Grout injection pipe having a ground interlocking element, and method for manufacturing the same.

Abstract

To provide a grout injection pipe having a ground interlocking mechanism that makes it easy to determine the amount of settlement even in ground with a large amount of settlement. [Solution] The grout injection pipe 1 having a ground interlocking body comprises a cylindrical body 10, a ground interlocking body 20 that moves in conjunction with ground movement, and a water-stopping body 30. The ground interlocking body 20 includes a penetration rod 22 that penetrates the ground, a measuring rod 23 that is inserted into the inside of the cylindrical body 10, a base plate 21 that is opposite the lower end of the cylindrical body 10 and is attached so that the penetration rod 22 protrudes downward and the measuring rod 23 protrudes upward, and a sway-stopping part 24 provided on the measuring rod 23 and having an extension portion 24b that extends radially toward the inner circumferential surface of the cylindrical body 10. The sway-stopping part 24 contacts the inner circumferential surface of the cylindrical body 10, thereby allowing the measuring rod 23 to stand upright in a constant position inside the cylindrical body 10.

Description

Technical Field

[0001] The present invention relates to a grout injection pipe having a ground interlocking body and a method for manufacturing the same.

Background Art

[0002] An apparatus for observing cavities formed between sluice gates, underground structures, etc. and the ground, and injecting grout for repair when a cavity is observed (for example, Patent Document 1) is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Patent Document 1 discloses a grout injection pipe in which the part for detecting ground subsidence and the part for injecting grout are separated. For this reason, the part for detecting ground subsidence tends to be narrow, and there is a problem that it is difficult to measure the subsidence amount when the subsidence amount increases.

[0005] The present invention has been made in view of such problems, and an object of the present invention is to provide a grout injection pipe having a ground interlocking body that allows easy grasping of the subsidence amount even for ground with a large subsidence amount.

Means for Solving the Problems

[0006] To achieve the above objective, the grout injection pipe having a ground interlocking body of the present invention comprises: a cylindrical body embedded in the bottom slab of a structure provided on the ground so as to penetrate the bottom slab vertically; a ground interlocking body that moves vertically relative to the cylindrical body in conjunction with ground movement; and a water-stopping body interposed between the cylindrical body and the ground interlocking body to allow grout injected into the cylindrical body to pass downward and to prevent water from entering the inside of the cylindrical body from below. The ground interlocking body has a penetration portion that penetrates the ground; a measuring portion inserted into the inside of the cylindrical body; a base plate facing the lower end of the cylindrical body, attached so as to cause the penetration portion to protrude downward and the measuring portion to protrude upward; and a sway-stopping portion provided on the measuring portion and having an extension portion that extends radially toward the inner circumferential surface of the cylindrical body. The sway-stopping portion contacts the inner circumferential surface of the cylindrical body, thereby allowing the measuring portion to stand upright in a certain position inside the cylindrical body.

[0007] The measuring unit may have an enlarged portion at its upper end, which increases the area of ​​the upper end surface.

[0008] The enlarged portion may be attached to the tip of the measuring unit body of the measuring unit.

[0009] The vibration damping portion has a central portion through which the measuring portion passes, and a plurality of extension portions extending radially from the central portion, and the central portion of the vibration damping portion may be fastened to the measuring portion via fastening components.

[0010] A nut portion may be welded to the outer surface of the cylindrical body, which is combined with a fixing bolt for securing the cylindrical body during construction.

[0011] The cylindrical body is formed by joining an upper cylindrical body that forms the upper part of the cylindrical body and a lower cylindrical body that forms the lower part in the vertical direction, and when the grout injection pipe is in its initial state, the joining position of the upper cylindrical body and the lower cylindrical body may be lower than the mounting position of the vibration-preventing part.

[0012] To achieve the above objective, the present invention provides a method for manufacturing a grout injection pipe having a ground interlocking body, comprising the steps of: attaching the penetration portion and the measurement portion to the base plate; attaching the water-stopping body to the inner circumferential surface of the lower cylindrical body; placing the lower cylindrical body on the base plate so that the measurement portion is inserted into the lower cylindrical body and a portion of it protrudes from the lower cylindrical body; attaching the vibration-stopping portion to the portion of the measurement portion that protrudes from the lower cylindrical body; and, after attaching the vibration-stopping portion to the measurement portion, joining the lower cylindrical body and the upper cylindrical body to form the cylindrical body. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a grout injection pipe having a ground interlocking body that makes it easy to grasp the amount of settlement even in ground with a large amount of settlement. [Brief explanation of the drawing]

