CN110607750A - High-altitude large-scale structure load-bearing steel support and construction method - Google Patents

Abstract

The invention provides a high-altitude large-scale structural load-bearing steel support and a construction method, and relates to the technical field of bridge construction. A high-altitude large-scale structural heavy-duty steel support, which includes bridge pier columns arranged under the two ends of the cover beam, corbels arranged on the bridge pier columns, and the corbels are arranged in pairs at different heights of the bridge pier columns. There is a temporary support platform on the corbel, and a load-bearing structure is set up on the temporary support platform. There is a reserved channel horizontally on the bridge pier, and a prestressed connecting rod is pierced in the reserved channel. The two ends of the prestressed connecting rod are respectively connected to the cattle The legs are connected. A construction method for heavy-duty steel supports of high-altitude large-scale structures, including: S1: processing various components and transporting them to the construction site; S2: pouring bridge piers; S3: setting up embedded channels; S4: inserting prestressed connecting rods; S5: installing Corbel; S6: build temporary support platform; S7: build load-bearing structure. The invention has the beneficial effects of strong structural force bearing capacity and guaranteed durability and aesthetics of the main structure.

Description

High-altitude large-scale structure load-bearing steel support and construction method

technical field

The invention relates to the technical field of bridge construction, in particular to a high-altitude large-scale structural load-bearing steel support and a construction method.

Background technique

In the process of bridge construction, when the span of the bridge is large, the cap girder used is usually heavier than the conventional cap girder, and the height of the pier body is also higher. The use of conventional steel pipe pile supports is obviously uneconomical and has poor durability.

In order to solve the above problems, the Chinese invention with the notification number CN106677070B discloses a high-altitude large-span heavy-duty beam construction support and a construction method. The construction support includes a lower corbel support structure and an upper corbel support located above the lower corbel support structure. structure, the middle support structure whose bottom is supported on the lower corbel support structure, the upper corbel support structure is flush with the top surface of the middle support structure, and the two form a temporary support platform to support the constructed beams, and the temporary support platform is erected There is a load-bearing structure, in which the structure of the lower corbel and the upper corbel is fixed on the tower column by the upper pre-embedded anchor box and the lower pre-embedded anchor box, and the outer end of the horizontal support corbel forming the upper corbel or lower corbel is fixed on the In the upper pre-embedded anchor box, the outer end of the oblique corbel is fixed in the lower pre-embedded anchor box, multiple lines of fine-rolled rebar are evenly arranged in the horizontal support corbel, and the inner and outer sides of the horizontal support corbel are equipped with multiple An anchor for finishing rolled rebar.

The invention can effectively solve the problems of high cost, complicated erection process, long construction period and the like existing in the existing floor-standing steel pipe support system.

However, the above-mentioned existing technical solutions have the following defects: because the installation of the lower corbel and the upper corbel adopts the method of anchoring the upper corbel and the lower corbel to the upper embedded anchor box and the lower embedded anchor box This type of pre-embedded corbel bears less force, and it is difficult to dismantle the upper and lower pre-embedded anchor boxes after the structural parts are poured, resulting in an unsightly surface of the pier, and the upper and lower pre-embedded anchor boxes The pre-embedded anchor box is generally a steel plate, so its anti-corrosion effect and structural durability are poor.

Contents of the invention

One of the objectives of the present invention is to provide a heavy-duty steel bracket for a large-scale high-altitude structure, which is provided with a reserved channel on the pier body, and uses a prestressed connecting rod to pass through the reserved channel to connect the corbel, and set a supporting platform on the corbel to Supporting the load-bearing structure makes the corbel have a large force, and the durability and beauty of the main structure are guaranteed.

One of above-mentioned purpose of the invention of the present invention is achieved through the following technical solutions:

A high-altitude large-scale structural heavy-duty steel bracket, including bridge pier columns arranged under the two ends of the cover beam, and corbels arranged on the bridge pier columns, and the corbels are arranged on the bridge pier columns facing each other At different heights, a temporary support platform is provided on the corbel, and a load-bearing structure for horizontally supporting the cover beam is set up on the temporary support platform. A prestressed connecting rod is pierced in the channel, and both ends of the prestressed connecting rod are respectively connected with the corbels.

By adopting the above-mentioned technical scheme, during the pouring process, the bridge pier column first leaves a horizontal reserved channel inside, and after the bridge pier column is solidified, the connection of the corbel and the construction of the temporary support platform and the load-bearing structure can be carried out. By inserting the prestressed connecting rod into the reserved channel, and applying prestress to the prestressed connecting rod so that the prestressed connecting rod tightens the corbels at both ends, the horizontal tension applied to the corbel by the temporary support platform is determined by the prestressed connecting rod. The vertical force is borne by the friction force generated by the pressure applied to the corbel by the prestressed connecting rod. The bridge pier will not be damaged during the whole process. The force of this design method is clear, the force of the temporary structure is large, and the durability and beauty of the main structure are guaranteed.

