JP2006336235A - Manhole structure and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manhole structure constructible by assembling a plurality of concrete panels manufactured in a factory at a job site, capable of standardizing work, and capable of shortening a construction period. <P>SOLUTION: A joining tool 1 for joining the mutual concrete panels has a large diameter part 14a and a small diameter part 14b in a sleeve for arranging a plurality of sleeve divided pieces 6a in a substantially cylindrical shape, arranged in a sleeve storage part 5a of the concrete panel 2C so as to be expandable outward in the radial direction and so as not to slip out of a sleeve case, arranging an energizing member 6D on the outer periphery for energizing the respective sleeve divided pieces inward in the radial direction and arranging an engaging groove 6b on an inner peripheral surface. The large diameter part is arranged in a pin storage part 5a of the concrete panel 2A so as to be movable in the radial direction and so as not to slip out of a pin case. A pin provided with a projection strip 14c is pressed in a tip part of the small diameter part. The projection strip is engaged with an engaging groove. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a manhole structure attached for managing pipes in sewerage facilities and the like and a method for constructing the manhole structure.

  The manhole of the sewer system is composed of a rectangular box-shaped cylindrical portion (hereinafter referred to as “manhole structure”) extending upward from the underground sewer, and this manhole structure is constructed by constructing a concrete formwork in the field. It was common to construct by placing concrete. However, there is an increasing demand for shortening the construction period and earthquake resistance, and a construction method for assembling precast concrete parts that are preliminarily molded into a cylindrical shape or a box shape is being implemented. In this method, for example, a step of separately manufacturing and assembling components such as a box-shaped portion connected to the sewer, a cylindrical portion extending upward from the box-type portion, and a contact portion with the ground surface is adopted. In the case of a large manhole deep underground, the cylindrical portion is further divided into several cylindrical blocks.

  However, in the method of preparing and assembling such cylindrical or box-shaped precast element parts in advance, the element parts manufactured by precasting are three-dimensional, large in size, and heavy in weight. For handling, a large transport vehicle and heavy machinery are required, which increases the construction cost. Also, a large amount of space is required to stock the parts. In addition, there is a problem in that joint processing is necessary at the joints of the constituent elements when assembling, and the cost for that is increased. Furthermore, it is difficult to adjust the dimensions and shape according to the situation at the site.

  Therefore, while enjoying the advantages of easy installation and high strength by using precast parts, multiple concrete panels manufactured at the factory are aimed at reducing the cost of parts stock, transportation and handling. A construction method has been proposed in which concrete is assembled on site, concrete is placed on the edge thereof, and concrete panels are joined together (see, for example, Patent Document 1).

JP 2005-42376 A

  However, since the construction method described in Patent Document 1 involves a part-in-place operation of concrete even though it is partially, it is difficult to standardize the operation because a mold installation process and a curing process are required. The construction period cannot be shortened.

  The present invention has been made in view of such circumstances, and can be constructed by assembling a plurality of concrete panels manufactured in a factory on the site, and a manhole structure capable of standardizing work and shortening the work period and its The purpose is to provide a construction method.

In order to achieve the above object, the manhole structure according to claim 1 is a manhole structure in which concrete panels are joined to each other with a joint tool,
The connector is
A sleeve case provided on one concrete panel and opened to the joint surface side of the concrete panel;
A plurality of sleeve division pieces are arranged in a substantially cylindrical shape, and are provided in the sleeve accommodating portion of the sleeve case so as to be radially outwardly expandable and not removable from the sleeve case. A sleeve provided with an urging member for urging the sleeve split piece radially inward, and an engagement groove on the inner peripheral surface;
A pin case provided on the other concrete panel and opened to the joint surface side of the concrete panel;
A large-diameter portion and a small-diameter portion, wherein the pin-receiving portion of the pin case is provided with the large-diameter portion so as to be movable in a radial direction and not coming out of the pin case. A pin that protrudes from the joint surface of the concrete panel and is provided with a protrusion that can be engaged with the engagement groove of the sleeve at the tip of the small-diameter portion;
With
The small diameter portion of the pin is press-fitted into the sleeve, and the protrusion of the pin is engaged with the engagement groove of the sleeve.

