Device for checking the construction status of lining concrete

Abstract

The goal is to enable real-time monitoring of the concrete lining being poured into the concrete pouring space during the concrete lining concrete pouring process. [Solution] This is a device 1 for checking the construction status of lining concrete that is filled into the concrete pouring space 5 between the formwork 3 and the natural ground wall surface 4. A pin member 10 is provided that is inserted into the concrete pouring space 5 from the formwork 3 side toward the natural ground wall surface 4. At least the tip of the pin member 10 is made of a transparent material, and a camera insertion hole 11 is provided inside the pin member 10 for inserting a camera 12 that extends toward the tip. When pouring lining concrete, the camera 12 is inserted into the camera insertion hole 11 so that the construction status of the lining concrete being poured into the concrete pouring space 5 can be observed in real time.

Description

Technical Field

[0001] The present invention relates to a construction condition confirmation device for covering concrete that can observe in real time the construction condition of the covering concrete placed in the concrete placement space during the placement of the covering concrete.

Background Art

[0002] For example, in the construction of mountain tunnels represented by the NATM method, after excavation by blasting or the like, shotcrete is applied to the inner wall surface of the excavated tunnel, rock bolts are driven in, and then, while sequentially moving the center (mobile steel formwork) in the tunnel direction, a waterproof sheet is stretched along the inner peripheral surface of the shotcrete for each span in the tunnel direction (this surface becomes the ground side wall surface), and the formwork of the center is installed along the circumferential direction with a distance from this ground side wall surface, and covering concrete or mortar is placed in the concrete placement space between the ground side wall surface and the formwork, and after a predetermined curing period has elapsed, the form is removed.

[0003] In the range where construction is possible, it is more economical for the thickness of the covering concrete to be thinner, but in previous construction examples, generally about 30 cm is used as a guide, and there are some differences depending on the size of the tunnel cross-section, the ground classification, etc.

[0004] To confirm the thickness of the covering concrete, it is common to install a detection pin on the formwork. The detection pin includes a pin member that penetrates the concrete placement space from the outer surface of the formwork (the inner space side surface of the tunnel) and reaches the ground side wall surface (the surface of the waterproof sheet). The confirmation of the thickness using this detection pin is to place concrete in the concrete placement space with the detection pin installed on the formwork, and measure the thickness with a steel scale or the like using the through-hole formed when the pin member is pulled out after construction.

[0005] Some of the aforementioned inspection pins are equipped with air vents that penetrate from the tip of the pin member to the outer surface of the formwork, taking advantage of the fact that the pin member penetrates to the ground-side wall, so as to prevent voids from remaining on the back of the lining when concrete is poured. Others are equipped with a filling detection sensor at the tip of the pin member to allow for the determination of the concrete filling level, and as disclosed in Patent Document 1 below, some are equipped with a temperature measuring element at the tip of the pin member to allow for the measurement of the temperature of the lining concrete. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2021-110605 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] However, with conventional measuring pins, it was not possible to check the construction status of the lining concrete being poured into the concrete pouring space in real time during the pouring of the lining concrete.

[0008] Therefore, the main objective of the present invention is to provide a device for confirming the construction status of lining concrete that allows for real-time observation of the construction status of lining concrete being poured into the concrete pouring space during the pouring of lining concrete. [Means for solving the problem]

[0009] To solve the aforementioned problems, the present invention according to claim 1 provides a device for confirming the construction status of lining concrete filled in the concrete pouring space between the formwork and the ground-side wall surface, A pin member is provided that is inserted into the concrete pouring space from the formwork side toward the ground-side wall surface, and at least the tip of the pin member is made of a transparent material, and a camera insertion hole is provided inside the pin member for inserting a camera that extends toward the tip. A device for confirming the construction status of concrete lining is provided, characterized in that, when concrete lining is poured, the camera is inserted into the camera insertion hole, allowing for real-time observation of the construction status of the concrete lining being poured into the concrete pouring space.