The present invention is further configured as follows: the corbel includes a bottom plate, a load-bearing plate perpendicular to the bottom plate, and several support plates perpendicular to the bottom plate and the load-bearing plate at the same time, the support plates are right-angled trapezoids or right-angled triangles and the The two right-angled sides of the support plate are respectively arranged in close contact with the base plate and the load-bearing plate, and the hypotenuse of the support plate is located in a direction away from the intersection angle between the support plate and the base plate; several connection holes are provided on the base plate.

By adopting the above technical scheme, when the corbel is installed, the bottom plate is close to the surface of the bridge pier column, the load-bearing plate is in the horizontal direction, and the side of the load-bearing plate away from the support plate faces upward, and the top of the load-bearing plate is used to build a temporary support platform , when the gravity of the cover beam is transmitted to the temporary support platform through the load-bearing structure, the temporary support platform applies force to the load-bearing plate and the bottom plate, and the support plate supports the load-bearing plate from below the load-bearing plate, ensuring that the load-bearing plate has a large bearing capacity; the connection The positions of the holes correspond to the embedded channels one by one, and are used for the prestressed connecting rods to pass through. The corbel has a reasonable structure, bears a relatively large gravity, and can better support the cover beam.

The present invention is further configured as follows: the prestressed connecting rod is a finish-rolled threaded steel, and the two ends of the finished-rolled threaded steel respectively pass through the connecting holes on the corbels facing each other and connect tension nuts at the piercing ends .

By adopting the above-mentioned technical scheme, the finish-rolled rebar is a straight steel bar with large diameter, high strength and high dimensional accuracy rolled with discontinuous external thread on the whole steel bar, and the steel bar can be screwed on any cross-section with Connectors with internal threads or screw on threaded nuts for anchoring. The tension nuts in the above structure have the same function as the connectors or nuts. When the finished rolled rebar passes through the embedded channel, it will form a corbel The connecting holes on the bottom plate of the finished rolling steel are set at both ends of the finished rolled rebar, and the tension nuts are screwed into the two ends of the finished rolled rebar passing through the connecting holes, so that the tightening nuts are separated from the two ends of the finished rolled rebar respectively. Press the corbel to the position close to the bridge pier, so as to realize the installation of the corbel.

The present invention is further set as: a pre-embedded pipe is arranged in the reserved channel.

By adopting the above technical scheme, the setting of the pre-embedded pipe ensures the integrity of the reserved passage, and also makes the construction of the reserved passage more convenient.

The present invention is further provided that: the pre-embedded pipe is a PVC pipe or a galvanized pipe.

By adopting the above technical scheme, PVC pipes or galvanized pipes have better anti-corrosion and anti-rust effects than ordinary steel pipes, and no steel components are exposed after the structural parts are poured and the corbels are removed, so as to ensure the durability of the main project .

The present invention is further provided that: the load-bearing structure includes a bottom form, a distribution beam and a load-bearing beam arranged sequentially from top to bottom.

By adopting the above technical solution, the stability of the placement position of the cover beam is guaranteed. At the same time, the weight of the cover beam can be relatively evenly distributed to the load-bearing beam without excessive stress concentration, and finally transmitted to the lower part through the load-bearing beam. Temporary support platforms and corbels ensure the stability of the cover beam construction.

The present invention is further set up as follows: the temporary support platform includes a sand bucket or a shaped steel support arranged on the uppermost corbel of the bridge pier column and a shaped steel brace arranged on the rest of the corbels, the sand bucket or Both the shaped steel support and the upper end of the shaped steel diagonal brace are connected to the bottom surface of the load-bearing beam.

By adopting the above technical scheme, the pressure of the load-bearing beam can directly act on the upper corbel through the support of the sand bucket or profiled steel, and can also be transmitted to the lower corbels through the profiled steel diagonal brace, and the cover beam is jointly supported by multiple corbels. Gravity, the force of a single corbel is small, and the support to the load-bearing beam is stable and reliable.

In the present invention, it is further configured that: a section steel cross brace is connected between adjacent section steel diagonal braces.

By adopting the above-mentioned technical scheme, each profiled steel brace can be restrained by the profiled steel cross brace after being stressed, so as to ensure the stability and reliability of the temporary support platform, thereby stably supporting the load-bearing structure and the cover beam.

