CN113689765B - Test arch abutment platform with adjustable span and test method thereof - Google Patents

Abstract

The invention discloses a test arch seat platform with adjustable span, which comprises two bases capable of relatively moving and an arch bridge structure positioned between the two bases, wherein an integrally formed protruding block is arranged at the end part of the arch bridge structure, a tight-fit structure capable of adjusting angles is embedded in the base, a concave block matched with the protruding block is fixed on the tight-fit structure, the protruding block is matched with the concave block to form a connecting block, a sleeve limiting piece sleeved on the connecting block is connected outside the arch bridge structure in a sliding manner, the sleeve limiting piece is clamped with a sleeve connecting structure on the base, and the sleeve limiting piece is fixed on the tight-fit structure. The sleeve limiting part sleeve which is connected with the arch bridge structure in an outward sliding manner is sleeved outside the connecting block, so that the bridge cannot slide downwards in the test process, the stability of the arch bridge structure and the base connection is guaranteed, the sleeve connecting structure on the base is matched with the sleeve limiting part in a clamping manner, and the sleeve limiting part is fixed on the tight-fit structure, so that the sleeve limiting part and the connecting block jointly bear a force transmission effect to guarantee the rigidity of the bridge.

Description

A test abutment platform with adjustable span and its test method

technical field

The invention relates to the technical field of bridge tests, in particular to a test abutment platform with adjustable span and a test method thereof.

Background technique

With the development of our country's national economic level, arch structures with beautiful structures and reasonable stresses are constantly emerging. Therefore, the stress characteristics of arch structures in the teaching of civil engineering are particularly important. However, the theoretical teaching of arch structures in "Structural Mechanics" is relatively difficult, and it is difficult for students to understand. In the context of increasing emphasis on practical education, the model test of arch structures has become one of the important contents of structural test teaching.

The arch structure has a beautiful arc, but because of this, many difficulties have been encountered in the design process of the arch structure experiment. How to load, how to test, how to meet the needs of multiple experiments in teaching, and how to combine the experiment with the theoretical teaching content are the key points. The problem that the device mainly solves.

In order to solve the above technical problems, the Chinese patent document (CN201909739U) discloses an arch structure test device, which includes three parts: an arch structure model, a loading device and a testing device. The reaction force beam in the device and the vertical screw work together to form a reaction force, and the reaction force directly acts on the arch structure to form a vertical pressure, which is accurately measured by a pressure sensor.

However, the arch structure in the above-mentioned scheme is fixed on the device, therefore, it can only be applied to an arch bridge structure with a span. In this way, the arch bridge structure cannot be reused, which increases unnecessary costs and wastes a lot of energy and time.

Contents of the invention

Aiming at the above-mentioned deficiencies in the prior art, the object of the present invention is to provide an adjustable-span test abutment platform and its test method that can quickly replace bridges with different spans and perform arch bridge structural model tests on it.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

A test abutment platform with adjustable span, comprising two relatively movable bases and an arch bridge structure between the two bases, the end of the arch bridge structure is provided with protrusions, and the inside of the base is Embedded with a tight fitting structure capable of adjusting the angle, the tight fitting structure is fixed with a concave block that can cooperate with the convex block, so that the convex block can be fixedly matched with the concave block to form a connecting block, and the two ends of the arch bridge structure Parts are slidably sleeved with sleeve stoppers, so that the connecting block formed by the fixed fit of the convex block and the concave block can be sleeved and limited by the sliding sleeve stopper to limit the loosening of the convex block and the concave block, and The tight fitting structure of the base is also provided with a sleeve connection structure for detachable connection with the sleeve limiter.

This scheme changes the distance between the two bases by moving the two bases, so as to facilitate the installation of arch bridge structures of different sizes, so as to adapt to the test of arch bridge structures of different sizes; The arching angle of the arch bridge structure prevents the end of the installed arch bridge structure from bending downwards; at the same time, the convex blocks at the end of the arch bridge structure and the concave blocks on the tight fitting structure can be fixedly matched to form a connecting block to ensure that the arch bridge structure and the base The connection; the sleeve limiter that uses the sliding connection outside the arch bridge structure is set on the outside of the connection block to prevent the bridge from sliding down during the test, ensuring the stability of the connection between the arch bridge structure and the base, and then matching the base The upper sleeve connection structure is connected with the sleeve limiter, and the two share the force transmission function to ensure its rigidity.

