JP2008231875A - Manhole falling curing frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manhole falling curing frame capable of securing safety of a worker when lifting a step, without making a curing frame fall in use, while easily assembling the curing frame. <P>SOLUTION: A pair of right-left side frames 7 and 8 composed of a pair of front-rear wall girder materials 1 and 2, a pair of front-rear vertical materials 3 and 4 and horizontal materials 5 and 6 connecting both vertical materials 3 and 4, are installed so that an attitude can be changed to an upright attitude and a folding-up attitude of folding up the mutual vertical materials 3 and 4 in layers on the wall girder materials 1 and 2, and an expansion girth 9 is extended between the laterally opposed front vertical materials 3 sand 3 and between the rear vertical materials 4 and 4 of both side frames 7 and 8. Its one end part is pivoted on the opposed one vertical material 3 or 4, and the other end part is removably installed on the other vertical material 3 or 4. A sleeper material 10 is removably horizontally installed between upper end parts of both side frames 7 and 8, and an installation member 11 is slidably installed in the longitudinal direction of the sleeper material on the sleeper material 10, and a safety block SB is installed on the installation member 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a manhole fall curing frame, which prevents a worker from falling when moving up and down steps in a manhole during work in a manhole such as a construction site, or a third party falls into a manhole. The present invention relates to a manhole fall curing frame for preventing the above.

  As a conventional manhole dropping curing frame, specific publicly known documents such as a patent publication cannot be cited, but the conventionally used manhole dropping curing frame B sandwiches the opening O of the manhole MH as shown in FIG. And a pair of steel pipe frame bodies 31, 31 disposed on both sides thereof, and steel pipe connecting pipes 32, 32 connecting the end portions of both frame bodies 31, 31. Each frame body 31 is a steel pipe. A plurality of vertical members 31 a, cross members 31 b, and intermediate bars 31 c are integrally framed, and connecting pipes 32 and 32 are bridged between the end portions of both frame bodies 31 and 31, and are fixed by pipe clamps 33. It is like that.

  Therefore, when working on the manhole, the work safety rope 37 is suspended in the manhole MH, and the upper end of the work safety rope 37 is connected to the connecting pipe 32 or the frame body 31 as shown in FIG. Thus, the worker goes up and down the steps in the manhole MH.

  In the above-described conventional manhole dropping curing frame B, it takes time to assemble, and the attachment position of the safety rope 37 to the curing frame B is not the center position of the curing frame B, as shown in FIG. Since the position is biased from the position to the peripheral side, the danger that the curing frame B falls down due to the tension applied to the rope mounting position of the curing frame B when the worker is moving up and down while grasping the rope 37, and the operator falls down. There was sex.

  In view of the above-mentioned problems, the present invention can easily assemble a curing frame and prevent the curing frame from falling down during use, and can secure the safety of an operator who is moving up and down steps. The purpose is to provide a drop curing frame.

  Means for solving the above problems will be described with reference numerals in the embodiments described later. According to the first aspect of the present invention, the left and right ends of the pair of front and rear siding girders 1 and 2, respectively. A pair of left and right side frames 7 and 8 comprising a pair of longitudinal members 3 and 4 and transverse members 5 and 6 connecting the longitudinal members 3 and 4 are laid with the upright posture and the longitudinal members 3 and 4 overlapping each other. It is attached to the folding posture folded on the girders 1 and 2 so that the posture can be changed, and between the front vertical members 3 and 3 and between the rear vertical members 4 and 4 facing the left and right of the side frames 7 and 8 respectively. Respectively, the stretchable connecting member 9 is bridged, and one end portion thereof is pivotally attached to one opposing vertical member 3 or 4, and the other end portion is detachably attached to the other vertical member 3 or 4. , 8 is detachably mounted on the large pulling material 10 between the upper ends thereof, and the mounting member 11 is attached to the large pulling material 10.引材 longitudinal slidably mounted, characterized in that to attach the working rope 37 to the mounting member 11.

  According to a second aspect of the present invention, in the manhole dropping curing frame according to the first aspect, a safety block SB around which the wire rope 37 is unwound and wound up is attached to the attachment member 11. .

