Concrete supporting structure based on beam haunching and retard-bonded prestress and construction method

Abstract

The invention discloses a concrete supporting structure based on beam haunching and retard-bonded prestress and a construction method, and the supporting structure comprises a tensioning end side mold, a fixed end side mold and a middle side mold which are used for manufacturing a prestressed beam, and a haunching side mold used for haunching at the end side of the prestressed beam, the haunched beam haunched position side mold fixing mechanism is used for fixing the haunched side mold, the tensioning end prestressed tendon mounting assembly is arranged on the tensioning end side mold, the fixed end prestressed tendon mounting assembly is arranged on the fixed end side mold, and the prestressed tendons are arranged on the tensioning end side mold and the fixed end side mold. The haunched beam haunching position side mold fixing mechanism comprises haunched beam self-adaption U-shaped fixing clamps and a plurality of haunched beam haunching length adjusting units, wherein the haunched beam haunching length adjusting units are arranged between every two adjacent haunched beam self-adaption U-shaped fixing clamps in parallel at intervals from top to bottom. The haunching length adjusting unit of the haunched beam is adjusted to adapt to haunched side molds with different lengths, haunching of the prestressed beam is achieved, and then an operable space is provided for the tensioning end when the retard-bonded prestressed tendon is tensioned.

Description

Technical Field

[0001] The present invention belongs to the technical field of building construction, and more specifically, relates to a concrete support structure based on beam haunches and slow-bonding prestressing and a construction method. Background Art

[0002] Pre-tensioning and post-tensioning are the two main construction methods for prestressed concrete structures. The main disadvantages of pre-tensioning include: 1. It requires a special tensioning pedestal and a larger tensioning space, which increases the construction cost and limits its application in some projects. 2. The problems of misalignment and loosening of prestressed steel bars need to be properly solved to ensure the stability of the prestress. 3. Pre-tensioning is generally only suitable for prefabricated components with shorter lengths. For large components or prestressed steel bars arranged in curves, the construction difficulty will increase; the main disadvantages of post-tensioning include: 1. The bond between the prestressed steel bars and concrete is poor, which may lead to uneven distribution of prestress and affect the stress performance of the structure.

[0003] The slow-bonding prestressing technology is a new type of prestressing technology developed in recent years. It is the third prestressing system after the unbonded and bonded systems. The slow-bonding prestressing is similar to the unbonded prestressing. Compared with the bonded prestressing, the slow-bonding prestressing does not require the wearing of corrugated pipes and grouting, which reduces two complex processes, reduces the impact of on-site manual operations, and the construction quality is easy to be guaranteed. However, the following problems will be encountered during the construction of the slow-bonding prestressing tendons: 1. When the slow-bonding prestressing tendons are tensioned, the operating space at the tensioning end is narrow and difficult to operate; specifically, using the traditional tensioning method, when the end of the axilla beam is connected to a section of the beam that is in line with it, it can only be tensioned on the side of the axilla beam end. Not only is the space narrow, but it also affects the force of the prestressed tendons, and the overall quality cannot be guaranteed; 2. Because the side of the axilla beam is an inclined surface, the side form cannot withstand the positive pressure, resulting in the inability to use the entire tension screw to tie. The traditional method is to weld the screw to the main beam steel bar, and there is no more mature processing method. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a concrete support structure and construction method based on beam axils and slow-bonding prestressing, which solves the problem that the operating space at the tensioning end is narrow and difficult to operate when the slow-bonding prestressing tendons are tensioned by adding axils on the end of the prestressed beam; the problem that the side formwork cannot withstand the positive pressure and the whole tensioning screw cannot be used for tensioning because the side surface of the axil beam is an inclined surface is fixed by using the side formwork fixing mechanism at the axil of the axil beam to solve the problem; the side formwork of the axil beam with different lengths, heights and widths is fixed by using the adjustable function of the side formwork fixing device at the axil of the axil beam; the present invention does not need to open a screw hole in the middle of the side formwork of the axil beam, does not need welding, saves time and effort, reduces costs and increases efficiency; and can effectively solve the problems arising in the tensioning process of the prestressed tendons of the prestressed beam.

[0005] In order to achieve the above-mentioned purpose, one aspect of the present invention provides a concrete support structure based on beam axilla and slow-bonding prestressing, comprising a tensioning end side form, a fixed end side form, and an intermediate side form for making a prestressed beam, an axilla side form for axilla on the end of the prestressed beam, an axilla side form fixing mechanism for fixing the axilla side form, a tensioning end prestressed tendon installation component provided on the tensioning end side form and a fixed end prestressed tendon installation component provided on the fixed end side form, and prestressed tendons provided between the tensioning end prestressed tendon installation component and the fixed end prestressed tendon installation component; wherein,

[0006] The middle side form is arranged between the tensioning end side form and the fixed end side form; the side form fixing mechanism of the armpit beam includes an armpit beam adaptive U-shaped fixing card respectively arranged on the tensioning end side form, the fixed end side form and the armpit end of the middle side form, and a plurality of armpit beam and armpit length adjustment units arranged in parallel and spaced from top to bottom between two adjacent said armpit beam adaptive U-shaped fixing cards; prestressed beams of different widths and heights can be adapted by adjusting the armpit beam adaptive U-shaped fixing card; the armpit side form is respectively arranged between the tensioning end side form and the middle side form and between the middle side form and the fixed end side form; the armpit side form is adapted to different lengths by adjusting the armpit beam and armpit length adjustment unit, thereby realizing the armpit of the prestressed beam; the armpit at the end of the prestressed beam is provided with an operable space for the tensioning end when the prestressed tendons are tensioned for slow bonding.

