Construction system and method of steel tube concrete assembled truss composite beam

Abstract

The present invention provides a steel tube concrete assembled truss composite beam construction system and construction method, by setting a scaffolding support system, a standardized temporary support, a bridge deck steel bar binding frame and a bridge deck concrete construction platform; the cast-in-place cap of the scaffolding support system is embedded in a steep mountain; a side upright of the standardized temporary support is set through the bridge deck; the bridge deck steel bar binding frame is set on the circular support plates of the standardized temporary support on both sides; the transverse steel springboard of the bridge deck concrete construction platform is set on the connecting rods of the standardized temporary support on both sides. The present invention adopts a steel tube pile-supported scaffolding support system or a step-type scaffolding support system for different terrains, and makes full use of the standardized temporary support to set the bridge deck steel bar binding frame and the bridge deck concrete construction platform, and also adds a tensioning fixing device and a fixed hanger, which has the characteristics of advanced technology, good structural stability, high construction efficiency and safety.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a construction system and a construction method for a steel tube concrete assembled truss composite beam. Background Art

[0002] Steel tube concrete truss breaks through the traditional application scope of steel tube concrete structure, can give full play to the mechanical performance of steel tube concrete, and is an important direction for the development of steel tube concrete structure. To some extent, the characteristics of steel tube-concrete truss composite beam structure in design and construction conform to the trend of future bridge design and construction development, that is, on the premise of maintaining the original traffic, speed up the construction progress, improve the quality of the project, and make the project construction develop in the direction of prefabrication and rapid construction.

[0003] However, during the actual design and construction, it was found that the traditional truss beam with concrete filled in the upper chord still has some shortcomings. First, since only concrete is filled in the upper chord, the truss beam has poor integrity, and the structural strength and stiffness of the lower chord and the belly tube are still weak. In order to ensure the reliability of the belly tube, it is necessary to increase or thicken the belly tube, or to set more belly tubes, which further increases the construction cost. On the other hand, the on-site construction efficiency is low, mainly limited by the foundation form. The foundation treatment consumes a long construction time. At the same time, the insufficient design of the bridge deck reinforcement binding and concrete pouring construction platform further reduces the overall construction efficiency.

[0004] In view of such problems, there is an urgent need to invent a construction method for steel tube concrete assembled truss composite beams with good construction quality, high construction efficiency, and outstanding economic and technical benefits. Summary of the invention

[0005] The purpose of the present invention is to provide a steel tube concrete assembled truss composite beam construction system and a construction method, aiming to solve the technical problems of poor construction quality and low construction efficiency of steel tube concrete trusses at this stage.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The steel tube concrete assembled truss composite beam construction system includes a scaffolding support system, a standardized temporary support, a bridge deck reinforcement binding frame and a bridge deck concrete construction platform;

[0008] The scaffolding support system includes a cast-in-place cap, a steel pipe column, a lower beam, a Bailey truss, a distribution beam and a full-floor scaffolding arranged in sequence from bottom to top; the cast-in-place cap is embedded in a steep mountain;

[0009] The standardized temporary support comprises a vertical pole and a connecting rod; wherein one side of the vertical pole is arranged to penetrate the bridge deck, and circular support plates are arranged vertically and evenly spaced within the bridge deck elevation range of the bridge body;

[0010] The bridge deck reinforcement binding frame includes a transverse frame and a longitudinal frame; the transverse frame is arranged across the bridge deck on the circular support plates of the fixed temporary support on both sides, and the longitudinal frame is arranged on the circular support plate of the fixed temporary support on the same side in parallel with the lower chord and is arranged in sections between the transverse frames;

[0011] The bridge deck concrete construction platform includes a transverse steel springboard and a longitudinal steel springboard; the transverse steel springboard is arranged on the connecting rods of the standardized temporary brackets on both sides across the bridge deck, and the longitudinal steel springboard is arranged on the transverse steel springboard and is laterally fixed by a limit plate.

[0012] As a further improvement of the present invention, a template is installed on the top of the scaffolding support system, and standardized temporary brackets are arranged on both sides; a bridge deck steel bar binding cradle arranged on the standardized temporary bracket is used to carry out steel bar operations; a bridge deck concrete construction platform arranged on the standardized temporary bracket is used to carry out concrete operations on the steel truss; the steel strands on the lower chord are tensioned by a tensioning and fixing device; the steel truss is poured with concrete by a grouting pipe on a fixed hanger.

[0013] As a further improvement of the present invention, the scaffolding support system includes a steel pipe pile-supported scaffolding support system and a step-type scaffolding support system; the step-type scaffolding support system includes a step-type support foundation and a full-floor scaffolding; the step-type support foundation is formed by excavating the original soil into a step shape and casting it through a standardized step-by-step tie-form formwork.

[0014] As a further improvement of the present invention, the standardized step-by-step tie template includes side panels, a reversible template and a limit block; the side panels on both sides are vertically embedded in the original soil and are provided with a slide groove; the reversible template is erected in the slide groove of the side panel through the central end rods at both ends and is fixed by a limit block.