[0014] [Figure 1] This is a cross-sectional view of a grout injection pipe having a ground interlocking body according to Embodiment 1 of the present invention. [Figure 2] This is a cross-sectional view of a grout injection pipe with a ground interlocking body, cut along the cross-sectional line II-II in Figure 1. [Figure 3] This is a cross-sectional view of a grout injection pipe with a ground interlocking body, cut along the cross-sectional line III-III in Figure 1. [Figure 4] This is a cross-sectional view showing the installation of a grout injection pipe having a ground interlocking body according to Embodiment 1 of the present invention. [Figure 5] This is a cross-sectional view showing the installation of a grout injection pipe having a ground interlocking body according to Embodiment 1 of the present invention, where (a) is a cross-sectional view in the initial state and (b) is a cross-sectional view in the state where the ground has subsided. [Figure 6]This is a cross-sectional view showing a state in which a grout injection pipe having a ground interlocking body according to Embodiment 1 of the present invention is installed, where (a) is a cross-sectional view showing a state of measuring the settlement amount of the settled ground, and (b) is a cross-sectional view showing a state of injecting grout into a cavity formed by ground settlement. [Figure 7] This is a cross-sectional view showing a state of manufacturing the grout injection pipe having the ground interlocking body according to Embodiment 1 of the present invention in the order of steps ((a) to (c)). [Figure 8] This is a manufacturing step continuing from Figure 7, and is a cross-sectional view showing a state of manufacturing the grout injection pipe having the ground interlocking body according to Embodiment 1 of the present invention in the order of steps ((a) to (b)). [Figure 9] This is a cross-sectional view of a grout injection pipe having a ground interlocking body according to Embodiment 2 of the present invention. [Figure 10] This is a cross-sectional view showing a state of assembling the grout injection pipe having the ground interlocking body according to Embodiment 2 of the present invention. [Figure 11] This is a cross-sectional view of a grout injection pipe having a ground interlocking body according to Embodiment 3 of the present invention. [Figure 12] This is a cross-sectional view focusing on the lower part of the grout injection pipe having the ground interlocking body according to Embodiment 4 of the present invention. [Figure 13] This is a cross-sectional view focusing on the lower part of the grout injection pipe having the ground interlocking body according to Embodiment 5 of the present invention. [Figure 14] This is a cross-sectional view focusing on the lower part of the grout injection pipe having the ground interlocking body according to Embodiment 6 of the present invention. [Modes for Carrying Out the Invention]

[0015] (Embodiment 1) Hereinafter, a grout injection pipe having a ground interlocking body according to Embodiment 1 of the present invention (hereinafter referred to as grout injection pipe 1) will be described with reference to the drawings. As shown in Fig.5(a), the grout injection pipe 1 is embedded, for example, in the bottom slab 200 of a structure provided on the ground 100. As shown in Fig.4, the bottom slab 200 of the structure includes leveling concrete 206, and a bottom slab 205 of a box culvert which is provided on the leveling concrete 206 and forms a water channel, a drainage channel or the like. The grout injection pipe 1 is a device that enables measurement of the settlement amount of the settled ground 100, and is used for injecting grout into a cavity formed below the bottom slab 200 due to the settlement of the ground 100. As shown in Fig.1, the grout injection pipe 1 includes a tubular body 10 embedded in the bottom slab 200 (Fig.5(a)), a ground interlocking body 20 that moves up and down relative to the tubular body 10 by interlocking with the deformation of the ground 100, and a water stop body 30 provided at the lower part of the tubular body 10.

[0016] The tubular body 10 is a metal circular pipe, and as shown in Fig.5(a), it is embedded so as to penetrate the bottom slab 200 vertically. As shown in Fig.1, the tubular body 10 has an upper tubular body 11, and a lower tubular body 12 connected to the lower part of the upper tubular body 11 by welding at a connection position 15. A female thread 13 is machined on the upper portion of the inner peripheral surface of the upper tubular body 11. This female thread 13 is combined with a male thread 42 formed on an upper lid 40 to be described later, so that the upper lid 40 is detachable at the upper end of the tubular body 10.

[0017] The ground interlocking body 20 has a base plate 21, a penetration rod 22 as a penetration part protruding downward from the lower surface of the base plate 21, a measurement rod 23 as a measurement part protruding upward from the upper surface of the base plate 21, and an anti-sway part 24 provided on the measurement rod 23.

[0018] As shown in Figure 2, the base plate 21 is a disc, and its diameter is larger than the diameter of the cylindrical body 10. As shown in Figure 1, when the grout injection pipe 1 is in its initial state, the upper surface of the base plate 21 is in contact with the lower end of the cylindrical body 10. Here, the initial state of the grout injection pipe 1 refers to the state when the grout injection pipe 1 is installed in the ground 100 (Figure 5(a)), and also the state of the grout injection pipe 1 when no settlement has occurred in the ground 100.

[0019] As shown in Figure 2, four penetration rods 22 are arranged at equal angular intervals with respect to the center of the base plate 21. The penetration rods 22 are welded to the underside of the base plate 21 and are driven into the ground 100. This creates friction between the circumferential surface of the penetration rods 22 and the ground 100. Once driven into the ground 100, the penetration rods 22 move in conjunction with the movement of the ground 100, causing the ground interlocking body 20 to move downward as the ground 100 settles.

[0020] As shown in Figure 2, the measuring rod 23 is positioned in the center of the base plate 21. The measuring rod 23 is positioned upright on the upper surface of the base plate 21, with its lower end welded to the upper surface of the base plate 21. As shown in Figure 1, the measuring rod 23 is shorter than the cylindrical body 10, but has a length that extends from the lower end of the cylindrical body 10 to the upper part of the cylindrical body 10, and passes through the inside of the cylindrical body 10. The measuring rod 23 has a metal measuring rod body 25 and an enlarged portion 26 attached to the upper end of the measuring rod body 25. The enlarged portion 26 is made of synthetic resin and is a cylindrical member that enlarges the area of ​​the upper end surface of the measuring rod 23. That is, the diameter of the enlarged portion 26 is larger than the diameter of the measuring rod 23. A fitting hole 26a is formed on the lower surface of the enlarged portion 26 into which the upper part of the measuring rod body 25 is fitted. In addition, a screw hole 41a is formed on the upper surface of the enlarged portion 26 for screwing in a bolt 41 for connecting to the upper cover 40, which will be described later. Furthermore, as shown in Figure 3, the measuring rod body 25 and the enlarged portion 26, which are fitted into the fitting hole 26a, have through holes 25b and 26b that overlap each other when viewed from the side (when viewed from the horizontal direction). Spring pins 27 are inserted into these through holes 25b and 26b, and the measuring rod body 25 and the enlarged portion 26 are connected via these spring pins 27.