[0007] Further, the tensioning end prestressed tendon installation assembly includes a clip anchor, a first pressure-bearing plate, and a first spiral tendon arranged on the side of the tensioning end side mold;

[0008] The centers of the clip anchor and the first pressure plate are collinear;

[0009] The clip is anchored on a side of the second side plate close to the first side plate;

[0010] The first pressure-bearing plate is arranged on a side of the clip anchor away from the second side plate;

[0011] The first spiral rib is arranged on a side of the first pressure bearing plate away from the clip anchor;

[0012] The tensioning end of the prestressed tendon passes through the first spiral tendon, the first bearing plate, the clip anchor and the second side plate in sequence and extends to the other side of the second side plate;

[0013] The fixed end of the prestressed tendon is fixed to the fixed end side mold through the fixed end prestressed tendon installation assembly.

[0014] Furthermore, the fixed end prestressed tendon installation assembly includes a second pressure-bearing plate and a second spiral tendon arranged on the fixed end side mold near the middle side mold, and an extrusion anchor arranged on the fixed end side mold away from the middle side mold;

[0015] The centers of the second pressure bearing plate and the extrusion anchor are co-linear and are relatively arranged on both sides of the template of the fixed end side mold;

[0016] The second spiral rib is arranged on a side of the second pressure bearing plate away from the extrusion anchor;

[0017] The fixed end of the prestressed tendon passes through the second spiral tendon, the second pressure-bearing plate, the template of the fixed end side template and is fixed to the extrusion anchor in sequence.

[0018] Furthermore, the prestressed tendons include steel strands, a slow-bonding adhesive coated on the steel strands, and an outer PE layer disposed outside the slow-bonding adhesive;

[0019] The surface of the outer PE layer is provided with uneven indentations.

[0020] Furthermore, the self-adaptive U-shaped fixing clip of the axil beam is provided with a tension screw and a U-shaped clip lifting lug; the U-shaped clip lifting lugs are evenly spaced apart on the sides of the prestressed beam height adjustment unit.

[0021] Furthermore, the self-adaptive U-shaped fixing card with haunch beam includes a prestressed beam width adjustment unit and a prestressed beam height adjustment unit vertically arranged at both ends of the prestressed beam width adjustment unit;

[0022] The prestressed beam width adjustment unit comprises a first large head end and a first small head end which are movably plugged in;

[0023] The prestressed beam height adjustment unit comprises a second large end and a second small end which are movably plugged and arranged from top to bottom;

[0024] The second large end and the second small end of both sides are provided with an adjustment slot that runs through from top to bottom; the lengths and positions of the adjustment slots on both sides are corresponding;

[0025] By adjusting the insertion depth of the first large head end and the first small head end, the prestressed beams of different widths can be adapted; by synchronously adjusting the insertion depth of the second large head end and the second small head end, the prestressed beams of different heights can be adapted;

[0026] The two ends of the tension screw rod pass through the adjustment slots on both sides respectively, and the two prestressed beam height adjustment units are fixed by locking nuts.

[0027] Furthermore, the axil beam axil length adjustment unit comprises a plurality of groups of square tube big end ends and square tube small end ends which are movably plugged and arranged; the ends of the square tube big end end and the square tube small end away from each other are respectively provided with square tube lifting ears;

[0028] The number and position of the square tube lifting ears are adapted to the U-shaped clamping ears; the square tube lifting ears at both ends of the armpit beam and the armpit length adjustment unit are fixed to the U-shaped clamping ears at the corresponding position by means of latches, so as to fix the armpit beam and the armpit length adjustment unit on the side of the armpit side mold; the different sizes of armpit side molds and armpit beams can be adapted by adjusting the insertion depth of the large end and the small end of the square tube.

[0029] A second aspect of the present invention provides a construction method of slow-bonding prestressed concrete based on beam haunches, which is implemented by applying the concrete support structure based on beam haunches and slow-bonding prestressed concrete, and includes the following steps:

[0030] S1: Install the tensioning end side form, the fixed end side form, and the middle side form in the construction area according to the design requirements; install the armpit side form at the armpit portion between the tensioning end side form, the middle side form, and the fixed end side form to ensure that the armpit ends of each side form fit tightly;

[0031] S2: Installing the side mold fixing mechanism of the side mold ...

[0032] S3: Installing the tensioning end prestressed tendon installation assembly on the tensioning end side form, installing the fixed end prestressed tendon installation assembly on the fixed end side form, and fixing the two ends of the prestressed tendon to the tensioning end prestressed tendon installation assembly and the fixed end prestressed tendon installation assembly respectively;

[0033] S4: fixed brackets are arranged at intervals on the prestressed tendons to position the prestressed tendons in a curve;

[0034] S5: pouring concrete. When the concrete reaches 85% of the design strength, the beam side formwork is removed and the prestressed tendons are tensioned and anchored;

[0035] S6: After the prestressed tendons are tensioned and anchored, cut off the exposed excess prestressed tendons; clean the tensioning end and its surroundings, seal the tensioning end with the same grade of micro-expanding fine stone concrete and vibrate it to make it dense, and complete the production of the slow-bonding prestressed concrete structure based on beam axils.