[0015] As a further improvement of the present invention, hoop-type connectors are provided between the steel pipe columns.

[0016] As a further improvement of the present invention, the top surface of the tensioning and fixing device is arc-shaped, and a lower edge plate is provided on one side, and the lower edge plate is anchored and connected to the side surface of the lower chord.

[0017] As a further improvement of the present invention, the fixed hanger includes a diagonal brace, a transverse plate and a limiting ring, wherein one diagonal brace is supported on the steel truss by an end arc-shaped support plate, and the other diagonal brace is fixed to the steel truss by an end clamp, and the other ends of the two diagonal braces are hingedly connected and provided with a transverse plate, on which a limiting ring for positioning the grouting pipe is vertically arranged.

[0018] As a further improvement of the present invention, the bridge body includes a lower chord, a bridge deck, an upper chord, end diagonal bars, end cross beams, a middle cross beam and piers; the upper chord is positioned on the lower chord through a web; the lower chord is positioned on the cap beam of the pier through a permanent support; the bridge deck is arranged between the two lower chords; the end diagonal bars are arranged at both ends of the upper chord and are positioned and connected with the two ends of the lower chord; the end cross beams are arranged at both ends of the bridge deck; and the middle cross beam is arranged in the middle position of the bridge deck.

[0019] As a further improvement of the present invention, an auxiliary upright pole is further provided; the auxiliary upright pole abuts against the upper chord rod to limit position.

[0020] The construction method of the steel tube concrete assembled truss composite beam comprises the following steps:

[0021] S1. Foundation treatment: For steeper slopes, first excavate the original soil into steps, install standardized step-by-step tie templates on the original soil, where the flip templates are set at intervals of one step, and cast the step-type support foundation in two times; For steeper slopes, first construct a cast-in-place cap on the slope surface, set up steel pipe columns on the cast-in-place cap, lay the lower beam on the foundation of the steel pipe columns to hoist the Bailey truss, and install the distribution beam as the foundation of the full-floor scaffolding; For low dam-type slopes, directly fill and level them;

[0022] S2. Full-floor scaffolding erection: According to the plan layout of the scaffolding and the height difference between the ground and the bottom of the beam, the full-floor scaffolding is configured and erected. A horizontal scissors brace is set every four rows of the scaffolding, and a scissors brace is set longitudinally on the edge of the scaffolding;

[0023] S3. Installation of standardized temporary supports: Under the condition of too steep slope, the standardized temporary supports are directly erected on the distribution beam. Under other conditions, I-beams are directly set on the ground as the foundation of the standardized temporary supports. When erecting, the poles are first erected, of which the poles on the bridge side need to pass through the bridge deck and stand on the distribution beam, and circular support plates are pre-welded vertically at equal intervals within the bridge deck elevation range of the bridge body, and then tie rods are welded between the poles for reinforcement;

[0024] S4. Bottom formwork installation: The bottom formwork installation is mainly carried out manually with mechanical coordination, and the pre-camber is set;

[0025] S5. Installation of bridge deck reinforcement tyre frames: first install the transverse tyre frames, which are installed across the bridge deck on the circular support plates of the standardized temporary supports on both sides, and then cut the longitudinal tyre frames according to the spacing after the transverse tyre frames are installed. The longitudinal tyre frames are installed parallel to the lower chord on the circular support plates of the standardized temporary supports on the same side, and are arranged in sections between the transverse tyre frames;

[0026] S6. Rebar binding construction: The order of reinforcement construction is end beam, lower chord, middle beam, bridge deck. The reinforcement of the bridge deck is constructed layer by layer using a pre-set cradle. The longitudinal and transverse bridge deck reinforcement binding cradles are installed synchronously layer by layer on the circular pallet, and can also be directly lifted layer by layer.

[0027] S7, Steel truss hoisting: Each steel truss is divided into 11 sections in the factory according to the requirements of the design drawings, and then transported to the construction site and welded into three sections. The joints of each hoisting section and the corresponding steel parts are welded and installed. After the welds are qualified by ultrasonic testing, the first supplementary coating is carried out; then the sections are hoisted and placed in place on the top of the finalized temporary support; and the steel truss joints are accurately docked according to the requirements of the drawings;

[0028] S8, Installation of inner mold, end mold and side mold: uniformly use high-strength bamboo plywood, gradually install the inner mold, end mold and side mold, and reasonably set strengthening cross braces;

[0029] S9. Prestressed pipe installation: Prestressed pipes are made of plastic corrugated pipes, and the corrugated pipes are extended by a larger size corrugated pipe sleeve, and are accurately positioned with a "well" shaped positioning frame;

[0030] S10. Construction platform of bridge deck concrete: first install the transverse steel springboard across the bridge deck on the transverse tie rods of the finalized temporary brackets on both sides, and then install the longitudinal steel springboard between the limit plates on the transverse steel springboard to complete the construction of the platform;

