Main truss telescopic beam

Abstract

The utility model discloses a main truss telescopic beam which comprises a bottom string beam, an outer beam and an inner beam which are sequentially sleeved from outside to inside, and further comprises an oil cylinder located on the inner side of the inner beam, the front end of a piston rod of the oil cylinder is fixedly connected with the bottom string beam, the front end of a cylinder body of the oil cylinder is fixedly connected with the outer beam, a pulley is arranged at the rear end of the cylinder body, and a transmission rope is wound on the pulley. A three-section structure composed of the bottom string beam, the outer beam and the inner beam is adopted, the stroke of the main truss is shared to the outer beam and the inner beam, the single-time walking stroke of the main truss can be met without the outer beam stretching out of the bottom string beam too long and the inner beam stretching out of the outer beam too long, friction force between telescopic beam bodies can be restrained easily, the main truss can walk smoothly, and meanwhile the service life of the main truss is prolonged. The joints of the two oil ways required by the oil cylinder are integrally arranged at the front end of the piston rod, and the joint part is communicated with the interior of the cylinder body through the first oil hole and the second oil hole formed in the piston rod, so that the oil cylinder has the characteristic of small occupied mounting space, and is particularly suitable for being mounted and used in a narrow space in a telescopic beam.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge construction engineering equipment technical field, concretely relates to a main truss telescopic beam. BACKGROUND

[0002] A bridge builder, also known as a bridge builder, is a mechanical device specially used for bridge construction. It can complete several links in the overall construction of the bridge, such as bridge pouring. The use of the bridge builder can greatly improve the efficiency and quality of bridge construction and reduce the investment of manpower and material resources.

[0003] The main truss is an important support structure of the bridge builder, and the bridge builder usually includes two groups of diamond frame type main trusses. The formwork is suspended in front of the main truss, and after pouring a section of box girder (the box girder is the existing bridge structure) through the formwork, the main truss needs to be adjusted to walk forward with the formwork, and the next section of the box girder is poured, and the pouring of the entire box girder is completed in this way.

[0004] The bottom of the main truss is usually provided with a telescopic beam, and the telescopic beam is provided with an oil cylinder. When the main truss needs to be adjusted to move forward, the oil cylinder drives the telescopic beam to extend so that the main truss moves forward.

[0005] The existing main truss telescopic beam is usually a two-section telescopic beam composed of the bottom chord beam of the main truss and the inner beam arranged in the bottom chord beam. During the walking process of the main truss, the length of the extension of the inner beam is the stroke of the main truss, which means that the inner beam needs to extend a long length to ensure the stroke of the main truss in a single walking. The formwork is suspended at the front end of the main truss, which will conduct a downward force to the front end of the bottom chord beam, so that the bottom chord beam has a tendency to be pressed down at the front end and lifted up at the rear end, thereby causing the contact friction between the inner wall of the bottom chord beam and the outer wall of the inner beam. When the inner beam extends beyond its center point, the friction between the inner beam and the bottom chord beam increases in a geometric multiple, and the walking resistance of the main truss becomes very large.

[0006] The oil cylinder in the telescopic beam is provided with a joint for connecting the oil pipe at the position close to both ends of the cylinder body (the joint is arranged along the radial direction of the cylinder body and protrudes from the cylinder body), and the joint communicates with the inside of the cylinder body through the oil hole (coaxially arranged with the joint) on the cylinder body. The traditional oil cylinder provided with the joint at both ends of the cylinder body occupies a lot of space and cannot be well adapted to the installation and use in the small space of the telescopic beam. UTILITY MODEL CONTENTS

[0007] The utility model aims at providing a main truss telescopic beam.

[0008] In order to achieve the above utility model purposes, the utility model adopts the following technical scheme:

[0009] A main truss telescopic beam, comprising a bottom chord beam, an outer beam and an inner beam which are sequentially sleeved from outside to inside, further comprising a cylinder located at the inner side of the inner beam, a front end of a piston rod of the cylinder is fixedly connected with the bottom chord beam, a front end of a cylinder body of the cylinder is fixedly connected with the outer beam, a pulley is arranged at a rear end of the cylinder body, a transmission cable is wound around the pulley, and two ends of the transmission cable are fixedly connected with the front end of the bottom chord beam and the front end of the inner beam respectively.

