Bridge girder support method

Abstract

To provide a heavy load support device capable of supporting a heavy object while measuring the load acting on itself, and a heavy load support method using the same to thereby solve problems of the prior arts.SOLUTION: A disclosed heavy load support device is a device for supporting a heavy object, which includes a loading plate and measurement means. The measurement means is placed between two loading plates placed above and below and fixed to the loading plates. The measurement means is capable of measuring the load applied in a direction approximately perpendicular to the loading plate (including the vertical direction). The disclosed heavy load support device is capable of supporting heavy objects with a load not exceeding the maximum measurement load acting on the measurement means.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to technology for supporting heavy objects such as bridge girders, and more specifically, to a heavy object support device that can support a heavy object while measuring the load acting on it, and a method for supporting a heavy object using the same. [Background technology]

[0002] Bridge construction work is broadly divided into substructure work, such as abutments and piers, and superstructure work, which mainly involves constructing the deck, with the superstructure work being carried out after the substructure work is completed. The general construction procedure for the superstructure is to first erect the bridge girders, then build the deck and bridge accessories, then carry out paving work, and then install facilities such as signs and lighting.

[0003] There are various known methods for erecting bridge girders. For example, in the case of steel bridges, the bent method, the launching method, the cantilever erection method, and the like are used. Of these, the bent method is the most common method, and compared to other methods, it can reduce the amount of temporary equipment and can be erected in a short construction period. As disclosed in Patent Document 1 (particularly the bridge erection method of the second embodiment), the specific procedure for the bent method is to first install bents as temporary equipment between the support structures (abutments and piers). Then, using a lifting machine, the divided bridge girders are arranged so that they are spanned over the support structures and bents. Once all the bridge girders are in place, they are connected to each other, and finally the bents are removed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-47962 A Summary of the Invention [Problem to be solved by the invention]

[0005] Usually, a support bracket is used to place the bridge girder on the bent. Specifically, two or more tiers of support brackets (sometimes only one tier) are placed on top of the bent, and the bridge girder is placed on top of them. In order to ensure that the load of the bridge girder acts evenly on the support brackets, the bridge girder is first supported by jacks, and then the jacks are gradually lowered to lower the bridge girder onto the support brackets.

[0006] Incidentally, the load acting on the receiving metal fittings due to the load of the bridge girder (i.e., the design load) can be known in advance by performing design calculations. In this case, it is a good idea to measure the load acting on the receiving metal fittings while actually carrying out construction. For example, if the measured load is likely to exceed the design load, measures can be taken such as temporarily lifting the bridge girder with a jack or the like and then adjusting the position of the receiving metal fittings, which makes it possible to carry out construction while preventing accidents from occurring.

[0007] However, with conventional construction methods, it was not possible to check the measured load against the design load while carrying out construction as described above. While the measured load can be grasped from the jack load when the bridge girder is supported by a jack, it is not possible to measure the load acting on the bridge girder after it is placed on the bridge support.

[0008] The object of the present invention is to solve the problems associated with the conventional technology, namely, to provide a weight support device capable of supporting a weight object while measuring the load acting on the device itself, and a weight support method using the same. [Means for solving the problem]

[0009] The present invention was made with a focus on the fact that by combining a load meter such as a load cell (especially a compression type load meter) with a loading plate, it is possible to support a heavy object while measuring the load, and is an invention based on an unprecedented idea.

[0010] The weight support device of the present invention is a device for supporting a weight, and includes a loading plate and a measuring means. The measuring means is disposed between two loading plates disposed above and below, and fixed to each of the loading plates. The measuring means is capable of measuring a load in a direction substantially perpendicular (including perpendicular) to the loading plate. The weight support device of the present invention can support a weight on which a load equal to or less than the maximum measurable load of the measuring means acts.

[0011] The weight support device of the present invention can further include a metal fitting connecting means for supporting a "bridge girder" as a weight and connecting the metal fitting and the load plate. In this case, the metal fitting arranged below the bridge girder and the load plate arranged directly below the metal fitting can be connected by the metal fitting connecting means.

[0012] The weight support device of the present invention may be configured to be capable of measuring load even when either of the loading plates is positioned upward.

[0013] The weight support device of the present invention may have two or more measuring means disposed between the load plates. In this case, each measuring means is fixed to the load plate.