  Claim 3 is the manhole drop curing frame according to claim 1 or 2, wherein the expansion / contraction binder 9 is connected to the fixed tube 9a and the fixed tube 9a so as to expand and contract and can be locked at a required expansion / contraction position. 9b, the base end of the fixed tube 9a is pivotally attached to one longitudinal member 3 or 4, and the distal end of the telescopic tube 9b is attached to the other longitudinal member 3 or 4 by the knob bolt 24 It is characterized by.

  The fourth aspect of the present invention is the manhole dropping curing frame according to the third aspect of the present invention, wherein the expansion / contraction binder 9 has the base end of the fixed tube 9a pivoted to one of the vertical members 3 or 4, and the distal end of the expansion / contraction tube 9b is attached. The knob bolt 24 is screwed to the other vertical member 3 or 4, and the distal end of the telescopic tube 9 b is screwed to the one vertical member 3 or 4 by the knob bolt 24 in a state where the telescopic tube 9 b is contracted with respect to the fixed tube 9 a. It is characterized by being worn and stored.

  The effect of the invention by the above-described solution means will be described with reference numerals in the embodiments described later. According to the invention according to claim 1, the pair of left and right side frames 7, 8 can be divided into an upright posture and a folded posture. At each end of the side frames 7, 8, a telescopic connecting member 9 is bridged between the front vertical members 3, 3 and the rear vertical members 4, 4. The part is pivotally attached to one of the vertical members 3 or 4 facing each other, the other end is detachably attached to the other vertical member 3 or 4, and a large pulling material 10 is placed between the upper ends of both side frames 7 and 8. Since it is detachably mounted horizontally, the curing frame can be easily assembled and folded.

  Further, since the work rope 37 is attached to the attachment member 11 slidably attached to the large pulling material 10, the work rope 37 can be suspended from an arbitrary position of the large pulling material 10, and the attachment member 11 is made large. If it is set closer to the center of the pulling material 10, the curing frame will not fall down during the work, and the safety of the worker who is moving up and down the step can be ensured.

  As in the invention according to claim 2, when the safety block SB in which the wire rope 37 is wound around the attachment member 11 so as to be unwound and wound up is attached, when the operator moves up and down the steps of the manhole MH, If the wire rope 37 of the safety block SB is pulled suddenly even if it is likely to fall due to slipping of the foot, etc., the brake will be applied and the fall will be stopped within the minimum length, and an unexpected accident will occur in advance. Can be prevented.

  According to the invention of claim 3, the expansion / contraction binder 9 is composed of a fixed tube 9a and an expansion / contraction tube 9b that is connected to the fixed tube 9a so as to be expandable / contractable and can be locked at a required expansion / contraction position. Since the base end of 9a is pivotally attached to one longitudinal member 3 or 4, and the distal end of the expansion tube 9b is attached to the other longitudinal member 3 or 4 by the knob bolt 24, by loosening the knob bolt 24, The distal end portion of the telescopic tube 9b can be easily attached to and detached from the material 3 or 4.

  According to the invention of claim 4, the expansion / contraction binder 9 has the base end portion of the fixed tube 9 a pivoted to one vertical member 3 or 4, and the distal end portion of the expansion tube 9 b is connected to the other vertical member by the knob bolt 24. The telescopic tube 9b is contracted with respect to the fixed tube 9a, and the distal end portion of the telescopic tube 9b is screwed into one longitudinal member 3 or 4 with the knob bolt 24 so as to be stored. Therefore, when folding and storing, each stretchable connecting member 9 can be fixed along the vertical members 3 and 4 of the side frames 7 and 8, so that the side frames 7 and 8 can be easily folded and folded. In this case, the stretchable connecting members 9 are not rattled, and the conveyance becomes easier.

  A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 (a) is a perspective view showing an entire manhole dropping curing frame according to the present invention, and (b) is a perspective view showing a safety block. 2A is a front view of the manhole dropping curing frame, FIG. 2B is a plan view, FIG. 3A is a right side view, FIG. 2B is a rear view, and FIG. (a) is a plan view of the manhole fall curing frame folded, and (b) is a front view.