The second object of the present invention is to provide a construction method of heavy-duty steel brackets for high-altitude large-scale structures, which will not cause damage to bridge pier columns during the installation of corbels, and will not leave behind bridge pier columns after corbels are removed. The lower steel components ensure the durability and aesthetics of the main structure.

Two of the above-mentioned purpose of the invention of the present invention is achieved by the following technical solutions:

A construction method for high-altitude large-scale structural load-bearing steel brackets, comprising:

S1: Process each component according to the drawing and transport it to the construction site;

S2: pouring bridge piers;

S3: the pre-embedded channel is set at the set height of the bridge pier column;

S4: Insert the prestressed connecting rod in the embedded channel;

S5: Connect the corbel at both ends of the prestressed connecting rod;

S6: build temporary support platform on corbel;

S7: Build a load-bearing structure on a temporary support platform.

By adopting the above technical scheme, the installation of the corbel will not cause damage to the bridge pier columns. When the bridge is built and the corbels are removed, the prestressed connecting rods will be taken out, and no steel structural parts will be exposed inside the bridge pier columns, thus ensuring Durability and aesthetics of the body part.

In summary, the beneficial technical effects of the present invention are:

1. By setting up a reserved channel in the pier body, and using prestressed connecting rods to pass through the reserved channel to connect the corbel, a supporting platform is set on the corbel to support the load-bearing structure, so that the corbel bears a large force and the durability of the main structure And the beauty is guaranteed;

2. Pre-embedded PVC pipes are used as reserved holes for steel corbels and fine-rolled rebars. After the structural parts are poured and the steel corbels are removed, no steel components are exposed to ensure the durability of the main project;

3. Make full use of the characteristics of high tensile strength of the finished rolled rebar, and use it as a prestressed connecting rod to bear the pouring load of large structural parts;

4. Use large-scale steel to set up profiled steel supports or profiled steel diagonal braces on the corbels as the main force-bearing system of cast-in-place structural parts, which is safe and reliable.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of a high-altitude large-scale structural load-bearing steel bracket disclosed in Embodiment 1 of the present invention.

Fig. 2 is a structural schematic diagram of a corbel.

Fig. 3 is a schematic cross-sectional structure diagram of a bridge pier column, which is mainly used to represent the structure of the prestressed channel.

Fig. 4 is a flow chart of a construction method for a high-altitude large-scale structural load-bearing steel bracket disclosed in Embodiment 2 of the present invention.

In the figure, 1. Cover beam; 2. Load-bearing structure; 21. Bottom form; 22. Distribution beam; 23. Load-bearing beam; 3. Temporary support platform; ; 4, corbel; 41, bottom plate; 42, bearing plate; 43, support plate; 44, connection hole; 5, bridge pier column; 6, prestressed connecting rod; ; 8. Reserved channel; 9. Embedded pipe.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Embodiment one

Referring to Fig. 1, a high-altitude large-scale structural load-bearing steel support provided by the present invention includes bridge pier columns 5 arranged below the two ends of the cover beam 1, corbels 4 arranged on the bridge pier columns 5, and corbels 4 in pairs A total of two groups are arranged at different heights of the bridge pier column 5, a temporary support platform 3 is set up on the corbel 4, and a load-bearing structure 2 for horizontally supporting the cover beam 1 is set up on the temporary support platform 3.

With reference to Fig. 2, corbel 4 comprises base plate 41, load-bearing plate 42 perpendicular to base plate 41 and several support plates 43 perpendicular to base plate 41 and load-bearing plate 42 simultaneously, support plate 43 is right-angled trapezoid or right-angled triangle and the two sides of support plate 43 The right-angled sides are arranged in close contact with the bottom plate 41 and the bearing plate 42 respectively, and the hypotenuse of the support plate 43 is located in a direction away from the intersection angle between the support plate 43 and the bottom plate 41 . The support plate 43 in this embodiment of the present invention is a right-angled trapezoid, and there are two support plates 43, and the support plate 43, the bottom plate 41 and the load-bearing plate 42 are all welded and connected; the bottom plate 41 is provided with several connection holes 44. When the corbel 4 is installed, the bottom plate 41 is placed close to the surface of the bridge pier column 5, the load-bearing plate 42 is in the horizontal direction, and the side of the load-bearing plate 42 away from the support plate 43 faces upward, and the top of the load-bearing plate 42 is used to build a temporary support Platform 3, when the gravity of the cover beam 1 is transmitted to the temporary support platform 3 through the load-bearing structure 2, the temporary support platform 3 applies force to the load-bearing plate 42 and the bottom plate 41, and the support plate 43 supports the load-bearing plate 42 from below the load-bearing plate 42, ensuring The load-bearing plate 42 has a large bearing capacity; the position of the connecting hole 44 corresponds to the embedded channel one by one, and is used for the prestressed connecting rod 6 to pass through. The corbel 4 has a reasonable structure, bears relatively large gravity, and can better support the cover beam 1 .

