CN115142354A - Pre-embedded internal mold for double-pier bridge pouring construction and post-pouring construction process for tie beam - Google Patents

Abstract

The invention relates to a pre-embedded internal mold for double-pier bridge pouring construction and a tie beam post-pouring construction process, which effectively solve the problems of poor tie beam post-pouring associativity, long synchronous pouring construction period and high construction cost; the pre-buried inner die is pre-buried in pier stud concrete when the pier stud is poured to form an umbrella rib-shaped cavity, connecting steel bars are pre-buried when the inner die is pre-buried, a tie beam cavity is communicated with the cavity formed by the inner die when a tie beam is post-poured, and an umbrella rib-shaped anchoring structure anchored in the pier stud is formed at the end part of the tie beam; the construction process of post-pouring of the tie beam is adopted, the long-term stability of connection between the tie beam and the pier stud is guaranteed, and the defect of poor bonding property of new and old concrete is overcome.

Description

Pre-embedded internal mold for double-pier bridge pouring construction and post-pouring construction process for tie beam

Technical Field

The invention relates to the field of bridge construction, in particular to a pre-embedded inner mold for double-pier bridge pouring construction and a post-pouring construction process for a tie beam.

Background

The double pier bridge is also called a double-column pier, which means that two pier columns are arranged at the same longitudinal supporting position of the bridge along the bridge width direction and are mostly used for ultra-wide bridges and ultra-high bridges, one or more horizontal tie beams are often arranged between the ultra-high double pier columns to connect the two pier columns, so that the two pier columns are limited to form a whole, and the stability is improved; the pouring construction of the pier stud with the tie beam is divided into two types:

firstly, the tie beam is poured after the pouring of the pier stud, and the defect of the mode is that the bonding property of the new concrete and the old concrete of the tie beam and the pier stud is poor; to reverse construction method pier construction operation, owing to adopt the mode of punching earlier and pouring the pier and then excavating the earthwork, the tie beam can't cast in situ, can only adopt this kind of post-cast construction mode, post-cast tie beam when the earthwork excavates to the tie beam position, for example application number: CN 201911185322.7; because the stability of the combination of the new concrete and the old concrete is always a difficult technical problem to solve, and the concrete has the characteristics of compression resistance and no tensile strength, the new concrete combination surface between the end surface of the tie beam and the side wall of the pier column has the risk of cracking under the condition that the tie beam bears the tension-compression alternating stress for a long time in the post-pouring mode, and once the concrete cracks, the limiting function of the tie beam is greatly weakened or even lost;

and secondly, a method for synchronously pouring the tie beam and the pier stud is adopted, the tie beam mold cavity communicated with the pier stud mold cavity is built when the pier stud is poured to the height of the tie beam, and then concrete is poured to finish pouring the tie beam and the pier stud at the same time, for example, the application number is as follows: the invention patent of CN201911002742.7, this way tie beam and pier stud are a pouring whole, the tensile strength of tie beam is stable, just because of this reason, except for reverse construction, etc. must adopt the construction mode of post-pouring tie beam, the others are changing to the synchronous pouring method; however, this approach also has corresponding disadvantages: the pouring construction method of the longitudinal structure body comprises creeping formwork construction, slip form construction and turnover construction, the creeping formwork construction and the slip form are small in template using amount, and form removal is not needed in the pouring process, so that the method has the advantages of being fast in construction progress, low in construction cost, low in equipment investment and the like, but only can be applied to pouring of upper and lower equal-section members, when a pier with a tie beam is synchronously poured, due to blocking of the tie beam, slip form construction and creeping formwork construction cannot be used, only turnover construction can be adopted, and turnover construction needs to repeatedly remove a lower template to be connected to an upper template, so that the construction progress is slow, the construction period is long, the template using amount is large, a special template is needed for the tie beam position, and the construction cost is high.

Disclosure of Invention

Aiming at the situation, the invention provides a pre-embedded inner mold for double-pier bridge pouring construction and a post-pouring construction process for a tie beam, aiming at solving the problems of poor post-pouring binding property of the tie beam, long synchronous pouring construction period and high construction cost.