  According to a second aspect of the present invention, there is provided the manhole structure according to the first aspect of the present invention, wherein the large-diameter portion of the sleeve and the pin is prevented from coming out to the opening side of the sleeve case and the pin case, respectively. A cylindrical lid is screwed together.

  The manhole structure according to claim 3 is the invention according to claim 1 or 2, wherein the sleeve case and the pin case are configured identically.

The construction method of a manhole structure according to claim 4 is a construction method of a manhole structure for joining concrete panels,
One concrete panel is provided with a sleeve case that opens to the joint surface, and a plurality of sleeve division pieces are arranged in a substantially cylindrical shape in the sleeve housing portion of the sleeve case, and engage with the inner peripheral surface. A sleeve provided with a groove is provided so that it can be expanded radially outward and cannot be removed from the sleeve case, and the sleeve divided pieces are biased radially inwardly on the outer periphery of the sleeve. A force member,
The other concrete panel is provided with a pin case that opens to the joint surface side,
In the pin housing portion of the pin case, a pin having a large diameter portion and a small diameter portion is provided such that the large diameter portion is movable in the radial direction and cannot be pulled out from the pin case, and the small diameter portion is Protruding from the joint surface of the other concrete panel, and provided with a protrusion that can be engaged with the engagement groove of the sleeve at the tip of the small diameter portion,
The small-diameter portion of the pin is press-fitted into the sleeve, and the protrusion of the pin is engaged with the engagement groove of the sleeve.

  The construction method of the manhole structure according to claim 5 is the invention according to claim 4, wherein the large diameter portions of the sleeve and the pin are pulled out to the opening side of the sleeve case and the pin case, respectively. It is characterized in that a cylindrical lid for restricting is screwed.

  A construction method for a manhole structure according to a sixth aspect is characterized in that, in the invention according to the fourth or fifth aspect, the sleeve case and the pin case are configured identically.

According to the manhole structure according to claim 1 and the manhole structure construction method according to claim 4, a plurality of concrete panels manufactured in a factory can be constructed by assembling in the field. The construction period can be shortened.
Further, in the joining using the joining tool provided with the pin and the sleeve according to the present invention, the large diameter portion of the pin is provided in the pin housing portion of the pin case so as to be movable in the radial direction. Even if there is some misalignment, the pin can be pressed into the sleeve. Therefore, when the concrete panels are joined together, the work can be performed while allowing a slight misalignment between the pin and the sleeve, so that the joining work can be performed quickly. In addition, since the accuracy of attaching the sleeve case and the pin case to the concrete panel can be relaxed, the production cost of the concrete panel can be reduced.

  According to the manhole structure according to claim 2 and the construction method of the manhole structure according to claim 5, since the lid is screwed onto the sleeve case and the pin case of the contact tool, the concrete panels are joined together. Before joining, the cover can be removed and the sleeve storage and pin storage can be cleaned.

  According to the manhole structure described in claim 3 and the manhole structure constructing method described in claim 6, since the sleeve case and the pin case of the joint are configured identically, the manufacturing cost of these can be reduced. As a result, the manufacturing cost of the concrete panel provided with these sleeve cases or pin cases can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 8 and 9, the manhole structure M includes a bottom plate block 21 made of precast concrete, a top block block 22 made of precast concrete, and four wall blocks 23 (two first blocks made of precast concrete). A box as a whole from six precast concrete panels (hereinafter referred to as “concrete panels”) of one wall block 23A, 23B, one second wall block 23C, and one third wall block 23D). Built on type.

Here, the bottom plate block 21 is formed in a flat plate shape as shown in FIG.
Moreover, the top plate block 22 has the flat board | substrate 22a, as shown in FIG. A manhole connection hole 22b is formed in the substrate 22a, and a lifting metal foot 22c is attached to the manhole connection hole 22b. Further, as shown in FIGS. 8 and 9, a circular manhole 25 is attached to the upper side of the manhole connection hole 22b.

