Construction method for balance weight of unbalanced beam section of continuous beam

Abstract

The invention provides a construction method for balance weight of an unbalanced beam section of a continuous beam, and belongs to the field of building construction. According to the technical scheme, the construction method comprises the following steps that S1, firstly, balance weight construction is conducted on an unbalanced beam section of the continuous beam, and balance weight loading is conducted on a small-span beam section on one side of a main pier through a balance weight vehicle; and S2, concrete pouring construction is conducted on the beam section on the other side of the main pier, and the loading vehicle is moved on the main beam at a constant speed in the pouring process according to the concrete pouring amount. The method has the beneficial effects that in the construction working condition that the two ends of the continuous beam cantilever are asymmetric, balance of bending moments at the two ends is guaranteed through dead load movement, and therefore the problem of unbalanced continuous beam construction balance weight is solved, and the safety risk and the tedious operation process existing in a traditional unbalanced continuous beam balance weight mode are solved.

Description

Technical Field

[0001] The invention relates to the field of building construction, and in particular to a construction method for balancing counterweights of unbalanced beam sections of continuous beams. Background Art

[0002] When constructing unbalanced beam sections, it is necessary to carry out counterweighting on the side of the beam section with small span and light weight. There are various methods for counterweighting construction, generally using precast concrete blocks, water tanks, steel bars, counterpressure, etc. The traditional counterweighting method consumes a lot of manpower, material resources and financial resources, and is restricted by different construction conditions. As the construction load changes continuously, it is difficult to implement and the process is complicated. It is easy to cause beam body unbalanced loading and cracks, which affects the linear control of the continuous beam and also poses a safety hazard to construction. Summary of the invention

[0003] The purpose of the present invention is to provide a construction method for balancing the weight of an unbalanced beam section of a continuous beam by utilizing constant load movement to ensure the balance of the bending moments at both ends in an asymmetric construction condition at both ends of a continuous beam cantilever, thereby solving the problem of counterweighting in the construction of an unbalanced continuous beam, and solving the safety risks and complicated operation process of the traditional counterweighting method of an unbalanced continuous beam.

[0004] The present invention is achieved by the following measures: A construction method for balancing the weight of an unbalanced beam section of a continuous beam, characterized in that the construction method comprises the following steps: S1. First, counterweight construction is carried out on the unbalanced beam section of the continuous beam, and a counterweight vehicle is used to load the small span beam section on one side of the main pier; S2. Concrete pouring construction is carried out on the cast-in-place section on the other side of the main pier. During the pouring process, the loading vehicle is moved at a uniform speed on the main beam according to the pouring amount of concrete.

[0005] The specific features of the present invention also include: The moving speed of the counterweight vehicle in step S2 The calculation formula is

[0006] (m / s) in, It is the change in the distance between the front of the loading vehicle and the center of the main pier during the pouring process; The theoretical pouring time of concrete.

[0007] Obtained through the following calculation formula:

[0008] in, It is the change in the distance between the head of the counterweight vehicle and the center of the main pier during the pouring process; is the change in gravity of poured concrete; The distance between the center of the main pier and the center of the cast-in-place section; = , is the total weight of the counterweight vehicle.

[0009] Obtained through the following calculation formula:

[0010]

[0011] in, is the total weight of the counterweight vehicle; is the empty mass of the counterweight truck; The mass of the counterweight is; The added mass of the cast-in-place section after pouring is completed; It is the added gravity of the cast-in-place section after pouring is completed; The distance between the center of the cast-in-place section and the center of the main pier; The distance between the head of the counterweight vehicle and the center of the main pier is ; The total length of the suspended section is; is the length of the counterweight vehicle body; The counterweight vehicle is moved to a safe distance of 3m from the tail end of the suspended section.

[0012] Among them, the quality of the cast-in-place section formwork is , gravity is , the total mass after pouring is , gravity is , .

[0013] A reflective plate is arranged in the center of the main pier to facilitate laser ranging, and laser ranging devices are installed at both ends of the counterweight vehicle.

[0014] During construction: Step 1: First, calculate and prepare the counterweight blocks that meet the requirements according to the above formula and the amount of concrete to be poured, and calculate the travel speed of the counterweight vehicle; Step 2: Lift the loading vehicle to the small span beam section on one side of the main pier and place the counterweight on the loading vehicle. Adjust the relative position between the laser rangefinder on the front of the vehicle and the reflector so that the instrument can normally feedback data and verify it. Step 3: During pouring, the counterweight truck operator moves the counterweight truck at a constant speed according to the calculated speed V during the concrete pouring process, while observing the feedback data from the laser rangefinder in real time , check with the theoretical value until the pouring is completed.

[0015] The beneficial effects of the present invention are as follows: in the asymmetric construction conditions at both ends of the cantilever of the continuous beam of the present invention, the constant load movement is used to ensure the balance of the bending moments at both ends, thereby solving the problem of counterweighting in the construction of unbalanced continuous beams, and solving the safety risks and relatively cumbersome operation process of the traditional counterweighting method of unbalanced continuous beams. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of the present invention.