[0010] The piston rod is provided with a joint part for connecting an oil pipe near the front end, and the joint part is in communication with the inside of the cylinder body through a first oil hole and a second oil hole formed in the piston rod.

[0011] As a further improved technical scheme of the present application, the first oil hole and the second oil hole are respectively in communication with the spaces on both sides of the piston inside the cylinder body.

[0012] As a further improved technical scheme of the present application, the outer beam is provided with a first roller matched with the inner wall of the bottom chord beam.

[0013] As a further improved technical scheme of the present application, the inner beam is provided with a second roller matched with the inner wall of the outer beam.

[0014] As a further improved technical scheme of the present application, the joint part is connected with an electromagnetic valve.

[0015] As a further improved technical scheme of the present application, the front end of the piston rod is fixedly connected with the bottom chord beam through a positioning pin.

[0016] Compared with the prior art, the technical effect of the present application lies in:

[0017] The three-section structure composed of the bottom chord beam, the outer beam and the inner beam is adopted, the stroke of the main truss is distributed to the outer beam and the inner beam, the outer beam does not need to be excessively long outside the bottom chord beam, the inner beam does not need to be excessively long outside the outer beam, and the single walking stroke of the main truss can be met, which is beneficial to inhibit the friction between the beam bodies of the telescopic beam, makes the main truss walk smoothly, meanwhile, the joints of the two oil paths required by the cylinder are integrally arranged at the front end of the piston rod, and the joint part and the inside of the cylinder body are communicated through the first oil hole and the second oil hole arranged in the piston rod, which has the characteristics of small occupied installation space, and is especially suitable for installation and use in a narrow space in the telescopic beam. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a perspective structural schematic view of a main truss telescopic beam in the embodiment of the present application;

[0019] Figure 2 is a sectional structural schematic view of a main truss telescopic beam in the embodiment of the present application;

[0020] Figure 3 isFigure 2 Local enlarged structure schematic view at E;

[0021] Figure 4 is an explosion structure schematic view of a main truss telescopic beam in the embodiment of the utility model. DETAILED DESCRIPTION

[0022] The utility model will be described in detail below in combination with the specific embodiments shown in the drawings. However, these embodiments do not limit the utility model, and the changes in structure, method or function made by those skilled in the art based on these embodiments are all included in the protection scope of the utility model.

[0023] Please see Figures 1 to 4 A main truss telescopic beam, comprising bottom chord beams 201, outer beams 202 and inner beams 203 which are sequentially sleeved from outside to inside, further comprising an oil cylinder 6 located at the inner side of the inner beam 203, the front end of the piston rod 61 of the oil cylinder 6 is connected and fixed with the bottom chord beam 201, the front end of the cylinder body 62 of the oil cylinder 6 is connected and fixed with the outer beam 202, the rear end of the cylinder body 62 is provided with a pulley 7, a transmission cable 8 is wound on the pulley 7, and the two ends of the transmission cable 8 are respectively fixedly connected with the front end of the bottom chord beam 201 and the front end of the inner beam 203.

[0024] It should be noted that the outer beam 202 is called with respect to the inner beam 203, and actually the outer beam 202 is located between the bottom chord beam 201 and the inner beam 203.

[0025] The front end of the piston rod 61 is fixed with the bottom chord beam 201 through a positioning pin (not shown), and the front end of the cylinder body 62 is fixed with the front end of the outer beam 202, so that when the oil cylinder 6 operates, the cylinder body 62 will drive the outer beam 202 to elongate or shorten.

[0026] When the cylinder body 62 moves backward, it will apply force to the transmission cable 8 through the pulley 7, and then the inner beam 203 will be pulled to elongate by the transmission cable 8.

[0027] After the main truss walking is completed, the inner beam 203 can be manually pushed back, or a group of pulleys and transmission cables are further arranged, so that the inner beam 203 can be automatically retracted under the driving of the oil cylinder 6. Specifically, the working principle of the pulley and the transmission cable for driving the automatic retraction of the inner beam 203 is similar to that of the pulley 7 and the transmission cable 8 for driving the elongation of the inner beam 203, and the difference lies in that the pulley for driving the automatic retraction of the inner beam 203 is arranged at the front end of the cylinder body 62, and the two ends of the transmission cable are respectively fixedly connected with the rear end of the bottom chord beam 201 and the rear end of the inner beam 203. The utility model does not limit the retraction mode of the inner beam 203.