Further, the sleeve connection structure includes two symmetrically arranged push rods that are rotatably connected to the base, the lower surface of the end of the push rod far away from the base is an inclined surface, and the top of the sleeve limiter is provided with a slot , the push rod is inserted into the slot.

In this design, two symmetrically arranged ejector rods form a clamping state on the sleeve limiter, and the sleeve limiter is strengthened and fixed; during operation, the ejector rod is inserted into the slot of the sleeve limiter, The ejector rod is limited by the card slot to ensure that the ejector rod and the sleeve limiter are offset. Therefore, when the bridge is subjected to a pressure test, the cooperation between the ejector rod and the sleeve limiter can increase the radial support force of the bridge.

Further, the tight fit structure includes a cambered steel plate embedded in the base, and the cambered steel plate is connected with the adjusting steel plate of different thickness through the cooperation of the fixing screw and the fixing nut, and the upper surface of the adjusting steel plate is at a certain angle Inclined, the concave block is fixed on the adjusting steel plate.

In this design, the inclination angle of the entire tight-fitting structure can be adjusted by replacing the adjusting steel plates of different thicknesses, so that the tight-fitting structure can be closely attached to the end of the bridge, and then the arching surface steel plate and the adjusting steel plate are matched by the fixing screw and the fixing nut. A fixed connection between them can improve its stability.

Further, the base is fixed in the arch foot anchor seat, the arch foot anchor seat is placed on the floor concrete, and the arch foot anchor seat is connected with the floor concrete through the cooperation of the long screw and the first nut.

In this design, the base is protected by the anchoring seat of the arch foot, the anchoring seat of the arch foot and the concrete of the floor are passed through the long screw, and the upper and lower ends of the long screw are locked with the first nut, so that the anchoring seat of the arch foot and the concrete of the floor can be tightly Connection, to ensure that after the bridge is stressed, it is transmitted to the concrete of the bottom plate through the arch foot anchor seat, and the arch foot anchor seat bears the force transmission function.

Further, four steel strands are arranged between the two arch-foot anchoring seats, the steel strands run through the arch-foot anchoring seats, and the two ends of the steel strands are respectively anchored on the arch-foot anchoring seats.

Pass the steel strand rope through the two arch foot anchor seats, and then anchor the two ends of the steel strand rope on the arch foot anchor seats to lock its prestress, provide horizontal reaction force to the arch foot anchor seats, and share the long bolts Shear force ensures stability.

Further, jacking holes for lifting are respectively provided on both sides of the bottom of the arch foot anchoring seat, and lifting rings matching the jacking holes are provided on the arch foot anchoring seat.

With this design, after a test is completed, the arch foot anchor seat can be lifted with a jack at the jacking hole, and the arch foot anchor seat can be moved with the lifting ring and the laboratory crane to adapt to the arch bridge structure test of different spans.

A test method for a test abutment platform with an adjustable span, comprising the following steps:

Step 1: Before preparing for the test, obtain the structural size data of the test abutment platform, the structural size data includes the size data of the two bases, the arch bridge structure, the anchoring seats of the two arch feet, and the floor concrete;

Step 2: According to the test requirements, move the arch foot anchor seat to the test set position, and fix the arch foot anchor seat on the floor concrete through the cooperation of the long screw rod and the first nut;

Step 3: Adjust the inclination angle of the tight fitting structure on the base, so that the concave block on the tight fitting structure can cooperate with the convex block at the end of the arch bridge structure to form a connecting block, and push the sleeve limiter outside the arch bridge structure to be sleeved On the connection block, the sliding sleeve limiter sets the limit on the connection block formed by the fixed fit of the convex block and the concave block, so as to limit the loosening of the convex block and the concave block, and then connects through the sleeve on the tight fitting structure After the structure is connected with the sleeve limiter, the arch bridge structure test is carried out;

Step 4: After the test is completed, disassemble the connection between the sleeve connection structure and the sleeve stopper, move the sleeve stopper away from the connection block, and then move the concave block and the convex block in the connection block radially to disassemble. Separate the end of the arch bridge structure from the base. At the same time, disassemble the long screw and the first nut to separate the anchoring seat of the arch foot from the concrete of the bottom plate, and then carry out the next test by driving in the laboratory.

Further, in step 2, the two ends of the steel strand rope pass through two arch foot anchorage seats respectively, and the two ends of the steel strand rope are anchored on the arch foot anchorage seats, and the test loading process of the arch bridge structure is carried out by the steel strand rope The tension of the external prestress provides the horizontal force. Provide horizontal reaction force to the arch foot anchor seat, share the shear force of long bolts, and ensure stability.