[0017] Among them, the figure markings are: 1. cast-in-place section; 2. reflector; 3. counterweight vehicle; 4. small-span beam section; 5. main pier. DETAILED DESCRIPTION

[0018] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0019] See also Figure 1 A construction method for balancing the weight of an unbalanced beam section of a continuous beam, the construction method comprising the following steps: S1. First, counterweight construction is performed on the unbalanced beam section of the continuous beam, and a counterweight vehicle 3 is used to load the small span beam section 4 on one side of the main pier 5 with counterweight; S2. Concrete pouring construction is carried out on the cast-in-place section 1 on the other side of the main pier 5. During the pouring process, the loading vehicle is moved at a uniform speed on the main beam according to the pouring amount of concrete.

[0020] The moving speed of the counterweight vehicle 3 in step S2 The calculation formula is

[0021] (m / s) in, It is the change in the distance between the front of the loading vehicle and the center of the main pier during the pouring process; The theoretical pouring time of concrete.

[0022] Obtained through the following calculation formula:

[0023] in, It is the change in the distance between the head of the counterweight vehicle and the center of the main pier during the pouring process; is the change in gravity of poured concrete; The distance between the center of the main pier and the center of the cast-in-place section; = , is the total weight of the counterweight vehicle.

[0024] Obtained through the following calculation formula:

[0025]

[0026] in, is the total weight of the counterweight vehicle; is the empty mass of the counterweight truck; The mass of the counterweight is; The added mass of the cast-in-place section after pouring is completed; It is the added gravity of the cast-in-place section after pouring is completed; The distance between the center of the cast-in-place section and the center of the main pier; The distance between the head of the counterweight vehicle and the center of the main pier is ; The total length of the suspended section is; is the length of the counterweight vehicle body; The counterweight vehicle is moved to a safe distance of 3m from the tail end of the suspended section.

[0027] Among them, the mass of the formwork for cast-in-place section 1 is , gravity is , the total mass after pouring is , gravity is , .

[0028] A reflector 2 is arranged at the center of the main pier to facilitate laser ranging, and laser ranging devices are provided at both ends of the counterweight vehicle 3.

[0029] During construction: Step 1: First, calculate and prepare the counterweight blocks that meet the requirements according to the above formula and the amount of concrete to be poured, and calculate the travel speed of the counterweight vehicle 3; Step 2: Lift the loading vehicle to the small span beam section on one side of the main pier and place the counterweight on the loading vehicle. Adjust the relative position between the laser rangefinder on the front of the vehicle and the reflector so that the instrument can normally feedback data and verify it. Step 3: During pouring, the operator of the counterweight vehicle 3 moves the counterweight vehicle 3 at a constant speed according to the calculated speed V during the concrete pouring process, and observes the feedback data of the laser rangefinder in real time , check with the theoretical value until the pouring is completed.

[0030] Technical features not described in the present invention can be achieved through or by adopting existing technologies and will not be described in detail here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A construction method for balancing the weight of an unbalanced beam section of a continuous beam, characterized in that: The construction method comprises the following steps: S1. First, counterweight construction is carried out on the unbalanced beam section of the continuous beam, and a counterweight vehicle is used to load the small span beam section on one side of the main pier; S2. Concrete pouring construction is carried out on the cast-in-place section on the other side of the main pier. During the pouring process, the loading vehicle is moved at a uniform speed on the main beam according to the pouring amount of concrete.

2. The construction method of the unbalanced beam section of the continuous beam with balanced counterweight according to claim 1 is characterized in that: The moving speed of the counterweight vehicle in step S2 The calculation formula is (m / s) in, It is the change in the distance between the front of the loading vehicle and the center of the main pier during the pouring process; The theoretical pouring time of concrete.

3. The construction method of the unbalanced beam section of the continuous beam with balanced counterweight according to claim 2 is characterized in that: In claim 2 Obtained through the following calculation formula: in, It is the change in the distance between the head of the counterweight vehicle and the center of the main pier during the pouring process; is the change in gravity of poured concrete; The distance between the center of the main pier and the center of the cast-in-place section; = , is the total weight of the counterweight vehicle.

4. The construction method of the unbalanced beam section of the continuous beam with balanced counterweight according to claim 3 is characterized in that: In claim 3 Obtained through the following calculation formula: in, is the total weight of the counterweight vehicle; is the empty mass of the counterweight truck; The mass of the counterweight is; The added mass of the cast-in-place section after pouring is completed; It is the added gravity of the cast-in-place section after pouring is completed; The distance between the center of the cast-in-place section and the center of the main pier; The total length of the suspended section is; is the length of the counterweight vehicle body; The counterweight vehicle is moved to a safe distance of 3m from the tail end of the suspended section.

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