[0010] In the invention described in claim 1 above, the device for checking the construction status of lining concrete includes a pin member that is inserted into the concrete pouring space from the formwork side toward the ground side wall surface, and at least the tip of this pin member is made of a transparent material, and the pin member has a camera insertion hole inside for inserting a small camera that extends toward the tip. Therefore, when pouring lining concrete, by inserting the camera into the camera insertion hole, the construction status of the lining concrete being poured into the concrete pouring space can be observed in real time. Furthermore, after construction, the pin member can be removed and the thickness of the lining concrete can be measured with a steel scale or the like, making it possible to check the thickness of the lining concrete in the same way as with conventional measuring pins.

[0011] As part of the present invention according to claim 2, a device for confirming the construction status of lining concrete is provided, wherein the pin member is fitted inside a cylindrical outer cylinder member and supported in a state protruding from the tip of the outer cylinder member, and the outer cylinder member is fitted inside a cylindrical guide member fixed to the formwork and supported in a state protruding into the concrete pouring space, as described in claim 1.

[0012] The invention described in claim 2 above specifically defines the support structure for the pin member, wherein the pin member is fitted inside a cylindrical outer cylinder member and supported in a state where it protrudes from the tip of the outer cylinder member, and the outer cylinder member supporting the pin member is fitted inside a cylindrical guide member fixed to the formwork and supported in a state where it protrudes into the concrete pouring space. In this way, by fitting the outer cylinder member onto the pin member and fitting the outer cylinder member into the guide member fixed to the formwork, the pin member can be supported by the formwork in a state where it protrudes into the concrete pouring space.

[0013] As part of the present invention according to claim 3, the pin member is provided such that the outer shape of the portion protruding from the tip of the outer cylinder member gradually decreases toward the tip, thereby providing a device for checking the construction status of lining concrete according to claim 2.

[0014] In the invention described in claim 3 above, the outer shape of the pin member that protrudes from the tip of the outer cylinder member is provided with a taper that gradually narrows towards the tip, so that the pin member can be easily removed when removing it after installation.

[0015] As part of the present invention according to claim 4, the outer cylindrical member is provided such that the outer shape of the portion protruding into the concrete pouring space gradually decreases towards the tip, thereby providing a device for checking the construction status of lining concrete according to claim 2.

[0016] In the invention described in claim 4 above, the outer shape of the outer cylinder member of the portion that protrudes into the concrete pouring space is provided with a taper that gradually narrows towards the tip, so that the outer cylinder member can be easily removed when it is removed after construction.

[0017] As part of the present invention according to claim 5, the pin member is formed from a transparent material over its entire length, and the device for checking the construction status of lining concrete according to claim 1 is provided.

[0018] In the invention according to claim 5 above, since the pin member is formed transparently over its entire length, when a camera is inserted into the camera insertion hole, a wide range of concrete placement space can be observed.

[0019] As the invention according to claim 6, there is provided a device for confirming the construction status of concrete formwork according to claim 1, wherein the pin member is composed of a tip portion of the pin member formed of a transparent material and a base end portion of the pin member having a hollow cylindrical shape.

[0020] In the invention according to claim 6 above, since only the tip portion of the pin member is formed transparently, it is particularly easy to confirm the placement status of the top end portion where air is likely to accumulate during the placement of the concrete formwork.

[0021] As the invention according to claim 7, there is provided a device for confirming the construction status of concrete formwork according to claim 1, wherein the camera is an omnidirectional camera.

[0022] In the invention according to claim 7 above, by using an omnidirectional camera as the camera, when inserted into the camera insertion hole, the 360° placement status of the concrete placement space can be grasped.

[0023] As the invention according to claim 8, there is provided a device for confirming the construction status of concrete formwork according to claim 1, wherein an air vent hole penetrating the tip portion and the outside of the formwork is provided inside the pin member.

[0024] In the invention according to claim 8 above, since an air vent hole penetrating the tip portion and the outside of the formwork is provided inside the pin member, air and bleeding water during concrete placement can be discharged through this air vent hole, and the quality of the concrete formwork can be improved.

