JPH08260417A - Finishing screed - Google Patents

Abstract

PURPOSE: To improve the accuracy in finishing a road surface by forming a finishing screed compact in size as a whole, decreasing the number of equipments and preventing the backward relative displacement of uncured concrete. CONSTITUTION: An engaging stepped section, in which a screed is divided from a center and by which a through-interval in a straight line is not generated in the horizontal and longitudinal direction by mutually engaging the engaging stepped section with each opposed end section of a pair of left and right screeds 10a, 10b loosely, is formed. A central lifting device 26 integrally moving the opposed end sections of a pair of the screeds 10a, 10b vertically and stopping the screeds at the places of arbitrary height is provided. One reciprocating driving device 18 being synchronized with both screeds 10A, 10B and reciprocating and driving both screeds in the longitudinal direction is disposed at the opposed end sections of the screeds.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finishing screed mounted on a concrete paving finishing device.
More specifically, the present invention relates to a finishing screed having a simple structure equipped in a concrete pavement finishing device for compacting a pavement surface when paving a road or the like with a high-viscosity fluid such as concrete.

[0002]

2. Description of the Related Art Conventionally, when pavement of roads, parking lots, airport aprons, etc. is mainly made of concrete, raw concrete poured into a predetermined position (hereinafter referred to as "green concrete") is cut into a predetermined range and compacted. In addition, a concrete paving finishing device (hereinafter referred to as a concrete finisher) is used to perform surface finishing.

Such a concrete finisher is disclosed, for example, in Japanese Utility Model Publication No. 5-27106.

As shown in FIG. 7 ((a) is a plan view and (b) is a sectional view taken along the line D-D of (a)), this concrete finisher 51 places concrete in a predetermined paving range. Cutting screed 52 for cutting
A compacting machine 54 for compacting the cut concrete with a vibrating frame 53 mounted thereon, and a finishing screed 55 for finishing the compacted concrete surface into a horizontal state or a flat state with a predetermined gradient. It is generally composed of The leveling screed 52, the compactor 54, and the finishing screed 55 are all extended in a direction transverse to the traveling direction of the concrete finisher 51.

The finishing screed 55 rubs the road surface by reciprocating in the longitudinal direction (a direction transverse to the traveling direction of the concrete finisher 51) to improve the flatness thereof. In addition, the arrow E direction in the drawing indicates the front (moving direction) of the concrete finisher 51. The concrete finisher 51 has wheels 56 at both ends thereof, and finishes the paved surface while moving on rails 57 laid in advance.

The finishing screed 55 is shown in FIG.
As shown in (a), they are arranged in front and rear two rows. The rear long screed 55a has a length over the entire width of the concrete finisher 51, and the front short screed 55b has a length of about half extending from the center of the concrete finisher 51 to one side. In this way, the two screeds were installed to finish the road surface in both slopes as described below.

FIG. 7 (b) shows a state in which both screeds 55a and 55b are inclined in opposite directions so that the finishing screed 55 has a road surface with both slopes. That is, the center of the finished surface is raised and both ends are tilted low.

Although not shown in the figure, both screeds 55a and 55b are made horizontal when the road surface is finished horizontally, but the short screed 55b is often used only with the long screed 55a raised upward.
Although not shown, both screeds 55a and 55b may be tilted in the same direction when finishing the road surface to have a single gradient, but in this case as well, the short screed 55 is also used.
Often, b is raised upward and only the long screed 55a is used.

[0009]

In the above-mentioned conventional concrete finisher 51, since two finishing screeds 55 are provided at the front and rear, it becomes an extremely large-sized device and must be divided during normal trailer transportation. The division work and the assembling work at the construction site require complicated work. Moreover, it requires a large trailer or multiple trailers.

In addition, at the time of construction, it may be necessary for an operator to enter the front of the long screed 55a and perform a manual leveling work of the concrete as an auxiliary work for the operation of the finishing screed 55. In such a case, The short screed 55b gets in the way.

Further, when finishing on a road surface with both slopes, a phenomenon in which uncured concrete relatively escapes behind the concrete finisher 51 so as to avoid both screeds 55a and 55b (shown by arrow F in FIG. 7a). Also occurs.