[0014] The method for supporting a heavy load of the present invention is a method for supporting a heavy load using the heavy load support device of the present invention, and includes a device arrangement step, a metal fitting installation step, and a heavy load installation step. In the device arrangement step, two or more heavy load support devices are arranged on substantially the same (including the same) plane, and in the metal fitting installation step, one metal fitting is placed on the upper surface of the two or more heavy load support devices and the metal fitting is connected to each of the heavy load support devices. In the heavy load installation step, a heavy load is placed on the upper surface of the metal fitting, and in the load measurement step, the load acting on the heavy load support device is measured.

[0015] The weight support method of the present invention may further include a load adjustment step, in which each weight support device is expanded or contracted depending on the measurement result in the load measurement step so that the measured load falls within an allowable range for the design load, or so that the load acts evenly on each weight support device. Effect of the Invention

[0016] The weight support device and the weight support method of the present invention have the following advantages. (1) The bridge girder can be erected while measuring the load acting on the weight support device. As a result, unforeseen circumstances such as exceeding the design load can be detected early, allowing prompt and appropriate measures to be taken. (2) Since the measuring means is fixed to the upper and lower loading plates, the weight can continue to be supported stably even if a horizontal load caused by the weight is applied. (3) By making the weight support devices extendable, the load can be applied evenly to each weight support device. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view showing a support structure installed in a vent. [Diagram 2] 1A is an enlarged perspective view of the support structure as viewed from above, and FIG. 1B is an enlarged perspective view of the support structure as viewed from the front. [Diagram 3] FIG. 2A is a side view of the weight support device of the present invention, and FIG. 2B is a plan view of the weight support device of the present invention, as viewed from above. [Figure 4] (a) is a side view showing a weight support device in which three measurement means are arranged between a pair of loading plates, and (b) is a plan view showing a weight support device in which three measurement means are arranged between a pair of loading plates. [Diagram 5] FIG. 2 is a plan view showing a pair of loading plates for a weight support device in which three measuring means are arranged between the pair of loading plates. [Figure 6] FIG. [Figure 7] FIG. 4 is a plan view showing brackets connected to weight support devices arranged in three rows. [Figure 8] 8A is a side view taken along the line AA in FIG. 7, and FIG. 8B is a side view taken along the line BB in FIG. [Figure 9] 1 is a flow chart showing the flow of main steps of a weight support method according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] An embodiment of the heavy load support device and the heavy load support method of the present invention will be described with reference to the drawings. Note that the present invention can be applied to various heavy loads for which it is desirable to perform support work while measuring the load, but for convenience, the heavy load will be described here as an example of a "bridge girder."

[0019] 1.Heavy object support equipment First, the weight support device of the present invention will be described. The weight support method of the present invention is a method for supporting a weight using the weight support device. Therefore, the weight support device of the present invention will be described first, and then the weight support method of the present invention will be described.

[0020] FIG. 1 is a perspective view showing a support structure 300 installed on a bent BT, FIG. 2(a) is an enlarged perspective view of the support structure 300 shown in FIG. 1 from above, and FIG. 2(b) is an enlarged perspective view of the support structure 300 shown in FIG. 2(a) from the front. As shown in FIG. 2, this support structure 300 is a structure consisting of a heavy load support device 100 and a receiving bracket 200 of the present invention, and can support a bridge girder after being installed on a bent BT or the like. As shown in FIG. 1, the support structure 300 can support a bridge girder by being installed above the bent BT, and can support the bent BT itself by being installed below the bent BT. Of course, the support structure 300 can support a bridge girder not only on a bent BT but also on other temporary structures such as shoring.

[0021] 3 is a diagram showing a heavy load support apparatus 100 of the present invention, where (a) is a side view seen from the side, and (b) is a plan view seen from above. For convenience, the directions (especially up and down) of the heavy load support apparatus 100 will be described here in the state when it is in use. As shown in FIG. 3, the heavy load support apparatus 100 of the present invention includes two loading plates 110 and a measuring means 120. The measuring means 120 is disposed between an upper loading plate 110U disposed above and a lower loading plate 110L disposed below, and is fixed to each loading plate 110 by a measuring connecting means 140 described later.

[0022] The heavy load support device 100 shown in Fig. 3 has a configuration in which a measuring means 120 is arranged between a pair of loading plates 110 (i.e., one upper loading plate 110U and one lower loading plate 110L), but it can also have a configuration in which two or more measuring means 120 are arranged between a pair of loading plates 110 as shown in Fig. 4. Fig. 4 is a diagram showing a heavy load support device 100 in which three measuring means 120 are arranged between a pair of loading plates 110, where (a) is a side view and (b) is a plan view.