[0031] S11, concrete pouring: using the bridge deck concrete construction platform, the concrete pouring is completed in one pouring at full height, and the pouring sequence is end beam, lower chord, middle beam, and bridge deck, which are poured symmetrically in layers;

[0032] S12, tensioning, grouting, and anchor sealing: Install tensioning fixtures in advance before tensioning to prevent accidental pressure relief; implement double control of the tensioning of the strands during tensioning; grouting should be performed as soon as possible after the prestressing is completed, clean the surrounding area after grouting, and roughen the concrete at the beam end and anchor it using anchors;

[0033] S13, Steel truss concrete pouring: First pour concrete into the diagonal rod pipe through the grouting pipe, then install a fixed hanger on the diagonal rod of the steel truss, and pour concrete into the upper chord rod pipe through the grouting pipe on the fixed hanger;

[0034] S14. Removal of the support system: The support can be removed only after the concrete strength in the steel truss reaches 90% of the concrete grade. The support should be removed from the beam end to the middle of the span, and the removal should be done symmetrically.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The present invention adopts a steel pipe pile-supported scaffolding support system or a step-type scaffolding support system according to different terrains, and has a wide range of applications. At the same time, a standardized step-by-step tie-down formwork is used to cast and harden the stepped original soil with concrete. Compared with the traditional step formwork method, the present invention is more efficient and only requires one mold turning and two pourings to complete the work, which greatly improves the on-site construction efficiency.

[0037] 2. The present invention makes full use of the standardized temporary brackets required for the installation of steel trusses, and reasonably arranges the bridge deck steel bar binding cradle and the bridge deck concrete construction platform, which greatly improves the steel bar operation efficiency and the concrete pouring construction quality, and has obvious technical benefits.

[0038] 3. The present invention arranges a tensioning and fixing device in advance before tensioning the lower chord steel strand, which effectively prevents the jack device from deviating and sliding due to accidental pressure relief, thereby improving the safety of on-site construction.

[0039] 4. The present invention temporarily adds a fixed hanger on the steel truss, and pours concrete into the upper chord tube of the steel truss through the fixed hanger, which has good stability and is simpler to install than the bracket support.

[0040] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. It is obvious that the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 It is a schematic diagram of the steel pipe pile-supported scaffolding support system of the present invention;

[0043] Figure 2 It is a schematic diagram of a step-type scaffolding support system in the present invention;

[0044] Figure 3 This is a schematic diagram of the installation of the standardized step-by-step tie template in the present invention;

[0045] Figure 4 It is a side view of the standardized step-by-step tie template in the present invention;

[0046] Figure 5 This is a schematic diagram of the installation of a standardized temporary support in the present invention;

[0047] Figure 6 It is a cross-sectional view of the installation of a standardized temporary support in the present invention;

[0048] Figure 7 It is a schematic diagram of the tensioning and fixing device in the present invention;

[0049] Figure 8 yes Figure 7 Section along AA;

[0050] Fig. 9 It is a schematic diagram of the installation of the fixed hanger in the present invention;

[0051] Fig.10 It is a schematic diagram of the bridge structure in the present invention;

[0052] Description of the numbers in the figure:

[0053] 1. Scaffolding support system; 101. Cast-in-place cap; 102. Steel pipe column; 1021. Hoop type connector; 103. Lower crossbeam; 104. Bailey truss; 105. Distribution beam; 106. Full-floor scaffolding; 107. Step-type support foundation; 108. Standardized step-by-step tie formwork; 1081. Side plate; 10811. Slide; 1082. Reversible formwork; 1083. Limit block; 2. Standardized temporary support; 201. Vertical pole; 202. Tie rod; 203. Round support plate; 3. Bridge deck reinforcement tyre frame; 301. Horizontal tyre frame; 302. Longitudinal tyre frame; 4. Bridge deck concrete construction platform; 4 01. Horizontal steel springboard; 4011. Limiting plate horizontal; 402. Longitudinal steel springboard; 403. Auxiliary vertical pole; 5. Bottom formwork; 6. Bridge body; 601. Lower chord; 602. Bridge deck; 603. Upper chord; 604. End diagonal rod; 605. End cross beam; 606. Middle cross beam; 607. Bridge pier; 6071. Cap beam; 608. Permanent support; 7. Original soil; 8. Tensioning fixture; 9. Jack; 10. Steel strand; 11. Anchor; 12. Fixed hanger; 1201. Diagonal brace; 1202. Cross plate; 1203. Limiting ring; 1204. End arc support plate; 1205. End clamp; 13. Grouting pipe. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Combined with Figures 1 to 10 The present invention provides a steel tube concrete assembled truss composite beam construction system and construction method, aiming to solve the technical problems of poor construction quality and low construction efficiency of steel tube concrete trusses at this stage.