  In these figures, the manhole dropping curing frame of the present invention indicated by A, as can be seen from FIG. 1 (a), is provided at the left and right ends of the pair of front and rear girder members 1 and 2, respectively. A pair of left and right side frames 7, 8 composed of upper and lower horizontal members 5, 6, and middle vertical members 12 and diagonal members 13, 13 connecting the four vertical members 3, 4, and an upright posture perpendicular to the horizontal plane, The vertical members 3, 3, 4, 4 are overlapped so that they can be changed to a folding posture in which they are folded on the siding girders 1, 2, and the front verticals facing the left and right sides of both side frames 7, 8 respectively. Between the members 3 and 3 and between the rear longitudinal members 4 and 4, the stretchable connecting member 9 is bridged, and one end thereof is pivotally attached to the opposite one of the longitudinal members 3 and 4, and the other end is connected to the other. 3 and 4 are detachably attached, and the large pulling material 10 is detachably placed between the upper ends of the side frames 7 and 8, The attachment member 11 is attached to the large drawing material 10 so as to be slidable in the longitudinal direction of the large drawing material 10.

  The structure of the manhole dropping curing frame A will be described in detail with reference to FIGS. 5 to 8. First, FIG. 5 (a) is a partially enlarged view of FIG. 2 (a). 1 and the lower end portion of the front longitudinal member 3 foldably attached to the front spar 1 are shown, (b) is a left side view of (a), and (b) is of (a). It is a right view.

  As can be seen from FIG. 5, vertical member mounting brackets 14 and 14 are fixed to the front and rear girder members 1 on the front and rear side surfaces of the left end portion, and the front vertical members 3 and 3 are interposed between the brackets 14 and 14. Of these, the lower end of the left vertical member 3 has an elongated posture 15 of the bracket 14 and a pivot 16 inserted therethrough, and an upright posture shown in FIG. It is pivotally mounted so that it can be rotated and folded so that it overlaps on the roof girder 1, and the left vertical member 3 is placed upright on the upper surface of the left end of the front girder 1. A holding plate 17 is attached. In the state in which the left vertical member 3 is held in the upright posture, the pivot 16 is positioned in the lower half of the long hole 15 as shown in FIG. When the longitudinal member 3 is rotated clockwise as indicated by the arrow b after the pivot 16 is moved upward as indicated by the arrow a in FIG. 3 is overlapped on the roof girder 1 and folded into a folding posture.

  Further, vertical member mounting brackets 18 and 18 having a height higher than that of the bracket 14 of the left vertical member 3 are fixed to the front and rear side surfaces of the right end portion of the front span girder 1, and the right vertical member is interposed between the brackets 14 and 14. 3 is rotated by 90 degrees counterclockwise from the upright position shown in FIG. 5 (a) and the upright position shown in FIG. 5 by the long hole 19 of the bracket 18 and the pivot 20 inserted therethrough. It is pivotally attached to the folding posture that is folded so as to be superimposed on the left vertical member 3 folded on the floor girder 1, and the right side of the upper surface of the front girder 1 is on the right side. A holding plate 21 that holds the vertical member 3 in an upright posture is attached. In the state where the right vertical member 3 is held in the upright posture, the pivot 20 is located in the lower half of the long hole 19 as shown in FIG. When the pivot 20 is lifted upward as shown by the arrow c in FIG. 1 (a) and the pivot 20 is moved to the upper half of the long hole 19, the right vertical member 3 is rotated counterclockwise as shown by the arrow d. The material 3 overlaps on the left vertical material 3 previously folded on the spar 1 and is folded in a folding posture.

  FIG. 5 shows the front span girder 1 and the front vertical member 3 foldably attached thereto. However, the rear longitudinal member 4 foldably attached on the rear girder 1 is described above. Since it is completely the same as the mounting structure of the front vertical member 3, illustration and description thereof are omitted. The front girder material 1 and the rear vertical material 4 are configured as described above, so that the left and right side frames 7 and 8 have the upright posture and the vertical materials 3 and 4 overlap each other so that the girder material 1 , 2 can be changed to a folding position folded up.

  6 (a) is a partially enlarged view of FIG. 2 (a), showing the state when the elastic binder 9 is attached, and FIG. 6 (b) is a front view showing the state when the elastic binder 9 is contracted, (c) is an enlarged view of a portion indicated by an arrow X in (a), (d) is a YY sectional view of (c), and (a) in FIG. 7 is a further enlarged view of (a) in FIG. Front view, (b) is a cross-sectional view taken along line VV of (a). As can be seen from these drawings, the expansion / contraction binder 9 is connected to the fixed tube 9a having a tubular shape, and is connected to the fixed tube 9a so as to be expandable / contracted, and can be locked by the locking means 22 at a required expansion / contraction position. The telescopic tube 9b is composed of a base end portion of the fixed tube 9a attached to one longitudinal member 3 or 4 by a pivot 23, and a distal end portion of the telescopic tube 9b is attached to the other longitudinal member 3 or 4 by a knob bolt 24. I try to install it.