The utility model provides a two mound bridge pouring construction pre-buried centre forms, includes a main section of thick bamboo and a plurality of side section of thick bamboos, and main section of thick bamboo inner seals the outer end uncovered, and side section of thick bamboo both ends are sealed, and it has a plurality of through-holes to open on the terminal surface in the main section of thick bamboo, and a plurality of side section of thick bamboo circumference equipartitions just become fixed contained angle with main section of thick bamboo axis outside the main section of thick bamboo, the laminating of the inner and main section of thick bamboo lateral wall of a side section of thick bamboo, outer end and the outer end parallel and level of a main section of thick bamboo, a rib column structure is constituteed to a plurality of main sections of thick bamboo and side section of thick bamboo.

The inner end of the side cylinder is fixed with the main cylinder through a bolt.

The outer end of each side cylinder is provided with a threaded hole.

A radial cross brace is fixed in the main cylinder.

A tie beam post-pouring construction process of a double-pier bridge pouring construction embedded inner die comprises the following construction steps:

the method comprises the following steps: pouring the pier stud, hoisting a pier stud reinforcement cage to a calibration position, building a pier stud template system, and pouring pier stud concrete section by section from bottom to top;

step two: pre-embedding an inner mold, when a pier stud is poured to a section below the elevation of the bottom of a tie beam, fixing a side cylinder on the outer wall of a main cylinder by using bolts to enable the main cylinder and the side cylinder to form an umbrella rib-shaped inner mold, then pre-embedding the inner mold at the connecting position of the end part of the tie beam and the pier stud, inserting a pre-embedded connecting steel bar into each through hole of the main cylinder and binding and fixing the pre-embedded connecting steel bar with a pier stud reinforcement cage;

step three: additionally planting embedded connecting steel bars, and additionally arranging the embedded connecting steel bars positioned on the periphery of the main cylinder in the projection range of the end face of the tie beam;

step four: continuously pouring pier column concrete to the elevation;

step five: pulling out the internal mold, building a tie beam template, hoisting a tie beam reinforcement cage, and connecting the end part of the tie beam reinforcement with the embedded connecting reinforcement;

step six: pouring the tie beam concrete to the height of the top of the tie beam;

step seven: and after the concrete is solidified, removing the tie beam template to finish post-pouring operation of the tie beam.

And in the second step, before the embedded connecting bars are bound, horizontal transverse bars perpendicular to the embedded connecting bars are bound on the pier column reinforcement cage, and the inner ends of the embedded connecting bars can be bound on the reinforcement cage and can also be bound on the horizontal transverse bars.

In the second step and the third step, the pre-buried connecting steel bars and the through holes are plugged by using foaming glue, the outer end of the main cylinder is plugged by using a bamboo rubber plate or a foam plate, and the threaded holes in the outer end of the side cylinder and the outer ports of all the threaded sleeves are plugged by using plastic films or rubber plugs.

In the second step, an internal thread pipe is embedded in a position lower than the elevation of the bottom of the tie beam, the internal thread pipe is arranged along the radial direction of the pier stud, and when the tie beam template is built in the fifth step, the internal thread pipe is used for installing a bracket and bearing the tie beam template system.

And step five, implanting a micro steel reinforcement cage framework into the cavity formed by each side barrel, binding and fixing the inner end of the framework and the embedded connecting steel bars in the cavity of the main barrel, and binding and fixing the outer end of the framework and the tie beam steel bars.

And fifthly, after the inner die is pulled out, roughening the inner wall of the inner die cavity, then cleaning the hole, and roughening the outer wall of the pier stud at the position combined with the end part of the tie beam.

The invention adopts the construction process of post-pouring of the tie beam, and simultaneously ensures the long-term stability of the connection between the tie beam and the pier stud through the umbrella rib-shaped anchoring structure at the end part of the tie beam, and makes up the defect of poor bonding property of new and old concrete.

Drawings

Fig. 1 is a front sectional view of the inner mold.

Fig. 2 is a right side view of the inner mold.

Fig. 3 is a front sectional view of the inner mold when it is embedded.

Fig. 4 is an enlarged view of the position a in fig. 3.

Figure 5 is a front cross-sectional view of the mold cavity position after inner mold removal.

Figure 6 is a front cross-sectional view of the tie beam steel form and tie beam reinforcement cage in place.

