JP2011214330A - Method of manufacturing ground reinforcing mat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a ground reinforcing mat, which easily manufactures a ground reinforcing mat formed by attaching a number of reinforcing projections side by side on a lying body.SOLUTION: After a form removal spacer 6 is mounted in a small-diameter opening part 5 at the lower end of a form part 4 for forming a number of projections of a manufacturing form A, a hardening binder 2A is injected and filled from an upper opening 3 in the form part 4 for forming a number of projections, the lying body 1 is placed on the manufacturing form A, and the lying body 1 is brought into contact with the hardening binder 2A exposed from the upper opening 3. After the hardening binder 2A is hardened, the manufacturing form A is descended on a placing surface 7, and each form removal spacer 6 is brought into contact with the placing surface 7 to release the respective reinforcing projections 2 together with each form removal spacer 6 upward from the frame part 4 for forming a number of projections.

Description

  The present invention relates to a method for manufacturing a ground reinforcing mat that reinforces and stabilizes the ground.

  The applicants have developed a ground reinforcement mat that reinforces and stabilizes the ground by laying it on the ground, and has filed a patent application (see Patent Document 1 below).

  Briefly describing Patent Document 1, a plurality of reinforcing protrusions having a tapered shape are attached to a laying body that can be laid on the ground so as to protrude downward from the lower surface of the laying body. For example, when this ground reinforcement mat is laid on soft ground, a large number of reinforcing projections are stuck and fixed to the ground, and the numerous reinforcing projections are integrated with the laying body. As a result, tension is generated in the laying body, and a reinforcing effect on the ground surface is brought about.

JP 2009-108660 A

  The present invention provides an epoch-making method for manufacturing a ground reinforcement mat that enables the ground reinforcement mat of Patent Document 1 to be easily manufactured.

  The gist of the present invention will be described with reference to the accompanying drawings.

  A method for manufacturing a ground reinforcing mat, comprising a plurality of reinforcing protrusions 2 having a tapered shape on the laying body 1 that can be laid on the ground so as to protrude downward from the lower surface of the laying body 1 in a juxtaposed manner. In addition, a large number of hollow projecting mold frames 4 having an upper opening 3 and tapering downward are provided in a juxtaposed state, and a small diameter is provided at the lower end of the numerous projecting mold frames 4. A manufacturing form A having an opening 5 is used, and a demounting spacer 6 is detachably attached to the small diameter opening 5 of the manufacturing form A so as to protrude downward from the small diameter opening 5. After that, the hard molding agent 2A is injected and filled from the upper opening 3 into a large number of projection forming mold sections 4 of the manufacturing mold A, and the laying body 1 is mounted on the manufacturing mold A. The laying body 1 is brought into contact with the cured molding agent 2A exposed from the upper opening 3 and the cured molding agent The curing projection 2A is cured by molding the reinforcement projection 2 having a shape that tapers downward in the mold body 4 for projection molding by curing A, and integrating the reinforcement projection 2 and the laying body 1 together. After that, the manufacturing form A is lowered onto the mounting surface 7 such as the ground or the floor, and the respective demolding spacers 6 are brought into contact with the mounting surface 7, whereby the demolding spacers 6 are brought together. The present invention relates to a method for manufacturing a ground reinforcement mat, wherein each of the reinforcing protrusions 2 in a large number of projecting-molding mold parts 4 is demolded upward from the projecting-molding mold parts 4.

  Further, the demolding spacer 6 is formed in a shape in which the diameter of the upper portion thereof is larger than the small diameter opening 5 of the projection forming mold part 4, and the demolding spacer 6 has the small diameter. The opening 5 is configured so that it can be attached to the small-diameter opening 5 while being closed, and when attached to the small-diameter opening 5, the small-diameter opening 5 can be removed upward and removed downward. The ground reinforcing mat manufacturing method according to claim 1, wherein the ground reinforcing mat is configured so as not to be removable.

  The demolding spacer 6 is formed in a conical shape with a tapered lower part, and the diameter of the upper part thereof is set to be larger than the opening diameter of the small-diameter opening 5 of the projection forming mold part 4. Then, when the apex of the lower end of the demolding spacer 6 is inserted into the small diameter opening 5 of the projection forming mold part 4 from above and the apex is protruded downward from the small diameter opening 5, 3. The structure according to claim 1, wherein the demolding spacer 6 is configured to be detachable upward with respect to the small-diameter opening 5, but not detachable downward. This relates to a method for manufacturing a ground reinforcing mat.