  Further, as shown in FIG. 12, the first wall blocks 23A and 23B have a flat substrate 23a, and a box culvert connection hole 23b is formed in the substrate 23a. As shown in FIGS. 8 and 9, a box culvert (connection pipe) 26 is connected to the box culvert connection hole 23b. As shown in FIG. 15, the joint portion between the first wall blocks 23 </ b> A and 23 </ b> B and the box culvert 26 is filled with a joint material 29 and is made of a thick-band rubber flexible sheet. A flexible joint 30 is attached with a bolt 31. Here, the flexible joint 30 is bent and attached so that the central portion protrudes inward, and even if the position of the box culvert 26 with respect to the first wall blocks 23A and 23B is slightly shifted, liquid leakage from the connection portion occurs. It is supposed not to.

  As shown in FIG. 13, the second wall block 23C has a substrate 23a having a U-shaped cross section, and a box culvert connection hole 23b is formed in the substrate 23a. As shown in FIG. 8, a box culvert (connection pipe) 27 is connected to the box culvert connection hole 23b.

  Further, as shown in FIG. 14, the third wall block 23D includes a substrate 23a having a U-shaped cross section, and a large number of lifting metal fittings 23c are attached to the substrate 23a.

  Each concrete panel (bottom plate block 21, top plate block 22, first wall block 23A, 23B, second wall block 23C, third wall block 23D) constituting the manhole structure M is predetermined in the factory. Concrete is placed on the formwork and cured, and then manufactured and transported to the site for use. If concrete panels of different dimensions are prepared as stock, it can respond quickly to demand. Concrete panels are plate-shaped and do not require a large space even if they are stocked. Compared to box-shaped or cylindrical precast concrete members, concrete panels are smaller in size and lighter, so they can be easily carried into the site and handled at the site, such as cranes for construction. It is possible to reduce the size of heavy machinery.

  The two first wall blocks 23A and 23B are joined to the second wall block 23C and the third wall block 23D by the joint 1 respectively. Hereinafter, the joined state between the first wall blocks 23A and 23B and the second wall block 23C will be described, but the same applies to the joined state between the first wall blocks 23A and 23B and the third wall block 23D. .

  That is, as shown in FIG. 1, the case 5 with the deformed reinforcing bar (anchor bar) 3 of the connector 1 is embedded in the second wall block 23C. As shown in FIG. 3, the case 5 is formed in a cylindrical shape, and a columnar accommodating portion 5 a and female screw portions 5 b and 5 c are formed in the inner middle portion and both end portions, respectively. The inner diameter of the female screw portion 5b at the rear end is smaller than the inner diameter of the accommodating portion 5a, and the inner diameter of the female screw portion 5c at the front end is set to be approximately the same as the inner diameter of the accommodating portion 5a. As shown in FIG. 1, a male screw portion 3 b formed at one end portion of the deformed reinforcing bar 3 is screwed into a female screw portion 5 b at the rear end portion of the case 5.

  The sleeve 6 is accommodated in the accommodating portion 5a of the case 5 of the second wall block 23C. As shown in FIG. 4, this sleeve 6 is composed of three sleeve division pieces 6a having a circular cross section obtained by equally dividing a cylinder having a slightly larger outer diameter at both ends into 120 degrees in the circumferential direction. A plurality of engaging grooves 6b extending in the circumferential direction are formed on the inner peripheral surface of the split piece 6a. Further, a rubber band (biasing member) 6D is provided on the outer periphery of the sleeve divided pieces 6a, and each sleeve divided piece 6a is urged radially inward of the sleeve 6 by the rubber band 6D. 6 has a cylindrical shape.

  Further, as shown in FIG. 1, the lid 7 is mounted on the opening side of the case 5 so as to be substantially flush with the joining surface of the second wall block 23C. It is designed not to escape from the side. That is, as shown in FIG. 5, the lid 7 is a substantially cylindrical member, and includes a flange portion 7a and a male screw portion 7b. The male screw portion 7 b of the lid 7 is screwed into the female screw portion 5 c at the front end portion of the case 5. As shown in FIG. 1, the outer diameter of the sleeve 6 is set larger than the inner diameter of the lid 7 and larger than the inner diameter of the female screw portion 5 b at the rear end portion of the case 5. Therefore, the sleeve 6 is sandwiched from the front and rear by the tip of the male screw portion 7b of the lid 7 and the side surface of the housing portion 5a on the female screw portion 5b side of the case 5 (stepped surface between the female screw portion 5b and the housing portion 5a). In this state, the sleeve 6 is prevented from coming out of the housing portion 5a of the case 5. A part of the sleeve 6 extends to the inside of the female screw portion 5c.