The present invention has been made in order to solve the above problems. Although it is a split type, it is only one in the front-rear direction. The purpose of the present invention is to provide a finishing screed that can improve the finishing accuracy of the road surface by providing a step portion that prevents relative movement of the concrete finisher. Moreover, it is an object of the present invention to provide a concrete finisher that can secure a sufficient space for workers in front of the finishing screed.

[0013]

The finishing screed of the present invention is a concrete finisher,
In order to finish the concrete surface compacted by the compactor horizontally or in an inclined manner, a finishing screed that can be reciprocated in the right-angled direction and is extended in a direction substantially perpendicular to the construction progress direction of the concrete finisher. It is divided into two screeds in both directions from the middle part thereof, and the opposite ends of the pair of screeds are loosely engaged with each other so that the screeds penetrate straightly in the horizontal front-rear direction. It is characterized in that a step portion that does not generate a gap is formed.

In this finishing screed,
At the center of the concrete finisher, an elevating device for vertically moving the opposing ends of the pair of screeds is arranged, and the elevating device can stop the opposing ends of the screed at an arbitrary height position. It is preferable that the screeds of the front and rear rows and the split type can be easily formed into the postures for the both-gradient finishing.

In the vicinity of the opposite ends of the pair of screeds,
It is preferable to dispose a single driving device for synchronously reciprocating both screeds in the longitudinal direction from the standpoint of facilitating the road surface finishing operation of the front and rear row and split type screeds.

The drive device is composed of a single motor, an endless track rotated by the motor, a pair of crank members rotatably driven by the endless track, and the crank members and the screeds, respectively. It is preferable that it is composed of a pair of connecting rods for the purpose of facilitating the synchronization of the operations of both screeds.

In addition to the elevating device, both ends of each screed are moved up and down in synchronization with each other near the opposite ends of the pair of screeds and the other end of each screed. It is preferable in that starting and ending of construction work, forwarding and avoiding obstacles can be easily performed.

[0018]

According to the finishing screed of the present invention,
Since the opposing end portions of the left and right screeds that are divided into two are provided with the step portions that engage with each other, it is possible to prevent the uncured concrete from moving backward with respect to the concrete finisher that advances during the construction. . Therefore, the finishing accuracy of the road surface is improved. Furthermore, although it is a left-right split type, it has a single structure in the front-back direction, so the number of various devices such as a drive device that reciprocates the finishing screed and an elevating device that moves it up and down is also reduced. Cost is reduced.

Further, according to the concrete finisher having the finishing screed of the present invention, the dimension of the concrete finisher in the front-rear direction is much smaller than that of the conventional one. Therefore, the size is reduced, the transportation is facilitated, and a sufficient space for the worker is secured in front of the finishing screed.

[0020]

Embodiments of the finishing screed of the present invention and a concrete finisher having the same will be described below with reference to the accompanying drawings.

FIG. 1 (a) is a plan view showing an example of a concrete finisher having a finishing screed according to an embodiment of the present invention, FIG. 1 (b) is a side view of the concrete finisher, and FIG. 2 (a) is a book showing the same. FIG. 2 is a plan view showing an embodiment of the finishing screed of the invention, FIG.
3 (a) is a plan view showing a central drive portion of the finishing screed of FIG. 2, FIG. 3 (b) is a front view thereof, and FIG.
2B is a sectional view taken along the line BB, FIG. 5 is an enlarged view of the left end portion of the finishing screed of FIG. 2B, and FIG.
FIG. 6B is a plan view showing an engaging portion of both screeds in FIG. 6, and FIG.

As shown in FIG. 1, the concrete finisher 1 compacts the cut and screed 2 for cutting the concrete into a predetermined paving range and the cut concrete by the attached vibration frame 3. It is generally composed of a compacting machine 4 and a finishing screed 5 for finishing the compacted concrete surface into a horizontal state or a flat state having a predetermined gradient. The cutting and leveling screed 2, the compactor 4, and the finishing screed 5 are all extended in a direction transverse to the traveling direction of the concrete finisher 1. The concrete finisher 1 is usually provided with wheels 6 at both ends thereof, and finishes a pavement surface while moving on rails 7 laid in advance.