  Since the present invention is configured as described above, it is possible to reliably manufacture a ground reinforcing mat in which a laying body and a large number of reinforcing protrusions are integrated in a manufacturing form, and the ground includes a large number of reinforcing protrusions. Reinforcing mats can be quite heavy, but it is possible to reverse the shape of the manufacturing form with the heavy objects (ground reinforcing mats) attached and remove many reinforcing protrusions downward. No troublesome work is required, and a number of mold release spacers are brought into contact with the mounting surface by lowering the manufacturing formwork on the mounting surface such as the ground or the floor, so that a large number of the mold releasing spacers can be provided. Since the reinforced projecting body is removed from the mold for molding the projecting body at once, the groundbreaking ground with extremely excellent practicality, such as the demolding work being carried out very easily and speedily and excellent in mass productivity. This is a method for manufacturing a reinforcing mat.

  In addition, in the inventions of claims 2 and 3, it is possible to easily design and realize a demolding spacer that reliably exhibits the above-mentioned functions and effects, and the demolding spacer allows the projection forming mold part to be formed. Since leakage of the injection-filled cured molding agent can be prevented, it becomes a method for manufacturing a ground reinforcing mat that is more practical, such as being able to reliably form a reinforcing protrusion integrated with a laying body.

It is a perspective view which shows the manufacturing form of a present Example. It is a description partial expansion perspective view which shows the attachment structure of the mold body for a protrusion shaping | molding to the mold body of a present Example. It is the explanatory perspective view which notched a part which shows the mold body part for a protrusion shaping | molding of a present Example. It is an expansion perspective view which shows the demolding spacer of a present Example. It is a partial expanded explanatory sectional view which shows the state which mounted | wore the small diameter opening part of the mold part for protrusion shaping | molding with the demolding spacer of a present Example. It is a partial expansion perspective view which shows the retracting structure of the grounding leg of a present Example. The manufacturing form of the present embodiment is grounded to the mounting surface by the grounding leg, the state of mounting the demolding spacer on the projecting mold forming mold, and the projecting mold forming mold equipped with the demolding spacer It is explanatory side sectional drawing which shows a mode that the hardening molding agent was inject-filled to the part. It is explanatory side sectional drawing which shows a mode that the laying body was laid and mounted on the manufacturing formwork from the state of FIG. It is explanatory side sectional drawing which shows the state which lifted the manufacturing formwork upwards after the hardening molding agent hardening | cured from the state of FIG. FIG. 10 is an explanatory side sectional view showing a state in which the grounding leg is pivoted and retracted upward from the state of FIG. 9. It is explanatory side sectional drawing which shows the state which dropped the manufacturing formwork to the mounting surface from the state of FIG. 10, and removed many reinforcement protrusions. It is a perspective view which shows the ground reinforcement mat completed by the present Example.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  A demolding spacer 6 is detachably attached to the small-diameter openings 5 at the lower ends of a large number of projecting-molding mold sections 4 of the manufacturing mold A so as to protrude downward from the small-diameter openings 5. At this time, it is desirable that the manufacturing form A is brought into a floating state from the mounting surface 7 such as the ground surface or the floor surface by an appropriate means in advance so that the demolding spacer 6 does not contact the mounting surface 7. .

  Subsequently, after the filling molding agent 2A is injected and filled into the large number of projection forming mold sections 4 from the upper opening 3, the laying body 1 that can be laid on the ground is placed on the manufacturing mold A. Then, the laying body 1 is brought into contact with the cured molding agent 2A exposed from the upper opening 3, and the reinforcing projection having a shape in which the lower part is tapered in the projecting mold frame 4 by the curing of the curing molding agent 2A. The body 2 is molded and the reinforcing protrusion 2 and the laying body 1 are integrated.

  After the curing molding agent 2A is cured, the manufacturing mold A is lowered onto the mounting surface 7 such as the ground or the floor, and the demolding spacers 6 are brought into contact with the mounting surface 7.

  As a result, a large number of reinforcing protrusions 2 together with a large number of demolding spacers 6 are demolded from the projecting mold frame 4 at a stroke, and the bottom surface of the laying body 1 is placed on the laying body 1. Thus, the ground reinforcement mat A in which a large number of reinforcing protrusions 2 are juxtaposed so as to protrude downward from the ground is completed.