Referring to Figure 3, the connection structure of the corbel 4 is as follows: a reserved channel 8 is horizontally arranged on the bridge pier column 5, and a pre-embedded pipe 9 is embedded in the reserved channel 8, and the pre-embedded pipe 9 is a PVC pipe or a galvanized pipe, PVC Compared with ordinary steel pipes, steel pipes or galvanized pipes have better anti-corrosion and anti-rust effects. After the structural parts are poured and the corbels 4 are removed, no steel components will be exposed to ensure the durability of the main project; The prestressed connecting rod 6 is pierced. The prestressed connecting rod 6 in this embodiment of the present invention is a finish-rolled rebar 61. Connect tension nut 7 at its passing end.

Referring to FIG. 1 , the load-bearing structure 2 includes a bottom form 21 , a distribution beam 22 and a load-bearing beam 23 arranged in sequence from top to bottom. The temporary support platform 3 includes a sand bucket 32 or a profiled steel support vertically arranged on the top corbel 4 of the bridge pier column 5 and a profiled steel diagonal brace 31 arranged on the corbel 4 below. In this embodiment of the present invention, the The support on the uppermost corbel 4 is a welded sand bucket 32 , and the upper ends of the sand bucket 32 and the shaped steel brace 31 are all connected with the bottom surface of the load-bearing beam 23 . The pressure of the load-bearing beam 23 can directly act on the upper corbel 4 through the sand bucket 32, or can be transmitted to the lower corbels 4 through the steel braces 31, and the gravity of the cover beam 1 is supported by multiple corbels 4, The stress of a single corbel 4 is small, and the support to the load-bearing beam 23 is stable and reliable.

In addition, in order to increase the stability of the temporary support platform 3, adjacent section steel diagonal braces 31 are connected with section steel cross braces 33, and each section steel diagonal brace 31 can be restrained by section steel cross braces 33 after being stressed, ensuring The stability and reliability of the temporary support platform 3 are used to stably support the load-bearing structure 2 and the cover beam 1 .

When using the above-mentioned high-altitude large-scale structural heavy-duty steel bracket, the gravity of the cover beam 1 is transmitted to the load-bearing structure 2, and the load-bearing structure 2 applies the force to the temporary support platform 3 through the steel support and the steel diagonal brace 31, and the temporary support platform 3 is applied to the corbel The horizontal tension of 4 is borne by the prestressed connecting rod 6, and the vertical force is borne by the friction force generated by the pressure applied by the prestressed connecting rod 6 to the corbel 4; when the construction is completed, the force on the prestressed connecting rod 6 is released, and the The corbel 4 is removed, and the prestressed connecting rod 6 is pulled out from the reserved channel 8 without causing damage to the bridge pier column 5 during the whole process. The force of this design method is clear, the force of the temporary structure is large, and the durability and beauty of the main structure are guaranteed.

Embodiment two

Referring to Fig. 4, this embodiment of the present invention discloses a construction method of a high-altitude large-scale structural load-bearing steel bracket, including:

S1: Process each part according to the drawings, including welding corbels 4, prepare PVC pipes or galvanized pipes of corresponding length, finish-rolled rebar 61 and compression nuts, and transport them to the construction site;

S2: Pouring bridge pier column 5: pouring bridge pier column 5 on site according to construction specifications and requirements;

S3: the pre-embedded channel is set at the set height of the bridge pier column 5: according to the design drawing, on the height where the corbel 4 is installed, the position corresponding to the connection hole 44 on the corbel 4 is pre-embedded PVC pipe or galvanized pipe;

S4: Insert the prestressed connecting rod 6 in the pre-buried channel: insert the pre-prepared finish-rolled rebar 61 into the pre-buried PVC pipe or galvanized pipe;

S5: Connect the corbel 4 at both ends of the prestressed connecting rod 6: after the finish-rolled rebar 61 passes through the embedded passage, set the connecting hole 44 on the bottom plate 41 of the corbel 4 in the finish-rolled rebar 61 two ends, and the two ends of the finish-rolled rebar 61 passing through the connecting hole 44 are screwed into the tension nut 7, so that the tension nut 7 presses the corbel 4 from the two ends of the finish-roll rebar 61 to be close to each other. The position of the bridge pier column 5, so as to realize the installation of the corbel 4;

S6: Build a temporary support platform 3 on the corbel 4: connect the profile steel support on the corbel 4 above, connect the profile steel diagonal brace 31 on the corbel 4 below, and the profile steel on the two adjacent bridge pier columns 5 The cross braces 33 are connected between the diagonal braces 31, and the connections between the steel braces, the diagonal braces 31 and the cross braces 33 are bolt connections;

S7: Build the load-bearing structure 2 on the temporary support platform 3.