[0021] As shown in Figure 2, the vibration-retaining portion 24 is attached to the measuring rod body 25 by a bolt 28 as a fastening component. The fastening component is not limited to a bolt; known components such as spring pins and rivets can be used. The vibration-retaining portion 24 has a cylindrical central portion 24a through which the measuring rod body 25 is inserted, and four extensions 24b that extend radially from the central portion 24a toward the inner circumferential surface of the cylindrical body 10. The bolt 28 is passed through a bolt insertion hole 28a formed in the central portion 24a and screwed into a female thread 25a formed in the measuring rod body 25. In this way, the vibration-retaining portion 24 is attached to the measuring rod body 25. The mounting position of the vibration-retaining portion 24 is above the center of the measuring rod 23 in the vertical direction, as shown in Figure 1, and above the joint position 15 between the upper cylindrical body 11 and the lower cylindrical body 12. The extension portion 24b is a substantially rectangular plate having chamfered portions 24c at its corners. The extension portion 24b is welded to the central portion 24a with one short side in a position where the short side is parallel to the vertical direction and the long side is parallel to the radial direction of the cylindrical body 10. A gap is formed between the tip of the extension portion 24b and the inner circumferential surface of the cylindrical body 10, such that the measuring rod 23 does not rattle. This allows the anti-vibration portion 24 to provide both vertical guidance for the measuring rod 23 and to prevent the measuring rod 23 from vibrating.

[0022] The water-stopping body 30 prevents soil and water from entering the grout injection pipe 1 and allows the grout injected into the grout injection pipe 1 to pass below the water-stopping body 30. The water-stopping body 30 has a mounting plate 31 welded to the inner circumference of a cylindrical body 10, a sealing rubber 32 to prevent soil and water from entering, a retaining plate 33 to press the sealing rubber 32 against the mounting plate 31, and mounting bolts 34 to attach the sealing rubber 32 to the mounting plate 31.

[0023] As shown in Figure 2, the mounting plate 31 has a disc-shaped portion 31a whose center coincides with the center of the cylindrical body 10, and four protrusions 31b that project radially outward from the outer circumferential surface of the disc-shaped portion 31a. As shown in Figure 1, a through hole 31c for passing the measuring rod body 25 is formed in the center of the disc-shaped portion 31a. In addition, screw holes 31d for screwing in mounting bolts 34 are formed in the disc-shaped portion 31a at equal angular intervals with respect to the center of the disc-shaped portion 31a. The protrusions 31b are arranged at equal angular intervals with respect to the center of the disc-shaped portion 31a, and their tips are joined to the inner circumferential surface of the cylindrical body 10 by welding. In this way, the mounting plate 31 is fixed inside the cylindrical body 10. Note that a gap is formed between the inner circumferential surface of the cylindrical body 10 and the outer circumferential surface of the disc-shaped portion 31a between adjacent protrusions 31b in the circumferential direction of the disc-shaped portion 31a. This gap functions as a grout opening 35 through which the injected grout passes.

[0024] As shown in Figure 1, the sealing rubber 32 is attached to the lower surface of the mounting plate 31. The sealing rubber 32 has a through hole 32a in the center for passing the measuring rod body 25 through, and when viewed from above, it has a ring shape with the through hole 32a in the center. The sealing rubber 32 adheres tightly to the inner surface of the cylindrical body 10 with its outer edge 32b which is inclined downward outward, and adheres tightly to the surface of the measuring rod body 25 with its inner edge 32c which is inclined downward inward. As a result, when soil or water tries to enter the grout injection pipe 1, a force acts on the outer edge 32b to adhere tightly to the inner surface of the cylindrical body 10, and a force acts on the inner edge 32c to adhere tightly to the surface of the measuring rod body 25. This prevents soil or water from entering the grout injection pipe 1. On the other hand, the grout injected into the cylindrical body 10 passes through the grout opening 35 (Figure 2) and pushes the outer edge 32b downward. This creates a gap between the outer edge 32b and the inner surface of the cylindrical body 10, allowing grout to be injected below the water-stopping body 30.

[0025] The retaining plate 33 is a ring-shaped member, and a bolt insertion hole 33a is formed at a position corresponding to the screw hole 31d of the mounting plate 31. When the mounting bolt 34 passed through the bolt insertion hole 33a is combined with the screw hole 31d, the retaining plate 33 presses the sealing rubber 32 against the mounting plate 31.

[0026] Furthermore, the grout injection pipe 1 includes a removable top cover 40 attached to the upper end of the cylindrical body 10, a nut portion 50 attached to the outer surface of the cylindrical body 10, and a watertight rubber sheet 60 attached to the outer surface of the cylindrical body 10.

[0027] The top cover 40 is made of synthetic resin and has a circular shape when viewed from above. A male thread 42 is formed on the outer surface of the top cover 40, which is combined with a female thread 13 formed on the cylindrical body 10. This makes the top cover 40 detachable from the top of the cylindrical body 10. Also, a bolt hole 43 for passing a bolt 41 is formed in the center of the top cover 40 when viewed from above. By screwing the bolt 41 through the bolt hole 43 into the threaded hole 41a formed in the enlarged section 26, the top cover 40 and the ground interlocking body 20 can be connected. This eliminates the need to move the ground interlocking body 20 up and down relative to the cylindrical body 10, allowing the grout injection pipe 1 to be handled as a single unit during transport and installation.