[0036] Furthermore, in step S2, an armpit beam and an armpit side mold fixing mechanism are installed on the side of the armpit side mold, including:

[0037] S21: according to the width and height of the prestressed beam, an adaptive U-shaped fixing clip for the armpit beam is installed at the ends of the armpit of the tensioning end side form, the middle side form and the fixed end side form respectively;

[0038] S22: According to the length of the side form, the side beam length adjustment units are respectively installed between two adjacent side beam adaptive U-shaped fixing cards to achieve effective fixation of the side form; ensuring that the side form is stable and will not be displaced during the concrete pouring process.

[0039] Furthermore, the step S3 of installing the tensioning end prestressed tendon installation assembly on the tensioning end side form includes:

[0040] Install a clip anchor on the second side plate of the tensioning end side formwork near the first side plate, ensuring that the clip anchor is accurately positioned and aligned with the tensioning direction of the prestressed tendons;

[0041] Install a first pressure plate on the side of the clip anchor close to the middle side form;

[0042] Install a first spiral rib on one side of the first pressure-bearing plate close to the middle side mold;

[0043] The step S3 of installing the fixed end prestressed tendon installation assembly on the fixed end side formwork includes:

[0044] Install a second pressure plate on the side of the fixed end side mold close to the middle side mold, and install an extrusion anchor on the side away from the middle side mold, ensuring that their center lines are collinear and aligned;

[0045] Installing a second spiral rib on a side of the second pressure-bearing plate away from the extrusion anchor;

[0046] The step S3 of fixing the two ends of the prestressed tendon to the tensioning end prestressed tendon installation assembly and the fixed end prestressed tendon installation assembly respectively includes:

[0047] Pass the tensioning end of the prestressed tendon through the first spiral tendon, the first bearing plate and the clip anchor to ensure that the tensioning end of the prestressed tendon is fixed in the clip anchor;

[0048] The fixed end of the prestressed tendon is passed through the second spiral tendon and the second bearing plate, and then fixed in the extrusion anchor.

[0049] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0050] The present invention discloses a concrete support structure and construction method based on beam axils and slow-bonding prestressing. By adding axils on the end side of the prestressed beam, the problem that the operating space at the tensioning end is narrow and difficult to operate when the slow-bonding prestressing tendons are tensioned is solved; by using the axil beam axil side formwork fixing mechanism to fix the axil side formwork, there is no need to open a screw hole in the middle of the axil beam side formwork, and no welding is required, which saves time and effort, reduces costs and increases efficiency, and solves the problem that the side formwork cannot withstand positive pressure due to the inclined side of the axil beam, resulting in the inability to use a whole tension screw for tensioning; by using the adjustable function of the axil beam axil side formwork fixing device, the axil side formworks with different lengths, heights and widths can be fixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a schematic diagram of the overall arrangement of a concrete support structure based on beam haunches and slow-bonding prestressing according to an embodiment of the present invention;

[0052] Figure 2 It is a schematic diagram of the local arrangement structure of a concrete support structure based on beam haunches and slow-bonding prestressing according to an embodiment of the present invention;

[0053] Figure 3 It is a structural schematic diagram of a prestressed tendon installation assembly at the tensioning end of a concrete support structure based on beam haunches and slow-bonding prestressing according to an embodiment of the present invention;

[0054] Figure 4 It is a structural schematic diagram of a fixed-end prestressed tendon installation assembly of a concrete support structure based on beam haunch addition and slow-bonding prestressing according to an embodiment of the present invention;

[0055] Figure 5 It is a structural schematic diagram of an adaptive U-shaped fixing clip for a haunch beam of a concrete support structure based on haunch beam and slow-bonding prestressing according to an embodiment of the present invention;

[0056] Figure 6 It is a partially enlarged schematic diagram of a beam and haunch length adjustment unit of a concrete support structure based on beam haunch and slow-bonding prestressing according to an embodiment of the present invention;

[0057] Figure 7 A concrete support structure based on beam haunch and slow-bonding prestressing according to an embodiment of the present invention Figure 1 A partial enlarged schematic diagram of

[0058] Figure 8 The present invention is a flowchart of a concrete construction method based on beam haunch addition and slow-bonding prestressing according to an embodiment of the present invention.