Further, in step three, according to the test requirements, the adjusting steel plate prepared in advance is closely connected with the cambered steel plate through the cooperation of the fixing screw and the fixing nut.

Further, in Step 3, the rotatable ejector rod in the sleeve connection structure engages with the slot on the sleeve limiting member, so that the ejector rod and the sleeve limiting member are fixed against each other.

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

1. During the test, the present invention can quickly install and disassemble the base and the arch bridge structure through the detachable connection between the concave block on the base and the convex block on the arch bridge structure, and replace the arch bridge structure of different sizes to carry out different tests. In order to ensure the rigidity of the connection between the arch bridge structure and the base, the sleeve stopper that can slide along the arch bridge structure is sleeved on the connection block formed by the cooperation of the concave block and the convex block, so that the connection between the concave block and the convex block can be locked. connection, and then use the sleeve connection structure on the base to lock the sleeve limiter, thereby ensuring the overall rigidity. Therefore, the overall effect of quickly replacing the arch bridge structure can be achieved; at the same time, the arch foot anchor seat is used to drive the base along the Move in the length direction to adjust the distance between the anchoring seats of the two arch feet to adapt to arch bridge structures with different spans and to conduct tests on different arch bridge structures.

2. The present invention adjusts the angle of the lower bottom surface of the anchoring section of the arch foot so that it closely fits with the top surface of the steel plate on the arching surface, which is beneficial to adjust the inclination angle of the arching; the steel plate on the arching surface and the force transmission bracket are welded and embedded in the reinforced concrete base It is conducive to the transmission of force; the four ground anchor bolts are closely connected with the laboratory floor through a tight fit structure, which is conducive to the uniform force of the ground anchor bolts.

3. When the arch bridge structure of the present invention is stressed, a large horizontal thrust is generated through the steel strands on the arch foot anchorage seat. The traditional method is to fix the arch foot anchorage seat on the floor concrete to resist the horizontal thrust. This test platform The long screw and the steel strand are used to jointly bear the horizontal thrust. At the same time, the distance of the anchoring seat of the arch foot can be controlled and adjusted according to actual needs, which enhances safety, practicability, and reduces test costs. It is in line with the principles of economy, environmental protection, and applicability.

Description of drawings

Fig. 1 is a structural schematic diagram of the adjustable span test abutment platform of the present invention.

FIG. 2 is a partially enlarged view of A1 in FIG. 1 .

Fig. 3 is a structural schematic diagram of the close-fitting structure in the adjustable-span test abutment platform of the present invention.

In the figure: base 1, arch bridge structure 2, tight fitting structure 3, convex block 4, concave block 5, sleeve limiter 6, ejector rod 7, arch foot anchor seat 8, lifting ring 9, long screw rod 10, jacking Hole 11, steel strand rope 12, arching surface steel plate 13, adjusting steel plate 14, bottom plate concrete 15.

Detailed ways

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

This embodiment: see Fig. 1 to Fig. 3, an adjustable span test abutment platform, including two relatively movable bases 1 and an arch bridge structure 2 between the two bases 1, the arch bridge structure 2 An integrally formed bump 4 is provided at the end of the base 1, and a tightly fitting structure 3 capable of adjusting the angle is embedded in the base 1, and a concave block 5 that can cooperate with the bump 4 is fixed on the tight fitting structure 3, so that the convex The block 4 can be fixedly matched with the concave block 5 to form a connection block, and the two ends of the arch bridge structure 2 are respectively slidably sleeved with a sleeve limiter 6, so that the convex block 4 and the concave block can be aligned by sliding the sleeve limiter 6. 5. The connection block formed by fixed fit is sleeved and limited to limit the loosening of the convex block 4 and the concave block 5, and the tight fitting structure 3 of the base 1 is also provided with a detachable connection with the sleeve limiter 6. Sleeve connection structure.

This program changes the distance between the two bases 1 by moving the two bases 1, so as to facilitate the installation of arch bridge structures 2 of different sizes, so as to adapt to the test of arch bridge structures 2 of different sizes; use the adjustable angle on the base 1 The tightly fitting structure 3 adjusts the arch inclination angle of the arch bridge structure 2 to prevent the end of the installed arch bridge structure 2 from bending downward; at the same time, a through hole runs through the concave block 5, and the inner wall of the through hole is inclined inwardly on both sides. During installation, the protruding block 4 at the end of the arch bridge structure 2 moves radially, so that the protruding block 4 is inserted into the concave block 5 on the tightly fitting structure 3, and the two are fixedly matched to form a connecting block, so as to ensure that the arch bridge structure 2 will not move horizontally; The sleeve limiter 6 that is slidingly connected outside the arch bridge structure 2 is set on the outside of the connection block so that the arch bridge structure 2 will not slide downward during the test, ensuring the stability of the connection between the arch bridge structure 2 and the base 1, and then The sleeve connection structure on the matching base 1 is connected with the sleeve limiter 6, or the sleeve limiter rod 6 can also be fixed on the base 1 through a bolt connection, so that the two share the force transmission effect to ensure its rigidity.