  Accordingly, such a ground reinforcing mat A is a heavy object only having a large number of reinforcing protrusions 2. According to the present invention, this heavy object (the ground reinforcing mat A) is attached. For example, the manufacturing form A can be simply lifted by a crane and mounted as it is without requiring a troublesome work such that the manufacturing form A is turned upside down and a large number of reinforcing protrusions 2 are removed downward. Since it is possible to remove the mold from the manufacturing form A easily and very quickly by performing a process of lowering on the mounting surface 7, this demolding operation is performed very easily, and the ground reinforcement is easily performed. The mat A can be manufactured and is excellent in mass productivity.

  Further, for example, the demolding spacer 6 is formed in a shape in which the diameter of the upper portion thereof is larger than the small diameter opening 5 of the projecting body forming mold portion 4. The small-diameter opening 5 is configured to be able to be attached to the small-diameter opening 5 while closing the small-diameter opening 5, and when attached to the small-diameter opening 5, the small-diameter opening 5 can be removed upward and downward. If it is configured so that it cannot be removed, the removal spacer 6 closes the small-diameter opening 5 of the projection forming mold frame 4 and is mounted so that it cannot be removed downward. There is no leakage of the hardened molding agent 2A injected and filled into the mold part 4, and the reinforcing projection 2 integrated with the laying body 1 can be reliably molded. Moreover, the demolding spacer 6 is provided with respect to the small-diameter opening 5. Since it can be pulled out upward, it is good when the production form A is lowered onto the mounting surface 7. Made it pulled out upward pushes than reinforcing protruding member 2 protruding member molding form part 4 (to demolding), etc. would become more practical.

  Specific embodiments of the present invention will be described with reference to the drawings.

  In this embodiment, as shown in FIG. 12, a large laying body 1 that can be laid on the ground is provided with a large number of reinforcing protrusions 2 having a tapered shape projecting downward from the lower surface of the laying body 1. The present invention relates to a method for manufacturing a ground reinforcing mat A provided in a juxtaposed state.

  First, the manufacturing form A used in the present embodiment will be described.

  As shown in FIGS. 1 and 2, a mold body 8 having a rectangular frame shape in a plan view is provided with a large number of hollow-shaped projecting molding mold sections 4 having an upper opening 3 and tapered downward. ing.

  The projection forming mold part 4 is formed by press-molding a metal plate so that a connecting collar part 12 is provided on the upper peripheral edge of a hollow conical main part 11 which tapers downward as shown in FIGS. It has a protruding configuration.

  More specifically, the main body portion 11 has a substantially hollow conical shape in which a small range on the upper side forms a hollow cylindrical shape, and a small-diameter opening 5 is formed at a tapered lower end portion.

  Further, the connecting collar 12 having a shape in a plan view is projected from the upper peripheral edge of the main body portion 11, and the stop holes 15 are formed through the four corners (corners) of the connecting collar 12. Yes.

  The projecting mold forming frame portion 4 is attached to the mold body 8 with a space in the longitudinal direction of the longitudinal frame portion 8A between the opposing longitudinal frame portions 8A of the mold body 8. A plurality of angle-shaped mounting bars 16 are installed, and a large number of metal ring bodies 14 are fixed between the mounting bars 16.

  Further, when the lower part of the projection forming mold part 4 is inserted, the ring body 14 is placed in a positioning state with the upper peripheral part substantially in contact with the entire outer peripheral surface of the main part 11. When a metal ring having a different inner diameter is employed, and the projection forming mold part 4 is placed on the ring body 14, the connecting collars 12 of the adjacent projecting mold forming parts 4 are connected to each other. A large number of ring bodies 14 are arranged in the mold body 8 so as to be in a butted state.

  Further, when the projection forming mold part 4 is placed on the ring body 14, the connected part 13 erected from the corner of the connecting collar part 12 is erected from the mounting bar 16 of the mold body 8. By projecting in a state and fixing the fixing flange 12 to the connected portion 13 by using the stop hole 15 and a fastener (not shown), the projecting-molding frame portion 4 is molded. The structure is attached to the frame body 8.

  Therefore, a large number of projecting mold forming sections 4 can be easily placed on the mold main body 8 simply by placing each projecting mold forming mold section 4 on each ring body 14 so as to be inserted one by one. In addition to being able to be positioned and arranged in a juxtaposed state, the projecting body forming mold section 4 can be attached to the mold body 8 simply by connecting (fixing and fixing) the connecting collar section 12 and the connected section 13 that are erected. It is set as the structure which can be attached to many in parallel.