Fig. 7 is an enlarged view of the position B in fig. 6.

Fig. 8 is a front cross-sectional view of the tie beam after it has been cast.

In the above figures, 1-main cylinder, 2-side cylinder, 3-through hole, 4-bolt, 5-threaded hole, 6-cross brace, 7-pier column reinforcement cage, 8-pier column template, 9-pier column concrete, 10-embedded connecting reinforcement, 11-threaded sleeve, 12-beam template, 13-beam reinforcement cage, 14-horizontal cross reinforcement, 15-internal threaded pipe, 16-bracket, 17-supporting beam, 18-micro reinforcement cage skeleton, and 19-beam concrete.

Detailed Description

The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.

The inner mold comprises a main cylinder 1 and a plurality of side cylinders 2, the inner end of the main cylinder 1 is closed, the outer end of the main cylinder is open, the two ends of each side cylinder 2 are closed, the main cylinder 1 is radially arranged on a pier stud reinforcement cage 7 along a pier stud before the pier stud is poured to the height of the tie beam, the opening of the main cylinder 1 faces outwards, a plurality of through holes 3 are formed in the inner end face of the main cylinder 1, embedded connecting reinforcements 10 penetrate into the through holes 3, the inner ends of the embedded connecting reinforcements 10 are bound and fixed with the pier stud reinforcement cage 7, and the outer ends of the embedded connecting reinforcements penetrate into the main cylinder 1 and are connected with the tie beam reinforcement when the tie beam is to be poured; a plurality of 2 circumference equipartitions of side section of thick bamboo are outside main section of thick bamboo 1 and become fixed contained angle with main section of thick bamboo 1 axis, and the inner and the laminating of 1 lateral wall of main section of thick bamboo of side section of thick bamboo 2, outer end and the outer end parallel and level of main section of thick bamboo 1, after pier stud template 8 of tie beam position takes one's place, the laminating of template inner wall and main section of thick bamboo 1 and the outer end of a plurality of side section of thick bamboo 2, a plurality of main section of thick bamboo 1 and side section of thick bamboo 2 constitution rib structure, behind the concreting, main section of thick bamboo 1 and side section of thick bamboo 2 position formation rib's cavity.

The inner end of the side cylinder 2 is fixed with the main cylinder 1 through the bolt 4, after the inner end of the side cylinder 2 is attached to the main cylinder 1, the bolt 4 is screwed up from the inside of the main cylinder 1 to fix the side cylinder 2 and the main cylinder 1, and therefore it is guaranteed that the side cylinder 2 cannot shift when concrete is poured.

Each outer end of the side cylinder 2 is provided with a threaded hole 5, and during form removal, a bolt 4 pull ring is screwed in the threaded hole 5, so that the side cylinder 2 is conveniently pulled out of concrete to complete the form removal.

A radial cross brace 6 is fixed in the main cylinder 1, and the embedded connecting steel bars 10 are bound and fixed with the cross brace 6, so that the position of the main cylinder 1 is completely fixed and cannot be displaced, and in the other invention, the main cylinder 1 can be easily pulled out of concrete through the cross brace 6 during form removal.

The method for performing pier column pouring and beam tying post-pouring construction by using the internal mold comprises the following steps:

the method comprises the following steps: pouring the pier stud, hoisting the pier stud reinforcement cage 7 to a calibration position, strictly controlling the axis position and the verticality of the central line, erecting a pier stud template 8 system at the bottom of the pier stud, wherein the template system is unlimited and can be constructed by adopting creeping formwork, sliding formwork and turning formwork, after brushing a release agent on the template and positioning, checking the position, the elevation and the horizontal stability of the template, pouring pier stud concrete 9 section by section from bottom to top after the template is qualified, and the single pouring height of the pier stud is not more than two meters; when pouring, using an inserted vibrating rod to carry out vibration compaction, wherein the vibration is carried out on the reinforcing steel bars in a forbidden insertion mode, the distance between the vibrating rod and a template is kept between 5 and 10 cm, and the mark of the vibration compaction is that the concrete does not collapse any more, no bubbles emerge, and the surface is flat and is full of slurry;