[0056] Specifically, the steel tube concrete assembled truss composite beam construction system includes a scaffolding support system 1, a standardized temporary support 2, a bridge deck steel bar binding frame 3 and a bridge deck concrete construction platform 4;

[0057] The scaffolding support system 1 includes a cast-in-place cap 101, a steel pipe column 102, a lower crossbeam 103, a Bailey truss 104, a distribution beam 105 and a full-floor scaffolding 106 arranged in sequence from bottom to top; the cast-in-place cap 101 is embedded in a steep mountain;

[0058] The standardized temporary support 2 includes a vertical pole 201 and a connecting rod 202; wherein, one side of the vertical pole 201 is set through the bridge deck, and a circular support plate 203 is vertically positioned and evenly spaced within the elevation range of the bridge deck 602 of the bridge body 6;

[0059] The bridge deck reinforcement tyre frame 3 includes a transverse tyre frame 301 and a longitudinal tyre frame 302; the transverse tyre frame 301 is arranged on the circular support plate 203 of the shaped temporary support 2 on both sides across the bridge deck 602, and the longitudinal tyre frame 302 is arranged on the circular support plate 203 of the shaped temporary support 2 on the same side parallel to the lower chord, and is arranged in sections between the transverse tyre frames 301;

[0060] The bridge deck concrete construction platform 4 includes a transverse steel springboard 401 and a longitudinal steel springboard 402; the transverse steel springboard 401 is arranged on the connecting rods 202 of the fixed temporary brackets 2 on both sides across the bridge deck 602, and the longitudinal steel springboard 402 is arranged on the transverse steel springboard 401 and is fixed horizontally by a limit plate 4011.

[0061] The present invention adopts a steel pipe pile-supported scaffolding support system or a step-type scaffolding support system according to different terrains, and makes full use of standardized temporary supports to set up a bridge deck steel bar binding frame and a bridge deck concrete construction platform. At the same time, compared with the traditional construction method, a tensioning fixing device and a fixed hanger are added, which has the characteristics of advanced technology, good structural stability, high construction efficiency and safety.

[0062] A template is installed on the top of the scaffolding support system 1, and standardized temporary supports 2 are arranged on both sides; a bridge deck steel bar binding cradle 3 is arranged on the standardized temporary supports 2 to carry out steel bar operations; a bridge deck concrete construction platform 4 is arranged on the standardized temporary supports 2 to carry out concrete operations on the steel truss; the steel strand 10 on the lower chord is tensioned by a tensioning fixture 8; the steel truss is poured with concrete by a grouting pipe 13 on a fixed hanger 12.

[0063] Furthermore, the scaffolding support system 1 includes a steel pipe pile-supported scaffolding support system 1 and a step-type scaffolding support system 1; the steel pipe pile-supported scaffolding support system 1 is used in steep mountainous areas; and the step-type scaffolding support system 1 is used in gently sloping terrain.

[0064] Furthermore, the step-type scaffolding support system 1 includes a step-type support foundation 107 and a full-floor scaffolding 106; the step-type support foundation 107 is excavated from the original soil 7 into a step shape, and is formed by casting a standardized step-by-step tie template 108.

[0065] Furthermore, the standardized step-by-step tie template 108 includes side panels 1081, a reversible template 1082 and a limit block 1083; the side panels 1081 on both sides are vertically embedded in the original soil 7 and are provided with a slide groove 10811; the reversible template 1082 is mounted in the slide groove 10811 of the side panel 1081 through the central end rods at both ends, and is fixed by the limit block 1083.

[0066] Furthermore, clamp-type connectors 1021 are provided between the steel pipe columns 102 .

[0067] Furthermore, the top surface of the tensioning and fixing device 8 is arc-shaped, and a lower edge plate is provided on one side, and the lower edge plate is anchored and connected to the side surface of the lower chord rod 603.

[0068] Furthermore, the fixed hanger 12 includes an oblique brace 1201, a transverse plate 1202 and a limiting ring 1203, wherein one oblique brace 1201 is supported on the steel truss by an end arc-shaped support plate 1204, and the other oblique brace 1201 is fixed to the steel truss by an end clamp 1205, and the other ends of the two oblique braces 1201 are hingedly connected and provided with a transverse plate 1202, on which a limiting ring 1203 for positioning the grouting pipe 13 is vertically arranged.

[0069] Furthermore, the bridge body 6 includes a lower chord 601, a bridge deck 602, an upper chord 603, an end diagonal rod 604, an end cross beam 605, a middle cross beam 606 and a pier 607; the upper chord 603 is positioned on the lower chord 601 through a web; the lower chord 601 is positioned on the cap beam 6071 of the pier 607 through a permanent support 608; the bridge deck 602 is arranged between the two lower chords 601; the end diagonal rod 604 is arranged at both ends of the upper chord 603, and is positioned and connected with both ends of the lower chord 601; the end cross beam 605 is arranged at both ends of the bridge deck 602; the middle cross beam 606 is arranged in the middle position of the bridge deck 602.