[0023] 5 is a plan view showing the loading plate 110 of the heavy load support device 100 of FIG. 4. As shown in this figure, the loading plate 110 (upper loading plate 110U and lower loading plate 110L) is a plate-shaped member, and is preferably made of steel or high-strength resin so as to be able to resist the load to be applied. In addition, the loading plate 110 is formed with loading plate bolt holes 141H for fixing the measuring means 120, and metal fitting bolt holes 130H for connecting to the receiving metal fittings 200. In this figure, six loading plate bolt holes 141H and four metal fitting bolt holes 130H are formed for each measuring means 120, but the number and arrangement of these can be designed appropriately according to the conditions.

[0024] FIG. 6 is a side view showing the measuring means 120. The measuring means 120 can measure the load (FIG. 3(a)) in the direction substantially perpendicular (including perpendicular) to the loading plate 110 (particularly, the upper loading plate 110U), and can use, for example, a compression type load cell. Of course, as long as the load shown in FIG. 3(a) can be measured, various measuring devices can be used as the measuring means 120, not limited to the compression type load cell. Note that the measuring means 120 is provided with measuring device bolt holes 142H for fixing to the loading plate 110 (upper loading plate 110U and lower loading plate 110L) as shown in FIG. 6. Of course, the measuring device bolt holes 142H are formed in the same arrangement and number as the loading plate bolt holes 141H, and are formed on both the upper surface side and the lower surface side for fixing to the upper loading plate 110U and the lower loading plate 110L, respectively.

[0025] A reaction force due to the load is generated at each support point (e.g., bent) that supports the bridge girder, and usually, this reaction force is known in advance as a "design reaction force" by design calculations or the like. The weight support device 100 of the present invention can know that an appropriate load, that is, a load equal to (or close to) the design reaction force is acting when supporting the bridge girder by its measuring means 120. The measuring means 120 can also be made vertically expandable by using a jack or the like. This makes it possible to configure a weight support device 100 in which the distance between the upper loading plate 110U and the lower loading plate 110L changes. For example, when a load is applied to the weight support device 100 and the loads of the measuring means 120 are measured, and the measured values ​​are different from the design reaction force, the specified measuring means 120 can be expanded vertically to approach the design reaction force. Alternatively, when the load measured by the measuring means 120 shows that the load is not acting evenly on each of the multiple weight support devices 100, a specific measuring means 120 can be adjusted up and down to ensure that the load is acting evenly.

[0026] Furthermore, the measuring means 120 can be configured to be capable of measuring the load regardless of the top and bottom (i.e., whichever side faces upward). In this case, it is preferable that the weight support device 100 can be placed without worrying about the top and bottom when using it.

[0027] As described above, the measurement means 120 is disposed between the upper loading plate 110U and the lower loading plate 110L, and is fixed to the upper and lower loading plates 110 by the measurement connection means 140. This measurement connection means 140 can be composed of the loading plate bolt hole 141H, the measurement device bolt hole 142H, and the measurement device bolt. The inner walls of the loading plate bolt hole 141H and the measurement device bolt hole 142H are threaded to receive the measurement device bolt. In this case, after aligning the positions of the loading plate bolt hole 141H of the lower loading plate 110L and the measuring device bolt hole 142H (lower surface side) of the measuring means 120, the measuring device bolt is inserted into the loading plate bolt hole 141H and the measuring device bolt hole 142H, and similarly, after aligning the positions of the loading plate bolt hole 141H of the upper loading plate 110U and the measuring device bolt hole 142H (upper surface side) of the measuring means 120, the measuring device bolt is inserted into the loading plate bolt hole 141H and the measuring device bolt hole 142H, so that the measuring means 120 can be fixed. In this way, since the measuring means 120 is firmly fixed to the loading plate 110 by the measurement connecting means 140, there is no risk of "slippage" occurring between the measuring means 120 and the loading plate 110 even if a horizontal load caused by the bridge girder acts, that is, the weight can be supported stably. Furthermore, as long as the measurement connection means 140 can fix the measurement means 120 to the loading plate 110, it can be configured in various ways that are conventionally known instead of the configuration consisting of the loading plate bolt holes 141H, the measurement device bolt holes 142H, and the measurement device bolts.