[0059] In all the drawings, the same reference numerals represent the same technical features, specifically: 1-tension end side mold, 11-first side plate, 12-second side plate, 2-middle side mold, 21-third side plate, 22-fourth side plate, 3-axillary beam and axillary side mold fixing mechanism, 31-axillary beam adaptive U-shaped fixing card, 311-first large head end, 312-first small head end, 313-second large head end, 314-second small head end, 315-adjustment slot, 316-locking nut, 301-tension screw, 302- U-shaped clamping ear, 32-axillary beam and axillary length adjustment unit, 321-square tube big end, 322-square tube small end, 323-square tube lifting ear, 324-pin, 4-axillary formwork, 5-tensioning end prestressed tendon installation assembly, 51-clip anchor, 52-first pressure plate, 53-first spiral tendon, 6-fixed end prestressed tendon installation assembly, 61-second pressure plate, 62-second spiral tendon, 63-extrusion anchor, 7-fixed end side formwork, 8-prestressed tendon, 9-axillary beam, 10-prestressed tendon construction operation position. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0061] like Figure 1-Figure 7As shown, one aspect of the present invention provides a slow-bonding prestressed concrete structure based on beam axils, comprising a tensioning end side form 1 for making a prestressed beam, a fixed end side form 7, an intermediate side form 2, an axil side form 4 for axilizing the end of the prestressed beam, an axil side form fixing mechanism 3 for fixing the axil side form 4, a tensioning end prestressed tendon installation component 5 arranged on the tensioning end side form 1, and a fixed end prestressed tendon installation component 6 arranged on the fixed end side form 7; wherein the intermediate side form 2 is arranged on the tensioning end side form The side mold 3 for adding axillary beams is between the tensioning end side mold 1 and the fixed end side mold 7; the side mold fixing mechanism 3 for adding axillary beams includes an axillary beam adaptive U-shaped fixing card 31 respectively arranged at the end of the axillary beams on the tensioning end side mold 1, the fixed end side mold 7 and the middle side mold 2, and a plurality of axillary beams and axillary length adjustment units 32 arranged parallelly and spaced from top to bottom between two adjacent axillary beams adaptive U-shaped fixing cards 31; the axillary beams adaptive U-shaped fixing cards 31 are adjusted to adapt to prestressed beams of different widths and heights; the side mold 4 for adding axillary beams is between the tensioning end side mold 1 The middle side formwork 2 and the middle side formwork 2 are respectively arranged between the middle side formwork 2 and the fixed end side formwork 7; the tensioning end side formwork 1 and the middle side formwork 2 are fixed as a whole with the tensioning side side formwork 4 through the armpit beam and armpit side formwork fixing mechanism 3; the fixed end side formwork 7 and the middle side formwork 2 are fixed as a whole with the fixed side armpit side formwork 4 through the armpit beam and armpit side formwork fixing mechanism 3; the armpit beam and armpit length adjustment unit 32 are adjusted to adapt to different lengths of the armpit side formwork 4, thereby realizing the armpit of the prestressed beam; by adding the armpit at the end of the prestressed beam To provide an operable space for the tensioning end when the slow-bonding prestressed tendons are tensioned; the present invention solves the problem that the operable space at the tensioning end is narrow and difficult to operate when the slow-bonding prestressed tendons are tensioned by adding an armpit on the end of the prestressed beam; the armpit side formwork fixing mechanism 3 is used to fix the armpit side formwork 4 to solve the problem that the side formwork cannot withstand positive pressure due to the inclined side of the armpit beam, resulting in the inability to use the entire tension screw for tensioning; the adjustable function of the armpit side formwork fixing device of the armpit beam and the armpit side formwork can be used to fix the armpit side formwork 4 of different lengths, heights and widths.

[0062] Furthermore, if Figure 1-Figure 7As shown, the tensioning end prestressed tendon installation assembly 5 includes a clip anchor 51, a first pressure plate 52, a first spiral tendon 53, and a prestressed tendon 8 arranged on the side of the tensioning end side form 1; the centers of the clip anchor 51 and the first pressure plate 52 are collinear; the clip anchor 51 is arranged on the side of the second side plate 12 close to the first side plate 11; the first pressure plate 52 is arranged on the side of the clip anchor 51 away from the second side plate 12; the first spiral tendon 53 is arranged on the side of the first pressure plate 52 away from the clip anchor 51; the tensioning end of the prestressed tendon 8 passes through the first spiral tendon 53, the first pressure plate 52, the clip anchor 51 and the second side plate 12 in sequence and extends to the other side of the second side plate 12; the fixed end of the prestressed tendon 8 is fixed to the fixed end side form 7 through the fixed end prestressed tendon installation assembly 6.

[0063] Furthermore, if Figure 1-Figure 7 As shown, the fixed-end prestressed tendon installation assembly 6 includes a second pressure plate 61 and a second spiral tendon 62 arranged on the fixed-end side form 7 close to the middle side form 2, and an extrusion anchor 63 arranged on the fixed-end side form 7 away from the middle side form 2; the centers of the second pressure plate 61 and the extrusion anchor 64 are colinear and relatively arranged on both sides of the formwork of the fixed-end side form 7; the second spiral tendon 62 is arranged on the side of the second pressure plate 61 away from the extrusion anchor 64, and the fixed end of the prestressed tendon 8 is fixed through the second spiral tendon 62, the second pressure plate 61, the formwork of the fixed-end side form 7 and the center of the extrusion anchor 63 in sequence.

[0064] Furthermore, in an embodiment of the present invention, the prestressed tendon 8 includes a steel strand, a retarding adhesive coated on the steel strand and an outer PE layer arranged outside the retarding adhesive; the surface of the outer PE layer is provided with uneven indentations; the rib height of the indentation is not less than 2 mm, and the rib is filled with the retarding adhesive. When the retarding prestressed tendon is tensioned, when the end of the axil beam is connected to a beam that is colinear with it, it can only be tensioned on the side of the end of the axil beam. The operating space at the tensioning end is narrow and difficult to operate. The two ends of the beam are axilized to facilitate construction when the prestressed tendons pass through the axilized parts.

[0065] Furthermore, if Figure 1-Figure 7 As shown, the tensioning end side form 1 and the fixed end side form 7 have the same structure; the tensioning end side form 1 includes a first side plate 11 and a second side plate 12 arranged in parallel and spaced apart; the middle side form 2 includes a third side plate 21 and a fourth side plate 22 arranged in parallel and spaced apart; the side form 4 with added armpit beams is arranged between the first side plate 11 and the third side plate 21; different side form 31 with added armpit beams are adaptively U-shaped fixing cards that fix the first side plate 11 and the second side plate 12 as a whole, and fix the third side plate 21 and the fourth side plate 22 as a whole.