The direction of arrow A in the figure is the front of the concrete finisher.

A finishing screed 5 is shown in FIG. The finishing screed 5 has the wheels 6
A pair of side frames 8 in which the above are arranged, a reinforcing frame 9 bridged between both side frames 8, a left screed 1
0a, a right screed 10b, a central drive unit 11 and end drive units 12 on both sides. Both screed 1
0a and 10b (hereinafter, both screeds are collectively referred to as screeds 10 as appropriate) of the drive unit 1 at both ends.
It is the structure suspended by the reinforcement frame 9 by 1 and 12. In the figure, the screed indicated by the chain double-dashed line indicates a state in which the central drive unit 11 is actuated and the central portion is lifted for the purpose of finishing both gradients.

Slide portions are formed on both side portions 9a of the reinforcing frame 9 and are configured to be telescopically inserted into the central portion 9b. The insertion drive is performed by pushing and pulling the side frame 8 by the hydraulic cylinder 14. By doing so, the length of the reinforcing frame 9 is continuously changed in accordance with the width of the constructed road surface or the like.

On the other hand, the screed 10 is not designed to have its length continuously changed, but various screed elements 16 of various detachable sizes may be removed or added.

The central drive unit 11 includes a reciprocating drive unit 18, a central lifting unit 26, and a central vertical drive unit 31, which will be described later. The opposing end portions of both screeds 10a and 10b are provided with a slope of the finish road surface. It can be moved up and down as a unit for adjustment.
It is also possible to reciprocate a and 10b in the same direction in their longitudinal direction (so-called left-right direction) while keeping the heights of their opposing ends the same. The maximum distance of vertical movement is not particularly limited, but is usually about 150 mm, and the stroke of reciprocating left and right movement is not particularly limited, but is usually about 100 mm.

The vertical movement of the screed by the central drive unit 11 can be stopped continuously at any height position to set the gradient of the finished surface, and at the start and stop of construction work and during forwarding and obstacles. It is also possible to instantly raise and lower by a predetermined height when avoiding.

The end drive unit 12 can also vertically move the other ends of the screeds 10a and 10b in synchronization with each other, for example, at the start of construction work.

FIG. 3 shows the details of the central drive unit 11. 3A is a plan view and FIG. 3B is a front view.

Reference numeral 17 denotes a substrate, and a reciprocating drive device 18 for reciprocating the screeds 10a and 10b in the longitudinal direction is provided on the upper surface of the substrate 17. The reciprocating drive device 18 has the following configuration. That is, the crank members 19a and 19b for both screeds 10a and 10b are installed. The crank members 19a and 19b and the screeds 10a and 10b are connected to the connecting rods 20a and 2b, respectively.
They are linked by 0b. Each connecting rod 20a, 20b
Is pivotally supported at both ends thereof. Both of the crank members 19a and 19b are driven by a single drive device 21 installed on the base plate 17 to form a pair of chains 22a and 22b.
It is rotationally driven via. With such a configuration, and by adjusting the connecting position of the connecting rods 20a, 20b to the crank members 19a, 19b, both screeds 10a, 1a.
0b is simultaneously reciprocated in the same direction. The crank members 19a and 19b in this embodiment are both
A sprocket wheel that meshes with the chains 22a and 22b is provided. The end portions of the connecting rods 20a and 20b are rotatably supported at a portion eccentric from the rotation center of the sprocket wheel. Thereby, by rotating the sprocket wheel, the connecting rod 20a,
One end of 20b rotates and the other end reciprocates. As a result, the screed 10 connected to the other end reciprocates.

On the other hand, L-shaped engaging pieces 23a and 23b are fixedly provided on the upper surfaces of the screeds 10a and 10b, respectively.
It is slidably sandwiched by the sandwiching members 24a and 24b arranged on the lower surface of 7.