Effect of the Invention

[0025] As described in detail above, according to the present invention, during the placement of the concrete formwork, the construction status of the concrete formwork placed in the concrete placement space can be observed in real time.

Brief Description of Drawings

[0026] [Figure 1] It is a side view (cross-sectional view in the tunnel axis direction) of the center where the construction status confirmation device 1 for covering concrete according to the present invention is installed. [Figure 2] It is a front view (cross-sectional view in the tunnel width direction) of the center where the construction status confirmation device 1 for covering concrete is installed. [Figure 3] It is an enlarged view of the formwork part to which the construction status confirmation device 1 for covering concrete is attached. [Figure 4] Showing the pin member 10, (A) is a longitudinal sectional view and a plan view, and (B) is a longitudinal sectional view and a plan view when (A) is rotated 90°. [Figure 5] Showing a modified example of the pin member 10, (A) is a longitudinal sectional view and a plan view, and (B) is a longitudinal sectional view and a plan view when (A) is rotated 90°. [Figure 6] Showing the outer cylinder member 13, (A) is a longitudinal sectional view, and (B) is a plan view. [Figure 7] It is an enlarged view of the formwork part to which the guide member 14 is attached.

Embodiments for Carrying Out the Invention

[0027] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0028] The construction status confirmation device 1 for covering concrete according to the present invention is a device for confirming in real time the construction status of the covering concrete filled in the concrete placing space 5 between the formwork 3 of the center 2 and the natural ground side wall surface 4 as shown in FIGS. 1 and 2.

[0029] The aforementioned construction status confirmation device 1 is installed when constructing a mountain tunnel. After excavation is carried out one span at a time in the tunnel direction by blasting, etc., sprayed concrete is applied to the excavated inner wall surface of the tunnel by spraying, rock bolts are driven in, a waterproof sheet is attached to the surface, a formwork 3 for centering 2 is installed along the circumferential direction with a distance between it and the ground side wall surface 4, and when lining concrete is poured into the concrete pouring space 5 between the ground side wall surface 4 and the formwork 3, the device is inserted into the concrete pouring space 5 from the outer side (inside the tunnel) of the formwork 3.

[0030] The centering device 2 is installed behind the heavy machinery used for tunnel construction and, as shown in Figures 1 and 2, mainly consists of a formwork 3 that is arranged to form a space of a predetermined width (concrete pouring space 5) between it and the tunnel's natural ground side wall 4, a support frame 6 that supports the formwork 3, and a running rail 7 that the support frame 6 can run on and which is laid on the underside of the tunnel.

[0031] As shown in Figure 1, the construction status confirmation device 1 can be installed at any position relative to the tunnel axis direction relative to the formwork 3, and as shown in Figure 2, it can be installed at least at the top (summit) of the tunnel in the circumferential direction. In the illustrated example, it is also installed at one location on each side in the circumferential direction with a gap in between, for a total of three locations. In the illustrated example, it is installed at one location relative to the tunnel axis direction, but it may be installed at multiple locations.

[0032] As shown in Figure 3, the construction status confirmation device 1 includes a pin member 10 that is inserted into the concrete pouring space 5 from the formwork 3 side toward the ground side wall surface 4. The pin member 10 is formed of a transparent material at least at its tip, and is provided with a camera insertion hole 11 inside for inserting a small camera 12 that extends toward the tip.

[0033] As shown in Figure 4, the construction status confirmation device 1 allows for real-time observation of the construction status of the lining concrete being poured into the concrete pouring space 5 by inserting the camera 12 into the camera insertion hole 11 during the pouring of the lining concrete. Furthermore, after construction, the pin member 10 can be removed and the thickness of the lining concrete can be measured using a steel scale or the like, allowing for confirmation of the thickness of the lining concrete in the same way as with conventional measuring pins.