[0066] Furthermore, if Figure 1-Figure 7As shown, the self-adaptive U-shaped fixing card 31 with a side beam is provided with a tension screw 301 and a U-shaped card lifting ear 302; the self-adaptive U-shaped fixing card 31 with a side beam includes a prestressed beam width adjustment unit and a prestressed beam height adjustment unit vertically arranged at both ends of the prestressed beam width adjustment unit; the prestressed beam width adjustment unit includes a first large head end 311 and a first small head end 312 that can be movably plugged in; the prestressed beam height adjustment unit includes a second large head end 313 and a second small head end 314 that can be movably plugged in from top to bottom; the second large head end 313 and the second small head end 314 on both sides are provided with an adjustment Sectional groove 315; the lengths and positions of the adjustment grooves 315 on both sides are corresponding; after the length of the prestressed beam width adjustment unit is adjusted appropriately, the two ends of the tension screw 301 are respectively passed through the adjustment grooves 315 on both sides, and the two prestressed beam height adjustment units are fixed by locking nuts 316; the number of the tension screws 301 is determined according to actual needs; by adjusting the insertion depth of the first large head end 311 and the first small head end 312, it can adapt to the production of prestressed beams of different widths; by synchronously adjusting the insertion depth of the second large head end 313 and the second small head end 314, it can adapt to the production of prestressed beams of different heights.

[0067] Furthermore, if Figure 1-Figure 7 As shown, the U-shaped clamping ears 302 are evenly spaced and arranged on the side of the prestressed beam height adjustment unit; the armpit beam and armpit length adjustment unit 32 includes a plurality of groups of square tube big end ends 321 and square tube small end ends 322 that are movably plugged in; the square tube big end ends 321 and the square tube small end ends 322 are respectively provided with square tube lifting ears 323 at the ends away from each other; the square tube lifting ears 323 are adapted to the number and position of the U-shaped clamping ears 302; the square tube lifting ears 323 at both ends of the armpit beam and armpit length adjustment unit 32 are fixed to the U-shaped clamping ears 302 at the corresponding position by the latch 324, so as to realize the fixation of the armpit beam and armpit length adjustment unit 32 on the side of the armpit side mold 4; the insertion depth of the square tube big end 321 and the square tube small end 322 is adjusted to adapt to the armpit side molds 4 and armpit beams 9 of different sizes.

[0068] The present invention sleeves the first large head end 311 at the bottom of the armpit beam adaptive U-shaped fixing card 31 of the armpit beam and the armpit side formwork fixing mechanism 3 onto the first small head end 312, which is suitable for prestressed beams of different widths; sleeves the second large head ends 313 on the two armpit beam adaptive U-shaped fixing cards 31 onto the second small head end 314, respectively clamps the armpit beam and the armpit end side forms of the tensioning end side form 1 and the middle side form 2, and adjusts the insertion depth between the two, so as to be suitable for prestressed beams of different heights; passes the tensioning screws 301 through the adjustment grooves 315 on both sides, and tightens the locking nuts 316; sleeves the large head end 321 of the square tube onto the small head end 322 of the square tube, and adjusts the insertion depth between the two, so as to adapt to different armpit beam and armpit lengths, connects the U-shaped card hanging ears 33 at both ends of the armpit beam adaptive U-shaped fixing card 31 with the square tube hanging ears 323, and inserts the pin 324 to achieve the fixing effect on the armpit beam and the armpit side form 4.

[0069] like Figure 8 As shown, the second aspect of the present invention provides a construction method of a concrete support structure based on beam haunches and slow-bonding prestressing, which is implemented by applying the concrete support structure based on beam haunches and slow-bonding prestressing, and includes the following steps:

[0070] S1: Install the tensioning end side mold 1, the fixed end side mold 7, and the middle side mold 2 in the construction area according to the design requirements; install the armpit side mold 4 at the armpit portion between the tensioning end side mold 1, the middle side mold 2, and the fixed end side mold 7, and ensure that the armpit side mold 4 is tightly fitted with the armpit end of the tensioning end side mold 1, the fixed end side mold 7, or the middle side mold 2 to form the shape of the armpit portion;

[0071] S2: Installing the side mold fixing mechanism 3 of the side mold 4 on the side of the side mold 4;

[0072] S3: Install the tensioning end prestressed tendon installation assembly 5 on the tensioning end side mold 1, install the fixed end prestressed tendon installation assembly 6 on the fixed end side mold 7, and fix the two ends of the prestressed tendon 8 to the tensioning end prestressed tendon installation assembly 5 and the fixed end prestressed tendon installation assembly 6 respectively;

[0073] S4: fixing brackets are arranged at intervals on the prestressed tendons 4 to perform curve positioning on the prestressed tendons 4;

[0074] S5: pouring concrete, after the concrete reaches 85% of the design strength, removing the beam side formwork, and tensioning and anchoring the prestressed tendons at the corresponding prestressed tendon construction operation position 10;

[0075] S6: After the prestressed tendons are tensioned and anchored, cut off the exposed excess prestressed tendons; clean the tensioning end and its surroundings, seal the tensioning end with the same grade of micro-expanding fine stone concrete and vibrate it to make it dense, and complete the production of the slow-bonding prestressed concrete structure based on beam axils.