step two: pre-embedding an internal mold, when a pier stud is poured to a section below the elevation of the bottom of a tie beam, fixing a side tube 2 on the outer wall of a main tube 1 by using a bolt 4 to enable the main tube 1 and the side tube 2 to form an umbrella rib-shaped internal mold, and then pre-embedding the internal mold at the connecting position of the end part of the tie beam and the pier stud; specifically, after the inner mold is assembled, an embedded connecting steel bar 10 is inserted into each through hole 3 in the bottom of the main cylinder 1, a threaded sleeve 11 is installed at the outer end of each embedded connecting steel bar 10 and used for being connected with a tie beam steel bar subsequently, then the main cylinder 1 is hoisted to a calibration position, a cylinder opening faces outwards and is flush with the inner wall of the pier stud template 8, and in order to be attached to the inner wall of the pier stud template 8, the outer ends of the main cylinder 1 and the side cylinders 2 are all intersecting lines intersecting with the inner wall of the pier stud template 8; then adjusting the position of the embedded connecting steel bars 10 to ensure that the outer ends of the threaded sleeves 11 do not extend out of the openings of the main cylinders 1, then binding and fixing the inner ends of the embedded connecting steel bars 10 with the pier stud reinforcement cage 7, and then binding and fixing the embedded connecting steel bars 10 attached to the cross braces 6 with the cross braces 6;

step three: additionally planting embedded connecting steel bars 10, and additionally arranging the embedded connecting steel bars 10 positioned on the periphery of the main cylinder 1 in the projection range of the end face of the tie beam; the inner end of the embedded connecting steel bar 10 is bound and fixed with the pier stud steel bar cage 7, the outer end of the embedded connecting steel bar is provided with a threaded sleeve 11, and the outer end of the threaded sleeve 11 is flush with the inner wall of the pier stud template 8 and is used for being connected with the tie beam steel bar subsequently;

step four: continuously pouring pier column concrete 9 to the elevation; after the inner mold is fixed in place, coating a release agent on the outer wall of the inner mold, then continuously pouring pier stud concrete 9 to the top elevation position of the pier stud, and after solidification, removing the mold to complete the pouring operation of the pier stud;

step five: pulling out the internal mold, building a tie beam template 12, hoisting a tie beam reinforcement cage 13, and connecting the end part of the tie beam reinforcement with the embedded connecting reinforcement 10; before post-pouring the tie beam, firstly pulling out the inner mold, and the specific method comprises the following steps: screwing down a bolt 4 from the main cylinder 1, detaching the connection between the main cylinder 1 and the side cylinder 2, then detaching the binding of the embedded connecting steel bars 10 and the cross braces 6, pulling out the main cylinder 1 through the cross braces 6, and screwing up a pull ring on a threaded hole 5 at the outer end of the side cylinder 2 to pull out the side cylinders 2 one by one; after the internal mold is removed, a tie beam template 12 is built at a calibration position, a steel reinforcement cage of a tie beam is hoisted in place, a release agent is coated on the template, the position, the elevation and the stability of the template are checked, and two ends of the tie beam steel bar are respectively connected with threaded sleeves 11 at the ends of embedded connecting steel bars 10 in pier columns at two ends;

step six: pouring the tie beam concrete 19 to the height of the top of the tie beam; when in pouring, the vibrating rod is vibrated by the inserting vibrating rod, and the vibrating rod is inserted into the reserved cavity at the position of the main cylinder 1 to vibrate, so that the concrete in the reserved cavity of the inner mold is also vibrated compactly;

step seven: and after the concrete is solidified, removing the tie beam template 12 to finish post-pouring operation of the tie beam.

In step two, before the pre-buried connecting bars 10 are bound, horizontal transverse bars 14 perpendicular to the pre-buried connecting bars 10 are bound on the pier stud reinforcement cage 7, the inner ends of the pre-buried connecting bars 10 can be bound on the reinforcement cage, and can also be bound on the horizontal transverse bars 14, so that the phenomenon that the pre-buried connecting bars 10 cannot be bound with the main bars of the pier stud reinforcement cage 7 at a far distance is avoided.