[0028] However, the measuring means 120 cannot measure loads without limit, that is, an upper limit of the load that can be measured (hereinafter referred to as the "maximum measurable load") is set. Therefore, it is preferable that the heavy load support device 100 is structured so that it can support a heavy load up to the maximum measurable load of the measuring means 120. For this reason, it is preferable to manufacture the heavy load support device 100 after designing the materials, shapes, and dimensions of the loading plate 110 and the measuring means 120, or the fixing means of the loading plate 110 and the measuring means 120, while conducting tests, etc. In other words, in this case, the heavy load support device 100 can support a heavy load acting on a load (e.g., its own weight) that is equal to or less than the maximum measurable load.

[0029] The heavy load support device 100 may also be provided with a metal fitting connecting means 130. This metal fitting connecting means 130 is a means for connecting the heavy load support device 100 and the metal fitting 200. When connecting the heavy load support device 100 and the metal fitting 200, one metal fitting 200 may be connected to two or more heavy load support devices 100. For example, in Fig. 7 and Fig. 8, the metal fittings 200 arranged with their axes in the vertical direction are arranged so as to span the heavy load support devices 100 arranged in three rows with their axes in the horizontal direction, and then connected to the heavy load support devices 100. In this case, the multiple heavy load support devices 100 are each arranged on approximately the same (including the same) plane. Fig. 7 is a plan view showing the metal fittings 200 connected to the heavy load support devices 100 arranged in three rows, Fig. 8(a) is a side view in the direction of the arrow AA in Fig. 7, and Fig. 8(b) is a side view in the direction of the arrow BB in Fig. 7.

[0030] The metal fitting connecting means 130 can be constituted by the metal fitting bolt hole 130H, the metal fitting bolt 130B, and a bolt hole (hereinafter referred to as the "metal fitting side bolt hole") formed in the receiving metal fitting 200. The inner walls of the metal fitting bolt hole 130H and the metal fitting side bolt hole are threaded with threads for the metal fitting bolt 130B to be screwed into. In this case, as shown in FIG. 8, the heavy load support device 100 and the receiving metal fitting 200 can be connected by aligning the positions of the metal fitting bolt hole 130H and the metal fitting side bolt hole of the loading plate 110, and then inserting the metal fitting bolt 130B into the metal fitting bolt hole 130H and the metal fitting side bolt hole. In this way, the heavy load support device 100 and the receiving metal fitting 200 are firmly connected by the metal fitting connecting means 130, so that there is no risk of "misalignment" occurring between the heavy load support device 100 and the receiving metal fitting 200 even if a horizontal load caused by the bridge girder acts, and therefore the heavy load can be supported stably.

[0031] The receiving metal fittings 200 connected to the heavy load support device 100 can be further connected by stacking other receiving metal fittings 200. For example, in Fig. 8, the first row of receiving metal fittings 200 arranged in three rows is connected to the heavy load support device 100, and the second row of receiving metal fittings 200 similarly arranged in three rows is connected to the upper surface of the first row of receiving metal fittings 200. Note that in Fig. 8, the receiving metal fittings 200 are connected to the upper surface of the heavy load support device 100, but it is of course possible to connect the receiving metal fittings 200 to the lower surface of the heavy load support device 100, or to both the upper and lower surfaces of the heavy load support device 100.

[0032] 2.Heavy object support method Next, the method for supporting a heavy load of the present invention will be described with reference to Fig. 9. The method for supporting a heavy load of the present invention is a method for supporting a heavy load using the heavy load support device 100 described so far. Therefore, we will avoid any overlapping description with the description of the heavy load support device 100, and only describe the content unique to the method for supporting a heavy load of the present invention. In other words, the content not described here is the same as that described in "1. Heavy load support device".

[0033] 9 is a flow diagram showing the flow of the main steps of the method for supporting a heavy load according to the present invention. When supporting a heavy load using the heavy load support device 100, first, as shown in this figure, the heavy load support device 100 is placed at a predetermined position such as the top or bottom end of the bent BT ( Figure 9 Step 401). At this time, when a plurality of weight support devices 100 are used, it is advisable to place them on approximately the same (including the same) plane.

[0034] When the weight support device 100 is placed at a predetermined position, for example, the receiving bracket 200 is placed so as to span the weight support devices 100 ( Figure 9 Step 402), and connect the receiving metal fittings 200 to the respective weight support devices 100 by the metal fitting connecting means 130 ( Figure 9 Step 403).