[0076] Furthermore, in step S2, an armpit beam and armpit side mold fixing mechanism 3 is installed on the side of the armpit side mold 4, including:

[0077] S21: according to the width and height of the prestressed beam, the end of the tensioning end side form 1, the middle side form 2 and the fixed end side form 7 are respectively installed with the side beam self-adaptive U-shaped fixing clip 31;

[0078] S22: installing the armpit length adjustment units 32 between two adjacent armpit beam adaptive U-shaped fixing cards 31 according to the length of the armpit side mold 4, so as to effectively fix the armpit side mold 4.

[0079] The step S21 of installing the self-adaptive U-shaped fixing clips 31 of the side form 1 of the tensioning end, the middle side form 2 and the side form 7 of the fixed end according to the width and height of the prestressed beam comprises the following steps:

[0080] S211: sleeve the first large end 311 onto the first small end 312, and adjust the sleeve depth of the first large end 311 onto the first small end 312 according to the width of the prestressed beam; sleeve the second large end 313 onto the second small end 314, and adjust the sleeve depth of the second large end 313 onto the second small end 314 according to the height of the prestressed beam, so as to achieve self-adaptation of prestressed beams of different widths and heights;

[0081] S212: Use the tension screw 301 and the locking nut 316 to fix the two prestressed beam height adjustment units in appropriate positions;

[0082] Furthermore, the step S22 includes installing the armpit length adjustment unit 32 between two adjacent armpit beam adaptive U-shaped fixing cards 31 according to the length of the armpit side mold 4; comprising:

[0083] S221: Put the large end 321 of the square tube on the small end 322 of the square tube, and adjust the insertion depth between the two according to the length of the haunch of the haunch beam; ensure that the haunch length adjustment unit 32 can adapt to the haunch side molds 4 and haunch beams 9 of different sizes;

[0084] S222: Connect the U-shaped card ear 302 on the axil beam adaptive U-shaped fixing card 31 with the square tube ear 323 on the axil beam axil length adjustment unit 32, and use the pin 324 to fix the square tube ear 323 and the U-shaped card ear 302 to achieve the fixation of the axil beam axil length adjustment unit 32 on the side of the axil side form 4; ensure that the axil side form 4 is stable and will not be displaced during the concrete pouring process.

[0085] Furthermore, the step S3 of installing the tensioning end prestressed tendon installation assembly 5 on the tensioning end side form 1 includes:

[0086] Install a clip anchor 51 on the second side plate 12 of the tensioning end side form 1 close to the first side plate 11 to ensure that the clip anchor 51 is positioned accurately and aligned with the tensioning direction of the prestressed tendon 8;

[0087] A first pressure plate 52 is installed on the side of the clip anchor 51 close to the middle side mold 2 to ensure that it can withstand the force during the tensioning process;

[0088] A first spiral rib 53 is installed on the side of the first pressure plate 52 close to the middle side mold 2 to ensure that sufficient friction can be provided during tensioning.

[0089] The step S3 of installing the fixed end prestressed tendon installation assembly 6 on the fixed end side form 7 includes:

[0090] A second pressure plate 61 is installed on the side of the fixed end side mold 7 close to the middle side mold 2, and an extrusion anchor 63 is installed on the side away from the middle side mold 2, ensuring that their center lines are collinear and aligned;

[0091] A second spiral rib 62 is installed on a side of the second pressure-bearing plate 61 away from the extrusion anchor 64 to ensure that sufficient friction can be provided during tensioning.

[0092] The process of fixing the two ends of the prestressed tendon 8 to the tensioning end prestressed tendon installation assembly 5 and the fixed end prestressed tendon installation assembly 6 in step S3 includes:

[0093] Pass the tensioned end of the prestressed tendon through the first spiral tendon 53, the first pressure plate 52 and the clip anchor 51 to ensure that the tensioned end of the prestressed tendon 8 is fixed in the clip anchor 51;

[0094] The fixed end of the prestressed tendon 8 passes through the second spiral tendon 62 and the second pressure-bearing plate 61 , and then is fixed in the extrusion anchor 63 .

[0095] Furthermore, in step S4, a fixed bracket of the prestressed tendon 4 is set according to the requirements of the design drawings to ensure the curved positioning of the prestressed tendon 4. When there is a conflict between the positions of ordinary steel bars or other pipelines, the accuracy of the position of the prestressed tendon 4 should be ensured first.

[0096] Furthermore, in step S5, during the vibration process, the concrete behind the tensioning end pad must be vibrated and compacted to prevent accidents during tensioning, but the vibrating rod must not touch the prestressed tendons for a long time to prevent damage to the outer PE. The concrete maintenance of the prestressed beam should be strengthened to prevent early shrinkage cracks before tensioning; stress control and strain verification methods should be used when tensioning the prestressed tendons; records of on-site prestressing should be kept during construction; all supports under the prestressed beams must not be removed until the prestressing of the prestressed tendons is completed.

[0097] Furthermore, after the prestressed tendons are tensioned in step S6, the end sealing work must be done strictly, the excess steel strands can be cut off with a grinding wheel, and the length of the remaining exposed steel strands must not be less than 30 mm. Arc cutting is strictly prohibited.