  Further, the large number of projecting mold forming mold parts 4 are arranged such that the small diameter opening part 5 at the lower end is positioned at a height substantially equal to the lower edge of the mold body 8 (all the small diameter opening parts 5 and The height dimension of the projection forming mold part 4 and the position of the connected part 13 are set and configured so that the lower edge of the mold body 8 is on the substantially same plane.

  Further, a demolding spacer 6 that can be detachably mounted so as to protrude downward from the small-diameter opening 5 is provided in the small-diameter opening 5 of the large number of projection forming mold sections 4.

  The demolding spacer 6 of the present embodiment is made of resin and has a conical shape with a tapered lower part, and the lower side thereof corresponds to the lower end side of the small-diameter opening 5 of the projection forming mold part 4. When the demolding spacer 6 is attached to the small-diameter opening 5, the apex at the lower end projects downward from the lower edge of the mold body 8.

  Further, as shown in FIGS. 4 and 5, the demolding spacer 6 is set such that the diameter of the upper portion thereof is larger than the opening diameter of the small-diameter opening 5, and the inclination of the outer peripheral surface of the upper portion. Is set to an inclination equivalent to the inclination of the lower inner peripheral surface of the projecting mold forming part 4, and the apex of the lower end of the demolding spacer 6 is the small diameter opening 5 of the projecting forming mold part 4. When the top is protruded downward from the small-diameter opening 5, the outer peripheral surface of the upper part of the demolding spacer 6 is in contact with the lower inner peripheral surface of the projecting mold part 4 The demolding spacer 6 closes and closes the small-diameter opening 5 so that the demolding spacer 6 can be removed upward from the small-diameter opening 5 and cannot be removed downward. It is composed.

  In addition, the demolding spacer 6 is inserted into the small diameter opening 5 of the projecting mold forming frame 4 from above at the middle of the demolding spacer 6 at the middle in the height direction. A step portion 26 is provided that contacts the inner edge of the small-diameter opening 5 when the apex protrudes downward from the small-diameter opening 5. More specifically, the step portion 26 is formed on a vertical step surface and is provided over the entire outer peripheral surface of the middle portion of the demolding spacer 6 (the demolding spacer 6 is integrally formed in a shape having the step portion 26. In addition, the outer diameter of the step portion 26 is configured to be substantially the same as the opening diameter of the small-diameter opening 5. On the other hand, the opening inner edge of the small-diameter opening 5 is also formed on a vertical surface that is in surface contact with the stepped portion 26.

  Accordingly, when the apex of the lower end of the demolding spacer 6 is inserted into the small-diameter opening 5 of the projection forming mold part 4 from above and the apex protrudes downward from the small-diameter opening 5, the demolding spacer 6 is removed. The entire peripheral surface of the stepped portion 26 of the spacer 6 and the entire peripheral surface of the upper portion above the stepped portion 26 are the entire peripheral surface of the inner edge of the small-diameter opening 5 and the lower part of the projecting mold forming frame 4. The small-diameter opening 5 is effectively closed by being in surface contact with the entire peripheral surface of the inner peripheral surface. Therefore, the molding body 4 for forming the projecting body may be injected and filled with a curing molding agent 2A to form the reinforcing projecting body 2 as will be described later. A very good sealing effect due to the blocking action of the demolding spacer 6 is exhibited, and the cured molding agent 2A does not leak.

  The demolding spacer 6 is finally integrated with the reinforcing protrusion 2 by hardening of the hardening molding agent 2A to become a part (lower end) of the reinforcing protrusion 2, and several portions at the upper part thereof. In the drawing (four locations), inverted L-shaped connection projections 27 are provided so as to be firmly integrated with the reinforcing projections 2 so as to project upward (integral molding).

  Further, a ring portion 28 that is larger in diameter than the opening diameter of the small diameter opening 5 and concentric with the upper surface of the demolding spacer 6 is integrally formed so as to connect the connection protrusions 27. Therefore, even if the demolding spacer 6 is roughly thrown into the projection forming mold part 4 and the demolding spacer 6 rolls over in the projecting mold forming part 4, the ring part 28 has a small diameter opening. By being in contact with the opening edge of 5, it is configured so as to prevent a falling state in which the upper part is down. That is, each connection protrusion 27 does not fall deeper than the small-diameter opening 5 and it becomes difficult to correct the posture of the demolding spacer 6. For example, the demolding spacer 6 is stuck with a stick or the like. The posture of the demolding spacer 6 can be easily corrected by operation.

