize balanced cantilever construction, the number of the support upright posts is further optimized, the safety risk of the construction operation of the support upright posts of the (n-1) sections is avoided, the safety guarantee is improved, the construction period is saved, and the stress condition of a complex system in a triangular area is optimized.
Example 3:
on the basis of embodiment 1, this embodiment provides a construction process for a triangular area of a hollow rigid frame bridge, and the construction process of the beam sections 1-n is as follows:
step 1), an upper chord hanging basket 1 is arranged on the upper chord of a triangular area, a lower chord hanging basket 2 is arranged on the lower chord of the triangular area, after the upper chord hanging basket 1 is assembled on the upper chord No. 0 beam section, the upper chord No. 1 beam section is poured, a prestressed cable is tensioned, then a lower chord hanging basket bottom basket 3 is placed to pour the lower chord No. 1 beam section, then the upper chord hanging basket 1 travels to the upper chord No. 1 beam section, and then the lower chord No. 2 beam section is poured; as shown in fig. 1;
step 2), buckling and reeving the beam section of the lower chord No. 2, tensioning the buckling and reeving of the beam section of the lower chord No. 2, reserving a bottom basket 3 of the lower chord hanging basket, assembling the lower chord hanging basket 2, and pouring the beam section of the lower chord No. 3; as shown in fig. 2;
step 3), buckling and reeving the lower chord No. 3 beam section, tensioning the lower chord No. 3 beam section, moving the lower chord hanging basket 2 forwards to pour the lower chord No. 4 beam section, then assembling the upper chord hanging basket bottom basket 6 again at the upper chord, and pouring the upper chord No. 2 beam section;
and 4) repeating the step 3) until the buckling and rope penetrating of the n-shaped beam section of the lower chord is carried out, then tensioning the buckling and rope penetrating of the n-shaped beam section of the lower chord, moving the hanging basket 2 of the lower chord forwards to pour the n + 1-shaped beam section of the lower chord (as shown in the figure 3), and pouring the n-shaped beam section of the upper chord (n-1).
And in the step 2), a pier top winch is used for driving the traction cable to buckle and reeve the cable. As shown in fig. 12.
The assembly of the upper chord hanging basket 1 and the lower chord hanging basket 2 is completed by a tower crane, and prepressing operation is required before the construction of the upper chord hanging basket and the lower chord hanging basket 2.
Example 4:
on the basis of embodiment 1, the embodiment provides a construction process for a triangular area of a hollow rigid frame bridge, in the construction process of a number n-m beam section, a support upright post 4 is arranged between an upper chord beam section 19 and a lower chord beam section 20, an upper chord cradle 1 does not cross the upright post, a movable end 8 of the support upright post 4 is embedded in a fixed end 7, after a certain upper chord beam section 19 is poured, the upper chord cradle 1 travels to the upper side of the upper chord beam section 19, the movable end 8 of the support upright post 4 is jacked to the bottom of the upper chord beam section 19, and after the jacking force of the design requirement is reached, the movable end 8 of the support upright post 4 is locked, and the pouring of the lower chord beam section 19 is continued.
The invention adopts the supporting upright post 4 to avoid the problem of conflict between the upright post and the bottom basket; the support column does not bear the wet weight of cast-in-place concrete any longer, the stress condition of the steel tube column and the buckle cable is improved, the quality of a triangular area and the safe construction process are more controllable, and the safe storage of a structural system is improved.
Example 5:
on embodiment 1's basis, this embodiment provides a three angular regions construction technology of formula rigid frame bridge that open to air, support post 4 includes stiff end 7 and expansion end 8, expansion end 8 is embedded in stiff end 7, 8 upper portions of expansion end are equipped with the promotion preformed hole, 8 lower parts of expansion end are equipped with jack 5, be equipped with jacking shoulder pole roof beam 11 in the jack 5, be equipped with bracket 17 on stiff end 7. As shown in fig. 10.