[0028] The nut portion 50 is attached to the upper part of the outer surface of the cylindrical body 10. The nut portion 50 is, for example, a tall nut. As shown in Figure 3, two nut portions 50 are provided at equal angles of 180 degrees with respect to the center of the cylindrical body 10. The nut portions 50 are used to fix the grout injection pipe 1 to the structure, as will be described later.

[0029] As shown in Figure 1, the water-sealing rubber sheet 60 is wrapped around the outer surface of the cylindrical body 10 at two different height positions. The water-sealing rubber sheet 60 adheres to the surrounding mortar and provides water-sealing properties. While a butyl rubber sheet is one example of the water-sealing rubber sheet 60, it is not limited to this, and any rubber sheet that provides water-sealing properties can be used.

[0030] Next, the method for installing the grout injection pipe 1 will be described. As shown in Figure 4, the grout injection pipe 1 is installed in the cavity 230 of the base slab 200 of the structure installed on the ground 100. To install the grout injection pipe 1, first, a circular frame (not shown) is installed in the ground 100 at the location where the grout injection pipe 1 will be installed, and leveling concrete 206 is poured. Then, by removing the frame (not shown), a cavity 232 for installing the grout injection pipe 1 is formed in the leveling concrete 206. Subsequently, the box culvert with the cavity 231 is placed on the ground 100 so that the cavity 232 and cavity 231 overlap, forming a continuous cavity 230. Then, the grout injection pipe 1 is inserted into the cavity 230, and a penetration rod 22 is driven into the ground 100 to complete the temporary placement of the grout injection pipe 1. At this time, various dimensions are determined so that the upper end of the grout injection pipe 1 coincides with the upper surface of the base plate 200.

[0031] Next, the wooden block 70, which has bolt holes 71 formed therein, is placed parallel to the upper surface of the base plate 200, and the bolts 72 inserted into the bolt holes 71 are tightened into the nuts 50 to connect the wooden block 70 to the grout injection pipe 1. This allows the grout injection pipe 1 to be fixed within the cavity 230. Then, mortar is poured around the grout injection pipe 1. At this time, the watertight rubber sheet 60 reacts as the mortar hardens and adheres to the mortar. After the mortar hardens, the bolts 72 and wooden block 70 are removed, and the bolt 41 that connected the top cover 40 and the enlarged section 26 is removed, making the ground interlocking body 20 movable up and down relative to the cylindrical body 10. After the bolt 41 is removed, a plug 73 (Figure 5(a)) is inserted into the bolt hole 43 to seal the bolt hole 43. This allows the grout injection pipe 1 to be installed on the base plate 200, as shown in Figure 5(a). In Figure 5(a), the box culvert base slab, leveling concrete, and mortar injected around the grout injection pipe 1 are all shown together as the base slab 200 of the structure without distinction. Thus, the base slab 200 of the structure in this embodiment includes the leveling concrete 206 and the mortar injected around the grout injection pipe 1.

[0032] Assume that the grout injection pipe 1, starting from its initial state as shown in Figure 5(a), has a cavity 90 formed as the ground 100 directly beneath the base slab 200 settles, as shown in Figure 5(b). The ground interlocking body 20 follows the settlement of the ground 100 and moves downward relative to the cylindrical body 10. Therefore, the amount of downward movement of the ground interlocking body 20 is equal to the amount of settlement of the ground 100.

[0033] To measure the settlement of the ground 100, remove the top cover 40 shown in Figure 5(b), and insert the scale 80 into the cylindrical body 10 from above, as shown in Figure 6(a). Then, place the tip of the scale 80 against the upper surface of the magnification section 26 and read the scale at, for example, the upper end position of the cylindrical body 10, which is the reading position. The reading position can be any height as long as it is consistent. In this way, the settlement of the ground 100 is calculated from the measured value and the initial value in the initial state.

[0034] When filling a cavity 90 formed directly beneath the base slab 200 with grout, the volume of the cavity 90 is calculated from the measured settlement amount, and the amount of grout material is measured. The measured grout material is put into a grout injection machine (not shown) and injected into the cylindrical body 10 through the injection nozzle 85 of the grout injection machine, which is inserted into the cylindrical body 10. As shown in Figure 6(b), the injected grout pushes open the sealing rubber 32 and fills the cavity 90 directly beneath the base slab 200. The grout injection work is completed when all of the measured grout has been injected.

[0035] Next, the manufacturing method of the grout injection pipe 1 will be described. The following description will focus on the case where the grout injection pipe 1 is assembled in a vertical orientation, but it may also be assembled in a horizontal orientation. First, as shown in Figure 7(a), the penetration rod 22 and the measuring rod body 25 are attached to the base plate 21, and the water-stopping body 30 is attached to the lower part of the lower cylindrical body 12, which is the lower part of the cylindrical body 10. Then, the lower cylindrical body 12 is brought closer to the base plate 21 from above, and the measuring rod body 25 is inserted into the center of the water-stopping body 30 from below, so that the lower cylindrical body 12 is placed on the upper surface of the base plate 21, as shown in Figure 7(b). The length of the measuring rod body 25 is longer than the length of the lower cylindrical body 12 in the vertical direction. Therefore, when the lower cylindrical body 12 is placed on the base plate 21, the measuring rod body 25 protrudes above the upper end of the lower cylindrical body 12. Then, the bracing part 24 and the expanding part 26 are attached to the portion of the measuring rod body 25 that protrudes beyond the upper end of the lower cylindrical body 12. The area around the mounting positions of the bracing part 24 and the expanding part 26 is widely open, which facilitates the installation work. In this way, the ground interlocking unit 20 can be assembled.