[0034] As shown in Figure 3, the camera 12 has a structure in which a cable 12b is connected to the rear of the camera body 12a at the tip, and a small camera body 12a that can be inserted into the camera insertion hole 11 is used. Furthermore, it is preferable to use an omnidirectional camera (360° camera) as the camera 12 so that the concrete pouring space 5 can be observed all around when it is installed on the tip of the pin member 10. This makes it possible to more reliably grasp the pouring status of the lining concrete approaching from any direction.

[0035] To further explain the structure of the construction status confirmation device 1, as shown in Figure 3, the pin member 10 is fitted inside a cylindrical outer cylinder member 13 and is supported in a state where it protrudes from the tip of the outer cylinder member 13 toward the ground-side wall surface 4. The outer cylinder member 13 is fitted inside a cylindrical guide member 14 fixed to the formwork 3 and is supported in a state where the tip of the outer cylinder member 13 protrudes into the concrete pouring space 5.

[0036] As shown in Figure 4, the pin member 10 has an elongated rod-like shape, and a flange portion 10a for stopper, pressing, and pulling is formed at its base end. The pin member 10 is preferably formed with a circular cross-section as shown in the illustrated example, but it can also be formed with a polygonal cross-section such as a square. When the pin member 10 is installed in the formwork 3, as shown in Figure 3, one end edge on which the flange portion 10a is formed protrudes outward from the formwork 3 (towards the tunnel interior), while the other end edge on the opposite side is inserted into the concrete pouring space 5 and is positioned in contact with the ground-side wall surface 4.

[0037] Inside the pin member 10, there is a camera insertion hole 11 for inserting a small camera 12, which extends from one end edge where the flange portion 10a is formed to the vicinity of the other end edge. The camera insertion hole 11 is a linearly extending hole formed by drilling a hole to a predetermined depth from one end edge where the flange portion 10a is formed, and it opens to one end edge but does not penetrate to the other end edge. As shown in Figure 4(A), the length S of the undrilled portion remaining at the bottom of the drilled hole should be such that the bottom of the camera insertion hole 11 protrudes from the tip of the outer cylinder member 13, and the other end edge of the pin member 10 is in contact with the ground-side wall surface 4, and the poured lining concrete is inserted to the bottom of the camera insertion hole 11, allowing the viewer to see how the poured lining concrete fills up to the ground-side wall surface 4. Specifically, it should be 10 to 50 mm, preferably 10 to 30 mm.

[0038] As shown in Figure 4(B), an air vent hole 15 is formed inside the pin member 10, parallel to the camera insertion hole 11, and passing through the tip and the outside of the formwork 3. This air vent hole 15 is a linearly extending through-hole that passes through one end edge and the other end edge where the flange portion 10a is formed, and is an independently provided through-hole that does not communicate with the camera insertion hole 11. By providing the air vent hole 15, air and bleeding water can be discharged through this air vent hole 15 during concrete placement, thereby improving the quality of the lining concrete.

[0039] The pin member 10 is formed such that the outer diameter of the portion protruding from the tip of the outer cylinder member 13 gradually decreases towards the tip. As shown in the illustrated example, when the pin member 10 is formed with a circular cross-section, the outer diameter of the portion protruding from the tip of the outer cylinder member 13 gradually decreases towards the tip. In other words, as shown in Figure 3, the axial section of the outer cylinder member 13 protruding from the edge on the concrete pouring space 5 side is formed with an outer diameter that tapers toward the tip, and the axial section fitted into the outer cylinder member 13 and the axial section below it up to the flange portion 10a are formed with the same outer diameter. By providing such a taper, the pin member 10 can be easily pulled out when it is time to remove it after construction.

[0040] The pin member 10 is formed of a transparent material at least at its tip. A wide range of known transparent materials can be used, including acrylic resin, polyethylene terephthalate, polystyrene resin, polycarbonate, and AS resin. In particular, acrylic resin is preferred due to its high transparency, durability, and processability.

[0041] In the example shown in Figure 4, the pin member 10 is made of a transparent material along its entire length. To form the camera insertion hole 11 and the air vent hole 15 in such a pin member 10, the camera insertion hole 11 is formed by drilling a hole to a predetermined depth in a solid round bar from one end (the end facing the tunnel interior) to the other end (the end facing the ground wall 4), and the air vent hole 15 is formed by drilling a hole adjacent to the camera insertion hole 11 that penetrates both ends.