The fixed end 7 and the movable end 8 are both steel pipes. Before the support column 4 is installed, the fixed end 7 and the movable end 8 penetrate through the temporary connection steel plate and the temporary connection hole through the connection bolt to be fixed. During installation, the bottom end of the fixed end 7 of the support upright post 4 is welded with the embedded steel plate of the top plate of the lower chord beam section 20, and then the temporary connecting steel plate between the movable end 8 and the fixed end 7 of the support upright post is removed.
Example 6:
on the basis of embodiment 1, the embodiment provides a construction process for a triangular area of a hollow rigid frame bridge, and the construction process of the n-m beam section comprises the following steps:
step 1), a lower chord hanging basket 2 moves forwards to the position above a lower chord (n +1) beam section, a supporting upright post 4 is installed above the lower chord n beam section, and at the moment, a movable end 8 of the supporting upright post 4 is embedded into a fixed end 7; as shown in fig. 4;
step 2), a lower chord (n + 2) beam section is poured, a buckle cable is tensioned, the lower chord cradle 2 moves forwards to the position above the lower chord (n + 2) beam section, then the upper chord cradle 1 moves forwards to the position above the upper chord (n-1) beam section, an upper chord n beam section is poured, and a prestressed beam is tensioned;
step 3) mounting a support upright post 4 above the lower chord (n +1) beam section, and connecting the support upright post 4 of the n beam section with a cross brace 14 by adopting parallel connection; as shown in fig. 5;
step 4), constructing a lower chord (n +3) beam section, tensioning a buckle cable, when constructing the lower chord (n +3) beam section, enabling an upper chord cradle 1 to travel above the upper chord n beam section, enabling an upper chord cradle bottom basket 6 to pass through a supporting upright post 4, lifting a movable end 8 of the supporting upright post 4, then jacking the movable end 8 to a designed jacking force by using a jack 12, welding and fixing a fixed end 7 and the movable end 8, and then pouring the upper chord (n +1) beam section; as shown in fig. 6;
step 5) after the construction to the beam section of the lower chord (m-1) according to the steps, temporarily anchoring the bottom basket 3 of the lower chord cradle, disassembling the main truss, constructing the beam section of the upper chord (m-3), and then constructing the beam section of the upper chord (m-2) and the beam section of the upper chord (m-1) according to the steps; as shown in fig. 7;
step 6), after the upper chord cradle 1 is poured to complete the upper chord (m-1) beam section, firstly removing the upper chord cradle bottom basket 6, and then supporting the support upright post 4 below the upper chord (m-1) beam section to the designed jacking force; combining a main truss of an upper chord hanging basket 1, a bottom basket 3 of a lower chord hanging basket and a template, releasing the temporary anchoring of the bottom basket 3 of the lower chord hanging basket, and enabling a lower chord hanging basket 2 to travel to the upper part of a beam section of a lower chord (m-1); as shown in fig. 7;
and 7) pouring the m-shaped beam section twice, tensioning the temporary buckle cable 16 after the strength of the first poured concrete reaches 90% of the designed strength, then pouring a second layer of concrete, and tensioning the prestressed tendons to complete construction of the triangular area. As shown in fig. 13 and 14.
In the construction process of the beam section, the lower chord is always kept to lead the upper chord by two sections (beam sections), so that the cross operation is avoided, and the safety guarantee is provided; the construction of the staggered sections opens the working surface, and the construction period is also ensured.
Example 7:
on the basis of embodiment 6, the embodiment provides a construction process for a triangular area of a hollow rigid frame bridge, and the specific process of installing the support upright column 4 above the lower chord n-shaped beam section in step 1) is as follows:
after the tower crane hoists the support column 4 to the position above the corresponding lower chord n-shaped beam section, firstly, accurate positioning is carried out, and after the plane position and the verticality are checked to meet the requirements, the fixed end 7 of the support column 4 and the embedded steel plate at the top of the corresponding lower chord n-shaped beam section are fixed through temporary spot welding.