Specifically, the engagement pieces 23a and 23b are sandwiched by the sandwiching rollers 25a and 25b (see also FIG. 4) provided on the sandwiching members 24a and 24b, respectively. With such a configuration, both screeds 10a, 10
b can be smoothly reciprocated to the left and right while the opposite ends are held at the same height.

Reference numeral 26 is a central elevating device for integrally raising and lowering opposing ends of the screeds 10a and 10b in order to adjust the gradient of the finish road surface.
As is apparent from FIG. 4 showing the side surface of the central lifting device 26, the screw rod 28 rotated by the driving device 27 is moved downward from the driving device 27 installed on the reinforcing frame 9. The screw rod 28 is extended and the lower end portion of the screw rod 28 is screwed into a nut member 30 fixed to the connecting member 29. Further, the connecting member 29 and the substrate 17 are connected by a center vertical movement drive device 31 described later. Therefore, the board 17 is connected to the screw rod 28 and the connecting member 2
9 and the central up-and-down drive device 31 through the reinforcing frame 9
It is hung on. Therefore, when the screw rod 28 is rotated by the driving device 27, the substrate 17 is moved up and down through the connecting member 29 and the central vertical movement driving device 31, and further, the opposite end of the screed is moved up and down through the holding members 24a and 24b. To be Moreover, it can be stopped and fixed at any position. In this way, the gradient of the screed 10 can be finely adjusted. Of course, even if the nut member 30 is directly connected to the driving device 27 and the lower end of the screw rod 28 is fixed to the connecting member 29, and the nut rod 30 is rotated to move the screw rod 28 up and down without rotating, The same effect can be achieved.

The central vertical movement drive device 31 lifts the entire screed 10 at a predetermined height in a short time while keeping the inclination thereof at the time of starting and ending the construction work, when forwarding the work and when avoiding obstacles. It is for lowering and lowering. Therefore, a hydraulic jack or the like is usually used. The main body 31a of the central up-and-down drive unit is the connecting member 2
9 is fixed to the base plate 17 at the lower end of its rod 31b.
Has been fixed. The end drive parts 12 are provided at both ends of the screed 10. The end drive parts 12 are
As described above, since it is necessary to raise and lower the entire screed 10 at the time of starting the construction work, the end vertical movement drive device 32 having the same structure can be operated in synchronization with the central vertical movement drive device 31. It is equipped (see FIG. 5).

FIG. 5 shows the details of the end vertical moving device 32 for the left screed 10a as a representative. That is, the hydraulic jack body 33 fixed to the reinforcing frame 9
The rod 33b extends downward from a, and its tip is fixed to the holding member 34. The sandwiching member 34 has the same structure as the sandwiching members 24a and 24b, has a sandwiching roller (not shown), and allows a locking piece 35 fixedly mounted on the upper surface of the end of the screed 10a to slide. It is sandwiched. Therefore, the screed 10a is vertically moved up and down by a predetermined height in a short time while being allowed to reciprocate in the longitudinal direction.

The following operations can be performed by the above-mentioned central lifting device 26, central vertical movement driving device 31, and end vertical movement driving device 32.

That is, at the start or end of the construction work, the central vertical movement drive unit 31 and the end vertical movement drive unit 32 are operated in synchronization with each other to move the screed 10 up and down integrally in a short time. Further, both the devices 31 and 32 may be operated in synchronization even when the road surface is finished horizontally. When finishing to both slopes, only the central elevating device 26 is operated. These are examples of construction work.

FIG. 6 shows the vicinity of opposite ends of both screeds 10a and 10b. 6A is a plan view and FIG.
(B) is a front view.

As shown in FIG. 6 (a), the opposite end portions of the screeds 10a and 10b are respectively engaged with the engaging step portions 36a and 3 on the opposite sides in the vertical plane when viewed in the longitudinal direction.
6b are formed and they are engaged with each other. After engaging with each other, a gap S of about 75 mm is formed between the opposite ends. Therefore, the penetration of the gap is prevented in the front-rear direction of the concrete finisher, and the uncured concrete does not escape relatively rearward through the gap S during construction.