[0098] The invention improves the bearing capacity and crack resistance of the concrete structure by adopting the technology of slow-bonding prestressing with added axilla beams; by applying tension to the steel bars in advance, the concrete is placed in a compressive state under the action of the load, thereby enhancing the overall performance of the structure; the invention can be applicable to the construction of large and complex prestressed beam structures; the design of adding axilla beams can more effectively disperse the load and improve the stability of the structure; the application of slow-bonding technology can reduce the fluidity and deformation of concrete during the construction process, and help to ensure the position stability of the prestressed tendons; the invention is easy to construct, combines traditional prestressing technology with modern concrete technology, has a simple construction process, and is easy to operate.

[0099] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A concrete support structure based on beam haunch and slow-bond prestressing, characterized in that: The invention comprises a tensioning end side form (1), a fixed end side form (7), and an intermediate side form (2) for manufacturing a prestressed beam, an axillary side form (4) for adding an axillary to the end of the prestressed beam, an axillary side form fixing mechanism (3) for fixing the axillary side form (4), a tensioning end prestressed tendon installation component (5) arranged on the tensioning end side form (1), and a fixed end prestressed tendon installation component (6) arranged on the fixed end side form (7), and a prestressed tendon (8) arranged between the tensioning end prestressed tendon installation component (5) and the fixed end prestressed tendon installation component (6); wherein: The intermediate side mold (2) is arranged between the tensioning end side mold (1) and the fixed end side mold (7); the side mold fixing mechanism (3) for adding axillary beams comprises axillary beams adaptive U-shaped fixing card (31) respectively arranged at the tensioning end side mold (1), the fixed end side mold (7) and the axillary end of the intermediate side mold (2), and a plurality of axillary beams adaptive U-shaped fixing cards (31) arranged in parallel and spaced from top to bottom between two adjacent axillary beams adaptive U-shaped fixing cards (31); by adjusting the axillary beams adaptive U-shaped fixing cards (31), the axillary beams adaptive U-shaped fixing cards (31) are adjusted to adjust the length of the axillary beams adaptive U-shaped fixing cards (31). The axil beam self-adaptive U-shaped fixing card (31) is adapted to prestressed beams of different widths and heights; the axil side form (4) is respectively arranged between the tensioning end side form (1) and the middle side form (2) and between the middle side form (2) and the fixed end side form (7); the axil side form (4) of different lengths is adapted by adjusting the axil length adjustment unit (32) of the axil beam, thereby realizing the axil of the prestressed beam; and the axil at the end of the prestressed beam is provided with an operable space for the tensioning end when the prestressed tendons are tensioned to slow down the bonding.

2. A concrete support structure based on beam haunch and slow-bonding prestressing according to claim 1, characterized in that: The tensioning end prestressed tendon installation assembly (5) comprises a clip anchor (51) arranged on the side of the tensioning end side mold (1), a first pressure bearing plate (52), and a first spiral tendon (53); The centers of the clip anchor (51) and the first pressure-bearing plate (52) are collinear; The clip anchor (51) is arranged on a side of the second side plate (12) close to the first side plate (11); The first pressure-bearing plate (52) is arranged on a side of the clip anchor (51) away from the second side plate (12); The first spiral rib (53) is arranged on a side of the first pressure-bearing plate (52) away from the clip anchor (51); The tensioning end of the prestressed tendon (8) passes through the first spiral tendon (53), the first pressure-bearing plate (52), the clip anchor (51) and the second side plate (12) in sequence and extends to the other side of the second side plate (12); The fixed end of the prestressed tendon (8) is fixed to the fixed end side mold (7) via the fixed end prestressed tendon installation assembly (6).

3. A concrete support structure based on beam haunch and slow-bonding prestressing according to claim 2, characterized in that: The fixed end prestressed tendon installation assembly (6) comprises a second pressure-bearing plate (61) and a second spiral tendon (62) arranged on the fixed end side mold (7) close to the middle side mold (2), and an extrusion anchor (63) arranged on the fixed end side mold (7) away from the middle side mold (2); The centers of the second pressure-bearing plate (61) and the extrusion anchor (64) are collinear and are relatively arranged on two sides of the template of the fixed end side mold (7); The second spiral rib (62) is arranged on a side of the second pressure-bearing plate (61) away from the extrusion anchor (64); The fixed end of the prestressed tendon (8) passes through the second spiral tendon (62), the second pressure-bearing plate (61), the template of the fixed end side template (7) and the extrusion anchor (63) in sequence and is fixed.

4. A concrete support structure based on beam haunch addition and slow-bonding prestressing according to any one of claims 1 to 3, characterized in that: The prestressed tendons (8) include steel strands, a slow-bonding adhesive coated on the steel strands, and an outer PE layer arranged outside the slow-bonding adhesive; The surface of the outer PE layer is provided with uneven indentations.

5. A concrete support structure based on beam haunch addition and slow-bonding prestressing according to any one of claims 1 to 3, characterized in that: The self-adaptive U-shaped fixing clip (31) for the added haunch beam is provided with a tensioning screw (301) and a U-shaped clip lifting lug (302); the U-shaped clip lifting lugs (302) are evenly spaced and arranged on the side of the prestressed beam height adjustment unit.