  The outer diameter of the sleeve 6 is set to be smaller than the inner diameter of the housing portion 5a and the female screw portion 5c of the case 5, so that the outer peripheral surface of the sleeve 6, the inner peripheral surface of the housing portion 5a, and the female screw portion 5c There is a gap between them, and the sleeve 6 can be expanded radially outward against the urging force of the rubber band 6D.

  On the other hand, as shown in FIG. 1, a case 5 with a deformed reinforcing bar (anchor bar) 3 of the connector 1 is embedded in the first wall blocks 23 </ b> A and 23 </ b> B. Has been inserted. As shown in FIG. 6, the pin 14 includes a cylindrical large-diameter portion 14a and a cylindrical small-diameter portion 14b extending from the large-diameter portion 14a so as to coincide with the axis, and the tip of the small-diameter portion 14b. A plurality of protrusions 14c extending in the circumferential direction are formed on the outer peripheral surface of the portion. Furthermore, a tapered surface 14d is formed at the tip of the small diameter portion 14b. As shown in FIG. 1, the pin 14 has a large-diameter portion 14a housed in the housing portion 5a of the case 5, and a small-diameter portion 14b projecting outward from the joint surface of the first wall blocks 23A and 23B. . Then, the male threaded portion 7b of the lid 7 is screwed into the female threaded portion 5c at the front end of the case 5, so that the lid 7 is substantially flush with the joint surface of the first wall blocks 23A, 23B on the opening side of the case 5. As a result, the large diameter portion 14a is prevented from coming out of the opening side of the case 5. The outer diameter of the large diameter portion 14 a is set larger than the inner diameter of the lid 7 and larger than the inner diameter of the female screw portion 5 b at the rear end portion of the case 5. Therefore, the large-diameter portion 14a is sandwiched from the front and rear by the front end portion of the male screw portion 7b of the lid 7 and the side surface of the housing portion 5a on the female screw portion 5b side of the case 5 (stepped surface between the female screw portion 5b and the housing portion 5a). In this state, the large diameter portion 14a is prevented from coming out of the housing portion 5a of the case 5. A part of the large diameter portion 14a extends to the inside of the female screw portion 5c.

  And the small diameter part 14b which protrudes outward from the joint surface of 1st wall block 23A, 23B is inserted in the case 5 of 1st wall block 23A, 23B, and the protrusion 14c of the front-end | tip part is the sleeve 6 Is engaged with the engaging groove 6b.

Next, the process of constructing the manhole structure M will be described based on FIG.
First, earth work is performed (step ST1). That is, earth retaining work is performed (step ST1a) and excavation work is performed (step ST1b). Thereafter, drainage is performed (step ST1c), and foundation work is performed (step ST1d). In this foundation work, as shown in FIG. 9, foundation concrete 33 is laid on the foundation crushed stone 32. This completes the earthwork.

Next, a product carrier is performed (step ST2). That is, each concrete panel constituting the manhole structure M is carried into the site.
Next, the manhole structure M is installed (step ST3).
That is, first, preparation work is performed (step ST3a). In this preparatory work, while checking the top end height and finishing condition of the foundation concrete 33, the curing period is confirmed. Then, the position which installs a manhole on the foundation concrete 33 is confirmed (step ST3b). Then, a mortar (not shown) is laid flat on the foundation concrete 33 and leveled (step ST3c). Then, it is confirmed whether the packing material is affixed on the joint surface of each concrete panel (step ST3d).

  Then, the bottom block 21 is built (step ST3e). For this purpose, as shown in FIG. 17, the bottom block 21 is suspended by a wire rope 34 of a crane, and placed on a mortar while ensuring flatness.