[0070] Furthermore, an auxiliary vertical rod 403 is provided; the auxiliary vertical rod 403 abuts against the upper chord rod 603 to limit position.

[0071] The construction method of the steel tube concrete assembled truss composite beam comprises the following steps:

[0072] S1. Foundation treatment: For steeper slopes, the original soil 7 is first excavated into steps, and a standardized step-by-step tie template 108 is installed on the original soil 7, wherein the reversible template 1082 is arranged at intervals of one step, and the step-type support foundation 107 is cast twice; For overly steep slopes, a cast-in-place cap 101 is first constructed on the slope surface, and a steel pipe column 102 is set on the cast-in-place cap 101. On the foundation of the steel pipe column, a lower crossbeam 103 is laid to hoist the Bailey truss 104, and a distribution beam 105 is installed as the foundation of the full-floor scaffolding 106; For low dam-type slopes, direct filling and leveling treatment is performed;

[0073] S2. Full-floor scaffolding erection: According to the plan layout of the scaffolding and the height difference between the ground and the bottom of the beam, the full-floor scaffolding 106 is configured and erected. A horizontal scissors brace is set every four rows of the scaffolding, and a scissors brace is set longitudinally on the edge of the scaffolding;

[0074] S3. Installation of standardized temporary support: Under the condition of too steep slope, the standardized temporary support 2 is directly erected on the distribution beam 105. Under other conditions, an I-beam is directly set on the ground as the foundation of the standardized temporary support 2. When erecting, first erect the poles 201, of which the bridge-side poles 201 need to pass through the bridge deck 602 and stand on the distribution beam 105, and pre-weld the circular support plates 203 at equal intervals vertically within the elevation range of the bridge deck 602 of the bridge body 6, and then weld the connecting rods 202 between the poles 201 for reinforcement;

[0075] S4, bottom formwork installation: The bottom formwork 5 is installed mainly by manual labor and mechanical coordination, and the pre-camber is set;

[0076] S5. Installation of the bridge deck reinforcement tyre frame: first install the transverse tyre frame 301, which is installed on the circular support plate 203 of the finalized temporary support 2 on both sides across the bridge deck 602, and then cut the longitudinal tyre frame 302 according to the spacing after the transverse tyre frame 301 is installed. The longitudinal tyre frame 302 is installed on the circular support plate 203 of the finalized temporary support 2 on the same side parallel to the lower chord 601, and is arranged in sections between the transverse tyre frames 301;

[0077] S6, steel bar binding construction: The order of steel bar construction is end cross beam 605, lower chord 601, middle cross beam 606, bridge deck 602, wherein the steel bars of bridge deck 602 are constructed layer by layer using a pre-set tire frame, and the longitudinal and transverse bridge deck steel bar binding tire frames 3 are synchronously installed layer by layer on the circular support plate 203, or they can be directly lifted layer by layer;

[0078] S7, Steel truss hoisting: Each steel truss is divided into 11 sections in the factory according to the requirements of the design drawings, and then transported to the construction site and welded into three sections. The joints of each hoisting section and the corresponding steel parts are welded and installed. After the welds are qualified by ultrasonic testing, the first supplementary coating is carried out; then the sections are hoisted and placed in place on the top of the finalized temporary support 2; and the steel truss joints are accurately docked according to the requirements of the drawings;

[0079] S8, Installation of inner mold, end mold and side mold: uniformly use high-strength bamboo plywood, gradually install the inner mold, end mold and side mold, and reasonably set strengthening cross braces;

[0080] S9. Prestressed pipe installation: Prestressed pipes are made of plastic corrugated pipes, and the corrugated pipes are extended by a larger size corrugated pipe sleeve, and are accurately positioned with a "well" shaped positioning frame;

[0081] S10, bridge deck concrete construction platform erection: first, install the transverse steel springboard 401 across the bridge deck 602 on the transverse connecting rods 202 of the finalized temporary brackets 2 on both sides, and then install the longitudinal steel springboard 402 between the limit plates on the transverse steel springboard 401 to complete the platform erection;

[0082] S11, concrete pouring operation: using the bridge deck concrete construction platform 4, the concrete pouring is completed by pouring at full height at one time, and the pouring sequence is the end beam 605, the lower chord 601, the middle beam 606, and the bridge deck 602, which are poured symmetrically in layers;

[0083] S12, tensioning, grouting, and anchor sealing: install the tensioning fixture 8 in advance before tensioning to prevent accidental pressure relief; implement double control on the tensioning of the stranded wire during the tensioning process; after the prestressing is completed, grouting is performed as soon as possible, and the surrounding area is cleaned after grouting, and the concrete at the beam end is roughened and anchored through the anchor 11;

[0084] S13, concrete pouring of steel truss: the concrete in the diagonal rod is first poured into the grouting pipe 13, and then the fixed hanger 12 is installed on the diagonal rod of the steel truss, and the concrete in the upper chord rod 603 is poured into the grouting pipe 13 on the fixed hanger 12;

[0085] S14. Removal of the support system: The support can be removed only after the concrete strength in the steel truss reaches % of the concrete grade. The support should be removed from the beam end to the middle of the span, and the removal should be done symmetrically.