Before the support column 4 is installed, the fixed end 7 and the movable end 8 penetrate through the temporary connection steel plate and the temporary connection hole through the connection bolt to be fixed. During installation, the bottom end of the fixed end 7 of the support upright post 4 is welded with the embedded steel plate of the top plate of the lower chord beam section 20, and then the temporary connecting steel plate between the movable end 8 and the fixed end 7 of the support upright post is removed.
Example 8:
on the basis of the embodiment 6, the embodiment provides a construction process for a triangular area of a hollow rigid frame bridge, and in the step 4), after the upper chord cradle bottom basket 6 passes through the support upright post 4, the specific lifting process of the movable end 8 is as follows:
a lifting carrying pole beam 21 penetrates into a lifting reserved hole of the movable end 8 of the supporting upright post 4, lifting steel wire ropes are symmetrically arranged on two sides of the lifting carrying pole beam 21, a chain block 10 is connected onto the lifting steel wire ropes and is lifted by the chain block 10, the chain block 10 is respectively suspended at the rear end of the outer sliding beam 9 of the cradle and an embedded lifting ring 18 at the top of the upper chord beam section, and the lifting steel wire ropes in the box chamber penetrate out through a reserved hole of a bottom plate of the upper chord beam section 19. As shown in fig. 9.
During construction, one upper chord beam section 19 is an upper chord box beam and one lower chord beam section 20 is a lower chord box beam.
Example 9:
on the basis of embodiment 6, this embodiment provides a construction process for a triangular space of a hollow rigid frame bridge, and in step 4), after the upper chord cradle bottom basket 6 passes through the support upright post 4, the concrete process of jacking the movable end 8 is as follows:
lifting the movable end 8, lifting the jack 5 of the jacking carrying pole beam 11 reserved on the movable end 8 out of the top of the fixed end 7, pausing lifting, inserting the jacking carrying pole beam 11 into the jack 5, continuously lifting upwards for a certain height, plugging a steel plate 13 at the movable end 8, placing a jack 12 on a bracket 17 of the fixed end 7, acting on the jacking carrying pole beam 11 to synchronously jack the movable end 8 to a designed jacking force, and welding and fixing the movable end 8 and the fixed end 7 after temporarily locking the jack 12. As shown in fig. 11.
Example 10:
the embodiment provides a construction process for a triangular area of a hollow rigid frame bridge, which comprises the following steps:
step 1), an upper chord hanging basket 1 (a set of triangular hanging basket) is arranged at the upper chord of the triangular area, a lower chord hanging basket 2 (a set of inclined climbing type triangular hanging basket) is arranged at the lower chord, after the upper chord hanging basket 1 is assembled on the upper chord beam section 0, the upper chord beam section 1 is poured, a prestressed cable is stretched, then the lower chord hanging basket bottom basket 3 is lowered to pour the lower chord beam section 1, then the upper chord hanging basket 1 travels to the upper chord beam section 1, and then the lower chord beam section 2 is poured. As shown in fig. 1.
Step 2), buckling and reeving the beam section of the lower chord No. 2, tensioning the buckling and reeving of the beam section of the lower chord No. 2, reserving a bottom basket 3 of the lower chord hanging basket, assembling the lower chord hanging basket 2, and pouring the beam section of the lower chord No. 3; as shown in fig. 2.
And 3) buckling and penetrating a cable of the lower chord No. 3 beam section, tensioning the lower chord No. 3 beam section, further tensioning the lower chord No. 3 beam section, moving the lower chord hanging basket 2 forwards to pour a lower chord No. n beam section, further pouring an upper chord No. (n-2) block, tensioning a prestressed cable, constructing an upper chord No. 20 beam section, a lower chord No. 1 beam section and a lower chord No. n + 1 beam section according to the process, and tensioning the lower chord No. n + 1 beam section. As shown in fig. 3.