[0042] As an alternative modification of the pin member 10, as shown in Figure 5, the pin member 10 can be composed of a pin member tip portion 16 made of a transparent material and a hollow cylindrical pin member base portion 17. The pin member tip portion 16 and the pin member base portion 17 are joined together as shown in the illustrated example by providing a stepped portion on the joining end of the pin member tip portion 16, with the outer circumference cut out over an appropriate axial section, and fitting the tip of the pin member base portion 17 onto this stepped portion and fixing it with an adhesive or the like.

[0043] The transparent material constituting the tip portion 16 of the pin member is the same as described above. On the other hand, the base portion 17 of the pin member is made of metal, resin, or the like, and the transparency or opacity of the material is irrelevant.

[0044] The base end portion 17 of the pin member is formed as a hollow cylindrical shape that penetrates both ends. The outer diameter of the base end portion 17 of the pin member is approximately the same as the maximum outer diameter of the tip portion 16 of the pin member, and is formed so that there is no step in the outer diameter between the base end portion 17 of the pin member and the tip portion 16 of the pin member.

[0045] The tip portion 16 of the pin member has a camera insertion hole 11 and an air vent hole 15 formed therein. The open ends of the camera insertion hole 11 and the air vent hole 15 on the tunnel side are both provided facing the hollow interior of the base portion 17 of the pin member. As shown in Figure 5(A), the edge of the camera insertion hole 11 facing the hollow interior of the base portion 17 of the pin member is provided with a chamfered portion 16a, which is chamfered to facilitate insertion of the camera 12 from the base portion 17 side of the pin member.

[0046] The pin member tip 16 is provided on the portion of the outer cylinder member 13 that protrudes from the end of the outer cylinder member 13 on the concrete pouring space 5 side, when the outer cylinder member 13 is fitted onto the pin member 10. In other words, the pin member tip 16 is provided in the section of the outer cylinder member 13 that protrudes from the end of the outer cylinder member 13 in the axial direction of the pin member 10, and the pin member base end 17 is provided in the section into which the outer cylinder member 13 is fitted and the section further inward towards the tunnel interior. Since the transparent pin member tip 16 is provided on the portion of the outer cylinder member 13 that protrudes from the end of the outer cylinder member 13, a camera 12 can be inserted into the camera insertion hole 11 provided inside, and the inside of the concrete pouring space 5 can be observed with this camera 12.

[0047] As shown in Figure 6, the outer cylindrical member 13 is formed in the shape of a hollow cylinder with open ends. Inside the outer cylindrical member 13, the pin member 10 is inserted from the opening on the tunnel interior side, and the tip of the pin member 10 is positioned to protrude from the opening on the ground side wall 4.

[0048] Furthermore, as shown in Figure 3, the outer cylindrical member 13 is fitted inside the cylindrical guide member 14 fixed to the formwork 3 with the pin member 10 inserted inside, and is supported by the guide member 14 with its tip protruding into the concrete pouring space 5.

[0049] To fix the pin member 10 to the outer cylinder member 13, as shown in Figure 3, a plurality of screw holes 13a, 13a... that penetrate to the interior are provided at circumferential intervals on the outer circumferential surface of the portion of the outer cylinder member 13 that protrudes into the tunnel from the guide member 14, and the fixing can be done by screwing a fixing bolt such as a hexagonal bolt or an eye bolt into these screw holes 13a and pressing the pin member 10, which is fitted inside, with the tip of the fixing bolt.

[0050] Furthermore, to fix the outer cylinder member 13 to the guide member 14, as shown in Figure 3, a plurality of screw holes 14a, 14a... are provided on the outer circumferential surface of the guide member 14, spaced apart in the circumferential direction and penetrating to the interior. Fixing bolts such as hexagonal bolts or eye bolts are screwed into these screw holes 14a, and the outer cylinder member 13 fitted inside is pressed with the tip of the fixing bolt.