[0086] It should be noted that the distribution beam 105 is an I-beam structure.

[0087] During the specific construction, take the construction of a steel tube concrete assembled truss composite beam as an example:

[0088] Before construction, the original soil 7 is excavated into steps with a height of 60 cm and a width of 120 cm. Then, grooves are cut on the original soil 7 to install standardized step-by-step tie templates 108, in which reversible templates 1082 are arranged at intervals of one step, and the left and right sides are carried out simultaneously. The reversible templates 1082 are fixed with limit blocks 1083 and the first concrete is poured. After hardening, the limit blocks 1083 are released, and the reversible template slides upward one step. After the limit blocks 1083 are fixed, the second concrete is poured to complete the construction of the stepped support foundation 107. Then, according to the support plan layout and the height difference between the ground and the bottom of the beam, a full-floor scaffolding 106 is set up, and a horizontal scissors brace is set every four rows of the support, and a scissors brace is set longitudinally at the edge of the scaffolding.

[0089] Subsequently, measurement and layout are carried out, and I-beams are laid on the ground as the foundation of the standardized temporary support 2; when erecting, the vertical poles 201 are erected first, among which the vertical poles 201 on the bridge side need to pass through the bridge deck 602 and stand on the distribution beam 105, and circular support plates 203 are pre-welded vertically at equal intervals within the elevation range of the bridge deck 602 of the bridge body 6, and then connecting rods 202 are welded between the vertical poles 201 for reinforcement.

[0090] The bottom formwork 5 is installed simultaneously. The installation of the bottom formwork 5 is mainly carried out by manual labor with mechanical coordination, and a pre-arch is set. After the installation of the bracket and the bottom formwork 5 is completed, a ballast test is carried out. The ballast test takes 1.2 times the sum of the box girder's own weight and the construction load as a graded load, and the load is unloaded after the settlement is stable.

[0091] Next, install the bridge deck reinforcement binding frame 3, first install the transverse frame 301, cross the bridge deck 602 and install it on the circular support plate 203 of the standardized temporary support 2 on both sides, then cut the longitudinal frame 302 according to the spacing after the transverse frame 301 is installed, and the longitudinal frame 302 is installed on the circular support plate 203 of the standardized temporary support 2 on the same side parallel to the lower chord 601, and is arranged in sections between the transverse frames 301.

[0092] The above-mentioned tire frame is used for steel bar binding construction, and the order of steel bar construction is end cross beam 605, lower chord 601, middle cross beam 606, and bridge deck 602. The steel bars of the bridge deck 602 are constructed layer by layer using a pre-set tire frame, and the longitudinal and transverse bridge deck steel bar binding tire frames 3 are installed synchronously layer by layer on the circular support plate 203; after the steel bar binding is completed, the longitudinal and transverse tire frames 301 are removed in time.

[0093] Each steel truss is manufactured in 11 sections in the factory according to the requirements of the design drawings. After being transported to the construction site, it is welded into 3 sections on site. The joints of each lifting section and the corresponding steel parts are welded and installed. After the welds pass the ultrasonic test, the first supplementary painting is carried out; then the sections are lifted into place on the top of the finalized temporary support 2; and then the steel truss joints are accurately connected according to the requirements of the drawings.

[0094] Then gradually install the inner mold, end mold and side mold, and reasonably set up reinforcing cross braces. The inner mold, end mold and side mold 1 are uniformly made of high-strength bamboo plywood; simultaneously install the prestressed pipe: the prestressed pipe is made of plastic corrugated pipe, and the corrugated pipe is extended by a larger corrugated pipe socket with a socket length of 20 to 30 cm. It is accurately positioned with a "well" shaped positioning frame, and the spacing between the positioning frames is 0.5 m.

[0095] After the above construction is completed, the bridge deck concrete construction platform 4 is set up. First, the transverse steel springboard 401 is installed across the bridge deck 602 on the transverse connecting rods 202 of the fixed temporary brackets 2 on both sides, and then the longitudinal steel springboard 402 is installed between the limit plates on the transverse steel springboard 401 to complete the platform construction. Using the bridge deck concrete construction platform 4, the concrete pouring is completed by pouring at full height at one time. The pouring sequence is the end beam 605, the lower chord 601, the middle beam 606, and the bridge deck 602 are poured symmetrically in layers; oblique layers, longitudinal segments, the segment length is controlled at 4-6m, the layer thickness does not exceed 30cm, and the vibrator is vibrated by attachment and insertion.