  The demolding spacer 6 has an upper opening type hollow shape, and the hollow portion 29 is also filled with the curing molding agent 2A so as to be firmly integrated with the reinforcing projection 2.

  In this embodiment, the mold body 8 is grounded on a mounting surface 7 such as the ground, floor or upper surface of a specially designed iron plate, and is removed from the small-diameter opening 5 so as to protrude downward. A grounding leg 9 is provided that floats 6 from the mounting surface 7, and the grounding leg 9 is configured so as to be retractable. By removing the grounding leg 9, demolding that projects downward from the small-diameter opening 5 is performed. The spacer 6 can be brought into contact with the mounting surface 7.

  The grounding leg 9 is provided so as to be rotatable with respect to the mold body 8, and the grounding leg 9 protrudes below the formwork body 8 and comes into contact with the mounting surface 7. The demolding spacer 6 that pivots and retreats upward and protrudes downward from the small-diameter opening 5 is configured to be able to be switched to a retreat state in which the demounting spacer 6 can come into contact with the mounting surface 7.

  More specifically, the grounding leg 9 is configured by attaching a rod-shaped grounding portion 18 to the tip of the rod-shaped rotating portion 17 so as to be orthogonal to the rotating portion 17 as shown in FIG. The base end portion of the rotating portion 17 of the grounding leg 9 is disposed between a pair of left and right bearing plate portions 19 formed to protrude outwardly from the outer peripheral surface of the mold body 8. It is pivotally supported by a pivoting shaft 20 that is erected in a swingable manner.

  Further, the grounding leg 9 is configured such that the rotational movement is restricted by the side surface of the rotating part 17 being in contact with the outer edge of the mold body 8, whereby the rotating part 17 is moved upward from the state in which the rotating part 17 hangs downward. It is configured to be able to turn up and down within a rotation range of about 180 degrees until it stands up.

  In addition, the grounding leg 9 is in a state in which the grounding part 18 projects downward from the lower edge of the mold body 8 and the pivoting part 17 is erected upward when the pivoting part 17 is suspended downward. The total length of the grounding leg 9 is set so that the grounding part 18 protrudes upward from the upper edge of the mold body 8.

  Then, when the grounding leg 9 is pivoted downward (rotating part 17 is hung downward) and the grounding part 18 is projected downward from the lower edge of the mold body 8, the grounding part 18 When the grounding leg 9 is activated and rotated upward (the rotating part 17 is erected upward) from the grounded state, the grounding part 18 is placed on the formwork body 8. The removal spacer 6 that retreats upward from the edge and protrudes downward from the small-diameter opening 5 is configured to be in a retracted state in which it can come into contact with the mounting surface 7.

  Further, holding means 10 is provided for switching and holding the grounding leg 9 between the grounded state and the retracted state.

  The holding means 10 is formed by penetrating through holes 21 at two upper and lower portions on the protruding tip side of each of the pair of left and right bearing plate portions 19, and between the lower left and right pin through holes 21 in the grounding state of the grounding leg 9. When the stopper pin 22 is inserted through the stopper pin 22, the stopper pin 22 prevents the grounding leg 9 (rotating part 17) from starting and rotating so that the grounding state is maintained. When the stopper pin 22 is inserted through, the stopper pin 22 prevents the grounding leg 9 (rotating part 17) from pivoting and maintains the grounding state.

  In the drawing, the grounding legs 9 (the pair of left and right bearing plate portions 19) are arranged at four positions at intervals in the length direction of each longitudinal frame portion 8A of the mold body 8, that is, a total of eight of the mold body 8 The grounding leg 9 is provided in the location.

  In the figure, reference numeral 24 is a connecting portion for connecting the rope 23 and lifting the formwork body 8 upward with a crane, etc., and 25 is a concrete molding vibrator (not shown) attached to the formwork body 8. Are provided at several places on the outer surface portion of each longitudinal frame portion 8A of the mold body 8.

  Next, a method for manufacturing the ground reinforcing mat M of this embodiment using the manufacturing form A will be described.