  Next, four wall blocks 23 are built (step ST3f). For this purpose, as shown in FIG. 18A, the second wall block 23C is erected on the bottom block 21 and temporarily fixed while ensuring the verticality. Thereafter, as shown in FIG. 18B, the second wall block 23C is erected on the bottom block 21 and joined to the first wall block 23A. Similarly, as shown in FIG. 18C, the first wall block 23B is erected on the bottom block 21 in parallel with the first wall block 23A and joined to the second wall block 23C. Thereafter, as shown in FIG. 18 (d), the third wall block 23D is erected in parallel with the second wall block 23C on the bottom block 21, and joined to the first wall blocks 23A and 23B.

  Here, in order to join the first wall blocks 23A and 23B to the second wall block 23C using the joining tool 1, first, the sleeve 6 is inserted into the case 5 embedded in the second wall block 23C. After the sleeve 6 is stored in the storage portion 5a, the lid 7 is attached to the case 5 so that the sleeve 6 does not come out of the storage portion 5a. Further, after inserting the pin 14 into the case 5 embedded in the first wall blocks 23A and 23B and positioning the large diameter portion 14a in the storage portion 5a, the lid 7 is attached to the case 5 and the large diameter portion 14a is prevented from coming out of the storage portion 5a.

  Next, after inserting the small diameter portion 14b of the pin 14 into the case 5 of the second wall block 23C, the first wall blocks 23A and 23B are moved closer to the second wall block 23C, and the joint surfaces are brought into contact with each other. Make contact. In this case, after inserting the small-diameter portion 14b of the pin 14 into the case 5 of the second wall block 23C, the joint surfaces are tightened with a predetermined torque with a bolt of the bolt box until there is no gap between the joint surfaces. Make contact.

  Then, the rear end surface of the large-diameter portion 14a of the pin 14 is pushed by the side surface (step surface between the female screw portion 5b and the accommodating portion 5a) of the case 5 on the female screw portion 5b side, and the small-diameter portion 14b of the pin 14 is pressed. Is press-fitted into the sleeve 6. As a result, the tip of the small diameter portion 14b moves forward in the sleeve 6 while expanding the sleeve 6 radially outward against the urging force of the rubber band 6D, and when the forward movement is completed, The protrusion 14c is engaged with the engagement groove 6b of the sleeve split piece 6a and is tightened radially inward by the rubber band 6D. When the pin 14 moves forward, the sleeve 6 (each sleeve split piece 6 a) is pushed by the pin 14 toward the female screw portion 5 b, but the end surface of the sleeve 6 on the female screw portion 5 b side is the accommodating portion on the female screw portion 5 b side of the case 5. Abutting on the side surface of 5a (the step surface between the female screw portion 5b and the accommodating portion 5a), the movement of the sleeve 6 is restricted.

  When the protrusion 14c of the pin 14 is engaged with the engagement groove 6b of the sleeve 6 in this way, the pin 14 cannot move to the lid 7 side with respect to the sleeve 6, and thereby the first wall block 23A. , 23B are joined to the second wall block 23C. When the pin 14 tries to move to the lid 7 side, the sleeve 6 tries to move together with the pin 14, but the end surface of the sleeve 6 on the female screw portion 5 c side is the side surface of the housing portion 5 a on the female screw portion 5 c side of the case 5 ( The movement of the sleeve 6 is restricted by contacting the stepped surface between the female screw portion 5c and the accommodating portion 5a.

Further, in order to join the third wall block 23D to the first wall blocks 23A, 23B using the joining tool 1, the third wall block 23D is connected to the sleeve 6 attached to the first wall blocks 23A, 23B. The pin 14 attached to the wall block 23D is press-fitted.
Each wall block 23A, 23B, 23C, 23D is joined to the bottom plate block 21 with a bolt.

Next, the top block 22 is built (step ST3g). For this purpose, as shown in FIG. 19, the top block 22 is suspended by a crane wire rope 34, placed on the four wall blocks 23, and firmly fixed with bolts.
Here, the installation of the manhole structure M is completed.