[0036] Next, as shown in Figure 7(c), the upper cylindrical body 11, which has an internal thread 13 formed at its upper end, is brought closer to the lower cylindrical body 12 from above. At this time, the vibration-retaining portion 24 is housed inside the upper cylindrical body 11, and its outer edge (the tip of the extension portion 24b shown in Figure 1) comes into contact with the inner circumferential surface of the upper cylindrical body 11. As a result, the posture of the upper cylindrical body 11 is stabilized without vibration, and the vibration-retaining portion 24 can function as a guide until the upper cylindrical body 11 comes into contact with the lower cylindrical body 12. As shown in Figure 1, the extension portion 24b of the vibration-retaining portion 24 has a chamfered portion 24c, and the upper cylindrical body 11 is guided by the chamfered portion 24c. This allows the vibration-retaining portion 24 to be smoothly housed inside the upper cylindrical body 11. Then, as shown in Figure 8(a), the ends of the joined upper cylindrical body 11 and lower cylindrical body 12 are welded together using a welding machine 95 to integrate the cylindrical body 10. Then, as shown in Figure 8(b), the nut portion 50 and the watertight rubber sheet 60 are attached to the outer surface of the cylindrical body 10, and the top cover 40 is attached to the upper end of the cylindrical body 10. The grout injection pipe 1 can be manufactured through these steps.

[0037] This invention is not limited to the above embodiments and can be modified and applied in various ways. In the above embodiments, the measuring rod 23 was described as being attached to the base plate 21 by welding. However, the attachment of the measuring rod 23 to the base plate 21 is not limited to welding. Hereinafter, Embodiment 2 will be described as a method of fixing the measuring rod with nuts, but since there are many components in common with Embodiment 1, the same reference numerals will be used for the common components, and the description of the common components will be omitted.

[0038] (Embodiment 2) In the grout injection pipe 101 according to Embodiment 2, as shown in Figure 9, a nut 130 is tightened to a measuring rod body 125 inserted through a base plate 121. A measuring rod insertion hole 121a is formed in the center of the base plate 121 through which the measuring rod body 125 passes. A male thread 125a is formed at the lower end of the measuring rod body 125, and a nut 130 is tightened to this male thread 125a from below, with a washer 131 interposed between it and the base plate 121. As a result, when the ground 100 (Figure 4) sinks, the measuring rod body 125 is pulled downward and moves downward relative to the cylindrical body 110. In Embodiment 1, as shown in Figure 8(a), the cylindrical body 10 was formed by welding together two separate upper cylindrical body 11 and lower cylindrical body 12, but the cylindrical body 110 in this embodiment has an integrated structure without a joint.

[0039] As shown in Figure 10, the grout injection pipe 101 is assembled by attaching the penetration rod 22 to the base plate 121, and attaching the watertight body 30, nut portion 50, and watertight rubber sheet 60 to the cylindrical body 110. In addition, the vibration-damping portion 24 and the expansion portion 26 are attached to the measuring rod body 125 before passing the measuring rod body 125 through the cylindrical body 110. In this way, the attachment of the vibration-damping portion 24 and the expansion portion 26 can be performed in a different location from the assembly location of the grout injection pipe 1, thus securing workspace and making the attachment work easier. After placing the cylindrical body 110 on the base plate 121, the measuring rod body 125 is inserted from above the cylindrical body 110, passing through the watertight body 30 and the base plate 121. At this time as well, the tip of the vibration-damping portion 24 slides along the inner surface of the cylindrical body 110, allowing the measuring rod body 125 to be guided downward without rattling. Furthermore, the chamfered portion 24c of the extension portion 24b facilitates the insertion of the vibration-preventing portion 24 into the cylindrical body 110. Then, a washer 131 is passed over the male thread 125a of the measuring rod body 125 that protrudes downward from the base plate 121, and a nut 130 is tightened. Finally, as shown in Figure 9, the top cover 40 is attached to the upper end of the cylindrical body 110, and the top cover 40 and the enlarged portion 26 are connected via a bolt 41. The grout injection pipe 101 can be manufactured through these steps. In this embodiment, the cylindrical body 110 has been described as a single unit without joints such as welding, but it is not limited to this, and multiple cylindrical bodies may be connected by welding, as in Embodiment 1.

[0040] (Embodiment 3) Next, the grout injection pipe 201 according to Embodiment 3 will be described with reference to Figure 11. In Embodiment 1, the joint of the cylindrical body 10 was described as being a welded joint, but it is not limited to this. For example, a flange 211a may be formed at the lower end of the upper cylindrical body 211, and a flange 212a may be formed at the upper end of the lower cylindrical body 212, and the overlapping flanges 211a and 212a may be joined with bolts 220. The position where the bolts are joined is lower than the mounting position of the bracing part 24, as in Embodiment 1. Furthermore, the assembly method of the grout injection pipe 201 is basically the same as the assembly method of the grout injection pipe 1 in Embodiment 1. The difference is that instead of joining by welding as shown in Figure 8(a), it is joined with bolts 220. This makes it possible to obtain the same effects as in Embodiment 1.

[0041] (Embodiment 4) Next, the grout injection pipe 301 according to Embodiment 4 will be described with reference to Figure 12. In Embodiment 1, it was described that the penetration rod 22 is welded to the lower surface of the base plate 21, but the method of attaching the penetration rod is not limited to welding, and in the following embodiments, a form in which the penetration rod is attached by fastening means such as screws will be described.