  As shown in FIG. 6 (c), the lock means 22 has an engagement hole 25 (consisting of an engagement hole 25b of the expansion tube 9b and an engagement hole 25a of the fixed tube 9a) or 26 from the inside of the expansion tube 9b. A pin member 27 having a length that passes through the engaging hole 25b of the telescopic tube 9b and the engaging hole 26a of the fixed tube 9a and protrudes from the outer peripheral surface of the fixed tube 9a, and the pin member 27 is It consists of a leaf spring 28 inserted into the telescopic tube 9b so as to project and urge from the joint hole 25 or 26, and the head of the pin member 27 is round, for example, hemispherical, and this pin member 27 is pressed against the urging force of the leaf spring 28, and the portion protruding from the outer peripheral surface of the fixed tube 9a is retracted into the engagement hole 25 or 26, whereby the unlocked state is established, and the telescopic tube 9b is moved. It can be expanded and contracted with respect to the fixed tube 9a, thus extending the expandable tube 9b. When the pin member 27 comes to the position of the engagement hole 25 or 26 while being contracted, the pin member 27 engages with the engagement hole 25 or 26 by the urging force of the leaf spring 28, and the expansion tube 9b is fixed to the fixed tube. 9a is locked.

  FIG. 6 (a) shows a state in which the upper end portions of the front vertical members 3, 3 or the rear vertical members 4, 4 of the left and right side frames 7, 8 are connected in a horizontal posture. The connecting member 9 is locked in an extended state by the pin member 27 of the locking means 22 engaging with the engagement holes 25 of the expansion tube 9b and the fixed tube 9a, and the distal end of the expansion tube 9b is locked by a knob bolt 24 on one side. It is fixed to the vertical member 3. Further, (b) in the figure shows a state when the telescopic tube 9b is contracted into the fixed tube 9a after the knob bolt 24 is loosened and the distal end portion of the telescopic tube 9b is removed from the longitudinal member 3, and at this time The telescopic binder 9 is locked in the contracted state (stored state) by the pin member 27 of the locking means 22 engaging the engaging hole 26 of the telescopic tube 9b and the fixed tube 9a.

  As shown in FIG. 1 and FIG. 2 (a), the front vertical members 3, 3 of the left and right side frames 7, 8 are stretched horizontally between the upper ends of the front vertical members 3, 3. In addition to the connecting material 9, there is another elastic connecting material 9 that is obliquely bridged between the upper ends of the front vertical members 3, 3. This diagonally extending elastic material 9 is horizontally extended and expanded. The configuration is the same as that of the connecting material 9.

  (A) of FIG. 7 is an enlarged front view showing the attachment state of the stretchable binder 9 to the longitudinal members 3 and 4, and (b) is a cross-sectional view taken along the line VV of (a). As can be seen from this figure, the base end portion of the fixed tube 9a of the expansion / contraction binder 9 is pivotally attached to one longitudinal member 3 or 4 by a pivot 23 made of bolts and nuts, and is attached to the distal end portion of the expansion tube 9b. The knob bolt 24 is detachably screwed into the nut 30 provided on the other longitudinal member 3 or 4 through the attachment piece 29. Therefore, by loosening the knob bolt 24, the tip of the telescopic tube 9b can be easily and easily detached from the longitudinal member 3 or 4. Since the compression bolt spring 44 is interposed in the knob bolt 24 as shown in FIG. 7 (b), the distal end portion of the expansion / contraction binder 9 is attached to the vertical member 3 or 4 and there is no backlash and it is accurate. Fixed to.

  8A is an enlarged view of a portion indicated by an arrow W in FIG. 2A, and FIG. 8B is a cross-sectional view taken along the line Q-Q in FIG. The state which attached the large pulling material 10 so that the longitudinal direction slide was possible is shown. The large pulling material 10 is formed of a rectangular tube-shaped mold material, and the mounting member 11 is slidably fitted to the large pulling material 10 made of this rectangular tube-shaped mold material, and a safety block mounting ring 35 at the lower end portion. And the safety block SB is attached to the ring 35.