Step 4), the string hanging basket moves forwards to the position above a lower string (n +1) beam section, and a supporting upright post 4 is installed above the lower string n beam section; the supporting upright 4 is divided into a fixed end 7 and a movable end 8 (the movable end 8 with the top 1.2m range is embedded in the fixed end 7 in advance).
Step 5), a lower chord (n + 2) beam section is poured, a buckle cable is tensioned, the lower chord cradle 2 moves forwards to the position above the lower chord (n + 2) beam section, then the upper chord cradle 1 moves forwards to the position above the upper chord (n-1) beam section, an upper chord n beam section is poured, and a prestressed beam is tensioned; mounting a support upright post 4 below the upper chord (n +1) beam section, and connecting the support upright post 4 of the n beam section with a cross brace 14 by adopting a parallel connection; as shown in fig. 5;
and 6), constructing a lower chord (n +3) beam section, tensioning the buckle cable, and performing the following operations while constructing the lower chord (n +3) beam section: (1) the upper chord hanging basket 1 runs above the upper chord n-shaped beam section and is anchored; (2) lifting the movable end 8 of the upright post below the upper chord n-shaped beam section, installing the movable end 8 to lift the carrying pole beam 11 and the jacks, applying synchronous jacking force to each jack 12 before casting the lower chord concrete, and welding the movable end 8 and the fixed end 7 of the support upright post 4 after temporarily locking; (3) and (5) casting the upper chord (n +1) beam section. As shown in fig. 6.
Step 7) after the construction to the beam section of the lower chord (m-1) according to the steps, temporarily anchoring the bottom basket 3 of the lower chord cradle, disassembling the main truss, constructing the beam section of the upper chord (m-3), and then constructing the beam section of the upper chord (m-2) and the beam section of the upper chord (m-1) according to the steps; as shown in fig. 7;
step 8), after the upper chord cradle 1 is poured to complete the upper chord (m-1) beam section, firstly removing the upper chord cradle bottom basket 6, and then supporting the support upright post 4 below the upper chord (m-1) beam section to the designed jacking force; combining a main truss of an upper chord hanging basket 1, a bottom basket 3 of a lower chord hanging basket and a template, releasing the temporary anchoring of the bottom basket 3 of the lower chord hanging basket, and enabling a lower chord hanging basket 2 to travel to the upper part of a beam section of a lower chord (m-1); as shown in fig. 7;
and 9) taking the m-shaped beam section as an intersection section, and pouring twice. And (3) tensioning the temporary buckle cable 16 after the strength of the cast concrete reaches 90% of the designed strength for the first time, then casting a second layer of concrete, and tensioning the prestressed tendons to complete the construction of the triangular area. As shown in fig. 13, the upper chord hanging basket 1 is moved forward to cast the junction section in two times. As shown in fig. 14, a construction joint 23 of the junction section is provided with a junction section steel plate 22 and an arc-shaped steel plate support 24.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (9)
1. A construction process for a triangular area of a hollow rigid frame bridge is characterized by comprising the following steps: taking the No. 0 beam section as a center, symmetrically constructing the rest beam sections towards two sides by adopting hanging basket suspension casting, wherein each beam section comprises an upper chord beam section (19) and a lower chord beam section (20), and the lower chord beam section (20) is constructed earlier than the upper chord beam section (19) in the construction process;
in the construction process of the No. 1-n beam sections, suspension casting is carried out without arranging a support upright post; when n-m number beam sections are constructed, support columns (4) are sequentially arranged between upper chord beam sections (19) and lower chord beam sections (20) of different beam sections for supporting and pouring, and after the lower chord 2-m number beam sections are poured, buckling cables are tensioned, wherein n is the beam section number of the first installation column, and m is the triangular area intersection beam section number.
2. The process for constructing the triangular area of the open-web rigid frame bridge according to claim 1, wherein the process comprises the following steps: and suspended casting bent-down steel bundles (15) are distributed in the web surface of the upper chord No. 1-n beam section.