  Next, as shown in FIG. 15, the joint material 29 is filled in the connection portion between the first wall blocks 23 </ b> A and 23 </ b> B and the box culvert 26 (step ST <b> 4). Further, the flexible joint 30 is attached so as to straddle the first wall blocks 23A, 23B and the box culvert 26 (step ST5).

Next, backfilling is performed (step ST6). In this backfilling work, a backfilling material is buried around the manhole structure M and is sufficiently compacted with a rammer or the like.
Finally, the earth retaining material is pulled out (step ST7), the finished shape management is performed (step ST8), and the safety management is performed (step ST9).
Here, the construction process of the manhole structure M is completed.

  In such a manhole structure M and a method for constructing the manhole structure M, a plurality of concrete panels (bottom plate block 21, top plate block 22, wall blocks 23A, 23B, 23C, 23D) manufactured in a factory are used. Since it can be constructed by assembling on-site using the connector 1 and bolts, standardization of work and shortening of the work period can be achieved.

  Further, in the joining of the wall blocks using the joining tool 1, the large diameter portion 14 a of the pin 14 is provided in the pin housing portion 5 a of the pin case 5 so as to be movable in the radial direction. Even if there is a slight misalignment between the pins 14, the pin 14 can be pressed into the sleeve 6. Therefore, when the wall blocks are joined together, the work can be performed without worrying about a slight misalignment between the pin 14 and the sleeve 6, so that the joining work can be performed quickly. Moreover, since the mounting accuracy of the sleeve case 5 and the pin case 5 with respect to the wall block can be relaxed, the manufacturing cost of the wall block can be reduced.

  Further, since the lid 7 is screwed to the sleeve case 5 and the pin case 5 of the connector 1, the lid 7 is removed before the wall blocks are joined to each other, and the sleeve storage portion 5a and the pin storage portion 5a are attached. Can be cleaned.

  Furthermore, since the sleeve case 5 and the pin case 5 of the connector 1 are configured in the same manner, the manufacturing cost of these can be reduced, and as a result, the wall block 23A in which these sleeve case 5 or pin case 5 is embedded. , 23B, 23C, 23D can be reduced. In addition, since the lid 7 screwed into the sleeve case 5 and the pin case 5 is also configured in the same manner, the lid 7 to be mounted between the sleeve case 5 and the pin case 5 is not mistaken.

  In the above-described embodiment, the sleeve 6 is constituted by the sleeve divided piece 6a divided into three equal parts at 120 °. However, the sleeve 6 is not necessarily divided into three equal parts, for example, 180 °, 90 °, 90 °. A sleeve divided piece divided into three may be used. Further, it is also possible to employ a sleeve divided piece divided into two or four instead of three.

  Further, in the above-described embodiment, the case where the rubber band 6D is used as the urging member has been described. However, the present invention is not limited to this, and the urging member urges each sleeve divided piece 6a radially inward. For example, a ring-shaped member made of an elastic material such as rubber or synthetic resin, a spring member such as a coil spring, or a non-circular C-shaped spring member can be used as appropriate.

  In the above-described embodiment, the sleeve case 5 and the pin case 5 are configured the same, but they may be configured differently. Further, the lid 7 is screwed onto the sleeve case 5 and the pin case 5, but instead, the lid 7 may be fixed to the sleeve case 5 and the pin case 5 by welding or the like. Further, the sleeve 6 and the large diameter portion 14a of the pin 14 may not be removed without providing the lid 7, and a sleeve case or a pin case that cannot be pulled out may be configured.