[0042] A countersunk hole 324 is formed in the base plate 321 of the grout injection pipe 301. The penetration rod 322 in this embodiment is a so-called long-type high nut. The penetration rod 322 is placed against the lower surface of the base plate 321, and the base plate 321 and the penetration rod 322 are tightened with a countersunk screw 323 inserted into the countersunk hole 324. This attaches the penetration rod 322 to the base plate 321. With this configuration, the length of the penetration rod 322 that penetrates the ground can be appropriately changed by changing the length of the high nut attached to the base plate 321, thus allowing for flexible adaptation to site conditions. In addition, because a countersunk hole 324 is formed, the countersunk screw 323 does not protrude from the upper surface of the base plate 321. Note that the screw used to attach the penetration rod 322 is not limited to a countersunk screw 323, but a truss screw or a round-head screw may also be used.

[0043] (Embodiment 5) Next, the grout injection pipe 401 according to Embodiment 5 will be described with reference to Figure 13. The base plate 321 is the same as the base plate 321 of Embodiment 4. On the other hand, a tall nut 423 is attached to the lower surface of the base plate 321 via a countersunk screw 323. This tall nut 423 is shorter than the tall nut of Embodiment 4. A hexagonal bolt 422 is attached to this tall nut 423. The tip of the hexagonal bolt 422 is screwed into the tall nut 423, and the bolt head side protrudes from the tall nut 423. In this embodiment, the tall nut 423 and the hexagonal bolt 422 act as a penetrating portion that penetrates into the ground. The length of the hexagonal bolt attached to the tall nut 423 is arbitrary, and a hexagonal bolt of an appropriate length is attached according to the required length of the penetrating portion to be penetrated into the ground. Note that the material attached to the tall nut 423 is not limited to a hexagonal bolt, but any threaded rod-shaped member may be used, for example, a round steel with a threaded tip. Furthermore, the screws used to attach the high nut 423 are not limited to countersunk screws 323; truss screws or round-head screws may also be used.

[0044] (Embodiment 6) Next, the grout injection pipe 501 according to Embodiment 6 will be described with reference to Figure 14. The base plate 421 has a threaded hole 424 with an internal thread formed therein. The penetration rod 522 is made of, for example, round steel and has an external thread 522a formed at its tip. The penetration rod 522 is attached to the base plate 421 by screwing the external thread 522a into the threaded hole 424. The length of the penetration rod 522 can be any length. Furthermore, the penetration rod 522 is not limited to round steel; any rod-shaped member with an external thread formed at its tip can be used. The material can also be any material. In addition, a bolt may be attached to the base plate 421 as the penetration part.

[0045] In the above embodiment, a nut portion 50 was attached to fix the grout injection pipe to a precast concrete box culvert. However, if the structure to be attached is a cast-in-place concrete structure, a rod-shaped member 250 may be attached so as to protrude laterally from the outer surface of the upper cylindrical body 211 (which may be the lower cylindrical body 212), as shown in Figure 11. The grout injection pipe 201 may be fixed with this rod-shaped member 250 and binding wire (not shown).

[0046] Furthermore, although the above embodiment described a box culvert as an example of a structure to which grout injection pipes are installed, the applicable structures are not limited to box culverts. For example, they may be installed in the foundations of bridge piers and abutments, tunnels, utility tunnels, and other structures.

[0047] Furthermore, although the explanation described the case where the structure has leveling concrete 206, it is not necessary for the structure to have leveling concrete 206.

[0048] Furthermore, to manufacture grout injection pipes 1 of different lengths according to the expected settlement amount, the length of the upper cylindrical bodies 11,211 can be kept constant, while lower cylindrical bodies 12,212 of different lengths can be prepared. This allows for mass production of upper cylindrical bodies 11,211 of the same length, thereby reducing manufacturing costs. In addition, if the length of the lower cylindrical body 12,212 is required, multiple cylindrical bodies may be connected to manufacture the lower cylindrical body 12,212.

[0049] Furthermore, the number, length, and arrangement of the penetration rods 22 can be appropriately set according to the conditions of the ground 100. Also, the penetration part is not limited to the rod-shaped penetration rods 22, but may be plate-shaped or pipe-shaped.

[0050] Furthermore, although the magnification section 26 was described as a cylindrical member made of synthetic resin attached to the upper end of the measuring rod body 25, the material and shape of the magnification section are arbitrary. Alternatively, the magnification section may be integrally formed with the upper part of the measuring rod body.

[0051] Furthermore, while welding and bolting have been described as methods for joining the upper and lower cylindrical bodies, other joining methods may also be used, such as mechanical joining such as fitting, riveting, or screw joining.

[0052] As described in detail above regarding the embodiments, the grout injection pipe 1 having a ground interlocking body according to the present invention comprises a cylindrical body 10 embedded in the bottom slab 200 of a structure provided on the ground 100 so as to penetrate the bottom slab 200 vertically, a ground interlocking body 20 that moves vertically relative to the cylindrical body 10 in conjunction with the movement of the ground 100, and a water-stopping body 30 interposed between the cylindrical body 10 and the ground interlocking body 20 to allow the grout injected into the cylindrical body 10 to pass downward and to prevent water from entering the inside of the cylindrical body 10 from below. The ground interlocking body 20 includes a penetration portion (e.g., a penetration rod 22) that penetrates the ground 100, a measuring portion (e.g., a measuring rod 23) that is inserted inside the cylindrical body 10, a base plate 21 that is attached opposite the lower end of the cylindrical body 10 and is mounted so that the penetration portion (e.g., a penetration rod 22) protrudes downward and the measuring portion (e.g., a measuring rod 23) protrudes upward, and a sway-preventing portion 24 provided on the measuring portion (e.g., a measuring rod 23) and having an extension portion 24b that extends radially toward the inner circumferential surface of the cylindrical body 10. The sway-preventing portion 24 contacts the inner circumferential surface of the cylindrical body 10, thereby allowing the measuring portion (e.g., a measuring rod 23) to stand upright in a certain position inside the cylindrical body 10.