[0096] After the concrete curing is completed, the steel strand 10 is tensioned symmetrically at both ends, and the tensioning fixture 8 is installed in advance before tensioning to prevent accidental pressure relief; during the tensioning process, double control is implemented for the tensioning of the steel strand; after the prestressing is completed, grouting is carried out as soon as possible, and the surrounding area is cleaned after grouting, and the concrete at the beam end is roughened and sealed.

[0097] Finally, pour the concrete of the steel truss, first pour the concrete in the diagonal rod tube, then install the fixed hanger 12 on the diagonal rod of the steel truss, and use the fixed hanger 12 to pour the concrete in the upper chord rod 603 tube. The bracket can be removed after the concrete strength in the steel truss reaches 90% of the concrete grade. When removing the bracket, remove it from the beam end to the middle of the span, and the bracket should be removed symmetrically.

[0098] The process of this application is simple to operate, the construction efficiency and precision are improved, the high-altitude operation time is reduced, and no special equipment is required; less equipment and personnel are required, the labor intensity is low, and the site occupancy is small; the project cost is reduced; this method has achieved good results in the construction of engineering example projects, and has wide promotion and application value under similar conditions, and the economic and social benefits are very obvious.

[0099] It should be noted that some parts not described in detail in the present invention belong to the well-known technology in the art, or can be directly purchased from the market, and those skilled in the art can obtain them without creative work. The specific connection method is extremely widely used in this art or in daily life, and will not be described in detail here.

[0100] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0101] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0102] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0103] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0104] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0105] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. Steel tube concrete assembled truss composite beam construction system, characterized by: It includes scaffolding support system, standardized temporary support, bridge deck reinforcement tyre frame and bridge deck concrete construction platform; The scaffolding support system includes a steel pipe pile-supported scaffolding support system and a step-type scaffolding support system; the steel pipe pile-supported scaffolding support system is used in steep mountainous areas; the step-type scaffolding support system is used in gently sloping terrain; The steel pipe pile-supported scaffolding support system includes a cast-in-place cap, a steel pipe column, a lower crossbeam, a Bailey truss, a distribution beam and a full-floor scaffolding arranged in sequence from bottom to top; the cast-in-place cap is embedded in a steep mountain; The step-type scaffolding support system includes a step-type support foundation and a full-floor scaffolding; the step-type support foundation is formed by excavating the original soil into a step-like shape and casting it through a standardized step-by-step tie-form. The standardized step-by-step tie template includes side plates, a reversible template and a limit block; the side plates on both sides are vertically embedded in the original soil and are provided with a slide groove; the reversible template is erected in the slide groove of the side plate through the central end rods at both ends and is fixed by the limit block; The standardized temporary support comprises a vertical pole and a connecting rod; wherein one side of the vertical pole is arranged to penetrate the bridge deck, and circular support plates are arranged vertically and evenly spaced within the bridge deck elevation range of the bridge body; The bridge deck reinforcement binding frame includes a transverse frame and a longitudinal frame; the transverse frame is arranged across the bridge deck on the circular support plates of the fixed temporary support on both sides, and the longitudinal frame is arranged on the circular support plate of the fixed temporary support on the same side in parallel with the lower chord and is arranged in sections between the transverse frames; The bridge deck concrete construction platform includes a transverse steel springboard and a longitudinal steel springboard; the transverse steel springboard is arranged on the connecting rods of the fixed temporary brackets on both sides across the bridge deck, and the longitudinal steel springboard is arranged on the transverse steel springboard and is transversely fixed by a limit plate; A formwork is installed on the top of the scaffolding support system, and standardized temporary brackets are set on both sides; the bridge deck steel bar binding cradle set on the standardized temporary bracket is used to carry out steel bar operations; the bridge deck concrete construction platform set on the standardized temporary bracket is used to carry out concrete operations on the steel truss; the steel strands on the lower chord are tensioned by a tensioning fixture; the steel truss is poured with concrete by a grouting pipe on a fixed hanger.

2. The steel tube concrete assembled truss composite beam construction system according to claim 1 is characterized by: Hoop-type connectors are provided between the steel pipe columns.

3. The steel tube concrete assembled truss composite beam construction system according to claim 2 is characterized by: The top surface of the tensioning and fixing device is arc-shaped, and a lower edge plate is provided on one side, and the lower edge plate is anchored and connected to the side surface of the lower chord.

4. The steel tube concrete assembled truss composite beam construction system according to claim 3 is characterized by: The fixed hanger includes an oblique brace, a transverse plate and a limiting ring, wherein one oblique brace is supported on the steel truss by an end arc-shaped support plate, and the other oblique brace is fixed to the steel truss by an end clamp. The other ends of the two oblique braces are hingedly connected and are provided with a transverse plate, on which a limiting ring for positioning the grouting pipe is vertically provided.