3. The construction process of the triangular area of the open-web rigid frame bridge according to claim 1, wherein the construction process of the No. 1-n beam section is as follows:
step 1), an upper chord hanging basket (1) is arranged on an upper chord of a triangular area, a lower chord hanging basket (2) is arranged on a lower chord, after the upper chord hanging basket (1) is assembled on a beam section of No. 0 of the upper chord, a beam section of No. 1 of the upper chord is poured, a prestressed cable is tensioned, a bottom basket (3) of the lower chord hanging basket is placed down to pour a beam section of No. 1 of the lower chord, then the upper chord hanging basket (1) travels to the beam section of No. 1 of the upper chord, and then the beam section of No. 2 of the lower chord is poured;
step 2), buckling and reeving the beam section of the lower chord No. 2, tensioning the buckling and reeving of the beam section of the lower chord No. 2, reserving a bottom basket (3) of the lower chord hanging basket, assembling the lower chord hanging basket (2), and pouring the beam section of the lower chord No. 3;
step 3), buckling and reeving the lower chord No. 3 beam section, tensioning the lower chord No. 3 beam section, casting the lower chord No. 4 beam section by moving the lower chord cradle (2) forwards, then assembling the upper chord cradle bottom basket (6) on the upper chord again, and casting the upper chord No. 2 beam section;
and 4) repeating the step 3) until the buckling and rope penetrating of the n-numbered beam sections of the lower chord are carried out, then the buckling and rope penetrating of the n-numbered beam sections of the lower chord are tensioned, the hanging basket (2) of the lower chord is moved forward to pour the n + 1-numbered beam sections of the lower chord, and the n-1-numbered beam sections of the upper chord are poured.
4. The process for constructing the triangular area of the open-web rigid frame bridge according to claim 1, wherein the process comprises the following steps: in the construction process of the n-m beam section, a supporting upright post (4) is arranged between an upper chord beam section (19) and a lower chord beam section (20), an upper chord hanging basket (1) does not cross the front of the upright post, a movable end (8) of the supporting upright post (4) is embedded in a fixed end (7), after a certain upper chord beam section (19) is poured, the upper chord hanging basket (1) walks to the upper side of the upper chord beam section (19), the movable end (8) of the supporting upright post (4) is jacked to the bottom of the upper chord beam section (19), and after the jacking force of the design requirement is achieved, the movable end (8) of the supporting upright post (4) is locked, and the pouring of the lower chord beam section (19) is continued.
5. The process for constructing the triangular area of the open-web rigid frame bridge according to claim 1, wherein the process comprises the following steps: support post (4) are including stiff end (7) and expansion end (8), expansion end (8) are embedded in stiff end (7), expansion end (8) upper portion is equipped with the promotion preformed hole, expansion end (8) lower part is equipped with jack (5), be equipped with jacking shoulder pole roof beam (11) in jack (5), be equipped with bracket (17) on stiff end (7).