  The safety block SB has a known structure as shown in FIG. 1B, and includes a case 36 and a work wire rope 37 wound around the case 36 so as to be unwound and wound up. 36 is provided with a detachable ring 38 that is detachably attached to the ring 35 of the attachment member 11, and a detachable hook 39 that can be engaged with a safety belt worn by an operator is provided at the tip of the wire rope 37. . The feature of this safety block SB is that when used in the manhole MH, when the operator moves a step or the like at a normal speed, the wire rope 37 is automatically drawn out or wound up. However, if it crashes due to some accident and the wire rope 37 is pulled rapidly, the fall is stopped within a minimum length, for example, 60 cm.

  Further, as shown in FIG. 9 (a), engaging portion pieces 40 project downward at right angles on the bottom surfaces of both ends of the large pulling material 10, and the middle vertical members 12 of the side frames 7, 8 As shown in FIG. 9 (b), an engagement recess 41 for engaging with the engagement piece 40 of the large pulling material 10 is provided, and the engagement piece 40 is engaged with the engagement recess 41. A lock pin 42 for preventing the engagement piece 40 from coming out is provided, and this lock pin 42 is connected to a chain 43 attached to the middle vertical member 12.

  In order to assemble the manhole drop curing frame configured as described above, the pair of front and rear girder materials 1 and 2 and the pair of left and right side frames 7 and 8 are assembled together in advance. Therefore, the stretchable connecting members 9 are bridged between the front vertical members 3, 3 and the rear vertical members 4, 4 facing the left and right of the side frames 7, 8, respectively. What is necessary is just to lay the large pulling material 10 between upper end parts. At this time, since the base end portion of the fixed tube 9a is pivotally attached to the vertical members 3 and 4 in advance, the extension bolt 9 is provided with the knob bolt 24 at the distal end portion of the expandable tube 9b on the vertical members 3 and 4. The large pulling material 10 may be engaged with an engaging recess 41 provided in the middle longitudinal member 12 of the side frames 7 and 8, and the large pulling material 10 may be tightened by screwing into a nut 30. And since the lock pin 42 should just be inserted in the engaging piece 40 from the middle vertical member 12, it can assemble easily and easily.

  After assembling the manhole dropping curing frame in this way, if the detachable ring 38 of the safety block SB is attached to the ring 35 of the attachment member 11 attached to the large pulling material 10, the operator can install the safety belt that he / she is wearing. Attach the attachment / detachment hook 39 of the safety block SB to the manhole MH and start the work. At the start of this operation, the operator appropriately slides the mounting member 11 for mounting the safety block along the large pulling material 10 and sets the position of the mounting member 11 to a desired value in the manhole MH. It is easy to enter, and when the work is carried out after going down the steps, the position of the mounting member 11 is changed by another worker on the ground, so that the hanging position of the safety block SB is set in the manhole MH. The desired position can be set.

  Also, when the worker goes up and down the steps of the manhole MH, even if the operator is likely to slide his / her foot and crash, if the wire rope 37 of the safety block SB is pulled suddenly, the brake is applied and the minimum The fall is stopped within the length, preventing unexpected accidents.

  When the manhole MH is finished and the manhole dropping curing frame is withdrawn, a method for folding the manhole falling curing frame will be described with reference to FIGS. 9 to 11. First, after removing the safety block SB, As shown in FIG. 9 (a), the large pulling material 10 is removed from the side frames 7 and 8. When removing the large pulling material 10, the locking pin 42 is pulled out from the middle vertical member 12 of the side frames 7, 8 and then the large pulling material 10 is lifted.

  After removing the large pulling material 10, as shown in FIG. 9 (a), the knob bolt 24 at the tip of the expansion tube 9 b of each expansion / contraction binder 9 is loosened and detached from the vertical member 3 or 4, and then the expansion tube 9b is contracted, rotated around the base end of the fixed tube 9a, and superposed on the longitudinal member 3 or 4, the knob bolt 24 at the distal end of the telescopic tube 9b is provided on the longitudinal member 3 or 4. The nuts 30 are screwed into the nuts 30 and fastened and fixed so that the left and right side frames 7 and 8 face each other in an upright posture as shown in FIG.