[0053] As described above, since the bracing section 24 is provided on the measuring rod 23, which is part of the ground linkage body 20, the bracing section 24 moves downward together with the measuring rod 23 as the ground 100 settles. Therefore, a space for inserting the scale 80 is always provided above the measuring rod 23, making it easy to insert the scale 80 even when the amount of ground settlement of 100 is large, and thus easy to measure the amount of settlement. Specifically, when the top cover 40 is removed when the ground 100 has settled (as shown in Figure 5(b)), there is no obstruction above the measuring rod 23, making it easy to measure the amount of settlement. Furthermore, the ground linkage body 20 can follow the settlement of the ground 100 until the bracing section 24 hits the water-stopping body 30. That is, as shown in Figure 1, it is possible to measure the amount of settlement of the ground 100 corresponding to the length L1 between the lower end of the bracing section 24 and the upper end of the water-stopping body 30. By separating the positions of the bracing portion 24 and the water-stopping body 30, it is possible to measure large amounts of ground settlement 100. Furthermore, since the bracing portion 24 is provided on the measuring rod 23, even if ground settlement 100 occurs beyond what is expected, the bracing portion 24 can be caught on the water-stopping body 30, preventing the measuring rod 23 from falling out of the cylindrical body 10. This ensures that watertightness between the measuring rod 23 and the mounting plate 31 is maintained.

[0054] Furthermore, the measuring section (for example, the measuring rod 23) has an enlarged section 26 at its upper end, which increases the area of ​​the upper end surface.

[0055] With this configuration, it becomes easier to apply the tip of the scale 80 inserted into the cylindrical body 10 to the measuring rod 23, making it easier to measure the amount of settlement of the ground 100. In particular, even if the amount of settlement is large and the measuring rod 23 is in a deeply sunk position, it has the remarkable effect of making it easier to measure the amount of settlement. Furthermore, even if the settlement of the ground 100 exceeds expectations and the vibration-stopping part 24 that hits the water-stopping body 30 comes off the measuring part (for example, the measuring rod 23), the expanding part 26 can be hooked onto the water-stopping body 30. This prevents the measuring rod 23 from falling out of the cylindrical body 10 and ensures that the watertight seal between the measuring rod 23 and the mounting plate 31 is maintained.

[0056] Furthermore, the magnification section 26 is attached to the tip of the measuring section body (e.g., measuring rod body 25) of the measuring section (e.g., measuring rod 23).

[0057] With this configuration, the installation of the enlarged portion 26 is not affected by differences in the worker's skill level or equipment, making it easier to ensure consistent quality. Furthermore, no special processing is required to form the enlarged portion 26, which helps to reduce manufacturing costs.

[0058] Furthermore, the vibration-preventing section 24 has a central section 24a through which a measuring section (e.g., a measuring rod 23) passes, and a plurality of extension sections 24b extending radially from the central section 24a. The central section 24a of the vibration-preventing section 24 is fastened to the measuring section (e.g., a measuring rod 23) via fastening components (e.g., bolts 28).

[0059] With this configuration, the installation of the anti-vibration section 24 is not affected by differences in the worker's skill level or equipment, making it easier to ensure consistent quality. Furthermore, no special processing is required to form the anti-vibration section 24, which helps to reduce manufacturing costs.

[0060] Furthermore, a nut portion 50 is welded to the outer surface of the cylindrical body 10, which is combined with a fixing bolt 72 for securing the cylindrical body 10 during construction.

[0061] With this configuration, the grout injection pipe 1 can be bolted to the battens 70 installed on precast concrete structures such as box culverts. Therefore, the grout injection pipe 1 can be stabilized during construction, improving workability.

[0062] Furthermore, the cylindrical body 10 is formed by joining an upper cylindrical body 11, which forms the upper part of the cylindrical body 10, and a lower cylindrical body 12, which forms the lower part, in the vertical direction. When the grout injection pipe 1 is in its initial state, the joining position 15 between the upper cylindrical body 11 and the lower cylindrical body 12 is lower than the mounting position of the vibration damping part 24.

[0063] With this configuration, as shown in Figure 7(b), the mounting position of the anti-vibration part 24 can be made higher than the upper end of the lower cylindrical body 12 before the upper cylindrical body 11 is joined, thereby securing working space when installing the anti-vibration part 24. This improves workability. In addition, the anti-vibration part 24 provided on the measuring section (e.g., measuring rod 23) can function as a guide until the upper cylindrical body 11 comes into contact with the lower cylindrical body 12, thereby improving workability.

[0064] Furthermore, the method for manufacturing a grout injection pipe having the above-described ground interlocking body includes the steps of: attaching a penetration part (e.g., a penetration rod 22) and a measuring part (e.g., a measuring rod 23) to a base plate 21; attaching a water-stopping body 30 to the inner circumferential surface of the lower cylindrical body 12; placing the lower cylindrical body 12 on the base plate 21 so that the measuring part (e.g., a measuring rod 23) is inserted into the lower cylindrical body 12 and a portion of it protrudes from the lower cylindrical body 12; attaching a sway-stopping part 24 to the portion of the measuring part (e.g., a measuring rod 23) that protrudes from the lower cylindrical body 12; and, after attaching the sway-stopping part 24 to the measuring part (e.g., a measuring rod 23), joining the lower cylindrical body 12 and the upper cylindrical body 11 to form a cylindrical body 10.