6. A concrete support structure based on beam haunch and slow-bonding prestressing according to claim 5, characterized in that: The self-adaptive U-shaped fixing card (31) with added haunch beams comprises a prestressed beam width adjustment unit and prestressed beam height adjustment units vertically arranged at both ends of the prestressed beam width adjustment unit; The prestressed beam width adjustment unit comprises a first large head end (311) and a first small head end (312) which are movably plugged in; The prestressed beam height adjustment unit comprises a second large end (313) and a second small end (314) which are movably plugged and arranged from top to bottom; The second large end (313) and the second small end (314) on both sides are provided with an adjustment groove (315) that passes through from top to bottom; the lengths and positions of the adjustment grooves (315) on both sides are corresponding; By adjusting the insertion depth of the first large head end (311) and the first small head end (312), prestressed beams of different widths can be accommodated; by synchronously adjusting the insertion depth of the second large head end (313) and the second small head end (314), prestressed beams of different heights can be accommodated; The two ends of the tension screw rod (301) pass through the adjustment slots (315) on both sides respectively, and the two prestressed beam height adjustment units are fixed by locking nuts (316).

7. A concrete support structure based on beam haunch and slow-bonding prestressing according to claim 6, characterized in that: The axil beam axil length adjustment unit (32) comprises a plurality of groups of square tube large ends (321) and square tube small ends (322) that are movably plugged and arranged; the ends of the square tube large ends (321) and the square tube small ends (322) that are away from each other are respectively provided with square tube lifting ears (323); The number and position of the square tube lifting ears (323) are compatible with the U-shaped clamping ears (302); the square tube lifting ears (323) at both ends of the axillary beam and axillary length adjustment unit (32) are fixed to the U-shaped clamping ears (302) at the corresponding position by means of a latch (324), so that the axillary beam and axillary length adjustment unit (32) is fixed to the side of the axillary side mold (4); and the axillary side molds (4) and axillary beams (10) of different sizes are adapted by adjusting the insertion depth of the square tube large end (321) and the square tube small end (322).

8. A construction method of slow-bonding prestressed concrete based on beam haunch addition, characterized in that: The method is implemented by using the concrete support structure based on beam haunches and slow-bonding prestressing as described in any one of claims 1 to 7, comprising the following steps: S1: Install the tensioning end side form (1), the fixed end side form (7), and the middle side form (2) in the construction area according to the design requirements; install the side form (4) at the armpit portion between the tensioning end side form (1), the middle side form (2), and the fixed end side form (7), and ensure that the armpit ends of each side form are tightly fitted; S2: installing an axillary beam and axillary side mold fixing mechanism (3) on the side of the axillary side mold (4); S3: Installing a tensioning end prestressed tendon installation component (5) on the tensioning end side mold (1), installing a fixed end prestressed tendon installation component (6) on the fixed end side mold (7), and fixing the two ends of the prestressed tendon (8) to the tensioning end prestressed tendon installation component (5) and the fixed end prestressed tendon installation component (6) respectively; S4: fixing brackets are arranged at intervals on the prestressed tendons (4) to position the prestressed tendons (4) in a curved manner; S5: pouring concrete. When the concrete reaches 85% of the design strength, the beam side formwork is removed and the prestressed tendons are tensioned and anchored; S6: After the prestressed tendons are tensioned and anchored, cut off the exposed excess prestressed tendons; clean the tensioning end and its surroundings, seal the tensioning end with the same grade of micro-expanding fine stone concrete and vibrate it to make it dense, and complete the production of the slow-bonding prestressed concrete structure based on beam axils.

9. A method for constructing slow-bonding prestressed concrete based on beam haunch addition according to claim 8, characterized in that: In step S2, an armpit beam and armpit side mold fixing mechanism (3) is installed on the side of the armpit side mold (4), comprising: S21: according to the width and height of the prestressed beam, respectively install the axil beam adaptive U-shaped fixing clips (31) at the ends of the axil of the tensioning end side form (1), the middle side form (2) and the fixed end side form (7); S22: installing the axil length adjustment unit (32) between two adjacent axil beam adaptive U-shaped fixing clips (31) according to the length of the axil side form (4), so as to effectively fix the axil side form (4); ensuring that the axil side form (4) is stable and will not be displaced during the concrete pouring process.

10. The method for constructing slow-bonding prestressed concrete based on beam haunch addition according to claim 8, characterized in that: The step S3 of installing the tensioning end prestressed tendon installation assembly (5) on the tensioning end side form (1) comprises: Installing a clip anchor (51) on the second side plate (12) of the tensioning end side form (1) close to the first side plate (11) to ensure that the clip anchor (51) is accurately positioned and aligned with the tensioning direction of the prestressed tendon (8); A first pressure-bearing plate (52) is installed on the side of the clip anchor (51) close to the middle side mold (2); A first spiral rib (53) is installed on a side of the first pressure-bearing plate (52) close to the middle side mold (2); The step S3 of installing the fixed end prestressed tendon installation assembly (6) on the fixed end side form (7) comprises: A second pressure plate (61) is installed on the side of the fixed end side mold (7) close to the middle side mold (2), and an extrusion anchor (63) is installed on the side away from the middle side mold (2), ensuring that their center lines are collinear and aligned; A second spiral rib (62) is installed on a side of the second pressure-bearing plate (61) away from the extrusion anchor (64); The process of fixing the two ends of the prestressed tendon (8) to the tensioning end prestressed tendon installation assembly (5) and the fixed end prestressed tendon installation assembly (6) in step S3 includes: Passing the tensioned end of the prestressed tendon through the first spiral tendon (53), the first pressure-bearing plate (52) and the clip anchor (51), ensuring that the tensioned end of the prestressed tendon (8) is fixed in the clip anchor (51); The fixed end of the prestressed tendon (8) is passed through the second spiral tendon (62) and the second pressure-bearing plate (61), and then fixed in the extrusion anchor (63).

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