It is sectional drawing which shows the use condition of the connector of the manhole structure which concerns on embodiment of this invention. It is a side view of a deformed bar. It is a figure which shows a case, Comprising: It is a side view which shows an upper half with a cross section. It is a figure which shows a sleeve, Comprising: (a) is a side view which shows an upper half in cross section, (b) is a right view of (a). It is a figure which shows a cover, Comprising: (a) is a front view, (b) is sectional drawing which follows the AA line of (a). It is a side view which shows a pin. It is sectional drawing which shows the other use condition of the connector of the manhole structure which concerns on embodiment of this invention. It is a top view which shows the connection of a manhole structure and a box culvert. It is sectional drawing which follows the BB line of FIG. It is a figure which shows a bottom block, Comprising: (a) is a top view, (b) is a front view. It is a figure which shows a top plate block, Comprising: (a) is a top view, (b) is a front view. It is a figure which shows a 1st wall block, Comprising: (a) is a front view, (b) is a top view. It is a figure which shows a 2nd wall block, Comprising: (a) is a front view, (b) is a top view. It is a figure which shows a 3rd wall block, Comprising: (a) is a front view, (b) is a top view. It is an enlarged view of the joint part of a manhole structure and a box culvert. It is a construction flow figure which builds a manhole structure. It is a perspective view which shows the erection process of a bottom block. It is a perspective view which shows the erection process of a wall block. It is a perspective view which shows the erection process of a top block.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joining tool 5 Sleeve case, pin case 5a Sleeve accommodating part, Pin accommodating part 6 Sleeve 6a Sleeve division | segmentation piece 6b Engaging groove 6D Rubber band (biasing member)
7 Lid 14 Pin 14a Large diameter part 14b Small diameter part 14c Projection 21 Bottom plate block (concrete panel)
22 Top block (concrete panel)
23A, 23B, 23C, 23D Wall block (concrete panel)
M Manhole structure

Claims (6)

A manhole structure in which concrete panels are joined together with a joint tool,
Joiners that join concrete panels together
A sleeve case provided on one concrete panel and opened to the joint surface side of the concrete panel;
A plurality of sleeve division pieces are arranged in a substantially cylindrical shape, and are provided in the sleeve accommodating portion of the sleeve case so as to be radially outwardly expandable and not removable from the sleeve case. A sleeve provided with an urging member for urging the sleeve split piece radially inward, and an engagement groove on the inner peripheral surface;
A pin case provided on the other concrete panel and opened to the joint surface side of the concrete panel;
A large-diameter portion and a small-diameter portion, wherein the pin-receiving portion of the pin case is provided with the large-diameter portion so as to be movable in a radial direction and not coming out of the pin case. A pin that protrudes from the joint surface of the concrete panel and is provided with a protrusion that can be engaged with the engagement groove of the sleeve at the tip of the small-diameter portion;
With
The manhole structure, wherein the small-diameter portion of the pin is press-fitted into the sleeve, and a protrusion of the pin is engaged with an engagement groove of the sleeve.   2. The cylindrical lid that restricts the large-diameter portions of the sleeve and the pin from slipping out is screwed into the opening side of the sleeve case and the pin case, respectively. Manhole structure.   The manhole structure according to claim 1 or 2, wherein the sleeve case and the pin case are configured identically. A method for constructing a manhole structure that joins concrete panels together,
One concrete panel is provided with a sleeve case that opens to the joint surface, and a plurality of sleeve division pieces are arranged in a substantially cylindrical shape in the sleeve housing portion of the sleeve case, and engage with the inner peripheral surface. A sleeve provided with a groove is provided so that it can be expanded radially outward and cannot be removed from the sleeve case, and the sleeve divided pieces are biased radially inwardly on the outer periphery of the sleeve. A force member,
The other concrete panel is provided with a pin case that opens to the joint surface side,
In the pin housing portion of the pin case, a pin having a large diameter portion and a small diameter portion is provided such that the large diameter portion is movable in the radial direction and cannot be pulled out from the pin case, and the small diameter portion is Protruding from the joint surface of the other concrete panel, and provided with a protrusion that can be engaged with the engagement groove of the sleeve at the tip of the small diameter portion,
A method for constructing a manhole structure, wherein the small diameter portion of the pin is press-fitted into the sleeve, and the protrusion of the pin is engaged with the engagement groove of the sleeve.   5. The cylindrical lid that restricts the large-diameter portion of the sleeve and the pin from coming out is screwed into the opening side of the sleeve case and the pin case, respectively. To build a manhole structure.   6. The method for constructing a manhole structure according to claim 4, wherein the sleeve case and the pin case are configured identically.

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