[0065] With this configuration, the anti-sway portion 24 can be attached to the portion protruding from the lower cylindrical body 12, resulting in a larger workspace and improved workability. Furthermore, the anti-sway portion 24 provided on the measuring section (e.g., measuring rod 23) can function as a guide until the upper cylindrical body 11 comes into contact with the lower cylindrical body 12, thereby improving workability. [Explanation of Symbols]

[0066] 1…Grout injection pipe, 10…Cylindrical body, 11…Upper cylindrical body, 12…Lower cylindrical body, 13, 25a…Female thread, 15…Joint position, 20…Ground interlocking body, 21…Base plate, 22…Penetration rod, 23…Measuring rod, 24…Sway-preventing part, 24a…Center part, 24b…Extended part, 24c…Chamfered part, 25…Measuring rod body, 25b…Through hole, 26…Enlarged part, 26a…Matching hole, 26b…Through hole, 27…Spring pin, 28…Bolt, 28a…Bolt 30...Through hole, 31...Waterproofing body, 31...Mounting plate, 31a...Disc-shaped part, 31b...Protruding part, 31c...Through hole, 31d...Screw hole, 32...Sealing rubber, 32a...Through hole, 32b...Outer edge, 32c...Inner edge, 33...Pressing plate, 33a...Bolt insertion hole, 34...Mounting bolt, 35...Grout opening, 40...Top cover, 41...Bolt, 41a...Screw hole, 42...Male thread, 43...Bolt hole, 50...Nut part, 60...Waterproofing rubber sheet, 70...Wooden block, 71...Bolt hole, 72...Bolt, 73...Plug, 80...Scale, 85...Injection nozzle, 90...Cavity, 95...Welding machine, 100...Ground, 101...Grout injection pipe, 110...Cylindrical body, 121...Base plate, 121a...Measuring rod insertion hole, 125...Measuring rod body, 125a...Male screw, 130...Nut, 131...Washer, 200...Bottom plate, 201...Grout injection pipe, 205...Bottom plate, 206...Leveling concrete, 211...Upper cylindrical body, 211a...Flange, 212...Lower cylindrical body, 212a...Flange, 220...Bolt, 230, 231, 232...Cavity, 250...Rod-shaped member, 301...Grout injection pipe, 321...Base plate, 322...Penetration rod, 323...Countersunk screw, 324...Countersunk hole, 401...Grout injection pipe, 421...Base plate, 422...Hex bolt, 423...High nut, 424...Threaded hole, 501...Grout injection pipe, 522...Penetration rod, 522a...Male thread

Claims

1. A cylindrical body is embedded in the base plate of a structure built on the ground, so as to penetrate the base plate vertically, A ground interlocking body moves up and down relative to the cylindrical body in conjunction with ground movement, The system includes a water-stopping body interposed between the cylindrical body and the ground interlocking body, which allows the grout poured into the cylindrical body to pass downward and prevents water from entering the interior of the cylindrical body from below, The aforementioned ground interlocking body is The penetration portion that penetrates the ground, A measuring unit inserted into the inside of the cylindrical body, A base plate is attached opposite the lower end of the cylindrical body, with the penetration portion protruding downward and the measuring portion protruding upward; The measuring unit is provided with a vibration damping portion having an extension that extends radially toward the inner circumferential surface of the cylindrical body, The vibration-preventing portion contacts the inner circumferential surface of the cylindrical body, thereby allowing the measuring portion to stand upright in a fixed position inside the cylindrical body. A grout injection pipe with a ground interlocking mechanism.

2. The measuring unit has an enlarged portion at its upper end, which increases the area of ​​the upper end surface. A grout injection pipe having a ground interlocking body as described in claim 1.

3. The enlarged portion is attached to the tip of the measuring unit body of the measuring unit. A grout injection pipe having a ground interlocking body as described in claim 2.

4. The vibration damping portion has a central portion through which the measuring portion passes, and a plurality of extension portions extending radially from the central portion. The central portion of the vibration damping part is fastened to the measuring part via a fastening component. A grout injection pipe having a ground interlocking body as described in claim 1.

5. A nut portion, which is combined with a fixing bolt for securing the cylindrical body during construction, is welded to the outer surface of the cylindrical body. A grout injection pipe having a ground interlocking body as described in claim 1.

6. The cylindrical body is formed by joining an upper cylindrical body that forms the upper part of the cylindrical body and a lower cylindrical body that forms the lower part in the vertical direction. When the grout injection pipe is in its initial state, the joint position between the upper cylindrical body and the lower cylindrical body is lower than the mounting position of the vibration damper. A grout injection pipe having a ground interlocking body as described in claim 1.

7. A method for manufacturing a grout injection pipe having a ground interlocking body as described in claim 6, The steps include attaching the penetration portion and the measuring portion to the base plate, The steps include attaching the water-stopping body to the inner surface of the lower cylindrical body, The steps include: placing the lower cylindrical body on the base plate, inserting the measuring unit through the lower cylindrical body so that a portion of it protrudes from the lower cylindrical body; The steps include attaching the vibration damper to the portion of the measuring unit that protrudes from the lower cylindrical body, The process includes the step of attaching the vibration damping part to the measuring part, and then joining the lower cylindrical body and the upper cylindrical body to form the cylindrical body, A method for manufacturing a grout injection pipe having a ground interlocking element.

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