[0028] The joint part 611 is provided with a joint part 611 for connecting the oil pipe, and the joint part 611 is communicated with the inside of the cylinder body 62 through the first oil hole 63 and the second oil hole 64.

[0029] Specifically, the first oil hole 63 and the second oil hole 64 are respectively communicated with the spaces on both sides of the piston inside the cylinder body 62.

[0030] When the first oil hole 63 supplies oil to the cylinder body 62, the second oil hole 64 returns oil, and at this time, the cylinder body 62 is elongated; when the second oil hole 64 supplies oil to the cylinder body 62, the first oil hole 63 returns oil, and at this time, the cylinder body 62 is shortened.

[0031] It should be noted that the joint part 611 is block-shaped, and a plurality of oil paths are arranged in the joint part 611 as needed, and in actual application, not only the two joints of the oil cylinder 6 for driving the telescopic beam to run can be integrated on the joint part 611, but also the joints of other oil cylinders of the main truss can be integrated on the joint part 611.

[0032] In the embodiment, an electromagnetic valve (not shown, fixed on the top surface of the joint part 611 and communicated with the oil path of the joint part 611) is arranged on the joint part 611, and the electromagnetic valve is used for controlling the conduction or interruption of the oil path, and the joint part 611 is connected with the oil pipe through the electromagnetic valve.

[0033] In other embodiments, the oil pipe can be directly connected with the joint part 611, and the electromagnetic valve or other valve body is arranged outside the telescopic beam.

[0034] In the embodiment, the outer beam 202 is provided with a first roller 2021 matched with the inner wall of the bottom chord beam 201. The first roller 2021 is used to reduce the friction between the outer beam 202 and the bottom chord beam 201.

[0035] In the embodiment, the inner beam 203 is provided with a second roller 2031 matched with the inner wall of the outer beam 202. The second roller 2031 is used to reduce the friction between the inner beam 203 and the outer beam 202.

[0036] Compared with the prior art, the technical effect of the utility model lies in:

[0037] The utility model discloses a three-section structure of bottom chord beam 201, outer beam 202, inner beam 203, distribute the stroke of main truss to outer beam 202, inner beam 203, outer beam 202 does not need to stretch out bottom chord beam 201 too long, and inner beam 203 does not need to stretch out outer beam 202 too long, and the single walking stroke of main truss can be satisfied, is beneficial to the friction between telescopic beam beam body, makes the main truss walk smoothly, simultaneously, the joint of two oil circuits required by oil cylinder 6 is integrated and arranged at the front end of piston rod 61, and is communicated with joint part 611 and cylinder body 62 inside through the first oil hole 63, second oil hole 64 arranged in piston rod 61, has the characteristics of small installation space, is especially suitable for the installation use in the narrow space in telescopic beam.

[0038] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A main truss telescopic beam, characterized by, The beam comprises, from outside to inside, a bottom chord beam, an outer beam, an inner beam, and an oil cylinder located inside the inner beam, a front end of a piston rod of the oil cylinder is fixedly connected with the bottom chord beam, a front end of a cylinder body of the oil cylinder is fixedly connected with the outer beam, a rear end of the cylinder body is provided with a pulley, a transmission cable is wound around the pulley, and two ends of the transmission cable are fixedly connected with the front end of the bottom chord beam and the front end of the inner beam respectively. The front end of the piston rod is provided with a joint part for connecting an oil pipe, and the joint part is in communication with the inside of the cylinder body through a first oil hole and a second oil hole formed in the piston rod.

2. The main truss telescopic beam according to claim 1, characterized in that, The first oil hole and the second oil hole are respectively in communication with spaces on both sides of the piston inside the cylinder body.

3. The main truss telescopic beam according to claim 1, characterized in that, The outer beam is provided with a first roller matched with the inner wall of the bottom chord beam.

4. The main truss telescoping beam of claim 1, wherein, The inner beam is provided with a second roller matched with the inner wall of the outer beam.

5. The main truss telescoping beam of claim 1, wherein, The joint part is connected with an electromagnetic valve.

6. The main truss telescoping beam of claim 1, wherein, The front end of the piston rod is fixedly connected with the bottom chord beam through a positioning pin.

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