[0035] When the receiving bracket 200 is connected to the weight support device 100, a bridge girder is placed on a separately installed jack (hereinafter referred to as a "bridge girder jack"), and the bridge girder is placed on the receiving bracket 200 while gradually lowering the bridge girder jack ( Figure 9 Step 404). At this time, the load is measured by the measuring means 120 ( Figure 9 Step 405), and compare it with the previously calculated design load (e.g., design reaction force). If the measured load is within the allowable range for the design load ( Figure 9 Step 406: Yes), and then place the bridge girder on the bracket 200. On the other hand, when the measured load falls outside the allowable range of the design load ( Figure 9 If the result is No in Step 406, or if there is variation in the load acting on the weight support device 100, the bridge girder is temporarily lifted using a bridge girder jack, and then the specified measuring means 120 is adjusted by extending and retracting up and down ( Figure 9 Step 407). Then, the measured load obtained by the measuring means 120 is compared with the design load again, and if the measured load falls within the allowable range of the design load, the bridge girder is placed on the receiving bracket 200 as is. [Industrial Applicability]

[0036] The heavy load support device and the heavy load support method of the present invention can be used for bridges of all kinds, such as road bridges and railway bridges, and can be used for bridges that cross various types of bridges, such as bridges that cross rivers, overpasses, overpasses, etc. According to the present invention, construction can be carried out while preventing accidents caused by unforeseen circumstances such as exceeding the design load, that is, the present invention provides safer work, and therefore it can be said to be an invention that can be expected to not only be used industrially but also to make a great contribution to society. [Explanation of symbols]

[0037] 100 Heavy load support device of the present invention 110 (loading plate for weight support device) 110U (loading plate) upper loading plate 110L (loading plate) lower loading plate 120 (Weight Support Device) Measuring Means 130 (Heavy load support device) metal fitting connection means 130H (Means for connecting metal fittings) Bolt hole for metal fittings 130B (Means for connecting metal fittings) bolts for metal fittings 140 (Weight Support Device) Measurement Connection Means 141H (instrument connection means) load plate bolt hole 142H (Measuring connection means) measuring device bolt hole 200 (Heavy load support device) bracket 300 (Heavy-duty support device) support structure BT Vent

Claims

1. an apparatus arrangement step of arranging two or more measuring apparatuses arranged in one row on a plane in two or more rows so that the measuring apparatuses are oriented in the same direction; A receiving metal fitting installation process for connecting receiving metal fittings to upper and / or lower surfaces of two or more of the measuring devices; A heavy object installation process of placing a bridge girder on an upper surface of the receiving metal fitting; and a load measuring step of measuring a load acting on a weight support device including the measuring device and the metal receiving fitting. The measurement device has two loading plates arranged vertically and one measurement means arranged and fixed between the loading plates, The measuring means is capable of measuring a load in a direction perpendicular or substantially perpendicular to the load plate, In the step of installing the receiving metal fittings, two or more rows of receiving metal fittings arranged so as to span two or more upper and / or lower loading plates and to be in the same direction are connected to the loading plates, In addition, in the receiving fitting installation step, a new receiving fitting is arranged so as to overlap the existing receiving fitting connected to the measuring device and to be perpendicular to the existing receiving fitting, and then the new receiving fitting is connected to the existing receiving fitting; The weight support device can support the bridge girder on which a load equal to or less than a maximum measurement load related to the measurement means acts. A bridge girder support method comprising:

2. A bent construction method for erecting a bridge girder while measuring the load, comprising: An apparatus arrangement step of arranging two or more measurement devices in one row on the vent so that the two or more measurement devices are aligned in the same direction; A receiving metal fitting installation process for connecting receiving metal fittings to upper and / or lower surfaces of two or more of the measuring devices; A heavy object installation process of placing the bridge girder on an upper surface of the receiving metal fitting; a load measuring step of measuring a load acting on a weight support device including the measuring device and the metal receiving fixture; and removing the measuring device together with the vent after connecting the bridge girders together, The measurement device has two loading plates arranged vertically and one measurement means arranged and fixed between the loading plates, The measuring means is capable of measuring a load in a direction perpendicular or substantially perpendicular to the load plate, In the step of installing the receiving metal fittings, two or more rows of receiving metal fittings arranged so as to span two or more upper and / or lower loading plates and to be in the same direction are connected to the loading plates, The weight support device can support the bridge girder on which a load equal to or less than a maximum measurement load related to the measurement means acts. A bridge girder support method comprising:

3. The method further includes a load adjustment step of adjusting the load acting on the weight support device when the measured load measured in the load measurement step falls outside a predetermined allowable range of the design load.

3. The bridge girder support method according to claim 1 or 2.

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