In the above method, the installation of the corbel 4 will not cause damage to the bridge pier column 5. When the bridge is built and the corbel 4 is removed, the prestressed connecting rod 6 will be taken out, and no steel structural parts will be exposed inside the bridge pier column 5. Thereby ensuring the durability and aesthetics of the main body part.

The embodiments of this specific implementation mode are all preferred embodiments of the present invention, and do not limit the scope of protection of the present invention accordingly. Therefore: all equivalent changes made according to the structure, shape and principle of the present invention should be covered by the present invention. within the protection scope of the present invention.

Claims (9)

1. The utility model provides a high altitude large structure bearing shaped steel support, is including locating bridge pier stud (5) of bent cap (1) both ends below, locating bracket (4) on bridge pier stud (5), two liang of just right locating of bracket (4) on the not co-altitude of bridge pier stud (5), be equipped with interim supporting platform (3) on bracket (4), set up bearing structure (2) that carry out the horizontal support to bent cap (1) on interim supporting platform (3), its characterized in that: bridge pier stud (5) are improved level and are equipped with reservation passageway (8), wear to be equipped with prestressing force connecting rod (6) in reservation passageway (8), prestressing force connecting rod (6) both ends respectively with bracket (4) are connected.

2. The high-altitude large-scale structure load-bearing section steel support as claimed in claim 1, wherein: the bracket (4) comprises a bottom plate (41), a bearing plate (42) perpendicular to the bottom plate (41) and a plurality of supporting plates (43) perpendicular to the bottom plate (41) and the bearing plate (42) at the same time, the supporting plates (43) are in a right trapezoid shape or a right triangle shape, two right-angle sides of the supporting plates (43) are respectively clung to the bottom plate (41) and the bearing plate (42), and the hypotenuse of the supporting plates (43) is positioned in the direction far away from the intersection angle of the supporting plates (43) and the bottom plate (41); the bottom plate (41) is provided with a plurality of connecting holes (44).

3. The high-altitude large-scale structure load-bearing section steel support as claimed in claim 2, wherein: the prestressed connecting rod (6) is a finish rolling deformed steel bar (61), two ends of the finish rolling deformed steel bar (61) respectively penetrate through the connecting holes (44) on the brackets (4) which are opposite to each other, and the penetrating ends of the finish rolling deformed steel bar are connected with the tensioning nuts (7).

4. The high-altitude large-scale structure load-bearing section steel support as claimed in claim 1, wherein: a pre-buried pipe (9) is arranged in the reserved passage (8).

5. The high-altitude large-scale structure load-bearing section steel support as claimed in claim 4, wherein: the embedded pipe (9) is a PVC pipe or a galvanized pipe.

6. The high-altitude large-scale structure load-bearing section steel support as claimed in claim 1, wherein: the bearing structure (2) comprises a bottom die (21), a distribution beam (22) and a bearing beam (23) which are sequentially arranged from top to bottom.

7. The high-altitude large-scale structure load-bearing section steel support as claimed in claim 6, wherein: interim supporting platform (3) are including locating bridge pier stud (5) the top sand bucket (32) or shaped steel on bracket (4) support and locate all the other shaped steel bracing (31) on bracket (4), sand bucket (32) or shaped steel support and the upper end of shaped steel bracing (31) all with the bottom surface of spandrel girder (23) is connected.

8. The high-altitude large-scale structure load-bearing section steel support as claimed in claim 7, wherein: and a section steel cross brace (33) is connected between the adjacent section steel inclined braces (31).

9. The construction method for the high-altitude large-scale structural load-bearing section steel support as claimed in any one of claims 1 to 8, is characterized in that: the method comprises the following steps:

s1, processing each part according to the drawing and transporting the parts to a construction site;

s2, pouring a bridge pier stud (5);

s3, burying a pre-buried pipe (9) at the set height of the bridge pier stud (5);

s4, inserting a prestressed connecting rod (6) into the embedded channel;

s5, connecting brackets (4) at two ends of the prestressed connecting rod (6);

s6, building a temporary supporting platform (3) on the bracket (4);

s7, building a bearing structure (2) on the temporary supporting platform (3).