Preferably, the sleeve connection structure includes two symmetrically arranged push rods 7 that are rotatably connected to the base 1. The lower surface of the end of the push rod 7 away from the base 1 is an inclined surface, and the top of the sleeve limiter 6 is provided with a card slot. , the push rod 7 is inserted into the slot.

In this design, two symmetrically arranged push rods 7 form a clamping state on the sleeve limiter 6, and the sleeve limiter 6 is strengthened and fixed; during operation, insert the sleeve limiter 6 through the push rod 7 In the draw-in slot, the ejector rod 7 is limited by the draw-in slot to ensure that the ejector rod 7 and the sleeve limiter 6 are offset. Therefore, when the bridge is tested for pressure, the ejector rod 7 and the sleeve limiter 6 can cooperate Improve the radial support of the bridge.

Preferably, the tightly fitting structure 3 includes a cambered steel plate 13 embedded in the base 1, and the cambered steel plate 13 is connected with the adjusting steel plate 14 of different thickness through the cooperation of the fixing screw and the fixing nut, and the upper surface of the adjusting steel plate 14 It is inclined at a certain angle, and the concave block 5 is fixed on the adjusting steel plate 14 .

In such a design, the inclination angle of the entire tight fitting structure 3 is adjusted by replacing the adjusting steel plates 14 of different thicknesses, so that the tight fitting structure 3 can be closely attached to the end of the bridge, and then the arched steel plate can be fixed by the cooperation of the fixing screw and the fixing nut. 13 is fixedly connected with the adjustment steel plate 14, which can improve its stability.

Preferably, the base 1 is fixed in the arch foot anchor seat 8, the arch foot anchor seat 8 is placed on the floor concrete 15, and the arch foot anchor seat 8 is connected to the floor concrete 15 through the cooperation of the long screw 10 and the first nut.

Designed in this way, the base 1 is protected by the arch foot anchor seat 8, the arch foot anchor seat 8 and the floor concrete 15 are passed through the long screw rod 10, and the upper and lower ends of the long screw rod 10 are locked with the first nut, so that the arch foot is anchored Seat 8 and floor concrete 15 can be closely connected to ensure that after the bridge is stressed, it is transmitted to floor concrete 15 through arch foot anchor seat 8, and its arch foot anchor seat 8 bears the force transmission function.

Preferably, four steel strands 12 are arranged between the two arch-foot anchoring seats 8 , the steel strands 12 run through the two arch-foot anchoring seats 8 , and the two ends of the steel strands 12 are respectively anchored on the arch-foot anchoring seats 8 .

Pass the steel strand rope 12 through the two arch foot anchor seats 8, and by anchoring the two ends of the steel strand rope 12 on the arch foot anchor seats 8, the prestress is locked to provide horizontal reaction force to the arch foot anchor seats 8, Share the shear force of long bolts to ensure stability.

As a preference, jacking holes 11 for lifting are respectively provided on both sides of the bottom of the arch foot anchoring seat 8 , and lifting rings 9 matched with the jacking holes 11 are provided on the arch foot anchoring seat 8 .

With this design, after a test is completed, the arch foot anchor seat 8 can be lifted by a jack at the jacking hole 11, and the arch foot anchor seat 8 can be moved in cooperation with the lifting ring 9 and the driving in the laboratory to adapt to arch bridges with different spans. Structure 2 test.