In the second step and the third step, the pre-buried connecting steel bars 10 and the through holes 3 are plugged by using foaming glue, the outer end of the main cylinder 1 is plugged by using a bamboo rubber plate or a foam plate, and the threaded holes 5 at the outer end of the side cylinder 2 and the outer ports of all the threaded sleeves 11 are plugged by using plastic films or rubber plugs, so that concrete is prevented from entering the inner die cavity.

In the second step, an internal thread pipe 15 is embedded at a position lower than the bottom elevation of the tie beam, the internal thread pipe 15 is arranged along the radial direction of the pier stud, and when the tie beam template 12 is built in the fifth step, the internal thread pipe 15 is used for installing a bracket 16 and bearing the tie beam template 12 system; the inner end of the internal threaded pipe 15 is welded, fixed and closed with the pier stud reinforcement cage 7, the outer end of the internal threaded pipe is 3-5 cm away from the inner wall of the pier stud template 8, before concrete is poured in the fourth step, the outer end of the internal threaded pipe 15 is plugged by a rod-shaped object, the outer end of the rod-shaped object is flush with the inner wall of the pier stud template 8, so that the internal threaded pipe 15 is completely embedded into a pier stud, when the tie beam template 12 is built in the fifth step, the columnar plug at the outer end of the internal threaded pipe 15 is pulled out, the screw rod is screwed with the internal threaded pipe 15, the bracket 16 is fixed on the screw rod by a nut, then the support beam 17 is fixed on the bracket 16, and the tie beam template 12 is built on the support beam 17; and seventhly, after the tie beam template 12 is removed, the bracket 16 is removed, concrete grout is poured into the internal thread pipe 15 for plugging, and the external end of the internal thread pipe 15 does not extend to the surface of the pier stud, so that the internal thread pipe 15 is completely buried in the pier stud, the external leakage and the corrosion are avoided, and the integrity of the external vertical surface of the pier stud is ensured.

In the fifth step, a micro steel reinforcement cage framework 18 is implanted into the cavity formed by each side barrel 2, the inner end of the framework is bound and fixed with the embedded connecting steel bars 10 in the cavity of the main barrel 1, and the outer end of the framework is bound and fixed with the tie beam steel bars.

In the fifth step, after the inner die is pulled out, the inner wall of the inner die cavity is roughened, then the hole is cleaned, and the outer wall of the pier column at the position combined with the end part of the tie beam is roughened, so that the combination firmness of new and old concrete is improved.

The invention adopts the construction process of post-pouring of the tie beam, is suitable for the bridge construction of the reverse construction method, and also enables creeping formwork pouring and slip form pouring to be used for pouring operation of pier columns with tie beams and double piers in the normal construction process, thereby greatly improving the pouring efficiency and reducing the investment of equipment and personnel in the pouring construction; moreover, the internal mold device and the pre-embedding method are simple, and the equipment cost and the construction cost are hardly increased.

According to the invention, the rib-shaped cavity is reserved in the pier stud corresponding to the end part of the tie beam by pre-embedding the rib-shaped inner mold, after the tie beam concrete 19 is poured, a stable rib-shaped anchoring structure is formed between the end part of the tie beam and the pier stud, the structure bears the main tension of the tie beam, the concrete bonding force between the end surface of the tie beam and the surface of the pier stud is auxiliary bearing force, the function weakening and even loss of the post-cast tie beam caused by the cracking of the bonding surface of new and old concrete are avoided, and the long-term stability of the post-cast tie beam is ensured.

Claims (10)

1. The utility model provides a pre-buried centre form of two mound bridge pouring construction, a serial communication port, including a main section of thick bamboo (1) and a plurality of side section of thick bamboos (2), it is uncovered that main section of thick bamboo (1) inner seals the outer end, side section of thick bamboo (2) both ends are sealed, it has a plurality of through-holes (3) to open on the terminal surface in a main section of thick bamboo (1), a plurality of side section of thick bamboos (2) circumference equipartitions are outside a main section of thick bamboo (1) and become fixed contained angle with a main section of thick bamboo (1) axis, the inner and the laminating of a main section of thick bamboo (1) lateral wall of a side section of thick bamboo (2), the outer end parallel and level of the outer end of a main section of thick bamboo (1), a plurality of main section of thick bamboos (1) and side section of thick bamboo (2) are constituteed rib column structure.