[0051] The outer cylindrical member 13 is formed such that the outer diameter of the portion protruding into the concrete pouring space 5 gradually decreases towards the tip. As shown in the illustrated example, when the outer cylindrical member 13 is formed as a cylindrical shape with a circular cross-section, the outer diameter of the portion protruding into the concrete pouring space 5 gradually decreases towards the tip. The outer diameter on the tunnel interior side can be formed to be approximately the same. The inner diameter of the outer cylindrical member 13 is also approximately the same along its entire length. Because the outer diameter of the portion of the outer cylindrical member 13 protruding into the concrete pouring space 5 gradually decreases towards the tip, the outer cylindrical member 13 can be easily removed after construction.

[0052] The guide member 14 is a cylindrical member positioned so as to be approximately perpendicular in its axial direction to the outer surface of the formwork 3 on the tunnel interior side, and is positioned so as to communicate with the opening 3a provided in the formwork 3 and the cylindrical interior portion. The opening 3a provided in the formwork 3 is closed by a cover to prevent concrete poured into the concrete pouring space 5 from leaking out when the pin member 10 is not inserted, and the cover is removed only when inserting the pin member 10, and the pin member 10 is inserted into the guide member 14. The guide member 14 is provided so as to protrude from the formwork 3 on the tunnel interior side, and is positioned so as not to protrude into the concrete pouring space 5.

[0053] The outer cylinder member 13 and guide member 14 described above can be the same members used in conventional inspection pins. Therefore, the construction status confirmation device 1 of the present invention can be formed simply by changing the pin member 10 from that of a conventional inspection pin, and the construction status of the lining concrete can be confirmed without making significant design changes from a conventional inspection pin. [Explanation of Symbols]

[0054] 1...Construction status confirmation device, 2...Centering, 3...Formwork, 4...Ground side wall, 5...Concrete pouring space, 10...Pin member, 11...Camera insertion hole, 12...Camera, 13...Outer cylinder member, 14...Guide member, 15...Air vent hole, 16...Pin member tip, 17...Pin member base

Claims

1. A device for confirming the construction status of lining concrete, which is filled into the concrete pouring space between the formwork and the natural ground wall, A pin member is provided that is inserted into the concrete pouring space from the formwork side toward the ground-side wall surface, and at least the tip of the pin member is made of a transparent material, and a camera insertion hole is provided inside the pin member for inserting a camera that extends toward the tip. A device for confirming the construction status of concrete lining, characterized in that, when concrete lining is poured, the camera is inserted into the camera insertion hole, allowing for real-time observation of the construction status of the concrete lining being poured into the concrete pouring space.

2. The device for checking the construction status of lining concrete according to claim 1, wherein the pin member is fitted inside a cylindrical outer cylinder member and supported in a state protruding from the tip of the outer cylinder member, and the outer cylinder member is fitted inside a cylindrical guide member fixed to the formwork and supported in a state protruding into the concrete pouring space.

3. The device for checking the construction status of lining concrete according to claim 2, wherein the pin member is formed such that the outer shape of the portion protruding from the tip of the outer cylinder member gradually decreases in size towards the tip.

4. The device for checking the construction status of lining concrete according to claim 2, wherein the outer cylindrical member is formed such that the outer shape of the portion protruding into the concrete pouring space gradually becomes smaller towards the tip.

5. The device for checking the construction status of lining concrete according to claim 1, wherein the pin member is formed of a transparent material over its entire length.

6. The device for checking the construction status of lining concrete according to claim 1, wherein the pin member comprises a tip portion of the pin member formed of a transparent material and a hollow cylindrical base portion of the pin member.

7. The device for confirming the construction status of lining concrete according to claim 1, wherein the camera is an omnidirectional camera.

8. The device for checking the construction status of lining concrete according to claim 1, wherein an air vent hole is provided inside the pin member, the tip portion passing through to the outside of the formwork.

Images