  In advance, the grounding leg 9 is placed in a grounded state, and the manufacturing form A is placed on the placement surface 7 through the grounding leg 9, and the lower end part is opened from the upper opening 3 of the projecting part forming form part 4. A demolding spacer 6 is inserted into the small-diameter opening 5 so as to protrude downward from the small-diameter opening 5 (see the left side in FIG. 7).

  Subsequently, after a plurality of projection forming mold parts 4 are injected and filled with a hardening molding agent 2A such as concrete from the upper opening 3, a flexible rectangular laying body 1 made of, for example, cloth is manufactured. The laying body 1 is brought into contact with the hardened molding agent 2A that is laid and placed on the mold A (on the connecting collars 12 of the numerous projecting molds 4) and exposed from the upper opening 3. The reinforcing projecting body 2 having a tapered shape is formed in the mold body 4 for projecting the molding by curing the curing molding agent 2A, and the reinforcing projecting body 2 and the laying body 1 are integrated (in FIG. 7). (See right side and Figure 8.)

  When the cured molding agent 2A is cured, the rope 23 is connected to the connecting portion 24 and lifted by a crane or the like (see FIG. 9), and the grounding leg 9 is in a retracted state (see FIG. 10).

  Subsequently, when the manufacturing formwork A is lowered (dropped) on the placement surface 7 with a crane and the release spacers 6 are brought into contact with the placement surface 7, the contact impacts cause the release spacers. 6 is pushed upward, and at the same time, each of the reinforcing projections 2 in the plurality of projection forming mold parts 4 is also pushed upward from the projection forming mold part 4 and demolded. The ground reinforcement mat M as shown is completed.

  It should be noted that, for example, a demolding promoting means such as a material that can be easily demolded by the reinforcing projecting body 2 is used in the manufacturing formwork A for forming the projecting mold forming section 4 or coating the surface. good.

  Note that the present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate.

DESCRIPTION OF SYMBOLS 1 Laying body 2 Reinforcing protrusion 2A Curing molding agent 3 Upper opening part 4 Forming part for projecting body 5 Small diameter opening part 6 Demounting spacer 7 Mounting surface A Manufacturing formwork

Claims (3)

  A method for producing a ground reinforcing mat comprising a laying body laid on the ground, wherein a plurality of reinforcing protrusions having a tapered shape projecting downward from the lower surface of the laying body are attached in parallel. And a plurality of hollow-shaped projecting molds having upper openings and tapered downwards in a juxtaposed state, and having a small-diameter opening at the lower end of the numerous projecting molds After using a mold and detachably attaching a demolding spacer to the small-diameter opening of the manufacturing mold so as to protrude downward from the small-diameter opening, a large number of protrusions of the manufacturing mold are used. A mold forming part for body molding is injected and filled with a hardening molding agent from the upper opening, and the laying body is placed on the mold for manufacturing and placed on the hardening molding agent exposed from the upper opening. The shape where the lower part tapers in the mold part for projecting molding by contact and curing of the curing molding agent After forming the reinforcing projection and integrating the reinforcing projection and the laying body, the curing molding agent is cured, and then the manufacturing formwork is lowered onto a mounting surface such as the ground or floor surface. By bringing each of the mold release spacers into contact with the mounting surface, each of the reinforcing projections in the plurality of projection molding mold parts together with each of the mold release spacers is released above the projection molding mold part. A method for producing a ground reinforcing mat, characterized in that:   The demolding spacer is formed in a shape in which the diameter of the upper part is larger than the small diameter opening of the projection forming mold part, and the demolding spacer closes the small diameter opening. It is configured so that it can be attached to the small-diameter opening, and in such a state that it is attached to the small-diameter opening, it is configured so that it can be removed upward with respect to the small-diameter opening and cannot be removed downward. 2. The method for producing a ground reinforcing mat according to claim 1, wherein   The demolding spacer is formed in a conical shape with a tapered lower part, and the diameter of the upper part thereof is set larger than the opening diameter of the small-diameter opening of the projection forming mold part. When the apex of the lower end of the mold spacer is inserted into the small-diameter opening of the projecting mold frame from above and this apex protrudes downward from the small-diameter opening, the demolding spacer becomes the small-diameter opening. The method for manufacturing a ground reinforcing mat according to any one of claims 1 and 2, characterized in that it can be pulled out upward and cannot be pulled down downward.

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