  Then, as shown in FIG. 10, the left side frame 7 of both side frames 7, 8 facing each other in an upright posture is once pulled up, rotated clockwise, and folded so that it overlaps with the roof beams 1, 2. The state shown in FIG. Thereafter, the right side frame 8 is also rotated counterclockwise in the state where the right side frame 8 is once lifted, and is folded so as to overlap the left side frame 7 folded on the floor girders 1 and 2 in advance. It will be in the state shown in As a result, the left and right side frames 7 and 8 of the manhole dropping curing frame are folded compactly on the roof girder materials 1 and 2, which is convenient for movement, transportation and storage.

  In this case, each stretchable binder 9 is fixed in a state along the vertical members 3 and 4 forming the side frames 7 and 8, so that the side frames 7 and 8 can be easily folded and folded. When in the open state, the stretchable connecting members 9 do not rattle, and the curing frame can be moved and transported more easily.

  In the above embodiment, the safety block SB is attached to the attachment member 11 slidably attached to the large pulling material 10, but a work safety rope may be attached to the attachment member 11. However, it is preferable to attach the safety block SB, an unexpected situation can be avoided, and work safety can be sufficiently secured.

(a) is a perspective view which shows the whole manhole fall curing frame based on this invention, (b) is a perspective view which shows a safety block. (a) is a front view of the manhole fall curing frame, and (b) is a plan view. (a) is a right side view of the manhole fall curing frame, and (b) is a rear view. (a) is a plan view of the manhole fall curing frame folded, and (b) is a front view. (a) is a partially enlarged view of (a) of FIG. 2, (b) is a left side view of (a), and (b) is a right side view of (a). (a) is a partially enlarged view of (a) of FIG. 2, showing the state when the stretchable binder is attached, (b) is a front view showing the state when the stretchable binder is contracted, (c) (A) is an enlarged view of a portion indicated by an arrow X, and (d) is a YY sectional view of (c). (a) is the enlarged front view of (a) of FIG. 6, (b) is the VV sectional view taken on the line of (a). (a) is the enlarged view of the part shown by the arrow W of (a) of FIG. 2, (b) is the QQ sectional view taken on the line of (a). (a) is the front view which shows the state which removed the large pulling material in folding the manhole fall curing frame, (b) is the RR sectional view taken on the line of (a). It is a front view which shows the state which folded the expansion-contraction binder and left and right side frame faced in the upright posture. It is a front view which shows the state which folded the left side frame of both side frames. It is a front view which shows the state which folded both side frames. It is a perspective view which shows the use condition of the conventional manhole fall curing frame.

Explanation of symbols

1, 2 Girder material 3, 4 Side frame vertical member 5, 6 Side frame cross member 7, 8 Side frame 9 Stretching connecting member 10 Large draw member 11 Mounting member SB Safety block 37 Wire rope

Claims (4)

  A pair of left and right side frames consisting of a pair of front and rear longitudinal members and a horizontal member that connects both longitudinal members to the left and right ends of a pair of front and rear floor girders, and a vertical girder and vertical members overlap each other. It is attached to the folding posture folded up so that the posture can be changed, and between the front vertical members and the rear vertical members facing to the left and right of each of the side frames, a stretchable connecting material is bridged, and one end thereof is attached. It is pivotally attached to one opposing vertical member, the other end is removably attached to the other vertical member, and a large pulling material is removably mounted between the upper ends of both side frames. A manhole dropping curing frame in which an attachment member is attached so as to be slidable in the longitudinal direction, and a work rope is attached to the attachment member.   The manhole dropping curing frame according to claim 1, wherein a safety block in which a wire rope is wound so as to be unwound and retractable is attached to the attachment member.   The telescopic binder is composed of a fixed tube and an expandable tube that is telescopically connected to the fixed tube and can be locked at a required expansion / contraction position. The base end of the fixed tube is pivotally attached to one vertical member, The manhole dropping curing frame according to claim 1 or 2, wherein the distal end of the telescopic tube is attached to the other vertical member by a knob bolt.   The expansion and contraction material is such that the base end of the fixed tube is pivotally attached to one vertical member, the distal end of the expansion tube is screwed to the other vertical member by a knob bolt, and the expansion tube is contracted with respect to the fixed tube. 4. The manhole dropping curing frame according to claim 3, wherein the tip end portion is screwed to and stored in the one vertical member with a knob bolt in the state of being made to be.

Images