2. The embedded inner die for double-pier bridge pouring construction according to claim 1, wherein the inner end of the side cylinder (2) is fixed with the main cylinder (1) through a bolt (4).

3. The embedded inner die for double-pier bridge pouring construction according to claim 1, wherein the outer end of each side tube (2) is provided with a threaded hole (5).

4. The embedded inner die for double-pier bridge pouring construction according to claim 1, wherein a radial cross brace (6) is fixed in the main cylinder (1).

5. A tie beam post-pouring construction process of a pre-buried inner mold for double-pier bridge pouring construction is characterized in that the inner mold is any one of the inner molds of claims 1- (4), and the construction process comprises the following construction steps:

the method comprises the following steps: pouring the pier stud, hoisting the pier stud reinforcement cage (7) to a calibration position, building a pier stud template (8) system, and pouring pier stud concrete (9) section by section from bottom to top;

step two: pre-embedding an internal mold, when a pier stud is poured to a section below the elevation of the bottom of a tie beam, fixing a side cylinder (2) on the outer wall of a main cylinder (1) by using a bolt (4), so that the main cylinder (1) and the side cylinder (2) form an umbrella-shaped internal mold, then pre-embedding the internal mold at the connecting position of the end part of the tie beam and the pier stud, inserting a pre-embedded connecting steel bar (10) into each through hole (3) of the main cylinder (1) and binding and fixing the pre-embedded connecting steel bar with a pier stud steel bar cage (7);

step three: additionally planting embedded connecting steel bars (10), and additionally arranging the embedded connecting steel bars (10) positioned on the periphery of the main cylinder (1) in the projection range of the end face of the tie beam;

step four: continuously pouring pier column concrete (9) to the elevation;

step five: the internal mold is pulled out, a tie beam template (12) is built, a tie beam reinforcement cage (13) is hoisted, and the end part of the tie beam reinforcement is connected with the embedded connecting reinforcement (10);

step six: pouring the tie beam concrete (19) to the top standard height of the tie beam;

step seven: and after the concrete is solidified, dismantling the tie beam template (12) to finish post-pouring operation of the tie beam.

6. The tie beam post-pouring construction process of the embedded inner die for the double-pier bridge pouring construction according to claim 5, characterized in that in the second step, before the embedded connecting steel bars (10) are bound, horizontal transverse bars (14) perpendicular to the embedded connecting steel bars (10) are bound on the pier column steel reinforcement cage (7), and the inner ends of the embedded connecting steel bars (10) can be bound on the steel reinforcement cage and can also be bound on the horizontal transverse bars (14).

7. The tie beam post-pouring construction process of the embedded inner mold for double-pier bridge pouring construction according to claim 5, characterized in that in the second step and the third step, the embedded connecting steel bars (10) and the through holes (3) are plugged by foamed rubber, the outer end of the main cylinder (1) is plugged by a bamboo rubber plate or a foam plate, and the threaded holes (5) in the outer ends of the side cylinders (2) and the outer ports of all the threaded sleeves (11) are plugged by plastic films or rubber plugs.

8. The tie beam post-pouring construction process of the embedded inner die for the double-pier bridge pouring construction according to claim 5, characterized in that in the second step, an inner threaded pipe (15) is embedded at a position lower than the elevation of the bottom of the tie beam, the inner threaded pipe (15) is radially arranged along a pier stud, and in the fifth step, when the tie beam formwork (12) is built, the inner threaded pipe (15) is used for installing a bracket (16) and bearing a system of the tie beam formwork (12).

9. The tie beam post-pouring construction process of the embedded inner mold for the double-pier bridge pouring construction according to claim 5, characterized in that in the fifth step, a micro steel reinforcement cage framework (18) is implanted in the cavity formed by each side tube (2), the inner end of the framework is fixedly bound with the embedded connecting steel bars (10) in the cavity of the main tube (1), and the outer end of the framework is fixedly bound with the tie beam steel bars.

10. The tie beam post-pouring construction process of the embedded inner mold for double-pier bridge pouring construction according to claim 5, characterized in that in the fifth step, after the inner mold is pulled out, the inner wall of the inner mold cavity is roughened, then the hole is cleaned, and the pier stud outer wall at the position combined with the end part of the tie beam is roughened.

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