A test method for a test abutment platform with an adjustable span, comprising the following steps:

Step 1: Before preparing for the test, obtain the structural size data of the test abutment platform, the structural size data includes the size data of the two bases 1, the arch bridge structure 2, the two arch foot anchors 8, and the floor concrete 15;

Step 2: According to the test requirements, the arch foot anchor seat 8 is moved to the designated position, and the arch foot anchor seat 8 is fixed on the bottom plate concrete 15 through the cooperation of the long screw rod 10 and the first nut;

Step 3: Adjust the inclination angle of the tight fitting structure 3 on the base 1, so that the concave block 5 on the tight fitting structure 3 can cooperate with the convex block 4 at the end of the arch bridge structure 2 to form a connecting block, and push the outside of the arch bridge structure 2 The sleeve limiter 6 is sleeved on the connection block, and the connection block formed by the fixed cooperation of the convex block 4 and the concave block 5 is set and limited by the sliding sleeve limiter 6 to limit the convex block 4 and the concave block. 5 is loosened, and after connecting the sleeve connection structure on the tight fit structure 3 with the sleeve limiter 6, the test of the arch bridge structure 2 is carried out;

Step 4: After the test is completed, disassemble the connection between the sleeve connection structure and the sleeve stopper 6, move the sleeve stopper 6 away from the connection block, and then connect the concave block 5 and the convex block 4 in the connection block Move and disassemble in the direction so that the end of the arch bridge structure 2 is separated from the base 1. At the same time, disassemble the long screw 10 and the first nut to separate the anchoring seat 8 of the arch foot from the concrete 15 of the bottom plate, and then carry out the next test by driving in the laboratory .

As preferably, in step 2, the two ends of steel strand rope 12 pass through two arch foot anchorage seats respectively, and the two ends of steel strand rope 12 are anchored on arch foot anchorage seat 8, in the test loading process of arch bridge structure 2 The horizontal force is provided by tensioning of the externally prestressed strands 12 . Provide horizontal reaction force to the arch foot anchor seat 8, share the shear force of the long bolts, and ensure stability.

Preferably, in step three, according to the test requirements, the adjusting steel plate 14 prepared in advance is tightly connected to the cambered steel plate 13 through the cooperation of the fixing screw and the fixing nut.

Preferably, in Step 3, the rotatable push rod 7 in the sleeve connection structure engages with the slot on the sleeve stopper 6, so that the push rod 7 and the sleeve stopper 6 are fixed against each other.

Through the overall finite element calculation of the model test abutment structure, and the manual calculation of the local pressure bearing and anti-overturning stability, the following conclusions are obtained:

1) Under the load conditions of 250t horizontal force and 250t vertical force, the maximum horizontal displacement of the structure is 0.22mm; micro-cracks appear at the edge of the slope of the arch foot and at the vertical and horizontal thrust direction of the bottom anchor hole, and the stress of the steel bar at the crack position is not large ; The rest of the structural stress is small to meet the requirements.

2) Under the load conditions of 250t horizontal force and 250t vertical force, and only considering the force of one row of anchor rods, the maximum horizontal displacement of the structure is 0.63mm; there are through cracks in the vertical and horizontal thrust directions at the anchor holes at the bottom, and cracks at the cracks The maximum stress of steel bars is 109MPa; the stress of other structures is small enough to meet the requirements.

3) Under extreme working conditions, the maximum horizontal displacement of the structure is 0.88mm; the load at this time is 917.5t horizontal force and 917.5t vertical force, the maximum stress of the steel bar is 318MPa, the maximum stress of the M70 steel screw is 214MPa, and the maximum stress of the positioning bracket is 42MPa ; Cracks appeared at the edge of the slope of the arch foot, the action position of the arch foot and the vertical and horizontal thrust of the anchor hole at the bottom.

4) The maximum horizontal force of a single screw on the side abutment of the reaction wall is 65.7t, which occurs at the position of the middle two anchors under the condition of only one row of anchors. The shear strength check of a single bolt can meet the requirements, and its safety factor is 3.4 .

5) The local pressure bearing of the abutment can meet the requirements of the code, among which the local pressure safety factor of the embedded parts of the tower is 23.9, the local pressure safety factor of the embedded parts of the arch foot is 17.5, and the local pressure safety factor of the jacking hole is 7.4.

The overall overturning stability of the abutment can meet the specification requirements, and its anti-overturning stability coefficient is 1.8.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than limit the technical solutions. Those of ordinary skill in the art should understand that those who modify or replace the technical solutions of the present invention without departing from the present technology The purpose and scope of the scheme should be included in the scope of the claims of the present invention.