6. The construction process of the triangular area of the open-web rigid frame bridge according to claim 1, wherein the construction process of the n-m beam section comprises the following steps:
step 1), a lower chord hanging basket (2) moves forwards to the position above a lower chord (n +1) beam section, a supporting upright post (4) is installed above the lower chord n beam section, and at the moment, a movable end (8) of the supporting upright post (4) is embedded into a fixed end (7);
step 2), a lower chord (n + 2) beam section is poured, a buckle cable is tensioned, a lower chord hanging basket (2) is moved forwards to the position above the lower chord (n + 2) beam section, then an upper chord hanging basket (1) is moved forwards to the position above an upper chord (n-1) beam section, an upper chord n beam section is poured, and a prestressed beam is tensioned;
step 3), mounting a support upright post (4) above the lower chord (n +1) beam section, and connecting the support upright post (4) with the support upright post (4) of the n beam section by adopting parallel connection and a cross brace (14);
step 4), constructing a lower chord (n +3) beam section, tensioning a buckle cable, lifting a movable end (8) of a supporting upright post (4) after an upper chord cradle (1) travels above the upper chord n beam section while constructing the lower chord (n +3) beam section, lifting the movable end (8) of the supporting upright post (4) after the upper chord cradle bottom basket (6) passes through the supporting upright post (4), lifting the movable end (8) to a designed jacking force by using a jack (12), welding and fixing a fixed end (7) and the movable end (8), and then pouring the upper chord (n +1) beam section;
step 5) after the beam section with the lower chord (m-1) is constructed according to the steps, the bottom basket (3) of the lower chord cradle is temporarily anchored, the main truss is disassembled, the beam section with the upper chord (m-3) is constructed, and the beam section with the upper chord (m-2) and the beam section with the upper chord (m-1) are constructed sequentially according to the steps;
step 6), after the upper chord cradle (1) is poured to complete the upper chord (m-1) beam section, firstly removing the upper chord cradle bottom cradle (6), and then supporting the support upright post (4) below the upper chord (m-1) beam section to design the jacking force; combining a main truss of the upper chord hanging basket (1), a bottom basket (3) of the lower chord hanging basket and a template, releasing the temporary anchoring of the bottom basket (3) of the lower chord hanging basket, and enabling the lower chord hanging basket (2) to travel to the position above a beam section of a lower chord (m-1);
and 7) pouring the m-shaped beam section twice, tensioning the temporary buckle cable (16) after the strength of the first poured concrete reaches 90% of the designed strength, then pouring a second layer of concrete, and tensioning the prestressed tendons to complete the construction of the triangular area.
7. The construction process of the triangular area of the open-web rigid frame bridge according to claim 6, wherein the specific process of installing the support upright column (4) above the lower chord n-shaped beam section in the step 1) is as follows:
after the tower crane hoists the supporting upright column (4) to the position above the corresponding lower chord n-shaped beam section, firstly, accurate positioning is carried out, and after the plane position and the verticality are checked to meet the requirements, the fixed end (7) of the supporting upright column (4) and the embedded steel plate at the top of the corresponding lower chord n-shaped beam section are fixed through temporary spot welding.
8. The construction process of the triangular area of the open-web rigid frame bridge according to claim 6, wherein after the upper chord cradle bottom basket (6) passes through the support upright post (4) in the step 4), the specific lifting process of the movable end (8) is as follows:
the hoisting device is characterized in that a hoisting carrying pole beam (21) penetrates into a hoisting reserved hole of a movable end (8) of a supporting upright post (4), hoisting steel wire ropes are symmetrically installed on two sides of the hoisting carrying pole beam (21), a chain block (10) is connected onto the hoisting steel wire ropes, the hoisting steel wire ropes are hoisted by the chain block (10), the chain block (10) is respectively suspended at the rear end of an outer sliding beam (9) of a cradle and an embedded hoisting ring (18) at the top of an upper chord beam section beam, and the hoisting steel wire ropes in a box chamber penetrate out through a reserved hole of a bottom plate of the upper chord beam section (19).
9. The construction process of the triangular area of the open-web rigid frame bridge according to claim 6, wherein after the upper chord cradle bottom basket (6) passes through the support upright post (4) in the step 4), the specific process of jacking the movable end (8) is as follows:
lifting the movable end (8), lifting the jack (5) of the jacking carrying pole beam (11) reserved on the movable end (8) out of the top of the fixed end (7), suspending lifting, inserting the jacking carrying pole beam (11) in the jack (5), continuously lifting upwards for a certain height, plugging a steel plate (13) at the movable end (8), placing a jack (12) on a bracket (17) at the fixed end (7), acting on the jacking carrying pole beam (11) to synchronously jack the movable end (8) to a designed jacking force, and temporarily locking the jack (12) and then welding and fixing the movable end (8) and the fixed end (7).
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| CN118422598A (en) * | 2024-07-05 | 2024-08-02 | 贵州交通建设集团有限公司 | Integral cast-in-situ construction method for arched girder combined bridge based on hanging basket with hoisting function |
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