5. The steel tube concrete assembled truss composite beam construction system according to claim 4 is characterized by: The bridge body includes a lower chord, a bridge deck, an upper chord, end diagonal bars, end cross beams, a middle cross beam and piers; the upper chord is positioned on the lower chord through a web; the lower chord is positioned on the cap beam of the pier through a permanent support; the bridge deck is arranged between the two lower chords; the end diagonal bars are arranged at both ends of the upper chord and are positioned and connected with the two ends of the lower chord; the end cross beams are arranged at both ends of the bridge deck; the middle cross beam is arranged in the middle position of the bridge deck.

6. The steel tube concrete assembled truss composite beam construction system according to claim 5 is characterized by: An auxiliary vertical rod is also provided; the auxiliary vertical rod abuts against the upper chord rod to limit position.

7. A method for constructing a steel tube concrete assembled truss composite beam, based on the steel tube concrete assembled truss composite beam construction system according to claim 6, characterized in that: The following steps are involved: S1. Foundation treatment: For steeper slopes, first excavate the original soil into steps, install standardized step-by-step tie templates on the original soil, where the flip templates are set at intervals of one step, and cast the step-type support foundation in two times; For steeper slopes, first construct a cast-in-place cap on the slope surface, set up steel pipe columns on the cast-in-place cap, lay the lower beam on the foundation of the steel pipe columns to hoist the Bailey truss, and install the distribution beam as the foundation of the full-floor scaffolding; For low dam-type slopes, directly fill and level them; S2. Full-floor scaffolding erection: According to the plan layout of the scaffolding and the height difference between the ground and the bottom of the beam, the full-floor scaffolding is configured and erected. A horizontal scissors brace is set every four rows of the scaffolding, and a scissors brace is set longitudinally on the edge of the scaffolding; S3. Installation of standardized temporary supports: Under the condition of too steep slope, the standardized temporary supports are directly erected on the distribution beam. Under other conditions, I-beams are directly set on the ground as the foundation of the standardized temporary supports. When erecting, the poles are first erected, of which the poles on the bridge side need to pass through the bridge deck and stand on the distribution beam, and circular support plates are pre-welded vertically at equal intervals within the bridge deck elevation range of the bridge body, and then tie rods are welded between the poles for reinforcement; S4. Bottom formwork installation: The bottom formwork installation is mainly carried out manually with mechanical coordination, and the pre-camber is set; S5. Installation of bridge deck reinforcement tyre frames: first install the transverse tyre frames, which are installed across the bridge deck on the circular support plates of the standardized temporary supports on both sides, and then cut the longitudinal tyre frames according to the spacing after the transverse tyre frames are installed. The longitudinal tyre frames are installed parallel to the lower chord on the circular support plates of the standardized temporary supports on the same side, and are arranged in sections between the transverse tyre frames; S6. Rebar binding construction: The order of reinforcement construction is end beam, lower chord, middle beam, bridge deck. The reinforcement of the bridge deck is constructed layer by layer using a pre-set cradle. The longitudinal and transverse bridge deck reinforcement binding cradles are installed synchronously layer by layer on the circular pallet, and can also be directly lifted layer by layer. S7, Steel truss hoisting: Each steel truss is divided into 11 sections in the factory according to the requirements of the design drawings, and then transported to the construction site and welded into three sections. The joints of each hoisting section and the corresponding steel parts are welded and installed. After the welds are qualified by ultrasonic testing, the first supplementary coating is carried out; then the sections are hoisted and placed in place on the top of the finalized temporary support; and the steel truss joints are accurately docked according to the requirements of the drawings; S8, Installation of inner mold, end mold and side mold: uniformly use high-strength bamboo plywood, gradually install the inner mold, end mold and side mold, and reasonably set strengthening cross braces; S9. Prestressed pipe installation: Prestressed pipes are made of plastic corrugated pipes, and the corrugated pipes are extended by a larger size corrugated pipe sleeve, and are accurately positioned with a "well" shaped positioning frame; S10. Construction platform of bridge deck concrete: first install the transverse steel springboard across the bridge deck on the transverse tie rods of the finalized temporary brackets on both sides, and then install the longitudinal steel springboard between the limit plates on the transverse steel springboard to complete the construction of the platform; S11, concrete pouring: using the bridge deck concrete construction platform, the concrete pouring is completed in one pouring at full height, and the pouring sequence is end beam, lower chord, middle beam, and bridge deck, which are poured symmetrically in layers; S12, tensioning, grouting, and anchor sealing: Install tensioning fixtures in advance before tensioning to prevent accidental pressure relief; implement double control of the tensioning of the strands during tensioning; grouting should be performed as soon as possible after the prestressing is completed, clean the surrounding area after grouting, and roughen the concrete at the beam end and anchor it using anchors; S13, Steel truss concrete pouring: First pour concrete into the diagonal rod pipe through the grouting pipe, then install a fixed hanger on the diagonal rod of the steel truss, and pour concrete into the upper chord rod pipe through the grouting pipe on the fixed hanger; S14. Removal of the support system: The support can be removed only after the concrete strength in the steel truss reaches 90% of the concrete grade. The support should be removed from the beam end to the middle of the span, and the removal should be done symmetrically.

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