Claims (8)

1. The experimental arch seat platform with the adjustable span is characterized by comprising two bases (1) capable of relatively moving and an arch bridge structure (2) positioned between the two bases (1), wherein a lug (4) is arranged at the end part of the arch bridge structure (2), a tight-fit structure (3) capable of adjusting an angle is embedded in the base (1), a concave block (5) capable of being matched with the lug (4) is fixed on the tight-fit structure (3), the lug (4) can be fixedly matched with the concave block (5) to form a connecting block, sleeve limiting pieces (6) are respectively sleeved at two ends of the arch bridge structure (2) in a sliding mode, the connecting block formed by the fixed matching of the lug (4) and the concave block (5) can be sleeved with a limiting piece through the sliding sleeve limiting pieces (6) to limit the loosening of the lug (4) and the concave block (5), and a sleeve connecting structure used for being detachably connected with the sleeve limiting pieces (6) is further arranged on the tight-fit structure (3) of the base (1);

the sleeve connecting structure comprises two ejector rods (7) which are symmetrically arranged and are rotationally connected with the base (1), the lower surface of the end part of the ejector rod (7) far away from the base (1) is an inclined surface, the top of the sleeve limiting part (6) is provided with a clamping groove, and the ejector rods (7) are inserted into the clamping groove;

the tight-fit structure (3) comprises an arch-forming steel plate (13) embedded in the base (1), the arch-forming steel plate (13) is connected with adjusting steel plates (14) with different thicknesses through the cooperation of a fixing screw and a fixing nut, the upper surface of the adjusting steel plate (14) is inclined at a certain angle, and the concave block (5) is fixed on the adjusting steel plate (14).

2. A test abutment platform with adjustable span according to claim 1, characterized in that the base (1) is fixed in an abutment anchor (8), the abutment anchor (8) being placed on the floor concrete (15), the abutment anchor (8) being connected to the floor concrete (15) by means of the cooperation of the long screw (10) and the first nut.

3. A test abutment platform with adjustable span according to claim 2, characterized in that four steel strands (12) are arranged between two abutment (8), said steel strands (12) extend through two abutment (8), and two ends of said steel strands (12) are anchored to the abutment (8) respectively.

4. The span-adjustable test arch abutment platform according to claim 2, wherein jacking holes (11) for jacking are respectively formed in two sides of the bottom of the arch abutment anchor (8), and a hanging ring (9) matched with the jacking holes (11) is arranged on the arch abutment anchor (8).

5. A method of testing an adjustable span test abutment platform according to any one of claims 1 to 4, comprising the steps of:

step one: before preparing a test, acquiring structural dimension data of a test arch abutment platform, wherein the structural dimension data comprise dimension data of two bases (1), an arch bridge structure (2), two arch abutment anchoring seats (8) and a bottom plate concrete (15);

step two: according to the test requirement, the arch springing anchoring base (8) is moved to a test set position, and the arch springing anchoring base (8) is fixed on the bottom plate concrete (15) through the cooperation of the long screw (10) and the first nut;

step three: the inclination angle of a close-fitting structure (3) on a base (1) is adjusted, so that a concave block (5) on the close-fitting structure (3) can be fixedly matched with a convex block (4) at the end part of an arch bridge structure (2) to form a connecting block, a sleeve limiting piece (6) outside the arch bridge structure (2) is pushed to be sleeved on the connecting block, and the connecting block formed by fixedly matched convex block (4) and concave block (5) is sleeved and limited by a sliding sleeve limiting piece (6) so as to limit the loose of the convex block (4) and the concave block (5), and after the sleeve connecting structure on the close-fitting structure (3) is connected with the sleeve limiting piece (6), the arch bridge structure (2) is tested;

step four: after the test is completed, the sleeve connecting structure and the sleeve limiting part (6) are disassembled, the sleeve limiting part (6) is moved away from the connecting block, the concave block (5) in the connecting block and the convex block (4) are moved and split in the radial direction, the end part of the arch bridge structure (2) is separated from the base (1), meanwhile, the long screw (10) and the first nut are disassembled to separate the arch foot anchoring seat (8) from the bottom plate concrete (15), and the next test is performed by lifting through a laboratory crane.

6. The method according to claim 5, wherein in the second step, both ends of the steel strand (12) pass through the two arch springing anchors, and both ends of the steel strand (12) are anchored to the arch springing anchors (8), and the horizontal force is provided by tensioning the steel strand (12) by external prestress during the test loading of the arch bridge structure (2).

7. A testing method of an adjustable span test abutment platform according to claim 5, characterized in that in step three, according to the test requirements, an adjusting steel plate (14) prepared in advance is tightly connected with the arching steel plate (13) through the cooperation of a fixing screw and a fixing nut.

8. The method according to claim 5, wherein in the third step, the rotatable ejector rod (7) in the sleeve connection structure is clamped with a clamping groove on the sleeve limiting piece (6), so that the ejector rod (7) is abutted and fixed with the sleeve limiting piece (6).

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