The shape of the stepped portion is not limited to that shown in FIG. 6 (a), and may be, for example, a convex shape or a concave shape that engage with each other.

Further, the notched C portion is the above-mentioned connecting portion of the screed element and is connected by bolting.

[0043]

According to the finishing screed of the present invention, it is possible to prevent the uncured concrete from moving rearward with respect to the concrete finisher that advances during the construction. Therefore, the finishing accuracy of the road surface is improved.
Further, since the number of various devices such as the driving device and the lifting device is also reduced, the manufacturing cost is reduced.

Further, according to the concrete finisher having the finishing screed of the present invention, the dimension of the concrete finisher in the front-rear direction is much smaller than that of the conventional one. Therefore, the size is reduced, the transportation is facilitated, and a sufficient space for the worker is secured in front of the finishing screed.

[Brief description of drawings]

FIG. 1 (a) is a plan view showing an example of a concrete finisher having a finishing screed according to an embodiment of the present invention, and FIG. 1 (b) is a side view thereof.

2 (a) is a plan view showing an embodiment of the finishing screed of the present invention, and FIG. 2 (b) is a front view thereof.

3 (a) is a plan view showing a central drive unit of the finishing screed of FIG. 2, and FIG. 3 (b) is a front view of the same.

FIG. 4 is a sectional view taken along line BB of FIG.

5 is an enlarged view of a left end portion of the finishing screed shown in FIG. 2 (b).

6 (a) is a plan view showing an engaging portion of both screeds in FIG. 2, and FIG. 6 (b) is a front view thereof.

7 (a) is a plan view showing an example of a conventional concrete finisher, and FIG. 7 (b) is FIG. 7 (a).
6 is a cross-sectional view taken along line DD of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Concrete finisher 5 ... Finishing screed 8 ... Side frame 9 ... Reinforcement frame 10a ... Screed 10b ... Screed 26 ... Central lifting device 31 ... Central vertical movement drive device 32 ... End vertical movement drive device 36a ... Engagement step portion 36b ... Engagement step portion

Front page continuation (72) Inventor Makoto Kudo 1-19-11 Kyobashi, Chuo-ku, Tokyo Within Japan Tamaido Co., Ltd. (72) Inventor Noboru Shimooka 1-1-19-11 Kyobashi, Chuo-ku, Tokyo Stocks of Japan Tamaido In-house (72) Inventor Koichiro Morisaki 2680 Oka, Inami-cho, Kako-gun, Hyogo Prefecture Kawasaki Heavy Industries Ltd. in Banshu Plant (72) Inventor Katsuhide Kosaka 2680 Oka, Inami-cho, Kako-gun Hyogo Prefecture In Banshu Plant, Kawasaki Heavy Industries Ltd.

Claims (5)

[Claims] 1. A concrete pavement finishing device,
In order to finish the concrete surface compacted by the compacting machine horizontally or inclined, the finishing which is reciprocally movable in the direction perpendicular to the direction of progress of the construction of the concrete paving finishing device is completed. The screed is divided into two screeds in both directions from the middle part thereof, and the opposite ends of the pair of screeds are loosely engaged with each other to form a straight line in the horizontal front-rear direction. A finishing screed formed with a step portion that does not create a through gap. 2. A concrete pavement finishing device has a lifting device at the center thereof for vertically moving the facing ends of the pair of screeds integrally, and the lifting device raises the facing ends of the screed to an arbitrary height. The finishing screed according to claim 1, wherein the finishing screed is configured so that it can be stopped at a position. 3. The finishing screed according to claim 1, wherein one driving device for synchronously reciprocally driving both screeds in the longitudinal direction is disposed near the opposite ends of the pair of screeds. 4. The drive device includes one motor, an endless track rotated by the motor, a pair of crank members rotatably driven by the endless track, each crank member and each screed. The finishing screed according to claim 3, comprising a pair of connecting rods for connecting each. 5. A moving device is provided near the opposite ends of the pair of screeds and at the other end of each screed so that both ends of each screed can be moved up and down by approximately the same size in synchronization. The finishing screed according to claim 1.